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<a href="../index.html">all files</a> / <a href="index.html">lib/</a> sentinel.js
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<div class='fl pad1y space-right2'>
<span class="strong">67.65% </span>
<span class="quiet">Statements</span>
<span class='fraction'>46/68</span>
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<div class='fl pad1y space-right2'>
<span class="strong">55% </span>
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<span class='fraction'>11/20</span>
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<div class='fl pad1y space-right2'>
<span class="strong">61.11% </span>
<span class="quiet">Functions</span>
<span class='fraction'>11/18</span>
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<div class='fl pad1y space-right2'>
<span class="strong">67.65% </span>
<span class="quiet">Lines</span>
<span class='fraction'>46/68</span>
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<span class="cline-any cline-neutral"> </span></td><td class="text"><pre class="prettyprint lang-js">var _ = require('lodash');
var debug = require('debug')('sentinel');
/**
* Watches for changes in services to restart them when they change.
*/
function Sentinel(storage, watchmen, options) {
this.options = options || {};
this.storage = storage;
this.watchmen = watchmen;
}
exports = module.exports = Sentinel;
var DEFAULT_INTERVAL = 5000;
var FIELDS_WHICH_MODIFICATION_TRIGGER_SERVICE_RESTART = [
'name',
'interval',
'failureInterval',
'failuresToBeOutage',
'port',
'url',
'timeout',
'alertTo',
'pingServiceName',
'pingServiceOptions',
'warningThreshold'
];
var timeoutId = null;
Sentinel.prototype._findAdded = function (databaseServices, runningServices) {
var added = [];
databaseServices.forEach(function (s) {
if (!_.find(runningServices, function (rs) {
return rs.id == s.id;
})) {
added.push(s);
}
});
return added;
};
Sentinel.prototype._findRemoved = function (databaseServices, runningServices) {
var removed = [];
runningServices.forEach(function (runningService) {
if (!_.find(databaseServices, function (s) {
return s.id == runningService.id;
})) {
removed.push(runningService);
}
});
return removed;
};
function propertyModified(propDb, propService) {
return JSON.stringify(propDb) !== JSON.stringify(propService);
}
Sentinel.prototype._findModified = function (databaseServices, runningServices) {
var modified = [];
runningServices.forEach(function (runningService) {
var dbService = _.find(databaseServices, function (rs) {
return rs.id == runningService.id;
});
<span class="missing-if-branch" title="else path not taken" >E</span>if (dbService) {
for (var key in dbService) {
if (FIELDS_WHICH_MODIFICATION_TRIGGER_SERVICE_RESTART.indexOf(key) > -1) {
if (propertyModified(dbService[key], runningService[key])) {
debug('property ' + key + ' from service ' + dbService.name + ' changed.');
debug('db:');
debug(dbService[key]);
debug('running service:');
debug(runningService[key]);
modified.push(dbService);
break;
}
}
else {
debug('detected changed in field ' + key + '. Ignored');
}
}
}
});
return modified;
};
Sentinel.prototype._tick = <span class="fstat-no" title="function not covered" >function () {</span>
<span class="cstat-no" title="statement not covered" > var self = this;</span>
<span class="cstat-no" title="statement not covered" > this.storage.getServices({}, <span class="fstat-no" title="function not covered" >function (err, services) {</span></span>
<span class="cstat-no" title="statement not covered" > var newServices = self._findAdded(services, self.watchmen.services);</span>
<span class="cstat-no" title="statement not covered" > if (newServices.length) {</span>
<span class="cstat-no" title="statement not covered" > newServices.forEach(<span class="fstat-no" title="function not covered" >function (service) {</span></span>
<span class="cstat-no" title="statement not covered" > console.log('service added: ', service.name);</span>
<span class="cstat-no" title="statement not covered" > self.watchmen.addService(service);</span>
});
}
<span class="cstat-no" title="statement not covered" > var removedServices = self._findRemoved(services, self.watchmen.services);</span>
<span class="cstat-no" title="statement not covered" > if (removedServices.length) {</span>
<span class="cstat-no" title="statement not covered" > removedServices.forEach(<span class="fstat-no" title="function not covered" >function (s) {</span></span>
<span class="cstat-no" title="statement not covered" > self.watchmen.removeService(s.id);</span>
<span class="cstat-no" title="statement not covered" > console.log('service removed: ', s.name);</span>
});
}
<span class="cstat-no" title="statement not covered" > var modifiedServices = self._findModified(services, self.watchmen.services);</span>
<span class="cstat-no" title="statement not covered" > if (modifiedServices.length) {</span>
<span class="cstat-no" title="statement not covered" > modifiedServices.forEach(<span class="fstat-no" title="function not covered" >function (s) {</span></span>
<span class="cstat-no" title="statement not covered" > self.watchmen.removeService(s.id);</span>
<span class="cstat-no" title="statement not covered" > self.watchmen.addService(s);</span>
<span class="cstat-no" title="statement not covered" > console.log('changes detected in service: ', s.name, '. Restarting...');</span>
});
}
});
};
Sentinel.prototype.watch = <span class="fstat-no" title="function not covered" >function () {</span>
<span class="cstat-no" title="statement not covered" > var self = this;</span>
<span class="cstat-no" title="statement not covered" > clearInterval(timeoutId);</span>
<span class="cstat-no" title="statement not covered" > timeoutId = setInterval(<span class="fstat-no" title="function not covered" >function () {</span></span>
<span class="cstat-no" title="statement not covered" > self._tick();</span>
}, this.options.interval || DEFAULT_INTERVAL);
};
</pre></td></tr>
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