CartoDB-SQL-API/lib/monitoring/health-check.js

'use strict';

var step = require('step');
var fs = require('fs');

function HealthCheck (disableFile) {
    this.disableFile = disableFile;
}

module.exports = HealthCheck;

HealthCheck.prototype.check = function (callback) {
    var self = this;

    step(
        function getManualDisable () {
            fs.readFile(self.disableFile, this);
        },
        function handleDisabledFile (err, data) {
            var next = this;
            if (err) {
                return next();
            }
            if (data) {
                err = new Error(data);
                err.http_status = 503;
                throw err;
            }
        },
        function handleResult (err) {
            callback(err);
        }
    );
};