Add Google Cloud Run worker identity/deployment helper - #3028
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Adds an experimental Google Cloud Run helper, mirroring the existing AWS Lambda module's worker-ID behavior. Because Cloud Run runs a long-lived container (unlike Lambda's per-invocation model), this is a metadata helper rather than a worker wrapper: it reads the Cloud Run instance metadata -- the instance id from the metadata server, plus the worker pool/service name and revision from CLOUD_RUN_WORKER_POOL / CLOUD_RUN_REVISION (worker pools) or K_SERVICE / K_REVISION (services) -- and derives a worker identity and a WorkerDeploymentVersion to apply to a normal long-lived worker. Covers both Cloud Run worker pools and services. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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What & why
The Java SDK already ships an AWS Lambda contrib module (
contrib/temporal-aws-lambda) that sets the worker "ID" for Lambda. This adds the equivalent capability for Google Cloud Run, covering both Cloud Run worker pools and services.Cloud Run runs a long-lived container, so — unlike Lambda's per-invocation handler — there is nothing to wrap. This PR adds a small metadata helper module
contrib/temporal-gcp-cloud-run(registered insettings.gradle, mirroring the Lambda module). It's marked@Experimental.What it does
GoogleCloudRunMetadata.fetch(), called once at worker startup:CLOUD_RUN_WORKER_POOL(worker pools) →K_SERVICE(services), and the revision fromCLOUD_RUN_REVISION→K_REVISION, andhttp://metadata.google.internal/computeMetadata/v1/instance/id, headerMetadata-Flavor: Google) for the unique instance id (available on both worker pools and services).It returns a
GoogleCloudRunMetadatawith fluentapplyTo(...)overloads you drop into your normal, long-lived worker:metadata.applyTo(WorkflowClientOptions.newBuilder())→ sets identity to<instanceId>@<revision>; andmetadata.applyTo(WorkerOptions.newBuilder())→ enables Worker Deployment Versioning withnew WorkerDeploymentVersion(<name>, <revision>).(
workerIdentity()/workerDeploymentVersion()accessors are also exposed.)Notes
GoogleCloudRun-style, "apply defaults to your options",@Experimental) intentionally mirrors the coordinated Google Cloud Run effort already visible in the .NET SDK (Temporalio.Extensions.Gcp.CloudRun.OpenTelemetry).compileOnly project(':temporal-sdk')plus the JDK'sHttpURLConnection(Java 8-compatible)../gradlewin my environment — only JDK 25 is installed, and the repo's pinned Gradle 8.10.2 cannot compile build scripts on JDK 25 (no JDK 21/23 available, and I did not install one). The source was verified by compiling standalone with the SDK's exact--release 8 -Werrorflags against stubs (clean), by checking every temporal-sdk API symbol used against the real sources, and by manually checking google-java-format compliance. Please run./gradlew :temporal-gcp-cloud-run:spotlessApply :temporal-gcp-cloud-run:compileJavaon a supported JDK before un-drafting.🤖 Generated with Claude Code