eec010829a
Change-Id: Icf88f9f861c6b2a16e5f626ff25795218a6f2723
297 lines
8.3 KiB
C
297 lines
8.3 KiB
C
/*
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* Asterisk -- An open source telephony toolkit.
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*
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* Copyright (C) 2013, Digium, Inc.
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*
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* Joshua Colp <jcolp@digium.com>
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*
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* See http://www.asterisk.org for more information about
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* the Asterisk project. Please do not directly contact
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* any of the maintainers of this project for assistance;
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* the project provides a web site, mailing lists and IRC
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* channels for your use.
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*
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* This program is free software, distributed under the terms of
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* the GNU General Public License Version 2. See the LICENSE file
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* at the top of the source tree.
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*/
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/*** MODULEINFO
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<depend>pjproject</depend>
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<depend>res_pjsip</depend>
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<support_level>core</support_level>
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***/
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#include "asterisk.h"
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#include <pjsip.h>
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#include "asterisk/res_pjsip.h"
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#include "asterisk/module.h"
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#include "asterisk/sched.h"
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#define CONTACT_AUTOEXPIRE_BUCKETS 977
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static struct ao2_container *contact_autoexpire;
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/*! \brief Scheduler used for automatically expiring contacts */
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static struct ast_sched_context *sched;
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/*! \brief Structure used for contact auto-expiration */
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struct contact_expiration {
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/*! \brief Contact that is being auto-expired */
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struct ast_sip_contact *contact;
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/*! \brief Scheduled item for performing expiration */
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int sched;
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};
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/*! \brief Destructor function for contact auto-expiration */
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static void contact_expiration_destroy(void *obj)
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{
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struct contact_expiration *expiration = obj;
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ao2_cleanup(expiration->contact);
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}
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/*! \brief Hashing function for contact auto-expiration */
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static int contact_expiration_hash(const void *obj, const int flags)
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{
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const struct contact_expiration *object;
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const char *key;
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switch (flags & OBJ_SEARCH_MASK) {
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case OBJ_SEARCH_KEY:
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key = obj;
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break;
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case OBJ_SEARCH_OBJECT:
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object = obj;
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key = ast_sorcery_object_get_id(object->contact);
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break;
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default:
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/* Hash can only work on something with a full key. */
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ast_assert(0);
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return 0;
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}
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return ast_str_hash(key);
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}
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/*! \brief Comparison function for contact auto-expiration */
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static int contact_expiration_cmp(void *obj, void *arg, int flags)
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{
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const struct contact_expiration *object_left = obj;
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const struct contact_expiration *object_right = arg;
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const char *right_key = arg;
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int cmp;
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switch (flags & OBJ_SEARCH_MASK) {
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case OBJ_SEARCH_OBJECT:
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right_key = ast_sorcery_object_get_id(object_right->contact);
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/* Fall through */
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case OBJ_SEARCH_KEY:
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cmp = strcmp(ast_sorcery_object_get_id(object_left->contact), right_key);
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break;
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case OBJ_SEARCH_PARTIAL_KEY:
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/*
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* We could also use a partial key struct containing a length
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* so strlen() does not get called for every comparison instead.
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*/
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cmp = strncmp(ast_sorcery_object_get_id(object_left->contact), right_key,
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strlen(right_key));
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break;
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default:
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/*
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* What arg points to is specific to this traversal callback
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* and has no special meaning to astobj2.
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*/
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cmp = 0;
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break;
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}
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if (cmp) {
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return 0;
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}
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/*
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* At this point the traversal callback is identical to a sorted
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* container.
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*/
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return CMP_MATCH;
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}
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/*! \brief Scheduler function which deletes a contact */
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static int contact_expiration_expire(const void *data)
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{
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struct contact_expiration *expiration = (void *) data;
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expiration->sched = -1;
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/* This will end up invoking the deleted observer callback, which will perform the unlinking and such */
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ast_sorcery_delete(ast_sip_get_sorcery(), expiration->contact);
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ao2_ref(expiration, -1);
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return 0;
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}
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/*! \brief Observer callback for when a contact is created */
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static void contact_expiration_observer_created(const void *object)
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{
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const struct ast_sip_contact *contact = object;
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struct contact_expiration *expiration;
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int expires = MAX(0, ast_tvdiff_ms(contact->expiration_time, ast_tvnow()));
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if (ast_tvzero(contact->expiration_time)) {
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return;
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}
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expiration = ao2_alloc_options(sizeof(*expiration), contact_expiration_destroy,
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AO2_ALLOC_OPT_LOCK_NOLOCK);
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if (!expiration) {
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return;
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}
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expiration->contact = (struct ast_sip_contact*)contact;
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ao2_ref(expiration->contact, +1);
