asterisk/res/stasis/stasis_bridge.c

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2023-05-25 18:45:57 +00:00
/*
* Asterisk -- An open source telephony toolkit.
*
* Copyright (C) 2014, Digium, Inc.
*
* Richard Mudgett <rmudgett@digium.com>
*
* See http://www.asterisk.org for more information about
* the Asterisk project. Please do not directly contact
* any of the maintainers of this project for assistance;
* the project provides a web site, mailing lists and IRC
* channels for your use.
*
* This program is free software, distributed under the terms of
* the GNU General Public License Version 2. See the LICENSE file
* at the top of the source tree.
*/
/*!
* \file
* \brief Stasis bridge subclass.
*
* \author Richard Mudgett <rmudgett@digium.com>
*
* See Also:
* \arg \ref AstCREDITS
*/
#include "asterisk.h"
#include "asterisk/bridge.h"
#include "asterisk/bridge_after.h"
#include "asterisk/bridge_internal.h"
#include "asterisk/bridge_features.h"
#include "asterisk/stasis_app.h"
#include "asterisk/stasis_channels.h"
#include "stasis_bridge.h"
#include "control.h"
#include "command.h"
#include "app.h"
#include "asterisk/stasis_app.h"
#include "asterisk/pbx.h"
/* ------------------------------------------------------------------- */
static struct ast_bridge_methods bridge_stasis_v_table;
static void bridge_stasis_run_cb(struct ast_channel *chan, void *data)
{
RAII_VAR(char *, app_name, NULL, ast_free);
struct ast_app *app_stasis;
/* Take ownership of the swap_app memory from the datastore */
app_name = app_get_replace_channel_app(chan);
if (!app_name) {
ast_log(LOG_ERROR, "Failed to get app name for %s (%p)\n", ast_channel_name(chan), chan);
return;
}
/* find Stasis() */
app_stasis = pbx_findapp("Stasis");
if (!app_stasis) {
ast_log(LOG_WARNING, "Could not find application (Stasis)\n");
return;
}
if (ast_check_hangup_locked(chan)) {
/* channel hungup, don't run Stasis() */
return;
}
/* run Stasis() */
pbx_exec(chan, app_stasis, app_name);
}
struct defer_bridge_add_obj {
/*! Bridge to join (has ref) */
struct ast_bridge *bridge;
/*!
* \brief Channel to swap with in the bridge. (has ref)
*
* \note NULL if not swapping with a channel.
*/
struct ast_channel *swap;
};
static void defer_bridge_add_dtor(void *obj)
{
struct defer_bridge_add_obj *defer = obj;
ao2_cleanup(defer->bridge);
ast_channel_cleanup(defer->swap);
}
static int defer_bridge_add(
struct stasis_app_control *control,
struct ast_channel *chan, void *obj)
{
struct defer_bridge_add_obj *defer = obj;
return control_swap_channel_in_bridge(control, defer->bridge, chan, defer->swap);
}
static void bridge_stasis_queue_join_action(struct ast_bridge *self,
struct ast_bridge_channel *bridge_channel, struct ast_bridge_channel *swap)
{
struct defer_bridge_add_obj *defer;
defer = ao2_alloc_options(sizeof(*defer), defer_bridge_add_dtor,
AO2_ALLOC_OPT_LOCK_NOLOCK);
if (!defer) {
return;
}
ao2_ref(self, +1);
defer->bridge = self;
if (swap) {
ast_channel_ref(swap->chan);
defer->swap = swap->chan;
}
ast_channel_lock(bridge_channel->chan);
command_prestart_queue_command(bridge_channel->chan, defer_bridge_add,
defer, __ao2_cleanup);
ast_channel_unlock(bridge_channel->chan);
}
/*!
* \internal
* \brief Peek at channel before it is pushed into bridge
* \since 13.2.0
*
* \param self Bridge to operate upon.
* \param bridge_channel Bridge channel to push.
* \param swap Bridge channel to swap places with if not NULL.
*
* \note On entry, self is already locked.
*
* \retval 0 on success.
* \retval -1 on failure. The channel should not be pushed.
*/
static int bridge_stasis_push_peek(struct ast_bridge *self, struct ast_bridge_channel *bridge_channel, struct ast_bridge_channel *swap)
{
struct stasis_app_control *swap_control;
struct ast_channel_snapshot *to_be_replaced;
if (!swap) {
goto done;
}
swap_control = stasis_app_control_find_by_channel(swap->chan);
if (!swap_control) {
ast_log(LOG_ERROR,"Failed to find stasis app control for swapped channel %s\n", ast_channel_name(swap->chan));
return -1;
}
to_be_replaced = ast_channel_snapshot_get_latest(ast_channel_uniqueid(swap->chan));
ast_debug(3, "Copying stasis app name %s from %s to %s\n", stasis_app_name(control_app(swap_control)),
ast_channel_name(swap->chan), ast_channel_name(bridge_channel->chan));
ast_channel_lock(bridge_channel->chan);
/* copy the app name from the swap channel */
app_set_replace_channel_app(bridge_channel->chan, stasis_app_name(control_app(swap_control)));
/* set the replace channel snapshot */
app_set_replace_channel_snapshot(bridge_channel->chan, to_be_replaced);
ast_channel_unlock(bridge_channel->chan);
ao2_ref(swap_control, -1);
ao2_cleanup(to_be_replaced);
done:
return ast_bridge_base_v_table.push_peek(self, bridge_channel, swap);
}
/*!
* \internal
* \brief Push this channel into the Stasis bridge.
* \since 12.5.0
*
* \param self Bridge to operate upon.
* \param bridge_channel Bridge channel to push.
* \param swap Bridge channel to swap places with if not NULL.
*
* \note On entry, self is already locked.
*
* \retval 0 on success.
