GRPC - cannot simulate gRPC error status, false positive mock response

[szokebarnabas]

Describe the bug Hi, apologies in advance if the answer to my question is trivial but I don't have any experience with gRpc and protobufs.

What I would like to achieve is:

• Simulate an error status (e.g return standard gRPC error codes: https://grpc.github.io/grpc/core/md_doc_statuscodes.html): It's not documented in camouflage and I did not manage to create an error stub using this spec: https://cloud.google.com/apis/design/errors
• Simulate a successful response - it's working but I cannot define request patterns in the stubs

To Reproduce Steps to reproduce the behavior:

1. Mock File Content

   https://github.com/stargate/stargate/tree/master/grpc-proto/proto

2. File structure:

mocks:

./mocks/stargate/Stargate/ExecuteBatch.mock

protos:

./protos/query.proto
./protos/stargate.proto

3. Docker-compose:

   
   version: "3.9"
   networks:
   camouflage:
   driver: bridge

volumes: prometheus_data: {} grafana_data: {} camouflage_data: {}

services: camouflage_ui: image: shubhendumadhukar/camouflage-filemanager:latest container_name: camouflage_ui_2 volumes:

• camouflage_data:/opt/virtual_services environment: FS_ROOT: /opt/virtual_services WRITE_PROTECTED: "false" PORT: 3001 ports:

• "3001:3001" labels: org.label-schema.group: "camouflage"

  camouflage: image: shubhendumadhukar/camouflage:latest container_name: camouflage_2 volumes:

  • ./protos:/app/grpc/protos
  • ./mocks:/app/grpc/mocks
  • ./config/config.yml:/app/config.yml
  • ./config/.protoignore:/app/.protoignore restart: unless-stopped ports:
• "8080:8080"
• "8443:8443"
• "8081:8081"
• "4312:4312"
• "8082:8082"
• "5555:5555" networks:
• camouflage labels: org.label-schema.group: "camouflage"

4. ExecuteBatch.mock:

{ "warnings": [ "hello" ], "schema_change": { "change_type": "CREATED" }, "result_set": { "columns": [ { "name": "my column", "type": { "basic": "ASCII" } } ], "rows": [ { "values": [ { "string": "hello world" } ] } ] } }

6. Execute the following gRpc request:

grpcurl -v -d '{"queries":[{"cql":"UPDATE bookmarking.bookmarks USING TTL :ttl AND TIMESTAMP :timestamp SET streamPosition = :streamposition, created = :created WHERE pvid = :pvid AND providerterritory = :providerterritory AND provider = :provider AND householdId = :householdid AND timeBucket = :timebucket and personaId = :personaid;"}]}' -proto query.proto -proto stargate.proto -plaintext localhost:4312 stargate.Stargate/ExecuteBatch

Response:

Resolved method descriptor: // Executes a batch of CQL queries. rpc ExecuteBatch ( .stargate.Batch ) returns ( .stargate.Response );

Request metadata to send: (empty)

Response headers received: content-type: application/grpc+proto date: Fri, 02 Sep 2022 07:38:52 GMT grpc-accept-encoding: identity,deflate,gzip

Response contents: { "warnings": [ "hello" ], "schemaChange": { "changeType": "DROPPED" } }

Response trailers received: (empty) Sent 1 request and received 1 response

**Expected behavior**
It's should be possible to define request matchers and return responses accordingly.

Thanks,
Barnabas

[shubhendumadhukar]

Hi @szokebarnabas,

It's should be possible to define request matchers and return responses accordingly.

Could you please elaborate with an example, what kind of request matchers are you referring to?

[scvnc]

I'm unsure if this is a bug or if this isn't documented or supported.

Take HTTP: Camouflage mocks HTTP by having you provide the entire HTTP response in your *.mock file, including status code headers, etc. This would allow me to test scenarios like when the server responds with a HTTP 400, then I can verify my app behaves accordingly.

Similarly in gRPC we have status codes and I may want to do the same thing where I configure camouflage to return GRPC 16 "Unauthorized" so that I can verify my app behaves accordingly when such a thing happens. I don't see it documented.

Since I'm proxying with envoy to camouflage, I also would like to set headers but I know I may be asking for too much there.