Extremely hacky initial commit.
Right now it's very, very, barely capable of message querying. It can: * Run one-shot requests against all known events. * Run real-time requests, pushing each matching event to the frontend.
This commit is contained in:
Sage Vaillancourt
Sage Vaillancourt
commit
cdc218f2bf
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@ -0,0 +1,9 @@
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# Default ignored files
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/shelf/
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/workspace.xml
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# Editor-based HTTP Client requests
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/httpRequests/
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# Datasource local storage ignored files
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/dataSources/
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/dataSources.local.xml
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.idea/
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@ -0,0 +1,175 @@
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const { Kafka } = require('kafkajs');
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const { readConfig, storeConfig } = require('./config')
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const express = require('express');
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const cors = require('cors')
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const ws = require('ws')
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const path = require('path');
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const cookieParser = require('cookie-parser');
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const logger = require('morgan');
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const query = require('./query')
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const config = readConfig()
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console.log('CONFIG', config)
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const buildCluster = clusterConfig => {
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const kafkaConfig = {...clusterConfig}
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delete kafkaConfig.clusterName
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const kafka = new Kafka(kafkaConfig)
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const admin = kafka.admin()
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admin.connect().catch(console.error)
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return {
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kafka,
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admin,
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config: clusterConfig
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}
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}
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const clusters =
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Object.fromEntries(Object.entries(config.clusters)
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.map(([clusterName, clusterData]) => [clusterName, buildCluster(clusterData)]))
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console.log('CLUSTERS', clusters)
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const app = express();
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app.use(cors({
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origin: 'http://localhost:5173'
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}))
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app.use(logger('dev'));
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app.use(express.json());
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app.use(express.urlencoded({ extended: false }));
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app.use(cookieParser());
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app.use(express.static(path.join(__dirname, 'public')));
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const consumers = new Map()
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require('./safely-exit')(consumers, clusters)
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const router = express.Router()
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/* GET topics listing. */
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router.get('/topics/:cluster', async (req, res, _next) => {
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const legalName = topicName => !topicName.startsWith("__")
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const topicList = await clusters[req.params.cluster]?.admin.listTopics()
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if (topicList) {
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res.send(topicList.filter(legalName))
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} else {
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res.send([])
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//res.status(400).send({error: 'Invalid cluster name'})
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}
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})
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const passwordPlaceholder = 'XXXXXXXXXXXXXXXXXXXXXXXXXXXX'
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router.get('/clusters', async (req, res, _next) => {
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res.send(Object.fromEntries(
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Object.entries(clusters).map(([key, value]) => {
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value = JSON.parse(JSON.stringify(value))
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value.config.sasl.password = passwordPlaceholder
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return [key, value.config]
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})))
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})
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router.post('/clusters', async (req, res, _next) => {
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console.log('/clusters post body', req.body)
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res.send('')
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})
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router.put('/clusters', async (req, res, _next) => {
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console.log('/clusters put body', req.body)
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const hasPlaceholderPassword = req.body.sasl.password === passwordPlaceholder
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console.log('Has placeholder password:', hasPlaceholderPassword)
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const clusterName = req.body.clusterName
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if (hasPlaceholderPassword) {
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req.body.password = config.clusters[clusterName].password
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}
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config.clusters[clusterName] = req.body
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clusters[clusterName] = buildCluster(req.body)
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res.send('')
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await storeConfig(config)
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})
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app.use(router)
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const realTimeSearch = async ({ cluster, searchCode, immutable, socket, topic }) => {
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return query.realTimeMessageSearch({
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kafka: clusters[cluster].kafka,
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topic,
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searchCode,
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immutable,
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onMessage: message => {
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socket.send(JSON.stringify({
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type: 'message',
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message
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}))
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}
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})
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}
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const search = async ({ cluster, searchCode, immutable, socket, topic, maxItems }) => {
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return query.searchMessages({
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kafka: clusters[cluster].kafka,
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topic,
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maxItems,
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searchCode,
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immutable,
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onDone: messages => {
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console.log(messages.length + ' messages')
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socket.send(JSON.stringify({
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type: 'complete',
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message: messages
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}))
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},
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onBatchDone: count => {
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socket.send(JSON.stringify({
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type: 'item_count',
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message: count
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}))
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}
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})
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}
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const wsServer = new ws.WebSocketServer({
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noServer: true
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})
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wsServer.on('connection', socket => {
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socket.on('close', async () => {
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await killConsumer(consumers.get(socket))
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consumers.delete(socket)
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})
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socket.on('message', async message => {
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socket.send('Loading...')
