hasql-queue

A PostgreSQL backed queue

https://github.com/jfischoff/hasql-queue#readme

Version on this page:1.2.0.1
LTS Haskell 21.25:1.2.0.2
Stackage Nightly 2023-06-21:1.2.0.2
Latest on Hackage:1.2.0.2

See all snapshots hasql-queue appears in

BSD-3-Clause licensed by Jonathan Fischoff
Maintained by [email protected]
This version can be pinned in stack with:hasql-queue-1.2.0.1@sha256:e3ac37263321928d341d1f7b042548b171ff8d5dc9076effa7871b7d5d1e6d55,4531

Module documentation for 1.2.0.1

Used by 1 package in nightly-2020-07-06(full list with versions):
hasql-queue

Travis CI Status

hasql-queue

This module utilizes PostgreSQL to implement a durable queue for efficently processing payloads.

Typically a producer would enqueue a new payload as part of larger database transaction

createAccount userRecord = transaction Serializable Write $ do
  createUser userRecord
  enqueue "queue_channel" emailEncoder [makeVerificationEmail userRecord]

In another thread or process the consumer would drain the queue.

  -- Wait for a single new record and try to send the email 5 times for giving
  -- up and marking the payload as failed.
  forever $ withDequeue "queue_channel" conn emailDecoder 5 1 $
    mapM_ sendEmail

Changes

Changelog for hasql-queue

  • 1.2.0.1
    • Update README.md

-1.2.0.0

  • Escape notification channel #100

  • Remove dequeued count from benchmarks #99

  • Document new api #98

  • Create teardown for migration #96

  • Extend API to use schemas #95

  • Add delete to the AtLeastOnce APIs #92

  • Change failed function to failures and return all PayloadIds #91

  • Reorg API #89

  • Use a compound index to make the partial index work #86

  • Specialize single element dequeue #84

  • Delete instead of changing the state to dequeued #82

  • 1.0.1.1

    • Fixed cabal meta data and copyright

  • 1.0.1

    • First release!