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freeswitch_rs/include/switch_limit.c

246 lines
8.1 KiB
C

/*
* FreeSWITCH Modular Media Switching Software Library / Soft-Switch Application
* Copyright (C) 2005-2014, Anthony Minessale II <anthm@freeswitch.org>
*
* Version: MPL 1.1
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* The Original Code is FreeSWITCH Modular Media Switching Software Library / Soft-Switch Application
*
* The Initial Developer of the Original Code is
* Anthony Minessale II <anthm@freeswitch.org>
* Portions created by the Initial Developer are Copyright (C)
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
*
* Rupa Schomaker <rupa@rupa.com>
*
* switch_limit.c Limit support
*
*/
#include <switch.h>
#include <switch_module_interfaces.h> /* this is odd VS 2008 Express requires this- include order problem?? */
static switch_limit_interface_t *get_backend(const char *backend) {
switch_limit_interface_t *limit = NULL;
if (!backend) {
return NULL;
}
if (!(limit = switch_loadable_module_get_limit_interface(backend))) {
switch_log_printf(SWITCH_CHANNEL_LOG, SWITCH_LOG_DEBUG, "Unable to locate limit backend: %s\n", backend);
}
return limit;
}
static void release_backend(switch_limit_interface_t *limit) {
UNPROTECT_INTERFACE(limit);
}
SWITCH_DECLARE(void) switch_limit_init(switch_memory_pool_t *pool) {
if (switch_event_reserve_subclass(LIMIT_EVENT_USAGE) != SWITCH_STATUS_SUCCESS) {
switch_log_printf(SWITCH_CHANNEL_LOG, SWITCH_LOG_ERROR, "Couldn't register event subclass \"%s\"", LIMIT_EVENT_USAGE);
}
}
SWITCH_DECLARE(void) switch_limit_fire_event(const char *backend, const char *realm, const char *key, uint32_t usage, uint32_t rate, uint32_t max, uint32_t ratemax)
{
switch_event_t *event;
if (switch_event_create_subclass(&event, SWITCH_EVENT_CUSTOM, LIMIT_EVENT_USAGE) == SWITCH_STATUS_SUCCESS) {
switch_event_add_header_string(event, SWITCH_STACK_BOTTOM, "backend", backend);
switch_event_add_header_string(event, SWITCH_STACK_BOTTOM, "realm", realm);
switch_event_add_header_string(event, SWITCH_STACK_BOTTOM, "key", key);
switch_event_add_header(event, SWITCH_STACK_BOTTOM, "usage", "%d", usage);
switch_event_add_header(event, SWITCH_STACK_BOTTOM, "rate", "%d", rate);
switch_event_add_header(event, SWITCH_STACK_BOTTOM, "max", "%d", max);
switch_event_add_header(event, SWITCH_STACK_BOTTOM, "ratemax", "%d", ratemax);
switch_event_fire(&event);
}
}
static switch_status_t limit_state_handler(switch_core_session_t *session)
{
switch_channel_t *channel = switch_core_session_get_channel(session);
switch_channel_state_t state = switch_channel_get_state(channel);
const char *vval = switch_channel_get_variable(channel, LIMIT_IGNORE_TRANSFER_VARIABLE);
const char *backendlist = switch_channel_get_variable(channel, LIMIT_BACKEND_VARIABLE);
if (zstr(backendlist)) {
switch_log_printf(SWITCH_CHANNEL_SESSION_LOG(session), SWITCH_LOG_DEBUG, "Unset limit backendlist!\n");
return SWITCH_STATUS_SUCCESS;
}
if (state >= CS_HANGUP || (state == CS_ROUTING && !switch_true(vval))) {
int argc = 0;
char *argv[6] = { 0 };
char *mydata = strdup(backendlist);
int x;
argc = switch_separate_string(mydata, ',', argv, (sizeof(argv) / sizeof(argv[0])));
for (x = 0; x < argc; x++) {
switch_limit_release(argv[x], session, NULL, NULL);
}
switch_core_event_hook_remove_state_change(session, limit_state_handler);
/* Remove limit_backend variable so we register another hook if limit is called again */
switch_channel_set_variable(channel, LIMIT_BACKEND_VARIABLE, NULL);
free(mydata);
}
return SWITCH_STATUS_SUCCESS;
}
SWITCH_DECLARE(switch_status_t) switch_limit_incr(const char *backend, switch_core_session_t *session, const char *realm, const char *resource, const int max, const int interval) {
switch_limit_interface_t *limit = NULL;
switch_channel_t *channel = NULL;
int status = SWITCH_STATUS_SUCCESS;
