@defra-fish/sqs-receiver-service v1.44.0
sqs-receiver-service
This service is configured to poll a set of SQS queues and on receipt of a message from the queue it will notify a subscribing service.
If the response from the subscriber is successful the message will be removed from the queue. If not the message will become visible again after the visibility timeout and maybe reprocessed subject to the SQS re-drive policy.
To control via pm2
pm2 [start|restart|stop|delete] ecosystem.config.js
The ecosystem.config.js
file contains the set of receiver services to run. An example entry is shown:
- script: ./index.js
name: 'Sales Queue'
env:
RECEIVER_PREFIX: SALES_QUEUE
output: ./logs/sales-queue.out
error: ./logs/sales-queue.err
autorestart: false
There is a required set of environment variables which must be set for each receiver. For example:
SALES_QUEUE_URL=http://0.0.0.0:9325/queue/SalesQueue.fifo
SALES_QUEUE_POLLING_RATE_MS=10000
SALES_QUEUE_VISIBILITY_TIMEOUT_MS=120000
SALES_QUEUE_WAIT_TIME_MS=2000
SALES_QUEUE_NO_DELAY_THRESHOLD=4
SALES_QUEUE_SUBSCRIBER=http://localhost:4000
SALES_QUEUE_SUBSCRIBER_TIMEOUT_MS=5000
- URL - The SQS queue location
- POLLING_RATE_MS - The duration of the long poll
- VISIBILITY_TIMEOUT_MS - The length of time the message is made invisible to other processes
- WAIT_TIME_MS - The delay between polling events
- NO_DELAY_THRESHOLD - The number of messages above which the delay is not observed
- SUBSCRIBER - The location of the subscriber. The message group id is appended
Debug
The service uses the debug package use set DEBUG=[receiver|queue-stats|process-message|read-queue|delete-messages]
Failures
The service will fail early where a general error reading an SQS queue is encountered such as ECONNREFUSED
In the case of all http errors reading SQS queues the service will log the error continue. See: https://docs.aws.amazon.com/AWSSimpleQueueService/latest/APIReference/CommonErrors.html
In the case of all errors encountered in the subscriber process queues the service will log the error continue
Only in the cases where the subscriber return an http success status will the message be removed from the SQS queue
A development environment can be set up as follows
SALES_QUEUE_URL=http://0.0.0.0:9325/queue/SalesQueue.fifo
SALES_QUEUE_POLLING_RATE_MS=5000
SALES_QUEUE_VISIBILITY_TIMEOUT_MS=15000
SALES_QUEUE_WAIT_TIME_MS=5000
SALES_QUEUE_NO_DELAY_THRESHOLD=4
SALES_QUEUE_SUBSCRIBER=http://localhost:4000
SALES_QUEUE_SUBSCRIBER_TIMEOUT_MS=5000
SALES_DEAD_LETTER_QUEUE_URL=http://0.0.0.0:9325/queue/SalesDeadLetterQueue.fifo
SALES_DEAD_LETTER_QUEUE_POLLING_RATE_MS=5000
SALES_DEAD_LETTER_QUEUE_VISIBILITY_TIMEOUT_MS=15000
SALES_DEAD_LETTER_QUEUE_WAIT_TIME_MS=2000
SALES_DEAD_LETTER_QUEUE_NO_DELAY_THRESHOLD=4
SALES_DEAD_LETTER_QUEUE_SUBSCRIBER=http://localhost:4000/error
SALES_DEAD_LETTER_QUEUE_SUBSCRIBER_TIMEOUT_MS=5000
AWS_ACCESS_KEY_ID=
AWS_SECRET_ACCESS_KEY=
AWS_REGION=eu-west-1
DEBUG=queue-stats
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