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.