Prior to this patch, when a WebSocket connection is made, ARI would not be informed of the connection until after the WebSocket layer had accepted the connection. This created a brief race condition where the ARI client would be notified that it was connected, a channel would be sent into the Stasis dialplan application, but ARI would not yet have registered the Stasis application presented in the HTTP request that established the WebSocket. This patch resolves this issue by doing the following: * When a WebSocket attempt is made, a callback is made into the ARI application layer, which verifies and registers the apps presented in the HTTP request. Because we do not yet have a WebSocket, we cannot have an event session for the corresponding applications. Some defensive checks were thus added to make the application objects tolerant to a NULL event session. * When a WebSocket connection is made, the registered application is updated with the newly created event session that wraps the WebSocket connection. ASTERISK-24988 #close Reported by: Joshua Colp Change-Id: Ia5dc60dc2b6bee76cd5aff0f69dd53b36e83f636
1288 lines
33 KiB
C
1288 lines
33 KiB
C
/*
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* Asterisk -- An open source telephony toolkit.
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*
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* Copyright (C) 2013, Digium, Inc.
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*
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* David M. Lee, II <dlee@digium.com>
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*
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* See http://www.asterisk.org for more information about
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* the Asterisk project. Please do not directly contact
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* any of the maintainers of this project for assistance;
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* the project provides a web site, mailing lists and IRC
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* channels for your use.
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*
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* This program is free software, distributed under the terms of
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* the GNU General Public License Version 2. See the LICENSE file
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* at the top of the source tree.
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*/
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/*! \file
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*
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* \brief Stasis application support.
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*
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* \author David M. Lee, II <dlee@digium.com>
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*/
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#include "asterisk.h"
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ASTERISK_REGISTER_FILE()
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#include "app.h"
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#include "control.h"
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#include "messaging.h"
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#include "asterisk/callerid.h"
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#include "asterisk/stasis_app.h"
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#include "asterisk/stasis_bridges.h"
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#include "asterisk/stasis_channels.h"
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#include "asterisk/stasis_endpoints.h"
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#include "asterisk/stasis_message_router.h"
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static int unsubscribe(struct stasis_app *app, const char *kind, const char *id, int terminate);
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struct stasis_app {
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/*! Aggregation topic for this application. */
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struct stasis_topic *topic;
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/*! Router for handling messages forwarded to \a topic. */
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struct stasis_message_router *router;
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/*! Router for handling messages to the bridge all \a topic. */
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struct stasis_message_router *bridge_router;
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/*! Container of the channel forwards to this app's topic. */
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struct ao2_container *forwards;
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/*! Callback function for this application. */
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stasis_app_cb handler;
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/*! Opaque data to hand to callback function. */
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void *data;
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/*! Name of the Stasis application */
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char name[];
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};
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enum forward_type {
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FORWARD_CHANNEL,
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FORWARD_BRIDGE,
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FORWARD_ENDPOINT,
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};
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/*! Subscription info for a particular channel/bridge. */
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struct app_forwards {
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/*! Count of number of times this channel/bridge has been subscribed */
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int interested;
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/*! Forward for the regular topic */
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struct stasis_forward *topic_forward;
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/*! Forward for the caching topic */
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struct stasis_forward *topic_cached_forward;
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/* Type of object being forwarded */
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enum forward_type forward_type;
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/*! Unique id of the object being forwarded */
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char id[];
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};
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static void forwards_dtor(void *obj)
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{
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#ifdef AST_DEVMODE
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struct app_forwards *forwards = obj;
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#endif /* AST_DEVMODE */
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ast_assert(forwards->topic_forward == NULL);
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ast_assert(forwards->topic_cached_forward == NULL);
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}
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static void forwards_unsubscribe(struct app_forwards *forwards)
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{
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stasis_forward_cancel(forwards->topic_forward);
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forwards->topic_forward = NULL;
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stasis_forward_cancel(forwards->topic_cached_forward);
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forwards->topic_cached_forward = NULL;
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}
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static struct app_forwards *forwards_create(struct stasis_app *app,
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const char *id)
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{
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RAII_VAR(struct app_forwards *, forwards, NULL, ao2_cleanup);
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if (!app || ast_strlen_zero(id)) {
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return NULL;
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}
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forwards = ao2_alloc(sizeof(*forwards) + strlen(id) + 1, forwards_dtor);
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if (!forwards) {
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return NULL;
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}
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strcpy(forwards->id, id);
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ao2_ref(forwards, +1);
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return forwards;
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}
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/*! Forward a channel's topics to an app */
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static struct app_forwards *forwards_create_channel(struct stasis_app *app,
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struct ast_channel *chan)
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{
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RAII_VAR(struct app_forwards *, forwards, NULL, ao2_cleanup);
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if (!app || !chan) {
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return NULL;
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}
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forwards = forwards_create(app, ast_channel_uniqueid(chan));
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if (!forwards) {
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return NULL;
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}
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forwards->forward_type = FORWARD_CHANNEL;
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forwards->topic_forward = stasis_forward_all(ast_channel_topic(chan),
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app->topic);
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if (!forwards->topic_forward) {
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return NULL;
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}
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forwards->topic_cached_forward = stasis_forward_all(
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ast_channel_topic_cached(chan), app->topic);
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if (!forwards->topic_cached_forward) {
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/* Half-subscribed is a bad thing */
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stasis_forward_cancel(forwards->topic_forward);
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forwards->topic_forward = NULL;
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return NULL;
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}
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ao2_ref(forwards, +1);
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return forwards;
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}
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/*! Forward a bridge's topics to an app */
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static struct app_forwards *forwards_create_bridge(struct stasis_app *app,
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struct ast_bridge *bridge)
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{
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RAII_VAR(struct app_forwards *, forwards, NULL, ao2_cleanup);
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if (!app || !bridge) {
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return NULL;
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}
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forwards = forwards_create(app, bridge->uniqueid);
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if (!forwards) {
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return NULL;
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}
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forwards->forward_type = FORWARD_BRIDGE;
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forwards->topic_forward = stasis_forward_all(ast_bridge_topic(bridge),
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app->topic);
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if (!forwards->topic_forward) {
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return NULL;
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}
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forwards->topic_cached_forward = stasis_forward_all(
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ast_bridge_topic_cached(bridge), app->topic);
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if (!forwards->topic_cached_forward) {
