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.

.gitignore

@@ -0,0 +1,9 @@
+# Default ignored files
+/shelf/
+/workspace.xml
+# Editor-based HTTP Client requests
+/httpRequests/
+# Datasource local storage ignored files
+/dataSources/
+/dataSources.local.xml
+.idea/

app.js

@@ -0,0 +1,175 @@
+const { Kafka } = require('kafkajs');
+
+const { readConfig, storeConfig } = require('./config')
+const express = require('express');
+const cors = require('cors')
+const ws = require('ws')
+const path = require('path');
+const cookieParser = require('cookie-parser');
+const logger = require('morgan');
+const query = require('./query')
+
+const config = readConfig()
+console.log('CONFIG', config)
+
+const buildCluster = clusterConfig => {
+  const kafkaConfig = {...clusterConfig}
+  delete kafkaConfig.clusterName
+
+  const kafka = new Kafka(kafkaConfig)
+  const admin = kafka.admin()
+  admin.connect().catch(console.error)
+  return {
+    kafka,
+    admin,
+    config: clusterConfig
+  }
+}
+
+const clusters =
+  Object.fromEntries(Object.entries(config.clusters)
+    .map(([clusterName, clusterData]) => [clusterName, buildCluster(clusterData)]))
+console.log('CLUSTERS', clusters)
+
+const app = express();
+
+app.use(cors({
+  origin: 'http://localhost:5173'
+}))
+app.use(logger('dev'));
+app.use(express.json());
+app.use(express.urlencoded({ extended: false }));
+app.use(cookieParser());
+app.use(express.static(path.join(__dirname, 'public')));
+
+const consumers = new Map()
+
+require('./safely-exit')(consumers, clusters)
+
+const router = express.Router()
+
+/* GET topics listing. */
+router.get('/topics/:cluster', async (req, res, _next) => {
+  const legalName = topicName => !topicName.startsWith("__")
+  const topicList = await clusters[req.params.cluster]?.admin.listTopics()
+  if (topicList) {
+    res.send(topicList.filter(legalName))
+  } else {
+    res.send([])
+    //res.status(400).send({error: 'Invalid cluster name'})
+  }
+})
+
+const passwordPlaceholder = 'XXXXXXXXXXXXXXXXXXXXXXXXXXXX'
+
+router.get('/clusters', async (req, res, _next) => {
+  res.send(Object.fromEntries(
+    Object.entries(clusters).map(([key, value]) => {
+      value = JSON.parse(JSON.stringify(value))
+      value.config.sasl.password = passwordPlaceholder
+      return [key, value.config]
+    })))
+})
+
+router.post('/clusters', async (req, res, _next) => {
+  console.log('/clusters post body', req.body)
+  res.send('')
+})
+
+router.put('/clusters', async (req, res, _next) => {
+  console.log('/clusters put body', req.body)
+
+  const hasPlaceholderPassword = req.body.sasl.password === passwordPlaceholder
+  console.log('Has placeholder password:', hasPlaceholderPassword)
+  const clusterName = req.body.clusterName
+  if (hasPlaceholderPassword) {
+    req.body.password = config.clusters[clusterName].password
+  }
+  config.clusters[clusterName] = req.body
+  clusters[clusterName] = buildCluster(req.body)
+  res.send('')
+  await storeConfig(config)
+})
+
+app.use(router)
+
+const realTimeSearch = async ({ cluster, searchCode, immutable, socket, topic }) => {
+  return query.realTimeMessageSearch({
+    kafka: clusters[cluster].kafka,
+    topic,
+    searchCode,
+    immutable,
+    onMessage: message => {
+      socket.send(JSON.stringify({
+        type: 'message',
+        message
+      }))
+    }
+  })
+}
+
+const search = async ({ cluster, searchCode, immutable, socket, topic, maxItems }) => {
+  return query.searchMessages({
+    kafka: clusters[cluster].kafka,
+    topic,
+    maxItems,
+    searchCode,
+    immutable,
+    onDone: messages => {
+      console.log(messages.length + ' messages')
+      socket.send(JSON.stringify({
+        type: 'complete',
+        message: messages
+      }))
+    },
+    onBatchDone: count => {
+      socket.send(JSON.stringify({
+        type: 'item_count',
+        message: count
+      }))
+    }
+  })
+}
+
+const wsServer = new ws.WebSocketServer({
+  noServer: true
+})
+
+wsServer.on('connection', socket => {
+  socket.on('close', async () => {
+    await killConsumer(consumers.get(socket))
+    consumers.delete(socket)
+  })
+
+  socket.on('message', async message => {
+    socket.send('Loading...')
+    message = JSON.parse(message)
+
+    const currentMode = message.mode === 'realTime' ? realTimeSearch : search
+    const run = async () => consumers.set(socket, await currentMode({
+      cluster: clusters[message.cluster].kafka,
+      searchCode: message.searchCode,
+      immutable: message.immutable,
+      topic: message.topic,
+      maxItems: message.maxItems,
+      socket
+    }))
+
+    run().catch(async e => {
+      console.error('run() error occurred!', e.toString())
+      await killConsumer(consumers.get(socket))
+      // Try again ONCE on failure
+      run().catch(e => socket.send('ERROR: ' + e))
+    })
+  })
+})
+
+const killConsumer = async consumer => {
+  await consumer?.stop()
+  await consumer?.disconnect()
+}
+
+module.exports = {
+  app,
+  wsServer
+}

