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287 lines
6.9 KiB
287 lines
6.9 KiB
/*
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* Asterisk -- An open source telephony toolkit.
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*
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* Copyright (C) 1999 - 2008, Digium, Inc.
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*
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* Mark Spencer <markster@digium.com>
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* Russell Bryant <russell@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 Automatic channel service routines
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*
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* \author Mark Spencer <markster@digium.com>
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* \author Russell Bryant <russell@digium.com>
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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 <sys/time.h>
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#include <signal.h>
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#include "asterisk/_private.h" /* prototype for ast_autoservice_init() */
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#include "asterisk/pbx.h"
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#include "asterisk/frame.h"
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#include "asterisk/sched.h"
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#include "asterisk/channel.h"
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#include "asterisk/file.h"
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#include "asterisk/translate.h"
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#include "asterisk/manager.h"
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#include "asterisk/chanvars.h"
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#include "asterisk/linkedlists.h"
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#include "asterisk/indications.h"
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#include "asterisk/lock.h"
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#include "asterisk/utils.h"
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#define MAX_AUTOMONS 1500
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struct asent {
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struct ast_channel *chan;
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/*! This gets incremented each time autoservice gets started on the same
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* channel. It will ensure that it doesn't actually get stopped until
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* it gets stopped for the last time. */
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unsigned int use_count;
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unsigned int orig_end_dtmf_flag:1;
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AST_LIST_HEAD_NOLOCK(, ast_frame) dtmf_frames;
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AST_LIST_ENTRY(asent) list;
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};
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static AST_LIST_HEAD_STATIC(aslist, asent);
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static ast_cond_t as_cond;
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static pthread_t asthread = AST_PTHREADT_NULL;
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static int as_chan_list_state;
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static void defer_frame(struct ast_channel *chan, struct ast_frame *f)
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{
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struct ast_frame *dup_f;
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struct asent *as;
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AST_LIST_LOCK(&aslist);
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AST_LIST_TRAVERSE(&aslist, as, list) {
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if (as->chan != chan)
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continue;
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if ((dup_f = ast_frdup(f)))
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AST_LIST_INSERT_TAIL(&as->dtmf_frames, dup_f, frame_list);
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}
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AST_LIST_UNLOCK(&aslist);
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}
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static void *autoservice_run(void *ign)
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{
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for (;;) {
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struct ast_channel *mons[MAX_AUTOMONS], *chan;
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struct asent *as;
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int x = 0, ms = 500;
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AST_LIST_LOCK(&aslist);
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/* At this point, we know that no channels that have been removed are going
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* to get used again. */
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as_chan_list_state++;
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if (AST_LIST_EMPTY(&aslist))
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ast_cond_wait(&as_cond, &aslist.lock);
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AST_LIST_TRAVERSE(&aslist, as, list) {
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if (!ast_check_hangup(as->chan)) {
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if (x < MAX_AUTOMONS)
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mons[x++] = as->chan;
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else
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ast_log(LOG_WARNING, "Exceeded maximum number of automatic monitoring events. Fix autoservice.c\n");
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}
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}
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AST_LIST_UNLOCK(&aslist);
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if ((chan = ast_waitfor_n(mons, x, &ms))) {
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struct ast_frame *f = ast_read(chan);
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if (!f) {
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struct ast_frame hangup_frame = { 0, };
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/* No frame means the channel has been hung up.