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/* Half-subscribed is a bad thing */
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stasis_forward_cancel(forwards->topic_forward);
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forwards->topic_forward = NULL;
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return NULL;
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}
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ao2_ref(forwards, +1);
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return forwards;
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}
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/*! Forward a endpoint's topics to an app */
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static struct app_forwards *forwards_create_endpoint(struct stasis_app *app,
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struct ast_endpoint *endpoint)
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{
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RAII_VAR(struct app_forwards *, forwards, NULL, ao2_cleanup);
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if (!app || !endpoint) {
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return NULL;
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}
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forwards = forwards_create(app, ast_endpoint_get_id(endpoint));
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if (!forwards) {
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return NULL;
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}
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forwards->forward_type = FORWARD_ENDPOINT;
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forwards->topic_forward = stasis_forward_all(ast_endpoint_topic(endpoint),
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app->topic);
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if (!forwards->topic_forward) {
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return NULL;
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}
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forwards->topic_cached_forward = stasis_forward_all(
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ast_endpoint_topic_cached(endpoint), app->topic);
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if (!forwards->topic_cached_forward) {
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/* Half-subscribed is a bad thing */
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stasis_forward_cancel(forwards->topic_forward);
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forwards->topic_forward = NULL;
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return NULL;
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}
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ao2_ref(forwards, +1);
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return forwards;
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}
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static int forwards_sort(const void *obj_left, const void *obj_right, int flags)
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{
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const struct app_forwards *object_left = obj_left;
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const struct app_forwards *object_right = obj_right;
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const char *right_key = obj_right;
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int cmp;
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switch (flags & (OBJ_POINTER | OBJ_KEY | OBJ_PARTIAL_KEY)) {
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case OBJ_POINTER:
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right_key = object_right->id;
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/* Fall through */
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case OBJ_KEY:
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cmp = strcmp(object_left->id, right_key);
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break;
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case OBJ_PARTIAL_KEY:
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/*
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* We could also use a partial key struct containing a length
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* so strlen() does not get called for every comparison instead.
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*/
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cmp = strncmp(object_left->id, right_key, strlen(right_key));
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break;
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default:
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/* Sort can only work on something with a full or partial key. */
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ast_assert(0);
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cmp = 0;
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break;
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}
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return cmp;
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}
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static void app_dtor(void *obj)
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{
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struct stasis_app *app = obj;
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ast_verb(1, "Destroying Stasis app %s\n", app->name);
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ast_assert(app->router == NULL);
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ast_assert(app->bridge_router == NULL);
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ao2_cleanup(app->topic);
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app->topic = NULL;
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ao2_cleanup(app->forwards);
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app->forwards = NULL;
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ao2_cleanup(app->data);
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app->data = NULL;
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}
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static void call_forwarded_handler(struct stasis_app *app, struct stasis_message *message)
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{
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struct ast_multi_channel_blob *payload = stasis_message_data(message);
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struct ast_channel_snapshot *snapshot = ast_multi_channel_blob_get_channel(payload, "forwarded");
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struct ast_channel *chan;
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if (!snapshot) {
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return;
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}
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chan = ast_channel_get_by_name(snapshot->uniqueid);
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if (!chan) {
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return;
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}
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app_subscribe_channel(app, chan);
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ast_channel_unref(chan);
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}
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static void sub_default_handler(void *data, struct stasis_subscription *sub,
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struct stasis_message *message)
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{
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struct stasis_app *app = data;
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RAII_VAR(struct ast_json *, json, NULL, ast_json_unref);
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if (stasis_subscription_final_message(sub, message)) {
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ao2_cleanup(app);
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}
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if (stasis_message_type(message) == ast_channel_dial_type()) {
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call_forwarded_handler(app, message);
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}
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/* By default, send any message that has a JSON representation */
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json = stasis_message_to_json(message, stasis_app_get_sanitizer());
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if (!json) {
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return;
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}
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app_send(app, json);
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}
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/*! \brief Typedef for callbacks that get called on channel snapshot updates */
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typedef struct ast_json *(*channel_snapshot_monitor)(
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struct ast_channel_snapshot *old_snapshot,
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struct ast_channel_snapshot *new_snapshot,
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const struct timeval *tv);
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static struct ast_json *simple_channel_event(
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const char *type,
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struct ast_channel_snapshot *snapshot,
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const struct timeval *tv)
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{
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struct ast_json *json_channel = ast_channel_snapshot_to_json(snapshot, stasis_app_get_sanitizer());
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if (!json_channel) {
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return NULL;
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}
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return ast_json_pack("{s: s, s: o, s: o}",
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"type", type,
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"timestamp", ast_json_timeval(*tv, NULL),
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"channel", json_channel);
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}
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static struct ast_json *channel_created_event(
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struct ast_channel_snapshot *snapshot,
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const struct timeval *tv)
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{
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return simple_channel_event("ChannelCreated", snapshot, tv);
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}
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static struct ast_json *channel_destroyed_event(
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struct ast_channel_snapshot *snapshot,
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const struct timeval *tv)
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{
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struct ast_json *json_channel = ast_channel_snapshot_to_json(snapshot, stasis_app_get_sanitizer());
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if (!json_channel) {
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return NULL;
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}
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return ast_json_pack("{s: s, s: o, s: i, s: s, s: o}",
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"type", "ChannelDestroyed",
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"timestamp", ast_json_timeval(*tv, NULL),
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"cause", snapshot->hangupcause,
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"cause_txt", ast_cause2str(snapshot->hangupcause),
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"channel", json_channel);
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}
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static struct ast_json *channel_state_change_event(
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struct ast_channel_snapshot *snapshot,
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const struct timeval *tv)
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{
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return simple_channel_event("ChannelStateChange", snapshot, tv);
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}
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/*! \brief Handle channel state changes */
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static struct ast_json *channel_state(
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struct ast_channel_snapshot *old_snapshot,
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struct ast_channel_snapshot *new_snapshot,
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const struct timeval *tv)
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{
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struct ast_channel_snapshot *snapshot = new_snapshot ?
