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<div id="msg">
<div id="header">FreeSWITCH Subversion</div>
<dl class="meta">
<dt>Revision</dt> <dd><a href="http://fisheye.freeswitch.org/changelog/FreeSWITCH?cs=14665">14665</a></dd>
<dt>Author</dt> <dd>rupa</dd>
<dt>Date</dt> <dd>2009-08-28 11:18:51 -0500 (Fri, 28 Aug 2009)</dd>
</dl>
<h3>Log Message</h3>
<pre>add memcache support (limit_memcache and friends)</pre>
<h3>Modified Paths</h3>
<ul>
<li><a href="#freeswitchtrunksrcmodapplicationsmod_limitmod_limitc">freeswitch/trunk/src/mod/applications/mod_limit/mod_limit.c</a></li>
</ul>
</div>
<div id="patch">
<h3>Diff</h3>
<a id="freeswitchtrunksrcmodapplicationsmod_limitmod_limitc"></a>
<div class="modfile"><h4>Modified: freeswitch/trunk/src/mod/applications/mod_limit/mod_limit.c (14664 => 14665)</h4>
<pre class="diff"><span>
<span class="info">--- freeswitch/trunk/src/mod/applications/mod_limit/mod_limit.c 2009-08-28 14:31:26 UTC (rev 14664)
+++ freeswitch/trunk/src/mod/applications/mod_limit/mod_limit.c 2009-08-28 16:18:51 UTC (rev 14665)
</span><span class="lines">@@ -27,6 +27,7 @@
</span><span class="cx"> * Ken Rice <krice at suspicious dot org
</span><span class="cx"> * Mathieu Rene <mathieu.rene@gmail.com>
</span><span class="cx"> * Bret McDanel <trixter AT 0xdecafbad.com>
</span><ins>+ * Rupa Schomaker <rupa@rupa.com>
</ins><span class="cx"> *
</span><span class="cx"> * mod_limit.c -- Resource Limit Module
</span><span class="cx"> *
</span><span class="lines">@@ -359,6 +360,55 @@
</span><span class="cx"> return SWITCH_STATUS_SUCCESS;
</span><span class="cx"> }
</span><span class="cx">
</span><ins>+static switch_status_t memcache_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);
+ int argc = 0;
+ char *argv[32] = { 0 };
+ char *pvt = switch_channel_get_private(channel, "limit_keys");
+ char *mydata = NULL;
+ int i = 0;
+
+ char *hashkey = NULL;
+ uint32_t total_usage = 0;
+ char *cmd = NULL;
+ switch_stream_handle_t stream = { 0 };
+ SWITCH_STANDARD_STREAM(stream);
+
+ switch_assert(pvt);
+
+ /* The call is either hung up, or is going back into the dialplan, decrement appropriate couters */
+ if (state >= CS_HANGUP || state == CS_ROUTING) {
+
+ /* Loop through the channel's keys which contains mapping to all the limits referenced by that channel */
+ mydata = switch_core_session_strdup(session, pvt);
+ argc = switch_separate_string(mydata, ',', argv, (sizeof(argv) / sizeof(argv[0])));
+ for (i = 0; i < argc; i++) {
+ hashkey = argv[i];
+ cmd = switch_core_session_sprintf(session, "decrement limit:%s_total 1", hashkey);
+ switch_api_execute("memcache", cmd, session, &stream);
+ if (strncmp("-ERR", stream.data, 4)) {
+ total_usage = atoi(stream.data);
+ switch_log_printf(SWITCH_CHANNEL_SESSION_LOG(session), SWITCH_LOG_INFO, "Usage for %s is now %d\n", (const char*)hashkey, total_usage);
+ } else {
+ switch_log_printf(SWITCH_CHANNEL_SESSION_LOG(session), SWITCH_LOG_ERROR, "Error from mod_memcache %s.", (const char *) stream.data);
+ goto end;
+ }
+
+ stream.end = stream.data;
+ }
+
+ /* Remove handler */
+ switch_core_event_hook_remove_state_change(session, memcache_state_handler);
+ switch_channel_set_private(channel, "limit_keys", NULL);
+ }
+
+end:
+ switch_safe_free(stream.data);
+ return SWITCH_STATUS_SUCCESS;
+}
+
</ins><span class="cx"> struct callback {
</span><span class="cx"> char *buf;
</span><span class="cx"> size_t len;
</span><span class="lines">@@ -1152,6 +1202,350 @@
