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collector.js
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collector.js
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var fs = require('fs'),
cron = require('cron'),
events = require('events'),
util = require('util'),
path = require('path'),
SampleDB = require('./sampledb').SampleDB,
agents = [];
function loadAgents(collector, agentPaths, callback) {
agentPaths.forEach(function(agentPath) {
// iterate through the agents in the
fs.readdir(agentPath, function(err, files) {
if (! err) {
files.forEach(function(filename) {
var agentId = path.basename(filename, '.js');
console.log('Attempting to load agent: ' + agentId);
try {
var Agent = require('./agents/' + agentId).Agent;
// if the Agent class has been defined, then create an instance
if (Agent) {
// create the agent
var agent = new Agent();
// initialise
agent.id = agentId;
agent.opts = collector.opts[agentId] || {};
// initialise the frequency
// priority = options first, default frequency (if set) 2nd, cron pattern for every second last
agent.frequency = agent.opts.frequency || agent.frequency || '* * * * * *';
// add the list of active agents
collector.agents.push(agent);
} // if
else {
console.log('Agent= no run handler for agent "' + agentId + '", not registering');
} // if..else
}
catch (e) {
console.log('agent "' + filename + '" is invalid: ' + e.message);
} // try..catch
});
if (callback) {
callback();
} // if
} // if
});
});
} // loadAgents
var Collector = exports.Collector = function(opts) {
// initialise options
opts = opts || {};
opts.agents = opts.agents || [];
// add the core agents to the begin of the requested agents
opts.agents.unshift(path.join(__dirname, 'agents'));
// save the options to the collector
this.opts = opts;
// initialise members
this.agents = [];
}; // Collector
util.inherits(Collector, events.EventEmitter);
Collector.prototype.loadAgents = function(callback) {
// load the agents
loadAgents(this, this.opts.agents, callback);
};
Collector.prototype.scheduleAgents = function() {
var collector = this;
this.agents.forEach(function(agent) {
if (typeof agent.frequency == 'string') {
// check the pattern is a valid cron pattern, and then register the job
new cron.CronTime(agent.frequency);
agent.cron = new cron.CronJob(agent.frequency, function() {
collector.runAgent(agent);
});
}
else {
setInterval(function() {
collector.runAgent(agent);
}, agent.frequency);
} // if..else
});
}; // schedule
Collector.prototype.runAgent = function(agent) {
var collector = this;
agent.run(function(data, details) {
collector.emit('data', agent.id, data, details);
});
}; // runAgent
exports.collectToDB = function(path, opts) {
var db, collector;
// create the sample db
db = new SampleDB(path);
// create the collector and save samples to the db
collector = new Collector(opts).on('data', function(agentId, data, details) {
db.save(agentId, data, details);
});
collector.loadAgents(function() {
collector.scheduleAgents();
});
return {
collector: collector,
db: db,
stop: function() {
db.close();
process.exit();
}
};
};