[Asterisk-code-review] bridges: Remove reliance on stasis caching (asterisk[master])

George Joseph asteriskteam at digium.com
Thu Nov 29 15:05:34 CST 2018


George Joseph has submitted this change and it was merged. ( https://gerrit.asterisk.org/10227 )

Change subject: bridges:  Remove reliance on stasis caching
......................................................................

bridges:  Remove reliance on stasis caching

* The bridging core no longer uses the stasis cache for bridge
  snapshots.  The latest bridge snapshot is now stored on the
  ast_bridge structure itself.

* The following APIs are no longer available since the stasis cache
  is no longer used:
    ast_bridge_topic_cached()
    ast_bridge_topic_all_cached()

* A topic pool is now used for individual bridge topics.

* The ast_bridge_cache() function was removed since there's no
  longer a separate container of snapshots.

* A new function "ast_bridges()" was created to retrieve the
  container of all bridges.  Users formerly calling
  ast_bridge_cache() can use the new function to iterate over
  bridges and retrieve the latest snapshot directly from the
  bridge.

* The ast_bridge_snapshot_get_latest() function was renamed to
  ast_bridge_get_snapshot_by_uniqueid().

* A new function "ast_bridge_get_snapshot()" was created to retrieve
  the bridge snapshot directly from the bridge structure.

* The ast_bridge_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_bridge_snapshot_type() stasis message now has the
  ast_bridge_snapshot_update structure as it's data.  It contains
  the last snapshot and the new one.

* cdr, cel, manager and ari have been updated to use the new
  arrangement.

Change-Id: I7049b80efa88676ce5c4666f818fa18ad1985369
---
M CHANGES
M UPGRADE.txt
M apps/confbridge/confbridge_manager.c
M include/asterisk/bridge.h
M include/asterisk/stasis_bridges.h
M main/Makefile
M main/bridge.c
M main/cdr.c
M main/cel.c
M main/manager_bridges.c
M main/stasis_bridges.c
M res/ari/resource_bridges.c
M res/res_stasis.c
M res/stasis/app.c
M tests/test_cel.c
15 files changed, 397 insertions(+), 340 deletions(-)

Approvals:
  Joshua Colp: Looks good to me, but someone else must approve
  Kevin Harwell: Looks good to me, approved
  George Joseph: Approved for Submit



diff --git a/CHANGES b/CHANGES
index 111a030..5a68001 100644
--- a/CHANGES
+++ b/CHANGES
@@ -35,6 +35,42 @@
    ast_channel_snapshot_update structure as it's data.
    ast_channel_snapshot_get_latest() still returns the latest snapshot.
 
+Bridging
+------------------
+ * The bridging core no longer uses the stasis cache for bridge
+   snapshots.  The latest bridge snapshot is now stored on the
+   ast_bridge structure itself.
+
+ * The following APIs are no longer available since the stasis cache
+   is no longer used:
+     ast_bridge_topic_cached()
+     ast_bridge_topic_all_cached()
+
+ * A topic pool is now used for individual bridge topics.
+
+ * The ast_bridge_cache() function was removed since there's no
+   longer a separate container of snapshots.
+
+ * A new function "ast_bridges()" was created to retrieve the
+   container of all bridges.  Users formerly calling
+   ast_bridge_cache() can use the new function to iterate over
+   bridges and retrieve the latest snapshot directly from the
+   bridge.
+
+ * The ast_bridge_snapshot_get_latest() function was renamed to
+   ast_bridge_get_snapshot_by_uniqueid().
+
+ * A new function "ast_bridge_get_snapshot()" was created to retrieve
+   the bridge snapshot directly from the bridge structure.
+
+ * The ast_bridge_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_bridge_snapshot_type() stasis message now has the
+   ast_bridge_snapshot_update structure as it's data.  It contains
+   the last snapshot and the new one.
+
 ------------------------------------------------------------------------------
 --- Functionality changes from Asterisk 16.0.0 to Asterisk 16.1.0 ------------
 ------------------------------------------------------------------------------
diff --git a/UPGRADE.txt b/UPGRADE.txt
index c299d83..53e9c4a 100644
--- a/UPGRADE.txt
+++ b/UPGRADE.txt
@@ -58,3 +58,34 @@
    The ast_channel_snapshot_type() stasis message now has the
    ast_channel_snapshot_update structure as it's data.
    ast_channel_snapshot_get_latest() still returns the latest snapshot.
+
+Applications
+ - The JabberStatus application, deprecated in Asterisk 12, has been removed.
+
+Bridging
+ - The bridging core no longer uses the stasis cache for bridge
+   snapshots.  The latest bridge snapshot is now stored on the
+   ast_bridge structure itself.
+ - The following APIs are no longer available since the stasis cache
+   is no longer used:
+     ast_bridge_topic_cached()
+     ast_bridge_topic_all_cached()
+ - A topic pool is now used for individual bridge topics.
+ - The ast_bridge_cache() function was removed since there's no
+   longer a separate container of snapshots.
+ - A new function "ast_bridges()" was created to retrieve the
+   container of all bridges.  Users formerly calling
+   ast_bridge_cache() can use the new function to iterate over
+   bridges and retrieve the latest snapshot directly from the
+   bridge.
+ - The ast_bridge_snapshot_get_latest() function was renamed to
+   ast_bridge_get_snapshot_by_uniqueid().
+ - A new function "ast_bridge_get_snapshot()" was created to retrieve
+   the bridge snapshot directly from the bridge structure.
+ - The ast_bridge_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_bridge_snapshot_type() stasis message now has the
+   ast_bridge_snapshot_update structure as it's data.  It contains
+   the last snapshot and the new one.
+
diff --git a/apps/confbridge/confbridge_manager.c b/apps/confbridge/confbridge_manager.c
index 2d85033..b1819ca 100644
--- a/apps/confbridge/confbridge_manager.c
+++ b/apps/confbridge/confbridge_manager.c
@@ -712,7 +712,7 @@
 	STASIS_MESSAGE_TYPE_INIT(confbridge_welcome_type);
 
 	bridge_state_router = stasis_message_router_create(
-		ast_bridge_topic_all_cached());
+		ast_bridge_topic_all());
 
 	if (!bridge_state_router) {
 		return -1;
diff --git a/include/asterisk/bridge.h b/include/asterisk/bridge.h
index f4b1df8..e4d11e8 100644
--- a/include/asterisk/bridge.h
+++ b/include/asterisk/bridge.h
@@ -75,6 +75,7 @@
 #include "asterisk/dsp.h"
 #include "asterisk/uuid.h"
 
+struct a02_container;
 struct ast_bridge_technology;
 struct ast_bridge;
 struct ast_bridge_tech_optimizations;
@@ -300,6 +301,39 @@
 AST_LIST_HEAD_NOLOCK(ast_bridge_channels_list, ast_bridge_channel);
 
