diff --git a/examples/components/add/package-lock.json b/examples/components/add/package-lock.json index 37e55f7c5..3dc933b26 100644 --- a/examples/components/add/package-lock.json +++ b/examples/components/add/package-lock.json @@ -6,38 +6,38 @@ "": { "name": "add-wasm", "devDependencies": { - "@bytecodealliance/componentize-js": "0.13.0", - "@bytecodealliance/jco": "1.7.0" + "@bytecodealliance/componentize-js": "0.15.0", + "@bytecodealliance/jco": "1.8.1" } }, "node_modules/@bytecodealliance/componentize-js": { - "version": "0.13.0", - "resolved": "https://registry.npmjs.org/@bytecodealliance/componentize-js/-/componentize-js-0.13.0.tgz", - "integrity": "sha512-SBmuSiw2CQTBnmE5+944ujFG9VykovteE2q5XLsTblJgey67TAxrIjlLsygDypFbi2JUGNJJ6t9Y0HSarBgKxQ==", + "version": "0.15.0", + "resolved": "https://registry.npmjs.org/@bytecodealliance/componentize-js/-/componentize-js-0.15.0.tgz", + "integrity": "sha512-NyMsXJi4LxeGGYwmZR5c8Zq69scTgTmaXUOXeC4IDvDoLNz5qZdBqC8gjZnsqvRq69QFM2Hd3Xweb5P5AyEOGA==", "dev": true, "workspaces": [ "." ], "dependencies": { - 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"version": "2.7.0", - "resolved": "https://registry.npmjs.org/tslib/-/tslib-2.7.0.tgz", - "integrity": "sha512-gLXCKdN1/j47AiHiOkJN69hJmcbGTHI0ImLmbYLHykhgeN0jVGola9yVjFgzCUklsZQMW55o+dW7IXv3RCXDzA==", + "version": "2.8.1", + "resolved": "https://registry.npmjs.org/tslib/-/tslib-2.8.1.tgz", + "integrity": "sha512-oJFu94HQb+KVduSUQL7wnpmqnfmLsOA/nAh6b6EH0wCEoK0/mPeXU6c3wKDV83MkOuHPRHtSXKKU99IBazS/2w==", "dev": true, "license": "0BSD", "optional": true diff --git a/examples/components/add/package.json b/examples/components/add/package.json index 041288c8f..46d66933e 100644 --- a/examples/components/add/package.json +++ b/examples/components/add/package.json @@ -9,7 +9,7 @@ "all": "npm run build && npm run transpile && npm run transpiled-js" }, "devDependencies": { - "@bytecodealliance/jco": "1.7.1", - "@bytecodealliance/componentize-js": "0.13.1" + "@bytecodealliance/jco": "1.8.1", + "@bytecodealliance/componentize-js": "0.15.0" } } diff --git a/examples/components/http-hello-world/.gitignore b/examples/components/http-hello-world/.gitignore new file mode 100644 index 000000000..66eb10a5c --- /dev/null +++ b/examples/components/http-hello-world/.gitignore @@ -0,0 +1,4 @@ +node_modules +dist +*.wasm +pnpm-lock.yaml \ No newline at end of file diff --git a/examples/components/http-hello-world/.nvmrc b/examples/components/http-hello-world/.nvmrc new file mode 100644 index 000000000..3d3475a7e --- /dev/null +++ b/examples/components/http-hello-world/.nvmrc @@ -0,0 +1 @@ +v22.5.1 diff --git a/examples/components/http-hello-world/README.md b/examples/components/http-hello-world/README.md new file mode 100644 index 000000000..32e2d2d2d --- /dev/null +++ b/examples/components/http-hello-world/README.md @@ -0,0 +1,153 @@ +# WASI `http-hello-world` in JavaScript + +This folder contains a WebAssembly Javascript component that uses [`wasi:http`][wasi-http] for enabling HTTP handlers in Javascript. + +It uses [`jco`][jco] to: + +- Generate a WebAssembly component (via `jco componentize`) that can be executed by a WebAssembly runtime (ex. [`wasmtime serve`][wasmtime]) + +[nodejs]: https://nodejs.org +[jco]: https://bytecodealliance.github.io/jco/ +[wasi-http]: https://github.com/WebAssembly/wasi-http +[wasmtime]: https://github.com/bytecodealliance/wasmtime + +# Quickstart + +## Dependencies + +First, install required dependencies: + +```console +npm install +``` + +> [!NOTE] +> As this is a regular NodeJS project, you can use your package manager of choice (e.g. `yarn`, `pnpm`) + +At this point, since this project is *just* NodeJS, you could use the module from any NodeJS project or browser project where appropriate. + +That said, we'll be focusing on building the JS code we've written so far into a WebAssembly binary, which can run *anywhere* WebAssembly runtimes are supported, +including in other languages, and the browser. + +## Building the WebAssembly component + +We can build a WebAssembly component binary out of this JS project with `jco`: + +```console +npm run build +``` + +A WebAssembly binary will be written to `string-reverse.wasm`. + +## Serving web requests with the WebAssembly component + +To run the component and serve requests we can either use `jco` or `wasmtime`: + +```console +$ jco serve http-hello-world.wasm +Server listening on 8000... +``` + +> [!WARN] +> `jco serve` is meant to be used for local/development environments, not production use cases. + +Similarly you can also use `wasmtime`: + +``` +$ wasmtime serve -S common http-hello-world.wasm +Serving HTTP on http://0.0.0.0:8080/ +``` + +With either approach, you can use `curl` the appropriate URL to trigger your WebAssembly component. + +> [!NOTE] +> The implementations of `jco serve` and `wasmtime serve` are what actually *fulfill* all the imports +> of your component (see combined/merged `world root` above), and use the `wasi:http/incoming-handler` *export* +> to make web serving actually happen. + +# How it works + +## Exploring this Component WIT + +As WebAssembly components are powered by a [WebAssembly Interface Types ("WIT")][wit]-first workflow, making +a HTTP handler component in WebAssembly requires creating a WIT contract to represent that component. + +This folder contains a `wit` directory (by convention) with the following content in `component.wit`: + +```wit +package example:http-hello-world; + +world component { + export wasi:http/incoming-handler@0.2.0; +} +``` + +> [!NOTE] +> See [`wit/component.wit`](./wit/component.wit) +> +> For more information on the WIT syntax, see [WIT design docs][wit] + +We make use of the [WebAssembly System Interface ("WASI") HTTP][wasi-http] interface here, pulling in +pre-established interfaces interfaces for serving *incoming* HTTP requests. + +[wasi-http]: https://github.com/WebAssembly/wasi-http +[wit]: https://github.com/WebAssembly/component-model/blob/main/design/mvp/WIT.md + +## Resolving references WebAssembly types + +As we intend to use the WASI HTTP interface, we need to pull in WIT interface(s) and types that are referred to by +the `wasi:http/incoming-handler` interface. + +One way fo doing this is *downloading* the WIT from Bytecode Alliance repositories, using [`wkg`, from the `bytecodealliance/wasm-pkg-tools`][wkg]. + +Since WASI is a growing standard, and well integrated we can generally follow the error messages: + +```console +wkg get wasi:http@0.2.2 +wkg get wasi:random@0.2.2 +wkg get wasi:cli@0.2.2 +wkg get wasi:filesystem@0.2.2 +wkg get wasi:sockets@0.2.2 +wkg get wasi:io@0.2.2 +wkg get wasi:clocks@0.2.2 +``` + +> [!NOTE] +> How do we know all these are required? After getting `wasi:http` you can generally follow the error messages. + +This will add many WIT files to your local repository, but you can move/rename all the downloaded `*.wit` files +by making a folder named `deps` under `wit` and dropping them there. + +```console +mkdir wit/deps +mv *.wit wit/deps +``` + +## Building our component + +To turn our JS into a WebAssembly component, we can use `jco componentize`: + +```console +jco componentize http-hello-world.js --wit wit/ --world-name component --out http-hello-world.wasm +``` + +> [!NOTE] +> For ease, you can do all of this with `pnpm build` or `npm run build`, or your npm-compatible build tool of choice. + +You should see output like the following: + +``` +pnpm build + +> http-hello-world-wasm@ build /path/to/jco/examples/components/http-hello-world +> jco componentize http-hello-world.js --wit wit/ --world-name component --out http-hello-world.wasm + +OK Successfully written http-hello-world.wasm. +``` + +Now that your component has been built, we can do *alot* of things to inspect it. Here are a few: + +``` +➜ file http-hello-world.wasm +http-hello-world.wasm: WebAssembly (wasm) binary module version 0x1000d +``` diff --git a/examples/components/http-hello-world/http-hello-world.js b/examples/components/http-hello-world/http-hello-world.js new file mode 100644 index 000000000..433f51efc --- /dev/null +++ b/examples/components/http-hello-world/http-hello-world.js @@ -0,0 +1,51 @@ +/** + * This module is the JS implementation of the `component` WIT world + */ + +import { + IncomingRequest, + ResponseOutparam, + OutgoingBody, + OutgoingResponse, + Fields, +} from 'wasi:http/types@0.2.2'; + +/** + * This export represents the `wasi:http/incoming-handler` interface, + * which describes implementing a HTTP handler in WebAssembly using WASI types. + */ +export const incomingHandler = { + /** + * This Javascript will be turned into a WebAssembly component by `jco` and turned into a + * WebAssembly binary with a single export (this `handler` function). + * + * The exported `handle` method is part of the `wasi:http/incoming-handler` interface, + * which defines how to hadle incoming web requests, turning this component into one that can + * serve web requests. + */ + handle(incomingRequest, responseOutparam) { + // Start building an outgoing response + const outgoingResponse = new OutgoingResponse(new Fields()); + + // Access the outgoing response body + let outgoingBody = outgoingResponse.body(); + { + // Create a stream for the response body + let outputStream = outgoingBody.write(); + // Write hello world to the response stream + outputStream.blockingWriteAndFlush( + new Uint8Array(new TextEncoder().encode('Hello from Javascript!\n')) + ); + // @ts-ignore: This is required in order to dispose the stream before we return + outputStream[Symbol.dispose](); + } + + // Set the status code for the response + outgoingResponse.setStatusCode(200); + // Finish the response body + OutgoingBody.finish(outgoingBody, undefined); + // Set the created response to an "OK" Result value + ResponseOutparam.set(outgoingResponse, { tag: 'ok', val: outgoingResponse }); + } + +}; diff --git a/examples/components/http-hello-world/package-lock.json b/examples/components/http-hello-world/package-lock.json new file mode 100644 index 000000000..10880ebff --- /dev/null +++ b/examples/components/http-hello-world/package-lock.json @@ -0,0 +1,1618 @@ +{ + "name": "reverser-wasm", + "lockfileVersion": 3, + "requires": true, + "packages": { + "": { + "name": "reverser-wasm", + "devDependencies": { + "@bytecodealliance/componentize-js": "0.13.0", + "@bytecodealliance/jco": "1.7.0" + } + }, + "node_modules/@bytecodealliance/componentize-js": { + "version": "0.13.0", + "resolved": "https://registry.npmjs.org/@bytecodealliance/componentize-js/-/componentize-js-0.13.0.tgz", + "integrity": "sha512-SBmuSiw2CQTBnmE5+944ujFG9VykovteE2q5XLsTblJgey67TAxrIjlLsygDypFbi2JUGNJJ6t9Y0HSarBgKxQ==", + "dev": true, + "workspaces": [ + "." + ], + "dependencies": { + 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"0.15.0" + } +} diff --git a/examples/components/http-hello-world/types/interfaces/wasi-clocks-monotonic-clock.d.ts b/examples/components/http-hello-world/types/interfaces/wasi-clocks-monotonic-clock.d.ts new file mode 100644 index 000000000..8d6622ba7 --- /dev/null +++ b/examples/components/http-hello-world/types/interfaces/wasi-clocks-monotonic-clock.d.ts @@ -0,0 +1,37 @@ +export namespace WasiClocksMonotonicClock { + /** + * Read the current value of the clock. + * + * The clock is monotonic, therefore calling this function repeatedly will + * produce a sequence of non-decreasing values. + */ + export function now(): Instant; + /** + * Query the resolution of the clock. Returns the duration of time + * corresponding to a clock tick. + */ + export function resolution(): Duration; + /** + * Create a `pollable` which will resolve once the specified instant + * occured. + */ + export function subscribeInstant(when: Instant): Pollable; + /** + * Create a `pollable` which will resolve once the given duration has + * elapsed, starting at the time at which this function was called. + * occured. + */ + export function subscribeDuration(when: Duration): Pollable; +} +import type { Pollable } from './wasi-io-poll.js'; +export { Pollable }; +/** + * An instant in time, in nanoseconds. An instant is relative to an + * unspecified initial value, and can only be compared to instances from + * the same monotonic-clock. + */ +export type Instant = bigint; +/** + * A duration of time, in nanoseconds. + */ +export type Duration = bigint; diff --git a/examples/components/http-hello-world/types/interfaces/wasi-http-incoming-handler.d.ts b/examples/components/http-hello-world/types/interfaces/wasi-http-incoming-handler.d.ts new file mode 100644 index 000000000..cd927f7d3 --- /dev/null +++ b/examples/components/http-hello-world/types/interfaces/wasi-http-incoming-handler.d.ts @@ -0,0 +1,19 @@ +export namespace WasiHttpIncomingHandler { + /** + * This function is invoked with an incoming HTTP Request, and a resource + * `response-outparam` which provides the capability to reply with an HTTP + * Response. The response is sent by calling the `response-outparam.set` + * method, which allows execution to continue after the response has been + * sent. This enables both streaming to the response body, and performing other + * work. + * + * The implementor of this function must write a response to the + * `response-outparam` before returning, or else the caller will respond + * with an error on its behalf. + */ + export function handle(request: IncomingRequest, responseOut: ResponseOutparam): void; +} +import type { IncomingRequest } from './wasi-http-types.js'; +export { IncomingRequest }; +import type { ResponseOutparam } from './wasi-http-types.js'; +export { ResponseOutparam }; diff --git a/examples/components/http-hello-world/types/interfaces/wasi-http-types.d.ts b/examples/components/http-hello-world/types/interfaces/wasi-http-types.d.ts new file mode 100644 index 000000000..f2afd4bb3 --- /dev/null +++ b/examples/components/http-hello-world/types/interfaces/wasi-http-types.d.ts @@ -0,0 +1,713 @@ +export namespace WasiHttpTypes { + export { Fields }; + export { IncomingRequest }; + export { OutgoingRequest }; + export { RequestOptions }; + export { ResponseOutparam }; + export { IncomingResponse }; + export { IncomingBody }; + export { FutureTrailers }; + export { OutgoingResponse }; + export { OutgoingBody }; + export { FutureIncomingResponse }; + /** + * Attempts to extract a http-related `error` from the wasi:io `error` + * provided. + * + * Stream operations which return + * `wasi:io/stream/stream-error::last-operation-failed` have a payload of + * type `wasi:io/error/error` with more information about the operation + * that failed. This payload can be passed through to this function to see + * if there's http-related information about the error to return. + * + * Note that this function is fallible because not all io-errors are + * http-related errors. + */ + export function httpErrorCode(err: IoError): ErrorCode | undefined; +} +import type { Duration } from './wasi-clocks-monotonic-clock.js'; +export { Duration }; +import type { InputStream } from './wasi-io-streams.js'; +export { InputStream }; +import type { OutputStream } from './wasi-io-streams.js'; +export { OutputStream }; +import type { Error as IoError } from './wasi-io-error.js'; +export { IoError }; +import type { Pollable } from './wasi-io-poll.js'; +export { Pollable }; +/** + * This type corresponds to HTTP standard Methods. + */ +export type Method = MethodGet | MethodHead | MethodPost | MethodPut | MethodDelete | MethodConnect | MethodOptions | MethodTrace | MethodPatch | MethodOther; +export interface MethodGet { + tag: 'get', +} +export interface MethodHead { + tag: 'head', +} +export interface MethodPost { + tag: 'post', +} +export interface MethodPut { + tag: 'put', +} +export interface MethodDelete { + tag: 'delete', +} +export interface MethodConnect { + tag: 'connect', +} +export interface MethodOptions { + tag: 'options', +} +export interface MethodTrace { + tag: 'trace', +} +export interface MethodPatch { + tag: 'patch', +} +export interface MethodOther { + tag: 'other', + val: string, +} +/** + * This type corresponds to HTTP standard Related Schemes. + */ +export type Scheme = SchemeHttp | SchemeHttps | SchemeOther; +export interface SchemeHttp { + tag: 'HTTP', +} +export interface SchemeHttps { + tag: 'HTTPS', +} +export interface SchemeOther { + tag: 'other', + val: string, +} +/** + * Defines the case payload type for `DNS-error` above: + */ +export interface DnsErrorPayload { + rcode?: string, + infoCode?: number, +} +/** + * Defines the case payload type for `TLS-alert-received` above: + */ +export interface TlsAlertReceivedPayload { + alertId?: number, + alertMessage?: string, +} +/** + * Defines the case payload type for `HTTP-response-{header,trailer}-size` above: + */ +export interface FieldSizePayload { + fieldName?: string, + fieldSize?: number, +} +/** + * These cases are inspired by the IANA HTTP Proxy Error Types: + * https://www.iana.org/assignments/http-proxy-status/http-proxy-status.xhtml#table-http-proxy-error-types + */ +export type ErrorCode = ErrorCodeDnsTimeout | ErrorCodeDnsError | ErrorCodeDestinationNotFound | ErrorCodeDestinationUnavailable | ErrorCodeDestinationIpProhibited | ErrorCodeDestinationIpUnroutable | ErrorCodeConnectionRefused | ErrorCodeConnectionTerminated | ErrorCodeConnectionTimeout | ErrorCodeConnectionReadTimeout | ErrorCodeConnectionWriteTimeout | ErrorCodeConnectionLimitReached | ErrorCodeTlsProtocolError | ErrorCodeTlsCertificateError | ErrorCodeTlsAlertReceived | ErrorCodeHttpRequestDenied | ErrorCodeHttpRequestLengthRequired | ErrorCodeHttpRequestBodySize | ErrorCodeHttpRequestMethodInvalid | ErrorCodeHttpRequestUriInvalid | ErrorCodeHttpRequestUriTooLong | ErrorCodeHttpRequestHeaderSectionSize | ErrorCodeHttpRequestHeaderSize | ErrorCodeHttpRequestTrailerSectionSize | ErrorCodeHttpRequestTrailerSize | ErrorCodeHttpResponseIncomplete | ErrorCodeHttpResponseHeaderSectionSize | ErrorCodeHttpResponseHeaderSize | ErrorCodeHttpResponseBodySize | ErrorCodeHttpResponseTrailerSectionSize | ErrorCodeHttpResponseTrailerSize | ErrorCodeHttpResponseTransferCoding | ErrorCodeHttpResponseContentCoding | ErrorCodeHttpResponseTimeout | ErrorCodeHttpUpgradeFailed | ErrorCodeHttpProtocolError | ErrorCodeLoopDetected | ErrorCodeConfigurationError | ErrorCodeInternalError; +export interface ErrorCodeDnsTimeout { + tag: 'DNS-timeout', +} +export interface ErrorCodeDnsError { + tag: 'DNS-error', + val: DnsErrorPayload, +} +export interface ErrorCodeDestinationNotFound { + tag: 'destination-not-found', +} +export interface ErrorCodeDestinationUnavailable { + tag: 'destination-unavailable', +} +export interface ErrorCodeDestinationIpProhibited { + tag: 'destination-IP-prohibited', +} +export interface ErrorCodeDestinationIpUnroutable { + tag: 'destination-IP-unroutable', +} +export interface ErrorCodeConnectionRefused { + tag: 'connection-refused', +} +export interface ErrorCodeConnectionTerminated { + tag: 'connection-terminated', +} +export interface ErrorCodeConnectionTimeout { + tag: 'connection-timeout', +} +export interface ErrorCodeConnectionReadTimeout { + tag: 'connection-read-timeout', +} +export interface ErrorCodeConnectionWriteTimeout { + tag: 'connection-write-timeout', +} +export interface ErrorCodeConnectionLimitReached { + tag: 'connection-limit-reached', +} +export interface ErrorCodeTlsProtocolError { + tag: 'TLS-protocol-error', +} +export interface ErrorCodeTlsCertificateError { + tag: 'TLS-certificate-error', +} +export interface ErrorCodeTlsAlertReceived { + tag: 'TLS-alert-received', + val: TlsAlertReceivedPayload, +} +export interface ErrorCodeHttpRequestDenied { + tag: 'HTTP-request-denied', +} +export interface ErrorCodeHttpRequestLengthRequired { + tag: 'HTTP-request-length-required', +} +export interface ErrorCodeHttpRequestBodySize { + tag: 'HTTP-request-body-size', + val: bigint | undefined, +} +export interface ErrorCodeHttpRequestMethodInvalid { + tag: 'HTTP-request-method-invalid', +} +export interface ErrorCodeHttpRequestUriInvalid { + tag: 'HTTP-request-URI-invalid', +} +export interface ErrorCodeHttpRequestUriTooLong { + tag: 'HTTP-request-URI-too-long', +} +export interface ErrorCodeHttpRequestHeaderSectionSize { + tag: 'HTTP-request-header-section-size', + val: number | undefined, +} +export interface ErrorCodeHttpRequestHeaderSize { + tag: 'HTTP-request-header-size', + val: FieldSizePayload | undefined, +} +export interface ErrorCodeHttpRequestTrailerSectionSize { + tag: 'HTTP-request-trailer-section-size', + val: number | undefined, +} +export interface ErrorCodeHttpRequestTrailerSize { + tag: 'HTTP-request-trailer-size', + val: FieldSizePayload, +} +export interface ErrorCodeHttpResponseIncomplete { + tag: 'HTTP-response-incomplete', +} +export interface ErrorCodeHttpResponseHeaderSectionSize { + tag: 'HTTP-response-header-section-size', + val: number | undefined, +} +export interface ErrorCodeHttpResponseHeaderSize { + tag: 'HTTP-response-header-size', + val: FieldSizePayload, +} +export interface ErrorCodeHttpResponseBodySize { + tag: 'HTTP-response-body-size', + val: bigint | undefined, +} +export interface ErrorCodeHttpResponseTrailerSectionSize { + tag: 'HTTP-response-trailer-section-size', + val: number | undefined, +} +export interface ErrorCodeHttpResponseTrailerSize { + tag: 'HTTP-response-trailer-size', + val: FieldSizePayload, +} +export interface ErrorCodeHttpResponseTransferCoding { + tag: 'HTTP-response-transfer-coding', + val: string | undefined, +} +export interface ErrorCodeHttpResponseContentCoding { + tag: 'HTTP-response-content-coding', + val: string | undefined, +} +export interface ErrorCodeHttpResponseTimeout { + tag: 'HTTP-response-timeout', +} +export interface ErrorCodeHttpUpgradeFailed { + tag: 'HTTP-upgrade-failed', +} +export interface ErrorCodeHttpProtocolError { + tag: 'HTTP-protocol-error', +} +export interface ErrorCodeLoopDetected { + tag: 'loop-detected', +} +export interface ErrorCodeConfigurationError { + tag: 'configuration-error', +} +/** + * This is a catch-all error for anything that doesn't fit cleanly into a + * more specific case. It also includes an optional string for an + * unstructured description of the error. Users should not depend on the + * string for diagnosing errors, as it's not required to be consistent + * between implementations. + */ +export interface ErrorCodeInternalError { + tag: 'internal-error', + val: string | undefined, +} +/** + * This type enumerates the different kinds of errors that may occur when + * setting or appending to a `fields` resource. + */ +export type HeaderError = HeaderErrorInvalidSyntax | HeaderErrorForbidden | HeaderErrorImmutable; +/** + * This error indicates that a `field-key` or `field-value` was + * syntactically invalid when used with an operation that sets headers in a + * `fields`. + */ +export interface HeaderErrorInvalidSyntax { + tag: 'invalid-syntax', +} +/** + * This error indicates that a forbidden `field-key` was used when trying + * to set a header in a `fields`. + */ +export interface HeaderErrorForbidden { + tag: 'forbidden', +} +/** + * This error indicates that the operation on the `fields` was not + * permitted because the fields are immutable. + */ +export interface HeaderErrorImmutable { + tag: 'immutable', +} +/** + * Field keys are always strings. + */ +export type FieldKey = string; +/** + * Field values should always be ASCII strings. However, in + * reality, HTTP implementations often have to interpret malformed values, + * so they are provided as a list of bytes. + */ +export type FieldValue = Uint8Array; +/** + * Headers is an alias for Fields. + */ +export type Headers = Fields; +/** + * Trailers is an alias for Fields. + */ +export type Trailers = Fields; +/** + * This type corresponds to the HTTP standard Status Code. + */ +export type StatusCode = number; +export type Result = { tag: 'ok', val: T } | { tag: 'err', val: E }; + +export class Fields { + /** + * Construct an empty HTTP Fields. + * + * The resulting `fields` is mutable. + */ + constructor() + /** + * Construct an HTTP Fields. + * + * The resulting `fields` is mutable. + * + * The list represents each key-value pair in the Fields. Keys + * which have multiple values are represented by multiple entries in this + * list with the same key. + * + * The tuple is a pair of the field key, represented as a string, and + * Value, represented as a list of bytes. In a valid Fields, all keys + * and values are valid UTF-8 strings. However, values are not always + * well-formed, so they are represented as a raw list of bytes. + * + * An error result will be returned if any header or value was + * syntactically invalid, or if a header was forbidden. + */ + static fromList(entries: Array<[FieldKey, FieldValue]>): Fields; + /** + * Get all of the values corresponding to a key. If the key is not present + * in this `fields`, an empty list is returned. However, if the key is + * present but empty, this is represented by a list with one or more + * empty field-values present. + */ + get(name: FieldKey): Array; + /** + * Returns `true` when the key is present in this `fields`. If the key is + * syntactically invalid, `false` is returned. + */ + has(name: FieldKey): boolean; + /** + * Set all of the values for a key. Clears any existing values for that + * key, if they have been set. + * + * Fails with `header-error.immutable` if the `fields` are immutable. + */ + set(name: FieldKey, value: Array): void; + /** + * Delete all values for a key. Does nothing if no values for the key + * exist. + * + * Fails with `header-error.immutable` if the `fields` are immutable. + */ + 'delete'(name: FieldKey): void; + /** + * Append a value for a key. Does not change or delete any existing + * values for that key. + * + * Fails with `header-error.immutable` if the `fields` are immutable. + */ + append(name: FieldKey, value: FieldValue): void; + /** + * Retrieve the full set of keys and values in the Fields. Like the + * constructor, the list represents each key-value pair. + * + * The outer list represents each key-value pair in the Fields. Keys + * which have multiple values are represented by multiple entries in this + * list with the same key. + */ + entries(): Array<[FieldKey, FieldValue]>; + /** + * Make a deep copy of the Fields. Equivelant in behavior to calling the + * `fields` constructor on the return value of `entries`. The resulting + * `fields` is mutable. + */ + clone(): Fields; +} + +export class FutureIncomingResponse { + /** + * Returns a pollable which becomes ready when either the Response has + * been received, or an error has occured. When this pollable is ready, + * the `get` method will return `some`. + */ + subscribe(): Pollable; + /** + * Returns the incoming HTTP Response, or an error, once one is ready. + * + * The outer `option` represents future readiness. Users can wait on this + * `option` to become `some` using the `subscribe` method. + * + * The outer `result` is used to retrieve the response or error at most + * once. It will be success on the first call in which the outer option + * is `some`, and error on subsequent calls. + * + * The inner `result` represents that either the incoming HTTP Response + * status and headers have recieved successfully, or that an error + * occured. Errors may also occur while consuming the response body, + * but those will be reported by the `incoming-body` and its + * `output-stream` child. + */ + get(): Result, void> | undefined; +} + +export class FutureTrailers { + /** + * Returns a pollable which becomes ready when either the trailers have + * been received, or an error has occured. When this pollable is ready, + * the `get` method will return `some`. + */ + subscribe(): Pollable; + /** + * Returns the contents of the trailers, or an error which occured, + * once the future is ready. + * + * The outer `option` represents future readiness. Users can wait on this + * `option` to become `some` using the `subscribe` method. + * + * The outer `result` is used to retrieve the trailers or error at most + * once. It will be success on the first call in which the outer option + * is `some`, and error on subsequent calls. + * + * The inner `result` represents that either the HTTP Request or Response + * body, as well as any trailers, were received successfully, or that an + * error occured receiving them. The optional `trailers` indicates whether + * or not trailers were present in the body. + * + * When some `trailers` are returned by this method, the `trailers` + * resource is immutable, and a child. Use of the `set`, `append`, or + * `delete` methods will return an error, and the resource must be + * dropped before the parent `future-trailers` is dropped. + */ + get(): Result, void> | undefined; +} + +export class IncomingBody { + /** + * Returns the contents of the body, as a stream of bytes. + * + * Returns success on first call: the stream representing the contents + * can be retrieved at most once. Subsequent calls will return error. + * + * The returned `input-stream` resource is a child: it must be dropped + * before the parent `incoming-body` is dropped, or consumed by + * `incoming-body.finish`. + * + * This invariant ensures that the implementation can determine whether + * the user is consuming the contents of the body, waiting on the + * `future-trailers` to be ready, or neither. This allows for network + * backpressure is to be applied when the user is consuming the body, + * and for that backpressure to not inhibit delivery of the trailers if + * the user does not read the entire body. + */ + stream(): InputStream; + /** + * Takes ownership of `incoming-body`, and returns a `future-trailers`. + * This function will trap if the `input-stream` child is still alive. + */ + static finish(this_: IncomingBody): FutureTrailers; +} + +export class IncomingRequest { + /** + * Returns the method of the incoming request. + */ + method(): Method; + /** + * Returns the path with query parameters from the request, as a string. + */ + pathWithQuery(): string | undefined; + /** + * Returns the protocol scheme from the request. + */ + scheme(): Scheme | undefined; + /** + * Returns the authority from the request, if it was present. + */ + authority(): string | undefined; + /** + * Get the `headers` associated with the request. + * + * The returned `headers` resource is immutable: `set`, `append`, and + * `delete` operations will fail with `header-error.immutable`. + * + * The `headers` returned are a child resource: it must be dropped before + * the parent `incoming-request` is dropped. Dropping this + * `incoming-request` before all children are dropped will trap. + */ + headers(): Headers; + /** + * Gives the `incoming-body` associated with this request. Will only + * return success at most once, and subsequent calls will return error. + */ + consume(): IncomingBody; +} + +export class IncomingResponse { + /** + * Returns the status code from the incoming response. + */ + status(): StatusCode; + /** + * Returns the headers from the incoming response. + * + * The returned `headers` resource is immutable: `set`, `append`, and + * `delete` operations will fail with `header-error.immutable`. + * + * This headers resource is a child: it must be dropped before the parent + * `incoming-response` is dropped. + */ + headers(): Headers; + /** + * Returns the incoming body. May be called at most once. Returns error + * if called additional times. + */ + consume(): IncomingBody; +} + +export class OutgoingBody { + /** + * Returns a stream for writing the body contents. + * + * The returned `output-stream` is a child resource: it must be dropped + * before the parent `outgoing-body` resource is dropped (or finished), + * otherwise the `outgoing-body` drop or `finish` will trap. + * + * Returns success on the first call: the `output-stream` resource for + * this `outgoing-body` may be retrieved at most once. Subsequent calls + * will return error. + */ + write(): OutputStream; + /** + * Finalize an outgoing body, optionally providing trailers. This must be + * called to signal that the response is complete. If the `outgoing-body` + * is dropped without calling `outgoing-body.finalize`, the implementation + * should treat the body as corrupted. + * + * Fails if the body's `outgoing-request` or `outgoing-response` was + * constructed with a Content-Length header, and the contents written + * to the body (via `write`) does not match the value given in the + * Content-Length. + */ + static finish(this_: OutgoingBody, trailers: Trailers | undefined): void; +} + +export class OutgoingRequest { + /** + * Construct a new `outgoing-request` with a default `method` of `GET`, and + * `none` values for `path-with-query`, `scheme`, and `authority`. + * + * * `headers` is the HTTP Headers for the Request. + * + * It is possible to construct, or manipulate with the accessor functions + * below, an `outgoing-request` with an invalid combination of `scheme` + * and `authority`, or `headers` which are not permitted to be sent. + * It is the obligation of the `outgoing-handler.handle` implementation + * to reject invalid constructions of `outgoing-request`. + */ + constructor(headers: Headers) + /** + * Returns the resource corresponding to the outgoing Body for this + * Request. + * + * Returns success on the first call: the `outgoing-body` resource for + * this `outgoing-request` can be retrieved at most once. Subsequent + * calls will return error. + */ + body(): OutgoingBody; + /** + * Get the Method for the Request. + */ + method(): Method; + /** + * Set the Method for the Request. Fails if the string present in a + * `method.other` argument is not a syntactically valid method. + */ + setMethod(method: Method): void; + /** + * Get the combination of the HTTP Path and Query for the Request. + * When `none`, this represents an empty Path and empty Query. + */ + pathWithQuery(): string | undefined; + /** + * Set the combination of the HTTP Path and Query for the Request. + * When `none`, this represents an empty Path and empty Query. Fails is the + * string given is not a syntactically valid path and query uri component. + */ + setPathWithQuery(pathWithQuery: string | undefined): void; + /** + * Get the HTTP Related Scheme for the Request. When `none`, the + * implementation may choose an appropriate default scheme. + */ + scheme(): Scheme | undefined; + /** + * Set the HTTP Related Scheme for the Request. When `none`, the + * implementation may choose an appropriate default scheme. Fails if the + * string given is not a syntactically valid uri scheme. + */ + setScheme(scheme: Scheme | undefined): void; + /** + * Get the HTTP Authority for the Request. A value of `none` may be used + * with Related Schemes which do not require an Authority. The HTTP and + * HTTPS schemes always require an authority. + */ + authority(): string | undefined; + /** + * Set the HTTP Authority for the Request. A value of `none` may be used + * with Related Schemes which do not require an Authority. The HTTP and + * HTTPS schemes always require an authority. Fails if the string given is + * not a syntactically valid uri authority. + */ + setAuthority(authority: string | undefined): void; + /** + * Get the headers associated with the Request. + * + * The returned `headers` resource is immutable: `set`, `append`, and + * `delete` operations will fail with `header-error.immutable`. + * + * This headers resource is a child: it must be dropped before the parent + * `outgoing-request` is dropped, or its ownership is transfered to + * another component by e.g. `outgoing-handler.handle`. + */ + headers(): Headers; +} + +export class OutgoingResponse { + /** + * Construct an `outgoing-response`, with a default `status-code` of `200`. + * If a different `status-code` is needed, it must be set via the + * `set-status-code` method. + * + * * `headers` is the HTTP Headers for the Response. + */ + constructor(headers: Headers) + /** + * Get the HTTP Status Code for the Response. + */ + statusCode(): StatusCode; + /** + * Set the HTTP Status Code for the Response. Fails if the status-code + * given is not a valid http status code. + */ + setStatusCode(statusCode: StatusCode): void; + /** + * Get the headers associated with the Request. + * + * The returned `headers` resource is immutable: `set`, `append`, and + * `delete` operations will fail with `header-error.immutable`. + * + * This headers resource is a child: it must be dropped before the parent + * `outgoing-request` is dropped, or its ownership is transfered to + * another component by e.g. `outgoing-handler.handle`. + */ + headers(): Headers; + /** + * Returns the resource corresponding to the outgoing Body for this Response. + * + * Returns success on the first call: the `outgoing-body` resource for + * this `outgoing-response` can be retrieved at most once. Subsequent + * calls will return error. + */ + body(): OutgoingBody; +} + +export class RequestOptions { + /** + * Construct a default `request-options` value. + */ + constructor() + /** + * The timeout for the initial connect to the HTTP Server. + */ + connectTimeout(): Duration | undefined; + /** + * Set the timeout for the initial connect to the HTTP Server. An error + * return value indicates that this timeout is not supported. + */ + setConnectTimeout(duration: Duration | undefined): void; + /** + * The timeout for receiving the first byte of the Response body. + */ + firstByteTimeout(): Duration | undefined; + /** + * Set the timeout for receiving the first byte of the Response body. An + * error return value indicates that this timeout is not supported. + */ + setFirstByteTimeout(duration: Duration | undefined): void; + /** + * The timeout for receiving subsequent chunks of bytes in the Response + * body stream. + */ + betweenBytesTimeout(): Duration | undefined; + /** + * Set the timeout for receiving subsequent chunks of bytes in the Response + * body stream. An error return value indicates that this timeout is not + * supported. + */ + setBetweenBytesTimeout(duration: Duration | undefined): void; +} + +export class ResponseOutparam { + /** + * Set the value of the `response-outparam` to either send a response, + * or indicate an error. + * + * This method consumes the `response-outparam` to ensure that it is + * called at most once. If it is never called, the implementation + * will respond with an error. + * + * The user may provide an `error` to `response` to allow the + * implementation determine how to respond with an HTTP error response. + */ + static set(param: ResponseOutparam, response: Result): void; +} diff --git a/examples/components/http-hello-world/types/interfaces/wasi-io-error.d.ts b/examples/components/http-hello-world/types/interfaces/wasi-io-error.d.ts new file mode 100644 index 000000000..e0dbb1c22 --- /dev/null +++ b/examples/components/http-hello-world/types/interfaces/wasi-io-error.d.ts @@ -0,0 +1,16 @@ +export namespace WasiIoError { + export { Error }; +} + +export class Error { + /** + * Returns a string that is suitable to assist humans in debugging + * this error. + * + * WARNING: The returned string should not be consumed mechanically! + * It may change across platforms, hosts, or other implementation + * details. Parsing this string is a major platform-compatibility + * hazard. + */ + toDebugString(): string; +} diff --git a/examples/components/http-hello-world/types/interfaces/wasi-io-poll.d.ts b/examples/components/http-hello-world/types/interfaces/wasi-io-poll.d.ts new file mode 100644 index 000000000..78a569d73 --- /dev/null +++ b/examples/components/http-hello-world/types/interfaces/wasi-io-poll.d.ts @@ -0,0 +1,41 @@ +export namespace WasiIoPoll { + export { Pollable }; + /** + * Poll for completion on a set of pollables. + * + * This function takes a list of pollables, which identify I/O sources of + * interest, and waits until one or more of the events is ready for I/O. + * + * The result `list` contains one or more indices of handles in the + * argument list that is ready for I/O. + * + * If the list contains more elements than can be indexed with a `u32` + * value, this function traps. + * + * A timeout can be implemented by adding a pollable from the + * wasi-clocks API to the list. + * + * This function does not return a `result`; polling in itself does not + * do any I/O so it doesn't fail. If any of the I/O sources identified by + * the pollables has an error, it is indicated by marking the source as + * being reaedy for I/O. + */ + export function poll(in_: Array): Uint32Array; +} + +export class Pollable { + /** + * Return the readiness of a pollable. This function never blocks. + * + * Returns `true` when the pollable is ready, and `false` otherwise. + */ + ready(): boolean; + /** + * `block` returns immediately if the pollable is ready, and otherwise + * blocks until ready. + * + * This function is equivalent to calling `poll.poll` on a list + * containing only this pollable. + */ + block(): void; +} diff --git a/examples/components/http-hello-world/types/interfaces/wasi-io-streams.d.ts b/examples/components/http-hello-world/types/interfaces/wasi-io-streams.d.ts new file mode 100644 index 000000000..46500e742 --- /dev/null +++ b/examples/components/http-hello-world/types/interfaces/wasi-io-streams.d.ts @@ -0,0 +1,237 @@ +export namespace WasiIoStreams { + export { InputStream }; + export { OutputStream }; +} +import type { Error } from './wasi-io-error.js'; +export { Error }; +import type { Pollable } from './wasi-io-poll.js'; +export { Pollable }; +/** + * An error for input-stream and output-stream operations. + */ +export type StreamError = StreamErrorLastOperationFailed | StreamErrorClosed; +/** + * The last operation (a write or flush) failed before completion. + * + * More information is available in the `error` payload. + */ +export interface StreamErrorLastOperationFailed { + tag: 'last-operation-failed', + val: Error, +} +/** + * The stream is closed: no more input will be accepted by the + * stream. A closed output-stream will return this error on all + * future operations. + */ +export interface StreamErrorClosed { + tag: 'closed', +} + +export class InputStream { + /** + * Perform a non-blocking read from the stream. + * + * When the source of a `read` is binary data, the bytes from the source + * are returned verbatim. When the source of a `read` is known to the + * implementation to be text, bytes containing the UTF-8 encoding of the + * text are returned. + * + * This function returns a list of bytes containing the read data, + * when successful. The returned list will contain up to `len` bytes; + * it may return fewer than requested, but not more. The list is + * empty when no bytes are available for reading at this time. The + * pollable given by `subscribe` will be ready when more bytes are + * available. + * + * This function fails with a `stream-error` when the operation + * encounters an error, giving `last-operation-failed`, or when the + * stream is closed, giving `closed`. + * + * When the caller gives a `len` of 0, it represents a request to + * read 0 bytes. If the stream is still