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Manager: Short circuit AMI message processing.

Browse Source 
Improve AMI message processing performance if there are no consumers
listening for the messages.  We now skip creating the AMI event message
text strings.

Change-Id: I7b22fc5ec4e500d00635c1a467aa8ea68a1bb2b3
changes/93/2593/2
Richard Mudgett 9 years ago
parent 6ddd856b86
commit 06632a0d11
3 changed files with 152 additions and 37 deletions
Show Stats Download Patch File Download Diff File

24
include/asterisk/stasis.h
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@ -414,14 +414,14 @@ const struct timeval *stasis_message_timestamp(const struct stasis_message *msg)
* May return \c NULL, to indicate no representation. The returned object should
* be ast_json_unref()'ed.
*
* \param message Message to convert to JSON string.
* \param msg Message to convert to JSON string.
* \param sanitize Snapshot sanitization callback.
*
* \return Newly allocated string with JSON message.
* \return \c NULL on error.
* \return \c NULL if JSON format is not supported.
*/
struct ast_json *stasis_message_to_json(struct stasis_message *message, struct stasis_message_sanitizer *sanitize);
struct ast_json *stasis_message_to_json(struct stasis_message *msg, struct stasis_message_sanitizer *sanitize);
/*!
* \brief Build the AMI representation of the message.
@ -429,12 +429,21 @@ struct ast_json *stasis_message_to_json(struct stasis_message *message, struct s
* May return \c NULL, to indicate no representation. The returned object should
* be ao2_cleanup()'ed.
*
* \param message Message to convert to AMI.
* \param msg Message to convert to AMI.
* \return \c NULL on error.
* \return \c NULL if AMI format is not supported.
*/
struct ast_manager_event_blob *stasis_message_to_ami(
struct stasis_message *message);
struct ast_manager_event_blob *stasis_message_to_ami(struct stasis_message *msg);
/*!
* \brief Determine if the given message can be converted to AMI.
*
* \param msg Message to see if can be converted to AMI.
*
* \retval 0 Cannot be converted
* \retval non-zero Can be converted
*/
int stasis_message_can_be_ami(struct stasis_message *msg);
/*!
* \brief Build the \ref AstGenericEvents representation of the message.
@ -442,12 +451,11 @@ struct ast_manager_event_blob *stasis_message_to_ami(
* May return \c NULL, to indicate no representation. The returned object should
* be disposed of via \ref ast_event_destroy.
*
* \param message Message to convert to AMI.
* \param msg Message to convert to AMI.
* \return \c NULL on error.
* \return \c NULL if AMI format is not supported.
*/
struct ast_event *stasis_message_to_event(
struct stasis_message *message);
struct ast_event *stasis_message_to_event(struct stasis_message *msg);
/*!
* \brief A topic to which messages may be posted, and subscribers, well, subscribe

