Add channel events for res_stasis apps

This change adds a framework in res_stasis for handling events from
channel topics. JSON event generation and validation code is created
from event documentation in rest-api/api-docs/events.json to assist in
JSON event generation, ensure consistency, and ensure that accurate
documentation is available for ALL events that are received by
res_stasis applications.

The userevent application has been refactored along with the code that
handles userevent channel blob events to pass the headers as key/value
pairs in the JSON blob. As a side-effect, app_userevent now handles
duplicate keys by overwriting the previous value.

Review: https://reviewboard.asterisk.org/r/2428/
(closes issue ASTERISK-21180)
Patch-By: Kinsey Moore <kmoore@digium.com>


git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@388275 65c4cc65-6c06-0410-ace0-fbb531ad65f3

CHANGES

@@ -153,6 +153,12 @@ Sorcery
    column named "id" within their schema when using the Sorcery realtime module.
    This column must be able to contain a string of up to 128 characters in length.
 
+app_userevent
+------------------
+ * UserEvent will now handle duplicate keys by overwriting the previous value
+   assigned to the key. UserEvent invocations will also be distributed to any
+   interested res_stasis applications.
+
 ------------------------------------------------------------------------------
 --- Functionality changes from Asterisk 10 to Asterisk 11 --------------------
 ------------------------------------------------------------------------------

apps/app_userevent.c

@@ -39,23 +39,28 @@ ASTERISK_FILE_VERSION(__FILE__, "$Revision$")
 /*** DOCUMENTATION
 	<application name="UserEvent" language="en_US">
 		<synopsis>
-			Send an arbitrary event to the manager interface.
+			Send an arbitrary user-defined event to parties interested in a channel (AMI users and relevant res_stasis applications).
 		</synopsis>
 		<syntax>
 			<parameter name="eventname" required="true" />
 			<parameter name="body" />
 		</syntax>
 		<description>
-			<para>Sends an arbitrary event to the manager interface, with an optional
+			<para>Sends an arbitrary event to interested parties, with an optional
 			<replaceable>body</replaceable> representing additional arguments. The
 			<replaceable>body</replaceable> may be specified as
-			a <literal>,</literal> delimited list of headers. Each additional
-			argument will be placed on a new line in the event. The format of the
-			event will be:</para>
+			a <literal>,</literal> delimited list of key:value pairs.</para>
+			<para>For AMI, each additional argument will be placed on a new line in
+			the event and the format of the event will be:</para>
 			<para>    Event: UserEvent</para>
 			<para>    UserEvent: &lt;specified event name&gt;</para>
 			<para>    [body]</para>
-			<para>If no <replaceable>body</replaceable> is specified, only Event and UserEvent headers will be present.</para>
+			<para>If no <replaceable>body</replaceable> is specified, only Event and
+			UserEvent headers will be present.</para>
+			<para>For res_stasis applications, the event will be provided as a JSON
+			blob with additional arguments appearing as keys in the object and the
+			<replaceable>eventname</replaceable> under the
+			<literal>eventname</literal> key.</para>
 		</description>
 	</application>
  ***/
@@ -70,7 +75,6 @@ static int userevent_exec(struct ast_channel *chan, const char *data)
 		AST_APP_ARG(eventname);
 		AST_APP_ARG(extra)[100];
 	);
-	RAII_VAR(struct ast_str *, body, ast_str_create(16), ast_free);
 	RAII_VAR(struct ast_json *, blob, NULL, ast_json_unref);
 	RAII_VAR(struct stasis_message *, msg, NULL, ao2_cleanup);
 
@@ -79,27 +83,39 @@ static int userevent_exec(struct ast_channel *chan, const char *data)
 		return -1;
 	}
 
-	if (!body) {
-		ast_log(LOG_WARNING, "Unable to allocate buffer\n");
-		return -1;
-	}
-
 	parse = ast_strdupa(data);
 
 	AST_STANDARD_APP_ARGS(args, parse);
 
-	for (x = 0; x < args.argc - 1; x++) {
-		ast_str_append(&body, 0, "%s\r\n", args.extra[x]);
-	}
-
 	blob = ast_json_pack("{s: s, s: s}",
-			     "eventname", args.eventname,
-			     "body", ast_str_buffer(body));
+			     "type", "userevent",
+			     "eventname", args.eventname);
 	if (!blob) {
-		ast_log(LOG_WARNING, "Unable to create message buffer\n");
 		return -1;
 	}
 
+	for (x = 0; x < args.argc - 1; x++) {
+		char *key, *value = args.extra[x];
+		struct ast_json *json_value;
+
+		key = strsep(&value, ":");
+		if (!value) {
+			/* no ':' in string? */
+			continue;
+		}
+
+		value = ast_strip(value);
+		json_value = ast_json_string_create(value);
+		if (!json_value) {
+			return -1;
+		}
+
+		/* ref stolen by ast_json_object_set */
+		if (ast_json_object_set(blob, key, json_value)) {
+			return -1;
+		}
+	}
+
 	msg = ast_channel_blob_create(
 		chan, ast_channel_user_event_type(), blob);
 	if (!msg) {

include/asterisk/stasis_channels.h

@@ -306,6 +306,34 @@ void ast_channel_publish_dial(struct ast_channel *caller,
  */
 struct ast_json *ast_channel_snapshot_to_json(const struct ast_channel_snapshot *snapshot);
 
+/*!
+ * \brief Compares the context, exten and priority of two snapshots.
+ * \since 12
+ *
+ * \param old_snapshot Old snapshot
+ * \param new_snapshot New snapshot
+ *
+ * \return True (non-zero) if context, exten or priority are identical.
+ * \return False (zero) if context, exten and priority changed.
+ */
+int ast_channel_snapshot_cep_equal(
+	const struct ast_channel_snapshot *old_snapshot,
+	const struct ast_channel_snapshot *new_snapshot);
+
+/*!
+ * \brief Compares the callerid info of two snapshots.
+ * \since 12
+ *
+ * \param old_snapshot Old snapshot
+ * \param new_snapshot New snapshot
+ *
+ * \return True (non-zero) if callerid are identical.
+ * \return False (zero) if callerid changed.
+ */
+int ast_channel_snapshot_caller_id_equal(
+	const struct ast_channel_snapshot *old_snapshot,
+	const struct ast_channel_snapshot *new_snapshot);
+
 /*!
  * \brief Dispose of the stasis channel topics and message types
  */

main/manager_channels.c

@@ -402,34 +402,6 @@ static struct snapshot_manager_event *channel_state_change(
 	return NULL;
 }
 
-/*!
- * \brief Compares the context, exten and priority of two snapshots.
- * \param old_snapshot Old snapshot
- * \param new_snapshot New snapshot
- * \return True (non-zero) if context, exten or priority are identical.
- * \return False (zero) if context, exten and priority changed.
- */
-static inline int cep_equal(
-	const struct ast_channel_snapshot *old_snapshot,
-	const struct ast_channel_snapshot *new_snapshot)
-{
-	ast_assert(old_snapshot != NULL);
-	ast_assert(new_snapshot != NULL);
-
-	/* We actually get some snapshots with CEP set, but before the
-	 * application is set. Since empty application is invalid, we treat
-	 * setting the application from nothing as a CEP change.
-	 */
-	if (ast_strlen_zero(old_snapshot->appl) &&
-	    !ast_strlen_zero(new_snapshot->appl)) {
-		return 0;
-	}
-
-	return old_snapshot->priority == new_snapshot->priority &&
-		strcmp(old_snapshot->context, new_snapshot->context) == 0 &&
-		strcmp(old_snapshot->exten, new_snapshot->exten) == 0;
-}
-
 static struct snapshot_manager_event *channel_newexten(
 	struct ast_channel_snapshot *old_snapshot,
 	struct ast_channel_snapshot *new_snapshot)
@@ -444,7 +416,7 @@ static struct snapshot_manager_event *channel_newexten(
 		return NULL;
 	}
 
-	if (old_snapshot && cep_equal(old_snapshot, new_snapshot)) {
+	if (old_snapshot && ast_channel_snapshot_cep_equal(old_snapshot, new_snapshot)) {
 		return NULL;
 	}
 
@@ -459,23 +431,6 @@ static struct snapshot_manager_event *channel_newexten(
 		new_snapshot->data);
 }
 
-/*!
- * \brief Compares the callerid info of two snapshots.
- * \param old_snapshot Old snapshot
- * \param new_snapshot New snapshot
- * \return True (non-zero) if callerid are identical.
- * \return False (zero) if callerid changed.
- */
-static inline int caller_id_equal(
-	const struct ast_channel_snapshot *old_snapshot,
-	const struct ast_channel_snapshot *new_snapshot)
-{
-	ast_assert(old_snapshot != NULL);
-	ast_assert(new_snapshot != NULL);
-	return strcmp(old_snapshot->caller_number, new_snapshot->caller_number) == 0 &&
-		strcmp(old_snapshot->caller_name, new_snapshot->caller_name) == 0;
-}
-
 static struct snapshot_manager_event *channel_new_callerid(
 	struct ast_channel_snapshot *old_snapshot,
 	struct ast_channel_snapshot *new_snapshot)
@@ -485,7 +440,7 @@ static struct snapshot_manager_event *channel_new_callerid(
 		return NULL;
 	}
 
-	if (caller_id_equal(old_snapshot, new_snapshot)) {
+	if (ast_channel_snapshot_caller_id_equal(old_snapshot, new_snapshot)) {
 		return NULL;
 	}
 
@@ -587,19 +542,62 @@ static void channel_varset_cb(void *data, struct stasis_subscription *sub,
 		      variable, value);
 }
 
