protoc-gen-grpc-gateway fails silently after release 1.10

[rmilejcz]

Bug reports:

protoc-gen-grpc-gateway doesn't build stubs after updating to release 1.10

Steps you follow to reproduce the error:

1. Install plugins:

go get -u github.com/grpc-ecosystem/grpc-gateway/protoc-gen-grpc-gateway
go get -u github.com/golang/protobuf/protoc-gen-go

2. Make a suitable service file (copy paste this into terminal):

touch service.proto
cat <<EOF >>service.proto
syntax = "proto3";
package example;

import "google/api/annotations.proto";

message StringMessage {
  string value = 1;
}

service YourService {
  rpc Echo(StringMessage) returns (StringMessage) {
    option (google.api.http) = {
      post: "/v1/example/echo",
      body: "*"
    };
  }
}
EOF

3. In the same folder, try generating GW stubs by running:

protoc -I/usr/local/include -I. \
  -I$GOPATH/src \
  -I$GOPATH/src/github.com/grpc-ecosystem/grpc-gateway/third_party/googleapis \
  --grpc-gateway_out=logtostderr=true:. \
  service.proto

4. Observe that service.pb.gw.go does not exist as expected.

What did you expect to happen instead:

service.pb.gw.go should be output in the same folder as service.proto

What's your theory on why it isn't working:

Hard to say since there is no output and I'm unfamiliar with how these tools work under the hood

[johanbrandhorst]

Let me investigate this...

[johanbrandhorst]

Can't reproduce in my repo johanbrandhorst/grpc-gateway-boilerplate@7ea73ef. What version were you updating from?

[rmilejcz]

I believe it was 1.9.4. I went ahead and did a clean build in a docker environment and this bug did not occur so it must be some issue in my local environment. Unfortunately we aren't using go modules so I can't say whether or not downgrading would fix the issue. Thanks as usual for the prompt and helpful response, sorry for the (apparent) false alarm.

EDIT:

In case anyone else encounters this, I was able to resolve it by building protoc-gen-grpc-gateway from source instead of go getting it. If you already have it installed simply:

cd $GOPATH/src/github.com/grpc-ecosystem/grpc-gateway
go build -o $GOBIN/protoc-gen-grpc-gateway

[johanbrandhorst]

We also have pre-built binaries for most platforms for every release.