 /*!
+ * \brief Structure that contains a snapshot of information about a bridge
+ */
+struct ast_bridge_snapshot {
+	AST_DECLARE_STRING_FIELDS(
+		/*! Immutable bridge UUID. */
+		AST_STRING_FIELD(uniqueid);
+		/*! Bridge technology that is handling the bridge */
+		AST_STRING_FIELD(technology);
+		/*! Bridge subclass that is handling the bridge */
+		AST_STRING_FIELD(subclass);
+		/*! Creator of the bridge */
+		AST_STRING_FIELD(creator);
+		/*! Name given to the bridge by its creator */
+		AST_STRING_FIELD(name);
+		/*! Unique ID of the channel providing video, if one exists */
+		AST_STRING_FIELD(video_source_id);
+	);
+	/*! AO2 container of bare channel uniqueid strings participating in the bridge.
+	 * Allocated from ast_str_container_alloc() */
+	struct ao2_container *channels;
+	/*! Bridge flags to tweak behavior */
+	struct ast_flags feature_flags;
+	/*! Bridge capabilities */
+	uint32_t capabilities;
+	/*! Number of channels participating in the bridge */
+	unsigned int num_channels;
+	/*! Number of active channels in the bridge. */
+	unsigned int num_active;
+	/*! The video mode of the bridge */
+	enum ast_bridge_video_mode_type video_mode;
+};
+
+/*!
  * \brief Structure that contains information about a bridge
  */
 struct ast_bridge {
@@ -312,7 +346,7 @@
 	/*! Private information unique to the bridge technology */
 	void *tech_pvt;
 	/*! Per-bridge topics */
-	struct stasis_cp_single *topics;
+	struct stasis_topic *topic;
 	/*! Call ID associated with the bridge */
 	ast_callid callid;
 	/*! Linked list of channels participating in the bridge */
@@ -358,12 +392,27 @@
 
 	/*! Type mapping used for media routing */
 	struct ast_vector_int media_types;
+	/*! Current bridge snapshot */
+	struct ast_bridge_snapshot *current_snapshot;
 };
 
 /*! \brief Bridge base class virtual method table. */
 extern struct ast_bridge_methods ast_bridge_base_v_table;
 
 /*!
+ * \brief Returns the global bridges container
+ * \since 17.0
+ *
+ * \retval a pointer to the bridges container success
+ * \retval NULL on failure
+ *
+ * \note You must use ao2_ref(<container>, -1) when done with it
+ *
+ * \warning You must not attempt to modify the container returned.
+ */
+struct ao2_container *ast_bridges(void);
+
+/*!
  * \brief Create a new base class bridge
  *
  * \param capabilities The capabilities that we require to be used on the bridge
diff --git a/include/asterisk/stasis_bridges.h b/include/asterisk/stasis_bridges.h
index a455a5b..4d80955 100644
--- a/include/asterisk/stasis_bridges.h
+++ b/include/asterisk/stasis_bridges.h
@@ -31,37 +31,9 @@
 #include "asterisk/bridge.h"
 #include "asterisk/pbx.h"
 
-/*!
- * \brief Structure that contains a snapshot of information about a bridge
- */
-struct ast_bridge_snapshot {
-	AST_DECLARE_STRING_FIELDS(
-		/*! Immutable bridge UUID. */
-		AST_STRING_FIELD(uniqueid);
-		/*! Bridge technology that is handling the bridge */
-		AST_STRING_FIELD(technology);
-		/*! Bridge subclass that is handling the bridge */
-		AST_STRING_FIELD(subclass);
-		/*! Creator of the bridge */
-		AST_STRING_FIELD(creator);
-		/*! Name given to the bridge by its creator */
-		AST_STRING_FIELD(name);
-		/*! Unique ID of the channel providing video, if one exists */
-		AST_STRING_FIELD(video_source_id);
-	);
-	/*! AO2 container of bare channel uniqueid strings participating in the bridge.
-	 * Allocated from ast_str_container_alloc() */
-	struct ao2_container *channels;
-	/*! Bridge flags to tweak behavior */
-	struct ast_flags feature_flags;
-	/*! Bridge capabilities */
-	uint32_t capabilities;
-	/*! Number of channels participating in the bridge */
-	unsigned int num_channels;
-	/*! Number of active channels in the bridge. */
-	unsigned int num_active;
-	/*! The video mode of the bridge */
-	enum ast_bridge_video_mode_type video_mode;
+struct ast_bridge_snapshot_update {
+	struct ast_bridge_snapshot *old_snapshot;
+	struct ast_bridge_snapshot *new_snapshot;
 };
 
 /*!
@@ -101,22 +73,6 @@
 
 /*!
  * \since 12
- * \brief A topic which publishes the events for a particular bridge.
- *
- * \ref ast_bridge_snapshot messages are replaced with stasis_cache_update
- * messages.
- *
- * If the given \a bridge is \c NULL, ast_bridge_topic_all_cached() is returned.
- *
- * \param bridge Bridge for which to get a topic or \c NULL.
- *
- * \retval Topic for bridge's events.
- * \retval ast_bridge_topic_all() if \a bridge is \c NULL.
- */
-struct stasis_topic *ast_bridge_topic_cached(struct ast_bridge *bridge);
-
-/*!
- * \since 12
  * \brief A topic which publishes the events for all bridges.
  * \retval Topic for all bridge events.
  */
@@ -124,22 +80,6 @@
 
 /*!
  * \since 12
- * \brief A caching topic which caches \ref ast_bridge_snapshot messages from
- * ast_bridge_events_all(void).
- *
- * \retval Caching topic for all bridge events.
- */
-struct stasis_topic *ast_bridge_topic_all_cached(void);
-
-/*!
- * \since 12
- * \brief Backend cache for ast_bridge_topic_all_cached().
- * \retval Cache of \ref ast_bridge_snapshot.
- */
-struct stasis_cache *ast_bridge_cache(void);
-
-/*!
- * \since 12
  * \brief Publish the state of a bridge
  *
  * \pre Bridge is locked
@@ -490,18 +430,32 @@
 struct stasis_message_type *ast_attended_transfer_type(void);
 
 /*!
- * \brief Returns the most recent snapshot for the bridge.
+ * \brief Returns the current snapshot for the bridge.
+ * \since 17.0
  *
  * The returned pointer is AO2 managed, so ao2_cleanup() when you're done.
  *
- * \param bridge_id Uniqueid of the bridge for which to get the snapshot.
+ * \param bridge_id Uniqueid of the bridge from which to get the snapshot.
  * \return Most recent snapshot. ao2_cleanup() when done.
- * \return \c NULL if channel isn't in cache.
+ * \return \c NULL if bridge or snapshot doesn't exist.
  */
-struct ast_bridge_snapshot *ast_bridge_snapshot_get_latest(
+struct ast_bridge_snapshot *ast_bridge_get_snapshot_by_uniqueid(
 	const char *bridge_id);
 
