Disable metadata service detection in the emulator.

CHANGELOG.md

@@ -0,0 +1 @@
+Inject an environment variable in the node functions emulator to tell the google-gax SDK not to look for the metadata service. (#6860)

src/emulator/functionsEmulator.ts

@@ -271,7 +271,7 @@
   createHubServer(): express.Application {
     // TODO(samstern): Should not need this here but some tests are directly calling this method
     // because FunctionsEmulator.start() used to not be test safe.
     this.workQueue.start();
 
     const hub = express();
 
@@ -313,15 +313,15 @@
     const multicastHandler: express.RequestHandler = (req: express.Request, res) => {
       const projectId = req.params.project_id;
       const rawBody = (req as RequestWithRawBody).rawBody;
       const event = JSON.parse(rawBody.toString());
       let triggerKey: string;
       if (req.headers["content-type"]?.includes("cloudevent")) {
         triggerKey = `${this.args.projectId}:${event.type}`;
       } else {
         triggerKey = `${this.args.projectId}:${event.eventType}`;
       }
       if (event.data.bucket) {
         triggerKey += `:${event.data.bucket}`;
       }
       const triggers = this.multicastTriggers[triggerKey] || [];
 
@@ -366,7 +366,7 @@
     return hub;
   }
 
   async sendRequest(trigger: EmulatedTriggerDefinition, body?: any) {
     const record = this.getTriggerRecordByKey(this.getTriggerKey(trigger));
     const pool = this.workerPools[record.backend.codebase];
     if (!pool.readyForWork(trigger.id)) {
@@ -1349,6 +1349,7 @@
       cwd: backend.functionsDir,
       env: {
         node: backend.bin,
+        METADATA_SERVER_DETECTION: "none",
         ...process.env,
         ...envs,
         PORT: socketPath,
@@ -1451,7 +1452,6 @@
   /**
    * Gets the address of a running emulator, either from explicit args or by
    * consulting the emulator registry.
-   *
    * @param emulator
    */
   private getEmulatorInfo(emulator: Emulators): EmulatorInfo | undefined {