pubsub/v2/timeout_test.go

// Copyright 2025 Google LLC
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//      http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

package pubsub

import (
	"context"
	"log"
	"sync/atomic"
	"testing"
	"time"

	pb "cloud.google.com/go/pubsub/v2/apiv1/pubsubpb"
	"cloud.google.com/go/pubsub/v2/pstest"
	"google.golang.org/api/option"
	"google.golang.org/grpc"
	"google.golang.org/grpc/credentials/insecure"
)

// Using the fake PubSub server in the pstest package, verify that streaming
// pull resumes if the server stream times out.
func TestStreamTimeout(t *testing.T) {
	t.Parallel()
	log.SetFlags(log.Lmicroseconds)
	ctx := context.Background()
	srv := pstest.NewServer()
	defer srv.Close()

	srv.SetStreamTimeout(2 * time.Second)
	conn, err := grpc.Dial(srv.Addr, grpc.WithTransportCredentials(insecure.NewCredentials()))
	if err != nil {
		t.Fatal(err)
	}
	defer conn.Close()

	opts := withGRPCHeadersAssertion(t, option.WithGRPCConn(conn))
	client, err := NewClient(ctx, "P", opts...)
	if err != nil {
		t.Fatal(err)
	}
	defer client.Close()

	pbt, err := createTopicWithRetry(ctx, t, client, &pb.Topic{Name: "projects/P/topics/t"})
	if err != nil {
		t.Fatal(err)
	}
	pbs, err := createSubWithRetry(ctx, t, client, &pb.Subscription{
		Name: "projects/P/subscriptions/sub", Topic: pbt.Name},
	)
	if err != nil {
		t.Fatal(err)
	}
	publisher := client.Publisher(pbt.Name)
	sub := client.Subscriber(pbs.Name)
	const nPublish = 8
	rctx, cancel := context.WithTimeout(ctx, 30*time.Second)
	defer cancel()
	errc := make(chan error)
	var nSeen int64
	go func() {
		errc <- sub.Receive(rctx, func(ctx context.Context, m *Message) {
			m.Ack()
			n := atomic.AddInt64(&nSeen, 1)
			if n >= nPublish {
				cancel()
			}
		})
	}()

	for i := 0; i < nPublish; i++ {
		pr := publisher.Publish(ctx, &Message{Data: []byte("msg")})
		_, err := pr.Get(ctx)
		if err != nil {
			t.Fatal(err)
		}
		time.Sleep(250 * time.Millisecond)
	}

	if err := <-errc; err != nil {
		t.Fatal(err)
	}
	if err := deleteSub(ctx, client, sub.name); err != nil {
		t.Fatal(err)
	}
	n := atomic.LoadInt64(&nSeen)
	if n < nPublish {
		t.Errorf("got %d messages, want %d", n, nPublish)
	}
}