Extension Manager:Sqlite Storage

Data Structures

Current Situation

Currently the extension manager caches add-on metadata, blocklist and disabled status. This is an incomplete list of the highlights:

• Add-on metadata (majority from install.rdf)
  • id
  • version
  • type
  • hidden
  • appManaged
  • targetApplication entries (modified by update checks)
  • default metadata
  • localized metadata
  • dependencies
  • appDisabled (set based on blocklist, compatibility and security)
  • userDisabled (user controlled)
  • available update (added by update checks)

• Pending installs (essentially a subset of the above items, added so they appear in the UI before restarting)

• Downloads (Used to display download progress in the UI)

The UI uses a template to display items, however it does not use the real extensions.rdf datasource. Instead a dynamic datasource is provided that calculates values for certain attributes:

• Add-on metadata
  • iconURL (may come from the real datasource, may be a direct file uri to a theme's icon)
  • previewImage (a direct file uri to the theme's preview image)
  • aboutURL (hidden if the add-on is disabled)
  • installDate (returns the mtime of the extension's directory)
  • compatible (returns whether the extension is compatible with the application)
  • providesUpdatesSecurely (whether the update path is secure)
  • satisfiesDependencies (whether all dependencies are available)
  • blocklisted (asks the blocklist service if the add-on is blocklisted)
  • opType (any pending operation for the add-on)
  • appManaged (can only return true if the extension is installed by the app)
  • hidden (can only return true if the extension is in a restricted install location)
  • locked (can only return true if the extension is in a restricted install location)
  • textual data (retrieved from properties, the localized area or the default area as appropriate)
  • isDisabled (based on appDisabled and userDisabled)
  • updateable (checks preferences and permissions to see if this add-on can be updated)

• Downloads
  • state (current install state)
  • progress (current download progress)