HarmonyOS--waterapp/mqtt-backend/node_modules/aedes/test/events.js

'use strict'

const { test } = require('tap')
const mqemitter = require('mqemitter')
const { setup, connect, subscribe } = require('./helper')
const aedes = require('../')

test('publishes an hearbeat', function (t) {
  t.plan(2)

  const broker = aedes({
    heartbeatInterval: 10 // ms
  })
  t.teardown(broker.close.bind(broker))

  broker.subscribe('$SYS/+/heartbeat', function (message, cb) {
    const id = message.topic.match(/\$SYS\/([^/]+)\/heartbeat/)[1]
    t.equal(id, broker.id, 'broker id matches')
    t.same(message.payload.toString(), id, 'message has id as the payload')
    cb()
  })
})

test('publishes birth', function (t) {
  t.plan(4)

  const mq = mqemitter()
  const brokerId = 'test-broker'
  const fakeBroker = 'fake-broker'
  const clientId = 'test-client'

  mq.on(`$SYS/${brokerId}/birth`, (message, cb) => {
    t.pass('broker birth received')
    t.same(message.payload.toString(), brokerId, 'message has id as the payload')
    cb()
  })

  const broker = aedes({
    id: brokerId,
    mq
  })

  broker.on('client', (client) => {
    t.equal(client.id, clientId, 'client connected')
    // set a fake counter on a fake broker
    process.nextTick(() => {
      broker.clients[clientId].duplicates[fakeBroker] = 42
      mq.emit({ topic: `$SYS/${fakeBroker}/birth`, payload: Buffer.from(fakeBroker) })
    })
  })

  mq.on(`$SYS/${fakeBroker}/birth`, (message, cb) => {
    process.nextTick(() => {
      t.equal(!!broker.clients[clientId].duplicates[fakeBroker], false, 'client duplicates has been resetted')
      cb()
    })
  })

  const s = connect(setup(broker), { clientId })
  t.teardown(s.broker.close.bind(s.broker))
})

;['$mcollina', '$SYS'].forEach(function (topic) {
  test('does not forward $ prefixed topics to # subscription - ' + topic, function (t) {
    t.plan(4)

    const s = connect(setup())
    t.teardown(s.broker.close.bind(s.broker))

    subscribe(t, s, '#', 0, function () {
      s.outStream.once('data', function (packet) {
        t.fail('no packet should be received')
      })

      s.broker.mq.emit({
        cmd: 'publish',
        topic: topic + '/hello',
        payload: 'world'
      }, function () {
        t.pass('nothing happened')
      })
    })
  })

  test('does not forward $ prefixed topics to +/# subscription - ' + topic, function (t) {
    t.plan(4)

    const s = connect(setup())
    t.teardown(s.broker.close.bind(s.broker))

    subscribe(t, s, '+/#', 0, function () {
      s.outStream.once('data', function (packet) {
        t.fail('no packet should be received')
      })

      s.broker.mq.emit({
        cmd: 'publish',
        topic: topic + '/hello',
        payload: 'world'
      }, function () {
        t.pass('nothing happened')
      })
    })
  })
})

test('does not store $SYS topics to QoS 1 # subscription', function (t) {
  t.plan(3)

  const broker = aedes()
  t.teardown(broker.close.bind(broker))

  const opts = { clean: false, clientId: 'abcde' }
  let s = connect(setup(broker), opts)

  subscribe(t, s, '#', 1, function () {
    s.inStream.end()

    s.broker.publish({
      cmd: 'publish',
      topic: '$SYS/hello',
      payload: 'world',
      qos: 1
    }, function () {
      s = connect(setup(broker), { clean: false, clientId: 'abcde' })

      s.outStream.once('data', function (packet) {
        t.fail('no packet should be received')
      })
    })
  })
})

test('Emit event when receives a ping', { timeout: 2000 }, function (t) {
  t.plan(5)

  const broker = aedes()
  t.teardown(broker.close.bind(broker))

  broker.on('ping', function (packet, client) {
    if (client && client) {
      t.equal(client.id, 'abcde')
      t.equal(packet.cmd, 'pingreq')
      t.equal(packet.payload, null)
      t.equal(packet.topic, null)
      t.equal(packet.length, 0)
    }
  })

  const s = connect(setup(broker), { clientId: 'abcde' })

  s.inStream.write({
    cmd: 'pingreq'
  })
})

test('Emit event when broker closed', function (t) {
  t.plan(1)

  const broker = aedes()
  broker.once('closed', function () {
    t.ok(true)
  })
  broker.close()
})

test('Emit closed event one only when double broker.close()', function (t) {
  t.plan(4)

  const broker = aedes()
  broker.on('closed', function () {
    t.pass('closed')
  })
  t.notOk(broker.closed)
  broker.close()
  t.ok(broker.closed)
  broker.close()
  t.ok(broker.closed)
})

test('Test backpressure aedes published function', function (t) {
  t.plan(2)

  let publishCount = 10
  let count = 0

  const broker = aedes({
    published: function (packet, client, done) {
      if (client) {
        count++
        setTimeout(() => {
          publisher.end()
          done()
        })
      } else { done() }
    }
  })

  const mqtt = require('mqtt')
  const server = require('net').createServer(broker.handle)
  let publisher

  server.listen(0, function () {
    const port = server.address().port
    publisher = mqtt.connect({ port, host: 'localhost', clean: true, keepalive: 30 })

    function next () {
      if (--publishCount > 0) { process.nextTick(publish) }
    }

    function publish () {
      publisher.publish('test', 'payload', next)
    }

    publisher.on('connect', publish)
    publisher.on('end', function () {
      t.ok(count > publishCount)
      t.equal(publishCount, 0)
      broker.close()
      server.close()
    })
  })
})

test('clear closed clients when the same clientId is managed by another broker', function (t) {
  t.plan(2)

  const clientId = 'closed-client'
  const aedesBroker = aedes()

  // simulate a closed client on the broker
  aedesBroker.clients[clientId] = { closed: true, broker: aedesBroker }
  aedesBroker.connectedClients = 1

  // simulate the creation of the same client on another broker of the cluster
  aedesBroker.publish({ topic: '$SYS/anotherbroker/new/clients', payload: clientId }, () => {
    t.equal(aedesBroker.clients[clientId], undefined) // check that the closed client was removed
    t.equal(aedesBroker.connectedClients, 0)
  })

  t.teardown(aedesBroker.close.bind(aedesBroker))
})