fix: add metrics for agentkeepalive

package.json

@@ -55,9 +55,9 @@
     "conventional-changelog-conventionalcommits": "^5.0.0",
     "crypto-js": "^4.2.0",
     "dotenv": "^16.0.0",
-    "fastify": "^4.8.1",
+    "fastify": "^4.28.1",
     "fastify-metrics": "^10.2.0",
-    "fastify-plugin": "^4.0.0",
+    "fastify-plugin": "^4.5.1",
     "fastify-xml-body-parser": "^2.2.0",
     "fs-extra": "^10.0.1",
     "fs-xattr": "0.3.1",
@@ -113,7 +113,7 @@
     "ts-node-dev": "^1.1.8",
     "tsx": "^4.16.0",
     "tus-js-client": "^3.1.0",
-    "typescript": "^4.5.5"
+    "typescript": "^5.6.2"
   },
   "bin": "./dist/server.js"
 }

src/http/plugins/storage.ts

@@ -17,7 +17,7 @@ const storageBackend = createStorageBackend(storageBackendType)
 
 export const storage = fastifyPlugin(
   async function storagePlugin(fastify) {
-    fastify.decorateRequest('storage', undefined)
+    fastify.decorateRequest('storage', null)
     fastify.addHook('preHandler', async (request) => {
       const database = new StorageKnexDB(request.db, {
         tenantId: request.tenantId,

src/http/routes/object/deleteObject.ts

@@ -1,5 +1,5 @@
 import { FastifyInstance } from 'fastify'
-import { FromSchema, JSONSchema } from 'json-schema-to-ts'
+import { FromSchema } from 'json-schema-to-ts'
 import { createDefaultSchema, createResponse } from '../../routes-helper'
 import { AuthenticatedRequest } from '../../types'
 import { ROUTE_OPERATIONS } from '../operations'

src/http/routes/object/updateObject.ts

@@ -77,6 +77,7 @@ export default async function routes(fastify: FastifyInstance) {
         .uploadOverridingObject(request, {
           owner,
           objectName: objectName,
+          signal: request.signals.body.signal,
         })
 
       return response.status(objectMetadata?.httpStatusCode ?? 200).send({

src/http/routes/object/uploadSignedObject.ts

@@ -94,6 +94,7 @@ export default async function routes(fastify: FastifyInstance) {
           owner,
           objectName,
           isUpsert: upsert,
+          signal: request.signals.body.signal,
         })
 
       return response.status(objectMetadata?.httpStatusCode ?? 200).send({

src/http/routes/s3/commands/upload-part.ts

@@ -97,16 +97,19 @@ export default function UploadPart(s3Router: S3Router) {
 
       const metadata = s3Protocol.parseMetadataHeaders(req.Headers)
 
-      return s3Protocol.putObject({
-        Body: ctx.req as any,
-        Bucket: req.Params.Bucket,
-        Key: req.Params['*'],
-        CacheControl: req.Headers?.['cache-control'],
-        ContentType: req.Headers?.['content-type'],
-        Expires: req.Headers?.['expires'] ? new Date(req.Headers?.['expires']) : undefined,
-        ContentEncoding: req.Headers?.['content-encoding'],
-        Metadata: metadata,
-      })
+      return s3Protocol.putObject(
+        {
+          Body: ctx.req as any,
+          Bucket: req.Params.Bucket,
+          Key: req.Params['*'],
+          CacheControl: req.Headers?.['cache-control'],
+          ContentType: req.Headers?.['content-type'],
+          Expires: req.Headers?.['expires'] ? new Date(req.Headers?.['expires']) : undefined,
+          ContentEncoding: req.Headers?.['content-encoding'],
+          Metadata: metadata,
+        },
+        ctx.signals.body
+      )
     }
   )
 }

