examples/javascript/messenger/client.js

#!/usr/bin/env node
/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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
 *
 *   http://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.
 *
 */

// Simple client for use with server.js illustrating request/response

// Check if the environment is Node.js and if not log an error and exit.
if (typeof process === 'object' && typeof require === 'function') {
    var proton = require("qpid-proton-messenger");

    var address = "amqp://0.0.0.0";
    var subject = "UK.WEATHER";
    var replyTo = "~/replies";
    var msgtext = "Hello World!";
    var tracker = null;

    var message = new proton.Message();
    var messenger = new proton.Messenger();

    var pumpData = function() {
        while (messenger.incoming()) {
            var t = messenger.get(message);

            console.log("Reply:");
            console.log("Address: " + message.getAddress());
            console.log("Subject: " + message.getSubject());

            // body is the body as a native JavaScript Object, useful for most real cases.
            //console.log("Content: " + message.body);

            // data is the body as a proton.Data Object, used in this case because
            // format() returns exactly the same representation as recv.c
            console.log("Content: " + message.data.format());

            messenger.accept(t);
            messenger.stop();
        }

        if (messenger.isStopped()) {
            message.free();
            messenger.free();
        }
    };

    var args = process.argv.slice(2);
    if (args.length > 0) {
        if (args[0] === '-h' || args[0] === '--help') {
            console.log("Usage: node client.js [-r replyTo] [-s subject] <addr> (default " + address + ")");
            console.log("Options:");
            console.log("  -r <reply to> The message replyTo (default " + replyTo + ")");
            console.log("  -s <subject> The message subject (default " + subject + ")");
            process.exit(0);
        }

        for (var i = 0; i < args.length; i++) {
            var arg = args[i];
            if (arg.charAt(0) === '-') {
                i++;
                var val = args[i];
                if (arg === '-r') {
                    replyTo = val;
                } else if (arg === '-s') {
                    subject = val;
                }
            } else {
                address = arg;
            }
        }
    }

    messenger.on('error', function(error) {console.log(error);});
    messenger.on('work', pumpData);
    messenger.setOutgoingWindow(1024);
    messenger.recv(); // Receive as many messages as messenger can buffer.
    messenger.start();

    message.setAddress(address);
    message.setSubject(subject);
    message.setReplyTo(replyTo);
    message.body = msgtext;

    tracker = messenger.put(message);
} else {
    console.error("client.js should be run in Node.js");
}