</span><span class="cx"> return SWITCH_STATUS_SUCCESS;
</span><span class="cx"> }
</span><span class="cx">
</span><ins>+/* \brief Enforces limit_memcache restrictions
+ * \param session current session
+ * \param realm limit realm
+ * \param id limit id
+ * \param max maximum count
+ * \param interval interval for rate limiting
+ * \return SWITCH_TRUE if the access is allowed, SWITCH_FALSE if it isnt
+ */
+static switch_bool_t do_limit_memcache(switch_core_session_t *session, const char *realm, const char *id, int max, int interval)
+{
+ switch_channel_t *channel = switch_core_session_get_channel(session);
+ char *hashkey = NULL;
+ switch_bool_t status = SWITCH_TRUE;
+ uint8_t increment = 1;
+ uint32_t total_usage = 0;
+ uint32_t rate_usage = 0;
+ char *cmd = NULL;
+ char *pvt = NULL;
+ int argc = 0;
+ int i = 0;
+ char *argv[32] = { 0 };
+ char *mydata = NULL;
+
+ switch_stream_handle_t stream = { 0 };
+
+ if (switch_loadable_module_exists("mod_memcache") != SWITCH_STATUS_SUCCESS) {
+ status = SWITCH_TRUE;
+ switch_log_printf(SWITCH_CHANNEL_SESSION_LOG(session), SWITCH_LOG_ERROR, "mod_memcache is not loaded.");
+ goto end;
+ }
+
+ SWITCH_STANDARD_STREAM(stream);
+ hashkey = switch_core_session_sprintf(session, "%s_%s", realm, id);
+
+ /* Did we already run on this channel before? */
+ if ((pvt = switch_channel_get_private(channel, "limit_keys")))
+ {
+ /* Yes, but check if we did that realm+id
+ If we didnt, allow incrementing the counter.
+ If we did, dont touch it but do the validation anyways
+ */
+ mydata = switch_core_session_strdup(session, pvt);
+ argc = switch_separate_string(mydata, ',', argv, (sizeof(argv) / sizeof(argv[0])));
+ for (i = 0; i < argc; i++) {
+ if (!strcmp(hashkey, argv[i])) {
+ increment = 0;
+ break;
+ }
+ }
+ }
+
+ cmd = switch_core_session_sprintf(session, "get limit:%s_total", hashkey);
+ switch_api_execute("memcache", cmd, session, &stream);
+ if (strncmp("-ERR", stream.data, 4)) {
+ total_usage = atoi(stream.data);
+ } else if (!strncmp("-ERR NOT FOUND", stream.data, 14)) {
+ total_usage = 0;
+ } else {
+ switch_log_printf(SWITCH_CHANNEL_SESSION_LOG(session), SWITCH_LOG_ERROR, "Error from mod_memcache %s.", (const char *) stream.data);
+ status = SWITCH_TRUE;
+ goto end;
+ }
+
+ stream.end = stream.data;
+
+ if (interval > 0) {
+ cmd = switch_core_session_sprintf(session, "increment limit:%s_rate 1 %d", hashkey, interval);
+ switch_api_execute("memcache", cmd, session, &stream);
+ if (strncmp("-ERR", stream.data, 4)) {
+ rate_usage = atoi(stream.data);
+ } else {
+ switch_log_printf(SWITCH_CHANNEL_SESSION_LOG(session), SWITCH_LOG_ERROR, "Error from mod_memcache %s.", (const char *) stream.data);
+ status = SWITCH_TRUE;
+ goto end;
+ }
+ if ((max >= 0) && (rate_usage > (uint32_t)max)) {
+ switch_log_printf(SWITCH_CHANNEL_SESSION_LOG(session), SWITCH_LOG_INFO, "Usage for %s exceeds maximum rate of %d/%ds, now at %d\n", hashkey, max, interval, rate_usage);
+ status = SWITCH_FALSE;
+ goto end;
+ }
+ } else if ((max >= 0) && (total_usage + increment > (uint32_t)max)) {
+ switch_log_printf(SWITCH_CHANNEL_SESSION_LOG(session), SWITCH_LOG_INFO, "Usage for %s is already at max value (%d)\n", hashkey, total_usage);
+ status = SWITCH_FALSE;
+ goto end;
+ }
+
+ stream.end = stream.data;
+
+ if (increment) {
+ cmd = switch_core_session_sprintf(session, "increment limit:%s_total 1", hashkey);
+ switch_api_execute("memcache", cmd, session, &stream);