src/http/routes/tus/index.ts

@@ -59,7 +59,7 @@ type MultiPartRequest = http.IncomingMessage & {
 
 function createTusStore() {
   if (storageBackendType === 's3') {
-    const agent = createAgent(storageS3Endpoint?.includes('http://') ? 'http' : 'https')
+    const agent = createAgent('s3_tus')
     return new S3Store({
       partSize: tusPartSize * 1024 * 1024, // Each uploaded part will have ${tusPartSize}MB,
       expirationPeriodInMilliseconds: tusUrlExpiryMs,

src/internal/monitoring/metrics.ts

@@ -68,3 +68,28 @@ export const DbActiveConnection = new client.Gauge({
   help: 'Number of database connections',
   labelNames: ['region', 'is_external'],
 })
+
+// Create Prometheus metrics
+export const HttpPoolSocketsGauge = new client.Gauge({
+  name: 'storage_api_http_pool_busy_sockets',
+  help: 'Number of busy sockets currently in use',
+  labelNames: ['name', 'region', 'protocol'],
+})
+
+export const HttpPoolFreeSocketsGauge = new client.Gauge({
+  name: 'storage_api_http_pool_free_sockets',
+  help: 'Number of free sockets available for reuse',
+  labelNames: ['name', 'region', 'protocol'],
+})
+
+export const HttpPoolPendingRequestsGauge = new client.Gauge({
+  name: 'storage_api_http_pool_requests',
+  help: 'Number of pending requests waiting for a socket',
+  labelNames: ['name', 'region', 'protocol'],
+})
+
+export const HttpPoolErrorGauge = new client.Gauge({
+  name: 'storage_api_http_pool_errors',
+  help: 'Number of pending requests waiting for a socket',
+  labelNames: ['name', 'region', 'type', 'protocol'],
+})

src/internal/monitoring/otel.ts

@@ -31,6 +31,7 @@ import { S3Backend } from '@storage/backend'
 import { StorageKnexDB } from '@storage/database'
 import { TenantConnection } from '@internal/database'
 import { S3Store } from '@tus/s3-store'
+import { Upload } from '@aws-sdk/lib-storage'
 
 const tracingEnabled = process.env.TRACING_ENABLED === 'true'
 const headersEnv = process.env.OTEL_EXPORTER_OTLP_TRACES_HEADERS || ''
@@ -239,6 +240,11 @@ const sdk = new NodeSDK({
       },
       setName: (name, attrs) => 'S3.' + attrs.operation,
     }),
+    new ClassInstrumentation({
+      targetClass: Upload,
+      enabled: true,
+      methodsToInstrument: ['done', '__notifyProgress'],
+    }),
     getNodeAutoInstrumentations({
       '@opentelemetry/instrumentation-http': {
         enabled: false,

src/storage/backend/adapter.ts

@@ -82,7 +82,8 @@ export abstract class StorageBackendAdapter {
     version: string | undefined,
     body: NodeJS.ReadableStream,
     contentType: string,
-    cacheControl: string
+    cacheControl: string,
+    signal?: AbortSignal
   ): Promise<ObjectMetadata> {
     throw new Error('uploadObject not implemented')
   }
@@ -172,7 +173,8 @@ export abstract class StorageBackendAdapter {
     uploadId: string,
     partNumber: number,
     body?: string | Uint8Array | Buffer | Readable,
-    length?: number
+    length?: number,
+    signal?: AbortSignal
   ): Promise<{ ETag?: string }> {
     throw new Error('not implemented')
   }

src/storage/backend/s3.ts

@@ -30,23 +30,91 @@ import { ERRORS, StorageBackendError } from '@internal/errors'
 import { getConfig } from '../../config'
 import Agent, { HttpsAgent } from 'agentkeepalive'
 import { Readable } from 'stream'
+import {
+  HttpPoolErrorGauge,
+  HttpPoolFreeSocketsGauge,
+  HttpPoolPendingRequestsGauge,
+  HttpPoolSocketsGauge,
+} from '@internal/monitoring/metrics'
+
+const { storageS3MaxSockets, region } = getConfig()
+
+const watchers: NodeJS.Timeout[] = []
 
