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app_confbridge: Repeatedly starting and stopping recording ref leaks the recording channel.

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Starting and stopping conference recording more than once causes the
recording channels to be leaked.  For v13 the channels also show up in the
CLI "core show channels" output.

* Reworked and simplified the recording channel code to use
ast_bridge_impart() instead of managing the recording thread in the
ConfBridge code.  The recording channel's ref handling easily falls into
place and other off nominal code paths get handled better as a result.

ASTERISK-24719 #close
Reported by: John Bigelow

Review: https://reviewboard.asterisk.org/r/4368/
Review: https://reviewboard.asterisk.org/r/4369/
........

Merged revisions 431135 from http://svn.asterisk.org/svn/asterisk/branches/11


git-svn-id: https://origsvn.digium.com/svn/asterisk/branches/13@431160 65c4cc65-6c06-0410-ace0-fbb531ad65f3
changes/43/43/1
Richard Mudgett 10 years ago
parent b64f4bb6ee
commit eda125f98d
2 changed files with 89 additions and 147 deletions
Show Stats Download Patch File Download Diff File

230
apps/app_confbridge.c
Unescape View File

@ -324,14 +324,11 @@ ASTERISK_FILE_VERSION(__FILE__, "$Revision$")
static const char app[] = "ConfBridge";
/* Number of buckets our conference bridges container can have */
/*! Number of buckets our conference bridges container can have */
#define CONFERENCE_BRIDGE_BUCKETS 53
enum {
CONF_RECORD_EXIT = 0,
CONF_RECORD_START,
CONF_RECORD_STOP,
};
/*! Initial recording filename space. */
#define RECORD_FILENAME_INITIAL_SPACE 128
/*! \brief Container to hold all conference bridges in progress */
struct ao2_container *conference_bridges;
@ -591,10 +588,11 @@ static int is_new_rec_file(const char *rec_file, struct ast_str **orig_rec_file)
{
if (!ast_strlen_zero(rec_file)) {
if (!*orig_rec_file) {
*orig_rec_file = ast_str_create(PATH_MAX);
*orig_rec_file = ast_str_create(RECORD_FILENAME_INITIAL_SPACE);
}
if (strcmp(ast_str_buffer(*orig_rec_file), rec_file)) {
if (*orig_rec_file
&& strcmp(ast_str_buffer(*orig_rec_file), rec_file)) {
ast_str_set(orig_rec_file, 0, "%s", rec_file);
return 1;
}
@ -602,79 +600,48 @@ static int is_new_rec_file(const char *rec_file, struct ast_str **orig_rec_file)
return 0;
}
static void *record_thread(void *obj)
{
struct confbridge_conference *conference = obj;
struct ast_app *mixmonapp = pbx_findapp("MixMonitor");
struct ast_channel *chan;
struct ast_str *filename = ast_str_alloca(PATH_MAX);
struct ast_str *orig_rec_file = NULL;
struct ast_bridge_features features;
ast_mutex_lock(&conference->record_lock);
if (!mixmonapp) {
ast_log(LOG_WARNING, "Can not record ConfBridge, MixMonitor app is not installed\n");
conference->record_thread = AST_PTHREADT_NULL;
ast_mutex_unlock(&conference->record_lock);
ao2_ref(conference, -1);
return NULL;
}
if (ast_bridge_features_init(&features)) {
ast_bridge_features_cleanup(&features);
conference->record_thread = AST_PTHREADT_NULL;
ast_mutex_unlock(&conference->record_lock);
ao2_ref(conference, -1);
return NULL;
}
ast_set_flag(&features.feature_flags, AST_BRIDGE_CHANNEL_FLAG_IMMOVABLE);
/* XXX If we get an EXIT right here, START will essentially be a no-op */
while (conference->record_state != CONF_RECORD_EXIT) {
set_rec_filename(conference, &filename,
is_new_rec_file(conference->b_profile.rec_file, &orig_rec_file));
chan = ast_channel_ref(conference->record_chan);
ast_answer(chan);
pbx_exec(chan, mixmonapp, ast_str_buffer(filename));
ast_bridge_join(conference->bridge, chan, NULL, &features, NULL, 0);
ast_hangup(chan); /* This will eat this thread's reference to the channel as well */
/* STOP has been called. Wait for either a START or an EXIT */
ast_cond_wait(&conference->record_cond, &conference->record_lock);
}
ast_bridge_features_cleanup(&features);
ast_free(orig_rec_file);
ast_mutex_unlock(&conference->record_lock);
ao2_ref(conference, -1);
return NULL;
}
/*! \brief Returns whether or not conference is being recorded.
/*!
* \internal
* \brief Returns whether or not conference is being recorded.
*
* \param conference The bridge to check for recording
*
* \note Must be called with the conference locked
*
* \retval 1, conference is recording.
* \retval 0, conference is NOT recording.
*/
static int conf_is_recording(struct confbridge_conference *conference)
{
return conference->record_state == CONF_RECORD_START;
return conference->record_chan != NULL;
}
/*! \brief Stop recording a conference bridge
/*!
* \internal
* \brief Stop recording a conference bridge
*
