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import { AnalyticsTask, AnalyticsTaskType } from '../models/analytics_task_model';
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import { AnalyticsMessageMethod, AnalyticsMessage } from '../models/analytics_message_model';
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import * as config from '../config';
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import * as zmq from 'zeromq';
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import * as childProcess from 'child_process'
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import * as fs from 'fs';
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import * as path from 'path';
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export class AnalyticsService {
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private _requester: any;
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private _ready: boolean = false;
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private _pingResponded = false;
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private _zmqConnectionString: string = null;
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private _ipcPath: string = null;
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private _analyticsPinger: NodeJS.Timer = null;
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private _isClosed = false;
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private _productionMode = false;
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private _inDocker = false;
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constructor(private _onMessage: (message: AnalyticsMessage) => void) {
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this._productionMode = config.PRODUCTION_MODE;
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this._inDocker = config.INSIDE_DOCKER;
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this._init();
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}
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public async sendTask(task: AnalyticsTask): Promise<void> {
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if(!this._ready) {
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return Promise.reject("Analytics is not ready");
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}
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let method = task.type === AnalyticsTaskType.PUSH ?
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AnalyticsMessageMethod.DATA : AnalyticsMessageMethod.TASK
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let message = new AnalyticsMessage(
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method,
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task.toObject()
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);
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return this.sendMessage(message);
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}
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public async sendMessage(message: AnalyticsMessage): Promise<void> {
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let strMessage = JSON.stringify(message);
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return this.sendText(strMessage);
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}
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public async sendText(text: string): Promise<void> {
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return new Promise<void>((resolve, reject) => {
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this._requester.send(text, undefined, (err: any) => {
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if(err) {
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console.trace(`got error while sending ${err}`);
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reject(err);
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} else {
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resolve();
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}
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});
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});
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}
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public close() {
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this._isClosed = true;
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console.log('Terminating analytics service...');
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clearInterval(this._analyticsPinger);
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if(this._ipcPath !== null) {
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console.log('Remove ipc path: ' + this._ipcPath);
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fs.unlinkSync(this._ipcPath);
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}
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this._requester.close();
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console.log('Terminating successful');
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}
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public get ready(): boolean { return this._ready; }
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private async _init() {
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this._requester = zmq.socket('pair');
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this._zmqConnectionString = config.ZMQ_CONNECTION_STRING;
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if(this._zmqConnectionString.startsWith('ipc')) {
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this._ipcPath = AnalyticsService.createIPCAddress(this._zmqConnectionString);
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}
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console.log("Binding to zmq... %s", this._zmqConnectionString);
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this._requester.connect(this._zmqConnectionString);
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this._requester.on("message", this._onAnalyticsMessage.bind(this));
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console.log('Binding successful');
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if(this._productionMode && !this._inDocker) {
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console.log('Creating analytics process...');
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try {
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var cp = await AnalyticsService._runAnalyticsProcess(this._zmqConnectionString);
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} catch(error) {
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console.error('Can`t run analytics process: %s', error);
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return;
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}
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console.log('Analytics creating successful, pid: %s', cp.pid);
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}
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console.log('Start analytics pinger...');
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this._runAlalyticsPinger();
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console.log('Analytics pinger started');
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}
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/**
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* Spawns analytics process. Reads process stderr and fails if it isn`t empty.
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* No need to stop the process later.
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*
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* @returns Creaded child process
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* @throws Process start error or first exception during python start
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*/
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private static async _runAnalyticsProcess(zmqConnectionString: string): Promise<childProcess.ChildProcess> {
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let cp: childProcess.ChildProcess;
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let cpOptions = {
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cwd: config.ANALYTICS_PATH,
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env: {
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...process.env,
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ZMQ_CONNECTION_STRING: zmqConnectionString
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}
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};
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if(fs.existsSync(path.join(config.ANALYTICS_PATH, 'dist/server/server'))) {
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console.log('dist/server/server');
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cp = childProcess.spawn('dist/server/server', [], cpOptions);
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} else {
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const ANALYTICS_SERVER_PATH = path.join('bin', 'server');
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console.log('python3 ' + ANALYTICS_SERVER_PATH);
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// If compiled analytics script doesn't exist - fallback to regular python
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console.log(config.ANALYTICS_PATH);
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// maybe starting it via bash better that put python3
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cp = childProcess.spawn('python3', [ANALYTICS_SERVER_PATH], cpOptions);
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}
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if(cp.pid === undefined) {
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return new Promise<childProcess.ChildProcess>((resolve, reject) => {
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cp.on('error', reject);
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});
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}
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return new Promise<childProcess.ChildProcess>((resolve, reject) => {
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var resolved = false;
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cp.stdout.on('data', (data) => {
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console.log(data.toString());
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if(resolved) {
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return;
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}
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resolved = true;
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resolve(cp);
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});
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cp.stderr.on('data', (data) => {
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console.error(data.toString());
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if(resolved) {
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return;
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}
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resolved = true;
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reject(data);
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});
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});
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}
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private _onAnalyticsUp() {
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console.log('Analytics is up');
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}
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private async _onAnalyticsDown() {
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console.log('Analytics is down');
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if(this._productionMode && !this._inDocker) {
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await AnalyticsService._runAnalyticsProcess(this._zmqConnectionString);
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}
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}
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private _onAnalyticsMessage(data: any) {
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let text = data.toString();
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if(text === 'PONG') {
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this._pingResponded = true;
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if(!this._ready) {
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this._ready = true;
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this._onAnalyticsUp();
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}
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return;
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}
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let response;
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try {
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response = JSON.parse(text);
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} catch (e) {
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console.error("Can`t parse response from analytics as json:");
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console.error(text);
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throw new Error('Unexpected response');
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}
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this._onMessage(AnalyticsMessage.fromObject(response));
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}
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private async _runAlalyticsPinger() {
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this._analyticsPinger = setInterval(() => {
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if(this._isClosed) {
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return;
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}
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if(!this._pingResponded && this._ready) {
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this._ready = false;
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this._onAnalyticsDown();
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}
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this._pingResponded = false;
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// TODO: set life limit for this ping
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this.sendText('PING');
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}, config.ANLYTICS_PING_INTERVAL);
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}
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private static createIPCAddress(zmqConnectionString: string): string {
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let filename = zmqConnectionString.substring(6); //without 'ipc://'
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fs.writeFileSync(filename, '');
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return filename;
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}
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}
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