-const { storageS3MaxSockets } = getConfig()
+process.once('SIGTERM', () => {
+  watchers.forEach((watcher) => {
+    clearInterval(watcher)
+  })
+})
 
 /**
  * Creates an agent for the given protocol
- * @param protocol
+ * @param name
  */
-export function createAgent(protocol: 'http' | 'https') {
+export function createAgent(name: string) {
   const agentOptions = {
     maxSockets: storageS3MaxSockets,
     keepAlive: true,
     keepAliveMsecs: 1000,
+    freeSocketTimeout: 1000 * 15,
+  }
+
+  const httpAgent = new Agent(agentOptions)
+  const httpsAgent = new HttpsAgent(agentOptions)
+
+  if (httpsAgent) {
+    const watcher = setInterval(() => {
+      const httpStatus = httpAgent.getCurrentStatus()
+      const httpsStatus = httpsAgent.getCurrentStatus()
+      updateHttpPoolMetrics(name, 'http', httpStatus)
+      updateHttpPoolMetrics(name, 'https', httpsStatus)
+    }, 5000)
+
+    watchers.push(watcher)
+  }
+
+  return { httpAgent, httpsAgent }
+}
+
+// Function to update Prometheus metrics based on the current status of the agent
+function updateHttpPoolMetrics(name: string, protocol: string, status: Agent.AgentStatus): void {
+  // Calculate the number of busy sockets by iterating over the `sockets` object
+  let busySocketCount = 0
+  for (const host in status.sockets) {
+    if (status.sockets.hasOwnProperty(host)) {
+      busySocketCount += status.sockets[host]
+    }
   }
 
-  return protocol === 'http'
-    ? { httpAgent: new Agent(agentOptions) }
-    : { httpsAgent: new HttpsAgent(agentOptions) }
+  // Calculate the number of free sockets by iterating over the `freeSockets` object
+  let freeSocketCount = 0
+  for (const host in status.freeSockets) {
+    if (status.freeSockets.hasOwnProperty(host)) {
+      freeSocketCount += status.freeSockets[host]
+    }
+  }
+
+  // Calculate the number of pending requests by iterating over the `requests` object
+  let pendingRequestCount = 0
+  for (const host in status.requests) {
+    if (status.requests.hasOwnProperty(host)) {
+      pendingRequestCount += status.requests[host]
+    }
+  }
+
+  // Update the metrics with calculated values
+  HttpPoolSocketsGauge.set({ name, region, protocol }, busySocketCount)
+  HttpPoolFreeSocketsGauge.set({ name, region, protocol }, freeSocketCount)
+  HttpPoolPendingRequestsGauge.set({ name, region }, pendingRequestCount)
+  HttpPoolErrorGauge.set({ name, region, type: 'socket_error', protocol }, status.errorSocketCount)
+  HttpPoolErrorGauge.set(
+    { name, region, type: 'timeout_socket_error', protocol },
+    status.timeoutSocketCount
+  )
+  HttpPoolErrorGauge.set(
+    { name, region, type: 'create_socket_error', protocol },
+    status.createSocketErrorCount
+  )
 }
 
 export interface S3ClientOptions {
@@ -56,7 +124,7 @@ export interface S3ClientOptions {
   accessKey?: string
   secretKey?: string
   role?: string
-  httpAgent?: { httpAgent: Agent } | { httpsAgent: HttpsAgent }
+  httpAgent?: { httpAgent: Agent; httpsAgent: HttpsAgent }
   requestTimeout?: number
   downloadTimeout?: number
   uploadTimeout?: number
@@ -75,18 +143,21 @@ export class S3Backend implements StorageBackendAdapter {
     // Default client for API operations
     this.client = this.createS3Client({
       ...options,
+      name: 's3_default',
       requestTimeout: options.requestTimeout,
     })
 
