Migrate a large number of AMI events over to Stasis-Core

This patch moves a number of AMI events over to the Stasis-Core message bus.
This includes:
 * ChanSpyStart/Stop
 * MonitorStart/Stop
 * MusicOnHoldStart/Stop
 * FullyBooted/Reload
 * All Voicemail/MWI related events

In addition, it adds some Stasis-Core and AMI support for generic AMI messages,
refactors the message router in AMI to use a single router with topic
forwarding for the topics that AMI cares about, and refactors MWI message
types and topics to be more name compliant.

Review: https://reviewboard.asterisk.org/r/2532

(closes issue ASTERISK-21462)



git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@389733 65c4cc65-6c06-0410-ace0-fbb531ad65f3

1 files changed, 202 insertions, 0 deletions

diff --git a/main/manager_mwi.c b/main/manager_mwi.c
new file mode 100644
index 000000000..ac629089b
--- /dev/null
+++ b/main/manager_mwi.c
@@ -0,0 +1,202 @@
+/*
+ * Asterisk -- An open source telephony toolkit.
+ *
+ * Copyright (C) 2013, Digium, Inc.
+ *
+ * Matt Jordan <mjordan@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 The Asterisk Management Interface - AMI (MWI event handling)
+ *
+ * \author Matt Jordan <mjordan@digium.com>
+ */
+
+#include "asterisk.h"
+
+ASTERISK_FILE_VERSION(__FILE__, "$Revision$")
+
+#include "asterisk/manager.h"
+#include "asterisk/app.h"
+#include "asterisk/channel.h"
+#include "asterisk/stasis_message_router.h"
+#include "asterisk/stasis.h"
+
+struct stasis_message_router *mwi_state_router;
+
+/*** DOCUMENTATION
+ ***/
+
+/*! \brief The \ref stasis subscription returned by the forwarding of the MWI topic
+ * to the manager topic
+ */
+static struct stasis_subscription *topic_forwarder;
+
+/*! \brief Callback function used by \ref mwi_app_event_cb to weed out "Event" keys */
+static int exclude_event_cb(const char *key)
+{
+	if (!strcmp(key, "Event")) {
+		return -1;
+	}
+	return 0;
+}
+
+/*! \brief Generic MWI event callback used for one-off events from voicemail modules */
+static void mwi_app_event_cb(void *data, struct stasis_subscription *sub,
+				    struct stasis_topic *topic,
+				    struct stasis_message *message)
+{
+	struct ast_mwi_blob *payload = stasis_message_data(message);
+	RAII_VAR(struct ast_str *, channel_event_string, NULL, ast_free);
+	RAII_VAR(struct ast_str *, event_buffer, NULL, ast_free);
+	struct ast_json *event_json = ast_json_object_get(payload->blob, "Event");
+
+	if (!event_json) {
+		return;
+	}
+
+	if (payload->mwi_state && payload->mwi_state->snapshot) {
+		channel_event_string = ast_manager_build_channel_state_string(payload->mwi_state->snapshot);
+	}
+
+	event_buffer = ast_manager_str_from_json_object(payload->blob, exclude_event_cb);
+	if (!event_buffer) {
+		ast_log(AST_LOG_WARNING, "Failed to create payload for event %s\n", ast_json_string_get(event_json));
+		return;
+	}
+
+	manager_event(EVENT_FLAG_CALL, ast_json_string_get(event_json),
+			"Mailbox: %s\r\n"
+			"%s"
+			"%s",
+			payload->mwi_state ? payload->mwi_state->uniqueid : "Unknown",
+			ast_str_buffer(event_buffer),
+			channel_event_string ? ast_str_buffer(channel_event_string) : "");
+}
+
+static void mwi_update_cb(void *data, struct stasis_subscription *sub,
+				    struct stasis_topic *topic,
+				    struct stasis_message *message)
+{
+	struct ast_mwi_state *mwi_state;
+	RAII_VAR(struct ast_str *, channel_event_string, NULL, ast_free);
+
+	if (ast_mwi_state_type() != stasis_message_type(message)) {
+		return;
+	}
+
+	mwi_state = stasis_message_data(message);
+	if (!mwi_state) {
+		return;
+	}
+
+	if (mwi_state->snapshot) {
+		channel_event_string = ast_manager_build_channel_state_string(mwi_state->snapshot);
+	}
+
+	/*** DOCUMENTATION
+		<managerEventInstance>
+			<synopsis>Raised when the state of messages in a voicemail mailbox
+			has changed or when a channel has finished interacting with a
+			mailbox.</synopsis>
+			<syntax>
+				<xi:include xpointer="xpointer(/docs/managerEvent[@name='Newchannel']/managerEventInstance/syntax/parameter)" />
+				<parameter name="Mailbox">
+					<para>The mailbox with the new message, specified as <literal>mailbox</literal>@<literal>context</literal></para>
+				</parameter>
+				<parameter name="Waiting">
+					<para>Whether or not the mailbox has messages waiting for it.</para>
+				</parameter>
+				<parameter name="New">
+					<para>The number of new messages.</para>
+				</parameter>
+				<parameter name="Old">
+					<para>The number of old messages.</para>
+				</parameter>
+			</syntax>
+			<description>
+				<note><para>The Channel related parameters are only present if a
+				channel was involved in the manipulation of a mailbox. If no
+				channel is involved, the parameters are not included with the
+				event.</para>
+				</note>
+			</description>
+		</managerEventInstance>
+	***/
+	manager_event(EVENT_FLAG_CALL, "MessageWaiting",
+			"%s"
+			"Mailbox: %s\r\n"
+			"Waiting: %d\r\n"
+			"New: %d\r\n"
+			"Old: %d\r\n",
+			AS_OR(channel_event_string, ""),
+			mwi_state->uniqueid,
+			ast_app_has_voicemail(mwi_state->uniqueid, NULL),
+			mwi_state->new_msgs,
+			mwi_state->old_msgs);
+}
+
+static void manager_mwi_shutdown(void)
+{
+	stasis_unsubscribe(topic_forwarder);
+	topic_forwarder = NULL;
+}
+
+int manager_mwi_init(void)
+{
+	int ret = 0;
+	struct stasis_topic *manager_topic;
+	struct stasis_topic *mwi_topic;
+	struct stasis_message_router *message_router;
+
+	manager_topic = ast_manager_get_topic();
+	if (!manager_topic) {
+		return -1;
+	}
+	message_router = ast_manager_get_message_router();
+	if (!message_router) {
+		return -1;
+	}
+	mwi_topic = ast_mwi_topic_all();
+	if (!mwi_topic) {
+		return -1;
+	}
+
+	topic_forwarder = stasis_forward_all(mwi_topic, manager_topic);
+	if (!topic_forwarder) {
+		return -1;
+	}
+
+	ast_register_atexit(manager_mwi_shutdown);
+
+	ret |= stasis_message_router_add(message_router,
+					 ast_mwi_state_type(),
+					 mwi_update_cb,
+					 NULL);
+
+	ret |= stasis_message_router_add(message_router,
+					 ast_mwi_vm_app_type(),
+					 mwi_app_event_cb,
+					 NULL);
+
+	/* If somehow we failed to add any routes, just shut down the whole
+	 * thing and fail it.
+	 */
+	if (ret) {
+		manager_mwi_shutdown();
+		return -1;
+	}
+
+	return 0;
+}