转自： http://russmatney.com/techsposure/update-protobuf-golang-grpc/
TL;DR: When protobuf updates, all the .protos and deps need to update.
This post is a quick-lookup for how to do that so I’m not googling it every time.
Go Dependencies
Update your relevant go dependencies:
sh go get -u github.com/golang/protobuf/{proto,protoc-gen-go} && go get -u google.golang.org/grpc
Update Protoc
Then (or before) download and install the latest protoc binary: github.com/google/protobuf/releases.
Download the zip, open it, and move the protoc executable file into somewhere on your path.
sh mv ~/Downloads/protoc-3.0.0-beta-3.1-osx-x86_64/protoc /usr/local
Rebuild where necessary
Rebuild your .protoc files, likely per project.
For me, this means running go generate ./... in each go project’s root directory.