👀 Views: 8665 💬 Answers: 1 📅 Created: 2025-07-02

google-cloud-platform pubsub go context acknowledgment Go

I'm stuck trying to I'm currently facing an issue where messages from Cloud Pub/Sub are not being acknowledged correctly in my Go application. I'm using the `cloud.google.com/go/pubsub` library version `1.16.0` and have implemented a subscriber that processes messages with a context timeout. Here's the code snippet for my subscriber: ```go package main import ( "context" "fmt" "log" "time" "cloud.google.com/go/pubsub" ) func main() { ctx := context.Background() client, err := pubsub.NewClient(ctx, "my-project-id") if err != nil { log.Fatalf("failed to create pubsub client: %v", err) } sub := client.Subscription("my-subscription") err = sub.Receive(ctx, func(ctx context.Context, msg *pubsub.Message) { defer msg.Ack() // Acknowledge the message right away fmt.Printf("Received message: %s ", msg.Data) // Simulate processing time time.Sleep(10 * time.Second) // This exceeds the 5 second timeout }) if err != nil { log.Fatalf("failed to receive messages: %v", err) } } ``` The issue I'm encountering is that when the processing time of the message exceeds the context timeout (which I set to 5 seconds), the message is not acknowledged, and I receive a dead letter notification stating that the message has been re-delivered multiple times. I expected the message to be acknowledged even if it takes longer to process because I’m calling `msg.Ack()` right after printing the message data. I've tried increasing the context timeout and also wrapping the `time.Sleep` call in a separate goroutine to see if that would help, but it didn't resolve the issue. Here is how I attempted to modify the context: ```go ctx, cancel := context.WithTimeout(context.Background(), 30 * time.Second) defer cancel() ``` After making this change, I still see messages being re-delivered after the timeout. Is there a known issue with message acknowledgment timing, or am I missing something in the implementation? How can I ensure messages are acknowledged properly even if processing time varies? What would be the recommended way to handle this?