* \param conference The conference bridge on which to stop the recording
*
* \note Must be called with the conference locked
*
* \retval -1 Failure
* \retval 0 Success
*/
static int conf_stop_record(struct confbridge_conference *conference)
{
struct ast_channel *chan;
if (conference->record_thread == AST_PTHREADT_NULL || !conf_is_recording(conference)) {
struct ast_frame f = { AST_FRAME_CONTROL, .subclass.integer = AST_CONTROL_HANGUP };
if (!conf_is_recording(conference)) {
return -1;
}
conference->record_state = CONF_RECORD_STOP;
chan = ast_channel_ref(conference->record_chan);
ast_bridge_remove(conference->bridge, chan);
ast_queue_frame(chan, &ast_null_frame);
chan = ast_channel_unref(chan);
/* Remove the recording channel from the conference bridge. */
chan = conference->record_chan;
conference->record_chan = NULL;
ast_queue_frame(chan, &f);
ast_channel_unref(chan);
ast_test_suite_event_notify("CONF_STOP_RECORD", "Message: stopped conference recording channel\r\nConference: %s", conference->b_profile.name);
send_stop_record_event(conference);
@ -683,102 +650,73 @@ static int conf_stop_record(struct confbridge_conference *conference)
/*!
* \internal
* \brief Stops the confbridge recording thread.
* \brief Start recording the conference
*
* \note Must be called with the conference locked
*/
static int conf_stop_record_thread(struct confbridge_conference *conference)
{
if (conference->record_thread == AST_PTHREADT_NULL) {
return -1;
}
conf_stop_record(conference);
ast_mutex_lock(&conference->record_lock);
conference->record_state = CONF_RECORD_EXIT;
ast_cond_signal(&conference->record_cond);
ast_mutex_unlock(&conference->record_lock);
pthread_join(conference->record_thread, NULL);
conference->record_thread = AST_PTHREADT_NULL;
/* this is the reference given to the channel during the channel alloc */
if (conference->record_chan) {
conference->record_chan = ast_channel_unref(conference->record_chan);
}
return 0;
}
/*! \brief Start recording the conference
* \internal
* \note The conference must be locked when calling this function
* \param conference The conference bridge to start recording
*
* \note Must be called with the conference locked
*
* \retval 0 success
* \rteval non-zero failure
* \retval non-zero failure
*/
static int conf_start_record(struct confbridge_conference *conference)
{
struct ast_app *mixmonapp;
struct ast_channel *chan;
struct ast_format_cap *cap;
struct ast_bridge_features *features;
if (conf_is_recording(conference)) {
return -1;
}
if (conference->record_state != CONF_RECORD_STOP) {
mixmonapp = pbx_findapp("MixMonitor");
if (!mixmonapp) {
ast_log(LOG_WARNING, "Cannot record ConfBridge, MixMonitor app is not installed\n");
return -1;
}
if (!pbx_findapp("MixMonitor")) {
ast_log(LOG_WARNING, "Can not record ConfBridge, MixMonitor app is not installed\n");
features = ast_bridge_features_new();
if (!features) {
return -1;
}
ast_set_flag(&features->feature_flags, AST_BRIDGE_CHANNEL_FLAG_IMMOVABLE);
cap = ast_format_cap_alloc(AST_FORMAT_CAP_FLAG_DEFAULT);
if (!cap) {
ast_bridge_features_destroy(features);
return -1;
}
ast_format_cap_append(cap, ast_format_slin, 0);
conference->record_chan = ast_request("CBRec", cap, NULL, NULL,
conference->name, NULL);
/* Create the recording channel. */
chan = ast_request("CBRec", cap, NULL, NULL, conference->name, NULL);
ao2_ref(cap, -1);
if (!conference->record_chan) {
if (!chan) {
ast_bridge_features_destroy(features);
return -1;
}
conference->record_state = CONF_RECORD_START;
ast_mutex_lock(&conference->record_lock);
ast_cond_signal(&conference->record_cond);
ast_mutex_unlock(&conference->record_lock);
ast_test_suite_event_notify("CONF_START_RECORD", "Message: started conference recording channel\r\nConference: %s", conference->b_profile.name);
send_start_record_event(conference);
return 0;
}
/*! \brief Start the recording thread on a conference bridge
* \internal
* \param conference The conference bridge on which to start the recording thread
* \retval 0 success
* \retval -1 failure
*/
static int start_conf_record_thread(struct confbridge_conference *conference)
{
conf_start_record(conference);
/*
* if the thread has already been started, don't start another
*/
if (conference->record_thread != AST_PTHREADT_NULL) {
return 0;
}
ao2_ref(conference, +1); /* give the record thread a ref */
if (ast_pthread_create_background(&conference->record_thread, NULL, record_thread, conference)) {
ast_log(LOG_WARNING, "Failed to create recording channel for conference %s\n", conference->name);
ao2_ref(conference, -1); /* error so remove ref */
/* Start recording. */
set_rec_filename(conference, &conference->record_filename,
