745 lines
17 KiB
C
745 lines
17 KiB
C
/*
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* Asterisk -- An open source telephony toolkit.
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*
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* Copyright (C) 2012 - 2013, Digium, Inc.
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*
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* David M. Lee, II <dlee@digium.com>
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*
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* See http://www.asterisk.org for more information about
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* the Asterisk project. Please do not directly contact
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* any of the maintainers of this project for assistance;
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* the project provides a web site, mailing lists and IRC
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* channels for your use.
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*
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* This program is free software, distributed under the terms of
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* the GNU General Public License Version 2. See the LICENSE file
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* at the top of the source tree.
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*/
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/*! \file
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*
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* \brief Stasis application support.
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*
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* \author David M. Lee, II <dlee@digium.com>
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*/
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/*** MODULEINFO
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<support_level>core</support_level>
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***/
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#include "asterisk.h"
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ASTERISK_FILE_VERSION(__FILE__, "$Revision$")
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#include "asterisk/astobj2.h"
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#include "asterisk/channel.h"
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#include "asterisk/lock.h"
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#include "asterisk/module.h"
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#include "asterisk/stasis.h"
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#include "asterisk/stasis_app.h"
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#include "asterisk/stasis_channels.h"
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#include "asterisk/strings.h"
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/*! Time to wait for a frame in the application */
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#define MAX_WAIT_MS 200
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/*!
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* \brief Number of buckets for the Stasis application hash table. Remember to
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* keep it a prime number!
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*/
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#define APPS_NUM_BUCKETS 127
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/*!
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* \brief Number of buckets for the Stasis application hash table. Remember to
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* keep it a prime number!
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*/
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#define CONTROLS_NUM_BUCKETS 127
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/*!
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* \brief Stasis application container. Please call apps_registry() instead of
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* directly accessing.
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*/
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struct ao2_container *__apps_registry;
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struct ao2_container *__app_controls;
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/*! Ref-counting accessor for the stasis applications container */
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static struct ao2_container *apps_registry(void)
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{
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ao2_ref(__apps_registry, +1);
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return __apps_registry;
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}
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static struct ao2_container *app_controls(void)
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{
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ao2_ref(__app_controls, +1);
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return __app_controls;
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}
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struct app {
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/*! Callback function for this application. */
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stasis_app_cb handler;
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/*! Opaque data to hand to callback function. */
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void *data;
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/*! Name of the Stasis application */
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char name[];
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};
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static void app_dtor(void *obj)
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{
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struct app *app = obj;
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ao2_cleanup(app->data);
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app->data = NULL;
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}
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/*! Constructor for \ref app. */
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static struct app *app_create(const char *name, stasis_app_cb handler, void *data)
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{
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struct app *app;
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size_t size;
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ast_assert(name != NULL);
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ast_assert(handler != NULL);
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size = sizeof(*app) + strlen(name) + 1;
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app = ao2_alloc_options(size, app_dtor, AO2_ALLOC_OPT_LOCK_MUTEX);
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if (!app) {
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return NULL;
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}
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strncpy(app->name, name, size - sizeof(*app));
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app->handler = handler;
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ao2_ref(data, +1);
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app->data = data;
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return app;
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}
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/*! AO2 hash function for \ref app */
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static int app_hash(const void *obj, const int flags)
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{
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const struct app *app = obj;
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const char *name = flags & OBJ_KEY ? obj : app->name;
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return ast_str_hash(name);
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}
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/*! AO2 comparison function for \ref app */
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static int app_compare(void *lhs, void *rhs, int flags)
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{
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const struct app *lhs_app = lhs;
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const struct app *rhs_app = rhs;
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const char *rhs_name = flags & OBJ_KEY ? rhs : rhs_app->name;
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if (strcmp(lhs_app->name, rhs_name) == 0) {
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return CMP_MATCH | CMP_STOP;
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} else {
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return 0;
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}
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}
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/*!
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* \brief Send a message to the given application.
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* \param app App to send the message to.
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* \param message Message to send.