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message = JSON.parse(message)
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const currentMode = message.mode === 'realTime' ? realTimeSearch : search
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const run = async () => consumers.set(socket, await currentMode({
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cluster: clusters[message.cluster].kafka,
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searchCode: message.searchCode,
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immutable: message.immutable,
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topic: message.topic,
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maxItems: message.maxItems,
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socket
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}))
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run().catch(async e => {
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console.error('run() error occurred!', e.toString())
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await killConsumer(consumers.get(socket))
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// Try again ONCE on failure
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run().catch(e => socket.send('ERROR: ' + e))
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})
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})
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})
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const killConsumer = async consumer => {
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await consumer?.stop()
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await consumer?.disconnect()
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}
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module.exports = {
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app,
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wsServer
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}
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@ -0,0 +1,96 @@
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#!/usr/bin/env node
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/**
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* Module dependencies.
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*/
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const { app, wsServer } = require('../app');
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const debug = require('debug')('kafka-dance:server');
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const http = require('http');
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/**
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* Get port from environment and store in Express.
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*/
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const port = normalizePort(process.env.PORT || '3000');
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app.set('port', port);
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/**
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* Create HTTP server.
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*/
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const server = http.createServer(app);
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/**
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* Listen on provided port, on all network interfaces.
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*/
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server.listen(port);
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server.on('error', onError);
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server.on('listening', onListening);
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server.on('upgrade', (request, socket, head) => {
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wsServer.handleUpgrade(request, socket, head, sock => {
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wsServer.emit('connection', sock, request)
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console.log('wsServer.emit connection')
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})
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})
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||||
/**
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* Normalize a port into a number, string, or false.
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*/
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function normalizePort(val) {
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const port = parseInt(val, 10);
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if (isNaN(port)) {
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// named pipe
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return val;
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}
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if (port >= 0) {
|
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// port number
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return port;
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}
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return false;
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}
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|
||||
/**
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* Event listener for HTTP server "error" event.
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*/
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||||
function onError(error) {
|
||||
if (error.syscall !== 'listen') {
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throw error;
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}
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|
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const bind = typeof port === 'string'
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? 'Pipe ' + port
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: 'Port ' + port;
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|
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// handle specific listen errors with friendly messages
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switch (error.code) {
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case 'EACCES':
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console.error(bind + ' requires elevated privileges');
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process.exit(1);
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break;
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case 'EADDRINUSE':
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console.error(bind + ' is already in use');
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process.exit(1);
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break;
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default:
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throw error;
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}
|
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}
|
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|
||||
/**
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* Event listener for HTTP server "listening" event.