+/*!
+ * \brief Callback used to determine whether a key should be skipped when converting a JSON object to a manager blob
+ * \param key Key from JSON blob to be evaluated
+ * \retval non-zero if the key should be excluded
+ * \retval zero if the key should not be excluded
+ */
+typedef int (*key_exclusion_cb)(const char *key);
+
+static struct ast_str *manager_str_from_json_object(struct ast_json *blob, key_exclusion_cb exclusion_cb)
+{
+	struct ast_str *output_str = ast_str_create(32);
+	struct ast_json_iter *blob_iter = ast_json_object_iter(blob);
+	if (!output_str || !blob_iter) {
+		return NULL;
+	}
+
+	do {
+		const char *key = ast_json_object_iter_key(blob_iter);
+		const char *value = ast_json_string_get(ast_json_object_iter_value(blob_iter));
+		if (exclusion_cb && exclusion_cb(key)) {
+			continue;
+		}
+
+		ast_str_append(&output_str, 0, "%s: %s\r\n", key, value);
+		if (!output_str) {
+			return NULL;
+		}
+	} while ((blob_iter = ast_json_object_iter_next(blob, blob_iter)));
+
+	return output_str;
+}
+
+static int userevent_exclusion_cb(const char *key)
+{
+	if (!strcmp("type", key)) {
+		return 1;
+	}
+	if (!strcmp("eventname", key)) {
+		return 1;
+	}
+	return 0;
+}
+
 static void channel_user_event_cb(void *data, struct stasis_subscription *sub,
 	struct stasis_topic *topic, struct stasis_message *message)
 {
 	struct ast_channel_blob *obj = stasis_message_data(message);
 	RAII_VAR(struct ast_str *, channel_event_string, NULL, ast_free);
+	RAII_VAR(struct ast_str *, body, NULL, ast_free);
 	const char *eventname;
-	const char *body;
 
 	eventname = ast_json_string_get(ast_json_object_get(obj->blob, "eventname"));
-	body = ast_json_string_get(ast_json_object_get(obj->blob, "body"));
+	body = manager_str_from_json_object(obj->blob, userevent_exclusion_cb);
 	channel_event_string = ast_manager_build_channel_state_string(obj->snapshot);
 
-	if (!channel_event_string) {
+	if (!channel_event_string || !body) {
 		return;
 	}
 
@@ -621,7 +619,7 @@ static void channel_user_event_cb(void *data, struct stasis_subscription *sub,
 		      "%s"
 		      "UserEvent: %s\r\n"
 		      "%s",
-		      ast_str_buffer(channel_event_string), eventname, body);
+		      ast_str_buffer(channel_event_string), eventname, ast_str_buffer(body));
 }
 
 static void channel_hangup_request_cb(void *data,

main/stasis_channels.c

@@ -448,6 +448,37 @@ struct ast_json *ast_channel_snapshot_to_json(const struct ast_channel_snapshot
 	return ast_json_ref(json_chan);
 }
 
+int ast_channel_snapshot_cep_equal(
+	const struct ast_channel_snapshot *old_snapshot,
+	const struct ast_channel_snapshot *new_snapshot)
+{
+	ast_assert(old_snapshot != NULL);
+	ast_assert(new_snapshot != NULL);
+
+	/* We actually get some snapshots with CEP set, but before the
+	 * application is set. Since empty application is invalid, we treat
+	 * setting the application from nothing as a CEP change.
+	 */
+	if (ast_strlen_zero(old_snapshot->appl) &&
+	    !ast_strlen_zero(new_snapshot->appl)) {
+		return 0;
+	}
+
+	return old_snapshot->priority == new_snapshot->priority &&
+		strcmp(old_snapshot->context, new_snapshot->context) == 0 &&
+		strcmp(old_snapshot->exten, new_snapshot->exten) == 0;
+}
+
+int ast_channel_snapshot_caller_id_equal(
+	const struct ast_channel_snapshot *old_snapshot,
+	const struct ast_channel_snapshot *new_snapshot)
+{
+	ast_assert(old_snapshot != NULL);
+	ast_assert(new_snapshot != NULL);
+	return strcmp(old_snapshot->caller_number, new_snapshot->caller_number) == 0 &&
+		strcmp(old_snapshot->caller_name, new_snapshot->caller_name) == 0;
+}
+
 void ast_stasis_channels_shutdown(void)
 {
 	STASIS_MESSAGE_TYPE_CLEANUP(ast_channel_snapshot_type);

res/res_stasis.c

@@ -39,6 +39,9 @@ ASTERISK_FILE_VERSION(__FILE__, "$Revision$")
 #include "asterisk/stasis_app.h"
 #include "asterisk/stasis_channels.h"
 #include "asterisk/strings.h"
+#include "asterisk/stasis_message_router.h"
+#include "asterisk/callerid.h"
+#include "stasis_http/resource_events.h"
 
 /*! Time to wait for a frame in the application */
 #define MAX_WAIT_MS 200
@@ -55,6 +58,18 @@ ASTERISK_FILE_VERSION(__FILE__, "$Revision$")
  */
 #define CONTROLS_NUM_BUCKETS 127
 
+/*!
+ * \brief Number of buckets for the channels container for app instances.  Remember
+ * to keep it a prime number!
+ */
+#define APP_CHANNELS_BUCKETS 7
+
+/*!
+ * \brief Number of buckets for the blob_handlers container.  Remember to keep
+ * it a prime number!
+ */
+#define BLOB_HANDLER_BUCKETS 7
+
 /*!
  * \brief Stasis application container. Please call apps_registry() instead of
  * directly accessing.
@@ -63,6 +78,9 @@ struct ao2_container *__apps_registry;
 
 struct ao2_container *__app_controls;
 
+/*! \brief Message router for the channel caching topic */
+struct stasis_message_router *channel_router;
+
 /*! Ref-counting accessor for the stasis applications container */
 static struct ao2_container *apps_registry(void)
 {
@@ -81,6 +99,8 @@ struct app {
 	stasis_app_cb handler;
 	/*! Opaque data to hand to callback function. */
 	void *data;
+	/*! List of channel identifiers this app instance is interested in */
+	struct ao2_container *channels;
 	/*! Name of the Stasis application */
 	char name[];
 };
@@ -91,12 +111,14 @@ static void app_dtor(void *obj)
 
 	ao2_cleanup(app->data);
 	app->data = NULL;
+	ao2_cleanup(app->channels);
+	app->channels = NULL;
 }
 
 /*! Constructor for \ref app. */
 static struct app *app_create(const char *name, stasis_app_cb handler, void *data)
 {
-	struct app *app;
+	RAII_VAR(struct app *, app, NULL, ao2_cleanup);
 	size_t size;
 
 	ast_assert(name != NULL);
@@ -114,6 +136,12 @@ static struct app *app_create(const char *name, stasis_app_cb handler, void *dat
 	ao2_ref(data, +1);
 	app->data = data;
 
+	app->channels = ast_str_container_alloc(APP_CHANNELS_BUCKETS);
+	if (!app->channels) {
+		return NULL;
+	}
+
+	ao2_ref(app, +1);
 	return app;
 }
 
@@ -140,6 +168,27 @@ static int app_compare(void *lhs, void *rhs, int flags)
 	}
 }
 
+static int app_add_channel(struct app* app, const struct ast_channel *chan)
+{
+	const char *uniqueid;
+	ast_assert(chan != NULL);
+	ast_assert(app != NULL);
+
+	uniqueid = ast_channel_uniqueid(chan);
+	if (!ast_str_container_add(app->channels, uniqueid)) {
+		return -1;
+	}
+	return 0;
+}
+
+static void app_remove_channel(struct app* app, const struct ast_channel *chan)
+{
+	ast_assert(chan != NULL);
+	ast_assert(app != NULL);
+
+	ao2_find(app->channels, ast_channel_uniqueid(chan), OBJ_KEY | OBJ_NODATA | OBJ_UNLINK);
+}
+
 /*!
  * \brief Send a message to the given application.
  * \param app App to send the message to.
@@ -316,6 +365,9 @@ void stasis_app_control_continue(struct stasis_app_control *control)
 	control->continue_to_dialplan = 1;
 }
 
+/*! \brief Typedef for blob handler callbacks */
+typedef struct ast_json *(*channel_blob_handler_cb)(struct ast_channel_blob *);
+
 static int OK = 0;
 static int FAIL = -1;
 
@@ -343,43 +395,11 @@ int stasis_app_control_answer(struct stasis_app_control *control)
 	return *retval;
 }
 
-static struct ast_json *app_event_create(
-	const char *event_name,
-	const struct ast_channel_snapshot *snapshot,
-	const struct ast_json *extra_info)
-{
-	RAII_VAR(struct ast_json *, message, NULL, ast_json_unref);
-	RAII_VAR(struct ast_json *, event, NULL, ast_json_unref);
-
-	if (extra_info) {
-		event = ast_json_deep_copy(extra_info);
-	} else {
-		event = ast_json_object_create();
-	}
-
-	if (snapshot) {
-		int ret;
-
-		/* Mustn't already have a channel field */
-		ast_assert(ast_json_object_get(event, "channel") == NULL);
-
-		ret = ast_json_object_set(
-			event,
-			"channel", ast_channel_snapshot_to_json(snapshot));
-		if (ret != 0) {
-			return NULL;
-		}
-	}
-
-	message = ast_json_pack("{s: o}", event_name, ast_json_ref(event));
-
-	return ast_json_ref(message);
-}
-
 static int send_start_msg(struct app *app, struct ast_channel *chan,
 			  int argc, char *argv[])
 {
 	RAII_VAR(struct ast_json *, msg, NULL, ast_json_unref);
+	RAII_VAR(struct ast_json *, blob, NULL, ast_json_unref);
 	RAII_VAR(struct ast_channel_snapshot *, snapshot, NULL, ao2_cleanup);
 
 	struct ast_json *json_args;
@@ -393,19 +413,13 @@ static int send_start_msg(struct app *app, struct ast_channel *chan,
 		return -1;
 	}
 
-	msg = ast_json_pack("{s: {s: [], s: o}}",
-			    "stasis-start",
-			    "args",
-			    "channel", ast_channel_snapshot_to_json(snapshot));
-
-	if (!msg) {
+	blob = ast_json_pack("{s: []}", "args");
+	if (!blob) {
 		return -1;
 	}
 
 	/* Append arguments to args array */
-	json_args = ast_json_object_get(
-		ast_json_object_get(msg, "stasis-start"),
-		"args");
+	json_args = ast_json_object_get(blob, "args");
 	ast_assert(json_args != NULL);
 	for (i = 0; i < argc; ++i) {
 		int r = ast_json_array_append(json_args,
@@ -416,6 +430,11 @@ static int send_start_msg(struct app *app, struct ast_channel *chan,
 		}
 	}
 
