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|
package pool
import (
"errors"
"fmt"
"strconv"
"sync/atomic"
"testing"
"time"
"github.com/stretchr/testify/require"
)
func TestResultErrorGroup(t *testing.T) {
t.Parallel()
err1 := errors.New("err1")
err2 := errors.New("err2")
t.Run("panics on configuration after init", func(t *testing.T) {
t.Run("before wait", func(t *testing.T) {
t.Parallel()
g := NewWithResults[int]().WithErrors()
g.Go(func() (int, error) { return 0, nil })
require.Panics(t, func() { g.WithMaxGoroutines(10) })
})
t.Run("after wait", func(t *testing.T) {
t.Parallel()
g := NewWithResults[int]().WithErrors()
g.Go(func() (int, error) { return 0, nil })
_, _ = g.Wait()
require.Panics(t, func() { g.WithMaxGoroutines(10) })
})
})
t.Run("wait returns no error if no errors", func(t *testing.T) {
t.Parallel()
g := NewWithResults[int]().WithErrors()
g.Go(func() (int, error) { return 1, nil })
res, err := g.Wait()
require.NoError(t, err)
require.Equal(t, []int{1}, res)
})
t.Run("wait error if func returns error", func(t *testing.T) {
t.Parallel()
g := NewWithResults[int]().WithErrors()
g.Go(func() (int, error) { return 0, err1 })
res, err := g.Wait()
require.Len(t, res, 0) // errored value is ignored
require.ErrorIs(t, err, err1)
})
t.Run("WithCollectErrored", func(t *testing.T) {
t.Parallel()
g := NewWithResults[int]().WithErrors().WithCollectErrored()
g.Go(func() (int, error) { return 0, err1 })
res, err := g.Wait()
require.Len(t, res, 1) // errored value is collected
require.ErrorIs(t, err, err1)
})
t.Run("WithFirstError", func(t *testing.T) {
t.Parallel()
g := NewWithResults[int]().WithErrors().WithFirstError()
synchronizer := make(chan struct{})
g.Go(func() (int, error) {
<-synchronizer
// This test has an intrinsic race condition that can be reproduced
// by adding a `defer time.Sleep(time.Second)` before the `defer
// close(synchronizer)`. We cannot guarantee that the group processes
// the return value of the second goroutine before the first goroutine
// exits in response to synchronizer, so we add a sleep here to make
// this race condition vanishingly unlikely. Note that this is a race
// in the test, not in the library.
time.Sleep(100 * time.Millisecond)
return 0, err1
})
g.Go(func() (int, error) {
defer close(synchronizer)
return 0, err2
})
res, err := g.Wait()
require.Len(t, res, 0)
require.ErrorIs(t, err, err2)
require.NotErrorIs(t, err, err1)
})
t.Run("wait error is all returned errors", func(t *testing.T) {
t.Parallel()
g := NewWithResults[int]().WithErrors()
g.Go(func() (int, error) { return 0, err1 })
g.Go(func() (int, error) { return 0, nil })
g.Go(func() (int, error) { return 0, err2 })
res, err := g.Wait()
require.Len(t, res, 1)
require.ErrorIs(t, err, err1)
require.ErrorIs(t, err, err2)
})
t.Run("limit", func(t *testing.T) {
t.Parallel()
for _, maxConcurrency := range []int{1, 10, 100} {
t.Run(strconv.Itoa(maxConcurrency), func(t *testing.T) {
maxConcurrency := maxConcurrency // copy
t.Parallel()
g := NewWithResults[int]().WithErrors().WithMaxGoroutines(maxConcurrency)
var currentConcurrent atomic.Int64
taskCount := maxConcurrency * 10
for i := 0; i < taskCount; i++ {
g.Go(func() (int, error) {
cur := currentConcurrent.Add(1)
if cur > int64(maxConcurrency) {
return 0, fmt.Errorf("expected no more than %d concurrent goroutine", maxConcurrency)
}
time.Sleep(time.Millisecond)
currentConcurrent.Add(-1)
return 0, nil
})
}
res, err := g.Wait()
require.Len(t, res, taskCount)
require.NoError(t, err)
require.Equal(t, int64(0), currentConcurrent.Load())
})
}
})
}
|
