Break res_stasis into smaller files.

When implementing playback for stasis-http, the monolithicedness of
res_stasis really started to get in my way.

This patch breaks the major components of res_stasis.c into individual
files.

 * res/stasis/app.c - Stasis application tracking
 * res/stasis/control.c - Channel control objects
 * res/stasis/command.c - Channel command object

This refactoring also allows res_stasis applications to be loaded as
independent modules, such as the new res_stasis_answer module.

The bulk of this patch is simply moving code from one file to another,
adjusting names and adding accessors as necessary.

Review: https://reviewboard.asterisk.org/r/2530/


git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@388729 65c4cc65-6c06-0410-ace0-fbb531ad65f3

1 files changed, 88 insertions, 0 deletions

diff --git a/include/asterisk/stasis_app_impl.h b/include/asterisk/stasis_app_impl.h
new file mode 100644
index 000000000..d4b467756
--- /dev/null
+++ b/include/asterisk/stasis_app_impl.h
@@ -0,0 +1,88 @@
+/*
+ * Asterisk -- An open source telephony toolkit.
+ *
+ * Copyright (C) 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_RES_STASIS_H
+#define _ASTERISK_RES_STASIS_H
+
+/*! \file
+ *
+ * \brief Backend API for implementing components of res_stasis.
+ *
+ * \author David M. Lee, II <dlee@digium.com>
+ * \since 12
+ *
+ * This file defines functions useful for defining new commands to execute
+ * on channels while they are in Stasis.
+ */
+
+#include "asterisk/stasis_app.h"
+
+/*!
+ * \since 12
+ * \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[]);
+
+/*! Callback type for stasis app commands */
+typedef void *(*stasis_app_command_cb)(struct stasis_app_control *control,
+	struct ast_channel *chan, void *data);
+
+/*!
+ * \since 12
+ * \brief Invokes a \a command on a \a control's channel.
+ *
+ * This function dispatches the command to be executed in the context of
+ * stasis_app_exec(), so this command will block waiting for the results of
+ * the command.
+ *
+ * \param control Control object for the channel to send the command to.
+ * \param command Command function to execute.
+ * \param data Optional data to pass along with the control function.
+ * \return Return value from \a command.
+ * \return \c NULL on error.
+ */
+void *stasis_app_send_command(struct stasis_app_control *control,
+	stasis_app_command_cb command, void *data);
+
+/*!
+ * \since 12
+ * \brief Asynchronous version of stasis_app_send().
+ *
+ * This function enqueues a command for execution, but returns immediately
+ * without waiting for the response.
+ *
+ * \param control Control object for the channel to send the command to.
+ * \param command Command function to execute.
+ * \param data Optional data to pass along with the control function.
+ * \return 0 on success.
+ * \return Non-zero on error.
+ */
+int stasis_app_send_command_async(struct stasis_app_control *control,
+	stasis_app_command_cb command, void *data);
+
+#endif /* _ASTERISK_RES_STASIS_H */