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new_snapshot : old_snapshot;
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if (!old_snapshot) {
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return channel_created_event(snapshot, tv);
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} else if (!new_snapshot) {
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return channel_destroyed_event(snapshot, tv);
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} else if (old_snapshot->state != new_snapshot->state) {
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return channel_state_change_event(snapshot, tv);
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}
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return NULL;
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}
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|
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static struct ast_json *channel_dialplan(
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struct ast_channel_snapshot *old_snapshot,
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struct ast_channel_snapshot *new_snapshot,
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const struct timeval *tv)
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{
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struct ast_json *json_channel;
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|
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/* No Newexten event on cache clear or first event */
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if (!old_snapshot || !new_snapshot) {
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return NULL;
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}
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|
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/* Empty application is not valid for a Newexten event */
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if (ast_strlen_zero(new_snapshot->appl)) {
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return NULL;
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}
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|
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if (ast_channel_snapshot_cep_equal(old_snapshot, new_snapshot)) {
|
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return NULL;
|
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}
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|
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json_channel = ast_channel_snapshot_to_json(new_snapshot, stasis_app_get_sanitizer());
|
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if (!json_channel) {
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return NULL;
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}
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return ast_json_pack("{s: s, s: o, s: s, s: s, s: o}",
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"type", "ChannelDialplan",
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"timestamp", ast_json_timeval(*tv, NULL),
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"dialplan_app", new_snapshot->appl,
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"dialplan_app_data", new_snapshot->data,
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"channel", json_channel);
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}
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|
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static struct ast_json *channel_callerid(
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struct ast_channel_snapshot *old_snapshot,
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struct ast_channel_snapshot *new_snapshot,
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const struct timeval *tv)
|
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{
|
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struct ast_json *json_channel;
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|
|
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/* No NewCallerid event on cache clear or first event */
|
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if (!old_snapshot || !new_snapshot) {
|
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return NULL;
|
|
}
|
|
|
|
if (ast_channel_snapshot_caller_id_equal(old_snapshot, new_snapshot)) {
|
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return NULL;
|
|
}
|
|
|
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json_channel = ast_channel_snapshot_to_json(new_snapshot, stasis_app_get_sanitizer());
|
|
if (!json_channel) {
|
|
return NULL;
|
|
}
|
|
|
|
return ast_json_pack("{s: s, s: o, s: i, s: s, s: o}",
|
|
"type", "ChannelCallerId",
|
|
"timestamp", ast_json_timeval(*tv, NULL),
|
|
"caller_presentation", new_snapshot->caller_pres,
|
|
"caller_presentation_txt", ast_describe_caller_presentation(
|
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new_snapshot->caller_pres),
|
|
"channel", json_channel);
|
|
}
|
|
|
|
static struct ast_json *channel_connected_line(
|
|
struct ast_channel_snapshot *old_snapshot,
|
|
struct ast_channel_snapshot *new_snapshot,
|
|
const struct timeval *tv)
|
|
{
|
|
struct ast_json *json_channel;
|
|
|
|
/* No ChannelConnectedLine event on cache clear or first event */
|
|
if (!old_snapshot || !new_snapshot) {
|
|
return NULL;
|
|
}
|
|
|
|
if (ast_channel_snapshot_connected_line_equal(old_snapshot, new_snapshot)) {
|
|
return NULL;
|
|
}
|
|
|
|
json_channel = ast_channel_snapshot_to_json(new_snapshot, stasis_app_get_sanitizer());
|
|
if (!json_channel) {
|
|
return NULL;
|
|
}
|
|
|
|
return ast_json_pack("{s: s, s: o, s: o}",
|
|
"type", "ChannelConnectedLine",
|
|
"timestamp", ast_json_timeval(*tv, NULL),
|
|
"channel", json_channel);
|
|
}
|
|
|
|
static channel_snapshot_monitor channel_monitors[] = {
|
|
channel_state,
|
|
channel_dialplan,
|
|
channel_callerid,
|
|
channel_connected_line,
|
|
};
|
|
|
|
static void sub_channel_update_handler(void *data,
|
|
struct stasis_subscription *sub,
|
|
struct stasis_message *message)
|
|
{
|
|
struct stasis_app *app = data;
|
|
struct stasis_cache_update *update;
|
|
struct ast_channel_snapshot *new_snapshot;
|
|
struct ast_channel_snapshot *old_snapshot;
|
|
const struct timeval *tv;
|
|
int i;
|
|
|
|
ast_assert(stasis_message_type(message) == stasis_cache_update_type());
|
|
|
|
update = stasis_message_data(message);
|
|
|
|
ast_assert(update->type == ast_channel_snapshot_type());
|
|
|
|
new_snapshot = stasis_message_data(update->new_snapshot);
|
|
old_snapshot = stasis_message_data(update->old_snapshot);
|
|
|
|
/* Pull timestamp from the new snapshot, or from the update message
|
|
* when there isn't one. */
|
|
tv = update->new_snapshot ?
