bridge_channel: Support the lonely flag and make ARI use it.

The lonely flag is an optional flag for bridge channels that will
make them leave a bridge when a channel leaves if only lonely
channels are in the bridge at that point. This is useful for things
like ending recording and playback channels when they cease to be
interacting with other channels in the bridge.

(closes issue ASTERISK-22117)
Reported by: Matt Jordan
Review: https://reviewboard.asterisk.org/r/2721/


git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@396497 65c4cc65-6c06-0410-ace0-fbb531ad65f3

1 files changed, 12 insertions, 1 deletions

diff --git a/main/bridge_channel.c b/main/bridge_channel.c
index c782ec67d..830abb750 100644
--- a/main/bridge_channel.c
+++ b/main/bridge_channel.c
@@ -1324,7 +1324,12 @@ static void bridge_channel_dissolve_check(struct ast_bridge_channel *bridge_chan
 	default:
 		break;
 	}
-/* BUGBUG need to implement AST_BRIDGE_CHANNEL_FLAG_LONELY support here */
+
+	if (bridge->num_lonely && bridge->num_lonely == bridge->num_channels) {
+		/* This will start a chain reaction where each channel leaving enters this function and causes
+		 * the next to leave as long as there aren't non-lonely channels in the bridge. */
+		ast_bridge_channel_leave_bridge(AST_LIST_FIRST(&bridge->channels), BRIDGE_CHANNEL_STATE_END_NO_DISSOLVE);
+	}
 }
 
 void bridge_channel_internal_pull(struct ast_bridge_channel *bridge_channel)
@@ -1361,6 +1366,9 @@ void bridge_channel_internal_pull(struct ast_bridge_channel *bridge_channel)
 	if (!bridge_channel->suspended) {
 		--bridge->num_active;
 	}
+	if (ast_test_flag(&bridge_channel->features->feature_flags, AST_BRIDGE_CHANNEL_FLAG_LONELY)) {
+		--bridge->num_lonely;
+	}
 	--bridge->num_channels;
 	AST_LIST_REMOVE(&bridge->channels, bridge_channel, entry);
 	bridge->v_table->pull(bridge, bridge_channel);
@@ -1416,6 +1424,9 @@ int bridge_channel_internal_push(struct ast_bridge_channel *bridge_channel)
 	bridge_channel->just_joined = 1;
 	AST_LIST_INSERT_TAIL(&bridge->channels, bridge_channel, entry);
 	++bridge->num_channels;
+	if (ast_test_flag(&bridge_channel->features->feature_flags, AST_BRIDGE_CHANNEL_FLAG_LONELY)) {
+		++bridge->num_lonely;
+	}
 	if (!bridge_channel->suspended) {
 		++bridge->num_active;
 	}