159 lines
3.4 KiB
Go
159 lines
3.4 KiB
Go
package flightcontrol
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import (
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"sync/atomic"
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"testing"
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"time"
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"github.com/pkg/errors"
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"github.com/stretchr/testify/assert"
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"golang.org/x/net/context"
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"golang.org/x/sync/errgroup"
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)
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func TestNoCancel(t *testing.T) {
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g := &Group{}
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eg, ctx := errgroup.WithContext(context.Background())
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var r1, r2 string
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var counter int64
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f := testFunc(100*time.Millisecond, "bar", &counter)
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eg.Go(func() error {
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ret1, err, _ := g.Do(ctx, "foo", f)
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if err != nil {
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return err
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}
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r1 = ret1.(string)
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return nil
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})
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eg.Go(func() error {
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ret2, err, _ := g.Do(ctx, "foo", f)
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if err != nil {
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return err
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}
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r2 = ret2.(string)
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return nil
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})
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err := eg.Wait()
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assert.NoError(t, err)
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assert.Equal(t, "bar", r1)
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assert.Equal(t, "bar", r2)
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assert.Equal(t, counter, int64(1))
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}
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func TestCancelOne(t *testing.T) {
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g := &Group{}
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eg, ctx := errgroup.WithContext(context.Background())
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var r1, r2 string
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var counter int64
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f := testFunc(100*time.Millisecond, "bar", &counter)
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ctx2, cancel := context.WithCancel(ctx)
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eg.Go(func() error {
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ret1, err, _ := g.Do(ctx2, "foo", f)
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assert.Error(t, err)
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assert.Equal(t, errors.Cause(err), context.Canceled)
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if err == nil {
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r1 = ret1.(string)
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}
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return nil
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})
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eg.Go(func() error {
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ret2, err, _ := g.Do(ctx, "foo", f)
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if err != nil {
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return err
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}
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r2 = ret2.(string)
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return nil
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})
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eg.Go(func() error {
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select {
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case <-ctx.Done():
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return ctx.Err()
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case <-time.After(30 * time.Millisecond):
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cancel()
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return nil
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}
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})
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err := eg.Wait()
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assert.NoError(t, err)
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assert.Equal(t, "", r1)
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assert.Equal(t, "bar", r2)
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assert.Equal(t, counter, int64(1))
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}
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func TestCancelBoth(t *testing.T) {
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g := &Group{}
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eg, ctx := errgroup.WithContext(context.Background())
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var r1, r2 string
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var counter int64
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f := testFunc(100*time.Millisecond, "bar", &counter)
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ctx2, cancel2 := context.WithCancel(ctx)
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ctx3, cancel3 := context.WithCancel(ctx)
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eg.Go(func() error {
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ret1, err, _ := g.Do(ctx2, "foo", f)
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assert.Error(t, err)
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assert.Equal(t, errors.Cause(err), context.Canceled)
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if err == nil {
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r1 = ret1.(string)
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}
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return nil
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})
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eg.Go(func() error {
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ret2, err, _ := g.Do(ctx3, "foo", f)
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assert.Error(t, err)
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assert.Equal(t, errors.Cause(err), context.Canceled)
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if err == nil {
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r2 = ret2.(string)
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}
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return nil
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})
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eg.Go(func() error {
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select {
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case <-ctx.Done():
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return ctx.Err()
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case <-time.After(20 * time.Millisecond):
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cancel2()
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return nil
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}
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})
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eg.Go(func() error {
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select {
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case <-ctx.Done():
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return ctx.Err()
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case <-time.After(50 * time.Millisecond):
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cancel3()
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return nil
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}
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})
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err := eg.Wait()
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assert.NoError(t, err)
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assert.Equal(t, "", r1)
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assert.Equal(t, "", r2)
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assert.Equal(t, counter, int64(1))
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ret1, err, _ := g.Do(context.TODO(), "foo", f)
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assert.NoError(t, err)
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assert.Equal(t, ret1, "bar")
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f2 := testFunc(100*time.Millisecond, "baz", &counter)
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ret1, err, _ = g.Do(context.TODO(), "foo", f2)
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assert.NoError(t, err)
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assert.Equal(t, ret1, "baz")
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ret1, err, _ = g.Do(context.TODO(), "abc", f)
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assert.NoError(t, err)
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assert.Equal(t, ret1, "bar")
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assert.Equal(t, counter, int64(4))
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}
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func testFunc(wait time.Duration, ret string, counter *int64) func(ctx context.Context) (interface{}, error) {
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return func(ctx context.Context) (interface{}, error) {
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atomic.AddInt64(counter, 1)
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select {
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case <-ctx.Done():
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return nil, ctx.Err()
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case <-time.After(wait):
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return ret, nil
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}
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}
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}
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