proxy_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
//
//      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.

var Proxy = require('./proxy');
var RouterClient = require('./router_client');
var ServiceRegistryClient = require('./service_registry_client');
var VersionClient = require('./version_client');
var StatsClient = require('stats-client');
var MonitorService = require('./monitor/service');

var port = process.env.PORT || 4001;

var opts = {
  host: process.env.COREOS_PRIVATE_IPV4
};

// allow a list of peers to be passed, overides COREOS_PRIVATE_IPV4
if (process.env.ETCD_PEER_HOSTS) {
  opts.host = process.env.ETCD_PEER_HOSTS.split(',');
}

var usingTelegrafFormat = !!(process.env.INFLUXDB_HOST);
if (usingTelegrafFormat) {
  console.log('Using telgraf format.');
}

var serviceRegistryClient = new ServiceRegistryClient(opts);
var routerClient = new RouterClient(opts);
var versionClient = new VersionClient(opts);
var statsdHost = process.env.COREOS_PRIVATE_IPV4 || 'localhost';
var statsClient = new StatsClient(statsdHost + ':8125', { }, { telegraf: usingTelegrafFormat });
var targetMonitor = new MonitorService(serviceRegistryClient, { 
  disabled: (process.env.DISABLE_TARGET_MONITOR) ? true : false
});

var proxy = new Proxy(serviceRegistryClient, routerClient, versionClient, statsClient, targetMonitor);
proxy.listen(port, function() {
  console.log('proxy listening on http://localhost:' + port);
});

['SIGINT', 'SIGTERM'].forEach(function(signal) {
  process.on(signal, function() {
    
    var count = proxy._peerSockets.length;
    proxy._peerSockets.forEach(function(peer) {
      routerClient.remove(peer.tenantId, peer.targetName, function() {
        count--;
        if (count === 0) {
          process.exit();
        }
      })
    });
    
    if (count === 0) {
      process.exit();
    }

  });
});