bin/www

@@ -0,0 +1,96 @@
+#!/usr/bin/env node
+
+/**
+ * Module dependencies.
+ */
+
+const { app, wsServer } = require('../app');
+const debug = require('debug')('kafka-dance:server');
+const http = require('http');
+
+/**
+ * Get port from environment and store in Express.
+ */
+
+const port = normalizePort(process.env.PORT || '3000');
+app.set('port', port);
+
+/**
+ * Create HTTP server.
+ */
+
+const server = http.createServer(app);
+
+/**
+ * Listen on provided port, on all network interfaces.
+ */
+
+server.listen(port);
+server.on('error', onError);
+server.on('listening', onListening);
+server.on('upgrade', (request, socket, head) => {
+  wsServer.handleUpgrade(request, socket, head, sock => {
+    wsServer.emit('connection', sock, request)
+    console.log('wsServer.emit connection')
+  })
+})
+
+/**
+ * Normalize a port into a number, string, or false.
+ */
+
+function normalizePort(val) {
+  const port = parseInt(val, 10);
+
+  if (isNaN(port)) {
+    // named pipe
+    return val;
+  }
+
+  if (port >= 0) {
+    // port number
+    return port;
+  }
+
+  return false;
+}
+
+/**
+ * Event listener for HTTP server "error" event.
+ */
+
+function onError(error) {
+  if (error.syscall !== 'listen') {
+    throw error;
+  }
+
+  const bind = typeof port === 'string'
+    ? 'Pipe ' + port
+    : 'Port ' + port;
+
+  // handle specific listen errors with friendly messages
+  switch (error.code) {
+    case 'EACCES':
+      console.error(bind + ' requires elevated privileges');
+      process.exit(1);
+      break;
+    case 'EADDRINUSE':
+      console.error(bind + ' is already in use');
+      process.exit(1);
+      break;
+    default:
+      throw error;
+  }
+}
+
+/**
+ * Event listener for HTTP server "listening" event.
+ */
+
+function onListening() {
+  const addr = server.address();
+  const bind = typeof addr === 'string'
+    ? 'pipe ' + addr
+    : 'port ' + addr.port;
+  debug('Listening on ' + bind);
+}

config.js

@@ -0,0 +1,29 @@
+const fs = require('fs')
+const path = require('path')
+const homedir = require('os').homedir()
+
+const configFilePath = homedir + path.sep + '.kafka-dance'
+
+const emptyConfig = () => ({
+  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
+}

package-lock.json

@@ -0,0 +1,996 @@
+{
+  "name": "kafka-dance",
+  "version": "0.0.0",
+  "lockfileVersion": 2,
+  "requires": true,
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+      }
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+      "requires": {}
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+}

package.json

@@ -0,0 +1,17 @@
+{
+  "name": "kafka-dance",
+  "version": "0.0.0",
+  "private": true,
+  "scripts": {
+    "start": "node bin/www"
+  },
+  "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"
+  }
+}

public/index.html

@@ -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>

public/stylesheets/style.css

@@ -0,0 +1,8 @@
+body {
+  padding: 50px;
+  font: 14px "Lucida Grande", Helvetica, Arial, sans-serif;
+}
+
+a {
+  color: #00B7FF;
+}

query.js

@@ -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,
+}

routes/index.js

@@ -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;

routes/users.js

@@ -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;

safely-exit.js

@@ -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
+}