postgresql-simple-queue: A PostgreSQL backed queue
This module utilize PostgreSQL to implement a durable queue for efficently processing arbitrary payloads which can be represented as JSON.
Typically a producer would enqueue a new payload as part of larger database transaction
createAccount userRecord = do
'runDBTSerializable' $ do
createUserDB userRecord
'enqueueDB' "queue_schema" $ makeVerificationEmail userRecordIn another thread or process, the consumer would drain the queue.
forever $ do
-- Attempt get a payload or block until one is available
payload <- lock "queue" conn
-- Perform application specifc parsing of the payload value
case fromJSON $ pValue payload of
Success x -> sendEmail x -- Perform application specific processing
Error err -> logErr err
-- Remove the payload from future processing
dequeue "queue" conn $ pId payload
To support multiple queues in the same database, the API expects a table name string
to determine which queue tables to use.
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| Versions [RSS] | 0.1.0.0, 0.1.0.1, 0.2.0.0, 0.2.1.0, 0.3.0.0, 0.4.0.0, 0.5.0.0, 0.5.0.1, 0.5.1.0, 0.5.1.1, 1.0.0, 1.0.1 |
|---|---|
| Dependencies | aeson, base (>=4.7 && <5), bytestring, exceptions, monad-control, pg-transact, postgresql-simple, random, stm, text, time, transformers [details] |
| License | BSD-3-Clause |
| Copyright | 2017 Jonathan Fischoff |
| Author | Jonathan Fischoff |
| Maintainer | jonathangfischoff@gmail.com |
| Category | Web |
| Home page | https://github.com/jfischoff/postgresql-queue#readme |
| Bug tracker | https://github.com/jfischoff/postgresql-queue/issues |
| Source repo | head: git clone https://github.com/jfischoff/postgresql-queue |
| Uploaded | by JonathanFischoff at 2017-12-21T03:26:39Z |
| Distributions | |
| Reverse Dependencies | 1 direct, 0 indirect [details] |
| Downloads | 7558 total (26 in the last 30 days) |
| Rating | (no votes yet) [estimated by Bayesian average] |
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| Status | Docs available [build log] Last success reported on 2017-12-21 [all 1 reports] |