feat: add func in channel.go

concurrency/channel.go

@@ -124,3 +124,36 @@ func (c *Channel) FanIn(ctx context.Context, channels ...<-chan any) <-chan any
 
 	return multiplexedStream
 }
+
+// Or merge one or more done channels into one done channel, which is closed when any done channel is closed
+func (c *Channel) Or(channels ...<-chan any) <-chan any {
+	switch len(channels) {
+	case 0:
+		return nil
+	case 1:
+		return channels[0]
+	}
+
+	orDone := make(chan any)
+
+	go func() {
+		defer close(orDone)
+
+		switch len(channels) {
+		case 2:
+			select {
+			case <-channels[0]:
+			case <-channels[1]:
+			}
+		default:
+			select {
+			case <-channels[0]:
+			case <-channels[1]:
+			case <-channels[2]:
+			case <-c.Or(append(channels[3:], orDone)...):
+			}
+		}
+	}()
+
+	return orDone
+}

concurrency/channel_test.go

@@ -3,6 +3,7 @@ package concurrency
 import (
 	"context"
 	"testing"
+	"time"
 
 	"github.com/duke-git/lancet/v2/internal"
 )
@@ -108,3 +109,25 @@ func TestFanIn(t *testing.T) {
 
 	assert.Equal(1, 1)
 }
+
+func TestOr(t *testing.T) {
+	assert := internal.NewAssert(t, "TestOr")
+
+	sig := func(after time.Duration) <-chan any {
+		c := make(chan interface{})
+		go func() {
+			defer close(c)
+			time.Sleep(after)
+		}()
+		return c
+	}
+
+	start := time.Now()
+
+	c := NewChannel()
+	<-c.Or(sig(2*time.Hour), sig(5*time.Minute), sig(1*time.Second), sig(1*time.Hour), sig(1*time.Minute))
+
+	t.Logf("done after %v", time.Since(start))
+
+	assert.Equal(1, 1)
+}