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*/
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static void app_send(struct app *app, struct ast_json *message)
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{
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app->handler(app->data, app->name, message);
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}
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typedef void* (*stasis_app_command_cb)(struct stasis_app_control *control,
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struct ast_channel *chan,
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void *data);
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struct stasis_app_command {
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ast_mutex_t lock;
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ast_cond_t condition;
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stasis_app_command_cb callback;
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void *data;
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void *retval;
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int is_done:1;
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};
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static void command_dtor(void *obj)
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{
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struct stasis_app_command *command = obj;
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ast_mutex_destroy(&command->lock);
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ast_cond_destroy(&command->condition);
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}
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static struct stasis_app_command *command_create(stasis_app_command_cb callback,
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void *data)
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{
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RAII_VAR(struct stasis_app_command *, command, NULL, ao2_cleanup);
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command = ao2_alloc(sizeof(*command), command_dtor);
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if (!command) {
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return NULL;
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}
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ast_mutex_init(&command->lock);
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ast_cond_init(&command->condition, 0);
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command->callback = callback;
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command->data = data;
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ao2_ref(command, +1);
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return command;
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}
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static void command_complete(struct stasis_app_command *command, void *retval)
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{
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SCOPED_MUTEX(lock, &command->lock);
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command->is_done = 1;
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command->retval = retval;
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ast_cond_signal(&command->condition);
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}
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static void *wait_for_command(struct stasis_app_command *command)
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{
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SCOPED_MUTEX(lock, &command->lock);
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while (!command->is_done) {
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ast_cond_wait(&command->condition, &command->lock);
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}
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return command->retval;
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}
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struct stasis_app_control {
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/*! Queue of commands to dispatch on the channel */
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struct ao2_container *command_queue;
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/*!
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* When set, /c app_stasis should exit and continue in the dialplan.
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*/
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int continue_to_dialplan:1;
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/*! Uniqueid of the associated channel */
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char channel_id[];
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};
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static struct stasis_app_control *control_create(const char *uniqueid)
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{
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struct stasis_app_control *control;
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size_t size;
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size = sizeof(*control) + strlen(uniqueid) + 1;
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control = ao2_alloc(size, NULL);
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if (!control) {
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return NULL;
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}
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control->command_queue = ao2_container_alloc_list(0, 0, NULL, NULL);
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strncpy(control->channel_id, uniqueid, size - sizeof(*control));
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return control;
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}
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static void *exec_command(struct stasis_app_control *control,
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struct stasis_app_command *command)
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{
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ao2_lock(control);
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ao2_ref(command, +1);
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ao2_link(control->command_queue, command);
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ao2_unlock(control);
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return wait_for_command(command);
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}
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/*! AO2 hash function for \ref stasis_app_control */
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static int control_hash(const void *obj, const int flags)
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{
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const struct stasis_app_control *control = obj;
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const char *id = flags & OBJ_KEY ? obj : control->channel_id;
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return ast_str_hash(id);
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}
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/*! AO2 comparison function for \ref stasis_app_control */
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static int control_compare(void *lhs, void *rhs, int flags)
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{
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const struct stasis_app_control *lhs_control = lhs;
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const struct stasis_app_control *rhs_control = rhs;
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const char *rhs_name =
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flags & OBJ_KEY ? rhs : rhs_control->channel_id;
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if (strcmp(lhs_control->channel_id, rhs_name) == 0) {
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return CMP_MATCH | CMP_STOP;
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} else {
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return 0;
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}
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}
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struct stasis_app_control *stasis_app_control_find_by_channel(
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const struct ast_channel *chan)
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{
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if (chan == NULL) {
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return NULL;
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}
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return stasis_app_control_find_by_channel_id(
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ast_channel_uniqueid(chan));
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}
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struct stasis_app_control *stasis_app_control_find_by_channel_id(
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const char *channel_id)
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{
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RAII_VAR(struct ao2_container *, controls, NULL, ao2_cleanup);
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controls = app_controls();
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return ao2_find(controls, channel_id, OBJ_KEY);
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}
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/*!
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* \brief Test the \c continue_to_dialplan bit for the given \a app.
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*
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* The bit is also reset for the next call.
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*
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* \param app Application to check the \c continue_to_dialplan bit.