open, this call should + * succeed and return an empty list, or otherwise fail with `closed`. + * + * The `len` parameter is a `u64`, which could represent a list of u8 which + * is not possible to allocate in wasm32, or not desirable to allocate as + * as a return value by the callee. The callee may return a list of bytes + * less than `len` in size while more bytes are available for reading. + */ + read(len: bigint): Uint8Array; + /** + * Read bytes from a stream, after blocking until at least one byte can + * be read. Except for blocking, behavior is identical to `read`. + */ + blockingRead(len: bigint): Uint8Array; + /** + * Skip bytes from a stream. Returns number of bytes skipped. + * + * Behaves identical to `read`, except instead of returning a list + * of bytes, returns the number of bytes consumed from the stream. + */ + skip(len: bigint): bigint; + /** + * Skip bytes from a stream, after blocking until at least one byte + * can be skipped. Except for blocking behavior, identical to `skip`. + */ + blockingSkip(len: bigint): bigint; + /** + * Create a `pollable` which will resolve once either the specified stream + * has bytes available to read or the other end of the stream has been + * closed. + * The created `pollable` is a child resource of the `input-stream`. + * Implementations may trap if the `input-stream` is dropped before + * all derived `pollable`s created with this function are dropped. + */ + subscribe(): Pollable; +} + +export class OutputStream { + /** + * Check readiness for writing. This function never blocks. + * + * Returns the number of bytes permitted for the next call to `write`, + * or an error. Calling `write` with more bytes than this function has + * permitted will trap. + * + * When this function returns 0 bytes, the `subscribe` pollable will + * become ready when this function will report at least 1 byte, or an + * error. + */ + checkWrite(): bigint; + /** + * Perform a write. This function never blocks. + * + * When the destination of a `write` is binary data, the bytes from + * `contents` are written verbatim. When the destination of a `write` is + * known to the implementation to be text, the bytes of `contents` are + * transcoded from UTF-8 into the encoding of the destination and then + * written. + * + * Precondition: check-write gave permit of Ok(n) and contents has a + * length of less than or equal to n. Otherwise, this function will trap. + * + * returns Err(closed) without writing if the stream has closed since + * the last call to check-write provided a permit. + */ + write(contents: Uint8Array): void; + /** + * Perform a write of up to 4096 bytes, and then flush the stream. Block + * until all of these operations are complete, or an error occurs. + * + * This is a convenience wrapper around the use of `check-write`, + * `subscribe`, `write`, and `flush`, and is implemented with the + * following pseudo-code: + * + * ```text + * let pollable = this.subscribe(); + * while !contents.is_empty() { + * // Wait for the stream to become writable + * pollable.block(); + * let Ok(n) = this.check-write(); // eliding error handling + * let len = min(n, contents.len()); + * let (chunk, rest) = contents.split_at(len); + * this.write(chunk ); // eliding error handling + * contents = rest; + * } + * this.flush(); + * // Wait for completion of `flush` + * pollable.block(); + * // Check for any errors that arose during `flush` + * let _ = this.check-write(); // eliding error handling + * ``` + */ + blockingWriteAndFlush(contents: Uint8Array): void; + /** + * Request to flush buffered output. This function never blocks. + * + * This tells the output-stream that the caller intends any buffered + * output to be flushed. the output which is expected to be flushed + * is all that has been passed to `write` prior to this call. + * + * Upon calling this function, the `output-stream` will not accept any + * writes (`check-write` will return `ok(0)`) until the flush has + * completed. The `subscribe` pollable will become ready when the + * flush has completed and the stream can accept more writes. + */ + flush(): void; + /** + * Request to flush buffered output, and block until flush completes + * and stream is ready for writing again. + */ + blockingFlush(): void; + /** + * Create a `pollable` which will resolve once the output-stream + * is ready for more writing, or an error has occured. When this + * pollable is ready, `check-write` will return `ok(n)` with n>0, or an + * error. + * + * If the stream is closed, this pollable is always ready immediately. + * + * The created `pollable` is a child resource of the `output-stream`. + * Implementations may trap if the `output-stream` is dropped before + * all derived `pollable`s created with this function are dropped. + */ + subscribe(): Pollable; + /** + * Write zeroes to a stream. + * + * This should be used precisely like `write` with the exact same + * preconditions (must use check-write first), but instead of + * passing a list of bytes, you simply pass the number of zero-bytes + * that should be written. + */ + writeZeroes(len: bigint): void; + /** + * Perform a write of up to 4096 zeroes, and then flush the stream. + * Block until all of these operations are complete, or an error + * occurs. + * + * This is a convenience wrapper around the use of `check-write`, + * `subscribe`, `write-zeroes`, and `flush`, and is implemented with + * the following pseudo-code: + * + * ```text + * let pollable = this.subscribe(); + * while num_zeroes != 0 { + * // Wait for the stream to become writable + * pollable.block(); + * let Ok(n) = this.check-write(); // eliding error handling + * let len = min(n, num_zeroes); + * this.write-zeroes(len); // eliding error handling + * num_zeroes -= len; + * } + * this.flush(); + * // Wait for completion of `flush` + * pollable.block(); + * // Check for any errors that arose during `flush` + * let _ = this.check-write(); // eliding error handling + * ``` + */ + blockingWriteZeroesAndFlush(len: bigint): void; + /** + * Read from one stream and write to another. + * + * The behavior of splice is equivelant to: + * 1. calling `check-write` on the `output-stream` + * 2. calling `read` on the `input-stream` with the smaller of the + * `check-write` permitted length and the `len` provided to `splice` + * 3. calling `write` on the `output-stream` with that read data. + * + * Any error reported by the call to `check-write`, `read`, or + * `write` ends the splice and reports that error. + * + * This function returns the number of bytes transferred; it may be less + * than `len`. + */ + splice(src: InputStream, len: bigint): bigint; + /** + * Read from one stream and write to another, with blocking. + * + * This is similar to `splice`, except that it blocks until the + * `output-stream` is ready for writing, and the `input-stream` + * is ready for reading, before performing the `splice`. + */ + blockingSplice(src: InputStream, len: bigint): bigint; + } + \ No newline at end of file diff --git a/examples/components/http-hello-world/types/wit.d.ts b/examples/components/http-hello-world/types/wit.d.ts new file mode 100644 index 000000000..2dcc5191a --- /dev/null +++ b/examples/components/http-hello-world/types/wit.d.ts @@ -0,0 +1,7 @@ +import { WasiClocksMonotonicClock } from './interfaces/wasi-clocks-monotonic-clock.js'; +import { WasiHttpTypes } from './interfaces/wasi-http-types.js'; +import { WasiIoError } from './interfaces/wasi-io-error.js'; +import { WasiIoPoll } from './interfaces/wasi-io-poll.js'; +import { WasiIoStreams } from './interfaces/wasi-io-streams.js'; +import { WasiHttpIncomingHandler } from './interfaces/wasi-http-incoming-handler.js'; +export const incomingHandler: typeof WasiHttpIncomingHandler; diff --git a/examples/components/http-hello-world/wit/component.wit b/examples/components/http-hello-world/wit/component.wit new file mode 100644 index 000000000..455b24c2e --- /dev/null +++ b/examples/components/http-hello-world/wit/component.wit @@ -0,0 +1,5 @@ +package example:http-hello-world; + +world component { + export wasi:http/incoming-handler@0.2.2; +} diff --git a/examples/components/http-hello-world/wit/deps/wasi_cli@0.2.2.wit b/examples/components/http-hello-world/wit/deps/wasi_cli@0.2.2.wit new file mode 100644 index 000000000..f89bf6949 --- /dev/null +++ b/examples/components/http-hello-world/wit/deps/wasi_cli@0.2.2.wit @@ -0,0 +1,246 @@ +package wasi:cli@0.2.2; + +@since(version = 0.2.0) +interface environment { + /// Get the POSIX-style environment variables. + /// + /// Each environment variable is provided as a pair of string variable names + /// and string value. + /// + /// Morally, these are a value import, but until value imports are available + /// in the component model, this import function should return the same + /// values each time it is called. + @since(version = 0.2.0) + get-environment: func() -> list>; + + /// Get the POSIX-style arguments to the program. + @since(version = 0.2.0) + get-arguments: func() -> list; + + /// Return a path that programs should use as their initial current working + /// directory, interpreting `.` as shorthand for this. + @since(version = 0.2.0) + initial-cwd: func() -> option; +} + +@since(version = 0.2.0) +interface exit { + /// Exit the current instance and any linked instances. + @since(version = 0.2.0) + exit: func(status: result); +} + +@since(version = 0.2.0) +interface run { + /// Run the program. + @since(version = 0.2.0) + run: func() -> result; +} + +@since(version = 0.2.0) +interface stdin { + @since(version = 0.2.0) + use wasi:io/streams@0.2.2.{input-stream}; + + @since(version = 0.2.0) + get-stdin: func() -> input-stream; +} + +@since(version = 0.2.0) +interface stdout { + @since(version = 0.2.0) + use wasi:io/streams@0.2.2.{output-stream}; + + @since(version = 0.2.0) + get-stdout: func() -> output-stream; +} + +@since(version = 0.2.0) +interface stderr { + @since(version = 0.2.0) + use wasi:io/streams@0.2.2.{output-stream}; + + @since(version = 0.2.0) + get-stderr: func() -> output-stream; +} + +/// Terminal input. +/// +/// In the future, this may include functions for disabling echoing, +/// disabling input buffering so that keyboard events are sent through +/// immediately, querying supported features, and so on. +@since(version = 0.2.0) +interface terminal-input { + /// The input side of a terminal. + @since(version = 0.2.0) + resource terminal-input; +} + +/// Terminal output. +/// +/// In the future, this may include functions for querying the terminal +/// size, being notified of terminal size changes, querying supported +/// features, and so on. +@since(version = 0.2.0) +interface terminal-output { + /// The output side of a terminal. + @since(version = 0.2.0) + resource terminal-output; +} + +/// An interface providing an optional `terminal-input` for stdin as a +/// link-time authority. +@since(version = 0.2.0) +interface terminal-stdin { + @since(version = 0.2.0) + use terminal-input.{terminal-input}; + + /// If stdin is connected to a terminal, return a `terminal-input` handle + /// allowing further interaction with it. + @since(version = 0.2.0) + get-terminal-stdin: func() -> option; +} + +/// An interface providing an optional `terminal-output` for stdout as a +/// link-time authority. +@since(version = 0.2.0) +interface terminal-stdout { + @since(version = 0.2.0) + use terminal-output.{terminal-output}; + + /// If stdout is connected to a terminal, return a `terminal-output` handle + /// allowing further interaction with it. + @since(version = 0.2.0) + get-terminal-stdout: func() -> option; +} + +/// An interface providing an optional `terminal-output` for stderr as a +/// link-time authority. +@since(version = 0.2.0) +interface terminal-stderr { + @since(version = 0.2.0) + use terminal-output.{terminal-output}; + + /// If stderr is connected to a terminal, return a `terminal-output` handle + /// allowing further interaction with it. + @since(version = 0.2.0) + get-terminal-stderr: func() -> option; +} + +@since(version = 0.2.0) +world imports { + @since(version = 0.2.0) + import environment; + @since(version = 0.2.0) + import exit; + @since(version = 0.2.0) + import wasi:io/error@0.2.2; + @since(version = 0.2.0) + import wasi:io/poll@0.2.2; + @since(version = 0.2.0) + import wasi:io/streams@0.2.2; + @since(version = 0.2.0) + import stdin; + @since(version = 0.2.0) + import stdout; + @since(version = 0.2.0) + import stderr; + @since(version = 0.2.0) + import terminal-input; + @since(version = 0.2.0) + import terminal-output; + @since(version = 0.2.0) + import terminal-stdin; + @since(version = 0.2.0) + import terminal-stdout; + @since(version = 0.2.0) + import terminal-stderr; + @since(version = 0.2.0) + import wasi:clocks/monotonic-clock@0.2.2; + @since(version = 0.2.0) + import wasi:clocks/wall-clock@0.2.2; + @since(version = 0.2.0) + import wasi:filesystem/types@0.2.2; + @since(version = 0.2.0) + import wasi:filesystem/preopens@0.2.2; + @since(version = 0.2.0) + import wasi:sockets/network@0.2.2; + @since(version = 0.2.0) + import wasi:sockets/instance-network@0.2.2; + @since(version = 0.2.0) + import wasi:sockets/udp@0.2.2; + @since(version = 0.2.0) + import wasi:sockets/udp-create-socket@0.2.2; + @since(version = 0.2.0) + import wasi:sockets/tcp@0.2.2; + @since(version = 0.2.0) + import wasi:sockets/tcp-create-socket@0.2.2; + @since(version = 0.2.0) + import wasi:sockets/ip-name-lookup@0.2.2; + @since(version = 0.2.0) + import wasi:random/random@0.2.2; + @since(version = 0.2.0) + import wasi:random/insecure@0.2.2; + @since(version = 0.2.0) + import wasi:random/insecure-seed@0.2.2; +} +@since(version = 0.2.0) +world command { + @since(version = 0.2.0) + import environment; + @since(version = 0.2.0) + import exit; + @since(version = 0.2.0) + import wasi:io/error@0.2.2; + @since(version = 0.2.0) + import wasi:io/poll@0.2.2; + @since(version = 0.2.0) + import wasi:io/streams@0.2.2; + @since(version = 0.2.0) + import stdin; + @since(version = 0.2.0) + import stdout; + @since(version = 0.2.0) + import stderr; + @since(version = 0.2.0) + import terminal-input; + @since(version = 0.2.0) + import terminal-output; + @since(version = 0.2.0) + import terminal-stdin; + @since(version = 0.2.0) + import terminal-stdout; + @since(version = 0.2.0) + import terminal-stderr; + @since(version = 0.2.0) + import wasi:clocks/monotonic-clock@0.2.2; + @since(version = 0.2.0) + import wasi:clocks/wall-clock@0.2.2; + @since(version = 0.2.0) + import wasi:filesystem/types@0.2.2; + @since(version = 0.2.0) + import wasi:filesystem/preopens@0.2.2; + @since(version = 0.2.0) + import wasi:sockets/network@0.2.2; + @since(version = 0.2.0) + import wasi:sockets/instance-network@0.2.2; + @since(version = 0.2.0) + import wasi:sockets/udp@0.2.2; + @since(version = 0.2.0) + import wasi:sockets/udp-create-socket@0.2.2; + @since(version = 0.2.0) + import wasi:sockets/tcp@0.2.2; + @since(version = 0.2.0) + import wasi:sockets/tcp-create-socket@0.2.2; + @since(version = 0.2.0) + import wasi:sockets/ip-name-lookup@0.2.2; + @since(version = 0.2.0) + import wasi:random/random@0.2.2; + @since(version = 0.2.0) + import wasi:random/insecure@0.2.2; + @since(version = 0.2.0) + import wasi:random/insecure-seed@0.2.2; + + @since(version = 0.2.0) + export run; +} diff --git a/examples/components/http-hello-world/wit/deps/wasi_clocks@0.2.2.wit b/examples/components/http-hello-world/wit/deps/wasi_clocks@0.2.2.wit new file mode 100644 index 000000000..2e3a2ed1d --- /dev/null +++ b/examples/components/http-hello-world/wit/deps/wasi_clocks@0.2.2.wit @@ -0,0 +1,103 @@ +package wasi:clocks@0.2.2; + +/// WASI Monotonic Clock is a clock API intended to let users measure elapsed +/// time. +/// +/// It is intended to be portable at least between Unix-family platforms and +/// Windows. +/// +/// A monotonic clock is a clock which has an unspecified initial value, and +/// successive reads of the clock will produce non-decreasing values. +@since(version = 0.2.0) +interface monotonic-clock { + @since(version = 0.2.0) + use wasi:io/poll@0.2.2.{pollable}; + + /// An instant in time, in nanoseconds. An instant is relative to an + /// unspecified initial value, and can only be compared to instances from + /// the same monotonic-clock. + @since(version = 0.2.0) + type instant = u64; + + /// A duration of time, in nanoseconds. + @since(version = 0.2.0) + type duration = u64; + + /// Read the current value of the clock. + /// + /// The clock is monotonic, therefore calling this function repeatedly will + /// produce a sequence of non-decreasing values. + @since(version = 0.2.0) + now: func() -> instant; + + /// Query the resolution of the clock. Returns the duration of time + /// corresponding to a clock tick. + @since(version = 0.2.0) + resolution: func() -> duration; + + /// Create a `pollable` which will resolve once the specified instant + /// has occurred. + @since(version = 0.2.0) + subscribe-instant: func(when: instant) -> pollable; + + /// Create a `pollable` that will resolve after the specified duration has + /// elapsed from the time this function is invoked. + @since(version = 0.2.0) + subscribe-duration: func(when: duration) -> pollable; +} + +/// WASI Wall Clock is a clock API intended to let users query the current +/// time. The name "wall" makes an analogy to a "clock on the wall", which +/// is not necessarily monotonic as it may be reset. +/// +/// It is intended to be portable at least between Unix-family platforms and +/// Windows. +/// +/// A wall clock is a clock which measures the date and time according to +/// some external reference. +/// +/// External references may be reset, so this clock is not necessarily +/// monotonic, making it unsuitable for measuring elapsed time. +/// +/// It is intended for reporting the current date and time for humans. +@since(version = 0.2.0) +interface wall-clock { + /// A time and date in seconds plus nanoseconds. + @since(version = 0.2.0) + record datetime { + seconds: u64, + nanoseconds: u32, + } + + /// Read the current value of the clock. + /// + /// This clock is not monotonic, therefore calling this function repeatedly + /// will not necessarily produce a sequence of non-decreasing values. + /// + /// The returned timestamps represent the number of seconds since + /// 1970-01-01T00:00:00Z, also known as [POSIX's Seconds Since the Epoch], + /// also known as [Unix Time]. + /// + /// The nanoseconds field of the output is always less than 1000000000. + /// + /// [POSIX's Seconds Since the Epoch]: https://pubs.opengroup.org/onlinepubs/9699919799/xrat/V4_xbd_chap04.html#tag_21_04_16 + /// [Unix Time]: https://en.wikipedia.org/wiki/Unix_time + @since(version = 0.2.0) + now: func() -> datetime; + + /// Query the resolution of the clock. + /// + /// The nanoseconds field of the output is always less than 1000000000. + @since(version = 0.2.0) + resolution: func() -> datetime; +} + +@since(version = 0.2.0) +world imports { + @since(version = 0.2.0) + import wasi:io/poll@0.2.2; + @since(version = 0.2.0) + import monotonic-clock; + @since(version = 0.2.0) + import wall-clock; +} diff --git a/examples/components/http-hello-world/wit/deps/wasi_filesystem@0.2.2.wit b/examples/components/http-hello-world/wit/deps/wasi_filesystem@0.2.2.wit new file mode 100644 index 000000000..8016e19f7 --- /dev/null +++ b/examples/components/http-hello-world/wit/deps/wasi_filesystem@0.2.2.wit @@ -0,0 +1,583 @@ +package wasi:filesystem@0.2.2; + +/// WASI filesystem is a filesystem API primarily intended to let users run WASI +/// programs that access their files on their existing filesystems, without +/// significant overhead. +/// +/// It is intended to be roughly portable between Unix-family platforms and +/// Windows, though it does not hide many of the major differences. +/// +/// Paths are passed as interface-type `string`s, meaning they must consist of +/// a sequence of Unicode Scalar Values (USVs). Some filesystems may contain +/// paths which are not accessible by this API. +/// +/// The directory separator in WASI is always the forward-slash (`/`). +/// +/// All paths in WASI are relative paths, and are interpreted relative to a +/// `descriptor` referring to a base directory. If a `path` argument to any WASI +/// function starts with `/`, or if any step of resolving a `path`, including +/// `..` and symbolic link steps, reaches a directory outside of the base +/// directory, or reaches a symlink to an absolute or rooted path in the +/// underlying filesystem, the function fails with `error-code::not-permitted`. +/// +/// For more information about WASI path resolution and sandboxing, see +/// [WASI filesystem path resolution]. +/// +/// [WASI filesystem path resolution]: https://github.com/WebAssembly/wasi-filesystem/blob/main/path-resolution.md +@since(version = 0.2.0) +interface types { + @since(version = 0.2.0) + use wasi:io/streams@0.2.2.{input-stream, output-stream, error}; + @since(version = 0.2.0) + use wasi:clocks/wall-clock@0.2.2.