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*/
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function onListening() {
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const addr = server.address();
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const bind = typeof addr === 'string'
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? 'pipe ' + addr
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: 'port ' + addr.port;
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debug('Listening on ' + bind);
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}
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|
|
@ -0,0 +1,29 @@
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const fs = require('fs')
|
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const path = require('path')
|
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const homedir = require('os').homedir()
|
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|
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const configFilePath = homedir + path.sep + '.kafka-dance'
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|
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const emptyConfig = () => ({
|
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clusters: {}
|
||||
})
|
||||
|
||||
const readConfig = () => {
|
||||
if (!fs.existsSync(configFilePath)) {
|
||||
return emptyConfig()
|
||||
}
|
||||
try {
|
||||
return JSON.parse(fs.readFileSync(configFilePath).toString())
|
||||
} catch (e) {
|
||||
console.error(e.toString())
|
||||
return emptyConfig()
|
||||
}
|
||||
}
|
||||
|
||||
const storeConfig = async config =>
|
||||
fs.writeFile(configFilePath, JSON.stringify(config, null, 2), console.error)
|
||||
|
||||
module.exports = {
|
||||
readConfig,
|
||||
storeConfig
|
||||
}
|
||||
|
|
@ -0,0 +1,996 @@
|
|||
{
|
||||
"name": "kafka-dance",
|
||||
"version": "0.0.0",
|
||||
"lockfileVersion": 2,
|
||||
"requires": true,
|
||||
"packages": {
|
||||
"": {
|
||||
"name": "kafka-dance",
|
||||
"version": "0.0.0",
|
||||
"dependencies": {
|
||||
"cookie-parser": "~1.4.4",
|
||||
"cors": "^2.8.5",
|
||||
"debug": "~2.6.9",
|
||||
"express": "~4.16.1",
|
||||
"kafkajs": "^2.1.0",
|
||||
"morgan": "~1.9.1",
|
||||
"ws": "^8.8.1"
|
||||
}
|
||||
},
|
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"node_modules/accepts": {
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"negotiator": "0.6.3"
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}
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}
|
||||
|
|
@ -0,0 +1,17 @@
|
|||
{
|
||||
"name": "kafka-dance",
|
||||
"version": "0.0.0",
|
||||
"private": true,
|
||||
"scripts": {
|
||||
"start": "node bin/www"
|
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},
|
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"dependencies": {
|
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"cookie-parser": "~1.4.4",
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"cors": "^2.8.5",
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"debug": "~2.6.9",
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"express": "~4.16.1",
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"kafkajs": "^2.1.0",
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"morgan": "~1.9.1",
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"ws": "^8.8.1"
|
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}
|
||||
}
|
||||
|
|
@ -0,0 +1,13 @@
|
|||
<html>
|
||||
|
||||
<head>
|
||||
<title>Express</title>
|
||||
<link rel="stylesheet" href="/stylesheets/style.css">
|
||||
</head>
|
||||
|
||||
<body>
|
||||
<h1>Express</h1>
|
||||
<p>Welcome to Kafka Dance</p>
|
||||
</body>
|
||||
|
||||
</html>
|
||||
|
|
@ -0,0 +1,8 @@
|
|||
body {
|
||||
padding: 50px;
|
||||
font: 14px "Lucida Grande", Helvetica, Arial, sans-serif;
|
||||
}
|
||||
|
||||
a {
|
||||
color: #00B7FF;
|
||||
}
|
||||
|
|
@ -0,0 +1,157 @@
|
|||
const buildMatcher = code => new Function('message', 'value', code)
|
||||
|
||||
