This patch adds five CLI commands for the media cache:
* 'media cache show all' - display a summary of all items in the media
cache.
* 'media cache show <uri>' - display detailed information about a
single item in the media cache.
* 'media cache delete <uri>' - remove an item from the media cache, and
inform the bucket backend for the URI scheme to remove the item as
well.
* 'media cache refresh <uri>' - refresh a URI. If the item does not
exist in the media cache, the bucket backend will pull down the media
associated with the URI and create the item in the cache.
* 'media cache create <uri>' - create an item in the media cache from
some local media storage. Note that the bucket backend for the URI
scheme must still permit the item creation.
Change-Id: Id1c5707a3b8e2d96b56e4691a46a936cd171f4ae
This patch adds a new API to the Asterisk core that acts as a media
cache. The core API itself is mostly a thin wrapper around some bucket
API provided implementation that itself acts as the mechanism of
retrieval for media. The media cache API in the core provides the
following:
* A very thin in-memory cache of the active bucket_file items. Unlike a
more traditional cache, it provides no expiration mechanisms. Most
queries that hit the in-memory cache will also call into the bucket
implementations as well. The bucket implementations are responsible
for determining whether or not the active record is active and valid.
This makes sense for the most likely implementation of a media cache
backend, i.e., HTTP. The HTTP layer itself is the actual arbiter of
whether or not a record is truly active; as such, the in-memory cache
in the core has to defer to it.
* The ability to create new items in the media cache from local
resources. This allows for re-creation of items in the cache on
restart.
* Synchronization of items in the media cache to the AstDB. This
also includes various pieces of important metadata.
The API provides sufficient access that higher level APIs, such as the
file or app APIs, do not have to worry about the semantics of the bucket
APIs when needing to playback a resource.
In addition, this patch provides unit tests for the media cache API. The
unit tests use a fake bucket backend to verify correctness.
Change-Id: I11227abbf14d8929eeb140ddd101dd5c3820391e
Matt Jordan