+	msg = stasis_json_event_stasis_start_create(snapshot, blob);
+	if (!msg) {
+		return -1;
+	}
+
 	app_send(app, msg);
 	return 0;
 }
@@ -432,7 +451,8 @@ static int send_end_msg(struct app *app, struct ast_channel *chan)
 	if (snapshot == NULL) {
 		return -1;
 	}
-	msg = app_event_create("stasis-end", snapshot, NULL);
+
+	msg = stasis_json_event_stasis_end_create(snapshot);
 	if (!msg) {
 		return -1;
 	}
@@ -441,62 +461,201 @@ static int send_end_msg(struct app *app, struct ast_channel *chan)
 	return 0;
 }
 
-static void dtmf_handler(struct app *app, struct ast_channel_blob *obj)
+static int app_watching_channel_cb(void *obj, void *arg, int flags)
 {
-	RAII_VAR(struct ast_json *, extra, NULL, ast_json_unref);
-	RAII_VAR(struct ast_json *, msg, NULL, ast_json_unref);
-	const char *direction;
+	RAII_VAR(char *, uniqueid, NULL, ao2_cleanup);
+	struct app *app = obj;
+	char *chan_uniqueid = arg;
 
-	/* To simplify events, we'll only generate on receive */
-	direction = ast_json_string_get(
-		ast_json_object_get(obj->blob, "direction"));
+	uniqueid = ao2_find(app->channels, chan_uniqueid, OBJ_KEY);
+	return uniqueid ? CMP_MATCH : 0;
+}
 
-	if (strcmp("Received", direction) != 0) {
-		return;
+static struct ao2_container *get_watching_apps(const char *uniqueid)
+{
+	RAII_VAR(struct ao2_container *, apps, apps_registry(), ao2_cleanup);
+	struct ao2_container *watching_apps;
+	char *uniqueid_dup;
+	RAII_VAR(struct ao2_iterator *,watching_apps_iter, NULL, ao2_iterator_destroy);
+	ast_assert(uniqueid != NULL);
+	ast_assert(apps != NULL);
+
+	uniqueid_dup = ast_strdupa(uniqueid);
+
+	watching_apps_iter = ao2_callback(apps, OBJ_MULTIPLE, app_watching_channel_cb, uniqueid_dup);
+	watching_apps = watching_apps_iter->c;
+
+	if (!ao2_container_count(watching_apps)) {
+		return NULL;
 	}
 
-	extra = ast_json_pack(
-		"{s: o}",
-		"digit", ast_json_ref(ast_json_object_get(obj->blob, "digit")));
-	if (!extra) {
-		return;
+	ao2_ref(watching_apps, +1);
+	return watching_apps_iter->c;
+}
+
+/*! \brief Typedef for callbacks that get called on channel snapshot updates */
+typedef struct ast_json *(*channel_snapshot_monitor)(
+	struct ast_channel_snapshot *old_snapshot,
+	struct ast_channel_snapshot *new_snapshot);
+
+/*! \brief Handle channel state changes */
+static struct ast_json *channel_state(
+	struct ast_channel_snapshot *old_snapshot,
+	struct ast_channel_snapshot *new_snapshot)
+{
+	RAII_VAR(struct ast_json *, json, NULL, ast_json_unref);
+	struct ast_channel_snapshot *snapshot = new_snapshot ? new_snapshot : old_snapshot;
+
+	if (!old_snapshot) {
+		return stasis_json_event_channel_created_create(snapshot);
+	} else if (!new_snapshot) {
+		json = ast_json_pack("{s: i, s: s}",
+			"cause", snapshot->hangupcause,
+			"cause_txt", ast_cause2str(snapshot->hangupcause));
+		if (!json) {
+			return NULL;
+		}
+		return stasis_json_event_channel_destroyed_create(snapshot, json);
+	} else if (old_snapshot->state != new_snapshot->state) {
+		return stasis_json_event_channel_state_change_create(snapshot);
 	}
 
-	msg = app_event_create("dtmf-received", obj->snapshot, extra);
-	if (!msg) {
-		return;
+	return NULL;
+}
+
+static struct ast_json *channel_dialplan(
+	struct ast_channel_snapshot *old_snapshot,
+	struct ast_channel_snapshot *new_snapshot)
+{
+	RAII_VAR(struct ast_json *, json, NULL, ast_json_unref);
+
+	/* No Newexten event on cache clear */
+	if (!new_snapshot) {
+		return NULL;
+	}
+
+	/* Empty application is not valid for a Newexten event */
+	if (ast_strlen_zero(new_snapshot->appl)) {
+		return NULL;
+	}
+
+	if (old_snapshot && ast_channel_snapshot_cep_equal(old_snapshot, new_snapshot)) {
+		return NULL;
+	}
+
+	json = ast_json_pack("{s: s, s: s}",
+		"application", new_snapshot->appl,
+		"application_data", new_snapshot->data);
+	if (!json) {
+		return NULL;
+	}
+
+	return stasis_json_event_channel_dialplan_create(new_snapshot, json);
+}
+
+static struct ast_json *channel_callerid(
+	struct ast_channel_snapshot *old_snapshot,
+	struct ast_channel_snapshot *new_snapshot)
+{
+	RAII_VAR(struct ast_json *, json, NULL, ast_json_unref);
+
+	/* No NewCallerid event on cache clear or first event */
+	if (!old_snapshot || !new_snapshot) {
+		return NULL;
 	}
 
+	if (ast_channel_snapshot_caller_id_equal(old_snapshot, new_snapshot)) {
+		return NULL;
+	}
+
+	json = ast_json_pack("{s: i, s: s}",
+		"caller_presentation", new_snapshot->caller_pres,
+		"caller_presentation_txt", ast_describe_caller_presentation(new_snapshot->caller_pres));
+	if (!json) {
+		return NULL;
+	}
+
+	return stasis_json_event_channel_caller_id_create(new_snapshot, json);
+}
+
+static struct ast_json *channel_snapshot(
+	struct ast_channel_snapshot *old_snapshot,
+	struct ast_channel_snapshot *new_snapshot)
+{
+	if (!new_snapshot) {
+		return NULL;
+	}
+
+	return stasis_json_event_channel_snapshot_create(new_snapshot);
+}
+
+channel_snapshot_monitor channel_monitors[] = {
+	channel_snapshot,
+	channel_state,
+	channel_dialplan,
+	channel_callerid
+};
+
+static int app_send_cb(void *obj, void *arg, int flags)
+{
+	struct app *app = obj;
+	struct ast_json *msg = arg;
+
 	app_send(app, msg);
+	return 0;
 }
 
-static void sub_handler(void *data, struct stasis_subscription *sub,
-			struct stasis_topic *topic,
-			struct stasis_message *message)
+static void sub_snapshot_handler(void *data,
+		struct stasis_subscription *sub,
+		struct stasis_topic *topic,
+		struct stasis_message *message)
 {
-	struct app *app = data;
+	RAII_VAR(struct ao2_container *, watching_apps, NULL, ao2_cleanup);
+	struct stasis_cache_update *update = stasis_message_data(message);
+	struct ast_channel_snapshot *new_snapshot = stasis_message_data(update->new_snapshot);
+	struct ast_channel_snapshot *old_snapshot = stasis_message_data(update->old_snapshot);
+	int i;
 
-	if (stasis_subscription_final_message(sub, message)) {
-		ao2_cleanup(data);
+	watching_apps = get_watching_apps(new_snapshot ? new_snapshot->uniqueid : old_snapshot->uniqueid);
+	if (!watching_apps) {
 		return;
 	}
 
-	if (ast_channel_snapshot_type() == stasis_message_type(message)) {
+	for (i = 0; i < ARRAY_LEN(channel_monitors); ++i) {
 		RAII_VAR(struct ast_json *, msg, NULL, ast_json_unref);
-		struct ast_channel_snapshot *snapshot =
-			stasis_message_data(message);
 
-		msg = app_event_create("channel-state-change", snapshot, NULL);
-		if (!msg) {
-			return;
+		msg = channel_monitors[i](old_snapshot, new_snapshot);
+		if (msg) {
+			ao2_callback(watching_apps, OBJ_NODATA, app_send_cb, msg);
 		}
-		app_send(app, msg);
-	} else if (ast_channel_dtmf_end_type() == stasis_message_type(message)) {
-		/* To simplify events, we'll only generate on DTMF end */
-		struct ast_channel_blob *blob = stasis_message_data(message);
-		dtmf_handler(app, blob);
 	}
+}
 
+static void distribute_message(struct ao2_container *apps, struct ast_json *msg)
+{
+	ao2_callback(apps, OBJ_NODATA, app_send_cb, msg);
+}
+
+static void generic_blob_handler(struct ast_channel_blob *obj, channel_blob_handler_cb handler_cb)
+{
+	RAII_VAR(struct ast_json *, msg, NULL, ast_json_unref);
+	RAII_VAR(struct ao2_container *, watching_apps, NULL, ao2_cleanup);
+
+	if (!obj->snapshot) {
+		return;
+	}
+
+	watching_apps = get_watching_apps(obj->snapshot->uniqueid);
+	if (!watching_apps) {
+		return;
+	}
+
+	msg = handler_cb(obj);
+	if (!msg) {
+		return;
+	}
+
+	distribute_message(watching_apps, msg);
 }
 
 /*!
@@ -544,8 +703,6 @@ int stasis_app_exec(struct ast_channel *chan, const char *app_name, int argc,
 	RAII_VAR(struct ao2_container *, apps, apps_registry(), ao2_cleanup);
 	RAII_VAR(struct app *, app, NULL, ao2_cleanup);
 	RAII_VAR(struct stasis_app_control *, control, NULL, control_unlink);
-	RAII_VAR(struct stasis_subscription *, subscription, NULL,
-		 stasis_unsubscribe);
 	int res = 0;
 	int hungup = 0;
 
@@ -570,21 +727,17 @@ int stasis_app_exec(struct ast_channel *chan, const char *app_name, int argc,
 		ao2_link(controls, control);
 	}
 
-	subscription =
-		stasis_subscribe(ast_channel_topic(chan), sub_handler, app);
-	if (subscription == NULL) {
-		ast_log(LOG_ERROR, "Error subscribing app %s to channel %s\n",
-			app_name, ast_channel_name(chan));
-		return -1;
-	}
-	ao2_ref(app, +1); /* subscription now has a reference */
-
 	res = send_start_msg(app, chan, argc, argv);
 	if (res != 0) {
 		ast_log(LOG_ERROR, "Error sending start message to %s\n", app_name);
 		return res;
 	}
 