{datetime}; + + /// File size or length of a region within a file. + @since(version = 0.2.0) + type filesize = u64; + + /// The type of a filesystem object referenced by a descriptor. + /// + /// Note: This was called `filetype` in earlier versions of WASI. + @since(version = 0.2.0) + enum descriptor-type { + /// The type of the descriptor or file is unknown or is different from + /// any of the other types specified. + unknown, + /// The descriptor refers to a block device inode. + block-device, + /// The descriptor refers to a character device inode. + character-device, + /// The descriptor refers to a directory inode. + directory, + /// The descriptor refers to a named pipe. + fifo, + /// The file refers to a symbolic link inode. + symbolic-link, + /// The descriptor refers to a regular file inode. + regular-file, + /// The descriptor refers to a socket. + socket, + } + + /// Descriptor flags. + /// + /// Note: This was called `fdflags` in earlier versions of WASI. + @since(version = 0.2.0) + flags descriptor-flags { + /// Read mode: Data can be read. + read, + /// Write mode: Data can be written to. + write, + /// Request that writes be performed according to synchronized I/O file + /// integrity completion. The data stored in the file and the file's + /// metadata are synchronized. This is similar to `O_SYNC` in POSIX. + /// + /// The precise semantics of this operation have not yet been defined for + /// WASI. At this time, it should be interpreted as a request, and not a + /// requirement. + file-integrity-sync, + /// Request that writes be performed according to synchronized I/O data + /// integrity completion. Only the data stored in the file is + /// synchronized. This is similar to `O_DSYNC` in POSIX. + /// + /// The precise semantics of this operation have not yet been defined for + /// WASI. At this time, it should be interpreted as a request, and not a + /// requirement. + data-integrity-sync, + /// Requests that reads be performed at the same level of integrity + /// requested for writes. This is similar to `O_RSYNC` in POSIX. + /// + /// The precise semantics of this operation have not yet been defined for + /// WASI. At this time, it should be interpreted as a request, and not a + /// requirement. + requested-write-sync, + /// Mutating directories mode: Directory contents may be mutated. + /// + /// When this flag is unset on a descriptor, operations using the + /// descriptor which would create, rename, delete, modify the data or + /// metadata of filesystem objects, or obtain another handle which + /// would permit any of those, shall fail with `error-code::read-only` if + /// they would otherwise succeed. + /// + /// This may only be set on directories. + mutate-directory, + } + + /// Flags determining the method of how paths are resolved. + @since(version = 0.2.0) + flags path-flags { + /// As long as the resolved path corresponds to a symbolic link, it is + /// expanded. + symlink-follow, + } + + /// Open flags used by `open-at`. + @since(version = 0.2.0) + flags open-flags { + /// Create file if it does not exist, similar to `O_CREAT` in POSIX. + create, + /// Fail if not a directory, similar to `O_DIRECTORY` in POSIX. + directory, + /// Fail if file already exists, similar to `O_EXCL` in POSIX. + exclusive, + /// Truncate file to size 0, similar to `O_TRUNC` in POSIX. + truncate, + } + + /// Number of hard links to an inode. + @since(version = 0.2.0) + type link-count = u64; + + /// File attributes. + /// + /// Note: This was called `filestat` in earlier versions of WASI. + @since(version = 0.2.0) + record descriptor-stat { + /// File type. + %type: descriptor-type, + /// Number of hard links to the file. + link-count: link-count, + /// For regular files, the file size in bytes. For symbolic links, the + /// length in bytes of the pathname contained in the symbolic link. + size: filesize, + /// Last data access timestamp. + /// + /// If the `option` is none, the platform doesn't maintain an access + /// timestamp for this file. + data-access-timestamp: option, + /// Last data modification timestamp. + /// + /// If the `option` is none, the platform doesn't maintain a + /// modification timestamp for this file. + data-modification-timestamp: option, + /// Last file status-change timestamp. + /// + /// If the `option` is none, the platform doesn't maintain a + /// status-change timestamp for this file. + status-change-timestamp: option, + } + + /// When setting a timestamp, this gives the value to set it to. + @since(version = 0.2.0) + variant new-timestamp { + /// Leave the timestamp set to its previous value. + no-change, + /// Set the timestamp to the current time of the system clock associated + /// with the filesystem. + now, + /// Set the timestamp to the given value. + timestamp(datetime), + } + + /// A directory entry. + record directory-entry { + /// The type of the file referred to by this directory entry. + %type: descriptor-type, + /// The name of the object. + name: string, + } + + /// Error codes returned by functions, similar to `errno` in POSIX. + /// Not all of these error codes are returned by the functions provided by this + /// API; some are used in higher-level library layers, and others are provided + /// merely for alignment with POSIX. + enum error-code { + /// Permission denied, similar to `EACCES` in POSIX. + access, + /// Resource unavailable, or operation would block, similar to `EAGAIN` and `EWOULDBLOCK` in POSIX. + would-block, + /// Connection already in progress, similar to `EALREADY` in POSIX. + already, + /// Bad descriptor, similar to `EBADF` in POSIX. + bad-descriptor, + /// Device or resource busy, similar to `EBUSY` in POSIX. + busy, + /// Resource deadlock would occur, similar to `EDEADLK` in POSIX. + deadlock, + /// Storage quota exceeded, similar to `EDQUOT` in POSIX. + quota, + /// File exists, similar to `EEXIST` in POSIX. + exist, + /// File too large, similar to `EFBIG` in POSIX. + file-too-large, + /// Illegal byte sequence, similar to `EILSEQ` in POSIX. + illegal-byte-sequence, + /// Operation in progress, similar to `EINPROGRESS` in POSIX. + in-progress, + /// Interrupted function, similar to `EINTR` in POSIX. + interrupted, + /// Invalid argument, similar to `EINVAL` in POSIX. + invalid, + /// I/O error, similar to `EIO` in POSIX. + io, + /// Is a directory, similar to `EISDIR` in POSIX. + is-directory, + /// Too many levels of symbolic links, similar to `ELOOP` in POSIX. + loop, + /// Too many links, similar to `EMLINK` in POSIX. + too-many-links, + /// Message too large, similar to `EMSGSIZE` in POSIX. + message-size, + /// Filename too long, similar to `ENAMETOOLONG` in POSIX. + name-too-long, + /// No such device, similar to `ENODEV` in POSIX. + no-device, + /// No such file or directory, similar to `ENOENT` in POSIX. + no-entry, + /// No locks available, similar to `ENOLCK` in POSIX. + no-lock, + /// Not enough space, similar to `ENOMEM` in POSIX. + insufficient-memory, + /// No space left on device, similar to `ENOSPC` in POSIX. + insufficient-space, + /// Not a directory or a symbolic link to a directory, similar to `ENOTDIR` in POSIX. + not-directory, + /// Directory not empty, similar to `ENOTEMPTY` in POSIX. + not-empty, + /// State not recoverable, similar to `ENOTRECOVERABLE` in POSIX. + not-recoverable, + /// Not supported, similar to `ENOTSUP` and `ENOSYS` in POSIX. + unsupported, + /// Inappropriate I/O control operation, similar to `ENOTTY` in POSIX. + no-tty, + /// No such device or address, similar to `ENXIO` in POSIX. + no-such-device, + /// Value too large to be stored in data type, similar to `EOVERFLOW` in POSIX. + overflow, + /// Operation not permitted, similar to `EPERM` in POSIX. + not-permitted, + /// Broken pipe, similar to `EPIPE` in POSIX. + pipe, + /// Read-only file system, similar to `EROFS` in POSIX. + read-only, + /// Invalid seek, similar to `ESPIPE` in POSIX. + invalid-seek, + /// Text file busy, similar to `ETXTBSY` in POSIX. + text-file-busy, + /// Cross-device link, similar to `EXDEV` in POSIX. + cross-device, + } + + /// File or memory access pattern advisory information. + @since(version = 0.2.0) + enum advice { + /// The application has no advice to give on its behavior with respect + /// to the specified data. + normal, + /// The application expects to access the specified data sequentially + /// from lower offsets to higher offsets. + sequential, + /// The application expects to access the specified data in a random + /// order. + random, + /// The application expects to access the specified data in the near + /// future. + will-need, + /// The application expects that it will not access the specified data + /// in the near future. + dont-need, + /// The application expects to access the specified data once and then + /// not reuse it thereafter. + no-reuse, + } + + /// A 128-bit hash value, split into parts because wasm doesn't have a + /// 128-bit integer type. + @since(version = 0.2.0) + record metadata-hash-value { + /// 64 bits of a 128-bit hash value. + lower: u64, + /// Another 64 bits of a 128-bit hash value. + upper: u64, + } + + /// A descriptor is a reference to a filesystem object, which may be a file, + /// directory, named pipe, special file, or other object on which filesystem + /// calls may be made. + @since(version = 0.2.0) + resource descriptor { + /// Return a stream for reading from a file, if available. + /// + /// May fail with an error-code describing why the file cannot be read. + /// + /// Multiple read, write, and append streams may be active on the same open + /// file and they do not interfere with each other. + /// + /// Note: This allows using `read-stream`, which is similar to `read` in POSIX. + @since(version = 0.2.0) + read-via-stream: func(offset: filesize) -> result; + /// Return a stream for writing to a file, if available. + /// + /// May fail with an error-code describing why the file cannot be written. + /// + /// Note: This allows using `write-stream`, which is similar to `write` in + /// POSIX. + @since(version = 0.2.0) + write-via-stream: func(offset: filesize) -> result; + /// Return a stream for appending to a file, if available. + /// + /// May fail with an error-code describing why the file cannot be appended. + /// + /// Note: This allows using `write-stream`, which is similar to `write` with + /// `O_APPEND` in in POSIX. + @since(version = 0.2.0) + append-via-stream: func() -> result; + /// Provide file advisory information on a descriptor. + /// + /// This is similar to `posix_fadvise` in POSIX. + @since(version = 0.2.0) + advise: func(offset: filesize, length: filesize, advice: advice) -> result<_, error-code>; + /// Synchronize the data of a file to disk. + /// + /// This function succeeds with no effect if the file descriptor is not + /// opened for writing. + /// + /// Note: This is similar to `fdatasync` in POSIX. + @since(version = 0.2.0) + sync-data: func() -> result<_, error-code>; + /// Get flags associated with a descriptor. + /// + /// Note: This returns similar flags to `fcntl(fd, F_GETFL)` in POSIX. + /// + /// Note: This returns the value that was the `fs_flags` value returned + /// from `fdstat_get` in earlier versions of WASI. + @since(version = 0.2.0) + get-flags: func() -> result; + /// Get the dynamic type of a descriptor. + /// + /// Note: This returns the same value as the `type` field of the `fd-stat` + /// returned by `stat`, `stat-at` and similar. + /// + /// Note: This returns similar flags to the `st_mode & S_IFMT` value provided + /// by `fstat` in POSIX. + /// + /// Note: This returns the value that was the `fs_filetype` value returned + /// from `fdstat_get` in earlier versions of WASI. + @since(version = 0.2.0) + get-type: func() -> result; + /// Adjust the size of an open file. If this increases the file's size, the + /// extra bytes are filled with zeros. + /// + /// Note: This was called `fd_filestat_set_size` in earlier versions of WASI. + @since(version = 0.2.0) + set-size: func(size: filesize) -> result<_, error-code>; + /// Adjust the timestamps of an open file or directory. + /// + /// Note: This is similar to `futimens` in POSIX. + /// + /// Note: This was called `fd_filestat_set_times` in earlier versions of WASI. + @since(version = 0.2.0) + set-times: func(data-access-timestamp: new-timestamp, data-modification-timestamp: new-timestamp) -> result<_, error-code>; + /// Read from a descriptor, without using and updating the descriptor's offset. + /// + /// This function returns a list of bytes containing the data that was + /// read, along with a bool which, when true, indicates that the end of the + /// file was reached. The returned list will contain up to `length` bytes; it + /// may return fewer than requested, if the end of the file is reached or + /// if the I/O operation is interrupted. + /// + /// In the future, this may change to return a `stream`. + /// + /// Note: This is similar to `pread` in POSIX. + @since(version = 0.2.0) + read: func(length: filesize, offset: filesize) -> result, bool>, error-code>; + /// Write to a descriptor, without using and updating the descriptor's offset. + /// + /// It is valid to write past the end of a file; the file is extended to the + /// extent of the write, with bytes between the previous end and the start of + /// the write set to zero. + /// + /// In the future, this may change to take a `stream`. + /// + /// Note: This is similar to `pwrite` in POSIX. + @since(version = 0.2.0) + write: func(buffer: list, offset: filesize) -> result; + /// Read directory entries from a directory. + /// + /// On filesystems where directories contain entries referring to themselves + /// and their parents, often named `.` and `..` respectively, these entries + /// are omitted. + /// + /// This always returns a new stream which starts at the beginning of the + /// directory. Multiple streams may be active on the same directory, and they + /// do not interfere with each other. + @since(version = 0.2.0) + read-directory: func() -> result; + /// Synchronize the data and metadata of a file to disk. + /// + /// This function succeeds with no effect if the file descriptor is not + /// opened for writing. + /// + /// Note: This is similar to `fsync` in POSIX. + @since(version = 0.2.0) + sync: func() -> result<_, error-code>; + /// Create a directory. + /// + /// Note: This is similar to `mkdirat` in POSIX. + @since(version = 0.2.0) + create-directory-at: func(path: string) -> result<_, error-code>; + /// Return the attributes of an open file or directory. + /// + /// Note: This is similar to `fstat` in POSIX, except that it does not return + /// device and inode information. For testing whether two descriptors refer to + /// the same underlying filesystem object, use `is-same-object`. To obtain + /// additional data that can be used do determine whether a file has been + /// modified, use `metadata-hash`. + /// + /// Note: This was called `fd_filestat_get` in earlier versions of WASI. + @since(version = 0.2.0) + stat: func() -> result; + /// Return the attributes of a file or directory. + /// + /// Note: This is similar to `fstatat` in POSIX, except that it does not + /// return device and inode information. See the `stat` description for a + /// discussion of alternatives. + /// + /// Note: This was called `path_filestat_get` in earlier versions of WASI. + @since(version = 0.2.0) + stat-at: func(path-flags: path-flags, path: string) -> result; + /// Adjust the timestamps of a file or directory. + /// + /// Note: This is similar to `utimensat` in POSIX. + /// + /// Note: This was called `path_filestat_set_times` in earlier versions of + /// WASI. + @since(version = 0.2.0) + set-times-at: func(path-flags: path-flags, path: string, data-access-timestamp: new-timestamp, data-modification-timestamp: new-timestamp) -> result<_, error-code>; + /// Create a hard link. + /// + /// Note: This is similar to `linkat` in POSIX. + @since(version = 0.2.0) + link-at: func(old-path-flags: path-flags, old-path: string, new-descriptor: borrow, new-path: string) -> result<_, error-code>; + /// Open a file or directory. + /// + /// If `flags` contains `descriptor-flags::mutate-directory`, and the base + /// descriptor doesn't have `descriptor-flags::mutate-directory` set, + /// `open-at` fails with `error-code::read-only`. + /// + /// If `flags` contains `write` or `mutate-directory`, or `open-flags` + /// contains `truncate` or `create`, and the base descriptor doesn't have + /// `descriptor-flags::mutate-directory` set, `open-at` fails with + /// `error-code::read-only`. + /// + /// Note: This is similar to `openat` in POSIX. + @since(version = 0.2.0) + open-at: func(path-flags: path-flags, path: string, open-flags: open-flags, %flags: descriptor-flags) -> result; + /// Read the contents of a symbolic link. + /// + /// If the contents contain an absolute or rooted path in the underlying + /// filesystem, this function fails with `error-code::not-permitted`. + /// + /// Note: This is similar to `readlinkat` in POSIX. + @since(version = 0.2.0) + readlink-at: func(path: string) -> result; + /// Remove a directory. + /// + /// Return `error-code::not-empty` if the directory is not empty. + /// + /// Note: This is similar to `unlinkat(fd, path, AT_REMOVEDIR)` in POSIX. + @since(version = 0.2.0) + remove-directory-at: func(path: string) -> result<_, error-code>; + /// Rename a filesystem object. + /// + /// Note: This is similar to `renameat` in POSIX. + @since(version = 0.2.0) + rename-at: func(old-path: string, new-descriptor: borrow, new-path: string) -> result<_, error-code>; + /// Create a symbolic link (also known as a "symlink"). + /// + /// If `old-path` starts with `/`, the function fails with + /// `error-code::not-permitted`. + /// + /// Note: This is similar to `symlinkat` in POSIX. + @since(version = 0.2.0) + symlink-at: func(old-path: string, new-path: string) -> result<_, error-code>; + /// Unlink a filesystem object that is not a directory. + /// + /// Return `error-code::is-directory` if the path refers to a directory. + /// Note: This is similar to `unlinkat(fd, path, 0)` in POSIX. + @since(version = 0.2.0) + unlink-file-at: func(path: string) -> result<_, error-code>; + /// Test whether two descriptors refer to the same filesystem object. + /// + /// In POSIX, this corresponds to testing whether the two descriptors have the + /// same device (`st_dev`) and inode (`st_ino` or `d_ino`) numbers. + /// wasi-filesystem does not expose device and inode numbers, so this function + /// may be used instead. + @since(version = 0.2.0) + is-same-object: func(other: borrow) -> bool; + /// Return a hash of the metadata associated with a filesystem object referred + /// to by a descriptor. + /// + /// This returns a hash of the last-modification timestamp and file size, and + /// may also include the inode number, device number, birth timestamp, and + /// other metadata fields that may change when the file is modified or + /// replaced. It may also include a secret value chosen by the + /// implementation and not otherwise exposed. + /// + /// Implementations are encourated to provide the following properties: + /// + /// - If the file is not modified or replaced, the computed hash value should + /// usually not change. + /// - If the object is modified or replaced, the computed hash value should + /// usually change. + /// - The inputs to the hash should not be easily computable from the + /// computed hash. + /// + /// However, none of these is required. + @since(version = 0.2.0) + metadata-hash: func() -> result; + /// Return a hash of the metadata associated with a filesystem object referred + /// to by a directory descriptor and a relative path. + /// + /// This performs the same hash computation as `metadata-hash`. + @since(version = 0.2.0) + metadata-hash-at: func(path-flags: path-flags, path: string) -> result; + } + + /// A stream of directory entries. + @since(version = 0.2.0) + resource directory-entry-stream { + /// Read a single directory entry from a `directory-entry-stream`. + @since(version = 0.2.0) + read-directory-entry: func() -> result, error-code>; + } + + /// Attempts to extract a filesystem-related `error-code` from the stream + /// `error` provided. + /// + /// Stream operations which return `stream-error::last-operation-failed` + /// have a payload with more information about the operation that failed. + /// This payload can be passed through to this function to see if there's + /// filesystem-related information about the error to return. + /// + /// Note that this function is fallible because not all stream-related + /// errors are filesystem-related errors. + @since(version = 0.2.0) + filesystem-error-code: func(err: borrow) -> option; +} + +@since(version = 0.2.0) +interface preopens { + @since(version = 0.2.0) + use types.{descriptor}; + + /// Return the set of preopened directories, and their path. + @since(version = 0.2.0) + get-directories: func() -> list>; +} + +@since(version = 0.2.0) +world imports { + @since(version = 0.2.0) + import wasi:io/error@0.2.2; + @since(version = 0.2.0) + import wasi:io/poll@0.2.2; + @since(version = 0.2.0) + import wasi:io/streams@0.2.2; + @since(version = 0.2.0) + import wasi:clocks/wall-clock@0.2.2; + @since(version = 0.2.0) + import types; + @since(version = 0.2.0) + import preopens; +} diff --git a/examples/components/http-hello-world/wit/deps/wasi_http@0.2.2.wit b/examples/components/http-hello-world/wit/deps/wasi_http@0.2.2.wit new file mode 100644 index 000000000..3c17da201 --- /dev/null +++ b/examples/components/http-hello-world/wit/deps/wasi_http@0.2.2.wit @@ -0,0 +1,721 @@ +package wasi:http@0.2.2; + +/// This interface defines all of the types and methods for implementing +/// HTTP Requests and Responses, both incoming and outgoing, as well as +/// their headers, trailers, and bodies. +@since(version = 0.2.0) +interface types { + @since(version = 0.2.0) + use wasi:clocks/monotonic-clock@0.2.2.{duration}; + @since(version = 0.2.0) + use wasi:io/streams@0.2.2.{input-stream, output-stream}; + @since(version = 0.2.0) + use wasi:io/error@0.2.2.