DEAD-LETTER EXCHANGE

and how to use it to implement delayed retry

the problem

• Dealing with shoddy WePay API
  • Timeout/Unknown error
  • Transaction may or may not be captured

solution1 - wishing

Solution 2

idempotency

being able to make the same call repeatedly

while producing the same result

Title Text

what it looks like

we still need to:

- retry

           - time delay

prior art:

repeater

• time.sleep
• block sparkplug process
• sparkplug forks more process

:(

dead-letter exchange

• AMQP protocol extension
• Set as a header when declaring the queue
• Can be used together with a dead-letter-routing-key

message-ttl

• AMQP extension
• How long should a message stay in the queue
• Can be applied to queue or message