No pattern specified in google.api.HttpRule about grpc-gateway

[mtsgrd]

+1

I am facing a similar issue. I also noticed that the problem did not occur on a different computer with "same" setup steps. Here is a contrived example that shows how to reproduce this issue:

First I modified the Makefile to avoid the google/http issue (#67):

$ cd $GOPATH/src/github.com/gengo/grpc-gateway

$ nano Makefile
examples: $(EXAMPLE_SVCSRCS) $(EXAMPLE_GWSRCS) $(EXAMPLE_DEPSRCS)
    sed -i "s/import _ \"google\/api\"//" ./examples/**/*.pb.go

$ make test

Test run successfully. Now I undo all the changes made by make test. This reverts the generated files back to their original version.

$ git reset HEAD --hard

Now, if I run make test, I get the following error:

$ make test
go build -o bin/protoc-gen-grpc-gateway github.com/gengo/grpc-gateway/protoc-gen-grpc-gateway
protoc -I /usr/local/bin//../include -I. -Ithird_party/googleapis --plugin=bin/protoc-gen-grpc-gateway --grpc-gateway_out=logtostderr=true,Mgoogle/protobuf/descriptor.proto=github.com/golang/protobuf/protoc-gen-go/descriptor,Mexamples/sub/message.proto=github.com/gengo/grpc-gateway/examples/sub:. examples/examplepb/echo_service.proto examples/examplepb/a_bit_of_everything.proto examples/examplepb/flow_combination.proto
E1210 06:26:49.972372    7693 services.go:107] No pattern specified in google.api.HttpRule: Echo
--grpc-gateway_out: none of pattern specified
make: *** [examples/examplepb/echo_service.pb.gw.go] Error 1

If I run make realclean (and add the google/http sed rule) and then run make test, everything works again. @yugui, can you please help us fix this issue?

[yugui]

I'm trying to investigate the issue.

There are some quick updates:

• I am not sure why make test works fine. But protoc-gen-grpc-gateway fails to load message descriptor correctly. When it loads your message descriptor, the descriptor actually lacks http path mapping even though you specified it in .proto file.
• Another possibly related thing is that proto.MarshalText and proto.UnmarshalText don't roundtrip for oneof fields.
• protoc warns [libprotobuf WARNING google/protobuf/compiler/parser.cc:492] No syntax specified for the proto file. Please use 'syntax = "proto2";' or 'syntax = "proto3";' to specify a syntax version. (Defaulted to proto2 syntax.) when I see this issue.

[yugui]

The root cause was that generated third_party/googleapis/google/api/*.pb.go were incompatible to recent github.com/golang/protobuf.
#71 will fix this issue.

Thank you @yugui for looking into this quickly. Please merge #71 into master.

[yugui]

merged.

Thanks @yugui . Everything is working here. For someone checking this issue, the fix was:

• Update grpc-gateway (go get -u ...)
• Update protoc build command to include the correct path for google/api

--go_out=Mgoogle/api/annotations.proto=github.com/gengo/grpc-gateway/third_party/googleapis/google/api,plugins=grpc:.

[mtsgrd]

Thanks @yugui, you're a star!

[pgracio]

Thanks @yugui this works like a charm!