+	if (app_add_channel(app, chan)) {
+		ast_log(LOG_ERROR, "Error adding listener for channel %s to app %s\n", ast_channel_name(chan), app_name);
+		return -1;
+	}
+
 	while (1) {
 		RAII_VAR(struct ast_frame *, f, NULL, ast_frame_dtor);
 		int r;
@@ -634,6 +787,7 @@ int stasis_app_exec(struct ast_channel *chan, const char *app_name, int argc,
 		}
 	}
 
+	app_remove_channel(app, chan);
 	res = send_end_msg(app, chan);
 	if (res != 0) {
 		ast_log(LOG_ERROR,
@@ -675,10 +829,16 @@ int stasis_app_register(const char *app_name, stasis_app_cb handler, void *data)
 
 	if (app) {
 		RAII_VAR(struct ast_json *, msg, NULL, ast_json_unref);
+		RAII_VAR(struct ast_json *, blob, NULL, ast_json_unref);
 		SCOPED_LOCK(app_lock, app, ao2_lock, ao2_unlock);
 
-		msg = app_event_create("application-replaced", NULL, NULL);
-		app->handler(app->data, app_name, msg);
+		blob = ast_json_pack("{s: s}", "application", app_name);
+		if (blob) {
+			msg = stasis_json_event_application_replaced_create(blob);
+			if (msg) {
+				app->handler(app->data, app_name, msg);
+			}
+		}
 
 		app->handler = handler;
 		ao2_cleanup(app->data);
@@ -706,6 +866,82 @@ void stasis_app_unregister(const char *app_name)
 	}
 }
 
+static struct ast_json *handle_blob_dtmf(struct ast_channel_blob *obj)
+{
+	RAII_VAR(struct ast_json *, extra, NULL, ast_json_unref);
+	RAII_VAR(struct ast_json *, msg, NULL, ast_json_unref);
+	const char *direction;
+
+	/* To simplify events, we'll only generate on receive */
+	direction = ast_json_string_get(
+		ast_json_object_get(obj->blob, "direction"));
+
+	if (strcmp("Received", direction) != 0) {
+		return NULL;
+	}
+
+	extra = ast_json_pack(
+		"{s: o}",
+		"digit", ast_json_ref(ast_json_object_get(obj->blob, "digit")));
+	if (!extra) {
+		return NULL;
+	}
+
+	return stasis_json_event_channel_dtmf_received_create(obj->snapshot, extra);
+}
+
+/* To simplify events, we'll only generate on DTMF end (dtmf_end type) */
+static void sub_dtmf_handler(void *data,
+		struct stasis_subscription *sub,
+		struct stasis_topic *topic,
+		struct stasis_message *message)
+{
+	struct ast_channel_blob *obj = stasis_message_data(message);
+	generic_blob_handler(obj, handle_blob_dtmf);
+}
+
+static struct ast_json *handle_blob_userevent(struct ast_channel_blob *obj)
+{
+	return stasis_json_event_channel_userevent_create(obj->snapshot, obj->blob);
+}
+
+static void sub_userevent_handler(void *data,
+		struct stasis_subscription *sub,
+		struct stasis_topic *topic,
+		struct stasis_message *message)
+{
+	struct ast_channel_blob *obj = stasis_message_data(message);
+	generic_blob_handler(obj, handle_blob_userevent);
+}
+
+static struct ast_json *handle_blob_hangup_request(struct ast_channel_blob *obj)
+{
+	return stasis_json_event_channel_hangup_request_create(obj->snapshot, obj->blob);
+}
+
+static void sub_hangup_request_handler(void *data,
+		struct stasis_subscription *sub,
+		struct stasis_topic *topic,
+		struct stasis_message *message)
+{
+	struct ast_channel_blob *obj = stasis_message_data(message);
+	generic_blob_handler(obj, handle_blob_hangup_request);
+}
+
+static struct ast_json *handle_blob_varset(struct ast_channel_blob *obj)
+{
+	return stasis_json_event_channel_varset_create(obj->snapshot, obj->blob);
+}
+
+static void sub_varset_handler(void *data,
+		struct stasis_subscription *sub,
+		struct stasis_topic *topic,
+		struct stasis_message *message)
+{
+	struct ast_channel_blob *obj = stasis_message_data(message);
+	generic_blob_handler(obj, handle_blob_varset);
+}
+
 static int load_module(void)
 {
 	int r = 0;
@@ -722,13 +958,30 @@ static int load_module(void)
 		return AST_MODULE_LOAD_FAILURE;
 	}
 
-	return r;
+	channel_router = stasis_message_router_create(stasis_caching_get_topic(ast_channel_topic_all_cached()));
+	if (!channel_router) {
+		return AST_MODULE_LOAD_FAILURE;
+	}
+
+	r |= stasis_message_router_add(channel_router, stasis_cache_update_type(), sub_snapshot_handler, NULL);
+	r |= stasis_message_router_add(channel_router, ast_channel_user_event_type(), sub_userevent_handler, NULL);
+	r |= stasis_message_router_add(channel_router, ast_channel_varset_type(), sub_varset_handler, NULL);
+	r |= stasis_message_router_add(channel_router, ast_channel_dtmf_begin_type(), sub_dtmf_handler, NULL);
+	r |= stasis_message_router_add(channel_router, ast_channel_hangup_request_type(), sub_hangup_request_handler, NULL);
+	if (r) {
+		return AST_MODULE_LOAD_FAILURE;
+	}
+
+	return AST_MODULE_LOAD_SUCCESS;
 }
 
 static int unload_module(void)
 {
 	int r = 0;
 
+	stasis_message_router_unsubscribe(channel_router);
+	channel_router = NULL;
+
 	ao2_cleanup(__apps_registry);
 	__apps_registry = NULL;
 

res/res_stasis_http_events.c

@@ -42,6 +42,7 @@ ASTERISK_FILE_VERSION(__FILE__, "$Revision$")
 
 #include "asterisk/module.h"
 #include "stasis_http/resource_events.h"
+#include "asterisk/stasis_channels.h"
 
 /*!
  * \brief Parameter parsing callback for /events.
@@ -76,6 +77,524 @@ static struct stasis_rest_handlers events = {
 	.children = {  }
 };
 