130
main/manager.c
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@ -1549,6 +1549,17 @@ static AST_RWLIST_HEAD_STATIC(manager_hooks, manager_custom_hook);
/*! \brief A container of event documentation nodes */
static AO2_GLOBAL_OBJ_STATIC(event_docs);
static int __attribute__((format(printf, 9, 0))) __manager_event_sessions(
struct ao2_container *sessions,
int category,
const char *event,
int chancount,
struct ast_channel **chans,
const char *file,
int line,
const char *func,
const char *fmt,
...);
static enum add_filter_result manager_add_filter(const char *filter_pattern, struct ao2_container *whitefilters, struct ao2_container *blackfilters);
static int match_filter(struct mansession *s, char *eventdata);
@ -1687,38 +1698,75 @@ struct ast_str *ast_manager_str_from_json_object(struct ast_json *blob, key_excl
return res;
}
#define manager_event_sessions(sessions, category, event, contents , ...) \
__manager_event_sessions(sessions, category, event, 0, NULL, __FILE__, __LINE__, __PRETTY_FUNCTION__, contents , ## __VA_ARGS__)
#define any_manager_listeners(sessions) \
((sessions && ao2_container_count(sessions)) || !AST_RWLIST_EMPTY(&manager_hooks))
static void manager_default_msg_cb(void *data, struct stasis_subscription *sub,
struct stasis_message *message)
{
struct ao2_container *sessions;
struct ast_manager_event_blob *ev;
if (!stasis_message_can_be_ami(message)) {
/* Not an AMI message; disregard */
return;
}
sessions = ao2_global_obj_ref(mgr_sessions);
if (!any_manager_listeners(sessions)) {
/* Nobody is listening */
ao2_cleanup(sessions);
return;
}
ev = stasis_message_to_ami(message);
if (!ev) {
/* Not an AMI message; disregard */
/* Conversion failure */
ao2_cleanup(sessions);
return;
}
manager_event(ev->event_flags, ev->manager_event, "%s",
ev->extra_fields);
manager_event_sessions(sessions, ev->event_flags, ev->manager_event,
"%s", ev->extra_fields);
ao2_ref(ev, -1);
ao2_cleanup(sessions);
}
static void manager_generic_msg_cb(void *data, struct stasis_subscription *sub,
struct stasis_message *message)
{
struct ast_json_payload *payload = stasis_message_data(message);
int class_type = ast_json_integer_get(ast_json_object_get(payload->json, "class_type"));
const char *type = ast_json_string_get(ast_json_object_get(payload->json, "type"));
struct ast_json *event = ast_json_object_get(payload->json, "event");
struct ast_json_payload *payload;
int class_type;
const char *type;
struct ast_json *event;
struct ast_str *event_buffer;
struct ao2_container *sessions;
sessions = ao2_global_obj_ref(mgr_sessions);
if (!any_manager_listeners(sessions)) {
/* Nobody is listening */
ao2_cleanup(sessions);
return;
}
payload = stasis_message_data(message);
class_type = ast_json_integer_get(ast_json_object_get(payload->json, "class_type"));
type = ast_json_string_get(ast_json_object_get(payload->json, "type"));
event = ast_json_object_get(payload->json, "event");
event_buffer = ast_manager_str_from_json_object(event, NULL);
if (!event_buffer) {
ast_log(AST_LOG_WARNING, "Error while creating payload for event %s\n", type);
ao2_cleanup(sessions);
return;
}
manager_event(class_type, type, "%s", ast_str_buffer(event_buffer));
manager_event_sessions(sessions, class_type, type,
"%s", ast_str_buffer(event_buffer));
ast_free(event_buffer);
ao2_cleanup(sessions);
}
void ast_manager_publish_event(const char *type, int class_type, struct ast_json *obj)
@ -6645,22 +6693,24 @@ static void append_channel_vars(struct ast_str **pbuf, struct ast_channel *chan)
AST_THREADSTORAGE(manager_event_buf);
#define MANAGER_EVENT_BUF_INITSIZE 256
int __ast_manager_event_multichan(int category, const char *event, int chancount,
struct ast_channel **chans, const char *file, int line, const char *func,
const char *fmt, ...)
static int __attribute__((format(printf, 9, 0))) __manager_event_sessions_va(
struct ao2_container *sessions,
int category,
const char *event,
int chancount,
struct ast_channel **chans,
const char *file,
int line,
const char *func,
const char *fmt,
va_list ap)
{
RAII_VAR(struct ao2_container *, sessions, ao2_global_obj_ref(mgr_sessions), ao2_cleanup);
struct ast_str *auth = ast_str_alloca(MAX_AUTH_PERM_STRING);
const char *cat_str;
va_list ap;
struct timeval now;
struct ast_str *buf;
int i;
if (!(sessions && ao2_container_count(sessions)) && AST_RWLIST_EMPTY(&manager_hooks)) {
return 0;
}
buf = ast_str_thread_get(&manager_event_buf, MANAGER_EVENT_BUF_INITSIZE);
if (!buf) {
return -1;
@ -6696,9 +6746,7 @@ int __ast_manager_event_multichan(int category, const char *event, int chancount
ast_config_AST_SYSTEM_NAME);
}
va_start(ap, fmt);
ast_str_append_va(&buf, 0, fmt, ap);
va_end(ap);
for (i = 0; i < chancount; i++) {
append_channel_vars(&buf, chans[i]);
}
@ -6744,6 +6792,50 @@ int __ast_manager_event_multichan(int category, const char *event, int chancount
return 0;
}
static int __attribute__((format(printf, 9, 0))) __manager_event_sessions(
struct ao2_container *sessions,
int category,
const char *event,
int chancount,
struct ast_channel **chans,
const char *file,
int line,
const char *func,
const char *fmt,
...)
{
va_list ap;
int res;
va_start(ap, fmt);
res = __manager_event_sessions_va(sessions, category, event, chancount, chans,
file, line, func, fmt, ap);
va_end(ap);
return res;
}
int __ast_manager_event_multichan(int category, const char *event, int chancount,
struct ast_channel **chans, const char *file, int line, const char *func,
const char *fmt, ...)
{
struct ao2_container *sessions = ao2_global_obj_ref(mgr_sessions);
va_list ap;
int res;
if (!any_manager_listeners(sessions)) {
/* Nobody is listening */
ao2_cleanup(sessions);
return 0;
}
va_start(ap, fmt);
res = __manager_event_sessions_va(sessions, category, event, chancount, chans,
file, line, func, fmt, ap);
va_end(ap);
ao2_cleanup(sessions);
return res;
}
/*! \brief
* support functions to register/unregister AMI action handlers,
*/

35
main/stasis_message.c
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@ -170,17 +170,17 @@ const struct timeval *stasis_message_timestamp(const struct stasis_message *msg)
return &msg->timestamp;
}
#define INVOKE_VIRTUAL(fn, ...) \
({ \
if (msg == NULL) { \
return NULL; \
} \
ast_assert(msg->type != NULL); \
#define INVOKE_VIRTUAL(fn, ...) \
({ \
if (!msg) { \
return NULL; \
} \
ast_assert(msg->type != NULL); \
ast_assert(msg->type->vtable != NULL); \
if (msg->type->vtable->fn == NULL) { \
return NULL; \
} \
msg->type->vtable->fn(__VA_ARGS__); \
if (!msg->type->vtable->fn) { \
return NULL; \
} \
msg->type->vtable->fn(__VA_ARGS__); \
})
struct ast_manager_event_blob *stasis_message_to_ami(struct stasis_message *msg)
@ -199,3 +199,18 @@ struct ast_event *stasis_message_to_event(struct stasis_message *msg)
{
return INVOKE_VIRTUAL(to_event, msg);
}
#define HAS_VIRTUAL(fn, msg) \
({ \
if (!msg) { \
return 0; \
} \
ast_assert(msg->type != NULL); \
ast_assert(msg->type->vtable != NULL); \
!!msg->type->vtable->fn; \
})
int stasis_message_can_be_ami(struct stasis_message *msg)
{
return HAS_VIRTUAL(to_ami, msg);
}

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