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stasis: Use an implementation specific channel snapshot cache.

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Channels no longer use the Stasis cache for channel snapshots. Instead
they are stored in a hash table in stasis_channels which reduces the
number of Stasis messages created and allows better storage.

As a result the following APIs are no longer available since the stasis
cache is no longer used:
ast_channel_topic_cached()
ast_channel_topic_all_cached()

The ast_channel_cache_all() and ast_channel_cache_by_name() functions
now return an ao2_container of ast_channel_snapshots rather than
a container of stasis_messages therefore you can't (and don't need
to) call stasis_cache functions on it.

The ast_channel_topic_all() function now returns a normal topic not
a cached one so you can't use stasis cache functions on it either.

The ast_channel_snapshot_type() stasis message now has the
ast_channel_snapshot_update structure as it's data. It contains the
last snapshot and the new one.

ast_channel_snapshot_get_latest() still returns the latest snapshot.

The latest snapshot is now stored on the channel itself to eliminate
cache hits when Stasis messages that have the snapshot as a payload
are created.

ASTERISK-28102

Change-Id: I9334febff60a82d7c39703e49059fa3a68825786
This commit is contained in:
Joshua Colp
2018-10-10 11:28:18 -03:00
parent 0a60bc1a68
commit d0ccbb3377
28 changed files with 456 additions and 551 deletions
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7
main/bridge.c
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@@ -5150,16 +5150,15 @@ static int bridge_show_specific_print_channel(void *obj, void *arg, int flags)
{
const char *uniqueid = obj;
struct ast_cli_args *a = arg;
RAII_VAR(struct stasis_message *, msg, NULL, ao2_cleanup);
struct ast_channel_snapshot *snapshot;
msg = stasis_cache_get(ast_channel_cache(), ast_channel_snapshot_type(), uniqueid);
if (!msg) {
snapshot = ast_channel_snapshot_get_latest(uniqueid);
if (!snapshot) {
return 0;
}
snapshot = stasis_message_data(msg);
ast_cli(a->fd, "Channel: %s\n", snapshot->name);
ao2_ref(snapshot, -1);
return 0;
}