|
|
stasis_message_timestamp(update->new_snapshot) :
|
|
stasis_message_timestamp(message);
|
|
|
|
for (i = 0; i < ARRAY_LEN(channel_monitors); ++i) {
|
|
RAII_VAR(struct ast_json *, msg, NULL, ast_json_unref);
|
|
|
|
msg = channel_monitors[i](old_snapshot, new_snapshot, tv);
|
|
if (msg) {
|
|
app_send(app, msg);
|
|
}
|
|
}
|
|
|
|
if (!new_snapshot && old_snapshot) {
|
|
unsubscribe(app, "channel", old_snapshot->uniqueid, 1);
|
|
}
|
|
}
|
|
|
|
static struct ast_json *simple_endpoint_event(
|
|
const char *type,
|
|
struct ast_endpoint_snapshot *snapshot,
|
|
const struct timeval *tv)
|
|
{
|
|
struct ast_json *json_endpoint = ast_endpoint_snapshot_to_json(snapshot, stasis_app_get_sanitizer());
|
|
|
|
if (!json_endpoint) {
|
|
return NULL;
|
|
}
|
|
|
|
return ast_json_pack("{s: s, s: o, s: o}",
|
|
"type", type,
|
|
"timestamp", ast_json_timeval(*tv, NULL),
|
|
"endpoint", json_endpoint);
|
|
}
|
|
|
|
static int message_received_handler(const char *endpoint_id, struct ast_json *json_msg, void *pvt)
|
|
{
|
|
RAII_VAR(struct ast_endpoint_snapshot *, snapshot, NULL, ao2_cleanup);
|
|
struct ast_json *json_endpoint;
|
|
struct stasis_app *app = pvt;
|
|
char *tech;
|
|
char *resource;
|
|
|
|
tech = ast_strdupa(endpoint_id);
|
|
resource = strchr(tech, '/');
|
|
if (resource) {
|
|
resource[0] = '\0';
|
|
resource++;
|
|
}
|
|
|
|
if (ast_strlen_zero(tech) || ast_strlen_zero(resource)) {
|
|
return -1;
|
|
}
|
|
|
|
snapshot = ast_endpoint_latest_snapshot(tech, resource);
|
|
if (!snapshot) {
|
|
return -1;
|
|
}
|
|
|
|
json_endpoint = ast_endpoint_snapshot_to_json(snapshot, stasis_app_get_sanitizer());
|
|
if (!json_endpoint) {
|
|
return -1;
|
|
}
|
|
|
|
app_send(app, ast_json_pack("{s: s, s: o, s: o, s: O}",
|
|
"type", "TextMessageReceived",
|
|
"timestamp", ast_json_timeval(ast_tvnow(), NULL),
|
|
"endpoint", json_endpoint,
|
|
"message", json_msg));
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void sub_endpoint_update_handler(void *data,
|
|
struct stasis_subscription *sub,
|
|
struct stasis_message *message)
|
|
{
|
|
RAII_VAR(struct ast_json *, json, NULL, ast_json_unref);
|
|
struct stasis_app *app = data;
|
|
struct stasis_cache_update *update;
|
|
struct ast_endpoint_snapshot *new_snapshot;
|
|
struct ast_endpoint_snapshot *old_snapshot;
|
|
const struct timeval *tv;
|
|
|
|
ast_assert(stasis_message_type(message) == stasis_cache_update_type());
|
|
|
|
update = stasis_message_data(message);
|
|
|
|
ast_assert(update->type == ast_endpoint_snapshot_type());
|
|
|
|
new_snapshot = stasis_message_data(update->new_snapshot);
|
|
old_snapshot = stasis_message_data(update->old_snapshot);
|
|
|
|
if (new_snapshot) {
|
|
tv = stasis_message_timestamp(update->new_snapshot);
|
|
|
|
json = simple_endpoint_event("EndpointStateChange", new_snapshot, tv);
|
|
if (!json) {
|
|
return;
|
|
}
|
|
|
|
app_send(app, json);
|
|
}
|
|
|
|
if (!new_snapshot && old_snapshot) {
|
|
unsubscribe(app, "endpoint", old_snapshot->id, 1);
|
|
}
|
|
}
|
|
|
|
static struct ast_json *simple_bridge_event(
|
|
const char *type,
|
|
struct ast_bridge_snapshot *snapshot,
|
|
const struct timeval *tv)
|
|
{
|
|
struct ast_json *json_bridge = ast_bridge_snapshot_to_json(snapshot, stasis_app_get_sanitizer());
|
|
if (!json_bridge) {
|
|
return NULL;
|
|
}
|
|
|
|
return ast_json_pack("{s: s, s: o, s: o}",
|
|
"type", type,
|
|
"timestamp", ast_json_timeval(*tv, NULL),
|
|
"bridge", json_bridge);
|
|
}
|
|
|
|
static void sub_bridge_update_handler(void *data,
|
|
struct stasis_subscription *sub,
|
|
struct stasis_message *message)
|
|
{
|
|
RAII_VAR(struct ast_json *, json, NULL, ast_json_unref);
|
|
struct stasis_app *app = data;
|
|
struct stasis_cache_update *update;
|
|
struct ast_bridge_snapshot *new_snapshot;
|
|
struct ast_bridge_snapshot *old_snapshot;
|
|
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());
|
|
|
|
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);
|
|
}
|
|
|
|
if (json) {
|
|
app_send(app, json);
|
|
}
|
|
|
|
if (!new_snapshot && old_snapshot) {
|
|
unsubscribe(app, "bridge", old_snapshot->uniqueid, 1);
|
|
}
|
|
}
|
|
|
|
|
|
/*! \brief Helper function for determining if the application is subscribed to a given entity */
|
|
static int bridge_app_subscribed(struct stasis_app *app, const char *uniqueid)
|
|
{
|
|
struct app_forwards *forwards = NULL;
|
|
|
|
forwards = ao2_find(app->forwards, uniqueid, OBJ_SEARCH_KEY);
