使用AWS SNS在重试后将消息从源队列移至DLQ的指南

在这个例子中，AWS SNS的通知将被转发到AWS SQS并从那里进行处理。我们将在3次重试后将消息从AWS SQS源队列转移到DLQ。如果消息由于某种原因没有被处理，就会发生重试。每次尝试之间，消息将每隔30秒可见一次。

设置

// Create SQS queue
$ aws --profile localstack --endpoint-url http://localhost:4566 sqs create-queue \
    --queue-name test-queue.dlq

// Create SQS DLQ queue
$ aws --profile localstack --endpoint-url http://localhost:4566 sqs create-queue \
    --queue-name test-queue \
    --attributes '{"RedrivePolicy":"{\"deadLetterTargetArn\":\"arn:aws:sqs:eu-west-1:000000000000:test-queue.dlq\",\"maxReceiveCount\":\"3\"}"}'

// Create SNS topic
$ aws --profile localstack --endpoint-url http://localhost:4566 sns create-topic \
    --name test-topic

// Subscribe SQS queue to SNS topic
$ aws --profile localstack --endpoint-url http://localhost:4566 sns subscribe \
    --protocol sqs \
    --topic-arn arn:aws:sns:eu-west-1:000000000000:test-topic \
    --notification-endpoint arn:aws:sqs:eu-west-1:000000000000:test-queue

测试

$ aws --profile localstack --endpoint-url http://localhost:4566 sns publish \
    --topic-arn arn:aws:sns:eu-west-1:000000000000:test-topic \
    --message 'Hello'

尝试消耗消息3次：

$ aws --profile localstack --endpoint-url http://localhost:4566 sqs receive-message \
    --queue-url http://localhost:4566/000000000000/test-queue \
    --attribute-names All --message-attribute-names All

$ aws --profile localstack --endpoint-url http://localhost:4566 sqs receive-message \
    --queue-url http://localhost:4566/000000000000/test-queue \
    --attribute-names All --message-attribute-names All

$ aws --profile localstack --endpoint-url http://localhost:4566 sqs receive-message \
    --queue-url http://localhost:4566/000000000000/test-queue \
    --attribute-names All --message-attribute-names All

消息现在应该在DLQ中：

$ aws --profile localstack --endpoint-url http://localhost:4566 sqs receive-message \
    --queue-url http://localhost:4566/000000000000/test-queue.dlq \
    --attribute-names All --message-attribute-names All