+ if (strncmp("-ERR", stream.data, 4)) {
+ total_usage = atoi(stream.data);
+ } else {
+ switch_log_printf(SWITCH_CHANNEL_SESSION_LOG(session), SWITCH_LOG_ERROR, "Error from mod_memcache %s.", (const char *) stream.data);
+ status = SWITCH_TRUE;
+ goto end;
+ }
+ if (max == -1) {
+ switch_log_printf(SWITCH_CHANNEL_SESSION_LOG(session), SWITCH_LOG_INFO, "Usage for %s is now %d\n", hashkey, total_usage);
+ } else if (interval == 0) {
+ switch_log_printf(SWITCH_CHANNEL_SESSION_LOG(session), SWITCH_LOG_INFO, "Usage for %s is now %d/%d\n", hashkey, total_usage, max);
+ } else {
+ switch_log_printf(SWITCH_CHANNEL_SESSION_LOG(session), SWITCH_LOG_INFO, "Usage for %s is now %d/%d for the last %d seconds\n", hashkey, rate_usage, max, interval);
+ }
+
+ limit_fire_event(realm, id, total_usage, rate_usage, max, max >=0 ? (uint32_t)max : 0);
+ }
+
+ /* Save current usage & rate into channel variables so it can be used later in the dialplan, or added to CDR records */
+ {
+ const char *susage = switch_core_session_sprintf(session, "%d", total_usage);
+ const char *srate = switch_core_session_sprintf(session, "%d", rate_usage);
+
+ switch_channel_set_variable(channel, "limit_usage", susage);
+ switch_channel_set_variable(channel, switch_core_session_sprintf(session, "limit_usage_%s", hashkey), susage);
+
+ switch_channel_set_variable(channel, "limit_rate", srate);
+ switch_channel_set_variable(channel, switch_core_session_sprintf(session, "limit_rate_%s", hashkey), srate);
+ }
+
+ if (pvt && increment) {
+ pvt = switch_core_session_sprintf(session, "%s,%s", pvt, hashkey);
+ } else {
+ /* This is the first limit check on this channel, create a hashtable, set our prviate data and add a state handler */
+ pvt = (char *) hashkey;
+ }
+ switch_log_printf(SWITCH_CHANNEL_SESSION_LOG(session), SWITCH_LOG_DEBUG, "hash_keys: %s\n", pvt);
+ switch_channel_set_private(channel, "limit_keys", pvt);
+
+ switch_core_event_hook_add_state_change(session, memcache_state_handler);
+
+end:
+ switch_safe_free(stream.data);
+ return status;
+}
+
+/* !\brief Releases usage of a limit_hash-controlled ressource */
+static void limit_memcache_release(switch_core_session_t *session, const char *realm, const char *id)
+{
+ char *hashkey = NULL;
+ uint32_t total_usage = 0;
+ char *cmd = NULL;
+ switch_stream_handle_t stream = { 0 };
+ SWITCH_STANDARD_STREAM(stream);
+
+ if (switch_loadable_module_exists("mod_memcache") != SWITCH_STATUS_SUCCESS) {
+ switch_log_printf(SWITCH_CHANNEL_SESSION_LOG(session), SWITCH_LOG_ERROR, "mod_memcache is not loaded.");
+ goto end;
+ }
+
+ hashkey = switch_core_session_sprintf(session, "%s_%s", realm, id);
+
+ cmd = switch_core_session_sprintf(session, "decrement limit:%s_total 1", hashkey);
+ switch_api_execute("memcache", cmd, session, &stream);
+ if (strncmp("-ERR", stream.data, 4)) {
+ total_usage = atoi(stream.data);
+ } else if (!strncmp("-ERR NOT FOUND", stream.data, 14)) {
+ total_usage = 0;
+ } else {
+ switch_log_printf(SWITCH_CHANNEL_SESSION_LOG(session), SWITCH_LOG_ERROR, "Error from mod_memcache %s.", (const char *) stream.data);
+ goto end;
+ }
+
+ switch_log_printf(SWITCH_CHANNEL_SESSION_LOG(session), SWITCH_LOG_INFO, "Usage for %s is now %d\n", (const char*)hashkey, total_usage);
+
+end:
+ switch_safe_free(stream.data);
+}
+
+#define LIMITMEMCACHE_USAGE "<realm> <id> [<max>[/interval]] [number [dialplan [context]]]"
+#define LIMITMEMCACHE_DESC "limit access to a resource and transfer to an extension if the limit is exceeded"
