app.js
/*
* Copyright 2016 e-UCM (http://www.e-ucm.es/)
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* This project has received funding from the European Union’s Horizon
* 2020 research and innovation programme under grant agreement No 644187.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0 (link is external)
*
* 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.
*/
'use strict';
var path = require('path'),
logger = require('morgan'),
express = require('express'),
bodyParser = require('body-parser'),
elasticsearch = require('elasticsearch');
var app = express();
var isTest = (process.env.NODE_ENV === 'test');
app.config = require(isTest ? './config-test' : './config');
// Set database
var dbProvider = {
db: function () {
return this.database;
}
};
var kafkaService = require('./lib/services/kafka')(app.config.kafka.uri);
var stormService = require('./lib/services/storm')(app.config.storm, app.config.kafka.uri, app.config.kafka.uri);
var connectToDB = function () {
var MongoClient = require('mongodb').MongoClient;
var connectionString = app.config.mongodb.uri;
MongoClient.connect(connectionString, function (err, db) {
if (err) {
console.log(err);
console.log('Impossible to connect to MongoDB. Retrying in 5s');
setTimeout(connectToDB, 5000);
} else {
console.log('Successfully connected to ' + connectionString);
dbProvider.database = db;
if (!isTest) {
kafkaService.createTopic(app.config.kafka.topicName);
stormService.startTopology(app.config.storm.defaultAnalysisName,
app.config.storm.realtimeJar,
app.config.kafka.topicName)
.then(function() {
console.log('Topology Started: ' + app.config.storm.defaultAnalysisName);
})
.fail(function(error) {
console.log(error);
});
}
}
});
};
app.esClient = new elasticsearch.Client({
host: app.config.elasticsearch.uri,
api: '5.6'
});
app.esClient.ping({
// Ping usually has a 3000ms timeout
requestTimeout: 3000
}, function (error) {
if (error) {
console.trace('elasticsearch cluster is down!');
} else {
console.log('Successfully connected to elasticsearch: ' + app.config.elasticsearch.uri);
}
});
connectToDB();
require('./lib/db').setDBProvider(dbProvider);
// View engine setup
app.set('views', path.join(__dirname, 'views'));
app.set('view engine', 'jade');
// Middleware
if (app.get('env') === 'development') {
app.use(logger('dev'));
}
app.use(bodyParser.json({limit: app.config.maxSizeRequest}));
app.use(bodyParser.urlencoded({extended: false, limit: app.config.maxSizeRequest}));
app.use(express.static(path.join(__dirname, 'public')));
app.use(function (req, res, next) {
res.sendDefaultSuccessMessage = function () {
res.json({
message: 'Success.'
});
};
next();
});
app.get('/', function (req, res) {
res.render('apidoc');
});
app.use(app.config.apiPath + '/games', require('./routes/games'));
app.use(app.config.apiPath + '/courses', require('./routes/courses'));
app.use(app.config.apiPath + '/classes', require('./routes/classes'));
app.use(app.config.apiPath + '/classes', require('./routes/groups'));
app.use(app.config.apiPath + '/classes', require('./routes/groupings'));
app.use(app.config.apiPath + '/activities', require('./routes/activities')(kafkaService, stormService));
app.use(app.config.apiPath + '/analysis', require('./routes/analysis'));
app.use(app.config.apiPath + '/offlinetraces', require('./routes/offlinetraces')(app.config.kafka));
app.use(app.config.apiPath + '/collector', require('./routes/collector'));
app.use(app.config.apiPath + '/health', require('./routes/health'));
app.use(app.config.apiPath + '/kibana', require('./routes/kibana'));
app.use(app.config.apiPath + '/lti', require('./routes/lti'));
app.use(app.config.apiPath + '/env', require('./routes/env'));
var activities = require('./lib/activities');
activities.preRemove(function (_id, next) {
activities.deleteAnalysisData(app.config, _id, app.esClient);
next();
});
var dataSource = require('./lib/traces');
dataSource.addConsumer(require('./lib/consumers/fsraw')(app.config.rawTracesFolder));
dataSource.addConsumer(require('./lib/consumers/elasticsearch')(app.esClient));
dataSource.addConsumer(require('./lib/consumers/kafka')(app.config.kafka));
if (app.config.lrs.useLrs === true) {
dataSource.addConsumer(require('./lib/consumers/openlrs')(app.config.lrs));
}
// Catch 404 and forward to error handler
app.use(function (req, res, next) {
var err = new Error('Not Found');
err.status = 404;
next(err);
});
// Production error handler
// no stacktraces leaked to user
app.use(function (err, req, res, next) {
var info = {
message: err.message
};
info.stack = err.stack;
res.status(err.status || 500).send(info);
});
module.exports = app;