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160 lines
4.4 KiB
160 lines
4.4 KiB
package async
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import (
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"errors"
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"fmt"
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"sync/atomic"
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"testing"
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"time"
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"github.com/stretchr/testify/assert"
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)
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func TestParallel(t *testing.T) {
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// Create tasks.
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var counter = new(int32)
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var tasks = make([]Task, 100*1000)
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for i := 0; i < len(tasks); i++ {
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tasks[i] = func(i int) (res interface{}, abort bool, err error) {
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atomic.AddInt32(counter, 1)
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return -1 * i, false, nil
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}
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}
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// Run in parallel.
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var trs, ok = Parallel(tasks...)
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assert.True(t, ok)
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// Verify.
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assert.Equal(t, int(*counter), len(tasks), "Each task should have incremented the counter already")
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var failedTasks int
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for i := 0; i < len(tasks); i++ {
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taskResult, ok := trs.LatestResult(i)
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switch {
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case !ok:
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assert.Fail(t, "Task #%v did not complete.", i)
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failedTasks++
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case taskResult.Error != nil:
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assert.Fail(t, "Task should not have errored but got %v", taskResult.Error)
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failedTasks++
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case !assert.Equal(t, -1*i, taskResult.Value.(int)):
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assert.Fail(t, "Task should have returned %v but got %v", -1*i, taskResult.Value.(int))
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failedTasks++
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}
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// else {
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// Good!
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// }
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}
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assert.Equal(t, failedTasks, 0, "No task should have failed")
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assert.Nil(t, trs.FirstError(), "There should be no errors")
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assert.Equal(t, 0, trs.FirstValue(), "First value should be 0")
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}
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func TestParallelAbort(t *testing.T) {
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var flow1 = make(chan struct{}, 1)
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var flow2 = make(chan struct{}, 1)
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var flow3 = make(chan struct{}, 1) // Cap must be > 0 to prevent blocking.
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var flow4 = make(chan struct{}, 1)
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// Create tasks.
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var tasks = []Task{
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func(i int) (res interface{}, abort bool, err error) {
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assert.Equal(t, i, 0)
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flow1 <- struct{}{}
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return 0, false, nil
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},
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func(i int) (res interface{}, abort bool, err error) {
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assert.Equal(t, i, 1)
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flow2 <- <-flow1
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return 1, false, errors.New("some error")
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},
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func(i int) (res interface{}, abort bool, err error) {
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assert.Equal(t, i, 2)
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flow3 <- <-flow2
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return 2, true, nil
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},
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func(i int) (res interface{}, abort bool, err error) {
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assert.Equal(t, i, 3)
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<-flow4
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return 3, false, nil
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},
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}
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// Run in parallel.
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var taskResultSet, ok = Parallel(tasks...)
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assert.False(t, ok, "ok should be false since we aborted task #2.")
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// Verify task #3.
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// Initially taskResultSet.chz[3] sends nothing since flow4 didn't send.
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waitTimeout(t, taskResultSet.chz[3], "Task #3")
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// Now let the last task (#3) complete after abort.
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flow4 <- <-flow3
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// Wait until all tasks have returned or panic'd.
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taskResultSet.Wait()
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// Verify task #0, #1, #2.
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checkResult(t, taskResultSet, 0, 0, nil, nil)
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checkResult(t, taskResultSet, 1, 1, errors.New("some error"), nil)
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checkResult(t, taskResultSet, 2, 2, nil, nil)
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checkResult(t, taskResultSet, 3, 3, nil, nil)
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}
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func TestParallelRecover(t *testing.T) {
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// Create tasks.
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var tasks = []Task{
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func(i int) (res interface{}, abort bool, err error) {
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return 0, false, nil
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},
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func(i int) (res interface{}, abort bool, err error) {
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return 1, false, errors.New("some error")
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},
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func(i int) (res interface{}, abort bool, err error) {
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panic(2)
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},
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}
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// Run in parallel.
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var taskResultSet, ok = Parallel(tasks...)
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assert.False(t, ok, "ok should be false since we panic'd in task #2.")
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// Verify task #0, #1, #2.
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checkResult(t, taskResultSet, 0, 0, nil, nil)
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checkResult(t, taskResultSet, 1, 1, errors.New("some error"), nil)
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checkResult(t, taskResultSet, 2, nil, nil, fmt.Errorf("panic in task %v", 2).Error())
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}
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// Wait for result
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func checkResult(t *testing.T, taskResultSet *TaskResultSet, index int,
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val interface{}, err error, pnk interface{}) {
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taskResult, ok := taskResultSet.LatestResult(index)
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taskName := fmt.Sprintf("Task #%v", index)
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assert.True(t, ok, "TaskResultCh unexpectedly closed for %v", taskName)
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assert.Equal(t, val, taskResult.Value, taskName)
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switch {
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case err != nil:
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assert.Equal(t, err.Error(), taskResult.Error.Error(), taskName)
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case pnk != nil:
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assert.Equal(t, pnk, taskResult.Error.Error(), taskName)
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default:
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assert.Nil(t, taskResult.Error, taskName)
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}
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}
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// Wait for timeout (no result)
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func waitTimeout(t *testing.T, taskResultCh TaskResultCh, taskName string) {
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select {
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case _, ok := <-taskResultCh:
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if !ok {
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assert.Fail(t, "TaskResultCh unexpectedly closed (%v)", taskName)
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} else {
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assert.Fail(t, "TaskResultCh unexpectedly returned for %v", taskName)
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}
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case <-time.After(1 * time.Second): // TODO use deterministic time?
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// Good!
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}
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}
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