tests/pools/cluster/fixed.test.js

   1 const { expect } = require('expect')
   2 const { FixedClusterPool } = require('../../../lib/index')
   3 const WorkerFunctions = require('../../test-types')
   4 const TestUtils = require('../../test-utils')
   5 const numberOfWorkers = 10
   6 const pool = new FixedClusterPool(
   7   numberOfWorkers,
   8   './tests/worker-files/cluster/testWorker.js',
   9   {
  10     errorHandler: e => console.error(e)
  11   }
  12 )
  13 const emptyPool = new FixedClusterPool(
  14   1,
  15   './tests/worker-files/cluster/emptyWorker.js',
  16   { exitHandler: () => console.log('empty pool worker exited') }
  17 )
  18 const echoPool = new FixedClusterPool(
  19   1,
  20   './tests/worker-files/cluster/echoWorker.js'
  21 )
  22 const errorPool = new FixedClusterPool(
  23   1,
  24   './tests/worker-files/cluster/errorWorker.js',
  25   {
  26     errorHandler: e => console.error(e)
  27   }
  28 )
  29 const asyncErrorPool = new FixedClusterPool(
  30   1,
  31   './tests/worker-files/cluster/asyncErrorWorker.js',
  32   {
  33     errorHandler: e => console.error(e)
  34   }
  35 )
  36 const asyncPool = new FixedClusterPool(
  37   1,
  38   './tests/worker-files/cluster/asyncWorker.js'
  39 )
  40
  41 describe('Fixed cluster pool test suite', () => {
  42   after('Destroy all pools', async () => {
  43     // We need to clean up the resources after our test
  44     await echoPool.destroy()
  45     await asyncPool.destroy()
  46     await errorPool.destroy()
  47     await asyncErrorPool.destroy()
  48     await emptyPool.destroy()
  49   })
  50
  51   it('Choose worker round robin test', async () => {
  52     const results = new Set()
  53     for (let i = 0; i < numberOfWorkers; i++) {
  54       results.add(pool.chooseWorker().id)
  55     }
  56     expect(results.size).toBe(numberOfWorkers)
  57   })
  58
  59   it('Verify that the function is executed in a worker cluster', async () => {
  60     let result = await pool.execute({
  61       function: WorkerFunctions.fibonacci
  62     })
  63     expect(result).toBe(false)
  64     result = await pool.execute({
  65       function: WorkerFunctions.factorial
  66     })
  67     expect(result).toBe(false)
  68   })
  69
  70   it('Verify that is possible to invoke the execute method without input', async () => {
  71     const result = await pool.execute()
  72     expect(result).toBe(false)
  73   })
  74
  75   it('Verify that busy event is emitted', async () => {
  76     const promises = []
  77     let poolBusy = 0
  78     pool.emitter.on('busy', () => poolBusy++)
  79     for (let i = 0; i < numberOfWorkers * 2; i++) {
  80       promises.push(pool.execute())
  81     }
  82     // The `busy` event is triggered when the number of submitted tasks at once reach the number of fixed pool workers.
  83     // So in total numberOfWorkers + 1 times for a loop submitting up to numberOfWorkers * 2 tasks to the fixed pool.
  84     expect(poolBusy).toBe(numberOfWorkers + 1)
  85   })
  86
  87   it('Verify that is possible to have a worker that return undefined', async () => {
  88     const result = await emptyPool.execute()
  89     expect(result).toBeUndefined()
  90   })
  91
  92   it('Verify that data are sent to the worker correctly', async () => {
  93     const data = { f: 10 }
  94     const result = await echoPool.execute(data)
  95     expect(result).toEqual(data)
  96   })
  97
  98   it('Verify that error handling is working properly:sync', async () => {
  99     const data = { f: 10 }
 100     let inError
 101     try {
 102       await errorPool.execute(data)
 103     } catch (e) {
 104       inError = e
 105     }
 106     expect(inError).toBeDefined()
 107     expect(typeof inError === 'string').toBe(true)
 108     expect(inError).toBe('Error Message from ClusterWorker')
 109   })
 110
 111   it('Verify that error handling is working properly:async', async () => {
 112     const data = { f: 10 }
 113     let inError
 114     try {
 115       await asyncErrorPool.execute(data)
 116     } catch (e) {
 117       inError = e
 118     }
 119     expect(inError).toBeDefined()
 120     expect(typeof inError === 'string').toBe(true)
 121     expect(inError).toBe('Error Message from ClusterWorker:async')
 122   })
 123
 124   it('Verify that async function is working properly', async () => {
 125     const data = { f: 10 }
 126     const startTime = new Date().getTime()
 127     const result = await asyncPool.execute(data)
 128     const usedTime = new Date().getTime() - startTime
 129     expect(result).toEqual(data)
 130     expect(usedTime).toBeGreaterThanOrEqual(2000)
 131   })
 132
 133   it('Shutdown test', async () => {
 134     const exitPromise = TestUtils.waitExits(pool, numberOfWorkers)
 135     await pool.destroy()
 136     const numberOfExitEvents = await exitPromise
 137     expect(numberOfExitEvents).toBe(numberOfWorkers)
 138   })
 139
 140   it('Should work even without opts in input', async () => {
 141     const pool1 = new FixedClusterPool(
 142       1,
 143       './tests/worker-files/cluster/testWorker.js'
 144     )
 145     const res = await pool1.execute()
 146     expect(res).toBe(false)
 147     // We need to clean up the resources after our test
 148     await pool1.destroy()
 149   })
 150
 151   it('Verify that a pool with zero worker fails', async () => {
 152     expect(
 153       () =>
 154         new FixedClusterPool(0, './tests/worker-files/cluster/testWorker.js')
 155     ).toThrowError(new Error('Cannot instantiate a fixed pool with no worker'))
 156   })
 157 })