hasql-queue: A PostgreSQL backed queue

[ bsd3, library, program, web ] [ Propose Tags ]

A PostgreSQL backed queue. Please see README.md

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Versions [faq] 1.0.1,,,,
Change log CHANGELOG.md
Dependencies aeson, async, base (>=4.7 && <5), base64-bytestring, bytestring, cryptohash-sha1, exceptions, hasql, hasql-queue, here, monad-control, postgresql-libpq, postgresql-libpq-notify (>=, random, resource-pool, stm, text, time, tmp-postgres, transformers [details]
License BSD-3-Clause
Copyright 2020 Jonathan Fischoff
Author Jonathan Fischoff
Maintainer jonathangfischoff@gmail.com
Category Web
Home page https://github.com/jfischoff/hasql-queue#readme
Bug tracker https://github.com/jfischoff/hasql-queue/issues
Source repo head: git clone https://github.com/jfischoff/hasql-queue
Uploaded by JonathanFischoff at 2020-07-06T23:27:11Z
Distributions NixOS:
Executables hasql-queue-tmp-db, benchmark
Downloads 229 total (30 in the last 30 days)
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Status Hackage Matrix CI
Docs available [build log]
Last success reported on 2020-07-06 [all 1 reports]


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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