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
   6 describe('Fixed cluster pool test suite', () => {
   7   const numberOfWorkers = 6
   8   const pool = new FixedClusterPool(
   9     numberOfWorkers,
  10     './tests/worker-files/cluster/testWorker.js',
  11     {
  12       errorHandler: e => console.error(e)
  13     }
  14   )
  15   const emptyPool = new FixedClusterPool(
  16     numberOfWorkers,
  17     './tests/worker-files/cluster/emptyWorker.js',
  18     { exitHandler: () => console.log('empty pool worker exited') }
  19   )
  20   const echoPool = new FixedClusterPool(
  21     numberOfWorkers,
  22     './tests/worker-files/cluster/echoWorker.js'
  23   )
  24   const errorPool = new FixedClusterPool(
  25     numberOfWorkers,
  26     './tests/worker-files/cluster/errorWorker.js',
  27     {
  28       errorHandler: e => console.error(e)
  29     }
  30   )
  31   const asyncErrorPool = new FixedClusterPool(
  32     numberOfWorkers,
  33     './tests/worker-files/cluster/asyncErrorWorker.js',
  34     {
  35       errorHandler: e => console.error(e)
  36     }
  37   )
  38   const asyncPool = new FixedClusterPool(
  39     numberOfWorkers,
  40     './tests/worker-files/cluster/asyncWorker.js'
  41   )
  42
  43   after('Destroy all pools', async () => {
  44     // We need to clean up the resources after our test
  45     await echoPool.destroy()
  46     await asyncPool.destroy()
  47     await errorPool.destroy()
  48     await asyncErrorPool.destroy()
  49     await emptyPool.destroy()
  50   })
  51
  52   it('Choose worker round robin test', async () => {
  53     const results = new Set()
  54     for (let i = 0; i < numberOfWorkers; i++) {
  55       results.add(pool.chooseWorker().id)
  56     }
  57     expect(results.size).toBe(numberOfWorkers)
  58   })
  59
  60   it('Verify that the function is executed in a worker cluster', async () => {
  61     let result = await pool.execute({
  62       function: WorkerFunctions.fibonacci
  63     })
  64     expect(result).toBe(false)
  65     result = await pool.execute({
  66       function: WorkerFunctions.factorial
  67     })
  68     expect(result).toBe(false)
  69   })
  70
  71   it('Verify that is possible to invoke the execute method without input', async () => {
  72     const result = await pool.execute()
  73     expect(result).toBe(false)
  74   })
  75
  76   it('Verify that busy event is emitted', async () => {
  77     let poolBusy = 0
  78     pool.emitter.on('busy', () => poolBusy++)
  79     for (let i = 0; i < numberOfWorkers * 2; i++) {
  80       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).toStrictEqual(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 = Date.now()
 127     const result = await asyncPool.execute(data)
 128     const usedTime = Date.now() - startTime
 129     expect(result).toStrictEqual(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('Verify that cluster pool options are checked', async () => {
 141     const workerFilePath = './tests/worker-files/cluster/testWorker.js'
 142     let pool1 = new FixedClusterPool(numberOfWorkers, workerFilePath)
 143     expect(pool1.opts.env).toBeUndefined()
 144     expect(pool1.opts.settings).toBeUndefined()
 145     await pool1.destroy()
 146     pool1 = new FixedClusterPool(numberOfWorkers, workerFilePath, {
 147       env: { TEST: 'test' },
 148       settings: { args: ['--use', 'http'], silent: true }
 149     })
 150     expect(pool1.opts.env).toStrictEqual({ TEST: 'test' })
 151     expect(pool1.opts.settings).toStrictEqual({
 152       args: ['--use', 'http'],
 153       silent: true
 154     })
 155     expect({ ...pool1.opts.settings, exec: workerFilePath }).toStrictEqual({
 156       args: ['--use', 'http'],
 157       silent: true,
 158       exec: workerFilePath
 159     })
 160     await pool1.destroy()
 161   })
 162
 163   it('Should work even without opts in input', async () => {
 164     const pool1 = new FixedClusterPool(
 165       numberOfWorkers,
 166       './tests/worker-files/cluster/testWorker.js'
 167     )
 168     const res = await pool1.execute()
 169     expect(res).toBe(false)
 170     // We need to clean up the resources after our test
 171     await pool1.destroy()
 172   })
 173
 174   it('Verify that a pool with zero worker fails', async () => {
 175     expect(
 176       () =>
 177         new FixedClusterPool(0, './tests/worker-files/cluster/testWorker.js')
 178     ).toThrowError(new Error('Cannot instantiate a fixed pool with no worker'))
 179   })
 180 })