{error as io-error}; + @since(version = 0.2.0) + use wasi:io/poll@0.2.2.{pollable}; + + /// This type corresponds to HTTP standard Methods. + @since(version = 0.2.0) + variant method { + get, + head, + post, + put, + delete, + connect, + options, + trace, + patch, + other(string), + } + + /// This type corresponds to HTTP standard Related Schemes. + @since(version = 0.2.0) + variant scheme { + HTTP, + HTTPS, + other(string), + } + + /// Defines the case payload type for `DNS-error` above: + @since(version = 0.2.0) + record DNS-error-payload { + rcode: option, + info-code: option, + } + + /// Defines the case payload type for `TLS-alert-received` above: + @since(version = 0.2.0) + record TLS-alert-received-payload { + alert-id: option, + alert-message: option, + } + + /// Defines the case payload type for `HTTP-response-{header,trailer}-size` above: + @since(version = 0.2.0) + record field-size-payload { + field-name: option, + field-size: option, + } + + /// These cases are inspired by the IANA HTTP Proxy Error Types: + /// https://www.iana.org/assignments/http-proxy-status/http-proxy-status.xhtml#table-http-proxy-error-types + @since(version = 0.2.0) + variant error-code { + DNS-timeout, + DNS-error(DNS-error-payload), + destination-not-found, + destination-unavailable, + destination-IP-prohibited, + destination-IP-unroutable, + connection-refused, + connection-terminated, + connection-timeout, + connection-read-timeout, + connection-write-timeout, + connection-limit-reached, + TLS-protocol-error, + TLS-certificate-error, + TLS-alert-received(TLS-alert-received-payload), + HTTP-request-denied, + HTTP-request-length-required, + HTTP-request-body-size(option), + HTTP-request-method-invalid, + HTTP-request-URI-invalid, + HTTP-request-URI-too-long, + HTTP-request-header-section-size(option), + HTTP-request-header-size(option), + HTTP-request-trailer-section-size(option), + HTTP-request-trailer-size(field-size-payload), + HTTP-response-incomplete, + HTTP-response-header-section-size(option), + HTTP-response-header-size(field-size-payload), + HTTP-response-body-size(option), + HTTP-response-trailer-section-size(option), + HTTP-response-trailer-size(field-size-payload), + HTTP-response-transfer-coding(option), + HTTP-response-content-coding(option), + HTTP-response-timeout, + HTTP-upgrade-failed, + HTTP-protocol-error, + loop-detected, + configuration-error, + /// This is a catch-all error for anything that doesn't fit cleanly into a + /// more specific case. It also includes an optional string for an + /// unstructured description of the error. Users should not depend on the + /// string for diagnosing errors, as it's not required to be consistent + /// between implementations. + internal-error(option), + } + + /// This type enumerates the different kinds of errors that may occur when + /// setting or appending to a `fields` resource. + @since(version = 0.2.0) + variant header-error { + /// This error indicates that a `field-name` or `field-value` was + /// syntactically invalid when used with an operation that sets headers in a + /// `fields`. + invalid-syntax, + /// This error indicates that a forbidden `field-name` was used when trying + /// to set a header in a `fields`. + forbidden, + /// This error indicates that the operation on the `fields` was not + /// permitted because the fields are immutable. + immutable, + } + + /// Field keys are always strings. + /// + /// Field keys should always be treated as case insensitive by the `fields` + /// resource for the purposes of equality checking. + /// + /// # Deprecation + /// + /// This type has been deprecated in favor of the `field-name` type. + @since(version = 0.2.0) + @deprecated(version = 0.2.2) + type field-key = string; + + /// Field names are always strings. + /// + /// Field names should always be treated as case insensitive by the `fields` + /// resource for the purposes of equality checking. + @since(version = 0.2.1) + type field-name = field-key; + + /// Field values should always be ASCII strings. However, in + /// reality, HTTP implementations often have to interpret malformed values, + /// so they are provided as a list of bytes. + @since(version = 0.2.0) + type field-value = list; + + /// This following block defines the `fields` resource which corresponds to + /// HTTP standard Fields. Fields are a common representation used for both + /// Headers and Trailers. + /// + /// A `fields` may be mutable or immutable. A `fields` created using the + /// constructor, `from-list`, or `clone` will be mutable, but a `fields` + /// resource given by other means (including, but not limited to, + /// `incoming-request.headers`, `outgoing-request.headers`) might be be + /// immutable. In an immutable fields, the `set`, `append`, and `delete` + /// operations will fail with `header-error.immutable`. + @since(version = 0.2.0) + resource fields { + /// Construct an empty HTTP Fields. + /// + /// The resulting `fields` is mutable. + @since(version = 0.2.0) + constructor(); + /// Construct an HTTP Fields. + /// + /// The resulting `fields` is mutable. + /// + /// The list represents each name-value pair in the Fields. Names + /// which have multiple values are represented by multiple entries in this + /// list with the same name. + /// + /// The tuple is a pair of the field name, represented as a string, and + /// Value, represented as a list of bytes. + /// + /// An error result will be returned if any `field-name` or `field-value` is + /// syntactically invalid, or if a field is forbidden. + @since(version = 0.2.0) + from-list: static func(entries: list>) -> result; + /// Get all of the values corresponding to a name. If the name is not present + /// in this `fields` or is syntactically invalid, an empty list is returned. + /// However, if the name is present but empty, this is represented by a list + /// with one or more empty field-values present. + @since(version = 0.2.0) + get: func(name: field-name) -> list; + /// Returns `true` when the name is present in this `fields`. If the name is + /// syntactically invalid, `false` is returned. + @since(version = 0.2.0) + has: func(name: field-name) -> bool; + /// Set all of the values for a name. Clears any existing values for that + /// name, if they have been set. + /// + /// Fails with `header-error.immutable` if the `fields` are immutable. + /// + /// Fails with `header-error.invalid-syntax` if the `field-name` or any of + /// the `field-value`s are syntactically invalid. + @since(version = 0.2.0) + set: func(name: field-name, value: list) -> result<_, header-error>; + /// Delete all values for a name. Does nothing if no values for the name + /// exist. + /// + /// Fails with `header-error.immutable` if the `fields` are immutable. + /// + /// Fails with `header-error.invalid-syntax` if the `field-name` is + /// syntactically invalid. + @since(version = 0.2.0) + delete: func(name: field-name) -> result<_, header-error>; + /// Append a value for a name. Does not change or delete any existing + /// values for that name. + /// + /// Fails with `header-error.immutable` if the `fields` are immutable. + /// + /// Fails with `header-error.invalid-syntax` if the `field-name` or + /// `field-value` are syntactically invalid. + @since(version = 0.2.0) + append: func(name: field-name, value: field-value) -> result<_, header-error>; + /// Retrieve the full set of names and values in the Fields. Like the + /// constructor, the list represents each name-value pair. + /// + /// The outer list represents each name-value pair in the Fields. Names + /// which have multiple values are represented by multiple entries in this + /// list with the same name. + /// + /// The names and values are always returned in the original casing and in + /// the order in which they will be serialized for transport. + @since(version = 0.2.0) + entries: func() -> list>; + /// Make a deep copy of the Fields. Equivalent in behavior to calling the + /// `fields` constructor on the return value of `entries`. The resulting + /// `fields` is mutable. + @since(version = 0.2.0) + clone: func() -> fields; + } + + /// Headers is an alias for Fields. + @since(version = 0.2.0) + type headers = fields; + + /// Trailers is an alias for Fields. + @since(version = 0.2.0) + type trailers = fields; + + /// Represents an incoming HTTP Request. + @since(version = 0.2.0) + resource incoming-request { + /// Returns the method of the incoming request. + @since(version = 0.2.0) + method: func() -> method; + /// Returns the path with query parameters from the request, as a string. + @since(version = 0.2.0) + path-with-query: func() -> option; + /// Returns the protocol scheme from the request. + @since(version = 0.2.0) + scheme: func() -> option; + /// Returns the authority of the Request's target URI, if present. + @since(version = 0.2.0) + authority: func() -> option; + /// Get the `headers` associated with the request. + /// + /// The returned `headers` resource is immutable: `set`, `append`, and + /// `delete` operations will fail with `header-error.immutable`. + /// + /// The `headers` returned are a child resource: it must be dropped before + /// the parent `incoming-request` is dropped. Dropping this + /// `incoming-request` before all children are dropped will trap. + @since(version = 0.2.0) + headers: func() -> headers; + /// Gives the `incoming-body` associated with this request. Will only + /// return success at most once, and subsequent calls will return error. + @since(version = 0.2.0) + consume: func() -> result; + } + + /// Represents an outgoing HTTP Request. + @since(version = 0.2.0) + resource outgoing-request { + /// Construct a new `outgoing-request` with a default `method` of `GET`, and + /// `none` values for `path-with-query`, `scheme`, and `authority`. + /// + /// * `headers` is the HTTP Headers for the Request. + /// + /// It is possible to construct, or manipulate with the accessor functions + /// below, an `outgoing-request` with an invalid combination of `scheme` + /// and `authority`, or `headers` which are not permitted to be sent. + /// It is the obligation of the `outgoing-handler.handle` implementation + /// to reject invalid constructions of `outgoing-request`. + @since(version = 0.2.0) + constructor(headers: headers); + /// Returns the resource corresponding to the outgoing Body for this + /// Request. + /// + /// Returns success on the first call: the `outgoing-body` resource for + /// this `outgoing-request` can be retrieved at most once. Subsequent + /// calls will return error. + @since(version = 0.2.0) + body: func() -> result; + /// Get the Method for the Request. + @since(version = 0.2.0) + method: func() -> method; + /// Set the Method for the Request. Fails if the string present in a + /// `method.other` argument is not a syntactically valid method. + @since(version = 0.2.0) + set-method: func(method: method) -> result; + /// Get the combination of the HTTP Path and Query for the Request. + /// When `none`, this represents an empty Path and empty Query. + @since(version = 0.2.0) + path-with-query: func() -> option; + /// Set the combination of the HTTP Path and Query for the Request. + /// When `none`, this represents an empty Path and empty Query. Fails is the + /// string given is not a syntactically valid path and query uri component. + @since(version = 0.2.0) + set-path-with-query: func(path-with-query: option) -> result; + /// Get the HTTP Related Scheme for the Request. When `none`, the + /// implementation may choose an appropriate default scheme. + @since(version = 0.2.0) + scheme: func() -> option; + /// Set the HTTP Related Scheme for the Request. When `none`, the + /// implementation may choose an appropriate default scheme. Fails if the + /// string given is not a syntactically valid uri scheme. + @since(version = 0.2.0) + set-scheme: func(scheme: option) -> result; + /// Get the authority of the Request's target URI. A value of `none` may be used + /// with Related Schemes which do not require an authority. The HTTP and + /// HTTPS schemes always require an authority. + @since(version = 0.2.0) + authority: func() -> option; + /// Set the authority of the Request's target URI. A value of `none` may be used + /// with Related Schemes which do not require an authority. The HTTP and + /// HTTPS schemes always require an authority. Fails if the string given is + /// not a syntactically valid URI authority. + @since(version = 0.2.0) + set-authority: func(authority: option) -> result; + /// Get the headers associated with the Request. + /// + /// The returned `headers` resource is immutable: `set`, `append`, and + /// `delete` operations will fail with `header-error.immutable`. + /// + /// This headers resource is a child: it must be dropped before the parent + /// `outgoing-request` is dropped, or its ownership is transferred to + /// another component by e.g. `outgoing-handler.handle`. + @since(version = 0.2.0) + headers: func() -> headers; + } + + /// Parameters for making an HTTP Request. Each of these parameters is + /// currently an optional timeout applicable to the transport layer of the + /// HTTP protocol. + /// + /// These timeouts are separate from any the user may use to bound a + /// blocking call to `wasi:io/poll.poll`. + @since(version = 0.2.0) + resource request-options { + /// Construct a default `request-options` value. + @since(version = 0.2.0) + constructor(); + /// The timeout for the initial connect to the HTTP Server. + @since(version = 0.2.0) + connect-timeout: func() -> option; + /// Set the timeout for the initial connect to the HTTP Server. An error + /// return value indicates that this timeout is not supported. + @since(version = 0.2.0) + set-connect-timeout: func(duration: option) -> result; + /// The timeout for receiving the first byte of the Response body. + @since(version = 0.2.0) + first-byte-timeout: func() -> option; + /// Set the timeout for receiving the first byte of the Response body. An + /// error return value indicates that this timeout is not supported. + @since(version = 0.2.0) + set-first-byte-timeout: func(duration: option) -> result; + /// The timeout for receiving subsequent chunks of bytes in the Response + /// body stream. + @since(version = 0.2.0) + between-bytes-timeout: func() -> option; + /// Set the timeout for receiving subsequent chunks of bytes in the Response + /// body stream. An error return value indicates that this timeout is not + /// supported. + @since(version = 0.2.0) + set-between-bytes-timeout: func(duration: option) -> result; + } + + /// Represents the ability to send an HTTP Response. + /// + /// This resource is used by the `wasi:http/incoming-handler` interface to + /// allow a Response to be sent corresponding to the Request provided as the + /// other argument to `incoming-handler.handle`. + @since(version = 0.2.0) + resource response-outparam { + /// Set the value of the `response-outparam` to either send a response, + /// or indicate an error. + /// + /// This method consumes the `response-outparam` to ensure that it is + /// called at most once. If it is never called, the implementation + /// will respond with an error. + /// + /// The user may provide an `error` to `response` to allow the + /// implementation determine how to respond with an HTTP error response. + @since(version = 0.2.0) + set: static func(param: response-outparam, response: result); + } + + /// This type corresponds to the HTTP standard Status Code. + @since(version = 0.2.0) + type status-code = u16; + + /// Represents an incoming HTTP Response. + @since(version = 0.2.0) + resource incoming-response { + /// Returns the status code from the incoming response. + @since(version = 0.2.0) + status: func() -> status-code; + /// Returns the headers from the incoming response. + /// + /// The returned `headers` resource is immutable: `set`, `append`, and + /// `delete` operations will fail with `header-error.immutable`. + /// + /// This headers resource is a child: it must be dropped before the parent + /// `incoming-response` is dropped. + @since(version = 0.2.0) + headers: func() -> headers; + /// Returns the incoming body. May be called at most once. Returns error + /// if called additional times. + @since(version = 0.2.0) + consume: func() -> result; + } + + /// Represents an incoming HTTP Request or Response's Body. + /// + /// A body has both its contents - a stream of bytes - and a (possibly + /// empty) set of trailers, indicating that the full contents of the + /// body have been received. This resource represents the contents as + /// an `input-stream` and the delivery of trailers as a `future-trailers`, + /// and ensures that the user of this interface may only be consuming either + /// the body contents or waiting on trailers at any given time. + @since(version = 0.2.0) + resource incoming-body { + /// Returns the contents of the body, as a stream of bytes. + /// + /// Returns success on first call: the stream representing the contents + /// can be retrieved at most once. Subsequent calls will return error. + /// + /// The returned `input-stream` resource is a child: it must be dropped + /// before the parent `incoming-body` is dropped, or consumed by + /// `incoming-body.finish`. + /// + /// This invariant ensures that the implementation can determine whether + /// the user is consuming the contents of the body, waiting on the + /// `future-trailers` to be ready, or neither. This allows for network + /// backpressure is to be applied when the user is consuming the body, + /// and for that backpressure to not inhibit delivery of the trailers if + /// the user does not read the entire body. + @since(version = 0.2.0) + %stream: func() -> result; + /// Takes ownership of `incoming-body`, and returns a `future-trailers`. + /// This function will trap if the `input-stream` child is still alive. + @since(version = 0.2.0) + finish: static func(this: incoming-body) -> future-trailers; + } + + /// Represents a future which may eventually return trailers, or an error. + /// + /// In the case that the incoming HTTP Request or Response did not have any + /// trailers, this future will resolve to the empty set of trailers once the + /// complete Request or Response body has been received. + @since(version = 0.2.0) + resource future-trailers { + /// Returns a pollable which becomes ready when either the trailers have + /// been received, or an error has occurred. When this pollable is ready, + /// the `get` method will return `some`. + @since(version = 0.2.0) + subscribe: func() -> pollable; + /// Returns the contents of the trailers, or an error which occurred, + /// once the future is ready. + /// + /// The outer `option` represents future readiness. Users can wait on this + /// `option` to become `some` using the `subscribe` method. + /// + /// The outer `result` is used to retrieve the trailers or error at most + /// once. It will be success on the first call in which the outer option + /// is `some`, and error on subsequent calls. + /// + /// The inner `result` represents that either the HTTP Request or Response + /// body, as well as any trailers, were received successfully, or that an + /// error occurred receiving them. The optional `trailers` indicates whether + /// or not trailers were present in the body. + /// + /// When some `trailers` are returned by this method, the `trailers` + /// resource is immutable, and a child. Use of the `set`, `append`, or + /// `delete` methods will return an error, and the resource must be + /// dropped before the parent `future-trailers` is dropped. + @since(version = 0.2.0) + get: func() -> option, error-code>>>; + } + + /// Represents an outgoing HTTP Response. + @since(version = 0.2.0) + resource outgoing-response { + /// Construct an `outgoing-response`, with a default `status-code` of `200`. + /// If a different `status-code` is needed, it must be set via the + /// `set-status-code` method. + /// + /// * `headers` is the HTTP Headers for the Response. + @since(version = 0.2.0) + constructor(headers: headers); + /// Get the HTTP Status Code for the Response. + @since(version = 0.2.0) + status-code: func() -> status-code; + /// Set the HTTP Status Code for the Response. Fails if the status-code + /// given is not a valid http status code. + @since(version = 0.2.0) + set-status-code: func(status-code: status-code) -> result; + /// Get the headers associated with the Request. + /// + /// The returned `headers` resource is immutable: `set`, `append`, and + /// `delete` operations will fail with `header-error.immutable`. + /// + /// This headers resource is a child: it must be dropped before the parent + /// `outgoing-request` is dropped, or its ownership is transferred to + /// another component by e.g. `outgoing-handler.handle`. + @since(version = 0.2.0) + headers: func() -> headers; + /// Returns the resource corresponding to the outgoing Body for this Response. + /// + /// Returns success on the first call: the `outgoing-body` resource for + /// this `outgoing-response` can be retrieved at most once. Subsequent + /// calls will return error. + @since(version = 0.2.0) + body: func() -> result; + } + + /// Represents an outgoing HTTP Request or Response's Body. + /// + /// A body has both its contents - a stream of bytes - and a (possibly + /// empty) set of trailers, inducating the full contents of the body + /// have been sent. This resource represents the contents as an + /// `output-stream` child resource, and the completion of the body (with + /// optional trailers) with a static function that consumes the + /// `outgoing-body` resource, and ensures that the user of this interface + /// may not write to the body contents after the body has been finished. + /// + /// If the user code drops this resource, as opposed to calling the static + /// method `finish`, the implementation should treat the body as incomplete, + /// and that an error has occurred. The implementation should propagate this + /// error to the HTTP protocol by whatever means it has available, + /// including: corrupting the body on the wire, aborting the associated + /// Request, or sending a late status code for the Response. + @since(version = 0.2.0) + resource outgoing-body { + /// Returns a stream for writing the body contents. + /// + /// The returned `output-stream` is a child resource: it must be dropped + /// before the parent `outgoing-body` resource is dropped (or finished), + /// otherwise the `outgoing-body` drop or `finish` will trap. + /// + /// Returns success on the first call: the `output-stream` resource for + /// this `outgoing-body` may be retrieved at most once. Subsequent calls + /// will return error. + @since(version = 0.2.0) + write: func() -> result; + /// Finalize an outgoing body, optionally providing trailers. This must be + /// called to signal that the response is complete. If the `outgoing-body` + /// is dropped without calling `outgoing-body.finalize`, the implementation + /// should treat the body as corrupted. + /// + /// Fails if the body's `outgoing-request` or `outgoing-response` was + /// constructed with a Content-Length header, and the contents written + /// to the body (via `write`) does not match the value given in the + /// Content-Length. + @since(version = 0.2.0) + finish: static func(this: outgoing-body, trailers: option) -> result<_, error-code>; + } + + /// Represents a future which may eventually return an incoming HTTP + /// Response, or an error. + /// + /// This resource is returned by the `wasi:http/outgoing-handler` interface to + /// provide the HTTP Response corresponding to the sent Request. + @since(version = 0.2.0) + resource future-incoming-response { + /// Returns a pollable which becomes ready when either the Response has + /// been received, or an error has occurred. When this pollable is ready, + /// the `get` method will return `some`. + @since(version = 0.2.0) + subscribe: func() -> pollable; + /// Returns the incoming HTTP Response, or an error, once one is ready. + /// + /// The outer `option` represents future readiness. Users can wait on this + /// `option` to become `some` using the `subscribe` method. + /// + /// The outer `result` is used to retrieve the response or error at most + /// once. It will be success on the first call in which the outer option + /// is `some`, and error on subsequent calls. + /// + /// The inner `result` represents that either the incoming HTTP Response + /// status and headers have received successfully, or that an error + /// occurred. Errors may also occur while consuming the response body, + /// but those will be reported by the `incoming-body` and its + /// `output-stream` child. + @since(version = 0.2.0) + get: func() -> option>>; + } + + /// Attempts to extract a http-related `error` from the wasi:io `error` + /// provided. + /// + /// Stream operations which return + /// `wasi:io/stream/stream-error::last-operation-failed` have a payload of + /// type `wasi:io/error/error` with more information about the operation + /// that failed. This payload can be passed through to this function to see + /// if there's http-related information about the error to return. + /// + /// Note that this function is fallible because not all io-errors are + /// http-related errors. + @since(version = 0.2.0) + http-error-code: func(err: borrow) -> option; +} + +/// This interface defines a handler of incoming HTTP Requests. It should +/// be exported by components which can respond to HTTP Requests. +@since(version = 0.2.0) +interface incoming-handler { + @since(version = 0.2.0) + use types.{incoming-request, response-outparam}; + + /// This function is invoked with an incoming HTTP Request, and a resource + /// `response-outparam` which provides the capability to reply with an HTTP + /// Response. The response is sent by calling the `response-outparam.set` + /// method, which allows execution to continue after the response has been + /// sent. This enables both streaming to the response body, and performing other + /// work. + /// + /// The implementor of this function must write a response to the + /// `response-outparam` before returning, or else the caller will respond + /// with an error on its behalf. + @since(version = 0.2.0) + handle: func(request: incoming-request, response-out: response-outparam); +} + +/// This interface defines a handler of outgoing HTTP Requests. It should be +/// imported by components which wish to make HTTP Requests. +@since(version = 0.2.0) +interface outgoing-handler { + @since(version = 0.2.0) + use types.{outgoing-request, request-options, future-incoming-response, error-code}; + + /// This function is invoked with an outgoing HTTP Request, and it returns + /// a resource `future-incoming-response` which represents an HTTP Response + /// which may arrive in the future. + /// + /// The `options` argument accepts optional parameters for the HTTP + /// protocol's transport layer. + /// + /// This function may return an error if the `outgoing-request` is invalid + /// or not allowed to be made. Otherwise, protocol errors are reported + /// through the `future-incoming-response`. + @since(version = 0.2.0) + handle: func(request: outgoing-request, options: option) -> result; +} + +/// The `wasi:http/imports` world imports all the APIs for HTTP proxies. +/// It is intended to be `include`d in other worlds. +@since(version = 0.2.0) +world imports { + @since(version = 0.2.0) + import wasi:io/poll@0.2.2; + @since(version = 0.2.0) + import wasi:clocks/monotonic-clock@0.2.2; + @since(version = 0.2.0) + import wasi:clocks/wall-clock@0.2.2; + @since(version = 0.2.0) + import wasi:random/random@0.2.2; + @since(version = 0.2.0) + import wasi:io/error@0.2.2; + @since(version = 0.2.0) + import wasi:io/streams@0.2.2; + @since(version = 0.2.0) + import wasi:cli/stdout@0.2.2; + @since(version = 0.2.0) + import wasi:cli/stderr@0.2.2; + @since(version = 0.2.0) + import wasi:cli/stdin@0.2.2; + @since(version = 0.2.0) + import types; + @since(version = 0.2.0) + import outgoing-handler; +} +/// The `wasi:http/proxy` world captures a widely-implementable intersection of +/// hosts that includes HTTP forward and reverse proxies. Components targeting +/// this world may concurrently stream in and out any number of incoming and +/// outgoing HTTP requests. +@since(version = 0.2.0) +world proxy { + @since(version = 0.2.0) + import wasi:io/poll@0.2.2; + @since(version = 0.2.0) + import wasi:clocks/monotonic-clock@0.2.2; + @since(version = 0.2.0) + import wasi:io/error@0.2.2; + @since(version = 0.2.0) + import wasi:io/streams@0.2.2; + @since(version = 0.2.0) + import types; + @since(version = 0.2.0) + import wasi:clocks/wall-clock@0.2.2; + @since(version = 0.2.0) + import wasi:random/random@0.2.2; + @since(version = 0.2.0) + import wasi:cli/stdout@0.2.2; + @since(version = 0.2.0) + import wasi:cli/stderr@0.2.2; + @since(version = 0.2.0) + import wasi:cli/stdin@0.2.2; + @since(version = 0.2.0) + import outgoing-handler; + + @since(version = 0.2.0) + export incoming-handler; +} diff --git a/examples/components/http-hello-world/wit/deps/wasi_io@0.2.2.wit b/examples/components/http-hello-world/wit/deps/wasi_io@0.2.2.wit new file mode 100644 index 000000000..a5a852ead --- /dev/null +++ b/examples/components/http-hello-world/wit/deps/wasi_io@0.2.2.wit @@ -0,0 +1,331 @@ +package wasi:io@0.2.2; + +@since(version = 0.2.0) +interface error { + /// A resource which represents some error information. + /// + /// The only method provided by this resource is `to-debug-string`, + /// which provides some human-readable information about the error. + /// + /// In the `wasi:io` package, this resource is returned through the + /// `wasi:io/streams/stream-error` type. + /// + /// To provide more specific error information, other interfaces may + /// offer functions to "downcast" this error into more specific types. For example, + /// errors returned from streams derived from filesystem types can be described using + /// the filesystem's own error-code type. This is done using the function + /// `wasi:filesystem/types/filesystem-error-code`, which takes a `borrow` + /// parameter and returns an `option`. + /// + /// The set of functions which can "downcast" an `error` into a more + /// concrete type is open. + @since(version = 0.2.0) + resource error { + /// Returns a string that is suitable to assist humans in debugging + /// this error. + /// + /// WARNING: The returned string should not be consumed mechanically! + /// It may change across platforms, hosts, or other implementation + /// details. Parsing this string is a major platform-compatibility + /// hazard. + @since(version = 0.2.0) + to-debug-string: func() -> string; + } +} + +/// A poll API intended to let users wait for I/O events on multiple handles +/// at once. +@since(version = 0.2.0) +interface poll { + /// `pollable` represents a single I/O event which may be ready, or not. + @since(version = 0.2.0) + resource pollable { + /// Return the readiness of a pollable. This function never blocks. + /// + /// Returns `true` when the pollable is ready, and `false` otherwise. + @since(version = 0.2.0) + ready: func() -> bool; + /// `block` returns immediately if the pollable is ready, and otherwise + /// blocks until ready. + /// + /// This function is equivalent to calling `poll.poll` on a list + /// containing only this pollable. + @since(version = 0.2.0) + block: func(); + } + + /// Poll for completion on a set of pollables. + /// + /// This function takes a list of pollables, which identify I/O sources of + /// interest, and waits until one or more of the events is ready for I/O. + /// + /// The result `list` contains one or more indices of handles in the + /// argument list that is ready for I/O. + /// + /// This function traps if either: + /// - the list is empty, or: + /// - the list contains more elements than can be indexed with a `u32` value. + /// + /// A timeout can be implemented by adding a pollable from the + /// wasi-clocks API to the list. + /// + /// This function does not return a `result`; polling in itself does not + /// do any I/O so it doesn't fail. If any of the I/O sources identified by + /// the pollables has an error, it is indicated by marking the source as + /// being ready for I/O. + @since(version = 0.2.0) + poll: func(in: list>) -> list; +} + +/// WASI I/O is an I/O abstraction API which is currently focused on providing +/// stream types. +/// +/// In the future, the component model is expected to add built-in stream types; +/// when it does, they are expected to subsume this API. +@since(version = 0.2.0) +interface streams { + @since(version = 0.2.0) + use error.{error}; + @since(version = 0.2.0) + use poll.{pollable}; + + /// An error for input-stream and output-stream operations. + @since(version = 0.2.0) + variant stream-error { + /// The last operation (a write or flush) failed before completion. + /// + /// More information is available in the `error` payload. + /// + /// After this, the stream will be closed. All future operations return + /// `stream-error::closed`. + last-operation-failed(error), + /// The stream is closed: no more input will be accepted by the + /// stream. A closed output-stream will return this error on all + /// future operations. + closed, + } + + /// An input bytestream. + /// + /// `input-stream`s are *non-blocking* to the extent practical on underlying + /// platforms. I/O operations always return promptly; if fewer bytes are + /// promptly available than requested, they return the number of bytes promptly + /// available, which could even be zero. To wait for data to be available, + /// use the `subscribe` function to obtain a `pollable` which can be polled + /// for using `wasi:io/poll`. + @since(version = 0.2.0) + resource input-stream { + /// Perform a non-blocking read from the stream. + /// + /// When the source of a `read` is binary data, the bytes from the source + /// are returned verbatim. When the source of a `read` is known to the + /// implementation to be text, bytes containing the UTF-8 encoding of the + /// text are returned. + /// + /// This function returns a list of bytes containing the read data, + /// when successful. The returned list will contain up to `len` bytes; + /// it may return fewer than requested, but not more. The list is + /// empty when no bytes are available for reading at this time. The + /// pollable given by `subscribe` will be ready when more bytes are + /// available. + /// + /// This function fails with a `stream-error` when the operation + /// encounters an error, giving `last-operation-failed`, or when the + /// stream is closed, giving `closed`. + /// + /// When the caller gives a `len` of 0, it represents a request to + /// read 0 bytes. If the stream is still open, this call should + /// succeed and return an empty list, or otherwise fail with `closed`. + /// + /// The `len` parameter is a `u64`, which could represent a list of u8 which + /// is not possible to allocate in wasm32, or not desirable to allocate as + /// as a return value by the callee. The callee may return a list of bytes + /// less than `len` in size while more bytes are available for reading. + @since(version = 0.2.0) + read: func(len: u64) -> result, stream-error>; + /// Read bytes from a stream, after blocking until at least one byte can + /// be read. Except for blocking, behavior is identical to `read`. + @since(version = 0.2.0) + blocking-read: func(len: u64) -> result, stream-error>; + /// Skip bytes from a stream. Returns number of bytes skipped. + /// + /// Behaves identical to `read`, except instead of returning a list + /// of bytes, returns the number of bytes consumed from the stream. + @since(version = 0.2.0) + skip: func(len: u64) -> result; + /// Skip bytes from a stream, after blocking until at least one byte + /// can be skipped. Except for blocking behavior, identical to `skip`. + @since(version = 0.2.0) + blocking-skip: func(len: u64) -> result; + /// Create a `pollable` which will resolve once either the specified stream + /// has bytes available to read or the other end of the stream has been + /// closed. + /// The created `pollable` is a child resource of the `input-stream`. + /// Implementations may trap if the `input-stream` is dropped before + /// all derived `pollable`s created with this function are dropped. + @since(version = 0.2.0) + subscribe: func() -> pollable; + } + + /// An output bytestream. + /// + /// `output-stream`s are *non-blocking* to the extent practical on + /// underlying platforms. Except where specified otherwise, I/O operations also + /// always return promptly, after the number of bytes that can be written + /// promptly, which could even be zero. To wait for the stream to be ready to + /// accept data, the `subscribe` function to obtain a `pollable` which can be + /// polled for using `wasi:io/poll`. + /// + /// Dropping an `output-stream` while there's still an active write in + /// progress may result in the data being lost. Before dropping the stream, + /// be sure to fully flush your writes. + @since(version = 0.2.0) + resource output-stream { + /// Check readiness for writing. This function never blocks. + /// + /// Returns the number of bytes permitted for the next call to `write`, + /// or an error. Calling `write` with more bytes than this function has + /// permitted will trap. + /// + /// When this function returns 0 bytes, the `subscribe` pollable will + /// become ready when this function will report at least 1 byte, or an + /// error. + @since(version = 0.2.0) + check-write: func() -> result; + /// Perform a write. This function never blocks. + /// + /// When the destination of a `write` is binary data, the bytes from + /// `contents` are written verbatim. When the destination of a `write` is + /// known to the implementation to be text, the bytes of `contents` are + /// transcoded from UTF-8 into the encoding of the destination and then + /// written. + /// + /// Precondition: check-write gave permit of Ok(n) and contents has a + /// length of less than or equal to n. Otherwise, this function will trap. + /// + /// returns Err(closed) without writing if the stream has closed since + /// the last call to check-write provided a permit. + @since(version = 0.2.0) + write: func(contents: list) -> result<_, stream-error>; + /// Perform a write of up to 4096 bytes, and then flush the stream. Block + /// until all of these operations are complete, or an error occurs. + /// + /// This is a convenience wrapper around the use of `check-write`, + /// `subscribe`, `write`, and `flush`, and is implemented with the + /// following pseudo-code: + /// + /// ```text + /// let pollable = this.subscribe(); + /// while !contents.is_empty() { + /// // Wait for the stream to become writable + /// pollable.block(); + /// let Ok(n) = this.check-write(); // eliding error handling + /// let len = min(n, contents.len()); + /// let (chunk, rest) = contents.split_at(len); + /// this.write(chunk ); // eliding error handling + /// contents = rest; + /// } + /// this.flush(); + /// // Wait for completion of `flush` + /// pollable.block(); + /// // Check for any errors that arose during `flush` + /// let _ = this.check-write(); // eliding error handling + /// ``` + @since(version = 0.2.0) + blocking-write-and-flush: func(contents: list) -> result<_, stream-error>; + /// Request to flush buffered output. This function never blocks. + /// + /// This tells the output-stream that the caller intends any buffered + /// output to be flushed. the output which is expected to be flushed + /// is all that has been passed to `write` prior to this call. + /// + /// Upon calling this function, the `output-stream` will not accept any + /// writes (`check-write` will return `ok(0)`) until the flush has + /// completed. The `subscribe` pollable will become ready when the + /// flush has completed and the stream can accept more writes. + @since(version = 0.2.0) + flush: func() -> result<_, stream-error>; + /// Request to flush buffered output, and block until flush completes + /// and stream is ready for writing again. + @since(version = 0.2.0) + blocking-flush: func() -> result<_, stream-error>; + /// Create a `pollable` which will resolve once the output-stream + /// is ready for more writing, or an error has occurred. When this + /// pollable is ready, `check-write` will return `ok(n)` with n>0, or an + /// error. + /// + /// If the stream is closed, this pollable is always ready immediately. + /// + /// The created `pollable` is a child resource of the `output-stream`. + /// Implementations may trap if the `output-stream` is dropped before + /// all derived `pollable`s created with this function are dropped. + @since(version = 0.2.0) + subscribe: func() -> pollable; + /// Write zeroes to a stream. + /// + /// This should be used precisely like `write` with the exact same + /// preconditions (must use check-write first), but instead of + /// passing a list of bytes, you simply pass the number of zero-bytes + /// that should be written. + @since(version = 0.2.0) + write-zeroes: func(len: u64) -> result<_, stream-error>; + /// Perform a write of up to 4096 zeroes, and then flush the stream. + /// Block until all of these operations are complete, or an error + /// occurs. + /// + /// This is a convenience wrapper around the use of `check-write`, + /// `subscribe`, `write-zeroes`, and `flush`, and is implemented with + /// the following pseudo-code: + /// + /// ```text + /// let pollable = this.subscribe(); + /// while num_zeroes != 0 { + /// // Wait for the stream to become writable + /// pollable.block(); + /// let Ok(n) = this.check-write(); // eliding error handling + /// let len = min(n, num_zeroes); + /// this.write-zeroes(len); // eliding error handling + /// num_zeroes -= len; + /// } + /// this.flush(); + /// // Wait for completion of `flush` + /// pollable.block(); + /// // Check for any errors that arose during `flush` + /// let _ = this.check-write(); // eliding error handling + /// ``` + @since(version = 0.2.0) + blocking-write-zeroes-and-flush: func(len: u64) -> result<_, stream-error>; + /// Read from one stream and write to another. + /// + /// The behavior of splice is equivalent to: + /// 1. calling `check-write` on the `output-stream` + /// 2. calling `read` on the `input-stream` with the smaller of the + /// `check-write` permitted length and the `len` provided to `splice` + /// 3. calling `write` on the `output-stream` with that read data. + /// + /// Any error reported by the call to `check-write`, `read`, or + /// `write` ends the splice and reports that error. + /// + /// This function returns the number of bytes transferred; it may be less + /// than `len`. + @since(version = 0.2.0) + splice: func(src: borrow, len: u64) -> result; + /// Read from one stream and write to another, with blocking. + /// + /// This is similar to `splice`, except that it blocks until the + /// `output-stream` is ready for writing, and the `input-stream` + /// is ready for reading, before performing the `splice`. + @since(version = 0.2.0) + blocking-splice: func(src: borrow, len: u64) -> result; + } +} + +@since(version = 0.2.0) +world imports { + @since(version = 0.2.0) + import error; + @since(version = 0.2.0) + import poll; + @since(version = 0.2.0) + import streams; +} diff --git a/examples/components/http-hello-world/wit/deps/wasi_random@0.2.2.wit b/examples/components/http-hello-world/wit/deps/wasi_random@0.2.2.wit new file mode 100644 index 000000000..a121a6f0b --- /dev/null +++ b/examples/components/http-hello-world/wit/deps/wasi_random@0.2.2.wit @@ -0,0 +1,92 @@ +package wasi:random@0.2.2; + +/// The insecure-seed interface for seeding hash-map DoS resistance. +/// +/// It is intended to be portable at least between Unix-family platforms and +/// Windows. +@since(version = 0.2.0) +interface insecure-seed { + /// Return a 128-bit value that may contain a pseudo-random value. + /// + /// The returned value is not required to be computed from a CSPRNG, and may + /// even be entirely deterministic. Host implementations are encouraged to + /// provide pseudo-random values to any program exposed to + /// attacker-controlled content, to enable DoS protection built into many + /// languages' hash-map implementations. + /// + /// This function is intended to only be called once, by a source language + /// to initialize Denial Of Service (DoS) protection in its hash-map + /// implementation. + /// + /// # Expected future evolution + /// + /// This will likely be changed to a value import, to prevent it from being + /// called multiple times and potentially used for purposes other than DoS + /// protection. + @since(version = 0.2.0) + insecure-seed: func() -> tuple; +} + +/// The insecure interface for insecure pseudo-random numbers. +/// +/// It is intended to be portable at least between Unix-family platforms and +/// Windows. +@since(version = 0.2.0) +interface insecure { + /// Return `len` insecure pseudo-random bytes. + /// + /// This function is not cryptographically secure. Do not use it for + /// anything related to security. + /// + /// There are no requirements on the values of the returned bytes, however + /// implementations are encouraged to return evenly distributed values with + /// a long period. + @since(version = 0.2.0) + get-insecure-random-bytes: func(len: u64) -> list; + + /// Return an insecure pseudo-random `u64` value. + /// + /// This function returns the same type of pseudo-random data as + /// `get-insecure-random-bytes`, represented as a `u64`. + @since(version = 0.2.0) + get-insecure-random-u64: func() -> u64; +} + +/// WASI Random is a random data API. +/// +/// It is intended to be portable at least between Unix-family platforms and +/// Windows. +@since(version = 0.2.0) +interface random { + /// Return `len` cryptographically-secure random or pseudo-random bytes. + /// + /// This function must produce data at least as cryptographically secure and + /// fast as an adequately seeded cryptographically-secure pseudo-random + /// number generator (CSPRNG). It must not block, from the perspective of + /// the calling program, under any circumstances, including on the first + /// request and on requests for numbers of bytes. The returned data must + /// always be unpredictable. + /// + /// This function must always return fresh data. Deterministic environments + /// must omit this function, rather than implementing it with deterministic + /// data. + @since(version = 0.2.0) + get-random-bytes: func(len: u64) -> list; + + /// Return a cryptographically-secure random or pseudo-random `u64` value. + /// + /// This function returns the same type of data as `get-random-bytes`, + /// represented as a `u64`. + @since(version = 0.2.0) + get-random-u64: func() -> u64; +} + +@since(version = 0.2.0) +world imports { + @since(version = 0.2.0) + import random; + @since(version = 0.2.0) + import insecure; + @since(version = 0.2.0) + import insecure-seed; +} diff --git a/examples/components/http-hello-world/wit/deps/wasi_sockets@0.2.2.wit b/examples/components/http-hello-world/wit/deps/wasi_sockets@0.2.2.wit new file mode 100644 index 000000000..33a1a2789 --- /dev/null +++ b/examples/components/http-hello-world/wit/deps/wasi_sockets@0.2.2.wit @@ -0,0 +1,933 @@ +package wasi:sockets@0.2.2; + +@since(version = 0.2.0) +interface network { + /// An opaque resource that represents access to (a subset of) the network. + /// This enables context-based security for networking. + /// There is no need for this to map 1:1 to a physical network interface. + @since(version = 0.2.0) + resource network; + + /// Error codes. + /// + /// In theory, every API can return any error code. + /// In practice, API's typically only return the errors documented per API + /// combined with a couple of errors that are always possible: + /// - `unknown` + /// - `access-denied` + /// - `not-supported` + /// - `out-of-memory` + /// - `concurrency-conflict` + /// + /// See each individual API for what the POSIX equivalents are. They sometimes differ per API. + @since(version = 0.2.0) + enum error-code { + /// Unknown error + unknown, + /// Access denied. + /// + /// POSIX equivalent: EACCES, EPERM + access-denied, + /// The operation is not supported. + /// + /// POSIX equivalent: EOPNOTSUPP + not-supported, + /// One of the arguments is invalid. + /// + /// POSIX equivalent: EINVAL + invalid-argument, + /// Not enough memory to complete the operation. + /// + /// POSIX equivalent: ENOMEM, ENOBUFS, EAI_MEMORY + out-of-memory, + /// The operation timed out before it could finish completely. + timeout, + /// This operation is incompatible with another asynchronous operation that is already in progress. + /// + /// POSIX equivalent: EALREADY + concurrency-conflict, + /// Trying to finish an asynchronous operation that: + /// - has not been started yet, or: + /// - was already finished by a previous `finish-*` call. + /// + /// Note: this is scheduled to be removed when `future`s are natively supported. + not-in-progress, + /// The operation has been aborted because it could not be completed immediately. + /// + /// Note: this is scheduled to be removed when `future`s are natively supported. + would-block, + /// The operation is not valid in the socket's current state. + invalid-state, + /// A new socket resource could not be created because of a system limit. + new-socket-limit, + /// A bind operation failed because the provided address is not an address that the `network` can bind to. + address-not-bindable, + /// A bind operation failed because the provided address is already in use or because there are no ephemeral ports available. + address-in-use, + /// The remote address is not reachable + remote-unreachable, + /// The TCP connection was forcefully rejected + connection-refused, + /// The TCP connection was reset. + connection-reset, + /// A TCP connection was aborted. + connection-aborted, + /// The size of a datagram sent to a UDP socket exceeded the maximum + /// supported size. + datagram-too-large, + /// Name does not exist or has no suitable associated IP addresses. + name-unresolvable, + /// A temporary failure in name resolution occurred. + temporary-resolver-failure, + /// A permanent failure in name resolution occurred. + permanent-resolver-failure, + } + + @since(version = 0.2.0) + enum ip-address-family { + /// Similar to `AF_INET` in POSIX. + ipv4, + /// Similar to `AF_INET6` in POSIX. + ipv6, + } + + @since(version = 0.2.0) + type ipv4-address = tuple; + + @since(version = 0.2.0) + type ipv6-address = tuple; + + @since(version = 0.2.0) + variant ip-address { + ipv4(ipv4-address), + ipv6(ipv6-address), + } + + @since(version = 0.2.0) + record ipv4-socket-address { + /// sin_port + port: u16, + /// sin_addr + address: ipv4-address, + } + + @since(version = 0.2.0) + record ipv6-socket-address { + /// sin6_port + port: u16, + /// sin6_flowinfo + flow-info: u32, + /// sin6_addr + address: ipv6-address, + /// sin6_scope_id + scope-id: u32, + } + + @since(version = 0.2.0) + variant ip-socket-address { + ipv4(ipv4-socket-address), + ipv6(ipv6-socket-address), + } +} + +/// This interface provides a value-export of the default network handle.. +@since(version = 0.2.0) +interface instance-network { + @since(version = 0.2.0) + use network.{network}; + + /// Get a handle to the default network. + @since(version = 0.2.0) + instance-network: func() -> network; +} + +@since(version = 0.2.0) +interface ip-name-lookup { + @since(version = 0.2.0) + use wasi:io/poll@0.2.2.{pollable}; + @since(version = 0.2.0) + use network.{network, error-code, ip-address}; + + @since(version = 0.2.0) + resource resolve-address-stream { + /// Returns the next address from the resolver. + /// + /// This function should be called multiple times. On each call, it will + /// return the next address in connection order preference. If all + /// addresses have been exhausted, this function returns `none`. + /// + /// This function never returns IPv4-mapped IPv6 addresses. + /// + /// # Typical errors + /// - `name-unresolvable`: Name does not exist or has no suitable associated IP addresses. (EAI_NONAME, EAI_NODATA, EAI_ADDRFAMILY) + /// - `temporary-resolver-failure`: A temporary failure in name resolution occurred. (EAI_AGAIN) + /// - `permanent-resolver-failure`: A permanent failure in name resolution occurred. (EAI_FAIL) + /// - `would-block`: A result is not available yet. (EWOULDBLOCK, EAGAIN) + @since(version = 0.2.0) + resolve-next-address: func() -> result, error-code>; + /// Create a `pollable` which will resolve once the stream is ready for I/O. + /// + /// Note: this function is here for WASI 0.2 only. + /// It's planned to be removed when `future` is natively supported in Preview3. + @since(version = 0.2.0) + subscribe: func() -> pollable; + } + + /// Resolve an internet host name to a list of IP addresses. + /// + /// Unicode domain names are automatically converted to ASCII using IDNA encoding. + /// If the input is an IP address string, the address is parsed and returned + /// as-is without making any external requests. + /// + /// See the wasi-socket proposal README.md for a comparison with getaddrinfo. + /// + /// This function never blocks. It either immediately fails or immediately + /// returns successfully with a `resolve-address-stream` that can be used + /// to (asynchronously) fetch the results. + /// + /// # Typical errors + /// - `invalid-argument`: `name` is a syntactically invalid domain name or IP address. + /// + /// # References: + /// - + /// - + /// - + /// - + @since(version = 0.2.0) + resolve-addresses: func(network: borrow, name: string) -> result; +} + +@since(version = 0.2.0) +interface tcp { + @since(version = 0.2.0) + use wasi:io/streams@0.2.2.{input-stream, output-stream}; + @since(version = 0.2.0) + use wasi:io/poll@0.2.2.{pollable}; + @since(version = 0.2.0) + use wasi:clocks/monotonic-clock@0.2.2.{duration}; + @since(version = 0.2.0) + use network.{network, error-code, ip-socket-address, ip-address-family}; + + @since(version = 0.2.0) + enum shutdown-type { + /// Similar to `SHUT_RD` in POSIX. + receive, + /// Similar to `SHUT_WR` in POSIX. + send, + /// Similar to `SHUT_RDWR` in POSIX. + both, + } + + /// A TCP socket resource. + /// + /// The socket can be in one of the following states: + /// - `unbound` + /// - `bind-in-progress` + /// - `bound` (See note below) + /// - `listen-in-progress` + /// - `listening` + /// - `connect-in-progress` + /// - `connected` + /// - `closed` + /// See + /// for more information. + /// + /// Note: Except where explicitly mentioned, whenever this documentation uses + /// the term "bound" without backticks it actually means: in the `bound` state *or higher*. + /// (i.e. `bound`, `listen-in-progress`, `listening`, `connect-in-progress` or `connected`) + /// + /// In addition to the general error codes documented on the + /// `network::error-code` type, TCP socket methods may always return + /// `error(invalid-state)` when in the `closed` state. + @since(version = 0.2.0) + resource tcp-socket { + /// Bind the socket to a specific network on the provided IP address and port. + /// + /// If the IP address is zero (`0.0.0.0` in IPv4, `::` in IPv6), it is left to the implementation to decide which + /// network interface(s) to bind to. + /// If the TCP/UDP port is zero, the socket will be bound to a random free port. + /// + /// Bind can be attempted multiple times on the same socket, even with + /// different arguments on each iteration. But never concurrently and + /// only as long as the previous bind failed. Once a bind succeeds, the + /// binding can't be changed anymore. + /// + /// # Typical errors + /// - `invalid-argument`: The `local-address` has the wrong address family. (EAFNOSUPPORT, EFAULT on Windows) + /// - `invalid-argument`: `local-address` is not a unicast address. (EINVAL) + /// - `invalid-argument`: `local-address` is an IPv4-mapped IPv6 address. (EINVAL) + /// - `invalid-state`: The socket is already bound. (EINVAL) + /// - `address-in-use`: No ephemeral ports available. (EADDRINUSE, ENOBUFS on Windows) + /// - `address-in-use`: Address is already in use. (EADDRINUSE) + /// - `address-not-bindable`: `local-address` is not an address that the `network` can bind to. (EADDRNOTAVAIL) + /// - `not-in-progress`: A `bind` operation is not in progress. + /// - `would-block`: Can't finish the operation, it is still in progress. (EWOULDBLOCK, EAGAIN) + /// + /// # Implementors note + /// When binding to a non-zero port, this bind operation shouldn't be affected by the TIME_WAIT + /// state of a recently closed socket on the same local address. In practice this means that the SO_REUSEADDR + /// socket option should be set implicitly on all platforms, except on Windows where this is the default behavior + /// and SO_REUSEADDR performs something different entirely. + /// + /// Unlike in POSIX, in WASI the bind operation is async. This enables + /// interactive WASI hosts to inject permission prompts. Runtimes that + /// don't want to make use of this ability can simply call the native + /// `bind` as part of either `start-bind` or `finish-bind`. + /// + /// # References + /// - + /// - + /// - + /// - + @since(version = 0.2.0) + start-bind: func(network: borrow, local-address: ip-socket-address) -> result<_, error-code>; + @since(version = 0.2.0) + finish-bind: func() -> result<_, error-code>; + /// Connect to a remote endpoint. + /// + /// On success: + /// - the socket is transitioned into the `connected` state. + /// - a pair of streams is returned that can be used to read & write to the connection + /// + /// After a failed connection attempt, the socket will be in the `closed` + /// state and the only valid action left is to `drop` the socket. A single + /// socket can not be used to connect more than once. + /// + /// # Typical errors + /// - `invalid-argument`: The `remote-address` has the wrong address family. (EAFNOSUPPORT) + /// - `invalid-argument`: `remote-address` is not a unicast address. (EINVAL, ENETUNREACH on Linux, EAFNOSUPPORT on MacOS) + /// - `invalid-argument`: `remote-address` is an IPv4-mapped IPv6 address. (EINVAL, EADDRNOTAVAIL on Illumos) + /// - `invalid-argument`: The IP address in `remote-address` is set to INADDR_ANY (`0.0.0.0` / `::`). (EADDRNOTAVAIL on Windows) + /// - `invalid-argument`: The port in `remote-address` is set to 0. (EADDRNOTAVAIL on Windows) + /// - `invalid-argument`: The socket is already attached to a different network. The `network` passed to `connect` must be identical to the one passed to `bind`. + /// - `invalid-state`: The socket is already in the `connected` state. (EISCONN) + /// - `invalid-state`: The socket is already in the `listening` state. (EOPNOTSUPP, EINVAL on Windows) + /// - `timeout`: Connection timed out. (ETIMEDOUT) + /// - `connection-refused`: The connection was forcefully rejected. (ECONNREFUSED) + /// - `connection-reset`: The connection was reset. (ECONNRESET) + /// - `connection-aborted`: The connection was aborted. (ECONNABORTED) + /// - `remote-unreachable`: The remote address is not reachable. (EHOSTUNREACH, EHOSTDOWN, ENETUNREACH, ENETDOWN, ENONET) + /// - `address-in-use`: Tried to perform an implicit bind, but there were no ephemeral ports available. (EADDRINUSE, EADDRNOTAVAIL on Linux, EAGAIN on BSD) + /// - `not-in-progress`: A connect operation is not in progress. + /// - `would-block`: Can't finish the operation, it is still in progress. (EWOULDBLOCK, EAGAIN) + /// + /// # Implementors note + /// The POSIX equivalent of `start-connect` is the regular `connect` syscall. + /// Because all WASI sockets are non-blocking this is expected to return + /// EINPROGRESS, which should be translated to `ok()` in WASI. + /// + /// The POSIX equivalent of `finish-connect` is a `poll` for event `POLLOUT` + /// with a timeout of 0 on the socket descriptor. Followed by a check for + /// the `SO_ERROR` socket option, in case the poll signaled readiness. + /// + /// # References + /// - + /// - + /// - + /// - + @since(version = 0.2.0) + start-connect: func(network: borrow, remote-address: ip-socket-address) -> result<_, error-code>; + @since(version = 0.2.0) + finish-connect: func() -> result, error-code>; + /// Start listening for new connections. + /// + /// Transitions the socket into the `listening` state. + /// + /// Unlike POSIX, the socket must already be explicitly bound. + /// + /// # Typical errors + /// - `invalid-state`: The socket is not bound to any local address. (EDESTADDRREQ) + /// - `invalid-state`: The socket is already in the `connected` state. (EISCONN, EINVAL on BSD) + /// - `invalid-state`: The socket is already in the `listening` state. + /// - `address-in-use`: Tried to perform an implicit bind, but there were no ephemeral ports available. (EADDRINUSE) + /// - `not-in-progress`: A listen operation is not in progress. + /// - `would-block`: Can't finish the operation, it is still in progress. (EWOULDBLOCK, EAGAIN) + /// + /// # Implementors note + /// Unlike in POSIX, in WASI the listen operation is async. This enables + /// interactive WASI hosts to inject permission prompts. Runtimes that + /// don't want to make use of this ability can simply call the native + /// `listen` as part of either `start-listen` or `finish-listen`. + /// + /// # References + /// - + /// - + /// - + /// - + @since(version = 0.2.0) + start-listen: func() -> result<_, error-code>; + @since(version = 0.2.0) + finish-listen: func() -> result<_, error-code>; + /// Accept a new client socket. + /// + /// The returned socket is bound and in the `connected` state. The following properties are inherited from the listener socket: + /// - `address-family` + /// - `keep-alive-enabled` + /// - `keep-alive-idle-time` + /// - `keep-alive-interval` + /// - `keep-alive-count` + /// - `hop-limit` + /// - `receive-buffer-size` + /// - `send-buffer-size` + /// + /// On success, this function returns the newly accepted client socket along with + /// a pair of streams that can be used to read & write to the connection. + /// + /// # Typical errors + /// - `invalid-state`: Socket is not in the `listening` state. (EINVAL) + /// - `would-block`: No pending connections at the moment. (EWOULDBLOCK, EAGAIN) + /// - `connection-aborted`: An incoming connection was pending, but was terminated by the client before this listener could accept it. (ECONNABORTED) + /// - `new-socket-limit`: The new socket resource could not be created because of a system limit. (EMFILE, ENFILE) + /// + /// # References + /// - + /// - + /// - + /// - + @since(version = 0.2.0) + accept: func() -> result, error-code>; + /// Get the bound local address. + /// + /// POSIX mentions: + /// > If the socket has not been bound to a local name, the value + /// > stored in the object pointed to by `address` is unspecified. + /// + /// WASI is stricter and requires `local-address` to return `invalid-state` when the socket hasn't been bound yet. + /// + /// # Typical errors + /// - `invalid-state`: The socket is not bound to any local address. + /// + /// # References + /// - + /// - + /// - + /// - + @since(version = 0.2.0) + local-address: func() -> result; + /// Get the remote address. + /// + /// # Typical errors + /// - `invalid-state`: The socket is not connected to a remote address. (ENOTCONN) + /// + /// # References + /// - + /// - + /// - + /// - + @since(version = 0.2.0) + remote-address: func() -> result; + /// Whether the socket is in the `listening` state. + /// + /// Equivalent to the SO_ACCEPTCONN socket option. + @since(version = 0.2.0) + is-listening: func() -> bool; + /// Whether this is a IPv4 or IPv6 socket. + /// + /// Equivalent to the SO_DOMAIN socket option. + @since(version = 0.2.0) + address-family: func() -> ip-address-family; + /// Hints the desired listen queue size. Implementations are free to ignore this. + /// + /// If the provided value is 0, an `invalid-argument` error is returned. + /// Any other value will never cause an error, but it might be silently clamped and/or rounded. + /// + /// # Typical errors + /// - `not-supported`: (set) The platform does not support changing the backlog size after the initial listen. + /// - `invalid-argument`: (set) The provided value was 0. + /// - `invalid-state`: (set) The socket is in the `connect-in-progress` or `connected` state. + @since(version = 0.2.0) + set-listen-backlog-size: func(value: u64) -> result<_, error-code>; + /// Enables or disables keepalive. + /// + /// The keepalive behavior can be adjusted using: + /// - `keep-alive-idle-time` + /// - `keep-alive-interval` + /// - `keep-alive-count` + /// These properties can be configured