@activitypods/synchronizer NPM

Synchronizer Service

An ActivityPods service to notify of objects' updates.

When a watched object is updated or deleted, automatically send an activity to the actors who have the right to view this object.

Usage

The SynchronizerService is included in the CoreService. The easiest way to make use of it is to import the SynchronizerMixin along with the ControlledContainerMixin.

const { ControlledContainerMixin } = require('@semapps/ldp');
const { SynchronizerMixin } = require('@activitypods/synchronizer');

module.exports = {
  name: 'events',
  mixins: [SynchronizerMixin, ControlledContainerMixin], // In that order
  settings: {
    path: '/events',
    acceptedTypes: ['Event']
  }
}

Note: The SynchronizerMixin must be added before the ControlledContainerMixin, as it overrides its delete action.

Actions

`watch`

Watch a new type of object.

Parameters

Property	Type	Default	Description
`type`	`String`	required	The type of resource we want to watch

`announceUpdate`

Announce an object update to all actors who have the right to view this object.

Parameters

Property	Type	Default	Description
`objectUri`	`String`	required	The URI of resource which has been updated
`newData`	`Object`	required	The content of the resource (in JSON-LD)

`announceDelete`

Announce an object deletion to all actors who have the right to view this object.

Parameters

Property	Type	Default	Description
`objectUri`	`String`	required	The URI of resource which has been deleted
`oldData`	`Object`	required	The content of the resource before it was deleted (in JSON-LD)

Handled activities

Announce update

{
  "type": "Announce",
  "object": {
    "type": "Update",
    "object": {
      "type": "[WATCHED TYPES]"
    }
  }
}

Emitter's side effects

None

Recipients' side effects

The object cached in the recipients' PODs is refreshed

Announce delete

{
  "type": "Announce",
  "object": {
    "type": "Delete",
    "object": {
      "formerType": "[WATCHED TYPES]"
    }
  }
}

Emitter's side effects

None

Recipients' side effects

The object cached in the recipients' PODs is deleted

@semapps/ldp @semapps/mime-types @semapps/activitypub

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