+SWITCH_STANDARD_APP(limit_memcache_function)
+{
+ int argc = 0;
+ char *argv[6] = { 0 };
+ char *mydata = NULL;
+ char *realm = NULL;
+ char *id = NULL;
+ char *xfer_exten = NULL;
+ int max = -1;
+ int interval = 0;
+ char *szinterval = NULL;
+ switch_channel_t *channel = switch_core_session_get_channel(session);
+
+ /* Parse application data */
+ if (!switch_strlen_zero(data)) {
+ mydata = switch_core_session_strdup(session, data);
+ argc = switch_separate_string(mydata, ' ', argv, (sizeof(argv) / sizeof(argv[0])));
+ }
+
+ if (argc < 2) {
+ switch_log_printf(SWITCH_CHANNEL_SESSION_LOG(session), SWITCH_LOG_WARNING, "USAGE: limit_memcache %s\n", LIMITMEMCACHE_USAGE);
+ return;
+ }
+
+ realm = argv[0];
+ id = argv[1];
+
+ /* If max is omitted, only act as a counter and skip maximum checks */
+ if (argc > 2) {
+ if ((szinterval = strchr(argv[2], '/')))
+ {
+ *szinterval++ = '\0';
+ interval = atoi(szinterval);
+ }
+
+ max = atoi(argv[2]);
+
+ if (max < 0) {
+ max = 0;
+ }
+ }
+
+ if (argc > 3) {
+ xfer_exten = argv[3];
+ } else {
+ xfer_exten = limit_def_xfer_exten;
+ }
+
+ if (!do_limit_memcache(session, realm, id, max, interval)) {
+ /* Limit exceeded */
+ if (*xfer_exten == '!') {
+ switch_channel_hangup(channel, switch_channel_str2cause(xfer_exten+1));
+ } else {
+ switch_ivr_session_transfer(session, xfer_exten, argv[4], argv[5]);
+ }
+ }
+}
+
+
+#define LIMITMEMCACHEEXECUTE_USAGE "<realm> <id> [<max>[/interval]] [application] [application arguments]"
+#define LIMITMEMCACHEEXECUTE_DESC "limit access to a resource. the specified application will only be executed if the resource is available"
+SWITCH_STANDARD_APP(limit_memcache_execute_function)
+{
+ int argc = 0;
+ char *argv[5] = { 0 };
+ char *mydata = NULL;
+ char *realm = NULL;
+ char *id = NULL;
+ char *app = NULL;
+ char *app_arg = NULL;
+ int max = -1;
+ int interval = 0;
+ char *szinterval = NULL;
+
+ /* Parse application data */
+ if (!switch_strlen_zero(data)) {
+ mydata = switch_core_session_strdup(session, data);
+ argc = switch_separate_string(mydata, ' ', argv, (sizeof(argv) / sizeof(argv[0])));
+ }
+
+ if (argc < 2) {
+ switch_log_printf(SWITCH_CHANNEL_SESSION_LOG(session), SWITCH_LOG_WARNING, "USAGE: limit_memcache_execute %s\n", LIMITMEMCACHEEXECUTE_USAGE);
+ return;
+ }
+
+ realm = argv[0];
+ id = argv[1];
+
+ /* If max is omitted, only act as a counter and skip maximum checks */
+ if (argc > 2) {
+ if ((szinterval = strchr(argv[2], '/')))
+ {
+ *szinterval++ = '\0';
+ interval = atoi(szinterval);
+ }
+
+ max = atoi(argv[2]);
+
+ if (max < 0) {
+ max = 0;
+ }
+ }
+
+
+ app = argv[3];
+ app_arg = argv[4];
+
+ if (switch_strlen_zero(app)) {
+ switch_log_printf(SWITCH_CHANNEL_SESSION_LOG(session), SWITCH_LOG_ERROR, "Missing application\n");
+ return;
+ }
+
+ if (do_limit_memcache(session, realm, id, max, interval)) {
+ switch_core_session_execute_application(session, app, app_arg);
+ limit_memcache_release(session, realm, id);
+ }
+}
+
+
+#define LIMIT_MEMCACHE_USAGE_USAGE "<realm> <id>"
+SWITCH_STANDARD_API(limit_memcache_usage_function)
+{
+ int argc = 0;
+ char *argv[3] = { 0 };
+ char *mydata = NULL;
+ uint32_t count = 0;
+ char *apicmd = NULL;
+ switch_bool_t status = SWITCH_TRUE;
+ switch_stream_handle_t apistream = { 0 };
+
+ SWITCH_STANDARD_STREAM(apistream);
+ if (switch_loadable_module_exists("mod_memcache") != SWITCH_STATUS_SUCCESS) {
+ status = SWITCH_TRUE;
