int control_add_channel_to_bridge(
struct stasis_app_control *control,
struct ast_channel *chan, void *data)
{
struct ast_bridge *bridge = data;
int res;
if (!control || !bridge) {
return -1;
}
ast_debug(3, "%s: Adding to bridge %s\n",
stasis_app_control_get_channel_id(control),
bridge->uniqueid);
ast_assert(chan != NULL);
/* Depart whatever Stasis bridge we're currently in. */
if (stasis_app_get_bridge(control)) {
/* Note that it looks like there's a race condition here, since
* we don't have control locked. But this happens from the
* control callback thread, so there won't be any other
* concurrent attempts to bridge.
*/
ast_bridge_depart(chan);
}
res = ast_bridge_set_after_callback(chan, bridge_after_cb,
bridge_after_cb_failed, control);
if (res != 0) {
ast_log(LOG_ERROR, "Error setting after-bridge callback\n");
return -1;
}
{
/* pbx and bridge are modified by the bridging impart thread.
* It shouldn't happen concurrently, but we still need to lock
* for the memory fence.
*/
SCOPED_AO2LOCK(lock, control);
/* Ensure the controlling application is subscribed early enough
* to receive the ChannelEnteredBridge message. This works in concert
* with the subscription handled in the Stasis application execution
* loop */
app_subscribe_bridge(control->app, bridge);
/* Save off the channel's PBX */
ast_assert(control->pbx == NULL);
if (!control->pbx) {
control->pbx = ast_channel_pbx(chan);
ast_channel_pbx_set(chan, NULL);
}
res = ast_bridge_impart(bridge,
chan,
NULL, /* swap channel */
NULL, /* features */
AST_BRIDGE_IMPART_CHAN_DEPARTABLE);
if (res != 0) {
ast_log(LOG_ERROR, "Error adding channel to bridge\n");
ast_channel_pbx_set(chan, control->pbx);
control->pbx = NULL;
return -1;
}
ast_assert(stasis_app_get_bridge(control) == NULL);
control->bridge = bridge;
}
return 0;
}
static int subscribe_bridge(struct stasis_app *app, void *obj)
{
return app_subscribe_bridge(app, obj);
}
int control_swap_channel_in_bridge(struct stasis_app_control *control, struct ast_bridge *bridge, struct ast_channel *chan, struct ast_channel *swap)
{
int res;
struct ast_bridge_features *features;
if (!control || !bridge) {
return -1;
}
ast_debug(3, "%s: Adding to bridge %s\n",
stasis_app_control_get_channel_id(control),
bridge->uniqueid);
ast_assert(chan != NULL);
/* Depart whatever Stasis bridge we're currently in. */
if (stasis_app_get_bridge(control)) {
/* Note that it looks like there's a race condition here, since
* we don't have control locked. But this happens from the
* control callback thread, so there won't be any other
* concurrent attempts to bridge.
*/
ast_bridge_depart(chan);
}
res = ast_bridge_set_after_callback(chan, bridge_after_cb,
bridge_after_cb_failed, control);
if (res != 0) {
ast_log(LOG_ERROR, "Error setting after-bridge callback\n");
return -1;
}
ao2_lock(control);
/* Ensure the controlling application is subscribed early enough
* to receive the ChannelEnteredBridge message. This works in concert
* with the subscription handled in the Stasis application execution
* loop */
app_subscribe_bridge(control->app, bridge);
/* Save off the channel's PBX */
ast_assert(control->pbx == NULL);
if (!control->pbx) {
control->pbx = ast_channel_pbx(chan);
ast_channel_pbx_set(chan, NULL);
}
/* Pull bridge features from the control */
features = control->bridge_features;
control->bridge_features = NULL;
ast_assert(stasis_app_get_bridge(control) == NULL);
/* We need to set control->bridge here since bridge_after_cb may be run
* before ast_bridge_impart returns. bridge_after_cb gets a reason
* code so it can tell if the bridge is actually valid or not.
*/
control->bridge = bridge;
/* We can't be holding the control lock while impart is running
* or we could create a deadlock with bridge_after_cb which also
* tries to lock control.
*/
ao2_unlock(control);
res = ast_bridge_impart(bridge,
chan,
swap,
features, /* features */
AST_BRIDGE_IMPART_CHAN_DEPARTABLE);
if (res != 0) {
/* ast_bridge_impart failed before it could spawn the depart
* thread. The callbacks aren't called in this case.
* The impart could still fail even if ast_bridge_impart returned
* ok but that's handled by bridge_after_cb.
*/
ast_log(LOG_ERROR, "Error adding channel to bridge\n");
ao2_lock(control);
ast_channel_pbx_set(chan, control->pbx);
control->pbx = NULL;
control->bridge = NULL;
ao2_unlock(control);
} else {
ast_channel_lock(chan);
set_interval_hook(chan);
ast_channel_unlock(chan);
}
return res;
}