 /*!
+ * \brief Returns the current snapshot for the bridge.
+ * \since 17.0
+ *
+ * The returned pointer is AO2 managed, so ao2_cleanup() when you're done.
+ *
+ * \param bridge The bridge from which to get the snapshot.
+ * \return Most recent snapshot. ao2_cleanup() when done.
+ * \return \c NULL if there isn't a snapshot.
+ */
+struct ast_bridge_snapshot *ast_bridge_get_snapshot(
+	struct ast_bridge *bridge);
+
+/*!
  * \internal
  * \brief Initialize the topics for a single bridge.
  * \return 0 on success.
@@ -511,6 +465,15 @@
 
 /*!
  * \internal
+ * \since 17.0
+ * \brief Publish destroy then cleanup topics.
+ *
+ * \param bridge The bridge to clean up
+ */
+void bridge_topics_destroy(struct ast_bridge *bridge);
+
+/*!
+ * \internal
  * \brief Initialize the stasis bridging topic and message types
  * \retval 0 on success
  * \retval -1 on failure
diff --git a/main/Makefile b/main/Makefile
index 1cb2c25..a22a1ad 100644
--- a/main/Makefile
+++ b/main/Makefile
@@ -167,6 +167,7 @@
 sched.o: _ASTCFLAGS+=$(call get_menuselect_cflags,DEBUG_SCHEDULER DUMP_SCHEDULER)
 tcptls.o: _ASTCFLAGS+=$(OPENSSL_INCLUDE) -Wno-deprecated-declarations
 uuid.o: _ASTCFLAGS+=$(UUID_INCLUDE)
+stasis.o: _ASTCFLAGS+=$(call get_menuselect_cflags,AO2_DEBUG)
 
 
 OBJS:=$(sort $(OBJS))
diff --git a/main/bridge.c b/main/bridge.c
index a65927d..1bee2e6 100644
--- a/main/bridge.c
+++ b/main/bridge.c
@@ -171,6 +171,11 @@
 /*! Bridge manager controller. */
 static struct bridge_manager_controller *bridge_manager;
 
+struct ao2_container *ast_bridges(void)
+{
+	return ao2_bump(bridges);
+}
+
 /*!
  * \internal
  * \brief Request service for a bridge from the bridge manager.
@@ -650,25 +655,6 @@
 	}
 }
 
-static struct stasis_message *create_bridge_snapshot_message(struct ast_bridge *bridge)
-{
-	RAII_VAR(struct ast_bridge_snapshot *, snapshot, NULL, ao2_cleanup);
-
-	if (!ast_bridge_snapshot_type()) {
-		return NULL;
-	}
-
-	ast_bridge_lock(bridge);
-	snapshot = ast_bridge_snapshot_create(bridge);
-	ast_bridge_unlock(bridge);
-
-	if (!snapshot) {
-		return NULL;
-	}
-
-	return stasis_message_create(ast_bridge_snapshot_type(), snapshot);
-}
-
 static void destroy_bridge(void *obj)
 {
 	struct ast_bridge *bridge = obj;
@@ -677,17 +663,7 @@
 		bridge->uniqueid, bridge->v_table->name);
 
 	if (bridge->construction_completed) {
-		RAII_VAR(struct stasis_message *, clear_msg, NULL, ao2_cleanup);
-
-		clear_msg = create_bridge_snapshot_message(bridge);
-		if (clear_msg) {
-			RAII_VAR(struct stasis_message *, msg, NULL, ao2_cleanup);
-
-			msg = stasis_cache_clear_create(clear_msg);
-			if (msg) {
-				stasis_publish(ast_bridge_topic(bridge), msg);
-			}
-		}
+		bridge_topics_destroy(bridge);
 	}
 
 	/* Do any pending actions in the context of destruction. */
@@ -726,9 +702,8 @@
 
 	cleanup_video_mode(bridge);
 
-	stasis_cp_single_unsubscribe(bridge->topics);
-
 	ast_string_field_free_memory(bridge);
+	ao2_cleanup(bridge->current_snapshot);
 }
 
 struct ast_bridge *bridge_register(struct ast_bridge *bridge)
@@ -2008,6 +1983,9 @@
 {
 	struct ast_bridge_channel *bridge_channel;
 
+	ast_debug(1, "Removing channel %s from bridge %s\n",
+		ast_channel_name(chan), bridge->uniqueid);
+
 	ast_bridge_lock(bridge);
 
 	/* Try to find the channel that we want to remove */
@@ -5071,43 +5049,13 @@
 	return NULL;
 }
 
-static char *complete_bridge_stasis(const char *word)
-{
-	int wordlen = strlen(word);
-	struct ao2_container *cached_bridges;
-	struct ao2_iterator iter;
-	struct stasis_message *msg;
-
-	cached_bridges = stasis_cache_dump(ast_bridge_cache(), ast_bridge_snapshot_type());
-	if (!cached_bridges) {
-		return NULL;
-	}
-
-	iter = ao2_iterator_init(cached_bridges, 0);
-	for (; (msg = ao2_iterator_next(&iter)); ao2_ref(msg, -1)) {
-		struct ast_bridge_snapshot *snapshot = stasis_message_data(msg);
-
-		if (!strncasecmp(word, snapshot->uniqueid, wordlen)) {
-			if (ast_cli_completion_add(ast_strdup(snapshot->uniqueid))) {
-				ao2_ref(msg, -1);
-				break;
-			}
-		}
-	}
-	ao2_iterator_destroy(&iter);
-	ao2_ref(cached_bridges, -1);
-
-	return NULL;
-}
-
 static char *handle_bridge_show_all(struct ast_cli_entry *e, int cmd, struct ast_cli_args *a)
 {
 #define FORMAT_HDR "%-36s %5s %-15s %s\n"
 #define FORMAT_ROW "%-36s %5u %-15s %s\n"
 
-	RAII_VAR(struct ao2_container *, cached_bridges, NULL, ao2_cleanup);
 	struct ao2_iterator iter;
-	struct stasis_message *msg;
+	struct ast_bridge *bridge;
 
 	switch (cmd) {
 	case CLI_INIT:
@@ -5120,25 +5068,23 @@
 		return NULL;
 	}
 
-	cached_bridges = stasis_cache_dump(ast_bridge_cache(), ast_bridge_snapshot_type());
-	if (!cached_bridges) {
-		ast_cli(a->fd, "Failed to retrieve cached bridges\n");
-		return CLI_SUCCESS;
-	}
-
 	ast_cli(a->fd, FORMAT_HDR, "Bridge-ID", "Chans", "Type", "Technology");
 
