tests/pools/cluster/dynamic.test.js

   1 const { expect } = require('expect')
   2 const { DynamicClusterPool, PoolEvents } = require('../../../lib')
   3 const { TaskFunctions } = require('../../test-types')
   4 const { sleep, waitWorkerEvents } = require('../../test-utils')
   5
   6 describe('Dynamic cluster pool test suite', () => {
   7   const min = 1
   8   const max = 3
   9   const pool = new DynamicClusterPool(
  10     min,
  11     max,
  12     './tests/worker-files/cluster/testWorker.js',
  13     {
  14       errorHandler: (e) => console.error(e)
  15     }
  16   )
  17
  18   it('Verify that the function is executed in a worker cluster', async () => {
  19     let result = await pool.execute({
  20       function: TaskFunctions.fibonacci
  21     })
  22     expect(result).toBe(75025)
  23     result = await pool.execute({
  24       function: TaskFunctions.factorial
  25     })
  26     expect(result).toBe(9.33262154439441e157)
  27   })
  28
  29   it('Verify that new workers are created when required, max size is not exceeded and that after a while new workers will die', async () => {
  30     let poolBusy = 0
  31     pool.emitter.on(PoolEvents.busy, () => ++poolBusy)
  32     for (let i = 0; i < max * 2; i++) {
  33       pool.execute()
  34     }
  35     expect(pool.workerNodes.length).toBeLessThanOrEqual(max)
  36     expect(pool.workerNodes.length).toBeGreaterThan(min)
  37     expect(poolBusy).toBe(1)
  38     const numberOfExitEvents = await waitWorkerEvents(pool, 'exit', max - min)
  39     expect(numberOfExitEvents).toBe(max - min)
  40   })
  41
  42   it('Verify scale worker up and down is working', async () => {
  43     expect(pool.workerNodes.length).toBe(min)
  44     for (let i = 0; i < max * 2; i++) {
  45       pool.execute()
  46     }
  47     expect(pool.workerNodes.length).toBeGreaterThan(min)
  48     await waitWorkerEvents(pool, 'exit', max - min)
  49     expect(pool.workerNodes.length).toBe(min)
  50     for (let i = 0; i < max * 2; i++) {
  51       pool.execute()
  52     }
  53     expect(pool.workerNodes.length).toBeGreaterThan(min)
  54     await waitWorkerEvents(pool, 'exit', max - min)
  55     expect(pool.workerNodes.length).toBe(min)
  56   })
  57
  58   it('Shutdown test', async () => {
  59     const exitPromise = waitWorkerEvents(pool, 'exit', min)
  60     let poolDestroy = 0
  61     pool.emitter.on(PoolEvents.destroy, () => ++poolDestroy)
  62     await pool.destroy()
  63     const numberOfExitEvents = await exitPromise
  64     expect(numberOfExitEvents).toBe(min)
  65     expect(poolDestroy).toBe(1)
  66   })
  67
  68   it('Validation of inputs test', () => {
  69     expect(() => new DynamicClusterPool(min)).toThrowError(
  70       'Please specify a file with a worker implementation'
  71     )
  72   })
  73
  74   it('Should work even without opts in input', async () => {
  75     const pool1 = new DynamicClusterPool(
  76       min,
  77       max,
  78       './tests/worker-files/cluster/testWorker.js'
  79     )
  80     const result = await pool1.execute()
  81     expect(result).toStrictEqual({ ok: 1 })
  82     // We need to clean up the resources after our test
  83     await pool1.destroy()
  84   })
  85
  86   it('Verify scale processes up and down is working when long executing task is used:hard', async () => {
  87     const longRunningPool = new DynamicClusterPool(
  88       min,
  89       max,
  90       './tests/worker-files/cluster/longRunningWorkerHardBehavior.js',
  91       {
  92         errorHandler: (e) => console.error(e),
  93         onlineHandler: () => console.info('long executing worker is online'),
  94         exitHandler: () => console.info('long executing worker exited')
  95       }
  96     )
  97     expect(longRunningPool.workerNodes.length).toBe(min)
  98     for (let i = 0; i < max * 2; i++) {
  99       longRunningPool.execute()
 100     }
 101     expect(longRunningPool.workerNodes.length).toBe(max)
 102     await waitWorkerEvents(longRunningPool, 'exit', max - min)
 103     expect(longRunningPool.workerNodes.length).toBe(min)
 104     expect(
 105       longRunningPool.workerChoiceStrategyContext.workerChoiceStrategies.get(
 106         longRunningPool.workerChoiceStrategyContext.workerChoiceStrategy
 107       ).nextWorkerNodeKey
 108     ).toBeLessThan(longRunningPool.workerNodes.length)
 109     // We need to clean up the resources after our test
 110     await longRunningPool.destroy()
 111   })
 112
 113   it('Verify scale processes up and down is working when long executing task is used:soft', async () => {
 114     const longRunningPool = new DynamicClusterPool(
 115       min,
 116       max,
 117       './tests/worker-files/cluster/longRunningWorkerSoftBehavior.js',
 118       {
 119         errorHandler: (e) => console.error(e),
 120         onlineHandler: () => console.info('long executing worker is online'),
 121         exitHandler: () => console.info('long executing worker exited')
 122       }
 123     )
 124     expect(longRunningPool.workerNodes.length).toBe(min)
 125     for (let i = 0; i < max * 2; i++) {
 126       longRunningPool.execute()
 127     }
 128     expect(longRunningPool.workerNodes.length).toBe(max)
 129     await sleep(1000)
 130     // Here we expect the workerNodes to be at the max size since the task is still executing
 131     expect(longRunningPool.workerNodes.length).toBe(max)
 132     // We need to clean up the resources after our test
 133     await longRunningPool.destroy()
 134   })
 135
 136   it('Verify that a pool with zero worker can be instantiated', async () => {
 137     const pool = new DynamicClusterPool(
 138       0,
 139       max,
 140       './tests/worker-files/cluster/testWorker.js'
 141     )
 142     expect(pool).toBeInstanceOf(DynamicClusterPool)
 143     // We need to clean up the resources after our test
 144     await pool.destroy()
 145   })
 146 })