go 的 protoc 插件调用逻辑

要让protoc使用插件，需要做下面事情：

PlacethepluginbinarysomewhereinthePATHandgiveitthename"protoc-gen-NAME"(replacing"NAME"withthenameofyourplugin).

Ifyoutheninvokeprotocwiththeparameter–NAME_out=OUT_DIR(again,replace"NAME"withyourplugin'sname),protocwillinvokeyourplugintogeneratetheoutput,whichwillbeplacedinOUT_DIR.

Placethepluginbinaryanywhere,withanyname,andpassthe–pluginparametertoprotoctodirectittoyourpluginlikeso:

protoc--plugin=protoc-gen-NAME=path/to/mybinary--NAME_out=OUT_DIR

OnWindows,makesuretoincludethe.exesuffix:

protoc--plugin=protoc-gen-NAME=path/to/mybinary.exe--NAME_out=OUT_DIR

参考：https://developers.google.com/protocol-buffers/docs/reference/cpp/google.protobuf.compiler.plugin

产生go的grpc代码的插件命令为：

protoc--go_out=plugins=grpc,import_path=mypackage:.*.proto

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这里通过--NAME_out，就能知道是需要找protoc-gen-NAME插件，即protoc-gen-go插件。[/code]

而--go_out=plugins=grpc则会在https://github.com/golang/protobuf这里找到

https://github.com/golang/protobuf/blob/master/protoc-gen-go/grpc/grpc.go做为插件。