while `keep-alive-enabled` is false, but only come into effect when `keep-alive-enabled` is true. + /// + /// Equivalent to the SO_KEEPALIVE socket option. + @since(version = 0.2.0) + keep-alive-enabled: func() -> result; + @since(version = 0.2.0) + set-keep-alive-enabled: func(value: bool) -> result<_, error-code>; + /// Amount of time the connection has to be idle before TCP starts sending keepalive packets. + /// + /// If the provided value is 0, an `invalid-argument` error is returned. + /// Any other value will never cause an error, but it might be silently clamped and/or rounded. + /// I.e. after setting a value, reading the same setting back may return a different value. + /// + /// Equivalent to the TCP_KEEPIDLE socket option. (TCP_KEEPALIVE on MacOS) + /// + /// # Typical errors + /// - `invalid-argument`: (set) The provided value was 0. + @since(version = 0.2.0) + keep-alive-idle-time: func() -> result; + @since(version = 0.2.0) + set-keep-alive-idle-time: func(value: duration) -> result<_, error-code>; + /// The time between keepalive packets. + /// + /// If the provided value is 0, an `invalid-argument` error is returned. + /// Any other value will never cause an error, but it might be silently clamped and/or rounded. + /// I.e. after setting a value, reading the same setting back may return a different value. + /// + /// Equivalent to the TCP_KEEPINTVL socket option. + /// + /// # Typical errors + /// - `invalid-argument`: (set) The provided value was 0. + @since(version = 0.2.0) + keep-alive-interval: func() -> result; + @since(version = 0.2.0) + set-keep-alive-interval: func(value: duration) -> result<_, error-code>; + /// The maximum amount of keepalive packets TCP should send before aborting the connection. + /// + /// If the provided value is 0, an `invalid-argument` error is returned. + /// Any other value will never cause an error, but it might be silently clamped and/or rounded. + /// I.e. after setting a value, reading the same setting back may return a different value. + /// + /// Equivalent to the TCP_KEEPCNT socket option. + /// + /// # Typical errors + /// - `invalid-argument`: (set) The provided value was 0. + @since(version = 0.2.0) + keep-alive-count: func() -> result; + @since(version = 0.2.0) + set-keep-alive-count: func(value: u32) -> result<_, error-code>; + /// Equivalent to the IP_TTL & IPV6_UNICAST_HOPS socket options. + /// + /// If the provided value is 0, an `invalid-argument` error is returned. + /// + /// # Typical errors + /// - `invalid-argument`: (set) The TTL value must be 1 or higher. + @since(version = 0.2.0) + hop-limit: func() -> result; + @since(version = 0.2.0) + set-hop-limit: func(value: u8) -> result<_, error-code>; + /// The kernel buffer space reserved for sends/receives on this socket. + /// + /// If the provided value is 0, an `invalid-argument` error is returned. + /// Any other value will never cause an error, but it might be silently clamped and/or rounded. + /// I.e. after setting a value, reading the same setting back may return a different value. + /// + /// Equivalent to the SO_RCVBUF and SO_SNDBUF socket options. + /// + /// # Typical errors + /// - `invalid-argument`: (set) The provided value was 0. + @since(version = 0.2.0) + receive-buffer-size: func() -> result; + @since(version = 0.2.0) + set-receive-buffer-size: func(value: u64) -> result<_, error-code>; + @since(version = 0.2.0) + send-buffer-size: func() -> result; + @since(version = 0.2.0) + set-send-buffer-size: func(value: u64) -> result<_, error-code>; + /// Create a `pollable` which can be used to poll for, or block on, + /// completion of any of the asynchronous operations of this socket. + /// + /// When `finish-bind`, `finish-listen`, `finish-connect` or `accept` + /// return `error(would-block)`, this pollable can be used to wait for + /// their success or failure, after which the method can be retried. + /// + /// The pollable is not limited to the async operation that happens to be + /// in progress at the time of calling `subscribe` (if any). Theoretically, + /// `subscribe` only has to be called once per socket and can then be + /// (re)used for the remainder of the socket's lifetime. + /// + /// See + /// for more information. + /// + /// Note: this function is here for WASI 0.2 only. + /// It's planned to be removed when `future` is natively supported in Preview3. + @since(version = 0.2.0) + subscribe: func() -> pollable; + /// Initiate a graceful shutdown. + /// + /// - `receive`: The socket is not expecting to receive any data from + /// the peer. The `input-stream` associated with this socket will be + /// closed. Any data still in the receive queue at time of calling + /// this method will be discarded. + /// - `send`: The socket has no more data to send to the peer. The `output-stream` + /// associated with this socket will be closed and a FIN packet will be sent. + /// - `both`: Same effect as `receive` & `send` combined. + /// + /// This function is idempotent; shutting down a direction more than once + /// has no effect and returns `ok`. + /// + /// The shutdown function does not close (drop) the socket. + /// + /// # Typical errors + /// - `invalid-state`: The socket is not in the `connected` state. (ENOTCONN) + /// + /// # References + /// - + /// - + /// - + /// - + @since(version = 0.2.0) + shutdown: func(shutdown-type: shutdown-type) -> result<_, error-code>; + } +} + +@since(version = 0.2.0) +interface tcp-create-socket { + @since(version = 0.2.0) + use network.{network, error-code, ip-address-family}; + @since(version = 0.2.0) + use tcp.{tcp-socket}; + + /// Create a new TCP socket. + /// + /// Similar to `socket(AF_INET or AF_INET6, SOCK_STREAM, IPPROTO_TCP)` in POSIX. + /// On IPv6 sockets, IPV6_V6ONLY is enabled by default and can't be configured otherwise. + /// + /// This function does not require a network capability handle. This is considered to be safe because + /// at time of creation, the socket is not bound to any `network` yet. Up to the moment `bind`/`connect` + /// is called, the socket is effectively an in-memory configuration object, unable to communicate with the outside world. + /// + /// All sockets are non-blocking. Use the wasi-poll interface to block on asynchronous operations. + /// + /// # Typical errors + /// - `not-supported`: The specified `address-family` is not supported. (EAFNOSUPPORT) + /// - `new-socket-limit`: The new socket resource could not be created because of a system limit. (EMFILE, ENFILE) + /// + /// # References + /// - + /// - + /// - + /// - + @since(version = 0.2.0) + create-tcp-socket: func(address-family: ip-address-family) -> result; +} + +@since(version = 0.2.0) +interface udp { + @since(version = 0.2.0) + use wasi:io/poll@0.2.2.{pollable}; + @since(version = 0.2.0) + use network.{network, error-code, ip-socket-address, ip-address-family}; + + /// A received datagram. + @since(version = 0.2.0) + record incoming-datagram { + /// The payload. + /// + /// Theoretical max size: ~64 KiB. In practice, typically less than 1500 bytes. + data: list, + /// The source address. + /// + /// This field is guaranteed to match the remote address the stream was initialized with, if any. + /// + /// Equivalent to the `src_addr` out parameter of `recvfrom`. + remote-address: ip-socket-address, + } + + /// A datagram to be sent out. + @since(version = 0.2.0) + record outgoing-datagram { + /// The payload. + data: list, + /// The destination address. + /// + /// The requirements on this field depend on how the stream was initialized: + /// - with a remote address: this field must be None or match the stream's remote address exactly. + /// - without a remote address: this field is required. + /// + /// If this value is None, the send operation is equivalent to `send` in POSIX. Otherwise it is equivalent to `sendto`. + remote-address: option, + } + + /// A UDP socket handle. + @since(version = 0.2.0) + resource udp-socket { + /// Bind the socket to a specific network on the provided IP address and port. + /// + /// If the IP address is zero (`0.0.0.0` in IPv4, `::` in IPv6), it is left to the implementation to decide which + /// network interface(s) to bind to. + /// If the port is zero, the socket will be bound to a random free port. + /// + /// # Typical errors + /// - `invalid-argument`: The `local-address` has the wrong address family. (EAFNOSUPPORT, EFAULT on Windows) + /// - `invalid-state`: The socket is already bound. (EINVAL) + /// - `address-in-use`: No ephemeral ports available. (EADDRINUSE, ENOBUFS on Windows) + /// - `address-in-use`: Address is already in use. (EADDRINUSE) + /// - `address-not-bindable`: `local-address` is not an address that the `network` can bind to. (EADDRNOTAVAIL) + /// - `not-in-progress`: A `bind` operation is not in progress. + /// - `would-block`: Can't finish the operation, it is still in progress. (EWOULDBLOCK, EAGAIN) + /// + /// # Implementors note + /// Unlike in POSIX, in WASI the bind operation is async. This enables + /// interactive WASI hosts to inject permission prompts. Runtimes that + /// don't want to make use of this ability can simply call the native + /// `bind` as part of either `start-bind` or `finish-bind`. + /// + /// # References + /// - + /// - + /// - + /// - + @since(version = 0.2.0) + start-bind: func(network: borrow, local-address: ip-socket-address) -> result<_, error-code>; + @since(version = 0.2.0) + finish-bind: func() -> result<_, error-code>; + /// Set up inbound & outbound communication channels, optionally to a specific peer. + /// + /// This function only changes the local socket configuration and does not generate any network traffic. + /// On success, the `remote-address` of the socket is updated. The `local-address` may be updated as well, + /// based on the best network path to `remote-address`. + /// + /// When a `remote-address` is provided, the returned streams are limited to communicating with that specific peer: + /// - `send` can only be used to send to this destination. + /// - `receive` will only return datagrams sent from the provided `remote-address`. + /// + /// This method may be called multiple times on the same socket to change its association, but + /// only the most recently returned pair of streams will be operational. Implementations may trap if + /// the streams returned by a previous invocation haven't been dropped yet before calling `stream` again. + /// + /// The POSIX equivalent in pseudo-code is: + /// ```text + /// if (was previously connected) { + /// connect(s, AF_UNSPEC) + /// } + /// if (remote_address is Some) { + /// connect(s, remote_address) + /// } + /// ``` + /// + /// Unlike in POSIX, the socket must already be explicitly bound. + /// + /// # Typical errors + /// - `invalid-argument`: The `remote-address` has the wrong address family. (EAFNOSUPPORT) + /// - `invalid-argument`: The IP address in `remote-address` is set to INADDR_ANY (`0.0.0.0` / `::`). (EDESTADDRREQ, EADDRNOTAVAIL) + /// - `invalid-argument`: The port in `remote-address` is set to 0. (EDESTADDRREQ, EADDRNOTAVAIL) + /// - `invalid-state`: The socket is not bound. + /// - `address-in-use`: Tried to perform an implicit bind, but there were no ephemeral ports available. (EADDRINUSE, EADDRNOTAVAIL on Linux, EAGAIN on BSD) + /// - `remote-unreachable`: The remote address is not reachable. (ECONNRESET, ENETRESET, EHOSTUNREACH, EHOSTDOWN, ENETUNREACH, ENETDOWN, ENONET) + /// - `connection-refused`: The connection was refused. (ECONNREFUSED) + /// + /// # References + /// - + /// - + /// - + /// - + @since(version = 0.2.0) + %stream: func(remote-address: option) -> result, error-code>; + /// Get the current bound address. + /// + /// POSIX mentions: + /// > If the socket has not been bound to a local name, the value + /// > stored in the object pointed to by `address` is unspecified. + /// + /// WASI is stricter and requires `local-address` to return `invalid-state` when the socket hasn't been bound yet. + /// + /// # Typical errors + /// - `invalid-state`: The socket is not bound to any local address. + /// + /// # References + /// - + /// - + /// - + /// - + @since(version = 0.2.0) + local-address: func() -> result; + /// Get the address the socket is currently streaming to. + /// + /// # Typical errors + /// - `invalid-state`: The socket is not streaming to a specific remote address. (ENOTCONN) + /// + /// # References + /// - + /// - + /// - + /// - + @since(version = 0.2.0) + remote-address: func() -> result; + /// Whether this is a IPv4 or IPv6 socket. + /// + /// Equivalent to the SO_DOMAIN socket option. + @since(version = 0.2.0) + address-family: func() -> ip-address-family; + /// Equivalent to the IP_TTL & IPV6_UNICAST_HOPS socket options. + /// + /// If the provided value is 0, an `invalid-argument` error is returned. + /// + /// # Typical errors + /// - `invalid-argument`: (set) The TTL value must be 1 or higher. + @since(version = 0.2.0) + unicast-hop-limit: func() -> result; + @since(version = 0.2.0) + set-unicast-hop-limit: func(value: u8) -> result<_, error-code>; + /// The kernel buffer space reserved for sends/receives on this socket. + /// + /// If the provided value is 0, an `invalid-argument` error is returned. + /// Any other value will never cause an error, but it might be silently clamped and/or rounded. + /// I.e. after setting a value, reading the same setting back may return a different value. + /// + /// Equivalent to the SO_RCVBUF and SO_SNDBUF socket options. + /// + /// # Typical errors + /// - `invalid-argument`: (set) The provided value was 0. + @since(version = 0.2.0) + receive-buffer-size: func() -> result; + @since(version = 0.2.0) + set-receive-buffer-size: func(value: u64) -> result<_, error-code>; + @since(version = 0.2.0) + send-buffer-size: func() -> result; + @since(version = 0.2.0) + set-send-buffer-size: func(value: u64) -> result<_, error-code>; + /// Create a `pollable` which will resolve once the socket is ready for I/O. + /// + /// Note: this function is here for WASI 0.2 only. + /// It's planned to be removed when `future` is natively supported in Preview3. + @since(version = 0.2.0) + subscribe: func() -> pollable; + } + + @since(version = 0.2.0) + resource incoming-datagram-stream { + /// Receive messages on the socket. + /// + /// This function attempts to receive up to `max-results` datagrams on the socket without blocking. + /// The returned list may contain fewer elements than requested, but never more. + /// + /// This function returns successfully with an empty list when either: + /// - `max-results` is 0, or: + /// - `max-results` is greater than 0, but no results are immediately available. + /// This function never returns `error(would-block)`. + /// + /// # Typical errors + /// - `remote-unreachable`: The remote address is not reachable. (ECONNRESET, ENETRESET on Windows, EHOSTUNREACH, EHOSTDOWN, ENETUNREACH, ENETDOWN, ENONET) + /// - `connection-refused`: The connection was refused. (ECONNREFUSED) + /// + /// # References + /// - + /// - + /// - + /// - + /// - + /// - + /// - + /// - + @since(version = 0.2.0) + receive: func(max-results: u64) -> result, error-code>; + /// Create a `pollable` which will resolve once the stream is ready to receive again. + /// + /// Note: this function is here for WASI 0.2 only. + /// It's planned to be removed when `future` is natively supported in Preview3. + @since(version = 0.2.0) + subscribe: func() -> pollable; + } + + @since(version = 0.2.0) + resource outgoing-datagram-stream { + /// Check readiness for sending. This function never blocks. + /// + /// Returns the number of datagrams permitted for the next call to `send`, + /// or an error. Calling `send` with more datagrams than this function has + /// permitted will trap. + /// + /// When this function returns ok(0), the `subscribe` pollable will + /// become ready when this function will report at least ok(1), or an + /// error. + /// + /// Never returns `would-block`. + check-send: func() -> result; + /// Send messages on the socket. + /// + /// This function attempts to send all provided `datagrams` on the socket without blocking and + /// returns how many messages were actually sent (or queued for sending). This function never + /// returns `error(would-block)`. If none of the datagrams were able to be sent, `ok(0)` is returned. + /// + /// This function semantically behaves the same as iterating the `datagrams` list and sequentially + /// sending each individual datagram until either the end of the list has been reached or the first error occurred. + /// If at least one datagram has been sent successfully, this function never returns an error. + /// + /// If the input list is empty, the function returns `ok(0)`. + /// + /// Each call to `send` must be permitted by a preceding `check-send`. Implementations must trap if + /// either `check-send` was not called or `datagrams` contains more items than `check-send` permitted. + /// + /// # Typical errors + /// - `invalid-argument`: The `remote-address` has the wrong address family. (EAFNOSUPPORT) + /// - `invalid-argument`: The IP address in `remote-address` is set to INADDR_ANY (`0.0.0.0` / `::`). (EDESTADDRREQ, EADDRNOTAVAIL) + /// - `invalid-argument`: The port in `remote-address` is set to 0. (EDESTADDRREQ, EADDRNOTAVAIL) + /// - `invalid-argument`: The socket is in "connected" mode and `remote-address` is `some` value that does not match the address passed to `stream`. (EISCONN) + /// - `invalid-argument`: The socket is not "connected" and no value for `remote-address` was provided. (EDESTADDRREQ) + /// - `remote-unreachable`: The remote address is not reachable. (ECONNRESET, ENETRESET on Windows, EHOSTUNREACH, EHOSTDOWN, ENETUNREACH, ENETDOWN, ENONET) + /// - `connection-refused`: The connection was refused. (ECONNREFUSED) + /// - `datagram-too-large`: The datagram is too large. (EMSGSIZE) + /// + /// # References + /// - + /// - + /// - + /// - + /// - + /// - + /// - + /// - + @since(version = 0.2.0) + send: func(datagrams: list) -> result; + /// Create a `pollable` which will resolve once the stream is ready to send again. + /// + /// Note: this function is here for WASI 0.2 only. + /// It's planned to be removed when `future` is natively supported in Preview3. + @since(version = 0.2.0) + subscribe: func() -> pollable; + } +} + +@since(version = 0.2.0) +interface udp-create-socket { + @since(version = 0.2.0) + use network.{network, error-code, ip-address-family}; + @since(version = 0.2.0) + use udp.{udp-socket}; + + /// Create a new UDP socket. + /// + /// Similar to `socket(AF_INET or AF_INET6, SOCK_DGRAM, IPPROTO_UDP)` in POSIX. + /// On IPv6 sockets, IPV6_V6ONLY is enabled by default and can't be configured otherwise. + /// + /// This function does not require a network capability handle. This is considered to be safe because + /// at time of creation, the socket is not bound to any `network` yet. Up to the moment `bind` is called, + /// the socket is effectively an in-memory configuration object, unable to communicate with the outside world. + /// + /// All sockets are non-blocking. Use the wasi-poll interface to block on asynchronous operations. + /// + /// # Typical errors + /// - `not-supported`: The specified `address-family` is not supported. (EAFNOSUPPORT) + /// - `new-socket-limit`: The new socket resource could not be created because of a system limit. (EMFILE, ENFILE) + /// + /// # References: + /// - + /// - + /// - + /// - + @since(version = 0.2.0) + create-udp-socket: func(address-family: ip-address-family) -> result; +} + +@since(version = 0.2.0) +world imports { + @since(version = 0.2.0) + import network; + @since(version = 0.2.0) + import instance-network; + @since(version = 0.2.0) + import wasi:io/poll@0.2.2; + @since(version = 0.2.0) + import udp; + @since(version = 0.2.0) + import udp-create-socket; + @since(version = 0.2.0) + import wasi:io/error@0.2.2; + @since(version = 0.2.0) + import wasi:io/streams@0.2.2; + @since(version = 0.2.0) + import wasi:clocks/monotonic-clock@0.2.2; + @since(version = 0.2.0) + import tcp; + @since(version = 0.2.0) + import tcp-create-socket; + @since(version = 0.2.0) + import ip-name-lookup; +} diff --git a/examples/components/string-reverse-upper/package-lock.json b/examples/components/string-reverse-upper/package-lock.json index 10880ebff..51895ecd8 100644 --- a/examples/components/string-reverse-upper/package-lock.json +++ b/examples/components/string-reverse-upper/package-lock.json @@ -1,43 +1,43 @@ { - "name": "reverser-wasm", + "name": "string-reverse-upper-wasm", "lockfileVersion": 3, "requires": true, "packages": { "": { - "name": "reverser-wasm", + "name": "string-reverse-upper-wasm", "devDependencies": { - "@bytecodealliance/componentize-js": "0.13.0", - "@bytecodealliance/jco": "1.7.0" + "@bytecodealliance/componentize-js": "0.15.0", + "@bytecodealliance/jco": "1.8.1" } }, "node_modules/@bytecodealliance/componentize-js": { - "version": "0.13.0", - "resolved": "https://registry.npmjs.org/@bytecodealliance/componentize-js/-/componentize-js-0.13.0.tgz", - "integrity": "sha512-SBmuSiw2CQTBnmE5+944ujFG9VykovteE2q5XLsTblJgey67TAxrIjlLsygDypFbi2JUGNJJ6t9Y0HSarBgKxQ==", + "version": "0.15.0", + "resolved": "https://registry.npmjs.org/@bytecodealliance/componentize-js/-/componentize-js-0.15.0.tgz", + "integrity": "sha512-NyMsXJi4LxeGGYwmZR5c8Zq69scTgTmaXUOXeC4IDvDoLNz5qZdBqC8gjZnsqvRq69QFM2Hd3Xweb5P5AyEOGA==", "dev": true, "workspaces": [ "." ], "dependencies": { - "@bytecodealliance/jco": "^1.5.0", - 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