|
|
if (!forwards) {
|
|
return 0;
|
|
}
|
|
|
|
ao2_ref(forwards, -1);
|
|
return 1;
|
|
}
|
|
|
|
static void bridge_merge_handler(void *data, struct stasis_subscription *sub,
|
|
struct stasis_message *message)
|
|
{
|
|
struct stasis_app *app = data;
|
|
struct ast_bridge_merge_message *merge;
|
|
|
|
merge = stasis_message_data(message);
|
|
|
|
/* Find out if we're subscribed to either bridge */
|
|
if (bridge_app_subscribed(app, merge->from->uniqueid) ||
|
|
bridge_app_subscribed(app, merge->to->uniqueid)) {
|
|
/* Forward the message to the app */
|
|
stasis_publish(app->topic, message);
|
|
}
|
|
}
|
|
|
|
/*! \brief Callback function for checking if channels in a bridge are subscribed to */
|
|
static int bridge_app_subscribed_involved(struct stasis_app *app, struct ast_bridge_snapshot *snapshot)
|
|
{
|
|
int subscribed = 0;
|
|
struct ao2_iterator iter;
|
|
char *uniqueid;
|
|
|
|
if (bridge_app_subscribed(app, snapshot->uniqueid)) {
|
|
return 1;
|
|
}
|
|
|
|
iter = ao2_iterator_init(snapshot->channels, 0);
|
|
for (; (uniqueid = ao2_iterator_next(&iter)); ao2_ref(uniqueid, -1)) {
|
|
if (bridge_app_subscribed(app, uniqueid)) {
|
|
subscribed = 1;
|
|
ao2_ref(uniqueid, -1);
|
|
break;
|
|
}
|
|
}
|
|
ao2_iterator_destroy(&iter);
|
|
|
|
return subscribed;
|
|
}
|
|
|
|
static void bridge_blind_transfer_handler(void *data, struct stasis_subscription *sub,
|
|
struct stasis_message *message)
|
|
{
|
|
struct stasis_app *app = data;
|
|
struct ast_blind_transfer_message *transfer_msg = stasis_message_data(message);
|
|
struct ast_bridge_snapshot *bridge = transfer_msg->bridge;
|
|
|
|
if (bridge_app_subscribed(app, transfer_msg->transferer->uniqueid) ||
|
|
(bridge && bridge_app_subscribed_involved(app, bridge))) {
|
|
stasis_publish(app->topic, message);
|
|
}
|
|
}
|
|
|
|
static void bridge_attended_transfer_handler(void *data, struct stasis_subscription *sub,
|
|
struct stasis_message *message)
|
|
{
|
|
struct stasis_app *app = data;
|
|
struct ast_attended_transfer_message *transfer_msg = stasis_message_data(message);
|
|
int subscribed = 0;
|
|
|
|
subscribed = bridge_app_subscribed(app, transfer_msg->to_transferee.channel_snapshot->uniqueid);
|
|
if (!subscribed) {
|
|
subscribed = bridge_app_subscribed(app, transfer_msg->to_transfer_target.channel_snapshot->uniqueid);
|
|
}
|
|
if (!subscribed && transfer_msg->to_transferee.bridge_snapshot) {
|
|
subscribed = bridge_app_subscribed_involved(app, transfer_msg->to_transferee.bridge_snapshot);
|
|
}
|
|
if (!subscribed && transfer_msg->to_transfer_target.bridge_snapshot) {
|
|
subscribed = bridge_app_subscribed_involved(app, transfer_msg->to_transfer_target.bridge_snapshot);
|
|
}
|
|
|
|
if (!subscribed) {
|
|
switch (transfer_msg->dest_type) {
|
|
case AST_ATTENDED_TRANSFER_DEST_BRIDGE_MERGE:
|
|
subscribed = bridge_app_subscribed(app, transfer_msg->dest.bridge);
|
|
break;
|
|
case AST_ATTENDED_TRANSFER_DEST_LINK:
|
|
subscribed = bridge_app_subscribed(app, transfer_msg->dest.links[0]->uniqueid);
|
|
if (!subscribed) {
|
|
subscribed = bridge_app_subscribed(app, transfer_msg->dest.links[1]->uniqueid);
|
|
}
|
|
break;
|
|
break;
|
|
case AST_ATTENDED_TRANSFER_DEST_THREEWAY:
|
|
subscribed = bridge_app_subscribed_involved(app, transfer_msg->dest.threeway.bridge_snapshot);
|
|
if (!subscribed) {
|
|
subscribed = bridge_app_subscribed(app, transfer_msg->dest.threeway.channel_snapshot->uniqueid);
|
|
}
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (subscribed) {
|
|
stasis_publish(app->topic, message);
|
|
}
|
|
}
|
|
|
|
static void bridge_default_handler(void *data, struct stasis_subscription *sub,
|
|
struct stasis_message *message)
|
|
{
|
|
struct stasis_app *app = data;
|
|
|
|
if (stasis_subscription_final_message(sub, message)) {
|
|
ao2_cleanup(app);
|
|
}
|
|
}
|
|
|
|
struct stasis_app *app_create(const char *name, stasis_app_cb handler, void *data)
|
|
{
|
|
RAII_VAR(struct stasis_app *, app, NULL, ao2_cleanup);
|
|
size_t size;
|
|
int res = 0;
|
|
|
|
ast_assert(name != NULL);
|
|
ast_assert(handler != NULL);
|
|
|
|
ast_verb(1, "Creating Stasis app '%s'\n", name);
|
|
|
|
size = sizeof(*app) + strlen(name) + 1;
|
|
app = ao2_alloc_options(size, app_dtor, AO2_ALLOC_OPT_LOCK_MUTEX);
|
|
|
|
if (!app) {
|
|
return NULL;
|
|
}
|
|
|
|
app->forwards = ao2_container_alloc_rbtree(AO2_ALLOC_OPT_LOCK_MUTEX,
|
|
AO2_CONTAINER_ALLOC_OPT_DUPS_OBJ_REJECT,
|
|