+struct ast_json *stasis_json_event_channel_snapshot_create(
+	struct ast_channel_snapshot *channel_snapshot
+	)
+{
+	RAII_VAR(struct ast_json *, message, NULL, ast_json_unref);
+	RAII_VAR(struct ast_json *, event, NULL, ast_json_unref);
+	int ret;
+
+	ast_assert(channel_snapshot != NULL);
+
+	event = ast_json_object_create();
+	if (!event) {
+		return NULL;
+	}
+
+	ret = ast_json_object_set(event,
+		"channel", ast_channel_snapshot_to_json(channel_snapshot));
+	if (ret) {
+		return NULL;
+	}
+
+	message = ast_json_pack("{s: o}", "channel_snapshot", ast_json_ref(event));
+	if (!message) {
+		return NULL;
+	}
+
+	return ast_json_ref(message);
+}
+
+struct ast_json *stasis_json_event_channel_destroyed_create(
+	struct ast_channel_snapshot *channel_snapshot,
+	struct ast_json *blob
+	)
+{
+	RAII_VAR(struct ast_json *, message, NULL, ast_json_unref);
+	RAII_VAR(struct ast_json *, event, NULL, ast_json_unref);
+	struct ast_json *validator;
+	int ret;
+
+	ast_assert(channel_snapshot != NULL);
+	ast_assert(blob != NULL);
+	ast_assert(ast_json_object_get(blob, "channel") == NULL);
+	ast_assert(ast_json_object_get(blob, "type") == NULL);
+
+	validator = ast_json_object_get(blob, "cause");
+	if (validator) {
+		/* do validation? XXX */
+	} else {
+		/* fail message generation if the required parameter doesn't exist */
+		return NULL;
+	}
+
+	validator = ast_json_object_get(blob, "cause_txt");
+	if (validator) {
+		/* do validation? XXX */
+	} else {
+		/* fail message generation if the required parameter doesn't exist */
+		return NULL;
+	}
+
+	event = ast_json_deep_copy(blob);
+	if (!event) {
+		return NULL;
+	}
+
+	ret = ast_json_object_set(event,
+		"channel", ast_channel_snapshot_to_json(channel_snapshot));
+	if (ret) {
+		return NULL;
+	}
+
+	message = ast_json_pack("{s: o}", "channel_destroyed", ast_json_ref(event));
+	if (!message) {
+		return NULL;
+	}
+
+	return ast_json_ref(message);
+}
+
+struct ast_json *stasis_json_event_channel_caller_id_create(
+	struct ast_channel_snapshot *channel_snapshot,
+	struct ast_json *blob
+	)
+{
+	RAII_VAR(struct ast_json *, message, NULL, ast_json_unref);
+	RAII_VAR(struct ast_json *, event, NULL, ast_json_unref);
+	struct ast_json *validator;
+	int ret;
+
+	ast_assert(channel_snapshot != NULL);
+	ast_assert(blob != NULL);
+	ast_assert(ast_json_object_get(blob, "channel") == NULL);
+	ast_assert(ast_json_object_get(blob, "type") == NULL);
+
+	validator = ast_json_object_get(blob, "caller_presentation_txt");
+	if (validator) {
+		/* do validation? XXX */
+	} else {
+		/* fail message generation if the required parameter doesn't exist */
+		return NULL;
+	}
+
+	validator = ast_json_object_get(blob, "caller_presentation");
+	if (validator) {
+		/* do validation? XXX */
+	} else {
+		/* fail message generation if the required parameter doesn't exist */
+		return NULL;
+	}
+
+	event = ast_json_deep_copy(blob);
+	if (!event) {
+		return NULL;
+	}
+
+	ret = ast_json_object_set(event,
+		"channel", ast_channel_snapshot_to_json(channel_snapshot));
+	if (ret) {
+		return NULL;
+	}
+
+	message = ast_json_pack("{s: o}", "channel_caller_id", ast_json_ref(event));
+	if (!message) {
+		return NULL;
+	}
+
+	return ast_json_ref(message);
+}
+
+struct ast_json *stasis_json_event_channel_hangup_request_create(
+	struct ast_channel_snapshot *channel_snapshot,
+	struct ast_json *blob
+	)
+{
+	RAII_VAR(struct ast_json *, message, NULL, ast_json_unref);
+	RAII_VAR(struct ast_json *, event, NULL, ast_json_unref);
+	struct ast_json *validator;
+	int ret;
+
+	ast_assert(channel_snapshot != NULL);
+	ast_assert(blob != NULL);
+	ast_assert(ast_json_object_get(blob, "channel") == NULL);
+	ast_assert(ast_json_object_get(blob, "type") == NULL);
+
+	validator = ast_json_object_get(blob, "soft");
+	if (validator) {
+		/* do validation? XXX */
+	}
+
+	validator = ast_json_object_get(blob, "cause");
+	if (validator) {
+		/* do validation? XXX */
+	}
+
+	event = ast_json_deep_copy(blob);
+	if (!event) {
+		return NULL;
+	}
+
+	ret = ast_json_object_set(event,
+		"channel", ast_channel_snapshot_to_json(channel_snapshot));
+	if (ret) {
+		return NULL;
+	}
+
+	message = ast_json_pack("{s: o}", "channel_hangup_request", ast_json_ref(event));
+	if (!message) {
+		return NULL;
+	}
+
+	return ast_json_ref(message);
+}
+
+struct ast_json *stasis_json_event_application_replaced_create(
+	struct ast_json *blob
+	)
+{
+	RAII_VAR(struct ast_json *, message, NULL, ast_json_unref);
+	RAII_VAR(struct ast_json *, event, NULL, ast_json_unref);
+	struct ast_json *validator;
+
+	ast_assert(blob != NULL);
+	ast_assert(ast_json_object_get(blob, "type") == NULL);
+
+	validator = ast_json_object_get(blob, "application");
+	if (validator) {
+		/* do validation? XXX */
+	} else {
+		/* fail message generation if the required parameter doesn't exist */
+		return NULL;
+	}
+
+	event = ast_json_deep_copy(blob);
+	if (!event) {
+		return NULL;
+	}
+
+	message = ast_json_pack("{s: o}", "application_replaced", ast_json_ref(event));
+	if (!message) {
+		return NULL;
+	}
+
+	return ast_json_ref(message);
+}
+
+struct ast_json *stasis_json_event_channel_varset_create(
+	struct ast_channel_snapshot *channel_snapshot,
+	struct ast_json *blob
+	)
+{
+	RAII_VAR(struct ast_json *, message, NULL, ast_json_unref);
+	RAII_VAR(struct ast_json *, event, NULL, ast_json_unref);
+	struct ast_json *validator;
+	int ret;
+
+	ast_assert(channel_snapshot != NULL);
+	ast_assert(blob != NULL);
+	ast_assert(ast_json_object_get(blob, "channel") == NULL);
+	ast_assert(ast_json_object_get(blob, "type") == NULL);
+
+	validator = ast_json_object_get(blob, "variable");
+	if (validator) {
+		/* do validation? XXX */
+	} else {
+		/* fail message generation if the required parameter doesn't exist */
+		return NULL;
+	}
+
+	validator = ast_json_object_get(blob, "value");
+	if (validator) {
+		/* do validation? XXX */
+	} else {
+		/* fail message generation if the required parameter doesn't exist */
+		return NULL;
+	}
+
+	event = ast_json_deep_copy(blob);
+	if (!event) {
+		return NULL;
+	}
+
+	ret = ast_json_object_set(event,
+		"channel", ast_channel_snapshot_to_json(channel_snapshot));
+	if (ret) {
+		return NULL;
+	}
+
+	message = ast_json_pack("{s: o}", "channel_varset", ast_json_ref(event));
+	if (!message) {
+		return NULL;
+	}
+
+	return ast_json_ref(message);
+}
+
+struct ast_json *stasis_json_event_channel_userevent_create(
+	struct ast_channel_snapshot *channel_snapshot,
+	struct ast_json *blob
+	)
+{
+	RAII_VAR(struct ast_json *, message, NULL, ast_json_unref);
+	RAII_VAR(struct ast_json *, event, NULL, ast_json_unref);
+	struct ast_json *validator;
+	int ret;
+
+	ast_assert(channel_snapshot != NULL);
+	ast_assert(blob != NULL);
+	ast_assert(ast_json_object_get(blob, "channel") == NULL);
+	ast_assert(ast_json_object_get(blob, "type") == NULL);
+
+	validator = ast_json_object_get(blob, "eventname");
+	if (validator) {
+		/* do validation? XXX */
+	} else {
+		/* fail message generation if the required parameter doesn't exist */
+		return NULL;
+	}
+
+	event = ast_json_deep_copy(blob);
+	if (!event) {
+		return NULL;
+	}
+
+	ret = ast_json_object_set(event,
+		"channel", ast_channel_snapshot_to_json(channel_snapshot));
+	if (ret) {
+		return NULL;
+	}
+
+	message = ast_json_pack("{s: o}", "channel_userevent", ast_json_ref(event));
+	if (!message) {
+		return NULL;
+	}
+
+	return ast_json_ref(message);
+}
+
+struct ast_json *stasis_json_event_channel_created_create(
+	struct ast_channel_snapshot *channel_snapshot
+	)
+{
+	RAII_VAR(struct ast_json *, message, NULL, ast_json_unref);
+	RAII_VAR(struct ast_json *, event, NULL, ast_json_unref);
+	int ret;
+
+	ast_assert(channel_snapshot != NULL);
+
+	event = ast_json_object_create();
+	if (!event) {
+		return NULL;
+	}
+
+	ret = ast_json_object_set(event,
+		"channel", ast_channel_snapshot_to_json(channel_snapshot));
+	if (ret) {
+		return NULL;
+	}
+
+	message = ast_json_pack("{s: o}", "channel_created", ast_json_ref(event));
+	if (!message) {
+		return NULL;
+	}
+
+	return ast_json_ref(message);
+}
+
+struct ast_json *stasis_json_event_stasis_start_create(
+	struct ast_channel_snapshot *channel_snapshot,
+	struct ast_json *blob
+	)
+{
+	RAII_VAR(struct ast_json *, message, NULL, ast_json_unref);
+	RAII_VAR(struct ast_json *, event, NULL, ast_json_unref);
+	struct ast_json *validator;
+	int ret;
+
+	ast_assert(channel_snapshot != NULL);
+	ast_assert(blob != NULL);
+	ast_assert(ast_json_object_get(blob, "channel") == NULL);
+	ast_assert(ast_json_object_get(blob, "type") == NULL);
+
+	validator = ast_json_object_get(blob, "args");
+	if (validator) {
+		/* do validation? XXX */
+	} else {
+		/* fail message generation if the required parameter doesn't exist */
+		return NULL;
+	}
+
+	event = ast_json_deep_copy(blob);
+	if (!event) {
+		return NULL;
+	}
+
+	ret = ast_json_object_set(event,
+		"channel", ast_channel_snapshot_to_json(channel_snapshot));
+	if (ret) {
+		return NULL;
+	}
+
+	message = ast_json_pack("{s: o}", "stasis_start", ast_json_ref(event));
+	if (!message) {
+		return NULL;
+	}
+
+	return ast_json_ref(message);
+}
+
+struct ast_json *stasis_json_event_channel_dialplan_create(
+	struct ast_channel_snapshot *channel_snapshot,
+	struct ast_json *blob
+	)
+{
+	RAII_VAR(struct ast_json *, message, NULL, ast_json_unref);
+	RAII_VAR(struct ast_json *, event, NULL, ast_json_unref);
+	struct ast_json *validator;
+	int ret;
+
+	ast_assert(channel_snapshot != NULL);
+	ast_assert(blob != NULL);
+	ast_assert(ast_json_object_get(blob, "channel") == NULL);
+	ast_assert(ast_json_object_get(blob, "type") == NULL);
+
+	validator = ast_json_object_get(blob, "application");
+	if (validator) {
+		/* do validation? XXX */
+	} else {
+		/* fail message generation if the required parameter doesn't exist */
+		return NULL;
+	}
+
+	validator = ast_json_object_get(blob, "application_data");
+	if (validator) {
+		/* do validation? XXX */
+	} else {
+		/* fail message generation if the required parameter doesn't exist */
+		return NULL;
+	}
+
+	event = ast_json_deep_copy(blob);
+	if (!event) {
+		return NULL;
+	}
+
+	ret = ast_json_object_set(event,
+		"channel", ast_channel_snapshot_to_json(channel_snapshot));
+	if (ret) {
+		return NULL;
+	}
+
+	message = ast_json_pack("{s: o}", "channel_dialplan", ast_json_ref(event));
+	if (!message) {
+		return NULL;
+	}
+
+	return ast_json_ref(message);
+}
+
+struct ast_json *stasis_json_event_channel_state_change_create(
+	struct ast_channel_snapshot *channel_snapshot
+	)
+{
+	RAII_VAR(struct ast_json *, message, NULL, ast_json_unref);
+	RAII_VAR(struct ast_json *, event, NULL, ast_json_unref);
+	int ret;
+
+	ast_assert(channel_snapshot != NULL);
+
+	event = ast_json_object_create();
+	if (!event) {
+		return NULL;
+	}
+
+	ret = ast_json_object_set(event,
+		"channel", ast_channel_snapshot_to_json(channel_snapshot));
+	if (ret) {
+		return NULL;
+	}
+
+	message = ast_json_pack("{s: o}", "channel_state_change", ast_json_ref(event));
+	if (!message) {
+		return NULL;
+	}
+
+	return ast_json_ref(message);
+}
+
+struct ast_json *stasis_json_event_channel_dtmf_received_create(
+	struct ast_channel_snapshot *channel_snapshot,
+	struct ast_json *blob
+	)
+{
+	RAII_VAR(struct ast_json *, message, NULL, ast_json_unref);
+	RAII_VAR(struct ast_json *, event, NULL, ast_json_unref);
+	struct ast_json *validator;
+	int ret;
+
+	ast_assert(channel_snapshot != NULL);
+	ast_assert(blob != NULL);
+	ast_assert(ast_json_object_get(blob, "channel") == NULL);
+	ast_assert(ast_json_object_get(blob, "type") == NULL);
+
+	validator = ast_json_object_get(blob, "digit");
+	if (validator) {
+		/* do validation? XXX */
+	} else {
+		/* fail message generation if the required parameter doesn't exist */
+		return NULL;
+	}
+
+	event = ast_json_deep_copy(blob);
+	if (!event) {
+		return NULL;
+	}
+
+	ret = ast_json_object_set(event,
+		"channel", ast_channel_snapshot_to_json(channel_snapshot));
+	if (ret) {
+		return NULL;
+	}
+
+	message = ast_json_pack("{s: o}", "channel_dtmf_received", ast_json_ref(event));
+	if (!message) {
+		return NULL;
+	}
+
+	return ast_json_ref(message);
+}
+
+struct ast_json *stasis_json_event_stasis_end_create(
+	struct ast_channel_snapshot *channel_snapshot
+	)
+{
+	RAII_VAR(struct ast_json *, message, NULL, ast_json_unref);
+	RAII_VAR(struct ast_json *, event, NULL, ast_json_unref);
+	int ret;
+
+	ast_assert(channel_snapshot != NULL);
+
+	event = ast_json_object_create();
+	if (!event) {
+		return NULL;
+	}
+
+	ret = ast_json_object_set(event,
+		"channel", ast_channel_snapshot_to_json(channel_snapshot));
+	if (ret) {
+		return NULL;
+	}
+
+	message = ast_json_pack("{s: o}", "stasis_end", ast_json_ref(event));
+	if (!message) {
+		return NULL;
+	}
+
+	return ast_json_ref(message);
+}
+
 static int load_module(void)
 {
 	return stasis_http_add_handler(&events);

res/res_stasis_websocket.c

@@ -52,10 +52,6 @@ static struct ast_json *oom_json;
  */
 #define APPS_NUM_BUCKETS 7
 
