Initial support for endpoints.

An endpoint is an external device/system that may offer/accept
channels to/from Asterisk. While this is a very useful concept for end
users, it is surprisingly not a core concept within Asterisk itself.

This patch defines ast_endpoint as a separate object, which channel
drivers may use to expose their concept of an endpoint. As the channel
driver creates channels, it can use ast_endpoint_add_channel() to
associate channels to the endpoint. This updated the endpoint
appropriately, and forwards all of the channel's events to the
endpoint's topic.

In order to avoid excessive locking on the endpoint object itself, the
mutable state is not accessible via getters. Instead, you can create a
snapshot using ast_endpoint_snapshot_create() to get a consistent
snapshot of the internal state.

This patch also includes a set of topics and messages associated with
endpoints, and implementations of the endpoint-related RESTful
API. chan_sip was updated to create endpoints with SIP peers, but the
state of the endpoints is not updated with the state of the peer.

Along for the ride in this patch is a Stasis test API. This is a
stasis_message_sink object, which can be subscribed to a Stasis
topic. It has functions for blocking while waiting for conditions in
the message sink to be fulfilled.

(closes issue ASTERISK-21421)
Review: https://reviewboard.asterisk.org/r/2492/



git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@387932 65c4cc65-6c06-0410-ace0-fbb531ad65f3

1 files changed, 16 insertions, 0 deletions

diff --git a/include/asterisk/stasis.h b/include/asterisk/stasis.h
index 07c3c5c6b..48d51e369 100644
--- a/include/asterisk/stasis.h
+++ b/include/asterisk/stasis.h
@@ -431,6 +431,22 @@ struct stasis_cache_update {
 };
 
 /*!
+ * \brief Cache clear message.
+ */
+struct stasis_cache_clear {
+	/*! Type of object being cleared from the cache */
+	struct stasis_message_type *type;
+	/*! Id of the object being cleared from the cache */
+	char id[];
+};
+
+/*!
+ * \brief Message type for \ref stasis_cache_clear.
+ * \since 12
+ */
+struct stasis_message_type *stasis_cache_clear_type(void);
+
+/*!
  * \brief A message which instructs the caching topic to remove an entry from its cache.
  * \param type Message type.
  * \param id Unique id of the snapshot to clear.