springer-uptime/app/api/app.js

Remote monitoring for HTTP applications

/**
 * Module dependencies.
 */
var express    = require('express');
var Check      = require('../../models/check');
var CheckEvent = require('../../models/checkEvent');
var raven      = require('raven');
var config     = require('config')

var sentry = new raven.Client(config.sentry_dsn);
sentry.patchGlobal(function() {
  console.log('Sent error to Sentry. Terminating process.');
  process.exit(1);
});

var app = module.exports = express();

var debugErrorHandler = function() {
  app.use(express.errorHandler({ dumpExceptions: true, showStack: true }));
}

// middleware
app.configure(function(){
  app.use(app.router);
});

app.configure('development', debugErrorHandler);

app.configure('test', debugErrorHandler);

app.configure('production', function(){
  // The request handler be the first item
  app.use(raven.middleware.express.requestHandler(config.sentry_dsn));
  // The error handler must be before any other error middleware
  app.use(raven.middleware.express.errorHandler(config.sentry_dsn));
  app.use(express.errorHandler());
});


// up count
var upCount;
var refreshUpCount = function(callback) {
  var count = { up: 0, down: 0, paused: 0, total: 0 };
  Check
  .find()
  .select({ isUp: 1, isPaused: 1 })
  .exec(function(err, checks) {
    if (err) return callback(err);
    checks.forEach(function(check) {
      count.total++;
      if (check.isPaused) {
        count.paused++;
      } else if (check.isUp) {
        count.up++;
      } else {
        count.down++;
      }
    });
    upCount = count;
    callback();
  });
};

Check.on('afterInsert', function() { upCount = undefined; });
Check.on('afterRemove', function() { upCount = undefined; });
CheckEvent.on('afterInsert', function() { upCount = undefined; });

app.get('/checks/count', function(req, res, next) {
  if (upCount) {
    res.json(upCount);
  } else {
    refreshUpCount(function(err) {
      if (err) return next(err);
      res.json(upCount);
    });
  }
});

// Routes

require('./routes/check')(app);
require('./routes/tag')(app);
require('./routes/ping')(app);

// route list
app.get('/', function(req, res) {
  var routes = [];
  for (var verb in app.routes) {
    app.routes[verb].forEach(function(route) {
      routes.push({method: verb.toUpperCase() , path: app.route + route.path});
    });
  }
  res.json(routes);
});

if (!module.parent) {
  app.listen(3000);
  console.log('Express started on port 3000');
}