* \retval -1 on failure. The channel did not get pushed.
*/
static int bridge_stasis_push(struct ast_bridge *self, struct ast_bridge_channel *bridge_channel, struct ast_bridge_channel *swap)
{
struct stasis_app_control *control = stasis_app_control_find_by_channel(bridge_channel->chan);
if (!control && !stasis_app_channel_is_internal(bridge_channel->chan)) {
/* channel not in Stasis(), get it there */
ast_debug(1, "Bridge %s: pushing non-stasis %p(%s) setup to come back in under stasis\n",
self->uniqueid, bridge_channel, ast_channel_name(bridge_channel->chan));
/* Attach after-bridge callback and pass ownership of swap_app to it */
if (ast_bridge_set_after_callback(bridge_channel->chan,
bridge_stasis_run_cb, NULL, NULL)) {
ast_log(LOG_ERROR,
"Failed to set after bridge callback for bridge %s non-stasis push of %s\n",
self->uniqueid, ast_channel_name(bridge_channel->chan));
return -1;
}
bridge_stasis_queue_join_action(self, bridge_channel, swap);
/* Return -1 so the push fails and the after-bridge callback gets called
* This keeps the bridging framework from putting the channel into the bridge
* until the Stasis thread gets started, and then the channel is put into the bridge.
*/
return -1;
}
ao2_cleanup(control);
/*
* If going into a holding bridge, default the role to participant, if
* it has no compatible role currently
*/
if ((self->technology->capabilities & AST_BRIDGE_CAPABILITY_HOLDING)
&& !ast_channel_has_role(bridge_channel->chan, "announcer")
&& !ast_channel_has_role(bridge_channel->chan, "holding_participant")) {
if (ast_channel_add_bridge_role(bridge_channel->chan, "holding_participant")) {
ast_log(LOG_ERROR, "Failed to set holding participant on %s\n", ast_channel_name(bridge_channel->chan));
return -1;
}
if (ast_channel_set_bridge_role_option(bridge_channel->chan, "holding_participant", "idle_mode", "none")) {
ast_log(LOG_ERROR, "Failed to set holding participant mode on %s\n", ast_channel_name(bridge_channel->chan));
return -1;
}
}
if (self->allowed_capabilities & STASIS_BRIDGE_MIXING_CAPABILITIES) {
ast_bridge_channel_update_linkedids(bridge_channel, swap);
if (ast_test_flag(&self->feature_flags, AST_BRIDGE_FLAG_SMART)) {
ast_bridge_channel_update_accountcodes(bridge_channel, swap);
}
}
return ast_bridge_base_v_table.push(self, bridge_channel, swap);
}
static int bridge_stasis_moving(struct ast_bridge_channel *bridge_channel, void *hook_pvt,
struct ast_bridge *src, struct ast_bridge *dst)
{
if (src->v_table == &bridge_stasis_v_table &&
dst->v_table != &bridge_stasis_v_table) {
struct stasis_app_control *control;
struct ast_channel *chan;
chan = bridge_channel->chan;
ast_assert(chan != NULL);
control = stasis_app_control_find_by_channel(chan);
if (!control) {
return -1;
}
stasis_app_channel_set_stasis_end_published(chan);
app_send_end_msg(control_app(control), chan);
ao2_ref(control, -1);
}
return -1;
}
/*!
* \internal
* \brief Pull this channel from the Stasis bridge.
* \since 12.5.0
*
* \param self Bridge to operate upon.
* \param bridge_channel Bridge channel to pull.
*
* \note On entry, self is already locked.
*/
static void bridge_stasis_pull(struct ast_bridge *self, struct ast_bridge_channel *bridge_channel)
{
if ((self->allowed_capabilities & STASIS_BRIDGE_MIXING_CAPABILITIES)
&& ast_test_flag(&self->feature_flags, AST_BRIDGE_FLAG_SMART)) {
ast_bridge_channel_update_accountcodes(NULL, bridge_channel);
}
if (self->technology->capabilities & AST_BRIDGE_CAPABILITY_HOLDING) {
ast_channel_clear_bridge_roles(bridge_channel->chan);
}
ast_bridge_move_hook(bridge_channel->features, bridge_stasis_moving, NULL, NULL, 0);
ast_bridge_base_v_table.pull(self, bridge_channel);
}
struct ast_bridge *bridge_stasis_new(uint32_t capabilities, unsigned int flags, const char *name, const char *id, enum ast_bridge_video_mode_type video_mode)
{
void *bridge;
bridge = bridge_alloc(sizeof(struct ast_bridge), &bridge_stasis_v_table);
bridge = bridge_base_init(bridge, capabilities, flags, "Stasis", name, id);
if (!bridge) {
return NULL;
}
if (video_mode == AST_BRIDGE_VIDEO_MODE_SFU) {
ast_bridge_set_sfu_video_mode(bridge);
/* We require a minimum 5 seconds between video updates to stop floods from clients,
* this should rarely be changed but should become configurable in the future.
*/
ast_bridge_set_video_update_discard(bridge, 5);
} else if (video_mode == AST_BRIDGE_VIDEO_MODE_SINGLE_SRC) {
ast_bridge_set_single_src_video_mode(bridge, NULL);
} else {
ast_bridge_set_talker_src_video_mode(bridge);
}
bridge = bridge_register(bridge);
return bridge;
}
void bridge_stasis_init(void)
{
/* Setup the Stasis bridge subclass v_table. */
bridge_stasis_v_table = ast_bridge_base_v_table;
bridge_stasis_v_table.name = "stasis";
bridge_stasis_v_table.push = bridge_stasis_push;
bridge_stasis_v_table.pull = bridge_stasis_pull;
bridge_stasis_v_table.push_peek = bridge_stasis_push_peek;
}