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statusmake.js
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statusmake.js
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/**
* Exposes a function which accepts an `inspectionSet` object and
* returns an express.js format route handler. When the route is invoked, the
* definitions in inspectionSet are executed and status object returned.
* @type {module}
*/
var _ = require('lodash');
var os = require('os');
var Promise = require('bluebird');
var childProcess = require('child_process');
var request = require('request');
var PerfTimer = require('performance-now');
var diskspace = Promise.promisifyAll(require('diskspace'));
var ensureHttp200 = Promise.promisify(function(url, callback) {
request(url, { timeout: 10000 }, function (error, response, body) {
if (error) {
return callback(error, false);
}
return callback(null, response.statusCode === 200);
});
});
var getCpuPercent = function(load) {
var numCpu = os.cpus().length;
var val = (load / numCpu) * 100;
return Math.round(val * 100) / 100;
};
var healthCheckServer = function() {
var result = {};
var memPercent = (process.memoryUsage().heapTotal / os.totalmem()) * 100;
result.process_memory_used_percent = Math.round(memPercent * 100) / 100;
result.uptime_minutes = Math.round((process.uptime() / 60) * 100) / 100;
var cpuLoad = os.loadavg();
result.cpu_one_minute_average_percent = getCpuPercent(cpuLoad[0]);
result.cpu_five_minute_average_percent = getCpuPercent(cpuLoad[1]);
result.hostname = os.hostname();
result.os_free_memory_mb = Math.round((os.freemem() / (1024 * 1024)) * 100) / 100;
return diskspace.checkAsync('/')
.then(function(data) {
var val = (data.used / data.total) * 100;
result.disk_root_use_percent = Math.round(val * 100) / 100;
return result;
})
.catch(function(err) {
// The library was unable to retrieve result
result.disk_root_use_percent = -1;
return result;
});
};
var allOk = function(statusFlags) {
return _.reduce(statusFlags, function(flag, n) { return n && flag; }, true);
};
var statusReply = function(serviceList, statusFlags) {
var overallFlag = allOk(statusFlags);
var zipped = _.zip(serviceList, statusFlags);
var services = [];
_.each(zipped, function(row) {
var serviceObj = row[0];
var code = row[1];
services.push({ name: serviceObj.name, active: code });
});
return {
status: overallFlag,
services: services
}
};
var executeApis = function(apis) {
if (apis) {
return Promise.map(apis, function(api) {
return ensureHttp200(api.url);
})
.then(_.partial(statusReply, apis));
}
return Promise.resolve([]);
};
var executeFunctions = function(functions) {
if (functions) {
return Promise.map(functions, function(serviceObj) {
return serviceObj.fn.call(null);
})
.then(_.partial(statusReply, functions));
}
return Promise.resolve([]);
};
var orchestrate = function(inspectionSet) {
var apis = inspectionSet.apis;
var functions = inspectionSet.functions;
var result = {};
var serverPromise = healthCheckServer()
.then(function(data) {
result.server = data;
});
var apisPromise = executeApis(apis)
.then(function(apiStatus) {
result.apis = apiStatus;
});
var functionsPromise = executeFunctions(functions)
.then(function(funcStatus) {
result.functions = funcStatus;
});
return Promise.join(apisPromise, functionsPromise, serverPromise)
.then(function() {
var responseStatus = 200;
// Todo: Pending discussion
// If we return 500 for bad check then the ELB will
// remove the box after 5 such failures. Which can be
// castastrophic in situations and also not having the
// box will inhibit investigations.
// if (!result.apis.status || !result.functions.status) {
// responseStatus = 500;
// }
return {
status: responseStatus,
data: result
};
});
};
var getHealthCheck = function(inspectionSet) {
return function(req, res, next) {
try {
orchestrate(inspectionSet)
.then(function(info) {
res.send(info.status, info);
})
.catch(function(err) {
res.send(200, { status: 200, data: { message: err.message } });
if (global.Raven) {
Raven.captureException(err);
}
});
} catch(e) {
// No point in failing this route
var resp = { message: e.message }
res.send(200, { status: 200, data: resp });
}
};
};
module.exports = {
getRouteHandler: getHealthCheck
}
module.exports.setupEndpoints = function (server, routeURI) {
server.get(routeURI, getHealthCheck);
};