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* \return Zero to remain in \c Stasis
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* \return Non-zero to continue in the dialplan
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*/
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static int control_continue_test_and_reset(struct stasis_app_control *control)
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{
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int r;
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SCOPED_AO2LOCK(lock, control);
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r = control->continue_to_dialplan;
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control->continue_to_dialplan = 0;
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return r;
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}
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void stasis_app_control_continue(struct stasis_app_control *control)
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{
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SCOPED_AO2LOCK(lock, control);
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control->continue_to_dialplan = 1;
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}
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static int OK = 0;
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static int FAIL = -1;
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static void *__app_control_answer(struct stasis_app_control *control,
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struct ast_channel *chan, void *data)
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{
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ast_debug(3, "%s: Answering", control->channel_id);
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return __ast_answer(chan, 0, 1) == 0 ? &OK : &FAIL;
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}
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int stasis_app_control_answer(struct stasis_app_control *control)
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{
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RAII_VAR(struct stasis_app_command *, command, NULL, ao2_cleanup);
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int *retval;
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ast_debug(3, "%s: Sending answer command\n", control->channel_id);
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command = command_create(__app_control_answer, NULL);
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retval = exec_command(control, command);
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if (*retval != 0) {
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ast_log(LOG_WARNING, "Failed to answer channel");
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}
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return *retval;
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}
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static struct ast_json *app_event_create(
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const char *event_name,
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const struct ast_channel_snapshot *snapshot,
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const struct ast_json *extra_info)
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{
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RAII_VAR(struct ast_json *, message, NULL, ast_json_unref);
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RAII_VAR(struct ast_json *, event, NULL, ast_json_unref);
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if (extra_info) {
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event = ast_json_deep_copy(extra_info);
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} else {
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event = ast_json_object_create();
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}
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if (snapshot) {
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int ret;
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/* Mustn't already have a channel field */
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ast_assert(ast_json_object_get(event, "channel") == NULL);
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ret = ast_json_object_set(
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event,
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"channel", ast_channel_snapshot_to_json(snapshot));
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if (ret != 0) {
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return NULL;
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}
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}
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message = ast_json_pack("{s: o}", event_name, ast_json_ref(event));
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return ast_json_ref(message);
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}
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static int send_start_msg(struct app *app, struct ast_channel *chan,
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int argc, char *argv[])
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{
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RAII_VAR(struct ast_json *, msg, NULL, ast_json_unref);
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RAII_VAR(struct ast_channel_snapshot *, snapshot, NULL, ao2_cleanup);
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struct ast_json *json_args;
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int i;
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ast_assert(chan != NULL);
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/* Set channel info */
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snapshot = ast_channel_snapshot_create(chan);
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if (!snapshot) {
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return -1;
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}
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msg = ast_json_pack("{s: {s: [], s: o}}",
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"stasis-start",
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"args",
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"channel", ast_channel_snapshot_to_json(snapshot));
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if (!msg) {
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return -1;
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}
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/* Append arguments to args array */
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json_args = ast_json_object_get(
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ast_json_object_get(msg, "stasis-start"),
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"args");
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ast_assert(json_args != NULL);
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for (i = 0; i < argc; ++i) {
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int r = ast_json_array_append(json_args,
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ast_json_string_create(argv[i]));
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if (r != 0) {
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ast_log(LOG_ERROR, "Error appending start message\n");
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return -1;
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}
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}
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app_send(app, msg);
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return 0;
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}
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static int send_end_msg(struct app *app, struct ast_channel *chan)
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{
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RAII_VAR(struct ast_json *, msg, NULL, ast_json_unref);
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RAII_VAR(struct ast_channel_snapshot *, snapshot, NULL, ao2_cleanup);
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ast_assert(chan != NULL);
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/* Set channel info */
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snapshot = ast_channel_snapshot_create(chan);
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if (snapshot == NULL) {
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return -1;
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}
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msg = app_event_create("stasis-end", snapshot, NULL);
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if (!msg) {
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return -1;
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}
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app_send(app, msg);
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return 0;
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}
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static void dtmf_handler(struct app *app, struct ast_channel_blob *obj)
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{
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RAII_VAR(struct ast_json *, extra, NULL, ast_json_unref);
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RAII_VAR(struct ast_json *, msg, NULL, ast_json_unref);
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const char *direction;
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/* To simplify events, we'll only generate on receive */
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direction = ast_json_string_get(
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ast_json_object_get(obj->blob, "direction"));
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if (strcmp("Received", direction) != 0) {
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return;
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}
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extra = ast_json_pack(
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"{s: o}",
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"digit", ast_json_ref(ast_json_object_get(obj->blob, "digit")));
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if (!extra) {
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return;
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}
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msg = app_event_create("dtmf-received", obj->snapshot, extra);
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if (!msg) {
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return;
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}
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app_send(app, msg);
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}
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static void sub_handler(void *data, struct stasis_subscription *sub,
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struct stasis_topic *topic,
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struct stasis_message *message)
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{
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struct app *app = data;
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if (stasis_subscription_final_message(sub, message)) {
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ao2_cleanup(data);
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return;
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}
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if (ast_channel_snapshot_type() == stasis_message_type(message)) {
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RAII_VAR(struct ast_json *, msg, NULL, ast_json_unref);
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struct ast_channel_snapshot *snapshot =
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stasis_message_data(message);
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msg = app_event_create("channel-state-change", snapshot, NULL);
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if (!msg) {
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return;
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}
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app_send(app, msg);
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} else if (ast_channel_dtmf_end_type() == stasis_message_type(message)) {
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/* To simplify events, we'll only generate on DTMF end */
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struct ast_channel_blob *blob = stasis_message_data(message);
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dtmf_handler(app, blob);
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}
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}
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/*!