const deepCopy = obj => JSON.parse(JSON.stringify(obj))
|
||||
|
||||
const realTimeMessageSearch = async ({ kafka, topic, onMessage, searchCode, immutable = true }) => {
|
||||
const consumer = kafka.consumer({ groupId: 'sage-testing-group' })
|
||||
|
||||
console.log({ topic, onMessage, searchCode, immutable })
|
||||
await consumer.connect()
|
||||
await consumer.subscribe({ topic, fromBeginning: true })
|
||||
const matcher = searchCode && buildMatcher(searchCode)
|
||||
|
||||
const messages = []
|
||||
|
||||
console.log('consumer.run')
|
||||
await consumer.run({
|
||||
autoCommit: false,
|
||||
eachMessage: async ({ topic, partition, message }) => {
|
||||
const s = message.value.toString()
|
||||
const value = JSON.parse(s)
|
||||
delete value.Data
|
||||
message.value = value
|
||||
const workingMessage = immutable ? deepCopy(message) : message
|
||||
if (!matcher || matcher(workingMessage, workingMessage.value)) {
|
||||
onMessage(message)
|
||||
messages.push(message)
|
||||
//console.log(message)
|
||||
}
|
||||
},
|
||||
})
|
||||
|
||||
for (let i = 0; i <= 5; i++) {
|
||||
//console.log(`seek on partition ${i}`)
|
||||
await consumer.seek({topic, partition: i, offset: 0})
|
||||
}
|
||||
console.log('return consumer')
|
||||
return consumer
|
||||
}
|
||||
|
||||
const searchMessages = async ({ kafka, maxItems, topic, onDone, searchCode, onBatchDone, immutable = true }) => {
|
||||
const consumer = kafka.consumer({ groupId: 'sage-testing-group' })
|
||||
|
||||
await consumer.connect()
|
||||
await consumer.subscribe({ topic, fromBeginning: true })
|
||||
const matcher = searchCode && buildMatcher(searchCode)
|
||||
|
||||
const messages = []
|
||||
|
||||
await consumer.run({
|
||||
autoCommit: false,
|
||||
eachMessage: async ({ topic, partition, message }) => {
|
||||
const s = message.value.toString()
|
||||
const value = JSON.parse(s)
|
||||
delete value.Data
|
||||
message.value = value
|
||||
let workingMessage = immutable ? deepCopy(message) : message
|
||||
if (!matcher || matcher(workingMessage, workingMessage.value)) {
|
||||
messages.push(message)
|
||||
if (messages.length < maxItems) {
|
||||
onBatchDone(messages.length)
|
||||
} else {
|
||||
onBatchDone(maxItems)
|
||||
await consumer.stop()
|
||||
await consumer.disconnect()
|
||||
onDone(messages.slice(0, maxItems))
|
||||
}
|
||||
//console.log(message)
|
||||
}
|
||||
},
|
||||
})
|
||||
|
||||
/*
|
||||
* 1. We need to know which partitions we are assigned.
|
||||
* 2. Which partitions have we consumed the last offset for
|
||||
* 3. If all partitions have 0 lag, we exit.
|
||||
*/
|
||||
|
||||
/*
|
||||
* `consumedTopicPartitions` will be an object of all topic-partitions
|
||||
* and a boolean indicating whether or not we have consumed all
|
||||
* messages in that topic-partition. For example:
|
||||
*
|
||||
* {
|
||||
* "topic-test-0": false,
|
||||
* "topic-test-1": false,
|
||||
* "topic-test-2": false
|
||||
* }
|
||||
*/
|
||||
let consumedTopicPartitions = {}
|
||||
consumer.on(consumer.events.GROUP_JOIN, async ({ payload }) => {
|
||||
//console.log('GROUP_JOIN')
|
||||
const { memberAssignment } = payload
|
||||
consumedTopicPartitions = Object.entries(memberAssignment).reduce(
|
||||
(topics, [topic, partitions]) => {
|
||||
for (const partition in partitions) {
|
||||
topics[`${topic}-${partition}`] = false
|
||||
}
|
||||
return topics
|
||||
},
|
||||
{}
|
||||
)
|
||||
})
|
||||
|
||||
/*
|
||||
* This is extremely unergonomic, but if we are currently caught up to the head
|
||||
* of all topic-partitions, we won't actually get any batches, which means we'll
|
||||
* never find out that we are actually caught up. So as a workaround, what we can do
|
||||
* is to check in `FETCH_START` if we have previously made a fetch without
|
||||
* processing any batches in between. If so, it means that we received empty
|
||||
* fetch responses, meaning there was no more data to fetch.
|
||||
*
|
||||
* We need to initially set this to true, or we would immediately exit.
