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protoc-gen-go-grpc

This tool generates Go language bindings of services in protobuf definition files for gRPC. For usage information, please see our quick start guide.

Future-proofing services

By default, to register services using the methods generated by this tool, the service implementations must embed the corresponding Unimplemented<ServiceName>Server for future compatibility. This is a behavior change from the grpc code generator previously included with protoc-gen-go. To restore this behavior, set the option require_unimplemented_servers=false. E.g.:

  protoc --go-grpc_out=. --go-grpc_opt=require_unimplemented_servers=false[,other options...] \

Note that this is not recommended, and the option is only provided to restore backward compatibility with previously-generated code.

When embedding the Unimplemented<ServiceName>Server in a struct that implements the service, it should be embedded by value instead of as a pointer. If it is embedded as a pointer, it must be assigned to a valid, non-nil pointer or else unimplemented methods would panic when called. This is tested at service registration time, and will lead to a panic in Register<ServiceName>Server if it is not embedded properly.