metadata.NewOutgoingContext is undefined

[aaronjwood]

This breaks programs that link against grpc-gateway directly or indirectly (such as etcd-io/etcd#7763)

[tamalsaha]

@aaronjwood , may be use 1.2.0 of grpc-gateway? The real fix is, you need the next release of grpc go. grpc/grpc-go#1187 :)

[aaronjwood]

Thanks, we're working on a vendoring strategy so we'll be sure to catch this. Glad to hear it's fixed in the next release.

[tmc]

@aaronjwood for clarity, grpc-go introduced an api deprecation and we adopted this in 1.2.2 -- use 1.2.0 if you need to use an older version of grpc-go. The answer is likely update your version of grpc-go.

[tmc]

For posterity's sake (and googlebot), this sort of issue would likely render as:

# github.com/your/sweet/project/vendor/github.com/grpc-ecosystem/grpc-gateway/runtime
vendor/github.com/grpc-ecosystem/grpc-gateway/runtime/context.go:97: undefined: metadata.NewOutgoingContext

Somewhat relatedly, these sorts of errors likely mean you need to re-generate your .pb.gw.go files with a newer grpc-gateway:

protos/servicea/rpc.pb.gw.go:614: not enough arguments in call to runtime.AnnotateContext
	have ("golang.org/x/net/context".Context, *http.Request)
	want ("golang.org/x/net/context".Context, *runtime.ServeMux, *http.Request)
protos/servicea/rpc.pb.gw.go:616: not enough arguments in call to runtime.HTTPError
	have ("golang.org/x/net/context".Context, runtime.Marshaler, http.ResponseWriter, *http.Request, error)
	want ("golang.org/x/net/context".Context, *runtime.ServeMux, runtime.Marshaler, http.ResponseWriter, *http.Request, error)

[tmc]

@aaronjwood perhaps a valuable documentation addition would be a small vendoring guide. Would love to see some shared tips!

[aaronjwood]

Thanks for the info @tmc! Let me sort out our internal issues at work from this and then I can come back to some sort of vendoring doc :)

[tmc]

@aaronjwood that'd be awesome!

[tmc]

I opened #365 to track.