forwards_sort, NULL);
|
|
if (!app->forwards) {
|
|
return NULL;
|
|
}
|
|
|
|
app->topic = stasis_topic_create(name);
|
|
if (!app->topic) {
|
|
return NULL;
|
|
}
|
|
|
|
app->bridge_router = stasis_message_router_create(ast_bridge_topic_all());
|
|
if (!app->bridge_router) {
|
|
return NULL;
|
|
}
|
|
|
|
res |= stasis_message_router_add(app->bridge_router,
|
|
ast_bridge_merge_message_type(), bridge_merge_handler, app);
|
|
|
|
res |= stasis_message_router_add(app->bridge_router,
|
|
ast_blind_transfer_type(), bridge_blind_transfer_handler, app);
|
|
|
|
res |= stasis_message_router_add(app->bridge_router,
|
|
ast_attended_transfer_type(), bridge_attended_transfer_handler, app);
|
|
|
|
res |= stasis_message_router_set_default(app->bridge_router,
|
|
bridge_default_handler, app);
|
|
|
|
if (res != 0) {
|
|
return NULL;
|
|
}
|
|
/* Bridge router holds a reference */
|
|
ao2_ref(app, +1);
|
|
|
|
app->router = stasis_message_router_create(app->topic);
|
|
if (!app->router) {
|
|
return NULL;
|
|
}
|
|
|
|
res |= stasis_message_router_add_cache_update(app->router,
|
|
ast_bridge_snapshot_type(), sub_bridge_update_handler, app);
|
|
|
|
res |= stasis_message_router_add_cache_update(app->router,
|
|
ast_channel_snapshot_type(), sub_channel_update_handler, app);
|
|
|
|
res |= stasis_message_router_add_cache_update(app->router,
|
|
ast_endpoint_snapshot_type(), sub_endpoint_update_handler, app);
|
|
|
|
res |= stasis_message_router_set_default(app->router,
|
|
sub_default_handler, app);
|
|
|
|
if (res != 0) {
|
|
return NULL;
|
|
}
|
|
/* Router holds a reference */
|
|
ao2_ref(app, +1);
|
|
|
|
strncpy(app->name, name, size - sizeof(*app));
|
|
app->handler = handler;
|
|
app->data = ao2_bump(data);
|
|
|
|
ao2_ref(app, +1);
|
|
return app;
|
|
}
|
|
|
|
struct stasis_topic *ast_app_get_topic(struct stasis_app *app) {
|
|
return app->topic;
|
|
}
|
|
|
|
/*!
|
|
* \brief Send a message to the given application.
|
|
* \param app App to send the message to.
|
|
* \param message Message to send.
|
|
*/
|
|
void app_send(struct stasis_app *app, struct ast_json *message)
|
|
{
|
|
stasis_app_cb handler;
|
|
RAII_VAR(void *, data, NULL, ao2_cleanup);
|
|
|
|
/* Copy off mutable state with lock held */
|
|
{
|
|
SCOPED_AO2LOCK(lock, app);
|
|
handler = app->handler;
|
|
if (app->data) {
|
|
ao2_ref(app->data, +1);
|
|
data = app->data;
|
|
}
|
|
/* Name is immutable; no need to copy */
|
|
}
|
|
|
|
if (!handler) {
|
|
ast_verb(3,
|
|
"Inactive Stasis app '%s' missed message\n", app->name);
|
|
return;
|
|
}
|
|
|
|
handler(data, app->name, message);
|
|
}
|
|
|
|
void app_deactivate(struct stasis_app *app)
|
|
{
|
|
SCOPED_AO2LOCK(lock, app);
|
|
ast_verb(1, "Deactivating Stasis app '%s'\n", app->name);
|
|
app->handler = NULL;
|
|
ao2_cleanup(app->data);
|
|
app->data = NULL;
|
|
}
|
|
|
|
void app_shutdown(struct stasis_app *app)
|
|
{
|
|
SCOPED_AO2LOCK(lock, app);
|
|
|
|
ast_assert(app_is_finished(app));
|
|
|
|
stasis_message_router_unsubscribe(app->router);
|
|
app->router = NULL;
|
|
stasis_message_router_unsubscribe(app->bridge_router);
|
|
app->bridge_router = NULL;
|
|
}
|
|
|
|
int app_is_active(struct stasis_app *app)
|
|
{
|
|
SCOPED_AO2LOCK(lock, app);
|
|
return app->handler != NULL;
|
|
}
|
|
|
|
int app_is_finished(struct stasis_app *app)
|
|
{
|
|
SCOPED_AO2LOCK(lock, app);
|
|
|
|
return app->handler == NULL && ao2_container_count(app->forwards) == 0;
|
|
}
|
|
|
|
void app_update(struct stasis_app *app, stasis_app_cb handler, void *data)
|
|
{
|
|
SCOPED_AO2LOCK(lock, app);
|
|
|
|
if (app->handler && app->data) {
|
|
RAII_VAR(struct ast_json *, msg, NULL, ast_json_unref);
|
|
|
|
ast_verb(1, "Replacing Stasis app '%s'\n", app->name);
|
|
|
|
msg = ast_json_pack("{s: s, s: s}",
|
|
"type", "ApplicationReplaced",
|
|
"application", app->name);
|
|
if (msg) {
|
|
app_send(app, msg);
|
|
}
|
|
} else {
|
|
ast_verb(1, "Activating Stasis app '%s'\n", app->name);
|
|
}
|
|
|
|
app->handler = handler;
|
|
ao2_cleanup(app->data);
|
|
if (data) {
|
|
ao2_ref(data, +1);
|
|
}
|
|
app->data = data;
|
|
}
|
|
|
|
const char *app_name(const struct stasis_app *app)
|
|
{
|
|
return app->name;
|
|
}
|
|
|
|
struct ast_json *app_to_json(const struct stasis_app *app)
|
|
{
|
|
RAII_VAR(struct ast_json *, json, NULL, ast_json_unref);
|
|
struct ast_json *channels;
|
|
struct ast_json *bridges;
|
|
struct ast_json *endpoints;
|
|
struct ao2_iterator i;
