Moved core logic from app_stasis to res_stasis

After some discussion on asterisk-dev, it was decided that the bulk of
the logic in app_stasis actually belongs in a resource module instead
of the application module.

This patch does that, leaves the app specific stuff in app_stasis, and
fixes up everything else to be consistent with that change.

 * Renamed test_app_stasis to test_res_stasis
 * Renamed app_stasis.h to stasis_app.h
   * This is still stasis application support, even though it's no
     longer in an app_ module. The name should never have been tied to
     the type of module, anyways.
 * Now that json isn't a resource module anymore, moved the
   ast_channel_snapshot_to_json function to main/stasis_channels.c,
   where it makes more sense.

Review: https://reviewboard.asterisk.org/r/2430/


git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@385742 65c4cc65-6c06-0410-ace0-fbb531ad65f3

1 files changed, 148 insertions, 0 deletions

diff --git a/include/asterisk/stasis_app.h b/include/asterisk/stasis_app.h
new file mode 100644
index 000000000..caec19bbc
--- /dev/null
+++ b/include/asterisk/stasis_app.h
@@ -0,0 +1,148 @@
+/*
+ * 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.
+ */
+
+#ifndef _ASTERISK_STASIS_APP_H
+#define _ASTERISK_STASIS_APP_H
+
+/*! \file
+ *
+ * \brief Stasis Application API. See \ref res_stasis "Stasis Application API"
+ * for detailed documentation.
+ *
+ * \author David M. Lee, II <dlee@digium.com>
+ * \since 12
+ *
+ * \page res_stasis Stasis Application API
+ *
+ * This is the API that binds the Stasis dialplan application to external
+ * Stasis applications, such as \c res_stasis_websocket.
+ *
+ * The associated \c res_stasis module registers a dialplan function named \c
+ * Stasis, which uses \c res_stasis to put a channel into the named Stasis
+ * app. As a channel enters and leaves the Stasis diaplan application, the
+ * Stasis app receives a \c 'stasis-start' and \c 'stasis-end' events.
+ *
+ * Stasis apps register themselves using the \ref stasis_app_register and
+ * stasis_app_unregister functions. Messages are sent to an appliction using
+ * \ref stasis_app_send.
+ *
+ * Finally, Stasis apps control channels through the use of the \ref
+ * stasis_app_control object, and the family of \c stasis_app_control_*
+ * functions.
+ */
+
+#include "asterisk/channel.h"
+#include "asterisk/json.h"
+
+struct ast_channel_snapshot;
+
+/*! @{ */
+
+/*!
+ * \brief Control a channel using \c stasis_app.
+ *
+ * This function blocks until the channel hangs up, or
+ * stasis_app_control_continue() is called on the channel's \ref
+ * stasis_app_control struct.
+ *
+ * \param chan Channel to control with Stasis.
+ * \param app_name Application controlling the channel.
+ * \param argc Number of arguments for the application.
+ * \param argv Arguments for the application.
+ */
+int stasis_app_exec(struct ast_channel *chan, const char *app_name, int argc,
+		    char *argv[]);
+
+/*! @} */
+
+/*! @{ */
+
+/*!
+ * \brief Callback for Stasis application handler.
+ *
+ * The message given to the handler is a borrowed copy. If you want to keep a
+ * reference to it, you should use \c ao2_ref() to keep it around.
+ *
+ * \param data Data ptr given when registered.
+ * \param app_name Name of the application being dispatched to.
+ * \param message Message to handle. (borrowed copy)
+ */
+typedef void (*stasis_app_cb)(void *data, const char *app_name,
+			      struct ast_json *message);
+
+/*!
+ * \brief Register a new Stasis application.
+ *
+ * If an application is already registered with the given name, the old
+ * application is sent a 'replaced' message and unregistered.
+ *
+ * \param app_name Name of this application.
+ * \param handler Callback for application messages.
+ * \param data Data blob to pass to the callback. Must be AO2 managed.
+ * \return 0 for success
+ * \return -1 for error.
+ */
+int stasis_app_register(const char *app_name, stasis_app_cb handler, void *data);
+
+/*!
+ * \brief Unregister a Stasis application.
+ * \param app_name Name of the application to unregister.
+ */
+void stasis_app_unregister(const char *app_name);
+
+/*!
+ * \brief Send a message to the given Stasis application.
+ *
+ * The message given to the handler is a borrowed copy. If you want to keep a
+ * reference to it, you should use \c ao2_ref() to keep it around.
+ *
+ * \param app_name Name of the application to invoke.
+ * \param message Message to send (borrowed reference)
+ * \return 0 for success.
+ * \return -1 for error.
+ */
+int stasis_app_send(const char *app_name, struct ast_json *message);
+
+/*! @} */
+
+/*! @{ */
+
+/*! \brief Handler for controlling a channel that's in a Stasis application */
+struct stasis_app_control;
+
+/*!
+ * \brief Returns the handler for the given channel
+ * \param chan Channel to handle.
+ * \return NULL channel not in Stasis application
+ * \return Pointer to stasis handler.
+ */
+struct stasis_app_control *stasis_app_control_find_by_channel(
+	const struct ast_channel *chan);
+
+/*!
+ * \brief Exit \c app_stasis and continue execution in the dialplan.
+ *
+ * If the channel is no longer in \c app_stasis, this function does nothing.
+ *
+ * \param handler Handler for \c app_stasis
+ */
+void stasis_app_control_continue(struct stasis_app_control *handler);
+
+/*! @} */
+
+#endif /* _ASTERISK_STASIS_APP_H */