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ao2_ref(expiration, +1);
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if ((expiration->sched = ast_sched_add(sched, expires, contact_expiration_expire, expiration)) < 0) {
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ao2_ref(expiration, -1);
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ast_log(LOG_ERROR, "Scheduled expiration for contact '%s' could not be performed, contact may persist past life\n",
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ast_sorcery_object_get_id(contact));
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} else {
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ao2_link(contact_autoexpire, expiration);
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}
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ao2_ref(expiration, -1);
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}
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/*! \brief Observer callback for when a contact is updated */
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static void contact_expiration_observer_updated(const void *object)
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{
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const struct ast_sip_contact *contact = object;
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struct contact_expiration *expiration;
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int expires = MAX(0, ast_tvdiff_ms(contact->expiration_time, ast_tvnow()));
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expiration = ao2_find(contact_autoexpire, ast_sorcery_object_get_id(contact),
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OBJ_SEARCH_KEY);
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if (!expiration) {
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return;
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}
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AST_SCHED_REPLACE_UNREF(expiration->sched, sched, expires, contact_expiration_expire,
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expiration, ao2_cleanup(expiration), ao2_cleanup(expiration), ao2_ref(expiration, +1));
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ao2_ref(expiration, -1);
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}
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/*! \brief Observer callback for when a contact is deleted */
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static void contact_expiration_observer_deleted(const void *object)
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{
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struct contact_expiration *expiration;
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expiration = ao2_find(contact_autoexpire, ast_sorcery_object_get_id(object),
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OBJ_SEARCH_KEY | OBJ_UNLINK);
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if (!expiration) {
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return;
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}
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AST_SCHED_DEL_UNREF(sched, expiration->sched, ao2_cleanup(expiration));
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ao2_ref(expiration, -1);
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}
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/*! \brief Observer callbacks for autoexpiring contacts */
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static const struct ast_sorcery_observer contact_expiration_observer = {
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.created = contact_expiration_observer_created,
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.updated = contact_expiration_observer_updated,
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.deleted = contact_expiration_observer_deleted,
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};
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/*! \brief Callback function which deletes a contact if it has expired or sets up auto-expiry */
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static int contact_expiration_setup(void *obj, void *arg, int flags)
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{
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struct ast_sip_contact *contact = obj;
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int expires = MAX(0, ast_tvdiff_ms(contact->expiration_time, ast_tvnow()));
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if (!expires) {
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ast_sorcery_delete(ast_sip_get_sorcery(), contact);
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} else {
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contact_expiration_observer_created(contact);
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}
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return 0;
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}
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/*! \brief Initialize auto-expiration of any existing contacts */
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static void contact_expiration_initialize_existing(void)
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{
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struct ao2_container *contacts;
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contacts = ast_sorcery_retrieve_by_fields(ast_sip_get_sorcery(), "contact",
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AST_RETRIEVE_FLAG_MULTIPLE | AST_RETRIEVE_FLAG_ALL, NULL);
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if (!contacts) {
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return;
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}
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ao2_callback(contacts, OBJ_NODATA, contact_expiration_setup, NULL);
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ao2_ref(contacts, -1);
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}
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static int unload_observer_delete(void *obj, void *arg, int flags)
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{
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struct contact_expiration *expiration = obj;
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AST_SCHED_DEL_UNREF(sched, expiration->sched, ao2_cleanup(expiration));
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return CMP_MATCH;
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}
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static int unload_module(void)
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{
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ast_sorcery_observer_remove(ast_sip_get_sorcery(), "contact", &contact_expiration_observer);
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if (sched) {
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ao2_callback(contact_autoexpire, OBJ_MULTIPLE | OBJ_NODATA | OBJ_UNLINK,
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unload_observer_delete, NULL);
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ast_sched_context_destroy(sched);
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sched = NULL;
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}
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ao2_cleanup(contact_autoexpire);
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contact_autoexpire = NULL;
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return 0;
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}
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static int load_module(void)
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{
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CHECK_PJSIP_MODULE_LOADED();
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contact_autoexpire = ao2_container_alloc_options(AO2_ALLOC_OPT_LOCK_NOLOCK,
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CONTACT_AUTOEXPIRE_BUCKETS, contact_expiration_hash, contact_expiration_cmp);
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if (!contact_autoexpire) {
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ast_log(LOG_ERROR, "Could not create container for contact auto-expiration\n");
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return AST_MODULE_LOAD_FAILURE;
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}
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if (!(sched = ast_sched_context_create())) {
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ast_log(LOG_ERROR, "Could not create scheduler for contact auto-expiration\n");
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unload_module();
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return AST_MODULE_LOAD_FAILURE;
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}
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if (ast_sched_start_thread(sched)) {
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ast_log(LOG_ERROR, "Could not start scheduler thread for contact auto-expiration\n");
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unload_module();
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return AST_MODULE_LOAD_FAILURE;
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}
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contact_expiration_initialize_existing();
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if (ast_sorcery_observer_add(ast_sip_get_sorcery(), "contact", &contact_expiration_observer)) {
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ast_log(LOG_ERROR, "Could not add observer for notifications about contacts for contact auto-expiration\n");
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unload_module();
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return AST_MODULE_LOAD_FAILURE;
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}
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return AST_MODULE_LOAD_SUCCESS;
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}
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AST_MODULE_INFO(ASTERISK_GPL_KEY, AST_MODFLAG_LOAD_ORDER, "PJSIP Contact Auto-Expiration",
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.support_level = AST_MODULE_SUPPORT_CORE,
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.load = load_module,
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.unload = unload_module,
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.load_pri = AST_MODPRI_APP_DEPEND,
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);
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