Server Component for Gawati Client app

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The Gawati Editor Publication Cycle

The Gawati Editor supports a workflow based publication cycle, which allows moving a document from the Gawati Editor into the Gawati Portal. The act of publishing is not a synchronous one, the system has been designed with disconnected operations in mind i.e. the documents can be published from the Editor onto the portal, even if the portal is not immediately accessible. All publication info is pushed onto a message queue, from where it is asynchronously published onto the portal. So the act of publication may or may not be an instant one, depending on the speed of the internet or the availability of the portal at that point, among other factors.

Gawati Editor Publish Workflow

• User submits a document to be published on the Portal (gawati-data).
• editor-fe updates the state of the document to 'under_processing'.
• editor-fe places the iri on a request queue (IRI_Q) along with the action 'publish'.
• editor-qprocessor reads the iri from IRI_Q, prepares the zip and posts the zip package to portal-qprocessor.
• portal-qprocessor verifies the checksum of the incoming zip, stores it and places the path to the zip on the ZIP_Q.
• portal-publisher reads the ZIP_Q, extracts the zip and syncs the document with the Portal (gawati-data).
• portal-publisher updates the STATUS_Q thereafter.
• portal-qprocessor reads from STATUS_Q and posts the status to editor-qprocessor.
• editor-qprocessor writes the status on it's STATUS_Q (i.e the status queue on the editor side).
• editor-fe reads the STATUS_Q and updates status of the document if it has been successfully published.

The Gawati Editor Retraction Cycle

The Gawati Editor supports a workflow based retraction cycle, which allows retracting a document that has been published on the Gawati Portal (as listed above). Similar to publishing, retraction is asynchronous and happens via message queues. So the act of retraction may or may not be an instant one, depending on the speed of the internet or the availability of the portal at that point, among other factors.

Gawati Editor Retract Workflow

• User submits a document to be retracted from the Portal (gawati-data).
• editor-fe updates the state of the document to 'under_retraction'.
• editor-fe places the iri on a request queue (IRI_Q) along with the action 'retract'.
• editor-qprocessor reads the iri from IRI_Q, and posts it to portal-qprocessor.
• portal-qprocessor places the iri on Portal's IRI_Q. Note that there are two different IRI_Qs, one on the Editor (accessed by editor-fe & editor-qprocessor) and one on the Portal (accessed by portal-qprocessor & portal-publisher).
• portal-publisher reads the IRI_Q, deletes the attachments associated with the IRI from its file system and purges the document from the Portal (gawati-data).
• portal-publisher updates the STATUS_Q thereafter.
• portal-qprocessor reads from STATUS_Q and posts the status to editor-qprocessor.
• editor-qprocessor writes the status on it's STATUS_Q (i.e the status queue on the editor side).
• editor-fe reads the STATUS_Q and updates status of the document if it has been successfully retracted.

Notes:

• There are two Queue Exchanges

  • editor_doc_publish: This is the exchange on the Editor side. It constists of two queues
    • IRI_Q
    • STATUS_Q
  • portal_doc_publish: This is the exchange on the Portal side. It constists of three queues
    • ZIP_Q
    • STATUS_Q
    • IRI_Q

• The two STATUS_Qs and IRI_Qs have no relation with each other.

• Roles

  • editor-fe: Publishes on IRI_Q, Consumes STATUS_Q
  • editor-qprocessor: Publishes on STATUS_Q, Consumes IRI_Q.
  • portal-qprocessor: Publishes on ZIP_Q & IRI_Q, Consumes STATUS_Q
  • portal-publisher: Publishes on STATUS_Q, Consumes ZIP_Q & IRI_Q.

• Status Object: {iri, status, message, action}.
  status can be 'under_processing', 'under_retraction', 'failed', 'published'.
  action can be 'publish' or 'retract'.

  Note however, that the document state is updated to under_processing or under_retraction as soon as the user submits the publish/retract request. The document status is again updated only when the status is published or retracted. The statuses under_processing, under_retraction and failed in Status Object are only meant for exchaging information about the progress of the publish workflow and do not trigger document state updates (ASHOK: This last point merits further discussion).

• Sign Aware: If a document is digitally signed via the Editor, the public key associated with it is also published or retracted.

Setup

Publishing/Retraction Workflow consists of several components which need to be started in the given order:

1. Start the Editor components
   • gawati-client-data (eXist-db)
   • gawati-editor-qprocessor
   • gawati-editor-fe
   • gawati-editor-ui
2. Start the Portal components
   • gawati-data (eXist-db)
   • gawati-portal-publisher
   • gawati-portal-qprocessor

Dependencies

1. The workflow requires
   • gawati-editor-fe and gawati-editor-processor to be on the same system.
   • gawati-portal-qprocessor and gawati-portal-publisher to be on the same system
2. Base dependencies: Erlang 20.3, RabitMQ-Server 3.7.5

Publish Workflow Diagram

Deleting Exchange

For development purposes if you ever need to reset the rabbitmq exchange, run delete_exchange_queues from the rabbitmq server folder