go type_error ai_generated true

rpc error: code = Unimplemented desc = method /helloworld.Greeter/SayHello not implemented

ID: go/grpc-unimplemented-method-not-found

Also available as: JSON · Markdown · 中文
80%Fix Rate
88%Confidence
0Evidence
2024-02-20First Seen

Version Compatibility

VersionStatusIntroducedDeprecatedNotes
1.0 active — — —
1.1 active — — —

Root Cause

The server does not have a handler registered for the requested RPC method, often due to a mismatch between protobuf definitions and server implementation.

generic

中文

服务器没有为请求的RPC方法注册处理程序，通常是由于protobuf定义与服务器实现不匹配。

Workarounds

  1. 95% success Ensure the server registers the exact method from the protobuf service definition. 
    type server struct {
    pb.UnimplementedGreeterServer
}
func (s *server) SayHello(ctx context.Context, req *pb.HelloRequest) (*pb.HelloReply, error) {
    return &pb.HelloReply{Message: "Hello " + req.Name}, nil
}
// Then register: pb.RegisterGreeterServer(grpcServer, &server{})
  2. 90% success Regenerate protobuf code and rebuild both client and server. 
    protoc --go_out=. --go-grpc_out=. helloworld.proto
go build ./...

Dead Ends

Common approaches that don't work:

  1. Restart the server without updating the protobuf definition. 100% fail

    The server code is missing the method implementation; restarting does not add it.

  2. Call a different method with similar name hoping it works. 95% fail

    The client is designed to call a specific method; using another may cause data inconsistency.