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* \brief In addition to running ao2_cleanup(), this function also removes the
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* object from the app_controls() container.
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*/
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static void control_unlink(struct stasis_app_control *control)
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{
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RAII_VAR(struct ao2_container *, controls, NULL, ao2_cleanup);
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if (!control) {
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return;
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}
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controls = app_controls();
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ao2_unlink_flags(controls, control,
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OBJ_POINTER | OBJ_UNLINK | OBJ_NODATA);
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ao2_cleanup(control);
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}
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static void dispatch_commands(struct stasis_app_control *control,
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struct ast_channel *chan)
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{
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struct ao2_iterator i;
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void *obj;
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SCOPED_AO2LOCK(lock, control);
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i = ao2_iterator_init(control->command_queue, AO2_ITERATOR_UNLINK);
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while ((obj = ao2_iterator_next(&i))) {
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RAII_VAR(struct stasis_app_command *, command, obj, ao2_cleanup);
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void *retval = command->callback(control, chan, command->data);
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command_complete(command, retval);
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}
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ao2_iterator_destroy(&i);
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}
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/*! /brief Stasis dialplan application callback */
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int stasis_app_exec(struct ast_channel *chan, const char *app_name, int argc,
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char *argv[])
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{
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RAII_VAR(struct ao2_container *, apps, apps_registry(), ao2_cleanup);
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RAII_VAR(struct app *, app, NULL, ao2_cleanup);
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RAII_VAR(struct stasis_app_control *, control, NULL, control_unlink);
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RAII_VAR(struct stasis_subscription *, subscription, NULL,
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stasis_unsubscribe);
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int res = 0;
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int hungup = 0;
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ast_assert(chan != NULL);
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app = ao2_find(apps, app_name, OBJ_KEY);
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|
if (!app) {
|
|
ast_log(LOG_ERROR,
|
|
"Stasis app '%s' not registered\n", app_name);
|
|
return -1;
|
|
}
|
|
|
|
{
|
|
RAII_VAR(struct ao2_container *, controls, NULL, ao2_cleanup);
|
|
|
|
controls = app_controls();
|
|
control = control_create(ast_channel_uniqueid(chan));
|
|
if (!control) {
|
|
ast_log(LOG_ERROR, "Allocated failed\n");
|
|
return -1;
|
|
}
|
|
ao2_link(controls, control);
|
|
}
|
|
|
|
subscription =
|
|
stasis_subscribe(ast_channel_topic(chan), sub_handler, app);
