index.js
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const debug = require('debug')('apm-agent');
const EventEmitter = require('events');
const request = require('request');
/**
* buffer message and send them in a bulk
*
* const options =
* {
* host:'xxx.xxx.xxx',
* port:80,
* db:'xxxxx',
* measurement:'api-duration'
* duration:2000 //ms per 200 send message,
* records:100 //when message over 100 send them
* immediate: true // send message immediate not wart records count if true
* path: "/url", // set target path default is /write
* }
*/
class Sender extends EventEmitter {
constructor(options) {
super();
this.bulks = [];
this.batchMessages = [];
this.options = options;
this.options.duration = this.options.duration || 2000;
this.options.records = this.options.records || 100;
this.options.path = this.options.path || '/write';
this.options.port = this.options.port || 80;
if (!this.options.db || !this.options.host) {
console.error('config error: db or host undefined!');
return;
}
if (this.options.immediate) {
return;
}
// pre duration send array
setInterval(() => {
this._send();
debug('batchMessages duration sent!');
}, this.options.duration);
}
/**
* add message to batchMessage
*
* @example
* {
* measurement:'test',
* tags:{
* type:'api',
* preqID:'MdHy21313',
* api:'app.brand.newBrandList',
* route:'/sada/dsa/test'
* },
* fields:{
* duration:123
* }
* }
* @param {Object} message
*/
addMessage(message) {
message.time = message.time || new Date().getTime();
debug('add message! %O', message);
this.batchMessages.push(message);
if ((this.batchMessages.length > this.options.records) || this.options.immediate) {
this._send();
debug('batchMessages over records and sent!');
}
}
/**
* use tcp send message
* @private
*/
_send() {
if (!this.options.db || !this.options.host) {
return;
}
const len = this.batchMessages.length;
if (len < 1) {
debug('batchMessages is empty!');
return;
}
const bulk = this.batchMessages.splice(0, len);
debug('send bulkMessages! %O', bulk);
const options = {
headers: {
'content-type': 'application/json'
},
url: `http://${this.options.host}:${this.options.port}${this.options.path}`,
qs: {
db: this.options.db
},
method: 'POST',
body: JSON.stringify(bulk)
};
request(options, (error, res, body) => {
if (error) {
debug('send error: %O', error);
console.error(error);
this.emit('sendError', error);
return;
}
debug('status code: %o', res.statusCode);
if (res.statusCode !== 204) {
console.error(`Send failed! statusCode:${res.statusCode}`);
console.error(body);
this.emit('failed', res.statusCode);
} else {
this.emit('ok', res.statusCode);
}
});
}
}
module.exports = Sender;