-struct websocket_app {
-	char *name;
-};
-
 /*!
  * \internal
  * \brief Helper to write a JSON object to a WebSocket.
@@ -78,35 +74,6 @@ static int websocket_write_json(struct ast_websocket *session,
 				   strlen(str));
 }
 
-/*! Hash function for websocket_app */
-static int hash_app(const void *obj, const int flags)
-{
-	const struct websocket_app *app = obj;
-	const char *name = flags & OBJ_KEY ? obj : app->name;
-
-	return ast_str_hash(name);
-}
-
-/*! Comparison function for websocket_app */
-static int compare_app(void *lhs, void *rhs, int flags)
-{
-	const struct websocket_app *lhs_app = lhs;
-	const struct websocket_app *rhs_app = rhs;
-	const char *rhs_name = flags & OBJ_KEY ? rhs : rhs_app->name;
-
-	if (strcmp(lhs_app->name, rhs_name) == 0) {
-		return CMP_MATCH;
-	} else {
-		return 0;
-	}
-}
-
-static void app_dtor(void *obj)
-{
-	struct websocket_app *app = obj;
-	ast_free(app->name);
-}
-
 struct stasis_ws_session_info {
 	struct ast_websocket *ws_session;
 	struct ao2_container *websocket_apps;
@@ -132,7 +99,7 @@ static struct stasis_ws_session_info *session_create(
 
 	session->ws_session = ws_session;
 	session->websocket_apps =
-		ao2_container_alloc(APPS_NUM_BUCKETS, hash_app, compare_app);
+		ast_str_container_alloc(APPS_NUM_BUCKETS);
 
 	if (!session->websocket_apps) {
 		return NULL;
@@ -154,12 +121,12 @@ static struct stasis_ws_session_info *session_create(
 static void session_shutdown(struct stasis_ws_session_info *session)
 {
         struct ao2_iterator i;
-	struct websocket_app *app;
+	char *app;
 	SCOPED_AO2LOCK(lock, session);
 
 	i = ao2_iterator_init(session->websocket_apps, 0);
 	while ((app = ao2_iterator_next(&i))) {
-		stasis_app_unregister(app->name);
+		stasis_app_unregister(app);
 		ao2_cleanup(app);
 	}
 	ao2_iterator_destroy(&i);
@@ -212,15 +179,10 @@ static int session_register_apps(struct stasis_ws_session_info *session,
 		return -1;
 	}
 	while ((app_name = strsep(&apps, ","))) {
-		RAII_VAR(struct websocket_app *, app, NULL, ao2_cleanup);
-
-		app = ao2_alloc(sizeof(*app), app_dtor);
-		if (!app) {
+		if (ast_str_container_add(session->websocket_apps, app_name)) {
 			websocket_write_json(session->ws_session, oom_json);
 			return -1;
 		}
-		app->name = ast_strdup(app_name);
-		ao2_link(session->websocket_apps, app);
 
 		stasis_app_register(app_name, app_handler, session);
 	}

res/stasis_http/resource_endpoints.h

@@ -83,8 +83,8 @@ void stasis_http_get_endpoint(struct ast_variable *headers, struct ast_get_endpo
  * JSON models
  *
  * Endpoint
+ * - resource: string (required)
  * - technology: string (required)
- * - name: string (required)
  */
 
 #endif /* _ASTERISK_RESOURCE_ENDPOINTS_H */

res/stasis_http/resource_events.h

@@ -55,42 +55,240 @@ struct ast_event_websocket_args {
  */
 void stasis_http_event_websocket(struct ast_variable *headers, struct ast_event_websocket_args *args, struct stasis_http_response *response);
 
+struct ast_channel_snapshot;
+struct ast_bridge_snapshot;
+
+/*!
+ * \brief Some part of channel state changed.
+ *
+ * \param channel The channel to be used to generate this event
+ *
+ * \retval NULL on error
+ * \retval JSON (ast_json) describing the event
+ */
+struct ast_json *stasis_json_event_channel_snapshot_create(
+	struct ast_channel_snapshot *channel_snapshot
+	);
+
+/*!
+ * \brief Notification that a channel has been destroyed.
+ *
+ * \param channel The channel to be used to generate this event
+ * \param blob JSON blob containing the following parameters:
+ * - cause: integer - Integer representation of the cause of the hangup (required)
+ * - cause_txt: string - Text representation of the cause of the hangup (required)
+ *
+ * \retval NULL on error
+ * \retval JSON (ast_json) describing the event
+ */
+struct ast_json *stasis_json_event_channel_destroyed_create(
+	struct ast_channel_snapshot *channel_snapshot,
+	struct ast_json *blob
+	);
+
+/*!
+ * \brief Channel changed Caller ID.
+ *
+ * \param channel The channel that changed Caller ID.
+ * \param blob JSON blob containing the following parameters:
+ * - caller_presentation_txt: string - The text representation of the Caller Presentation value. (required)
+ * - caller_presentation: integer - The integer representation of the Caller Presentation value. (required)
+ *
+ * \retval NULL on error
+ * \retval JSON (ast_json) describing the event
+ */
+struct ast_json *stasis_json_event_channel_caller_id_create(
+	struct ast_channel_snapshot *channel_snapshot,
+	struct ast_json *blob
+	);
+
+/*!
+ * \brief A hangup was requested on the channel.
+ *
+ * \param channel The channel on which the hangup was requested.
+ * \param blob JSON blob containing the following parameters:
+ * - soft: boolean - Whether the hangup request was a soft hangup request.
+ * - cause: integer - Integer representation of the cause of the hangup.
+ *
+ * \retval NULL on error
+ * \retval JSON (ast_json) describing the event
+ */
+struct ast_json *stasis_json_event_channel_hangup_request_create(
+	struct ast_channel_snapshot *channel_snapshot,
+	struct ast_json *blob
+	);
+
+/*!
+ * \brief Notification that another WebSocket has taken over for an application.
+ *
+ * \param blob JSON blob containing the following parameters:
+ * - application: string  (required)
+ *
+ * \retval NULL on error
+ * \retval JSON (ast_json) describing the event
+ */
+struct ast_json *stasis_json_event_application_replaced_create(
+	struct ast_json *blob
+	);
+
+/*!
+ * \brief Channel variable changed.
+ *
+ * \param channel The channel on which the variable was set.
+ * \param blob JSON blob containing the following parameters:
+ * - variable: string - The variable that changed. (required)
+ * - value: string - The new value of the variable. (required)
+ *
+ * \retval NULL on error
+ * \retval JSON (ast_json) describing the event
+ */
+struct ast_json *stasis_json_event_channel_varset_create(
+	struct ast_channel_snapshot *channel_snapshot,
+	struct ast_json *blob
+	);
+
+/*!
+ * \brief User-generated event with additional user-defined fields in the object.
+ *
+ * \param channel The channel that signaled the user event.
+ * \param blob JSON blob containing the following parameters:
+ * - eventname: string - The name of the user event. (required)
+ *
+ * \retval NULL on error
+ * \retval JSON (ast_json) describing the event
+ */
+struct ast_json *stasis_json_event_channel_userevent_create(
+	struct ast_channel_snapshot *channel_snapshot,
+	struct ast_json *blob
+	);
+
+/*!
+ * \brief Notification that a channel has been created.
+ *
+ * \param channel The channel to be used to generate this event
+ *
+ * \retval NULL on error
+ * \retval JSON (ast_json) describing the event
+ */
+struct ast_json *stasis_json_event_channel_created_create(
+	struct ast_channel_snapshot *channel_snapshot
+	);
+
+/*!
+ * \brief Notification that a channel has entered a Stasis appliction.
+ *
+ * \param channel The channel to be used to generate this event
+ * \param blob JSON blob containing the following parameters:
+ * - args: List[string] - Arguments to the application (required)
+ *
+ * \retval NULL on error
+ * \retval JSON (ast_json) describing the event
+ */
+struct ast_json *stasis_json_event_stasis_start_create(
+	struct ast_channel_snapshot *channel_snapshot,
+	struct ast_json *blob
+	);
+
+/*!
+ * \brief Channel changed location in the dialplan.
+ *
+ * \param channel The channel that changed dialplan location.
+ * \param blob JSON blob containing the following parameters:
+ * - application: string - The application that the channel is currently in. (required)
+ * - application_data: string - The data that was passed to the application when it was invoked. (required)
+ *
+ * \retval NULL on error
+ * \retval JSON (ast_json) describing the event
+ */
+struct ast_json *stasis_json_event_channel_dialplan_create(
+	struct ast_channel_snapshot *channel_snapshot,
+	struct ast_json *blob
+	);
+
+/*!
+ * \brief Notification of a channel's state change.
+ *
+ * \param channel The channel to be used to generate this event
+ *
+ * \retval NULL on error
+ * \retval JSON (ast_json) describing the event
+ */
+struct ast_json *stasis_json_event_channel_state_change_create(
+	struct ast_channel_snapshot *channel_snapshot
+	);
+
+/*!
+ * \brief DTMF received on a channel.
+ *
+ * \param channel The channel on which DTMF was received
+ * \param blob JSON blob containing the following parameters:
+ * - digit: string - DTMF digit received (0-9, A-E, # or *) (required)
+ *
+ * \retval NULL on error
+ * \retval JSON (ast_json) describing the event
+ */
+struct ast_json *stasis_json_event_channel_dtmf_received_create(
+	struct ast_channel_snapshot *channel_snapshot,
+	struct ast_json *blob
+	);
+
+/*!
+ * \brief Notification that a channel has left a Stasis appliction.
+ *
+ * \param channel The channel to be used to generate this event
+ *
+ * \retval NULL on error
+ * \retval JSON (ast_json) describing the event
+ */
+struct ast_json *stasis_json_event_stasis_end_create(
+	struct ast_channel_snapshot *channel_snapshot
+	);
+
 /*
  * JSON models
  *
- * DtmfReceived
- * - digit: string 
- * - channel: Channel 
- * BridgeCreated
- * - bridge: Bridge 
- * BridgeDestroyed
- * - bridge: Bridge 
+ * ChannelSnapshot
+ * ChannelDestroyed
+ * - cause: integer (required)
+ * - cause_txt: string (required)
+ * ChannelCallerId
+ * - caller_presentation_txt: string (required)
+ * - caller_presentation: integer (required)
+ * ChannelHangupRequest
+ * - soft: boolean
+ * - cause: integer
  * ApplicationReplaced
- * - application: string 
- * ChannelLeftBridge
- * - bridge: Bridge 
- * - channel: Channel 
+ * - application: string (required)
+ * ChannelVarset
+ * - variable: string (required)
+ * - value: string (required)
+ * ChannelUserevent
+ * - eventname: string (required)
+ * ChannelCreated
  * StasisStart
- * - args: List[string] 
- * - channel_info: Channel 
- * StasisEnd
- * - channel_info: Channel 
+ * - args: List[string] (required)
+ * ChannelDialplan
+ * - application: string (required)
+ * - application_data: string (required)
  * ChannelStateChange
- * - channel_info: Channel 
- * ChannelEnteredBridge
- * - bridge: Bridge 
- * - channel: Channel 
+ * ChannelDtmfReceived
+ * - digit: string (required)
  * Event
- * - stasis_start: StasisStart 
- * - channel_entered_bridge: ChannelEnteredBridge 
- * - channel_left_bridge: ChannelLeftBridge 
- * - application_replaced: ApplicationReplaced 
- * - channel_state_change: ChannelStateChange 
- * - bridge_created: BridgeCreated 
+ * - channel_created: ChannelCreated
+ * - channel_destroyed: ChannelDestroyed
+ * - channel_dialplan: ChannelDialplan
+ * - channel_varset: ChannelVarset
+ * - application_replaced: ApplicationReplaced
+ * - channel_state_change: ChannelStateChange
+ * - stasis_start: StasisStart
  * - application: string (required)
- * - stasis_end: StasisEnd 
- * - dtmf_received: DtmfReceived 
- * - bridge_destroyed: BridgeDestroyed 
+ * - channel_hangup_request: ChannelHangupRequest
+ * - channel_userevent: ChannelUserevent
+ * - channel_snapshot: ChannelSnapshot
+ * - channel_dtmf_received: ChannelDtmfReceived
+ * - channel_caller_id: ChannelCallerId
+ * - stasis_end: StasisEnd
+ * StasisEnd
  */
 