-	iter = ao2_iterator_init(cached_bridges, 0);
-	for (; (msg = ao2_iterator_next(&iter)); ao2_ref(msg, -1)) {
-		struct ast_bridge_snapshot *snapshot = stasis_message_data(msg);
+	iter = ao2_iterator_init(bridges, 0);
+	for (; (bridge = ao2_iterator_next(&iter)); ao2_ref(bridge, -1)) {
+		struct ast_bridge_snapshot *snapshot = ast_bridge_get_snapshot(bridge);
 
-		ast_cli(a->fd, FORMAT_ROW,
-			snapshot->uniqueid,
-			snapshot->num_channels,
-			S_OR(snapshot->subclass, "<unknown>"),
-			S_OR(snapshot->technology, "<unknown>"));
+		if (snapshot) {
+			ast_cli(a->fd, FORMAT_ROW,
+				snapshot->uniqueid,
+				snapshot->num_channels,
+				S_OR(snapshot->subclass, "<unknown>"),
+				S_OR(snapshot->technology, "<unknown>"));
+			ao2_ref(snapshot, -1);
+		}
 	}
 	ao2_iterator_destroy(&iter);
+
 	return CLI_SUCCESS;
 
 #undef FORMAT_HDR
@@ -5165,7 +5111,6 @@
 
 static char *handle_bridge_show_specific(struct ast_cli_entry *e, int cmd, struct ast_cli_args *a)
 {
-	RAII_VAR(struct stasis_message *, msg, NULL, ao2_cleanup);
 	struct ast_bridge_snapshot *snapshot;
 
 	switch (cmd) {
@@ -5177,7 +5122,7 @@
 		return NULL;
 	case CLI_GENERATE:
 		if (a->pos == 2) {
-			return complete_bridge_stasis(a->word);
+			return complete_bridge_live(a->word);
 		}
 		return NULL;
 	}
@@ -5186,18 +5131,17 @@
 		return CLI_SHOWUSAGE;
 	}
 
-	msg = stasis_cache_get(ast_bridge_cache(), ast_bridge_snapshot_type(), a->argv[2]);
-	if (!msg) {
+	snapshot = ast_bridge_get_snapshot_by_uniqueid(a->argv[2]);
+	if (!snapshot) {
 		ast_cli(a->fd, "Bridge '%s' not found\n", a->argv[2]);
 		return CLI_SUCCESS;
 	}
-
-	snapshot = stasis_message_data(msg);
 	ast_cli(a->fd, "Id: %s\n", snapshot->uniqueid);
 	ast_cli(a->fd, "Type: %s\n", S_OR(snapshot->subclass, "<unknown>"));
 	ast_cli(a->fd, "Technology: %s\n", S_OR(snapshot->technology, "<unknown>"));
 	ast_cli(a->fd, "Num-Channels: %u\n", snapshot->num_channels);
 	ao2_callback(snapshot->channels, OBJ_NODATA, bridge_show_specific_print_channel, a);
+	ao2_ref(snapshot, -1);
 
 	return CLI_SUCCESS;
 }
diff --git a/main/cdr.c b/main/cdr.c
index 2e3b205..462c3e6 100644
--- a/main/cdr.c
+++ b/main/cdr.c
@@ -4288,7 +4288,7 @@
 	if (!channel_subscription) {
 		return -1;
 	}
-	bridge_subscription = stasis_forward_all(ast_bridge_topic_all_cached(), cdr_topic);
+	bridge_subscription = stasis_forward_all(ast_bridge_topic_all(), cdr_topic);
 	if (!bridge_subscription) {
 		return -1;
 	}
diff --git a/main/cel.c b/main/cel.c
index 242aeff..95376db 100644
--- a/main/cel.c
+++ b/main/cel.c
@@ -1449,7 +1449,7 @@
 	}
 
 	cel_bridge_forwarder = stasis_forward_all(
-		ast_bridge_topic_all_cached(),
+		ast_bridge_topic_all(),
 		cel_aggregation_topic);
 	if (!cel_bridge_forwarder) {
 		return -1;
diff --git a/main/manager_bridges.c b/main/manager_bridges.c
index 4f2cb35..d49b783 100644
--- a/main/manager_bridges.c
+++ b/main/manager_bridges.c
@@ -330,22 +330,15 @@
 				    struct stasis_message *message)
 {
 	RAII_VAR(struct ast_str *, bridge_event_string, NULL, ast_free);
-	struct stasis_cache_update *update;
-	struct ast_bridge_snapshot *old_snapshot;
-	struct ast_bridge_snapshot *new_snapshot;
+	struct ast_bridge_snapshot_update *update;
 	size_t i;
 
 	update = stasis_message_data(message);
 
-	ast_assert(ast_bridge_snapshot_type() == update->type);
-
-	old_snapshot = stasis_message_data(update->old_snapshot);
-	new_snapshot = stasis_message_data(update->new_snapshot);
-
 	for (i = 0; i < ARRAY_LEN(bridge_monitors); ++i) {
 		RAII_VAR(struct ast_manager_event_blob *, event, NULL, ao2_cleanup);
 
-		event = bridge_monitors[i](old_snapshot, new_snapshot);
+		event = bridge_monitors[i](update->old_snapshot, update->new_snapshot);
 		if (!event) {
 			continue;
 		}
@@ -354,7 +347,7 @@
 		if (!bridge_event_string) {
 			bridge_event_string =
 				ast_manager_build_bridge_state_string(
-					new_snapshot ? new_snapshot : old_snapshot);
+					update->new_snapshot ? update->new_snapshot : update->old_snapshot);
 			if (!bridge_event_string) {
 				return;
 			}
@@ -446,26 +439,30 @@
 		ast_str_buffer(channel_text));
 }
 
-static int filter_bridge_type_cb(void *obj, void *arg, int flags)
-{
-	char *bridge_type = arg;
-	struct ast_bridge_snapshot *snapshot = stasis_message_data(obj);
-	/* unlink all the snapshots that do not match the bridge type */
-	return strcmp(bridge_type, snapshot->technology) ? CMP_MATCH : 0;
-}
-
 struct bridge_list_data {
-	const char *id_text;
+	struct ast_str *id_text;
+	const char *type_filter;
 	int count;
 };
 
 static int send_bridge_list_item_cb(void *obj, void *arg, void *data, int flags)
 {
-	struct ast_bridge_snapshot *snapshot = stasis_message_data(obj);
+	struct ast_bridge *bridge = obj;
+	RAII_VAR(struct ast_bridge_snapshot *, snapshot, ast_bridge_get_snapshot(bridge), ao2_cleanup);
 	struct mansession *s = arg;
 	struct bridge_list_data *list_data = data;
-	RAII_VAR(struct ast_str *, bridge_info, ast_manager_build_bridge_state_string(snapshot), ast_free);
+	struct ast_str * bridge_info;
 
