pubsub-tie

Basic hook for Google PubSub to enforce a number of auto-imposed basic rules on publication of events via PubSub messages:

1. Only white-listed events may be published
2. Enforce presence of required fields on events
3. Exclude fields nor required, optional, or repeated (array-like).
4. Check field type (all elements in a repeated field)

Installation

gem install pubsub_tie

Usage

Publish white-listed events by symbol (name) passing hash structure of attributes. Events are published to topic named after event name and prefixed by app-level prefix

require 'pubsub_tie'
evt = {'id' => 1, 'name' => 'John', 'email' => 'john@me.com'}
PubSubTie.publish(:user_updated, evt)
# published on topic 'my_app_name-user_updated'

Configuration

There are two required configuration files that are expected at config/gcp.yml and config/events.yml

gcp.yml contains Google Cloud Platform project name and service account's credentials file by environment

development:
  project: 'gcp-project'
  keyfile: 'name-of-google-credentials-file-to-be-found-on-config-directory'
production:
  ...

events.yml contains definition of valid events

app_prefix: my_app_name
events:
  - name: evt_name_0
    summary: 'what happened at 0'
    required:
      - name: one_required_field
        type: STRING|INT|FLOAT|TIMESTAMP|DATETIME|BOOL
      - name: another_required_field
        type: STRING|INT|FLOAT|TIMESTAMP|DATETIME|BOOL
    optional:
      - name: one_optional_field
        type: STRING|INT|FLOAT|TIMESTAMP|DATETIME|BOOL
    repeated:
      - name: one_array_like_field
        type: STRING|INT|FLOAT|TIMESTAMP|DATETIME|BOOL
  - name: evt_name_1
    summary: 'what happened at 1'
    required:
      - name: only_required_field
        type: STRING|INT|FLOAT|TIMESTAMP|DATETIME|BOOL

References

• Releasing the gem