 #endif /* _ASTERISK_RESOURCE_EVENTS_H */

res/stasis_http/resource_recordings.h

@@ -196,8 +196,8 @@ void stasis_http_unmute_recording(struct ast_variable *headers, struct ast_unmut
  * Recording
  * - id: string (required)
  * StoredRecording
- * - durationSeconds: int 
- * - time: Date 
+ * - durationSeconds: int
+ * - time: Date
  * - id: string (required)
  * - formats: List[string] (required)
  * LiveRecording

res/stasis_http/resource_sounds.h

@@ -71,7 +71,7 @@ void stasis_http_get_stored_sound(struct ast_variable *headers, struct ast_get_s
  *
  * Sound
  * - lang: string (required)
- * - text: string 
+ * - text: string
  * - id: string (required)
  * - formats: List[string] (required)
  */

rest-api-templates/asterisk_processor.py

@@ -107,7 +107,6 @@ class PathSegment(Stringify):
         """
         return len(self.__children)
 
-
 class AsteriskProcessor(SwaggerPostProcessor):
     """A SwaggerPostProcessor which adds fields needed to generate Asterisk
     RESTful HTTP binding code.
@@ -145,6 +144,18 @@ class AsteriskProcessor(SwaggerPostProcessor):
                 segment = resource_api.root_path.get_child(api.path.split('/'))
                 for operation in api.operations:
                     segment.operations.append(operation)
+            resource_api.api_declaration.has_events = False
+            for model in resource_api.api_declaration.models:
+                if model.id == "Event":
+                    resource_api.api_declaration.has_events = True
+                    break
+            if resource_api.api_declaration.has_events:
+                resource_api.api_declaration.events = \
+                    [self.process_model(model, context) for model in \
+                        resource_api.api_declaration.models if model.id != "Event"]
+            else:
+                resource_api.api_declaration.events = []
+
             # Since every API path should start with /[resource], root should
             # have exactly one child.
             if resource_api.root_path.num_children() != 1:
@@ -177,3 +188,43 @@ class AsteriskProcessor(SwaggerPostProcessor):
             parameter.c_space = ''
         else:
             parameter.c_space = ' '
+
+    def process_model(self, model, context):
+        model.c_id = snakify(model.id)
+        model.channel = False
+        model.channel_desc = ""
+        model.bridge = False
+        model.bridge_desc = ""
+        model.properties = [self.process_property(model, prop, context) for prop in model.properties]
+        model.properties = [prop for prop in model.properties if prop]
+	model.has_properties = (len(model.properties) != 0)
+        return model
+
+    def process_property(self, model, prop, context):
+        # process channel separately since it will be pulled out
+        if prop.name == 'channel' and prop.type == 'Channel':
+            model.channel = True
+            model.channel_desc = prop.description or ""
+            return None
+
+        # process bridge separately since it will be pulled out
+        if prop.name == 'bridge' and prop.type == 'Bridge':
+            model.bridge = True
+            model.bridge_desc = prop.description or ""
+            return None
+
+	prop.c_name = snakify(prop.name)
+        if prop.type in self.type_mapping:
+            prop.c_type = self.type_mapping[prop.type]
+            prop.c_convert = self.convert_mapping[prop.c_type]
+        else:
+            prop.c_type = "Property type %s not mappable to a C type" % (prop.type)
+            prop.c_convert = "Property type %s not mappable to a C conversion" % (prop.type)
+            #raise SwaggerError(
+            #    "Invalid property type %s" % prop.type, context)
+        # You shouldn't put a space between 'char *' and the variable
+        if prop.c_type.endswith('*'):
+            prop.c_space = ''
+        else:
+            prop.c_space = ' '
+        return prop

rest-api-templates/event_function_decl.mustache

@@ -0,0 +1,10 @@
+struct ast_json *stasis_json_event_{{c_id}}_create(
+{{#bridge}}
+	struct ast_bridge_snapshot *bridge_snapshot{{#channel}},{{/channel}}{{^channel}}{{#has_properties}},{{/has_properties}}{{/channel}}
+{{/bridge}}
+{{#channel}}
+	struct ast_channel_snapshot *channel_snapshot{{#has_properties}},{{/has_properties}}
+{{/channel}}
+{{#has_properties}}
+	struct ast_json *blob
+{{/has_properties}}

rest-api-templates/res_stasis_http_resource.c.mustache

@@ -47,6 +47,9 @@ ASTERISK_FILE_VERSION(__FILE__, "$Revision$")
 
 #include "asterisk/module.h"
 #include "stasis_http/resource_{{name}}.h"
+{{#has_events}}
+#include "asterisk/stasis_channels.h"
+{{/has_events}}
 
 {{#apis}}
 {{#operations}}
@@ -96,6 +99,89 @@ static void stasis_http_{{c_nickname}}_cb(
 {{> rest_handler}}
 {{/root_path}}
 
+{{#has_events}}
+{{#events}}
+{{> event_function_decl}}
+	)
+{
+	RAII_VAR(struct ast_json *, message, NULL, ast_json_unref);
+	RAII_VAR(struct ast_json *, event, NULL, ast_json_unref);
+{{#has_properties}}
+	struct ast_json *validator;
+{{/has_properties}}
+{{#channel}}
+	int ret;
+{{/channel}}
+{{#bridge}}
+{{^channel}}
+	int ret;
+{{/channel}}
+{{/bridge}}
+
+{{#channel}}
+	ast_assert(channel_snapshot != NULL);
+{{/channel}}
+{{#bridge}}
+	ast_assert(bridge_snapshot != NULL);
+{{/bridge}}
+{{#has_properties}}
+	ast_assert(blob != NULL);
+{{#channel}}
+	ast_assert(ast_json_object_get(blob, "channel") == NULL);
+{{/channel}}
+{{#bridge}}
+	ast_assert(ast_json_object_get(blob, "bridge") == NULL);
+{{/bridge}}
+	ast_assert(ast_json_object_get(blob, "type") == NULL);
+{{#properties}}
+
+	validator = ast_json_object_get(blob, "{{name}}");
+	if (validator) {
+		/* do validation? XXX */
+{{#required}}
+	} else {
+		/* fail message generation if the required parameter doesn't exist */
+		return NULL;
+{{/required}}
+	}
+{{/properties}}
+
+	event = ast_json_deep_copy(blob);
+{{/has_properties}}
+{{^has_properties}}
+
+	event = ast_json_object_create();
+{{/has_properties}}
+	if (!event) {
+		return NULL;
+	}
+
+{{#channel}}
+	ret = ast_json_object_set(event,
+		"channel", ast_channel_snapshot_to_json(channel_snapshot));
+	if (ret) {
+		return NULL;
+	}
+
+{{/channel}}
+{{#bridge}}
+	ret = ast_json_object_set(event,
+		"bridge", ast_bridge_snapshot_to_json(bridge_snapshot));
+	if (ret) {
+		return NULL;
+	}
+
+{{/bridge}}
+	message = ast_json_pack("{s: o}", "{{c_id}}", ast_json_ref(event));
+	if (!message) {
+		return NULL;
+	}
+
+	return ast_json_ref(message);
+}
+
+{{/events}}
+{{/has_events}}
 static int load_module(void)
 {
 	return stasis_http_add_handler(&{{root_full_name}});

rest-api-templates/stasis_http_resource.h.mustache

@@ -64,16 +64,48 @@ void stasis_http_{{c_nickname}}(struct ast_variable *headers, struct ast_{{c_nic
 {{/operations}}
 {{/apis}}
 
