Update SDK for new deployment spec (#97)

- Use new environment variable names and defaults
- Remove configuration server
- Pass `PathBuf` to `validate_raw_configuration` and remove `RawConfiguration`
- Update `Dockerfile` to meet the deployment spec

Co-authored-by: Samir Talwar <[email protected]>

Dockerfile

@@ -16,6 +16,11 @@ COPY ./rust-connector-sdk .
 RUN cargo build --release
 
 FROM debian:buster-slim as connector
+RUN set -ex; \
+    apt-get update; \
+    DEBIAN_FRONTEND=noninteractive \
+      apt-get install --no-install-recommends --assume-yes \
+      libssl-dev
 COPY --from=build /app/target/release/ndc_hub_example ./ndc_hub_example
 ENTRYPOINT [ "/ndc_hub_example" ]
-CMD [ "serve", "--port", "8080" ]
+CMD [ "serve", "--configuration", "/etc/connector" ]

rust-connector-sdk/src/connector.rs

@@ -1,4 +1,4 @@
-use std::error::Error;
+use std::{error::Error, path::Path};
 
 use async_trait::async_trait;
 use ndc_client::models;
@@ -32,16 +32,6 @@ pub enum KeyOrIndex {
     Index(u32),
 }
 
-/// Errors which occur when trying to validate connector
-/// configuration.
-///
-/// See [`Connector::update_configuration`].
-#[derive(Debug, Error)]
-pub enum UpdateConfigurationError {
-    #[error("error validating configuration: {0}")]
-    Other(#[from] Box<dyn Error + Send + Sync>),
-}
-
 /// Errors which occur when trying to initialize connector
 /// state.
 ///
@@ -201,23 +191,15 @@ pub enum MutationError {
 /// connection string would be state.
 #[async_trait]
 pub trait Connector {
-    /// The type of unvalidated, raw configuration, as provided by the user.
-    type RawConfiguration: Sync + Send;
     /// The type of validated configuration
     type Configuration: Sync + Send;
     /// The type of unserializable state
     type State: Sync + Send;
 
-    fn make_empty_configuration() -> Self::RawConfiguration;
-
-    async fn update_configuration(
-        config: Self::RawConfiguration,
-    ) -> Result<Self::RawConfiguration, UpdateConfigurationError>;
-
     /// Validate the raw configuration provided by the user,
     /// returning a configuration error or a validated [`Connector::Configuration`].
-    async fn validate_raw_configuration(
-        configuration: Self::RawConfiguration,
+    async fn parse_configuration(
+        configuration_dir: impl AsRef<Path> + Send,
     ) -> Result<Self::Configuration, ValidateError>;
 
     /// Initialize the connector's in-memory state.

rust-connector-sdk/src/connector/example.rs

@@ -11,20 +11,11 @@ pub struct Example {}
 
 #[async_trait]
 impl Connector for Example {
-    type RawConfiguration = ();
     type Configuration = ();
     type State = ();
 
-    fn make_empty_configuration() -> Self::RawConfiguration {}
-
-    async fn update_configuration(
-        _config: Self::RawConfiguration,
-    ) -> Result<Self::RawConfiguration, UpdateConfigurationError> {
-        Ok(())
-    }
-
-    async fn validate_raw_configuration(
-        _configuration: Self::Configuration,
+    async fn parse_configuration(
+        _configuration_dir: impl AsRef<Path> + Send,
     ) -> Result<Self::Configuration, ValidateError> {
         Ok(())
     }