The simplest chat service I could make using gRPC. There's an RPC to send messages, and one to receive messages using a stream. All clients who are using the "Receive" RPC will receive the messages from a "Send" RPC from other clients.
message Message {
string username = 1;
string message = 2;
}
message Join {
string username = 1;
}
service ChatService {
rpc Send(Message) returns (google.protobuf.Empty) {}
rpc Receive(Join) returns (stream Message) {}
}
Client output when receiving messages
Server output