+	if (!snapshot) {
+		return 0;
+	}
+
+	if (!ast_strlen_zero(list_data->type_filter)
+		&& strcmp(list_data->type_filter, snapshot->technology)) {
+		return 0;
+	}
+
+	bridge_info = ast_manager_build_bridge_state_string(snapshot);
 	if (!bridge_info) {
 		return 0;
 	}
@@ -475,9 +472,12 @@
 		"%s"
 		"%s"
 		"\r\n",
-		list_data->id_text,
+		ast_str_buffer(list_data->id_text),
 		ast_str_buffer(bridge_info));
 	++list_data->count;
+
+	ast_free(bridge_info);
+
 	return 0;
 }
 
@@ -485,41 +485,37 @@
 {
 	const char *id = astman_get_header(m, "ActionID");
 	const char *type_filter = astman_get_header(m, "BridgeType");
-	RAII_VAR(struct ast_str *, id_text, ast_str_create(128), ast_free);
-	RAII_VAR(struct ao2_container *, bridges, NULL, ao2_cleanup);
-	struct bridge_list_data list_data;
+	struct ao2_container *bridges;
+	struct bridge_list_data list_data = { 0 };
 
-	if (!id_text) {
-		astman_send_error(s, m, "Internal error");
-		return -1;
-	}
-
-	if (!ast_strlen_zero(id)) {
-		ast_str_set(&id_text, 0, "ActionID: %s\r\n", id);
-	}
-
-	bridges = stasis_cache_dump(ast_bridge_cache(), ast_bridge_snapshot_type());
+	bridges = ast_bridges();
 	if (!bridges) {
 		astman_send_error(s, m, "Internal error");
 		return -1;
 	}
 
-	astman_send_listack(s, m, "Bridge listing will follow", "start");
-
-	if (!ast_strlen_zero(type_filter)) {
-		char *type_filter_dup = ast_strdupa(type_filter);
-
-		ao2_callback(bridges, OBJ_MULTIPLE | OBJ_NODATA | OBJ_UNLINK,
-			filter_bridge_type_cb, type_filter_dup);
+	list_data.id_text = ast_str_create(128);
+	if (!list_data.id_text) {
+		ao2_ref(bridges, -1);
+		astman_send_error(s, m, "Internal error");
+		return -1;
 	}
 
-	list_data.id_text = ast_str_buffer(id_text);
-	list_data.count = 0;
+	if (!ast_strlen_zero(id)) {
+		ast_str_set(&list_data.id_text, 0, "ActionID: %s\r\n", id);
+	}
+	list_data.type_filter = type_filter;
+
+	astman_send_listack(s, m, "Bridge listing will follow", "start");
+
 	ao2_callback_data(bridges, OBJ_NODATA, send_bridge_list_item_cb, s, &list_data);
 
 	astman_send_list_complete_start(s, m, "BridgeListComplete", list_data.count);
 	astman_send_list_complete_end(s);
 
+	ast_free(list_data.id_text);
+	ao2_ref(bridges, -1);
+
 	return 0;
 }
 
@@ -550,7 +546,7 @@
 		"%s"
 		"%s"
 		"\r\n",
-		list_data->id_text,
+		ast_str_buffer(list_data->id_text),
 		ast_str_buffer(channel_text));
 	++list_data->count;
 	return 0;
@@ -560,43 +556,39 @@
 {
 	const char *id = astman_get_header(m, "ActionID");
 	const char *bridge_uniqueid = astman_get_header(m, "BridgeUniqueid");
-	RAII_VAR(struct ast_str *, id_text, ast_str_create(128), ast_free);
-	RAII_VAR(struct stasis_message *, msg, NULL, ao2_cleanup);
 	RAII_VAR(struct ast_str *, bridge_info, NULL, ast_free);
-	struct ast_bridge_snapshot *snapshot;
-	struct bridge_list_data list_data;
-
-	if (!id_text) {
-		astman_send_error(s, m, "Internal error");
-		return -1;
-	}
+	RAII_VAR(struct ast_bridge_snapshot *, snapshot, NULL, ao2_cleanup);
+	struct bridge_list_data list_data = { 0 };
 
 	if (ast_strlen_zero(bridge_uniqueid)) {
 		astman_send_error(s, m, "BridgeUniqueid must be provided");
 		return 0;
 	}
 
-	if (!ast_strlen_zero(id)) {
-		ast_str_set(&id_text, 0, "ActionID: %s\r\n", id);
-	}
-
-	msg = stasis_cache_get(ast_bridge_cache(), ast_bridge_snapshot_type(), bridge_uniqueid);
-	if (!msg) {
+	snapshot = ast_bridge_get_snapshot_by_uniqueid(bridge_uniqueid);
+	if (!snapshot) {
 		astman_send_error(s, m, "Specified BridgeUniqueid not found");
 		return 0;
 	}
 
-	snapshot = stasis_message_data(msg);
 	bridge_info = ast_manager_build_bridge_state_string(snapshot);
 	if (!bridge_info) {
 		astman_send_error(s, m, "Internal error");
 		return -1;
 	}
 
+	list_data.id_text = ast_str_create(128);
+	if (!list_data.id_text) {
+		astman_send_error(s, m, "Internal error");
+		return -1;
+	}
+
+	if (!ast_strlen_zero(id)) {
+		ast_str_set(&list_data.id_text, 0, "ActionID: %s\r\n", id);
+	}
+
 	astman_send_listack(s, m, "Bridge channel listing will follow", "start");
 
-	list_data.id_text = ast_str_buffer(id_text);
-	list_data.count = 0;
 	ao2_callback_data(snapshot->channels, OBJ_NODATA, send_bridge_info_item_cb, s, &list_data);
 
 	astman_send_list_complete_start(s, m, "BridgeInfoComplete", list_data.count);
@@ -604,6 +596,7 @@
 		astman_append(s, "%s", ast_str_buffer(bridge_info));
 	}
 	astman_send_list_complete_end(s);
+	ast_free(list_data.id_text);
 
 	return 0;
 }
@@ -703,7 +696,7 @@
 		return -1;
 	}
 
-	bridge_topic = ast_bridge_topic_all_cached();
+	bridge_topic = ast_bridge_topic_all();
 	if (!bridge_topic) {
 		return -1;
 	}
@@ -718,7 +711,7 @@
 		return -1;
 	}
 