+{{#has_events}}
+struct ast_channel_snapshot;
+struct ast_bridge_snapshot;
+
+{{#events}}
+/*!
+ * \brief {{description}}
+{{#notes}}
+ *
+ * {{{notes}}}
+{{/notes}}
+ *
+{{#channel}}
+ * \param channel {{#channel_desc}}{{channel_desc}}{{/channel_desc}}{{^channel_desc}}The channel to be used to generate this event{{/channel_desc}}
+{{/channel}}
+{{#bridge}}
+ * \param bridge {{#bridge_desc}}{{bridge_desc}}{{/bridge_desc}}{{^bridge_desc}}The bridge to be used to generate this event{{/bridge_desc}}
+{{/bridge}}
+{{#has_properties}}
+ * \param blob JSON blob containing the following parameters:
+{{/has_properties}}
+{{#properties}}
+ * - {{name}}: {{type}} {{#description}}- {{description}}{{/description}}{{#required}} (required){{/required}}
+{{/properties}}
+ *
+ * \retval NULL on error
+ * \retval JSON (ast_json) describing the event
+ */
+{{> event_function_decl}}
+	);
+
+{{/events}}
+{{/has_events}}
 /*
  * JSON models
  *
 {{#models}}
  * {{id}}
 {{#properties}}
- * - {{name}}: {{type}} {{#required}}(required){{/required}}
+ * - {{name}}: {{type}}{{#required}} (required){{/required}}
 {{/properties}}
-{{/models}}
- */
+{{/models}} */
 
 #endif /* _ASTERISK_RESOURCE_{{name_caps}}_H */
 {{/api_declaration}}

rest-api-templates/swagger_model.py

@@ -295,13 +295,17 @@ class Model(Stringify):
 
     def __init__(self):
         self.id = None
+        self.notes = None
+        self.description = None
         self.properties = None
 
     def load(self, id, model_json, processor, context):
         context = add_context(context, model_json, 'id')
+        # This arrangement is required by the Swagger API spec
         self.id = model_json.get('id')
         if id != self.id:
             raise SwaggerError("Model id doesn't match name", c)
+        self.description = model_json.get('description')
         props = model_json.get('properties').items() or []
         self.properties = [
             Property(k).load(j, processor, context) for (k, j) in props]

rest-api/api-docs/events.json

@@ -54,12 +54,16 @@
 					"required": true
 				},
 				"application_replaced": { "type": "ApplicationReplaced" },
-				"bridge_created": { "type": "BridgeCreated" },
-				"bridge_destroyed": { "type": "BridgeDestroyed" },
-				"channel_entered_bridge": { "type": "ChannelEnteredBridge" },
-				"channel_left_bridge": { "type": "ChannelLeftBridge" },
+				"channel_created": { "type": "ChannelCreated" },
+				"channel_destroyed": { "type": "ChannelDestroyed" },
+				"channel_snapshot": { "type": "ChannelSnapshot" },
 				"channel_state_change": { "type": "ChannelStateChange" },
-				"dtmf_received": { "type": "DtmfReceived" },
+				"channel_dtmf_received": { "type": "ChannelDtmfReceived" },
+				"channel_dialplan": { "type": "ChannelDialplan" },
+				"channel_caller_id": { "type": "ChannelCallerId" },
+				"channel_userevent": { "type": "ChannelUserevent" },
+				"channel_hangup_request": { "type": "ChannelHangupRequest" },
+				"channel_varset": { "type": "ChannelVarset" },
 				"stasis_end": { "type": "StasisEnd" },
 				"stasis_start": { "type": "StasisStart" }
 			}
@@ -70,48 +74,47 @@
 			"notes": "An application may only be subscribed to by a single WebSocket at a time. If multiple WebSockets attempt to subscribe to the same application, the newer WebSocket wins, and the older one receives this event.",
 			"properties": {
 				"application": {
+					"required": true,
 					"type": "string"
 				}
 			}
 		},
-		"BridgeCreated": {
-			"id": "BridgeCreated",
-			"description": "Notification that a bridge has been created.",
+		"ChannelCreated": {
+			"id": "ChannelCreated",
+			"description": "Notification that a channel has been created.",
 			"properties": {
-				"bridge": {
-					"type": "Bridge"
-				}
-			}
-		},
-		"BridgeDestroyed": {
-			"id": "BridgeDestroyed",
-			"description": "Notification that a bridge has been destroyed.",
-			"properties": {
-				"bridge": {
-					"type": "Bridge"
+				"channel": {
+					"required": true,
+					"type": "Channel"
 				}
 			}
 		},
-		"ChannelEnteredBridge": {
-			"id": "ChannelEnteredBridge",
-			"description": "Notification that a channel has entered a bridge.",
+		"ChannelSnapshot": {
+			"id": "ChannelSnapshot",
+			"description": "Some part of channel state changed.",
 			"properties": {
-				"bridge": {
-					"type": "Bridge"
-				},
 				"channel": {
+					"required": true,
 					"type": "Channel"
 				}
 			}
 		},
-		"ChannelLeftBridge": {
-			"id": "ChannelLeftBridge",
-			"description": "Notification that a channel has left a bridge.",
+		"ChannelDestroyed": {
+			"id": "ChannelDestroyed",
+			"description": "Notification that a channel has been destroyed.",
 			"properties": {
-				"bridge": {
-					"type": "Bridge"
+				"cause": {
+					"required": true,
+					"description": "Integer representation of the cause of the hangup",
+					"type": "integer"
+				},
+				"cause_txt": {
+					"required": true,
+					"description": "Text representation of the cause of the hangup",
+					"type": "string"
 				},
 				"channel": {
+					"required": true,
 					"type": "Channel"
 				}
 			}
@@ -120,31 +123,133 @@
 			"id": "ChannelStateChange",
 			"description": "Notification of a channel's state change.",
 			"properties": {
-				"channel_info": {
+				"channel": {
+					"required": true,
 					"type": "Channel"
 				}
 			}
 		},
-		"DtmfReceived": {
-			"id": "DtmfReceived",
+		"ChannelDtmfReceived": {
+			"id": "ChannelDtmfReceived",
 			"description": "DTMF received on a channel.",
 			"notes": "This event is sent when the DTMF ends. There is no notification about the start of DTMF",
 			"properties": {
 				"digit": {
+					"required": true,
 					"type": "string",
 					"description": "DTMF digit received (0-9, A-E, # or *)"
 				},
 				"channel": {
+					"required": true,
 					"type": "Channel",
 					"description": "The channel on which DTMF was received"
 				}
 			}
 		},
+		"ChannelDialplan": {
+			"id": "ChannelDialplan",
+			"description": "Channel changed location in the dialplan.",
+			"properties": {
+				"application": {
+					"required": true,
+					"type": "string",
+					"description": "The application that the channel is currently in."
+				},
+				"application_data": {
+					"required": true,
+					"type": "string",
+					"description": "The data that was passed to the application when it was invoked."
+				},
+				"channel": {
+					"required": true,
+					"type": "Channel",
+					"description": "The channel that changed dialplan location."
+				}
+			}
+		},
+		"ChannelCallerId": {
+			"id": "ChannelCallerId",
+			"description": "Channel changed Caller ID.",
+			"properties": {
+				"caller_presentation": {
+					"required": true,
+					"type": "integer",
+					"description": "The integer representation of the Caller Presentation value."
+				},
+				"caller_presentation_txt": {
+					"required": true,
+					"type": "string",
+					"description": "The text representation of the Caller Presentation value."
+				},
+				"channel": {
+					"required": true,
+					"type": "Channel",
+					"description": "The channel that changed Caller ID."
+				}
+			}
+		},
+		"ChannelUserevent": {
+			"id": "ChannelUserevent",
+			"description": "User-generated event with additional user-defined fields in the object.",
+			"properties": {
+				"eventname": {
+					"required": true,
+					"type": "string",
+					"description": "The name of the user event."
+				},
+				"channel": {
+					"required": true,
+					"type": "Channel",
+					"description": "The channel that signaled the user event."
+				}
+			}
+		},
+		"ChannelHangupRequest": {
+			"id": "ChannelHangupRequest",
+			"description": "A hangup was requested on the channel.",
+			"properties": {
+				"cause": {
+					"type": "integer",
+					"description": "Integer representation of the cause of the hangup."
+				},
+				"soft": {
+					"type": "boolean",
+					"description": "Whether the hangup request was a soft hangup request."
+				},
+				"channel": {
+					"required": true,
+					"type": "Channel",
+					"description": "The channel on which the hangup was requested."
+				}
+			}
+		},
+		"ChannelVarset": {
+			"id": "ChannelVarset",
+			"description": "Channel variable changed.",
+			"properties": {
+				"variable": {
+					"required": true,
+					"type": "string",
+					"description": "The variable that changed."
+				},
+				"value": {
+					"required": true,
+					"type": "string",
+					"description": "The new value of the variable."
+				},
+				"channel": {
+					"required": true,
+					"type": "Channel",
+					"description": "The channel on which the variable was set."
+				}
+			}
+		},
 		"StasisEnd": {
 			"id": "StasisEnd",
 			"description": "Notification that a channel has left a Stasis appliction.",
 			"properties": {
-				"channel_info": {
+				"channel": {
+					"required": true,
 					"type": "Channel"
 				}
 			}
@@ -154,10 +259,12 @@
 			"description": "Notification that a channel has entered a Stasis appliction.",
 			"properties": {
 				"args": {
+					"required": true,
 					"type": "List[string]",
 					"description": "Arguments to the application"
 				},
-				"channel_info": {
+				"channel": {
+					"required": true,
 					"type": "Channel"
 				}
 			}