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-rw-r--r--trunk/main/autoservice.c252
1 files changed, 252 insertions, 0 deletions
diff --git a/trunk/main/autoservice.c b/trunk/main/autoservice.c
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+/*
+ * Asterisk -- An open source telephony toolkit.
+ *
+ * Copyright (C) 1999 - 2006, Digium, Inc.
+ *
+ * Mark Spencer <markster@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 Automatic channel service routines
+ *
+ * \author Mark Spencer <markster@digium.com>
+ */
+
+#include "asterisk.h"
+
+ASTERISK_FILE_VERSION(__FILE__, "$Revision$")
+
+#include <sys/time.h>
+#include <signal.h>
+
+#include "asterisk/pbx.h"
+#include "asterisk/frame.h"
+#include "asterisk/sched.h"
+#include "asterisk/channel.h"
+#include "asterisk/file.h"
+#include "asterisk/translate.h"
+#include "asterisk/manager.h"
+#include "asterisk/chanvars.h"
+#include "asterisk/linkedlists.h"
+#include "asterisk/indications.h"
+#include "asterisk/lock.h"
+#include "asterisk/utils.h"
+
+#define MAX_AUTOMONS 1500
+
+struct asent {
+ struct ast_channel *chan;
+ /*! This gets incremented each time autoservice gets started on the same
+ * channel. It will ensure that it doesn't actually get stopped until
+ * it gets stopped for the last time. */
+ unsigned int use_count;
+ unsigned int orig_end_dtmf_flag:1;
+ AST_LIST_HEAD_NOLOCK(, ast_frame) dtmf_frames;
+ AST_LIST_ENTRY(asent) list;
+};
+
+static AST_RWLIST_HEAD_STATIC(aslist, asent);
+
+static pthread_t asthread = AST_PTHREADT_NULL;
+
+static void defer_frame(struct ast_channel *chan, struct ast_frame *f)
+{
+ struct ast_frame *dup_f;
+ struct asent *as;
+
+ AST_RWLIST_WRLOCK(&aslist);
+ AST_RWLIST_TRAVERSE(&aslist, as, list) {
+ if (as->chan != chan)
+ continue;
+ if ((dup_f = ast_frdup(f)))
+ AST_LIST_INSERT_TAIL(&as->dtmf_frames, dup_f, frame_list);
+ }
+ AST_RWLIST_UNLOCK(&aslist);
+}
+
+static void *autoservice_run(void *ign)
+{
+ for (;;) {
+ struct ast_channel *mons[MAX_AUTOMONS], *chan;
+ struct asent *as;
+ int x = 0, ms = 500;
+
+ AST_RWLIST_RDLOCK(&aslist);
+ AST_RWLIST_TRAVERSE(&aslist, as, list) {
+ if (!ast_check_hangup(as->chan)) {
+ if (x < MAX_AUTOMONS)
+ mons[x++] = as->chan;
+ else
+ ast_log(LOG_WARNING, "Exceeded maximum number of automatic monitoring events. Fix autoservice.c\n");
+ }
+ }
+ AST_RWLIST_UNLOCK(&aslist);
+
+ if ((chan = ast_waitfor_n(mons, x, &ms))) {
+ struct ast_frame *f = ast_read(chan);
+
+ if (!f) {
+ struct ast_frame hangup_frame = { 0, };
+ /* No frame means the channel has been hung up.
