Windshaft-cartodb/lib/cartodb/monitoring/health_check.js
2015-03-16 00:07:05 +01:00

91 lines
2.1 KiB
JavaScript

var _ = require('underscore'),
dot = require('dot'),
fs = require('fs'),
path = require('path'),
Step = require('step');
function HealthCheck(metadataBackend, tilelive) {
this.metadataBackend = metadataBackend;
this.tilelive = tilelive;
}
module.exports = HealthCheck;
var mapnikOptions = {
query: {
metatile: 1,
poolSize: 4,
bufferSize: 64
},
protocol: 'mapnik:',
slashes: true,
xml: null
};
var xmlTemplate = dot.template(fs.readFileSync(path.resolve(__dirname, 'map-config.xml'), 'utf-8'));
HealthCheck.prototype.check = function(config, callback) {
var self = this,
startTime,
result = {
redis: {
ok: false
},
mapnik: {
ok: false
},
tile: {
ok: false
}
};
var mapnikXmlParams = config;
Step(
function getDBParams() {
startTime = Date.now();
self.metadataBackend.getAllUserDBParams(config.username, this);
},
function loadMapnik(err, dbParams) {
if (err) {
throw err;
}
result.redis = {
ok: !err,
elapsed: Date.now() - startTime,
size: Object.keys(dbParams).length
};
mapnikOptions.xml = xmlTemplate(mapnikXmlParams);
startTime = Date.now();
self.tilelive.load(mapnikOptions, this);
},
function getTile(err, source) {
if (err) {
throw err;
}
result.mapnik = {
ok: !err,
elapsed: Date.now() - startTime
};
startTime = Date.now();
source.getTile(config.z, config.x, config.y, this);
},
function handleTile(err, tile) {
result.tile = {
ok: !err
};
if (tile) {
result.tile.elapsed = Date.now() - startTime;
result.tile.size = tile.length;
}
callback(err, result);
}
);
};