|
|
void *obj;
|
|
|
|
json = ast_json_pack("{s: s, s: [], s: [], s: []}",
|
|
"name", app->name,
|
|
"channel_ids", "bridge_ids", "endpoint_ids");
|
|
channels = ast_json_object_get(json, "channel_ids");
|
|
bridges = ast_json_object_get(json, "bridge_ids");
|
|
endpoints = ast_json_object_get(json, "endpoint_ids");
|
|
|
|
i = ao2_iterator_init(app->forwards, 0);
|
|
while ((obj = ao2_iterator_next(&i))) {
|
|
RAII_VAR(struct app_forwards *, forwards, obj, ao2_cleanup);
|
|
RAII_VAR(struct ast_json *, id, NULL, ast_json_unref);
|
|
int append_res = -1;
|
|
|
|
id = ast_json_string_create(forwards->id);
|
|
|
|
switch (forwards->forward_type) {
|
|
case FORWARD_CHANNEL:
|
|
append_res = ast_json_array_append(channels,
|
|
ast_json_ref(id));
|
|
break;
|
|
case FORWARD_BRIDGE:
|
|
append_res = ast_json_array_append(bridges,
|
|
ast_json_ref(id));
|
|
break;
|
|
case FORWARD_ENDPOINT:
|
|
append_res = ast_json_array_append(endpoints,
|
|
ast_json_ref(id));
|
|
break;
|
|
}
|
|
|
|
if (append_res != 0) {
|
|
ast_log(LOG_ERROR, "Error building response\n");
|
|
ao2_iterator_destroy(&i);
|
|
return NULL;
|
|
}
|
|
}
|
|
ao2_iterator_destroy(&i);
|
|
|
|
return ast_json_ref(json);
|
|
}
|
|
|
|
int app_subscribe_channel(struct stasis_app *app, struct ast_channel *chan)
|
|
{
|
|
int res;
|
|
|
|
if (!app || !chan) {
|
|
return -1;
|
|
} else {
|
|
RAII_VAR(struct app_forwards *, forwards, NULL, ao2_cleanup);
|
|
SCOPED_AO2LOCK(lock, app->forwards);
|
|
|
|
forwards = ao2_find(app->forwards, ast_channel_uniqueid(chan),
|
|
OBJ_SEARCH_KEY | OBJ_NOLOCK);
|
|
if (!forwards) {
|
|
/* Forwards not found, create one */
|
|
forwards = forwards_create_channel(app, chan);
|
|
if (!forwards) {
|
|
return -1;
|
|
}
|
|
|
|
res = ao2_link_flags(app->forwards, forwards,
|
|
OBJ_NOLOCK);
|
|
if (!res) {
|
|
return -1;
|
|
}
|
|
}
|
|
|
|
++forwards->interested;
|
|
ast_debug(3, "Channel '%s' is %d interested in %s\n", ast_channel_uniqueid(chan), forwards->interested, app->name);
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
static int subscribe_channel(struct stasis_app *app, void *obj)
|
|
{
|
|
return app_subscribe_channel(app, obj);
|
|
}
|
|
|
|
static int unsubscribe(struct stasis_app *app, const char *kind, const char *id, int terminate)
|
|
{
|
|
RAII_VAR(struct app_forwards *, forwards, NULL, ao2_cleanup);
|
|
SCOPED_AO2LOCK(lock, app->forwards);
|
|
|
|
forwards = ao2_find(app->forwards, id, OBJ_SEARCH_KEY | OBJ_NOLOCK);
|
|
if (!forwards) {
|
|
ast_debug(3, "App '%s' not subscribed to %s '%s'\n", app->name, kind, id);
|
|
return -1;
|
|
}
|
|
forwards->interested--;
|
|
|
|
ast_debug(3, "%s '%s': is %d interested in %s\n", kind, id, forwards->interested, app->name);
|
|
if (forwards->interested == 0 || terminate) {
|
|
/* No one is interested any more; unsubscribe */
|
|
ast_debug(3, "%s '%s' unsubscribed from %s\n", kind, id, app->name);
|
|
forwards_unsubscribe(forwards);
|
|
ao2_find(app->forwards, forwards,
|
|
OBJ_POINTER | OBJ_NOLOCK | OBJ_UNLINK |
|
|
OBJ_NODATA);
|
|
|
|
if (!strcmp(kind, "endpoint")) {
|
|
messaging_app_unsubscribe_endpoint(app->name, id);
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
int app_unsubscribe_channel(struct stasis_app *app, struct ast_channel *chan)
|
|
{
|
|
if (!app || !chan) {
|
|
return -1;
|
|
}
|
|
|
|
return app_unsubscribe_channel_id(app, ast_channel_uniqueid(chan));
|
|
}
|
|
|
|
int app_unsubscribe_channel_id(struct stasis_app *app, const char *channel_id)
|
|
{
|
|
if (!app || !channel_id) {
|
|
return -1;
|
|
}
|
|
|
|
return unsubscribe(app, "channel", channel_id, 0);
|
|
}
|
|
|
|
int app_is_subscribed_channel_id(struct stasis_app *app, const char *channel_id)
|
|
{
|
|
RAII_VAR(struct app_forwards *, forwards, NULL, ao2_cleanup);
|
|
forwards = ao2_find(app->forwards, channel_id, OBJ_SEARCH_KEY);
|
|
return forwards != NULL;
|
|
}
|
|
|
|
static void *channel_find(const struct stasis_app *app, const char *id)
|
|
{
|
|
return ast_channel_get_by_name(id);
|
|
}
|
|
|
|
struct stasis_app_event_source channel_event_source = {
|
|
.scheme = "channel:",
|
|
.find = channel_find,
|
|
.subscribe = subscribe_channel,
|
|
.unsubscribe = app_unsubscribe_channel_id,
|
|
.is_subscribed = app_is_subscribed_channel_id
|
|
};
|
|
|
|
int app_subscribe_bridge(struct stasis_app *app, struct ast_bridge *bridge)
|
|
{
|
|
if (!app || !bridge) {
|
|
return -1;
|
|
} else {
|
|
