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const cache = require('memory-cache');
const fs = require('fs');
const i18n = require('i18n');
const path = require('path');
const url = require('url');
const Result = require('./result');
/**
* class Health
*
* @param {Object} opts
* - setup: health check setup object:
* each must have uri field, with optional ttl field (in milliseconds), and type-specific fields
*/
function Health(opts) {
opts = opts || {};
this.opts = {
setup: opts.setup || 'health.json',
locale: opts.locale || 'en'
};
i18n.configure({
locales: ['en', 'id'],
defaultLocale: 'en',
directory: path.join(__dirname, '../locales'),
updateFiles: false
});
i18n.setLocale(this.opts.locale);
}
/**
* Create a sample health.json setup file in current working directory.
*
* @param {Function} cb: standard cb(err, result) callback
*/
Health.prototype.init = function (cb) {
fs.copyFile(path.join(__dirname, '../examples/health.json'), 'health.json', cb);
};
/**
* Clear all cached check result for all resources.
*/
Health.prototype.clearCache = function () {
cache.clear();
};
/**
* Execute the checks contained in setup, in parallel.
* Each result will be cached depends on TTL setting for each URI,
*
* @param {Function} cb: standard cb(err, result) callback
*/
Health.prototype.check = function (cb) {
const TTL = 1;
var tasks = [],
self = this;
this.opts.setup.forEach(function (setup) {
var taskFn = function (setup, cb) {
Promise.resolve(setup.uri)
.then(function (uri) {
setup.uri = uri;
var checker = self._checker(setup.uri, setup.checker);
if (checker) {
var cached = cache.get(setup.uri),
startTime = Date.now();
if (cached === null) {
checker.check(setup, function (err, result) {
if (err) {
cb(err);
} else {
var endTime = Date.now();
result.setDuration(endTime - startTime);
result.setTimestamp(new Date(endTime));
// apply rules to each single result
result = self._singleResultRules(result, setup);
cache.put(setup.uri, result, setup.ttl || TTL);
cb(null, result);
}
});
} else {
cb(null, cached);
}
} else {
cb(new Error(i18n.__('Unsupported protocol for URI %s', uri)));
}
})
.catch(function (err) {
var result = new Result();
result.addError(err.message);
result.setStatusByStats();
setup.uri = '';
result = self._singleResultRules(result, setup);
cb(null, result);
});
};
tasks.push(taskFn.bind(this, setup));
});
// Convert callback-based tasks to Promise-based tasks
const promiseTasks = tasks.map(task => new Promise((resolve, reject) => {
task((err, result) => {
if (err) {
reject(err);
} else {
resolve(result);
}
});
}));
Promise.all(promiseTasks)
.then(results => cb(null, results))
.catch(err => cb(err));
};
Health.prototype._singleResultRules = function (result, setup) {
// basic info
Eif (setup.name) {
result.setName(setup.name);
}
result.setUri(setup.uri);
// camouflage fail status as warn when lenient is true
if (setup.lenient === true && (result.isFail() || result.isError())) {
result.warning();
}
// mask password
var parsedUri = url.parse(result.getUri());
if (parsedUri.auth) {
var userPass = parsedUri.auth.split(':');
userPass[1] = userPass[1].replace(/./g, '*');
parsedUri.auth = userPass.join(':');
result.setUri(url.format(parsedUri));
}
return result;
};
Health.prototype._multiResultsRules = function (results, setup) {
var groups = {};
function addToGroup(result, group, index) {
if (!groups[group]) {
groups[group] = [];
}
// store index to avoid re-iterating the whole result
// for each group when changing the status
groups[group].push({ index: index, result: result });
}
for (var i = 0, ln = results.length; i < ln; i += 1) {
if (setup[i].group) {
addToGroup(results[i], setup[i].group, i);
}
}
// threshold is specified as suffix in group name
function _getThreshold(group) {
var threshold;
if (group.match(/\-[0-9]{1,3}$/)) {
var elems = group.split('-');
threshold = parseInt(elems[elems.length - 1], 10);
}
return threshold;
}
function _isSuccess(members, threshold) {
var successCount = 0;
members.forEach(function (member) {
if (member.isSuccess()) {
successCount += 1;
}
});
// if threshold is undefined, it's considered a success as
// long as the calculated threshold is greater than 0 (at least one success).
// if threshold is defined, then it's considered a success
// when the calculated threshold is equal or greater to the threshold
return threshold ?
(successCount * 100 / members.length) >= threshold :
(successCount * 100 / members.length) > 0;
}
Object.keys(groups).forEach(function (group) {
var members = groups[group].map(item => item.result),
indices = groups[group].map(item => item.index),
isSuccess = _isSuccess(members, _getThreshold(group));
indices.forEach(function (index) {
var result = results[index];
// if group check is considered a success, change all error and fail to warning
if (isSuccess) {
if (result.isFail() || result.isError()) {
result.warning();
}
// if group check is not considered a success, change warning to fail
} else {
if (result.isWarning()) {
result.fail();
}
}
});
});
return results;
};
Health.prototype._checker = function (uri, checkerName) {
var checker,
protocol = uri.match(/^(.+):\/\//);
try {
checker = require('./checkers/' + (checkerName || protocol[1]));
} catch (e) {
// unsupported protocol
}
return checker;
};
module.exports = Health;
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