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CONTRIBUTING.md

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Contributing to Postgres Message Queue (PGMQ)

Installation

The fastest way to get started is by running the Tembo docker image, where PGMQ comes pre-installed.

docker run -d --name postgres -e POSTGRES_PASSWORD=postgres -p 5432:5432 quay.io/tembo/pgmq-pg:latest

Building from source

PGMQ requires the postgres-server-dev package to build. For example, to install version 14 on ubuntu:

sudo apt-get install postgres-server-dev-14

Installing Postgres

If you already have Postgres installed locally, you can skip to Install PGMQ to Postgres.

If you need to install Postgres or want to set up a new environment for PGMQ development, pgenv is a command line utility that makes it very easy to install and manage multiple versions of Postgres. Follow the installation instructions to install it. If you are on MacOS, you may need link brew link icu4c --force in order to successfully build Postgres.

Install Postgres 16.3

pgenv build 16.3
pgenv use 16.3

Connect to Postgres:

psql -U postgres

A fresh install will have not have PGMQ installed.

postgres=# \dx
                 List of installed extensions
  Name   | Version |   Schema   |         Description
---------+---------+------------+------------------------------
 plpgsql | 1.0     | pg_catalog | PL/pgSQL procedural language
(1 row)

Installing PGMQ

Clone the repo and change into the directory.

git clone https://github.com/tembo-io/pgmq.git
cd pgmq/pgmq-extension

Install PGMQ to Postgres

This will install the extension to the Postgres using the pg_config that is currently on your PATH. If you have multiple versions of Postgres installed, make sure you are using the correct installation by running make install PG_CONFIG=/path/to/pg_config.

make
make install

Finally, you can create the extension and get started with the example in the README.md.

CREATE EXTENSION pgmq cascade;

Installing pg_partman (optional)

If you are working with partitioned queues, you will need to install pg_partman version <= 4.7.0

make install-pg-partman

Then,

CREATE EXTENSION pg_partman;

Running tests

Tests are written for pg_regress and pg_isolation_regress. The latter is available on Postgres 14 and higher, so the Makefile skips them for earlier versions.

Once you have a postgres instance with the extension installed, run:

make installcheck

Releases

PGMQ Postgres Extension releases are automated through two Github workflows; Containers / Trunk packages, and PGXN distribution. To create a release:

  1. Update and commit the new valid semver version in pgmq.control.
  2. Create a Github release using the extension's version for the tag and title. Auto-generate the release notes and/or add more relevant details as needed.

Container Images

Postgres images with PGMQ and all required dependencies are built and published to quay.io/tembo-pg{PG_VERSION}-pgmq:{TAG} for all supported Postgres versions and PGMQ releases.

Extension Packages

The required extension files are publish to and hosted at pgt.dev and PGXN.

Client SDKs

See subdirectories for the Rust and Python SDK release processes.