RAII_VAR(struct app_forwards *, forwards, NULL, ao2_cleanup);
|
|
SCOPED_AO2LOCK(lock, app->forwards);
|
|
|
|
forwards = ao2_find(app->forwards, bridge->uniqueid,
|
|
OBJ_SEARCH_KEY | OBJ_NOLOCK);
|
|
|
|
if (!forwards) {
|
|
/* Forwards not found, create one */
|
|
forwards = forwards_create_bridge(app, bridge);
|
|
if (!forwards) {
|
|
return -1;
|
|
}
|
|
ao2_link_flags(app->forwards, forwards, OBJ_NOLOCK);
|
|
}
|
|
|
|
++forwards->interested;
|
|
ast_debug(3, "Bridge '%s' is %d interested in %s\n", bridge->uniqueid, forwards->interested, app->name);
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
static int subscribe_bridge(struct stasis_app *app, void *obj)
|
|
{
|
|
return app_subscribe_bridge(app, obj);
|
|
}
|
|
|
|
int app_unsubscribe_bridge(struct stasis_app *app, struct ast_bridge *bridge)
|
|
{
|
|
if (!app || !bridge) {
|
|
return -1;
|
|
}
|
|
|
|
return app_unsubscribe_bridge_id(app, bridge->uniqueid);
|
|
}
|
|
|
|
int app_unsubscribe_bridge_id(struct stasis_app *app, const char *bridge_id)
|
|
{
|
|
if (!app || !bridge_id) {
|
|
return -1;
|
|
}
|
|
|
|
return unsubscribe(app, "bridge", bridge_id, 0);
|
|
}
|
|
|
|
int app_is_subscribed_bridge_id(struct stasis_app *app, const char *bridge_id)
|
|
{
|
|
RAII_VAR(struct app_forwards *, forwards, NULL, ao2_cleanup);
|
|
forwards = ao2_find(app->forwards, bridge_id, OBJ_SEARCH_KEY);
|
|
return forwards != NULL;
|
|
}
|
|
|
|
static void *bridge_find(const struct stasis_app *app, const char *id)
|
|
{
|
|
return stasis_app_bridge_find_by_id(id);
|
|
}
|
|
|
|
struct stasis_app_event_source bridge_event_source = {
|
|
.scheme = "bridge:",
|
|
.find = bridge_find,
|
|
.subscribe = subscribe_bridge,
|
|
.unsubscribe = app_unsubscribe_bridge_id,
|
|
.is_subscribed = app_is_subscribed_bridge_id
|
|
};
|
|
|
|
int app_subscribe_endpoint(struct stasis_app *app, struct ast_endpoint *endpoint)
|
|
{
|
|
if (!app || !endpoint) {
|
|
return -1;
|
|
} else {
|
|
RAII_VAR(struct app_forwards *, forwards, NULL, ao2_cleanup);
|
|
SCOPED_AO2LOCK(lock, app->forwards);
|
|
|
|
forwards = ao2_find(app->forwards, ast_endpoint_get_id(endpoint),
|
|
OBJ_SEARCH_KEY | OBJ_NOLOCK);
|
|
|
|
if (!forwards) {
|
|
/* Forwards not found, create one */
|
|
forwards = forwards_create_endpoint(app, endpoint);
|
|
if (!forwards) {
|
|
return -1;
|
|
}
|
|
ao2_link_flags(app->forwards, forwards, OBJ_NOLOCK);
|
|
|
|
/* Subscribe for messages */
|
|
messaging_app_subscribe_endpoint(app->name, endpoint, &message_received_handler, app);
|
|
}
|
|
|
|
++forwards->interested;
|
|
ast_debug(3, "Endpoint '%s' is %d interested in %s\n", ast_endpoint_get_id(endpoint), forwards->interested, app->name);
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
static int subscribe_endpoint(struct stasis_app *app, void *obj)
|
|
{
|
|
return app_subscribe_endpoint(app, obj);
|
|
}
|
|
|
|
int app_unsubscribe_endpoint_id(struct stasis_app *app, const char *endpoint_id)
|
|
{
|
|
if (!app || !endpoint_id) {
|
|
return -1;
|
|
}
|
|
|
|
return unsubscribe(app, "endpoint", endpoint_id, 0);
|
|
}
|
|
|
|
int app_is_subscribed_endpoint_id(struct stasis_app *app, const char *endpoint_id)
|
|
{
|
|
RAII_VAR(struct app_forwards *, forwards, NULL, ao2_cleanup);
|
|
forwards = ao2_find(app->forwards, endpoint_id, OBJ_SEARCH_KEY);
|
|
return forwards != NULL;
|
|
}
|
|
|
|
static void *endpoint_find(const struct stasis_app *app, const char *id)
|
|
{
|
|
return ast_endpoint_find_by_id(id);
|
|
}
|
|
|
|
struct stasis_app_event_source endpoint_event_source = {
|
|
.scheme = "endpoint:",
|
|
.find = endpoint_find,
|
|
.subscribe = subscribe_endpoint,
|
|
.unsubscribe = app_unsubscribe_endpoint_id,
|
|
.is_subscribed = app_is_subscribed_endpoint_id
|
|
};
|
|
|
|
void stasis_app_register_event_sources(void)
|
|
{
|
|
stasis_app_register_event_source(&channel_event_source);
|
|
stasis_app_register_event_source(&bridge_event_source);
|
|
stasis_app_register_event_source(&endpoint_event_source);
|
|
}
|
|
|
|
int stasis_app_is_core_event_source(struct stasis_app_event_source *obj)
|
|
{
|
|
return obj == &endpoint_event_source ||
|
|
obj == &bridge_event_source ||
|
|
obj == &channel_event_source;
|
|
}
|
|
|
|
void stasis_app_unregister_event_sources(void)
|
|
{
|
|
stasis_app_unregister_event_source(&endpoint_event_source);
|
|
stasis_app_unregister_event_source(&bridge_event_source);
|
|
stasis_app_unregister_event_source(&channel_event_source);
|
|
}
|
|
|
|
|