     // Upload client exclusively for upload operations
     this.uploadClient = this.createS3Client({
       ...options,
+      name: 's3_upload',
       requestTimeout: options.uploadTimeout,
     })
 
     // Download client exclusively for download operations
     this.downloadClient = this.createS3Client({
       ...options,
+      name: 's3_download',
       requestTimeout: options.downloadTimeout,
     })
   }
@@ -144,14 +215,16 @@ export class S3Backend implements StorageBackendAdapter {
    * @param body
    * @param contentType
    * @param cacheControl
+   * @param signal
    */
   async uploadObject(
     bucketName: string,
     key: string,
     version: string | undefined,
     body: NodeJS.ReadableStream,
     contentType: string,
-    cacheControl: string
+    cacheControl: string,
+    signal?: AbortSignal
   ): Promise<ObjectMetadata> {
     try {
       const paralellUploadS3 = new Upload({
@@ -166,6 +239,14 @@ export class S3Backend implements StorageBackendAdapter {
         },
       })
 
+      signal?.addEventListener(
+        'abort',
+        () => {
+          paralellUploadS3.abort()
+        },
+        { once: true }
+      )
+
       const data = (await paralellUploadS3.done()) as CompleteMultipartUploadCommandOutput
 
       const metadata = await this.headObject(bucketName, key, version)
@@ -451,10 +532,8 @@ export class S3Backend implements StorageBackendAdapter {
     }
   }
 
-  protected createS3Client(options: S3ClientOptions) {
-    const storageS3Protocol = options.endpoint?.includes('http://') ? 'http' : 'https'
-
-    const agent = options.httpAgent ? options.httpAgent : createAgent(storageS3Protocol)
+  protected createS3Client(options: S3ClientOptions & { name: string }) {
+    const agent = options.httpAgent ?? createAgent(options.name)
 
     const params: S3ClientConfig = {
       region: options.region,

src/storage/events/base-event.ts

@@ -5,10 +5,11 @@ import { createAgent, createStorageBackend } from '../backend'
 import { Storage } from '../storage'
 import { getConfig } from '../../config'
 import { logger } from '@internal/monitoring'
+import Agent, { HttpsAgent } from 'agentkeepalive'
 
-const { storageBackendType, storageS3Endpoint, region } = getConfig()
-const storageS3Protocol = storageS3Endpoint?.includes('http://') ? 'http' : 'https'
-const httpAgent = createAgent(storageS3Protocol)
+const { storageBackendType, region } = getConfig()
+
+let httpAgent: { httpAgent: Agent; httpsAgent: HttpsAgent } | undefined
 
 export abstract class BaseEvent<T extends Omit<BasePayload, '$version'>> extends QueueBaseEvent<T> {
   /**
@@ -51,6 +52,14 @@ export abstract class BaseEvent<T extends Omit<BasePayload, '$version'>> extends
     }
   }
 
+  protected static getAgent() {
+    if (httpAgent) {
+      return httpAgent
+    }
+    httpAgent = createAgent('s3_worker')
+    return httpAgent
+  }
+
   protected static async createStorage(payload: BasePayload) {
     const adminUser = await getServiceKeyUser(payload.tenant.ref)
 
@@ -68,7 +77,7 @@ export abstract class BaseEvent<T extends Omit<BasePayload, '$version'>> extends
     })
 
     const storageBackend = createStorageBackend(storageBackendType, {
-      httpAgent,
+      httpAgent: BaseEvent.getAgent(),
     })
 
     return new Storage(storageBackend, db)

src/storage/object.ts

@@ -23,6 +23,7 @@ export interface UploadObjectOptions {
   owner?: string
   isUpsert?: boolean
   version?: string
+  signal?: AbortSignal
 }
 
 const { requestUrlLengthLimit, storageS3Bucket } = getConfig()