|
||||
*/
|
||||
//let processedBatch = true
|
||||
consumer.on(consumer.events.FETCH_START, async () => {
|
||||
//console.log('FETCH_START')
|
||||
// This was part of the original code, but seems to cause a near-immediate exit
|
||||
//if (processedBatch === false) {
|
||||
// console.log('I DIE AT FETCH')
|
||||
// await consumer.disconnect()
|
||||
// process.exit(0)
|
||||
//}
|
||||
|
||||
//processedBatch = false
|
||||
})
|
||||
|
||||
/*
|
||||
* Now whenever we have finished processing a batch, we'll update `consumedTopicPartitions`
|
||||
* and exit if all topic-partitions have been consumed,
|
||||
*/
|
||||
consumer.on(consumer.events.END_BATCH_PROCESS, async ({ payload }) => {
|
||||
//console.log('END_BATCH_PROCESS')
|
||||
const { topic, partition, offsetLag } = payload
|
||||
consumedTopicPartitions[`${topic}-${partition}`] = offsetLag === '0'
|
||||
|
||||
if (Object.values(consumedTopicPartitions).every(Boolean)) {
|
||||
await consumer.stop()
|
||||
await consumer.disconnect()
|
||||
console.log(`I DIE AT BATCH with ${messages.length} messages`)
|
||||
onDone(messages)
|
||||
//process.exit(0)
|
||||
}
|
||||
|
||||
//processedBatch = true
|
||||
})
|
||||
|
||||
return consumer
|
||||
}
|
||||
|
||||
//run()
|
||||
// .then(() => console.log('DONE'))
|
||||
// .catch(e => console.error(`[example/consumer] ${e.message}`, e))
|
||||
|
||||
module.exports = {
|
||||
searchMessages,
|
||||
realTimeMessageSearch,
|
||||
}
|
||||
|
|
@ -0,0 +1,9 @@
|
|||
var express = require('express');
|
||||
var router = express.Router();
|
||||
|
||||
/* GET home page. */
|
||||
router.get('/', function(req, res, next) {
|
||||
res.render('index', { title: 'Express' });
|
||||
});
|
||||
|
||||
module.exports = router;
|
||||
|
|
@ -0,0 +1,9 @@
|
|||
var express = require('express');
|
||||
var router = express.Router();
|
||||
|
||||
/* GET users listing. */
|
||||
router.get('/', function(req, res, next) {
|
||||
res.send('respond with a resource');
|
||||
});
|
||||
|
||||
module.exports = router;
|
||||
|
|
@ -0,0 +1,40 @@
|
|||
const errorTypes = ['unhandledRejection', 'uncaughtException']
|
||||
const signalTraps = ['SIGTERM', 'SIGINT', 'SIGUSR2']
|
||||
|
||||
const disconnectAll = async () => {
|
||||
await Promise.all(Object.values(clusters).map(async cluster => cluster.admin.disconnect()))
|
||||
await Promise.all(
|
||||
Array.from(consumers.values())
|
||||
.map(async consumer => consumer.disconnect()))
|
||||
}
|
||||
|
||||
errorTypes.map(type => {
|
||||
process.on(type, async e => {
|
||||
try {
|
||||
console.log(`process.on ${type}`)
|
||||
console.error(e)
|
||||
await disconnectAll()
|
||||
process.exit(0)
|
||||
} catch (_) {
|
||||
process.exit(1)
|
||||
}
|
||||
})
|
||||
})
|
||||
|
||||
signalTraps.map(type => {
|
||||
process.once(type, async () => {
|
||||
try {
|
||||
console.log('signalTrap: ' + type)
|
||||
await disconnectAll()
|
||||
} finally {
|
||||
process.kill(process.pid, type)
|
||||
}
|
||||
})
|
||||
})
|
||||
|
||||
let consumers
|
||||
let clusters
|
||||
module.exports = (consumerMap, clusterObject) => {
|
||||
consumers = consumerMap
|
||||
clusters = clusterObject
|
||||
}
|
||||
Loading…
Reference in New Issue