-	ret |= stasis_message_router_add_cache_update(bridge_state_router,
+	ret |= stasis_message_router_add(bridge_state_router,
 		ast_bridge_snapshot_type(), bridge_snapshot_update, NULL);
 
 	ret |= stasis_message_router_add(bridge_state_router,
diff --git a/main/stasis_bridges.c b/main/stasis_bridges.c
index 42bf6bc..bed28ba 100644
--- a/main/stasis_bridges.c
+++ b/main/stasis_bridges.c
@@ -155,7 +155,8 @@
 	struct stasis_message *msg,
 	const struct stasis_message_sanitizer *sanitize);
 
-static struct stasis_cp_all *bridge_cache_all;
+static struct stasis_topic *bridge_topic_all;
+static struct stasis_topic_pool *bridge_topic_pool;
 
 /*!
  * @{ \brief Define bridge message types.
@@ -175,33 +176,9 @@
 	.to_ami = attended_transfer_to_ami);
 /*! @} */
 
-struct stasis_cache *ast_bridge_cache(void)
-{
-	return stasis_cp_all_cache(bridge_cache_all);
-}
-
 struct stasis_topic *ast_bridge_topic_all(void)
 {
-	return stasis_cp_all_topic(bridge_cache_all);
-}
-
-struct stasis_topic *ast_bridge_topic_all_cached(void)
-{
-	return stasis_cp_all_topic_cached(bridge_cache_all);
-}
-
-int bridge_topics_init(struct ast_bridge *bridge)
-{
-	if (ast_strlen_zero(bridge->uniqueid)) {
-		ast_log(LOG_ERROR, "Bridge id initialization required\n");
-		return -1;
-	}
-	bridge->topics = stasis_cp_single_create(bridge_cache_all,
-		bridge->uniqueid);
-	if (!bridge->topics) {
-		return -1;
-	}
-	return 0;
+	return bridge_topic_all;
 }
 
 struct stasis_topic *ast_bridge_topic(struct ast_bridge *bridge)
@@ -210,16 +187,7 @@
 		return ast_bridge_topic_all();
 	}
 
-	return stasis_cp_single_topic(bridge->topics);
-}
-
-struct stasis_topic *ast_bridge_topic_cached(struct ast_bridge *bridge)
-{
-	if (!bridge) {
-		return ast_bridge_topic_all_cached();
-	}
-
-	return stasis_cp_single_topic_cached(bridge->topics);
+	return bridge->topic;
 }
 
 /*! \brief Destructor for bridge snapshots */
@@ -292,24 +260,106 @@
 	return snapshot;
 }
 
-void ast_bridge_publish_state(struct ast_bridge *bridge)
+static void bridge_snapshot_update_dtor(void *obj)
 {
-	struct ast_bridge_snapshot *snapshot;
-	struct stasis_message *msg;
+	struct ast_bridge_snapshot_update *update = obj;
 
-	if (!ast_bridge_snapshot_type()) {
-		return;
+	ast_debug(3, "Update: %p  Old: %s  New: %s\n", update,
+		update->old_snapshot ? update->old_snapshot->uniqueid : "<none>",
+		update->new_snapshot ? update->new_snapshot->uniqueid : "<none>");
+	ao2_cleanup(update->old_snapshot);
+	ao2_cleanup(update->new_snapshot);
+}
+
+static struct ast_bridge_snapshot_update *bridge_snapshot_update_create(
+	struct ast_bridge_snapshot *old, struct ast_bridge_snapshot *new)
+{
+	struct ast_bridge_snapshot_update *update;
+
+	update = ao2_alloc_options(sizeof(*update), bridge_snapshot_update_dtor,
+			AO2_ALLOC_OPT_LOCK_NOLOCK);
+	if (!update) {
+		return NULL;
 	}
+	update->old_snapshot = ao2_bump(old);
+	update->new_snapshot = ao2_bump(new);
+
+	ast_debug(3, "Update: %p  Old: %s  New: %s\n", update,
+		update->old_snapshot ? update->old_snapshot->uniqueid : "<none>",
+		update->new_snapshot ? update->new_snapshot->uniqueid : "<none>");
+
+	return update;
+}
+
+int bridge_topics_init(struct ast_bridge *bridge)
+{
+	if (ast_strlen_zero(bridge->uniqueid)) {
+		ast_log(LOG_ERROR, "Bridge id initialization required\n");
+		return -1;
+	}
+
+	bridge->topic = stasis_topic_pool_get_topic(bridge_topic_pool, bridge->uniqueid);
+	if (!bridge->topic) {
+		return -1;
+	}
+
+	return 0;
+}
+
+void bridge_topics_destroy(struct ast_bridge *bridge)
+{
+	struct ast_bridge_snapshot_update *update;
+	struct stasis_message *msg;
 
 	ast_assert(bridge != NULL);
 
-	snapshot = ast_bridge_snapshot_create(bridge);
-	if (!snapshot) {
+	if (!bridge->current_snapshot) {
+		bridge->current_snapshot = ast_bridge_snapshot_create(bridge);
+		if (!bridge->current_snapshot) {
+			return;
+		}
+	}
+
+	update = bridge_snapshot_update_create(bridge->current_snapshot, NULL);
+	if (!update) {
 		return;
 	}
 
-	msg = stasis_message_create(ast_bridge_snapshot_type(), snapshot);
-	ao2_ref(snapshot, -1);
+	msg = stasis_message_create(ast_bridge_snapshot_type(), update);
+	ao2_ref(update, -1);
+	if (!msg) {
+		return;
+	}
+
+	stasis_publish(ast_bridge_topic(bridge), msg);
+	ao2_ref(msg, -1);
+
+	stasis_topic_pool_delete_topic(bridge_topic_pool, stasis_topic_name(ast_bridge_topic(bridge)));
+}
+
+void ast_bridge_publish_state(struct ast_bridge *bridge)
+{
+	struct ast_bridge_snapshot *new_snapshot;
+	struct ast_bridge_snapshot_update *update;
+	struct stasis_message *msg;
+
+	ast_assert(bridge != NULL);
+
+	new_snapshot = ast_bridge_snapshot_create(bridge);
+	if (!new_snapshot) {
+		return;
+	}
+
+	update = bridge_snapshot_update_create(bridge->current_snapshot, new_snapshot);
+	/* There may not have been an old snapshot */
+	ao2_cleanup(bridge->current_snapshot);
+	bridge->current_snapshot = new_snapshot;
+	if (!update) {
+		return;
+	}
+
+	msg = stasis_message_create(ast_bridge_snapshot_type(), update);
+	ao2_ref(update, -1);
 	if (!msg) {
 		return;
 	}
@@ -321,11 +371,20 @@
 static void bridge_publish_state_from_blob(struct ast_bridge *bridge,
 	struct ast_bridge_blob *obj)
 {
+	struct ast_bridge_snapshot_update *update;
 	struct stasis_message *msg;
 
 	ast_assert(obj != NULL);
 