|
|
if (subscription == NULL) {
|
|
ast_log(LOG_ERROR, "Error subscribing app %s to channel %s\n",
|
|
app_name, ast_channel_name(chan));
|
|
return -1;
|
|
}
|
|
ao2_ref(app, +1); /* subscription now has a reference */
|
|
|
|
res = send_start_msg(app, chan, argc, argv);
|
|
if (res != 0) {
|
|
ast_log(LOG_ERROR, "Error sending start message to %s\n", app_name);
|
|
return res;
|
|
}
|
|
|
|
while (1) {
|
|
RAII_VAR(struct ast_frame *, f, NULL, ast_frame_dtor);
|
|
int r;
|
|
|
|
if (hungup) {
|
|
ast_debug(3, "%s: Hangup\n",
|
|
ast_channel_uniqueid(chan));
|
|
break;
|
|
}
|
|
|
|
if (control_continue_test_and_reset(control)) {
|
|
ast_debug(3, "%s: Continue\n",
|
|
ast_channel_uniqueid(chan));
|
|
break;
|
|
}
|
|
|
|
r = ast_waitfor(chan, MAX_WAIT_MS);
|
|
|
|
if (r < 0) {
|
|
ast_debug(3, "%s: Poll error\n",
|
|
ast_channel_uniqueid(chan));
|
|
break;
|
|
}
|
|
|
|
dispatch_commands(control, chan);
|
|
|
|
if (r == 0) {
|
|
/* Timeout */
|
|
continue;
|
|
}
|
|
|
|
f = ast_read(chan);
|
|
if (!f) {
|
|
ast_debug(3, "%s: No more frames. Must be done, I guess.\n", ast_channel_uniqueid(chan));
|
|
break;
|
|
}
|
|
|
|
switch (f->frametype) {
|
|
case AST_FRAME_CONTROL:
|
|
if (f->subclass.integer == AST_CONTROL_HANGUP) {
|
|
hungup = 1;
|
|
}
|
|
break;
|
|
default:
|
|
/* Not handled; discard */
|
|
break;
|
|
}
|
|
}
|
|
|
|
res = send_end_msg(app, chan);
|
|
if (res != 0) {
|
|
ast_log(LOG_ERROR,
|
|
"Error sending end message to %s\n", app_name);
|
|
return res;
|
|
}
|
|
|
|
return res;
|
|
}
|
|
|
|
int stasis_app_send(const char *app_name, struct ast_json *message)
|
|
{
|
|
RAII_VAR(struct ao2_container *, apps, apps_registry(), ao2_cleanup);
|
|
RAII_VAR(struct app *, app, NULL, ao2_cleanup);
|
|
|
|
app = ao2_find(apps, app_name, OBJ_KEY);
|
|
|
|
if (!app) {
|
|
/* XXX We can do a better job handling late binding, queueing up
|
|
* the call for a few seconds to wait for the app to register.
|
|
*/
|
|
ast_log(LOG_WARNING,
|
|
"Stasis app '%s' not registered\n", app_name);
|
|
return -1;
|
|
}
|
|
|
|
app_send(app, message);
|
|
return 0;
|
|
}
|
|
|
|
int stasis_app_register(const char *app_name, stasis_app_cb handler, void *data)
|
|
{
|
|
RAII_VAR(struct ao2_container *, apps, apps_registry(), ao2_cleanup);
|
|
RAII_VAR(struct app *, app, NULL, ao2_cleanup);
|
|
|
|
SCOPED_LOCK(apps_lock, apps, ao2_lock, ao2_unlock);
|
|
|
|
app = ao2_find(apps, app_name, OBJ_KEY | OBJ_NOLOCK);
|
|
|
|
if (app) {
|
|
RAII_VAR(struct ast_json *, msg, NULL, ast_json_unref);
|
|
SCOPED_LOCK(app_lock, app, ao2_lock, ao2_unlock);
|
|
|
|
msg = app_event_create("application-replaced", NULL, NULL);
|
|
app->handler(app->data, app_name, msg);
|
|
|
|
app->handler = handler;
|
|
ao2_cleanup(app->data);
|
|
ao2_ref(data, +1);
|
|
app->data = data;
|
|
} else {
|
|
app = app_create(app_name, handler, data);
|
|
if (app) {
|
|
ao2_link_flags(apps, app, OBJ_NOLOCK);
|
|
} else {
|
|
return -1;
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
void stasis_app_unregister(const char *app_name)
|
|
{
|
|
RAII_VAR(struct ao2_container *, apps, NULL, ao2_cleanup);
|
|
|
|
if (app_name) {
|
|
apps = apps_registry();
|
|
ao2_cleanup(ao2_find(apps, app_name, OBJ_KEY | OBJ_UNLINK));
|
|
}
|
|
}
|
|
|
|
static int load_module(void)
|
|
{
|
|
int r = 0;
|
|
|
|
__apps_registry =
|
|
ao2_container_alloc(APPS_NUM_BUCKETS, app_hash, app_compare);
|
|
if (__apps_registry == NULL) {
|
|
return AST_MODULE_LOAD_FAILURE;
|
|
}
|
|
|
|
__app_controls = ao2_container_alloc(CONTROLS_NUM_BUCKETS,
|
|
control_hash, control_compare);
|
|
if (__app_controls == NULL) {
|
|
return AST_MODULE_LOAD_FAILURE;
|
|
}
|
|
|
|
return r;
|
|
}
|
|
|
|
static int unload_module(void)
|
|
{
|
|
int r = 0;
|
|
|
|
ao2_cleanup(__apps_registry);
|
|
__apps_registry = NULL;
|
|
|
|
ao2_cleanup(__app_controls);
|
|
__app_controls = NULL;
|
|
|
|
return r;
|
|
}
|
|
|
|
AST_MODULE_INFO(ASTERISK_GPL_KEY, AST_MODFLAG_GLOBAL_SYMBOLS,
|
|
"Stasis application support",
|
|
.load = load_module,
|
|
.unload = unload_module);
|