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* A hangup frame needs to be queued here as ast_waitfor() may
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* never return again for the condition to be detected outside
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* of autoservice. So, we'll leave a HANGUP queued up so the
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* thread in charge of this channel will know. */
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hangup_frame.frametype = AST_FRAME_CONTROL;
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hangup_frame.subclass = AST_CONTROL_HANGUP;
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defer_frame(chan, &hangup_frame);
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continue;
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}
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/* Do not add a default entry in this switch statement. Each new
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* frame type should be addressed directly as to whether it should
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* be queued up or not. */
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switch (f->frametype) {
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/* Save these frames */
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case AST_FRAME_DTMF_END:
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case AST_FRAME_CONTROL:
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case AST_FRAME_TEXT:
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case AST_FRAME_IMAGE:
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case AST_FRAME_HTML:
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defer_frame(chan, f);
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break;
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/* Throw these frames away */
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case AST_FRAME_DTMF_BEGIN:
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case AST_FRAME_VOICE:
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case AST_FRAME_VIDEO:
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case AST_FRAME_NULL:
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case AST_FRAME_IAX:
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case AST_FRAME_CNG:
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case AST_FRAME_MODEM:
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break;
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}
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if (f)
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ast_frfree(f);
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}
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}
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asthread = AST_PTHREADT_NULL;
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return NULL;
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}
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int ast_autoservice_start(struct ast_channel *chan)
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{
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int res = 0;
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struct asent *as;
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AST_LIST_LOCK(&aslist);
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AST_LIST_TRAVERSE(&aslist, as, list) {
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if (as->chan == chan) {
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as->use_count++;
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break;
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}
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}
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AST_LIST_UNLOCK(&aslist);
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if (as) {
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/* Entry exists, autoservice is already handling this channel */
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return 0;
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}
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if (!(as = ast_calloc(1, sizeof(*as))))
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return -1;
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/* New entry created */
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as->chan = chan;
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as->use_count = 1;
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ast_channel_lock(chan);
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as->orig_end_dtmf_flag = ast_test_flag(chan, AST_FLAG_END_DTMF_ONLY) ? 1 : 0;
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if (!as->orig_end_dtmf_flag)
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ast_set_flag(chan, AST_FLAG_END_DTMF_ONLY);
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ast_channel_unlock(chan);
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AST_LIST_LOCK(&aslist);
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if (AST_LIST_EMPTY(&aslist))
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ast_cond_signal(&as_cond);
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AST_LIST_INSERT_HEAD(&aslist, as, list);
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AST_LIST_UNLOCK(&aslist);
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if (asthread == AST_PTHREADT_NULL) { /* need start the thread */
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if (ast_pthread_create_background(&asthread, NULL, autoservice_run, NULL)) {
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ast_log(LOG_WARNING, "Unable to create autoservice thread :(\n");
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/* There will only be a single member in the list at this point,
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the one we just added. */
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AST_LIST_LOCK(&aslist);
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AST_LIST_REMOVE(&aslist, as, list);
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AST_LIST_UNLOCK(&aslist);
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free(as);
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res = -1;
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} else
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pthread_kill(asthread, SIGURG);
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}
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return res;
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}
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int ast_autoservice_stop(struct ast_channel *chan)
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{
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int res = -1;
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struct asent *as;
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AST_LIST_HEAD_NOLOCK(, ast_frame) dtmf_frames;
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struct ast_frame *f;
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int removed = 0;
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int orig_end_dtmf_flag = 0;
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int chan_list_state;
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AST_LIST_HEAD_INIT_NOLOCK(&dtmf_frames);
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AST_LIST_LOCK(&aslist);
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/* Save the autoservice channel list state. We _must_ verify that the channel
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* list has been rebuilt before we return. Because, after we return, the channel
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* could get destroyed and we don't want our poor autoservice thread to step on
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* it after its gone! */
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chan_list_state = as_chan_list_state;
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AST_LIST_TRAVERSE_SAFE_BEGIN(&aslist, as, list) {
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if (as->chan == chan) {
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AST_LIST_REMOVE_CURRENT(list);
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as->use_count--;
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if (as->use_count)
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break;
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AST_LIST_APPEND_LIST(&dtmf_frames, &as->dtmf_frames, frame_list);
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orig_end_dtmf_flag = as->orig_end_dtmf_flag;
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ast_free(as);
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removed = 1;
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if (!ast_check_hangup(chan))
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res = 0;
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break;
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}
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}
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AST_LIST_TRAVERSE_SAFE_END;
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if (removed && asthread != AST_PTHREADT_NULL)
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pthread_kill(asthread, SIGURG);
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AST_LIST_UNLOCK(&aslist);
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if (!removed)
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return 0;
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if (!orig_end_dtmf_flag)
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ast_clear_flag(chan, AST_FLAG_END_DTMF_ONLY);
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/* Wait for it to un-block */
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while (ast_test_flag(chan, AST_FLAG_BLOCKING))
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usleep(1000);
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while ((f = AST_LIST_REMOVE_HEAD(&dtmf_frames, frame_list))) {
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ast_queue_frame(chan, f);
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ast_frfree(f);
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}
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while (chan_list_state == as_chan_list_state)
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usleep(1000);
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return res;
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}
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void ast_autoservice_init(void)
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{
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ast_cond_init(&as_cond, NULL);
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}
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