Rename everything Stasis-HTTP to ARI

This renames all files and API calls from several variants of
Stasis-HTTP to ARI including:
* Stasis-HTTP -> ARI
* STASIS_HTTP -> ARI
* stasis_http -> ari (ast_ari for global symbols, file names as well)
* stasis http -> ARI

Review: https://reviewboard.asterisk.org/r/2706/
(closes issue ASTERISK-22136)


git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@395603 65c4cc65-6c06-0410-ace0-fbb531ad65f3

res/ari/resource_events.c

@@ -0,0 +1,218 @@
+/*
+ * Asterisk -- An open source telephony toolkit.
+ *
+ * Copyright (C) 2012 - 2013, Digium, Inc.
+ *
+ * David M. Lee, II <dlee@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 /api-docs/events.{format} implementation- WebSocket resource
+ *
+ * \author David M. Lee, II <dlee@digium.com>
+ */
+
+#include "asterisk.h"
+
+ASTERISK_FILE_VERSION(__FILE__, "$Revision$")
+
+#include "asterisk/astobj2.h"
+#include "asterisk/stasis_app.h"
+#include "resource_events.h"
+
+/*! Number of buckets for the Stasis application hash table. Remember to keep it
+ *  a prime number!
+ */
+#define APPS_NUM_BUCKETS 7
+
+/*! \brief A connection to the event WebSocket */
+struct event_session {
+	struct ast_ari_websocket_session *ws_session;
+	struct ao2_container *websocket_apps;
+};
+
+/*!
+ * \brief Explicitly shutdown a session.
+ *
+ * An explicit shutdown is necessary, since stasis-app has a reference to this
+ * session. We also need to be sure to null out the \c ws_session field, since
+ * the websocket is about to go away.
+ *
+ * \param session Session info struct.
+ */
+static void session_shutdown(struct event_session *session)
+{
+        struct ao2_iterator i;
+	char *app;
+	SCOPED_AO2LOCK(lock, session);
+
+	i = ao2_iterator_init(session->websocket_apps, 0);
+	while ((app = ao2_iterator_next(&i))) {
+		stasis_app_unregister(app);
+		ao2_cleanup(app);
+	}
+	ao2_iterator_destroy(&i);
+	ao2_cleanup(session->websocket_apps);
+
+	session->websocket_apps = NULL;
+	session->ws_session = NULL;
+}
+
+static void session_dtor(void *obj)
+{
+#ifdef AST_DEVMODE /* Avoid unused variable warning */
+	struct event_session *session = obj;
+#endif
+
+	/* session_shutdown should have been called before */
+	ast_assert(session->ws_session == NULL);
+	ast_assert(session->websocket_apps == NULL);
+}
+
+static void session_cleanup(struct event_session *session)
+{
+	session_shutdown(session);
+	ao2_cleanup(session);
+}
+
+static struct event_session *session_create(
+	struct ast_ari_websocket_session *ws_session)
+{
+	RAII_VAR(struct event_session *, session, NULL, ao2_cleanup);
+
+	session = ao2_alloc(sizeof(*session), session_dtor);
+
+	session->ws_session = ws_session;
+	session->websocket_apps =
+		ast_str_container_alloc(APPS_NUM_BUCKETS);
+
+	if (!session->websocket_apps) {
+		return NULL;
+	}
+
+	ao2_ref(session, +1);
+	return session;
+}
+
+/*!
+ * \brief Callback handler for Stasis application messages.
+ */
+static void app_handler(void *data, const char *app_name,
+			struct ast_json *message)
+{
+	struct event_session *session = data;
+	int res;
+	const char *msg_type = S_OR(
+		ast_json_string_get(ast_json_object_get(message, "type")),
+		"");
+	const char *msg_application = S_OR(
+		ast_json_string_get(ast_json_object_get(message, "application")),
+		"");
+ 
+	/* Determine if we've been replaced */
+	if (strcmp(msg_type, "ApplicationReplaced") == 0 &&
+		strcmp(msg_application, app_name) == 0) {
+		ao2_find(session->websocket_apps, msg_application,
+			OBJ_UNLINK | OBJ_NODATA);
+	}
+
+	res = ast_json_object_set(message, "application",
+				  ast_json_string_create(app_name));
+	if(res != 0) {
+		return;
+	}
+
+	ao2_lock(session);
+	if (session->ws_session) {
+		ast_ari_websocket_session_write(session->ws_session, message);
+	}
+	ao2_unlock(session);
+}
+
+/*!
+ * \brief Register for all of the apps given.
+ * \param session Session info struct.
+ * \param app_list Comma seperated list of app names to register.
+ */
+static int session_register_apps(struct event_session *session,
+				 const char *app_list)
+{
+	RAII_VAR(char *, to_free, NULL, ast_free);
+	char *apps, *app_name;
+	SCOPED_AO2LOCK(lock, session);
+
+	ast_assert(session->ws_session != NULL);
+	ast_assert(session->websocket_apps != NULL);
+
+	if (!app_list) {
+		return -1;
+	}
+
+	to_free = apps = ast_strdup(app_list);
+	if (!apps) {
+		ast_ari_websocket_session_write(session->ws_session, ast_ari_oom_json());
+		return -1;
+	}
+	while ((app_name = strsep(&apps, ","))) {
+		if (ast_str_container_add(session->websocket_apps, app_name)) {
+			ast_ari_websocket_session_write(session->ws_session, ast_ari_oom_json());
+			return -1;
+		}
+
+		stasis_app_register(app_name, app_handler, session);
+	}
+	return 0;
+}
+
+void ast_ari_websocket_event_websocket(struct ast_ari_websocket_session *ws_session,
+	struct ast_variable *headers,
+	struct ast_event_websocket_args *args)
+{
+	RAII_VAR(struct event_session *, session, NULL, session_cleanup);
+	struct ast_json *msg;
+	int res;
+
+	ast_debug(3, "/events WebSocket connection\n");
+
+	session = session_create(ws_session);
+	if (!session) {
+		ast_ari_websocket_session_write(ws_session, ast_ari_oom_json());
+		return;
+	}
+
+	if (!args->app) {
+		RAII_VAR(struct ast_json *, msg, NULL, ast_json_unref);
+
+		msg = ast_json_pack("{s: s, s: [s]}",
+			"type", "MissingParams",
+			"params", "app");
+		if (!msg) {
+			msg = ast_json_ref(ast_ari_oom_json());
+		}
+
+		ast_ari_websocket_session_write(session->ws_session, msg);
+		return;
+	}
+
+	res = session_register_apps(session, args->app);
+	if (res != 0) {
+		ast_ari_websocket_session_write(ws_session, ast_ari_oom_json());
+		return;
+	}
+
+	/* We don't process any input, but we'll consume it waiting for EOF */
+	while ((msg = ast_ari_websocket_session_read(ws_session))) {
+		ast_json_unref(msg);
+	}
+}