ARI: Add the ability to intercept hold and raise an event

For some applications - such as SLA - a phone pressing hold should not behave
in the fashion that the Asterisk core would like it to. Instead, the hold
action has some application specific behaviour associated with it - such as
disconnecting the channel that initiated the hold; only playing MoH to channels
in the bridge if the channels are of a particular type, etc.

One way of accomplishing this is to use a framehook to intercept the
hold/unhold frames, raise an event, and eat the frame. Tasty. This patch
accomplishes that using a new dialplan function, HOLD_INTERCEPT.

In addition, some general cleanup of raising hold/unhold Stasis messages was
done, including removing some RAII_VAR usage.

Review: https://reviewboard.asterisk.org/r/4549/

ASTERISK-24922 #close


git-svn-id: https://origsvn.digium.com/svn/asterisk/branches/13@434216 65c4cc65-6c06-0410-ace0-fbb531ad65f3

1 files changed, 3 insertions, 1 deletions

diff --git a/main/channel.c b/main/channel.c
index 5efa11870..552f4e0f8 100644
--- a/main/channel.c
+++ b/main/channel.c
@@ -1193,8 +1193,8 @@ int ast_queue_hangup_with_cause(struct ast_channel *chan, int cause)
 
 int ast_queue_hold(struct ast_channel *chan, const char *musicclass)
 {
-	RAII_VAR(struct ast_json *, blob, NULL, ast_json_unref);
 	struct ast_frame f = { AST_FRAME_CONTROL, .subclass.integer = AST_CONTROL_HOLD };
+	struct ast_json *blob = NULL;
 	int res;
 
 	if (!ast_strlen_zero(musicclass)) {
@@ -1209,6 +1209,8 @@ int ast_queue_hold(struct ast_channel *chan, const char *musicclass)
 
 	res = ast_queue_frame(chan, &f);
 
+	ast_json_unref(blob);
+
 	return res;
 }