server.ts

import { loadSync } from "@grpc/proto-loader";
import {
  loadPackageDefinition,
  Server,
  ServerCredentials,
} from "@grpc/grpc-js";
import { ProtoGrpcType } from "./proto/hello_world";
import { GreeterServiceHandlers } from "./proto/GreeterService";

const PROTO_PATH = "./hello_world.proto";
const packageDefinition = loadSync(PROTO_PATH, {
  keepCase: true,
  longs: String,
  enums: String,
  defaults: true,
  oneofs: true,
});
const hello_proto = loadPackageDefinition(
  packageDefinition
) as unknown as ProtoGrpcType;

const sayHello: GreeterServiceHandlers["SayHello"] = (call, callback) => {
  const { name } = call.request;
  callback(null, { message: `Bonjour ${name}` });
};

function startServer() {
  const server = new Server();
  server.addService(hello_proto.GreeterService.service, { sayHello });
  const PORT = 3000;
  const host = `localhost:${PORT}`;
  server.bindAsync(host, ServerCredentials.createInsecure(), (error) => {
    if (error) {
      console.log("An error has occurred in bindAsync", error);
      return;
    }
    server.start();
    console.log(`Server listening on: ${host}`);
  });
}

startServer();