assert(session);
channel = switch_core_session_get_channel(session);
/* locate impl, call appropriate func */
if (!(limit = get_backend(backend))) {
switch_log_printf(SWITCH_CHANNEL_SESSION_LOG(session), SWITCH_LOG_ERROR, "Limit subsystem %s not found!\n", backend);
switch_goto_status(SWITCH_STATUS_GENERR, end);
}
switch_log_printf(SWITCH_CHANNEL_SESSION_LOG(session), SWITCH_LOG_DEBUG, "incr called: %s_%s max:%d, interval:%d\n",
realm, resource, max, interval);
if ((status = limit->incr(session, realm, resource, max, interval)) == SWITCH_STATUS_SUCCESS) {
/* race condition? what if another leg is doing the same thing? */
const char *existing = switch_channel_get_variable(channel, LIMIT_BACKEND_VARIABLE);
if (existing) {
if (!strstr(existing, backend)) {
switch_channel_set_variable_printf(channel, LIMIT_BACKEND_VARIABLE, "%s,%s", existing, backend);
}
} else {
switch_channel_set_variable(channel, LIMIT_BACKEND_VARIABLE, backend);
switch_core_event_hook_add_state_change(session, limit_state_handler);
}
}
release_backend(limit);
end:
return status;
}
SWITCH_DECLARE(switch_status_t) switch_limit_release(const char *backend, switch_core_session_t *session, const char *realm, const char *resource) {
switch_limit_interface_t *limit = NULL;
int status = SWITCH_STATUS_SUCCESS;
/* locate impl, call appropriate func */
if (!(limit = get_backend(backend))) {
switch_log_printf(SWITCH_CHANNEL_SESSION_LOG(session), SWITCH_LOG_ERROR, "Limit subsystem %s not found!\n", backend);
switch_goto_status(SWITCH_STATUS_GENERR, end);
}
status = limit->release(session, realm, resource);
end:
release_backend(limit);
return status;
}
SWITCH_DECLARE(int) switch_limit_usage(const char *backend, const char *realm, const char *resource, uint32_t *rcount) {
switch_limit_interface_t *limit = NULL;
int usage = 0;
/* locate impl, call appropriate func */
if (!(limit = get_backend(backend))) {
switch_log_printf(SWITCH_CHANNEL_LOG, SWITCH_LOG_ERROR, "Limit subsystem %s not found!\n", backend);
goto end;
}
usage = limit->usage(realm, resource, rcount);
end:
release_backend(limit);
return usage;
}
SWITCH_DECLARE(switch_status_t) switch_limit_reset(const char *backend) {
switch_limit_interface_t *limit = NULL;
int status = SWITCH_STATUS_SUCCESS;
/* locate impl, call appropriate func */
if (!(limit = get_backend(backend))) {
switch_log_printf(SWITCH_CHANNEL_LOG, SWITCH_LOG_ERROR, "Limit subsystem %s not found!\n", backend);
switch_goto_status(SWITCH_STATUS_GENERR, end);
}
status = limit->reset();
end:
release_backend(limit);
return status;
}
SWITCH_DECLARE(switch_status_t) switch_limit_interval_reset(const char *backend, const char *realm, const char *resource) {
switch_limit_interface_t *limit = NULL;
int status = SWITCH_STATUS_SUCCESS;
/* locate impl, call appropriate func */
if (!(limit = get_backend(backend))) {
switch_log_printf(SWITCH_CHANNEL_LOG, SWITCH_LOG_ERROR, "Limit subsystem %s not found!\n", backend);
switch_goto_status(SWITCH_STATUS_GENERR, end);
}
if (!limit->interval_reset) {
switch_log_printf(SWITCH_CHANNEL_LOG, SWITCH_LOG_ERROR, "Limit subsystem %s does not implement interval_reset!\n", backend);
switch_goto_status(SWITCH_STATUS_GENERR, end);
}
status = limit->interval_reset(realm, resource);
end:
release_backend(limit);
return status;
}
SWITCH_DECLARE(char *) switch_limit_status(const char *backend) {
switch_limit_interface_t *limit = NULL;
char *status = NULL;
/* locate impl, call appropriate func */
if (!(limit = get_backend(backend))) {
switch_log_printf(SWITCH_CHANNEL_LOG, SWITCH_LOG_ERROR, "Limit subsystem %s not found!\n", backend);
switch_goto_status(strdup("-ERR"), end);
}
status = limit->status();
end:
release_backend(limit);
return status;
}
/* For Emacs:
* Local Variables:
* mode:c
* indent-tabs-mode:t
* tab-width:4
* c-basic-offset:4
* End:
* For VIM:
* vim:set softtabstop=4 shiftwidth=4 tabstop=4 noet:
*/