Message DB

Microservice Native Event Store and Message Store for Postgres

A fully-featured event store and message store implemented in PostgreSQL for Pub/Sub, Event Sourcing, Messaging, and Evented Microservices applications.

Features

• Pub/Sub
• JSON message data
• Event streams
• Stream categories
• Metadata
• Message queues
• Message storage
• Consumer groups
• Service host
• Administration tools
• Reports

Rationale

An event sourcing and Pub/Sub message store built on Postgres for simple cloud or local hosting. A minimalist implementation of the essential features of tools like Event Store or Kafka, with built-in support for messaging patterns like Pub/Sub, and consumer patterns like consumer groups.

Message DB was extracted from the Eventide Project to make it easier for users to write clients in the language of their choosing.

User Guide

A complete user guide is available on the Eventide Project docs site:

http://docs.eventide-project.org/user-guide/message-db/

Ruby Distribution of Message DB

This library is a Ruby Gem package of the Message DB database for Postgres.

For more information, see:

https://github.com/message-db/message-db

This package also includes executable scripts installed into the RubyGems execution search path.

For more information on the executables, see:

http://docs.eventide-project.org/user-guide/message-db/tools.html

Installation

gem install message-db

Create the Postgres Database

Running the database installation tool creates the database, schema, table, indexes, functions, views, types, a user role, and limit the user's privileges to the message store's public interface.

Note: Make sure that your default Postgres user has administrative privileges.

The database installation Ruby executable will be installed with the message-db gem. The executable will be in the gem executable search path and may also be executed through bundler:

bundle exec mdb-create-db

For more information about Ruby executables installed with the message-db Ruby Gem, see the Eventide docs on the administration tools that are bundled with the gem:

http://docs.eventide-project.org/user-guide/message-db/tools.html

Database Name

By default, the database creation tool will create a database named message_store.

If you prefer either a different database name, you can override the name using the DATABASE_NAME environment variable.

DATABASE_NAME=some_other_database bundle exec mdb-create-db

License

The message-db library is released under the MIT License.