-	msg = stasis_message_create(ast_bridge_snapshot_type(), obj->bridge);
+	update = bridge_snapshot_update_create(bridge->current_snapshot, obj->bridge);
+	ao2_cleanup(bridge->current_snapshot);
+	bridge->current_snapshot = ao2_bump(obj->bridge);
+	if (!update) {
+		return;
+	}
+
+	msg = stasis_message_create(ast_bridge_snapshot_type(), update);
+	ao2_ref(update, -1);
 	if (!msg) {
 		return;
 	}
@@ -1250,35 +1309,37 @@
 	ao2_ref(msg, -1);
 }
 
-struct ast_bridge_snapshot *ast_bridge_snapshot_get_latest(const char *uniqueid)
+struct ast_bridge_snapshot *ast_bridge_get_snapshot_by_uniqueid(const char *uniqueid)
 {
-	struct stasis_message *message;
+	struct ast_bridge *bridge;
 	struct ast_bridge_snapshot *snapshot;
 
 	ast_assert(!ast_strlen_zero(uniqueid));
 
-	message = stasis_cache_get(ast_bridge_cache(),
-			ast_bridge_snapshot_type(),
-			uniqueid);
-	if (!message) {
+	bridge = ast_bridge_find_by_id(uniqueid);
+	if (!bridge) {
 		return NULL;
 	}
-
-	snapshot = ao2_bump(stasis_message_data(message));
-	ao2_ref(message, -1);
+	ast_bridge_lock(bridge);
+	snapshot = ao2_bump(bridge->current_snapshot);
+	ast_bridge_unlock(bridge);
+	ao2_ref(bridge, -1);
 
 	return snapshot;
 }
 
-/*! \brief snapshot ID getter for caching topic */
-static const char *bridge_snapshot_get_id(struct stasis_message *msg)
+struct ast_bridge_snapshot *ast_bridge_get_snapshot(struct ast_bridge *bridge)
 {
 	struct ast_bridge_snapshot *snapshot;
-	if (stasis_message_type(msg) != ast_bridge_snapshot_type()) {
+
+	if (!bridge) {
 		return NULL;
 	}
-	snapshot = stasis_message_data(msg);
-	return snapshot->uniqueid;
+	ast_bridge_lock(bridge);
+	snapshot = ao2_bump(bridge->current_snapshot);
+	ast_bridge_unlock(bridge);
+
+	return snapshot;
 }
 
 static void stasis_bridging_cleanup(void)
@@ -1290,8 +1351,10 @@
 	STASIS_MESSAGE_TYPE_CLEANUP(ast_blind_transfer_type);
 	STASIS_MESSAGE_TYPE_CLEANUP(ast_attended_transfer_type);
 
-	ao2_cleanup(bridge_cache_all);
-	bridge_cache_all = NULL;
+	ao2_cleanup(bridge_topic_pool);
+	bridge_topic_pool = NULL;
+	ao2_cleanup(bridge_topic_all);
+	bridge_topic_all = NULL;
 }
 
 int ast_stasis_bridging_init(void)
@@ -1300,10 +1363,12 @@
 
 	ast_register_cleanup(stasis_bridging_cleanup);
 
-	bridge_cache_all = stasis_cp_all_create("ast_bridge_topic_all",
-		bridge_snapshot_get_id);
-
-	if (!bridge_cache_all) {
+	bridge_topic_all = stasis_topic_create("ast_bridge_topic_all");
+	if (!bridge_topic_all) {
+		return -1;
+	}
+	bridge_topic_pool = stasis_topic_pool_create(bridge_topic_all);
+	if (!bridge_topic_pool) {
 		return -1;
 	}
 
diff --git a/res/ari/resource_bridges.c b/res/ari/resource_bridges.c
index 3c0eeb7..33e4cd1 100644
--- a/res/ari/resource_bridges.c
+++ b/res/ari/resource_bridges.c
@@ -65,7 +65,7 @@
 	bridge = stasis_app_bridge_find_by_id(bridge_id);
 	if (bridge == NULL) {
 		RAII_VAR(struct ast_bridge_snapshot *, snapshot,
-			ast_bridge_snapshot_get_latest(bridge_id), ao2_cleanup);
+			ast_bridge_get_snapshot_by_uniqueid(bridge_id), ao2_cleanup);
 		if (!snapshot) {
 			ast_ari_response_error(response, 404, "Not found",
 				"Bridge not found");
@@ -856,7 +856,7 @@
 	struct ast_ari_bridges_get_args *args,
 	struct ast_ari_response *response)
 {
-	RAII_VAR(struct ast_bridge_snapshot *, snapshot, ast_bridge_snapshot_get_latest(args->bridge_id), ao2_cleanup);
+	RAII_VAR(struct ast_bridge_snapshot *, snapshot, ast_bridge_get_snapshot_by_uniqueid(args->bridge_id), ao2_cleanup);
 	if (!snapshot) {
 		ast_ari_response_error(
 			response, 404, "Not Found",
@@ -885,23 +885,13 @@
 	struct ast_ari_bridges_list_args *args,
 	struct ast_ari_response *response)
 {
-	RAII_VAR(struct stasis_cache *, cache, NULL, ao2_cleanup);
-	RAII_VAR(struct ao2_container *, snapshots, NULL, ao2_cleanup);
+	RAII_VAR(struct ao2_container *, bridges, NULL, ao2_cleanup);
 	RAII_VAR(struct ast_json *, json, NULL, ast_json_unref);
 	struct ao2_iterator i;
-	void *obj;
+	struct ast_bridge *bridge;
 
-	cache = ast_bridge_cache();
-	if (!cache) {
-		ast_ari_response_error(
-			response, 500, "Internal Server Error",
-			"Message bus not initialized");
-		return;
-	}
-	ao2_ref(cache, +1);
-
-	snapshots = stasis_cache_dump(cache, ast_bridge_snapshot_type());
-	if (!snapshots) {
+	bridges = ast_bridges();
+	if (!bridges) {
 		ast_ari_response_alloc_failed(response);
 		return;
 	}
@@ -912,12 +902,14 @@
 		return;
 	}
 
-	i = ao2_iterator_init(snapshots, 0);
-	while ((obj = ao2_iterator_next(&i))) {
-		RAII_VAR(struct stasis_message *, msg, obj, ao2_cleanup);
-		struct ast_bridge_snapshot *snapshot = stasis_message_data(msg);
+	i = ao2_iterator_init(bridges, 0);
+	while ((bridge = ao2_iterator_next(&i))) {
+		struct ast_bridge_snapshot *snapshot = ast_bridge_get_snapshot(bridge);
+		/* ast_bridge_snapshot_to_json will return NULL if snapshot is NULL */
 		struct ast_json *json_bridge = ast_bridge_snapshot_to_json(snapshot, stasis_app_get_sanitizer());
 
