stat.js
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var fs = require('fs');
var moment = require('moment');
var helper = require('../lib/helper');
var _ = require('lodash');
var alarm = require('./alarm');
/*
* parameters:
* dirname: string
* rotation: interger (ms)
* maxsize: interger (byte)
* interval: interger (ms)
* data: array (array of object)
* alarm: object (alarm object)
*/
function stat(dirname, opts, alarmData) {
opts = opts || {};
alarmData = alarmData || {};
this.dirname = dirname;
this.rotation = opts.rotation || 15 * 60 * 1000;
this.maxsize = opts.maxsize || 20000;
this.filename = opts.filename || '[log]YYYY-MM-DDTHH-mm-ss[_${count}.txt]';
this.currentsize = 0;
this.timestamp = 0;
this.foldername = 'stat/';
this.intervalId = undefined;
this.interval = opts.interval || 60 * 1000;
this.data = transformKeys(opts.data);
this.rules = opts.data;
this.alarm = new alarm(dirname, alarmData);
helper.mkdirIfNotExist(`${this.dirname}/${this.foldername}`);
};
function transformKeys(data) {
keys = _.map(data, function (obj) {
var fakey = {};
fakey[obj.key] = 0;
return fakey;
});
return _.reduce(keys, function (new_obj, obj) {
return _.merge(new_obj, obj);
}, {});
};
/*
* parameters:
* data: obj
* rules: [obj]
*/
function alarmDataOutOfThreshold(data, rules) {
_alarm = [];
_.forEach(data, function (v, k) {
rule = _.find(rules, ['key', k]);
var alarmObj = {};
if (v < rule.threshold_inv) {
_alarm.push({
key: k,
count: v,
threshold_inv: rule.threshold_inv,
message: `${k} count is below inverted threshold`
});
}
if (v > rule.threshold) {
_alarm.push({
key: k,
count: v,
threshold: rule.threshold,
message: `${k} count is above threshold`
});
}
});
return _alarm
};
/*
* parameters:
* data: any
*/
stat.prototype.appendStat = function (data) {
data = this.formatData(data);
this.currentsize = this.currentsize + helper.getLengthOfContent(data);
fs.appendFile(this.getDir(), data, function (err) {});
};
/*
* parameters:
* none
*/
stat.prototype.start = function () {
var self = this;
this.intervalId = setInterval(function () {
var alarmData = alarmDataOutOfThreshold(self.data, self.rules);
if (!_.isEmpty(alarmData)) {
self.alarm.appendAlarm(alarmData);
}
self.appendStat(self.data);
self.reset();
}, self.interval);
};
/*
* parameters:
* none
*/
stat.prototype.stop = function () {
clearInterval(this.intervalId);
};
/*
* parameters:
* data: string
*/
stat.prototype.increment = function (data) {
if (_.has(this.data, data)) {
this.data[data]++;
} else this.data[data] = 1;
};
/*
* parameters:
* none
*/
stat.prototype.reset = function () {
var self = this;
_.forEach(this.data, function (v, k) {
self.data[k] = 0;
});
};
/*
* parameters:
* none
*/
stat.prototype.getDir = function () {
var time = moment(Math.floor((+moment()) / this.rotation) * this.rotation);
this.resetCurrentSize(time.unix());
var count = this.getCount();
time = time.format(this.filename.replace("${count}", count));
return `${this.dirname}${this.foldername}${time}`;
};
/*
* parameters:
* time_unix: string
*/
stat.prototype.resetCurrentSize = function (time_unix) {
if (time_unix > this.timestamp) {
this.currentsize = 0
this.timestamp = time_unix;
}
};
/*
* parameters:
* none
*/
stat.prototype.getCount = function () {
var count = Math.floor((this.currentsize / this.maxsize) + 1);
return ((count * 1e-5).toFixed(5)).split('.')[1];
};
/*
* parameters:
* data: any
*/
stat.prototype.formatData = function (data) {
var date = moment().toISOString().trim();
var timestamp = moment().unix();
data = this._formatObject(data).trim();
return `${date} ${timestamp} ${data}\r\n`;
};
/*
* parameters:
* data: any
*/
stat.prototype._formatObject = function (data) {
return JSON.stringify(data);
};
module.exports = stat;