client.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.
 *
 */

console.log("We're logging in the console.");

const {HelloRequest, RepeatHelloRequest,
       HelloReply} = require('./helloworld_pb.js');
const {GreeterClient} = require('./helloworld_grpc_web_pb.js');

var client = new GreeterClient('http://127.0.0.1:5000', null, null);

// simple unary call
var request = new HelloRequest();
request.setName('A very big world');

client.sayHello(request, {}, (err, response) => {
  if (err) {
    console.log(`Unexpected error for sayHello: code = ${err.code}` +
                `, message = "${err.message}"`);
  } else {
    console.log(response.getMessage());
  }
});


// server streaming call
/*
var streamRequest = new RepeatHelloRequest();
streamRequest.setName('World');
streamRequest.setCount(5);

var stream = client.sayRepeatHello(streamRequest, {});
stream.on('data', (response) => {
  console.log(response.getMessage());
});
stream.on('error', (err) => {
  console.log(`Unexpected stream error: code = ${err.code}` +
              `, message = "${err.message}"`);
});
*/