+		ao2_ref(bridge, -1);
+		ao2_cleanup(snapshot);
 		if (!json_bridge || ast_json_array_append(json, json_bridge)) {
 			ao2_iterator_destroy(&i);
 			ast_ari_response_alloc_failed(response);
diff --git a/res/res_stasis.c b/res/res_stasis.c
index 43833e1..86723a1 100644
--- a/res/res_stasis.c
+++ b/res/res_stasis.c
@@ -1974,7 +1974,7 @@
 			have_channel = 1;
 		} else if (ast_begins_with(uri, "bridge:")) {
 			type = STASIS_UMOS_BRIDGE;
-			snapshot = ast_bridge_snapshot_get_latest(uri + 7);
+			snapshot = ast_bridge_get_snapshot_by_uniqueid(uri + 7);
 		} else if (ast_begins_with(uri, "endpoint:")) {
 			type = STASIS_UMOS_ENDPOINT;
 			snapshot = ast_endpoint_latest_snapshot(uri + 9, NULL);
diff --git a/res/stasis/app.c b/res/stasis/app.c
index 78f5765..eb49243 100644
--- a/res/stasis/app.c
+++ b/res/stasis/app.c
@@ -172,16 +172,9 @@
 	}
 
 	forwards->forward_type = FORWARD_BRIDGE;
-	if (bridge) {
-		forwards->topic_forward = stasis_forward_all(ast_bridge_topic(bridge),
-			app->topic);
-	}
-	forwards->topic_cached_forward = stasis_forward_all(
-		bridge ? ast_bridge_topic_cached(bridge) : ast_bridge_topic_all_cached(),
-		app->topic);
+	forwards->topic_forward = stasis_forward_all(ast_bridge_topic(bridge), app->topic);
 
-	if ((!forwards->topic_forward && bridge) || !forwards->topic_cached_forward) {
-		/* Half-subscribed is a bad thing */
+	if (!forwards->topic_forward && bridge) {
 		forwards_unsubscribe(forwards);
 		ao2_ref(forwards, -1);
 		return NULL;
@@ -666,33 +659,23 @@
 {
 	struct ast_json *json = NULL;
 	struct stasis_app *app = data;
-	struct stasis_cache_update *update;
-	struct ast_bridge_snapshot *new_snapshot;
-	struct ast_bridge_snapshot *old_snapshot;
+	struct ast_bridge_snapshot_update *update;
 	const struct timeval *tv;
 
-	ast_assert(stasis_message_type(message) == stasis_cache_update_type());
-
 	update = stasis_message_data(message);
 
-	ast_assert(update->type == ast_bridge_snapshot_type());
+	tv = stasis_message_timestamp(message);
 
-	new_snapshot = stasis_message_data(update->new_snapshot);
-	old_snapshot = stasis_message_data(update->old_snapshot);
-	tv = update->new_snapshot ?
-		stasis_message_timestamp(update->new_snapshot) :
-		stasis_message_timestamp(message);
-
-	if (!new_snapshot) {
-		json = simple_bridge_event("BridgeDestroyed", old_snapshot, tv);
-	} else if (!old_snapshot) {
-		json = simple_bridge_event("BridgeCreated", new_snapshot, tv);
-	} else if (new_snapshot && old_snapshot
-		&& strcmp(new_snapshot->video_source_id, old_snapshot->video_source_id)) {
-		json = simple_bridge_event("BridgeVideoSourceChanged", new_snapshot, tv);
-		if (json && !ast_strlen_zero(old_snapshot->video_source_id)) {
+	if (!update->new_snapshot) {
+		json = simple_bridge_event("BridgeDestroyed", update->old_snapshot, tv);
+	} else if (!update->old_snapshot) {
+		json = simple_bridge_event("BridgeCreated", update->new_snapshot, tv);
+	} else if (update->new_snapshot && update->old_snapshot
+		&& strcmp(update->new_snapshot->video_source_id, update->old_snapshot->video_source_id)) {
+		json = simple_bridge_event("BridgeVideoSourceChanged", update->new_snapshot, tv);
+		if (json && !ast_strlen_zero(update->old_snapshot->video_source_id)) {
 			ast_json_object_set(json, "old_video_source_id",
-				ast_json_string_create(old_snapshot->video_source_id));
+				ast_json_string_create(update->old_snapshot->video_source_id));
 		}
 	}
 
@@ -701,8 +684,8 @@
 		ast_json_unref(json);
 	}
 
-	if (!new_snapshot && old_snapshot) {
-		unsubscribe(app, "bridge", old_snapshot->uniqueid, 1);
+	if (!update->new_snapshot && update->old_snapshot) {
+		unsubscribe(app, "bridge", update->old_snapshot->uniqueid, 1);
 	}
 }
 
@@ -961,7 +944,7 @@
 		return NULL;
 	}
 
-	res |= stasis_message_router_add_cache_update(app->router,
+	res |= stasis_message_router_add(app->router,
 		ast_bridge_snapshot_type(), sub_bridge_update_handler, app);
 
 	res |= stasis_message_router_add(app->router,
diff --git a/tests/test_cel.c b/tests/test_cel.c
index 6c8bd61..902362d 100644
--- a/tests/test_cel.c
+++ b/tests/test_cel.c
@@ -351,7 +351,7 @@
 static struct ast_str *test_cel_generate_peer_str_snapshot(struct ast_channel_snapshot *chan, struct ast_bridge *bridge)
 {
 	RAII_VAR(struct ast_bridge_snapshot *, snapshot,
-		ast_bridge_snapshot_get_latest(bridge->uniqueid),
+		ast_bridge_get_snapshot(bridge),
 		ao2_cleanup);
 
 	if (!snapshot) {

-- 
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Gerrit-Project: asterisk
Gerrit-Branch: master
Gerrit-MessageType: merged
Gerrit-Change-Id: I7049b80efa88676ce5c4666f818fa18ad1985369
Gerrit-Change-Number: 10227
Gerrit-PatchSet: 7
Gerrit-Owner: George Joseph <gjoseph at digium.com>
Gerrit-Reviewer: Corey Farrell <git at cfware.com>
Gerrit-Reviewer: George Joseph <gjoseph at digium.com>
Gerrit-Reviewer: Jenkins2 (1000185)
Gerrit-Reviewer: Joshua Colp <jcolp at digium.com>
Gerrit-Reviewer: Kevin Harwell <kharwell at digium.com>
Gerrit-Reviewer: Richard Mudgett <rmudgett at digium.com>
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