How to Use Unary RPC in Go

Unary RPC in Go is a standard gRPC pattern where a client sends a single request and receives a single response, implemented by defining a service in a .proto file and using the go generate tool to create the server and client code. Define your service and method in a Protocol Buffers file, then generate the Go code to handle the request-response cycle.

syntax = "proto3";

package example;

service UnaryService {
  rpc SayHello (HelloRequest) returns (HelloResponse);
}

message HelloRequest {
  string name = 1;
}

message HelloResponse {
  string message = 1;
}

Unary RPC is the simplest way for two programs to talk: one sends a message, and the other sends back exactly one reply. It works like sending a letter and waiting for a single answer before doing anything else. You use this pattern for standard API calls where you need an immediate result.