server.js

/**
 *
 * Copyright 2018 Google LLC
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     https://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *
 */

var PROTO_PATH = __dirname + '/helloworld.proto';

var assert = require('assert');
var grpc = require('@grpc/grpc-js');
var protoLoader = require('@grpc/proto-loader');
var packageDefinition = protoLoader.loadSync(
    PROTO_PATH,
    {keepCase: true,
     longs: String,
     enums: String,
     defaults: true,
     oneofs: true
    });
var protoDescriptor = grpc.loadPackageDefinition(packageDefinition);
var helloworld = protoDescriptor.helloworld;

/**
 * @param {!Object} call
 * @param {function():?} callback
 */
function doSayHello(call, callback) {
  callback({
    code: 200,
    message: "invalid input",
    status: grpc.status.INTERNAL
  });
}

/**
 * @return {!Object} gRPC server
 */
function getServer() {
  var server = new grpc.Server();
  server.addService(helloworld.Greeter.service, {
    sayHello: doSayHello,
  });
  return server;
}

if (require.main === module) {
  var server = getServer();
  server.bindAsync(
    '0.0.0.0:8080', grpc.ServerCredentials.createInsecure(), (err, port) => {
      assert.ifError(err);
      server.start();
  });
}

exports.getServer = getServer;