+ switch_log_printf(SWITCH_CHANNEL_SESSION_LOG(session), SWITCH_LOG_ERROR, "mod_memcache is not loaded.");
+ stream->write_function(stream, "-ERR mod_memcache not loaded");
+ goto end;
+ }
+
+ if (!switch_strlen_zero(cmd)) {
+ mydata = strdup(cmd);
+ switch_assert(mydata);
+ argc = switch_separate_string(mydata, ' ', argv, (sizeof(argv) / sizeof(argv[0])));
+ }
+
+ if (argc < 2) {
+ stream->write_function(stream, "USAGE: limit_memcache_usage %s\n", LIMIT_MEMCACHE_USAGE_USAGE);
+ goto end;
+ }
+
+ apicmd = switch_mprintf("get limit:%s_%s_total", argv[0], argv[1]);
+ switch_api_execute("memcache", apicmd, session, &apistream);
+ if (strncmp("-ERR", apistream.data, 4)) {
+ count = atoi(apistream.data);
+ } else if (!strncmp("-ERR NOT FOUND", apistream.data, 14)) {
+ count = 0;
+ } else {
+ switch_log_printf(SWITCH_CHANNEL_SESSION_LOG(session), SWITCH_LOG_ERROR, "Error from mod_memcache %s.", (const char *) apistream.data);
+ status = SWITCH_TRUE;
+ goto end;
+ }
+
+ stream->write_function(stream, "%d", count);
+
+end:
+ switch_safe_free(mydata);
+ switch_safe_free(apistream.data);
+ switch_safe_free(apicmd);
+
+ return SWITCH_STATUS_SUCCESS;
+}
+
+
</ins><span class="cx"> SWITCH_MODULE_LOAD_FUNCTION(mod_limit_load)
</span><span class="cx"> {
</span><span class="cx"> switch_status_t status;
</span><span class="lines">@@ -1187,11 +1581,14 @@
</span><span class="cx"> SWITCH_ADD_APP(app_interface, "limit", "Limit", LIMIT_DESC, limit_function, LIMIT_USAGE, SAF_SUPPORT_NOMEDIA);
</span><span class="cx"> SWITCH_ADD_APP(app_interface, "limit_hash", "Limit (hash)", LIMITHASH_DESC, limit_hash_function, LIMITHASH_USAGE, SAF_SUPPORT_NOMEDIA);
</span><span class="cx"> SWITCH_ADD_APP(app_interface, "limit_hash_execute", "Limit (hash)", LIMITHASHEXECUTE_USAGE, limit_hash_execute_function, LIMITHASHEXECUTE_USAGE, SAF_SUPPORT_NOMEDIA);
</span><ins>+ SWITCH_ADD_APP(app_interface, "limit_memcache", "Limit (memcache)", LIMITMEMCACHE_DESC, limit_memcache_function, LIMITMEMCACHE_USAGE, SAF_SUPPORT_NOMEDIA);
+ SWITCH_ADD_APP(app_interface, "limit_memcache_execute", "Limit (memcache)", LIMITMEMCACHEEXECUTE_USAGE, limit_memcache_execute_function, LIMITMEMCACHEEXECUTE_USAGE, SAF_SUPPORT_NOMEDIA);
</ins><span class="cx"> SWITCH_ADD_APP(app_interface, "db", "Insert to the db", DB_DESC, db_function, DB_USAGE, SAF_SUPPORT_NOMEDIA);
</span><span class="cx"> SWITCH_ADD_APP(app_interface, "hash", "Insert into the hashtable", HASH_DESC, hash_function, HASH_USAGE, SAF_SUPPORT_NOMEDIA)
</span><span class="cx"> SWITCH_ADD_APP(app_interface, "group", "Manage a group", GROUP_DESC, group_function, GROUP_USAGE, SAF_SUPPORT_NOMEDIA);
</span><span class="cx">
</span><span class="cx"> SWITCH_ADD_API(commands_api_interface, "limit_hash_usage", "Gets the usage count of a limited resource", limit_hash_usage_function, LIMIT_HASH_USAGE_USAGE);
</span><ins>+ SWITCH_ADD_API(commands_api_interface, "limit_memcache_usage", "Gets the usage count of a limited resource", limit_memcache_usage_function, LIMIT_MEMCACHE_USAGE_USAGE);
</ins><span class="cx"> SWITCH_ADD_API(commands_api_interface, "limit_usage", "Gets the usage count of a limited resource", limit_usage_function, "<realm> <id>");
</span><span class="cx"> SWITCH_ADD_API(commands_api_interface, "db", "db get/set", db_api_function, "[insert|delete|select]/<realm>/<key>/<value>");
</span><span class="cx"> switch_console_set_complete("add db insert");
</span></span></pre>
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