grpc-proxy Fields marked as `repeated` are truncated

Fields marked as `repeated` are truncated

Open adamthesax opened this issue 3 years ago • 3 comments

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While proxying messages that contain repeated fields, the values are truncated to only their last value. This happens both on incoming messages and the outgoing response. I created a simple test service that exhibits this behavior. Given a proto looks like:

service Greeter {
  rpc SayHelloAgain (HelloRequest) returns (RepeatedHelloReply) {}
}

// The request message containing the user's name.
message HelloRequest {
  string name = 1;
}

message RepeatedHelloReply {
  repeated string message = 1;
}

When I hit the gRPC service directly, I get an array of strings back:

$ grpcurl -plaintext -d '{"name": "Joe"}' localhost:50051 Greeter/SayHelloAgain
{
  "message": [
    "1: Hello Joe",
    "2: Hello Joe",
    "3: Hello Joe",
    "4: Hello Joe",
    "5: Hello Joe"
  ]
}

However making that same call via the proxy I get a truncated response:

grpcurl -plaintext -d '{"name": "Joe"}' localhost:50052 Greeter/SayHelloAgain
{
  "message": [
    "5: Hello Joe"
  ]
}

I've attached my example service that exhibits the behavior. The basic gRPC server runs on :50051 while the proxy runs on 50052. Use make run to start the service, and make test to hit the service to reproduce the issue. grpc-proxy-test.zip

Thanks in advanced for your assistance!