tests/pools/cluster/fixed.test.js

   1 const { expect } = require('expect')
   2 const { FixedClusterPool, PoolEvents } = 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('Verify that the function is executed in a worker cluster', async () => {
  53     let result = await pool.execute({
  54       function: WorkerFunctions.fibonacci
  55     })
  56     expect(result).toBe(false)
  57     result = await pool.execute({
  58       function: WorkerFunctions.factorial
  59     })
  60     expect(result).toBe(false)
  61   })
  62
  63   it('Verify that is possible to invoke the execute method without input', async () => {
  64     const result = await pool.execute()
  65     expect(result).toBe(false)
  66   })
  67
  68   it("Verify that 'busy' event is emitted", async () => {
  69     let poolBusy = 0
  70     pool.emitter.on(PoolEvents.busy, () => ++poolBusy)
  71     for (let i = 0; i < numberOfWorkers * 2; i++) {
  72       pool.execute()
  73     }
  74     // The `busy` event is triggered when the number of submitted tasks at once reach the number of fixed pool workers.
  75     // So in total numberOfWorkers + 1 times for a loop submitting up to numberOfWorkers * 2 tasks to the fixed pool.
  76     expect(poolBusy).toBe(numberOfWorkers + 1)
  77   })
  78
  79   it('Verify that is possible to have a worker that return undefined', async () => {
  80     const result = await emptyPool.execute()
  81     expect(result).toBeUndefined()
  82   })
  83
  84   it('Verify that data are sent to the worker correctly', async () => {
  85     const data = { f: 10 }
  86     const result = await echoPool.execute(data)
  87     expect(result).toStrictEqual(data)
  88   })
  89
  90   it('Verify that error handling is working properly:sync', async () => {
  91     const data = { f: 10 }
  92     let inError
  93     try {
  94       await errorPool.execute(data)
  95     } catch (e) {
  96       inError = e
  97     }
  98     expect(inError).toBeDefined()
  99     expect(typeof inError === 'string').toBe(true)
 100     expect(inError).toBe('Error Message from ClusterWorker')
 101   })
 102
 103   it('Verify that error handling is working properly:async', async () => {
 104     const data = { f: 10 }
 105     let inError
 106     try {
 107       await asyncErrorPool.execute(data)
 108     } catch (e) {
 109       inError = e
 110     }
 111     expect(inError).toBeDefined()
 112     expect(typeof inError === 'string').toBe(true)
 113     expect(inError).toBe('Error Message from ClusterWorker:async')
 114   })
 115
 116   it('Verify that async function is working properly', async () => {
 117     const data = { f: 10 }
 118     const startTime = Date.now()
 119     const result = await asyncPool.execute(data)
 120     const usedTime = Date.now() - startTime
 121     expect(result).toStrictEqual(data)
 122     expect(usedTime).toBeGreaterThanOrEqual(2000)
 123   })
 124
 125   it('Shutdown test', async () => {
 126     const exitPromise = TestUtils.waitExits(pool, numberOfWorkers)
 127     await pool.destroy()
 128     const numberOfExitEvents = await exitPromise
 129     expect(numberOfExitEvents).toBe(numberOfWorkers)
 130   })
 131
 132   it('Verify that cluster pool options are checked', async () => {
 133     const workerFilePath = './tests/worker-files/cluster/testWorker.js'
 134     let pool1 = new FixedClusterPool(numberOfWorkers, workerFilePath)
 135     expect(pool1.opts.env).toBeUndefined()
 136     expect(pool1.opts.settings).toBeUndefined()
 137     await pool1.destroy()
 138     pool1 = new FixedClusterPool(numberOfWorkers, workerFilePath, {
 139       env: { TEST: 'test' },
 140       settings: { args: ['--use', 'http'], silent: true }
 141     })
 142     expect(pool1.opts.env).toStrictEqual({ TEST: 'test' })
 143     expect(pool1.opts.settings).toStrictEqual({
 144       args: ['--use', 'http'],
 145       silent: true
 146     })
 147     expect({ ...pool1.opts.settings, exec: workerFilePath }).toStrictEqual({
 148       args: ['--use', 'http'],
 149       silent: true,
 150       exec: workerFilePath
 151     })
 152     await pool1.destroy()
 153   })
 154
 155   it('Should work even without opts in input', async () => {
 156     const pool1 = new FixedClusterPool(
 157       numberOfWorkers,
 158       './tests/worker-files/cluster/testWorker.js'
 159     )
 160     const res = await pool1.execute()
 161     expect(res).toBe(false)
 162     // We need to clean up the resources after our test
 163     await pool1.destroy()
 164   })
 165
 166   it('Verify that a pool with zero worker fails', async () => {
 167     expect(
 168       () =>
 169         new FixedClusterPool(0, './tests/worker-files/cluster/testWorker.js')
 170     ).toThrowError(new Error('Cannot instantiate a fixed pool with no worker'))
 171   })
 172 })