Imported from gurdasnijor/firegrid (repos/sdk-typescript/.claude/skills/update-sdk-test-contracts/SKILL.md). Install upstream with npx skills add gurdasnijor/firegrid --skill update-sdk-test-contracts. Copyright stays with the author.

Updating SDK Test Service Implementations to a New Contract Version

The conformance test suite (restatedev/e2e) defines contracts that every SDK must implement. When the contracts change, both service implementations in this repo must be updated.

Step 1: Read the release notes

The user will provide a release tag (e.g. v1.2.3). Fetch the GitHub release to understand what changed:

gh release view v1.2.3 --repo restatedev/e2e

Read the release body carefully — it describes which contract interfaces changed, what new commands/handlers were added, and what was removed. This tells you exactly what to implement.

Step 2: Identify the two service implementations to update

Both live in this repo:

The key files are:

• virtual_object_command_interpreter.ts / vo-command-interpreter.ts — implements VirtualObjectCommandInterpreter
• test_utils.ts / test-utils.ts — implements TestUtilsService

Other services (awakeable-holder, failing, counter, etc.) rarely change.

Step 3: Understand the contract types

The contracts (Kotlin interfaces) in restatedev/e2e define:

• Serialized type names: every command/handler is identified by its @SerialName("camelCase") string, which becomes the type discriminator in JSON
• Field names: Kotlin camelCase fields map directly to JSON — match them exactly
• Return value conventions for VirtualObjectCommandInterpreter:
  • AwaitOne / AwaitAny / AwaitFirstCompleted / AwaitFirstSucceededOrAllFailed → return the resolved string value; Sleep returns "sleep"
  • AwaitAllSucceededOrFirstFailed → pipe-joined values: "val0|val1|val2"; throws on first failure
  • AwaitAllCompleted → pipe-joined settled results: "ok:val0|err:reason|ok:val2"

Step 4: Update the main e2e services (packages/tests/restate-e2e-services/src/)

These use the standard async/await Restate SDK. Patterns:

New AwaitableCommand sub-type (e.g. createSignal):

// Add to the SubCommand union type and parseAwaitableCommand switch:
case "createSignal": {
  const ctxInternal = ctx as unknown as restate.internal.ContextInternal;
  return ctxInternal.signal<string>(command.signalName);  // returns RestatePromise<string>
}

New Command combinator (e.g. awaitAllCompleted):

// Add to the Command union type and interpretCommands switch:
case "awaitAllCompleted": {
  const settled = await RestatePromise.allSettled(
    command.commands.map((cmd) => parseAwaitableCommand(ctx, cmd))
  );
  lastResult = settled
    .map((r) => r.status === "fulfilled" ? `ok:${r.value}` : `err:${(r.reason as Error).message}`)
    .join("|");
  break;
}

New TestUtilsService handler (e.g. resolveSignal):

resolveSignal(
  ctx: restate.Context,
  req: { invocationId: string; signalName: string; value: string }
): Promise<void> {
  const ctxInternal = ctx as unknown as restate.internal.ContextInternal;
  ctxInternal
    .invocation(restate.InvocationIdParser.fromString(req.invocationId))
    .signal(req.signalName)
    .resolve(req.value);
  return Promise.resolve();
},

Signals use the internal ContextInternal API — always cast with as unknown as restate.internal.ContextInternal (double cast required; direct cast from ObjectContext is rejected by tsc).

Step 5: Update the gen test services (packages/libs/restate-sdk-gen/test-services/src/)

These use generator functions. The gen SDK exports: all, allSettled, any, race, signal, invocation, sleep, run, awakeable, select, state, sharedState.

New AwaitableCommand sub-type (e.g. createSignal):

case "createSignal":
  return { kind: "awakeable", future: signal<string>(cmd.signalName) };

New Command combinator (e.g. awaitAllCompleted):

case "awaitAllCompleted": {
  const subs: SubEntry[] = [];
  for (const c of cmd.commands) subs.push(yield* createSub(c));
  const settled = (yield* allSettled(subs.map((s) => s.future))) as FutureSettledResult<unknown>[];
  result = settled
    .map((r, i) =>
      r.status === "rejected"
        ? `err:${(r.reason as Error).message}`
        : `ok:${valueToString(r.value, subs[i]!.kind)}`
    )
    .join("|");
  break;
}

IMPORTANT — do NOT use spawn for multi-future combinators: spawn creates a structured child fiber, and the parent handler waits for ALL spawned children before completing. For race/any, this means a pending signal fiber would prevent the handler from ever returning. Pass the futures directly to all/allSettled/any/race.

New TestUtilsService handler (e.g. resolveSignal):

*resolveSignal(req: { invocationId: string; signalName: string; value: string }) {
  invocation(req.invocationId).signal(req.signalName).resolve(req.value);
},

Step 6: Build and verify

# Type-check both packages
pnpm --filter restate-e2e-services run _check:types
pnpm --filter restate-sdk-gen build

# Build Docker images (from repo root)
podman build -t e2e-ts:local -f packages/tests/restate-e2e-services/Dockerfile .
podman build -t e2e-ts-gen:local -f packages/libs/restate-sdk-gen/test-services/Dockerfile .

# Run the affected test classes against both images (from ../e2e)
cd ../e2e
./gradlew :sdk-tests:run --args='run --sequential --image-pull-policy=CACHED --test-suite=default --test-name=<TestClass> --service-container-image=localhost/e2e-ts:local'
./gradlew :sdk-tests:run --args='run --sequential --image-pull-policy=CACHED --test-suite=default --test-name=<TestClass> --service-container-image=localhost/e2e-ts-gen:local'

All tests must pass on both images before the update is complete.