Integration Events

As described in Architecture Overview holi uses Google Cloud Pub/Sub to communicate asynchronously and reliably between applications.

Event Types

Currently, the following events are emitted by holi-okuna:

Event Name	Description
UserNameUpdated	Emitted when a user updates their username.
UserEmailUpdated	Emitted when a user updates their email address.
UserDeleted	Emitted when a user deletes their account.
SpaceCreated	Emitted when a user creates a space.
SpaceUpdated	Emitted when a user updates a spaces attributes (e.g. name/slug)
SpaceUserAdded	Emitted when a user joins a space.
SpaceUserLeft	Emitted when a user leaves a space.
SpaceUserRemoved	Emitted when a user is removed from a space by a space administrator.
SpaceDeleted	Emitted when a space is deleted.

Event Payloads

Messages on Google Cloud Pub/Sub follow this (exemplary) structure:

{
  "message": {
    "data": "<BASE64_ENCODED_PAYLOAD>",
    "attributes": {
      "eventType": "SpaceCreated",
      "eventVersion": "1.0.0"
    }
  },
  "subscription": "projects/MY-PROJECT/subscriptions/MY-SUB"
}

For every event emitted by a holi emitter two key/value pairs are to be added to the attributes object:

• eventType: name of the event
• eventVersion: version of the event (uses semantic versioning)

At this point of time, there's no dedicated documentation for the data field of the event (which varies depending on eventType). Please refer to

• the publishers source code in holi-okuna, and
• the consumers source code e.g. in holi-chat-integration

to learn more about the payloads.

Publish/Subscribe Topics

Currently, topics are separated per environment only: okuna_$ENVIRONMENT (in which $ENVIRONMENT is either staging or production).