+ * A hangup frame needs to be queued here as ast_waitfor() may
+ * never return again for the condition to be detected outside
+ * of autoservice. So, we'll leave a HANGUP queued up so the
+ * thread in charge of this channel will know. */
+
+ hangup_frame.frametype = AST_FRAME_CONTROL;
+ hangup_frame.subclass = AST_CONTROL_HANGUP;
+
+ defer_frame(chan, &hangup_frame);
+
+ continue;
+ }
+
+ /* Do not add a default entry in this switch statement. Each new
+ * frame type should be addressed directly as to whether it should
+ * be queued up or not. */
+ switch (f->frametype) {
+ /* Save these frames */
+ case AST_FRAME_DTMF_END:
+ case AST_FRAME_CONTROL:
+ case AST_FRAME_TEXT:
+ case AST_FRAME_IMAGE:
+ case AST_FRAME_HTML:
+ defer_frame(chan, f);
+ break;
+
+ /* Throw these frames away */
+ case AST_FRAME_DTMF_BEGIN:
+ case AST_FRAME_VOICE:
+ case AST_FRAME_VIDEO:
+ case AST_FRAME_NULL:
+ case AST_FRAME_IAX:
+ case AST_FRAME_CNG:
+ case AST_FRAME_MODEM:
+ break;
+ }
+
+ if (f)
+ ast_frfree(f);
+ }
+ }
+
+ asthread = AST_PTHREADT_NULL;
+
+ return NULL;
+}
+
+int ast_autoservice_start(struct ast_channel *chan)
+{
+ int res = 0;
+ struct asent *as;
+
+ AST_RWLIST_WRLOCK(&aslist);
+ AST_RWLIST_TRAVERSE(&aslist, as, list) {
+ if (as->chan == chan) {
+ as->use_count++;
+ break;
+ }
+ }
+ AST_RWLIST_UNLOCK(&aslist);
+
+ if (as) {
+ /* Entry exists, autoservice is already handling this channel */
+ return 0;
+ }
+
+ if (!(as = ast_calloc(1, sizeof(*as))))
+ return -1;
+
+ /* New entry created */
+ as->chan = chan;
+ as->use_count = 1;
+
+ ast_channel_lock(chan);
+ as->orig_end_dtmf_flag = ast_test_flag(chan, AST_FLAG_END_DTMF_ONLY) ? 1 : 0;
+ if (!as->orig_end_dtmf_flag)
+ ast_set_flag(chan, AST_FLAG_END_DTMF_ONLY);
+ ast_channel_unlock(chan);
+
+ AST_RWLIST_WRLOCK(&aslist);
+ AST_RWLIST_INSERT_HEAD(&aslist, as, list);
+ AST_RWLIST_UNLOCK(&aslist);
+
+ if (asthread == AST_PTHREADT_NULL) { /* need start the thread */
+ if (ast_pthread_create_background(&asthread, NULL, autoservice_run, NULL)) {
+ ast_log(LOG_WARNING, "Unable to create autoservice thread :(\n");
+ /* There will only be a single member in the list at this point,
+ the one we just added. */
+ AST_RWLIST_WRLOCK(&aslist);
+ AST_RWLIST_REMOVE(&aslist, as, list);
+ AST_RWLIST_UNLOCK(&aslist);
+ free(as);
+ res = -1;
+ } else
+ pthread_kill(asthread, SIGURG);
+ }
+
+ return res;
+}
+
+int ast_autoservice_stop(struct ast_channel *chan)
+{
+ int res = -1;
+ struct asent *as;
+ AST_LIST_HEAD_NOLOCK(, ast_frame) dtmf_frames;
+ struct ast_frame *f;
+ int removed = 0;
+ int orig_end_dtmf_flag = 0;
+
+ AST_LIST_HEAD_INIT_NOLOCK(&dtmf_frames);
+
+ AST_RWLIST_WRLOCK(&aslist);
+ AST_RWLIST_TRAVERSE_SAFE_BEGIN(&aslist, as, list) {
+ if (as->chan == chan) {
+ AST_RWLIST_REMOVE_CURRENT(list);
+ as->use_count--;
+ if (as->use_count)
+ break;
+ AST_LIST_APPEND_LIST(&dtmf_frames, &as->dtmf_frames, frame_list);
+ orig_end_dtmf_flag = as->orig_end_dtmf_flag;
+ ast_free(as);
+ removed = 1;
+ if (!ast_check_hangup(chan))
+ res = 0;
+ break;
+ }
+ }
+ AST_RWLIST_TRAVERSE_SAFE_END;
+
+ if (removed && asthread != AST_PTHREADT_NULL)
+ pthread_kill(asthread, SIGURG);
+
+ AST_RWLIST_UNLOCK(&aslist);
+
+ if (!removed)
+ return 0;
+
+ if (!orig_end_dtmf_flag)
+ ast_clear_flag(chan, AST_FLAG_END_DTMF_ONLY);
+
+ /* Wait for it to un-block */
+ while (ast_test_flag(chan, AST_FLAG_BLOCKING))
+ usleep(1000);
+
+ while ((f = AST_LIST_REMOVE_HEAD(&dtmf_frames, frame_list))) {
+ ast_queue_frame(chan, f);
+ ast_frfree(f);
+ }
+
+ return res;
+}