feat(gateway): add Status RPC to look up request status by sqid

[albertywu]

Summary

Adds a Status RPC to the gateway that returns the current status of a previously submitted request, reconciled from the append-only request log via core/request.GetCurrentStateFromRequestLog.

Decision was made to name this Status instead of something like GetRequestStatus to abide by pre-existing naming patterns in this repo (prefers short names like Land, Ping, etc).

Test Plan

✅make test && make fmt && make lint
✅ Integration tests w/ make local-gateway-start

PORT=$(docker port submitqueue-gateway-service-1 8080 | head -1 | cut -d: -f2)

# method is registered
grpcurl -plaintext localhost:$PORT list uber.submitqueue.gateway.SubmitQueueGateway
  -> Land, Ping, Status

# seed a request
grpcurl -plaintext -d '{"queue":"test-queue","change":{"uris":["github:///pull/123/c3a4d5e6f7890123456789abcdef0123456789ab"]}}' \
  localhost:$PORT uber.submitqueue.gateway.SubmitQueueGateway/Land
  -> { "sqid": "test-queue/1" }

# happy path
grpcurl -plaintext -d '{"sqid":"test-queue/1"}' \
  localhost:$PORT uber.submitqueue.gateway.SubmitQueueGateway/Status
  -> { "status": "accepted" }

# unknown sqid
grpcurl -plaintext -d '{"sqid":"test-queue/999"}' \
  localhost:$PORT uber.submitqueue.gateway.SubmitQueueGateway/Status
  -> ERROR: request not found for sqid "test-queue/999"

# empty sqid
grpcurl -plaintext -d '{"sqid":""}' \
  localhost:$PORT uber.submitqueue.gateway.SubmitQueueGateway/Status
  -> ERROR: StatusController requires the request to have a sqid specified: invalid request

Issues

Stack

1. @ feat(gateway): add Status RPC to look up request status by sqid #164
2. build(proto): use prebuilt protoc toolchain instead of compiling from source #165

[Copilot]

Pull request overview

Adds a read-only GetRequestStatus gateway RPC for looking up the reconciled customer-facing status of a submitted request by sqid.

Changes:

• Adds proto API definitions and regenerated Go/YARPC/gRPC bindings.
• Introduces GetRequestStatusController with validation, request-log reconciliation, metrics, and tests.
• Wires the new controller into the example gateway server.

Reviewed changes

Copilot reviewed 5 out of 8 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
gateway/proto/gateway.proto	Defines request/response/error messages and the new RPC.
gateway/protopb/gateway.pb.go	Regenerated protobuf types.
gateway/protopb/gateway_grpc.pb.go	Regenerated gRPC client/server bindings.
gateway/protopb/gateway.pb.yarpc.go	Regenerated YARPC bindings.
gateway/controller/get_request_status.go	Adds controller logic for status lookup.
gateway/controller/get_request_status_test.go	Adds happy-path and error-path tests.
gateway/controller/BUILD.bazel	Adds new source, test, and dependencies.
example/server/gateway/main.go	Registers and wires the new controller.

Files not reviewed (3)

• gateway/protopb/gateway.pb.go: Language not supported
• gateway/protopb/gateway.pb.yarpc.go: Language not supported
• gateway/protopb/gateway_grpc.pb.go: Language not supported

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[Copilot]

Pull request overview

Copilot reviewed 5 out of 8 changed files in this pull request and generated no new comments.

Files not reviewed (3)

• gateway/protopb/gateway.pb.go: Language not supported
• gateway/protopb/gateway.pb.yarpc.go: Language not supported
• gateway/protopb/gateway_grpc.pb.go: Language not supported