json: Take advantage of new API's.

* Use "o*" format specifier for optional fields in ast_json_party_id.
* Stop using ast_json_deep_copy on immutable objects, it is now thread
  safe to just use ast_json_ref.

Additional changes to ast_json_pack calls in the vicinity:
* Use "O" when an object needs to be bumped.  This was previously
  avoided as it was not thread safe.
* Use "o?" and "O?" to replace NULL with ast_json_null().  The
  "?" is a new feature of ast_json_pack starting with Asterisk 16.

Change-Id: I8382d28d7d83ee0ce13334e51ae45dbc0bdaef48

main/json.c

@@ -21,7 +21,7 @@
  * \brief JSON abstraction layer.
  *
  * This is a very thin wrapper around the Jansson API. For more details on it,
- * see its docs at http://www.digip.org/jansson/doc/2.4/apiref.html.
+ * see its docs at http://www.digip.org/jansson/doc/2.11/apiref.html.
  *
  * \author David M. Lee, II <dlee@digium.com>
  */
@@ -747,37 +747,15 @@ static struct ast_json *json_party_subaddress(struct ast_party_subaddress *subad
 
 struct ast_json *ast_json_party_id(struct ast_party_id *party)
 {
-	RAII_VAR(struct ast_json *, json_party_id, NULL, ast_json_unref);
-	int pres;
+	int pres = ast_party_id_presentation(party);
 
 	/* Combined party presentation */
-	pres = ast_party_id_presentation(party);
-	json_party_id = ast_json_pack("{s: i, s: s}",
+	return ast_json_pack("{s: i, s: s, s: o*, s: o*, s: o*}",
 		"presentation", pres,
-		"presentation_txt", ast_describe_caller_presentation(pres));
-	if (!json_party_id) {
-		return NULL;
-	}
-
-	/* Party number */
-	if (party->number.valid
-		&& ast_json_object_set(json_party_id, "number", json_party_number(&party->number))) {
-		return NULL;
-	}
-
-	/* Party name */
-	if (party->name.valid
-		&& ast_json_object_set(json_party_id, "name", json_party_name(&party->name))) {
-		return NULL;
-	}
-
-	/* Party subaddress */
-	if (party->subaddress.valid
-		&& ast_json_object_set(json_party_id, "subaddress", json_party_subaddress(&party->subaddress))) {
-		return NULL;
-	}
-
-	return ast_json_ref(json_party_id);
+		"presentation_txt", ast_describe_caller_presentation(pres),
+		"number", json_party_number(&party->number),
+		"name", json_party_name(&party->name),
+		"subaddress", json_party_subaddress(&party->subaddress));
 }
 
 enum ast_json_to_ast_vars_code ast_json_to_ast_variables(struct ast_json *json_variables, struct ast_variable **variables)

main/rtp_engine.c

@@ -3430,10 +3430,10 @@ static struct ast_json *rtcp_report_to_json(struct stasis_message *msg,
 		}
 	}
 
-	return ast_json_pack("{s: o, s: o, s: o}",
-		"channel", payload->snapshot ? json_channel : ast_json_null(),
+	return ast_json_pack("{s: o?, s: o, s: O?}",
+		"channel", json_channel,
 		"rtcp_report", json_rtcp_report,
-		"blob", ast_json_deep_copy(payload->blob) ?: ast_json_null());
+		"blob", payload->blob);
 }
 
 static void rtp_rtcp_report_dtor(void *obj)

main/stasis.c

@@ -1368,8 +1368,8 @@ static struct ast_json *multi_user_event_to_json(
 
 	ast_json_object_set(out, "type", ast_json_string_create("ChannelUserevent"));
 	ast_json_object_set(out, "timestamp", ast_json_timeval(*tv, NULL));
-	ast_json_object_set(out, "eventname", ast_json_string_create(ast_json_string_get((ast_json_object_get(blob, "eventname")))));
-	ast_json_object_set(out, "userevent", ast_json_deep_copy(blob));
+	ast_json_object_set(out, "eventname", ast_json_ref(ast_json_object_get(blob, "eventname")));
+	ast_json_object_set(out, "userevent", ast_json_ref(blob));
 
 	for (type = 0; type < STASIS_UMOS_MAX; ++type) {
 		for (i = 0; i < AST_VECTOR_SIZE(&multi->snapshots[type]); ++i) {

res/res_stasis.c

@@ -148,10 +148,10 @@ static struct ast_json *stasis_start_to_json(struct stasis_message *message,
 		return NULL;
 	}
 
-	msg = ast_json_pack("{s: s, s: o, s: o, s: o}",
+	msg = ast_json_pack("{s: s, s: O, s: O, s: o}",
 		"type", "StasisStart",
-		"timestamp", ast_json_copy(ast_json_object_get(payload->blob, "timestamp")),
-		"args", ast_json_deep_copy(ast_json_object_get(payload->blob, "args")),
+		"timestamp", ast_json_object_get(payload->blob, "timestamp"),
+		"args", ast_json_object_get(payload->blob, "args"),
 		"channel", ast_channel_snapshot_to_json(payload->channel, NULL));
 	if (!msg) {
 		ast_log(LOG_ERROR, "Failed to pack JSON for StasisStart message\n");

res/res_stasis_playback.c

@@ -111,9 +111,9 @@ static struct ast_json *playback_to_json(struct stasis_message *message,
 		return NULL;
 	}
 
-	return ast_json_pack("{s: s, s: o}",
+	return ast_json_pack("{s: s, s: O}",
 		"type", type,
-		"playback", ast_json_deep_copy(blob));
+		"playback", blob);
 }
 
 STASIS_MESSAGE_TYPE_DEFN(stasis_app_playback_snapshot_type,

res/res_stasis_recording.c

@@ -89,9 +89,9 @@ static struct ast_json *recording_to_json(struct stasis_message *message,
 		return NULL;
 	}
 
-	return ast_json_pack("{s: s, s: o}",
+	return ast_json_pack("{s: s, s: O}",
 		"type", type,
-		"recording", ast_json_deep_copy(blob));
+		"recording", blob);
 }
 
 STASIS_MESSAGE_TYPE_DEFN(stasis_app_recording_snapshot_type,