add sending concurrently

Signed-off-by: myan <myan@redhat.com>

test/integration/mqtt_paho/concurrent_test.go

@@ -0,0 +1,88 @@
+/*
+Copyright 2024 The CloudEvents Authors
+SPDX-License-Identifier: Apache-2.0
+*/
+
+package mqtt_paho
+
+import (
+	"context"
+	"sync"
+	"testing"
+	"time"
+
+	"github.com/google/uuid"
+	"github.com/stretchr/testify/require"
+
+	cloudevents "github.com/cloudevents/sdk-go/v2"
+	cecontext "github.com/cloudevents/sdk-go/v2/context"
+)
+
+func TestConcurrentSendingEvent(t *testing.T) {
+	ctx, cancel := context.WithTimeout(context.Background(), 30*time.Second)
+	defer cancel()
+
+	topicName := "test-ce-client-" + uuid.New().String()
+
+	readyCh := make(chan bool)
+	defer close(readyCh)
+
+	senderNum := 10               // 10 gorutine to sending the events
+	eventNum := 1000              // each gorutine sender publishs 1,000 events
+	count := senderNum * eventNum //	sending 10,000 events concurrenly and verify all of them can be recieved
+
+	// start a receiver
+	c, err := cloudevents.NewClient(protocolFactory(ctx, t, topicName), cloudevents.WithUUIDs())
+	require.NoError(t, err)
+	go func() {
+		var mu sync.Mutex
+		err = c.StartReceiver(ctx, func(event cloudevents.Event) {
+			mu.Lock()
+			count--
+			mu.Unlock()
+
+			// all the events has been received
+			if count == 0 {
+				readyCh <- true
+			}
+		})
+		require.NoError(t, err)
+	}()
+	// wait for 5 seconds to ensure the receiver starts safely
+	time.Sleep(5 * time.Second)
+
+	// start a sender client to pulish events concurrently
+	client, err := cloudevents.NewClient(protocolFactory(ctx, t, topicName), cloudevents.WithUUIDs())
+	require.NoError(t, err)
+
+	evt := cloudevents.NewEvent()
+	evt.SetType("com.cloudevents.sample.sent")
+	evt.SetSource("concurrent-sender")
+	err = evt.SetData(cloudevents.ApplicationJSON, map[string]interface{}{"message": "Hello, World!"})
+	require.NoError(t, err)
+
+	for i := 0; i < senderNum; i++ {
+		go func() {
+			for j := 0; j < eventNum; j++ {
+				result := client.Send(
+					cecontext.WithTopic(ctx, topicName),
+					evt,
+				)
+				require.NoError(t, result)
+			}
+		}()
+	}
+
+	// wait until all the events are received
+	for {
+		select {
+		case <-ctx.Done():
+			require.Fail(t, "Test failed: timeout reached before events were received")
+			return
+		case <-readyCh:
+			cancel()
+			t.Logf("Test passed: events successfully received")
+			return
+		}
+	}
+}