This repository contains configuration for a Docker image that contains the Google Cloud Pub/Sub emulator. It is Dockerised version of https://cloud.google.com/pubsub/docs/emulator that provides additional options for configuration.

This shell statement shows the basic usage, which will create a Pub/Sub emulator running on port 8085, with a project name of "testproject", a default topic of "testtopic" and a subscription of "testsubscription".

docker run --rm --publish 8085:8085 jamesblewis/go-pubsub-emulator:latest

Much like jesse's original pkg you can also configure the Pub/Sub project name, topic name, subscription name and exposure port:

docker run --rm --env PUBSUB_PROJECT=myproject --env PUBSUB_TOPIC=mytopic --env PUBSUB_SUBSCRIPTION=mysubscription --env PUBSUB_PORT=10101 --publish 10101:10101 jamesblewis/go-pubsub-emulator:latest

This image allows you to specify more complex config via yaml for when you need multiple topics and subscriptions.

docker run --rm --env --mount source=./path/to/your/config,target=config/ --publish 10101:10101 jamesblewis/go-pubsub-emulator:latest

The yaml config should look something like this:

topics:
  topic1:
    - subscription1
    - subscription2
  topic2:
    - subscription3
    - subscription4

This is the equivalent configuration for docker-compose, with custom environment variables for the project name, topic name, subscription name and Pub/Sub port.

version: '3'
  services:
    pubsub:
      image: jamesblewis/go-pubsub-emulator:latest
      platform: linux/amd64
      environment:
        - PUBSUB_PORT=10101
        - PUBSUB_PROJECT=myproject
        - PUBSUB_TOPIC=mytopic
        - PUBSUB_SUBSCRIPTION=mysubscription

To pass your config as yaml simply mount it inside the config folder.

Note that you will still need to pass the port and project as an environment variable but the yaml will override any other environment variable you may set.

version: '3'
  services:
    pubsub:
      image: jamesblewis/go-pubsub-emulator:latest
      platform: linux/amd64
      environment:
        - PUBSUB_PORT=10101
        - PUBSUB_PROJECT=myproject
      volumes:
        - ./pubsub-config.yaml:/config/pubsub.yaml

This image is based on jacksonjesse/pubsub-emulator.