is_new_rec_file(conference->b_profile.rec_file, &conference->orig_rec_file));
ast_answer(chan);
pbx_exec(chan, mixmonapp, ast_str_buffer(conference->record_filename));
/* Put the channel into the conference bridge. */
ast_channel_ref(chan);
conference->record_chan = chan;
if (ast_bridge_impart(conference->bridge, chan, NULL, features,
AST_BRIDGE_IMPART_CHAN_INDEPENDENT)) {
ast_hangup(chan);
ast_channel_unref(chan);
conference->record_chan = NULL;
return -1;
}
ast_test_suite_event_notify("CONF_START_RECORD", "Message: started conference recording channel\r\nConference: %s", conference->b_profile.name);
send_start_record_event(conference);
return 0;
}
@ -964,9 +902,11 @@ static void destroy_conference_bridge(void *obj)
conference->bridge = NULL;
}
ast_channel_cleanup(conference->record_chan);
ast_free(conference->orig_rec_file);
ast_free(conference->record_filename);
conf_bridge_profile_destroy(&conference->b_profile);
ast_cond_destroy(&conference->record_cond);
ast_mutex_destroy(&conference->record_lock);
ast_mutex_destroy(&conference->playback_lock);
}
@ -1209,7 +1149,9 @@ void conf_ended(struct confbridge_conference *conference)
/* Called with a reference to conference */
ao2_unlink(conference_bridges, conference);
send_conf_end_event(conference);
conf_stop_record_thread(conference);
ao2_lock(conference);
conf_stop_record(conference);
ao2_unlock(conference);
}
/*!
@ -1260,12 +1202,15 @@ static struct confbridge_conference *join_conference_bridge(const char *conferen
/* Setup lock for playback channel */
ast_mutex_init(&conference->playback_lock);
/* Setup lock for the record channel */
ast_mutex_init(&conference->record_lock);
ast_cond_init(&conference->record_cond, NULL);
/* Setup for the record channel */
conference->record_filename = ast_str_create(RECORD_FILENAME_INITIAL_SPACE);
if (!conference->record_filename) {
ao2_ref(conference, -1);
ao2_unlock(conference_bridges);
return NULL;
}
/* Setup conference bridge parameters */
conference->record_thread = AST_PTHREADT_NULL;
ast_copy_string(conference->name, conference_name, sizeof(conference->name));
conf_bridge_profile_copy(&conference->b_profile, &user->b_profile);
@ -1303,10 +1248,9 @@ static struct confbridge_conference *join_conference_bridge(const char *conferen
/* Set the initial state to EMPTY */
conference->state = CONF_STATE_EMPTY;
conference->record_state = CONF_RECORD_STOP;
if (ast_test_flag(&conference->b_profile, BRIDGE_OPT_RECORD_CONFERENCE)) {
ao2_lock(conference);
start_conf_record_thread(conference);
conf_start_record(conference);
ao2_unlock(conference);
}
@ -2755,7 +2699,7 @@ static char *handle_cli_confbridge_start_record(struct ast_cli_entry *e, int cmd
ast_copy_string(conference->b_profile.rec_file, rec_file, sizeof(conference->b_profile.rec_file));
}
if (start_conf_record_thread(conference)) {
if (conf_start_record(conference)) {
ast_cli(a->fd, "Could not start recording due to internal error.\n");
ao2_unlock(conference);
ao2_ref(conference, -1);
@ -3089,7 +3033,7 @@ static int action_confbridgestartrecord(struct mansession *s, const struct messa
ast_copy_string(conference->b_profile.rec_file, recordfile, sizeof(conference->b_profile.rec_file));
}
if (start_conf_record_thread(conference)) {
if (conf_start_record(conference)) {
astman_send_error(s, m, "Internal error starting conference recording.");
ao2_unlock(conference);
ao2_ref(conference, -1);

6
apps/confbridge/include/confbridge.h
Unescape View File

@ -218,13 +218,11 @@ struct confbridge_conference {
unsigned int waitingusers; /*!< Number of waiting users present */
unsigned int locked:1; /*!< Is this conference bridge locked? */
unsigned int muted:1; /*!< Is this conference bridge muted? */
unsigned int record_state:2; /*!< Whether recording is started, stopped, or should exit */
struct ast_channel *playback_chan; /*!< Channel used for playback into the conference bridge */
struct ast_channel *record_chan; /*!< Channel used for recording the conference */
pthread_t record_thread; /*!< The thread the recording chan lives in */
struct ast_str *record_filename; /*!< Recording filename. */
struct ast_str *orig_rec_file; /*!< Previous b_profile.rec_file. */
ast_mutex_t playback_lock; /*!< Lock used for playback channel */
ast_mutex_t record_lock; /*!< Lock used for the record thread */
ast_cond_t record_cond; /*!< Recording condition variable */
AST_LIST_HEAD_NOLOCK(, confbridge_user) active_list; /*!< List of users participating in the conference bridge */
AST_LIST_HEAD_NOLOCK(, confbridge_user) waiting_list; /*!< List of users waiting to join the conference bridge */
};

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