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Diffstat (limited to 'trunk/main/event.c')
| -rw-r--r-- | trunk/main/event.c | 822 |
1 files changed, 822 insertions, 0 deletions
diff --git a/trunk/main/event.c b/trunk/main/event.c new file mode 100644 index 000000000..333b628a1 --- /dev/null +++ b/trunk/main/event.c @@ -0,0 +1,822 @@ +/* + * Asterisk -- An open source telephony toolkit. + * + * Copyright (C) 2007, Digium, Inc. + * + * Russell Bryant <russell@digium.com> + * + * See http://www.asterisk.org for more information about + * the Asterisk project. Please do not directly contact + * any of the maintainers of this project for assistance; + * the project provides a web site, mailing lists and IRC + * channels for your use. + * + * This program is free software, distributed under the terms of + * the GNU General Public License Version 2. See the LICENSE file + * at the top of the source tree. + */ + +/*! \file + * + * \brief Internal generic event system + * + * \author Russell Bryant <russell@digium.com> + */ + +#include "asterisk.h" + +ASTERISK_FILE_VERSION(__FILE__, "$Revision$") + +#include "asterisk/_private.h" +#include "asterisk/event.h" +#include "asterisk/linkedlists.h" +#include "asterisk/lock.h" +#include "asterisk/utils.h" +#include "asterisk/unaligned.h" + +/* Only use one thread for now to ensure ordered delivery */ +#define NUM_EVENT_THREADS 1 + +/*! + * \brief An event information element + * + * \note The format of this structure is important. Since these events may + * be sent directly over a network, changing this structure will break + * compatibility with older versions. However, at this point, this code + * has not made it into a release, so it is still fair game for change. + */ +struct ast_event_ie { + enum ast_event_ie_type ie_type:16; + /*! Total length of the IE payload */ + uint16_t ie_payload_len; + unsigned char ie_payload[0]; +} __attribute__ ((packed)); + +/*! + * \brief An event + * + * An ast_event consists of an event header (this structure), and zero or + * more information elements defined by ast_event_ie. + * + * \note The format of this structure is important. Since these events may + * be sent directly over a network, changing this structure will break + * compatibility with older versions. However, at this point, this code + * has not made it into a release, so it is still fair game for change. + */ +struct ast_event { + /*! Event type */ + enum ast_event_type type:16; + /*! Total length of the event */ + uint16_t event_len:16; + /*! The data payload of the event, made up of information elements */ + unsigned char payload[0]; +} __attribute__ ((packed)); + +struct ast_event_ref { + struct ast_event *event; + AST_LIST_ENTRY(ast_event_ref) entry; +}; + +struct ast_event_iterator { + uint16_t event_len; + const struct ast_event *event; + struct ast_event_ie *ie; +}; + +/*! \brief data shared between event dispatching threads */ +static struct { + ast_cond_t cond; + ast_mutex_t lock; + AST_LIST_HEAD_NOLOCK(, ast_event_ref) event_q; +} event_thread = { + .lock = AST_MUTEX_INIT_VALUE, +}; + +struct ast_event_ie_val { + AST_LIST_ENTRY(ast_event_ie_val) entry; + enum ast_event_ie_type ie_type; + enum ast_event_ie_pltype ie_pltype; + union { + uint32_t uint; + const char *str; + } payload; +}; + +/*! \brief Event subscription */ +struct ast_event_sub { + enum ast_event_type type; + ast_event_cb_t cb; + void *userdata; + uint32_t uniqueid; + AST_LIST_HEAD_NOLOCK(, ast_event_ie_val) ie_vals; + AST_RWLIST_ENTRY(ast_event_sub) entry; +}; + +static uint32_t sub_uniqueid; + +/*! \brief Event subscriptions + * The event subscribers are indexed by which event they are subscribed to */ +static AST_RWLIST_HEAD(ast_event_sub_list, ast_event_sub) ast_event_subs[AST_EVENT_TOTAL]; + +/*! \brief Cached events + * The event cache is indexed on the event type. The purpose of this is + * for events that express some sort of state. So, when someone first + * needs to know this state, it can get the last known state from the cache. */ +static AST_RWLIST_HEAD(ast_event_ref_list, ast_event_ref) ast_event_cache[AST_EVENT_TOTAL]; + +static void ast_event_ie_val_destroy(struct ast_event_ie_val *ie_val) +{ + if (ie_val->ie_pltype == AST_EVENT_IE_PLTYPE_STR) + ast_free((void *) ie_val->payload.str); + + ast_free(ie_val); +} + +enum ast_event_subscriber_res ast_event_check_subscriber(enum ast_event_type type, ...) +{ + va_list ap; + enum ast_event_ie_type ie_type; + enum ast_event_subscriber_res res = AST_EVENT_SUB_NONE; + struct ast_event_ie_val *ie_val, *sub_ie_val; + struct ast_event_sub *sub; + AST_LIST_HEAD_NOLOCK_STATIC(ie_vals, ast_event_ie_val); + + if (type >= AST_EVENT_TOTAL) { + ast_log(LOG_ERROR, "%u is an invalid type!\n", type); + return res; + } + + va_start(ap, type); + for (ie_type = va_arg(ap, enum ast_event_type); + ie_type != AST_EVENT_IE_END; + ie_type = va_arg(ap, enum ast_event_type)) + { + struct ast_event_ie_val *ie_val = alloca(sizeof(*ie_val)); + memset(ie_val, 0, sizeof(*ie_val)); + ie_val->ie_type = ie_type; + ie_val->ie_pltype = va_arg(ap, enum ast_event_ie_pltype); + if (ie_val->ie_pltype == AST_EVENT_IE_PLTYPE_UINT) + ie_val->payload.uint = va_arg(ap, uint32_t); + else if (ie_val->ie_pltype == AST_EVENT_IE_PLTYPE_STR) + ie_val->payload.str = ast_strdupa(va_arg(ap, const char *)); + AST_LIST_INSERT_TAIL(&ie_vals, ie_val, entry); + } + va_end(ap); + + AST_RWLIST_RDLOCK(&ast_event_subs[type]); + AST_RWLIST_TRAVERSE(&ast_event_subs[type], sub, entry) { + AST_LIST_TRAVERSE(&ie_vals, ie_val, entry) { + AST_LIST_TRAVERSE(&sub->ie_vals, sub_ie_val, entry) { + if (sub_ie_val->ie_type == ie_val->ie_type) + break; + } + if (!sub_ie_val) { + if (ie_val->ie_pltype == AST_EVENT_IE_PLTYPE_EXISTS) + break; + continue; + } + /* The subscriber doesn't actually care what the value is */ + if (sub_ie_val->ie_pltype == AST_EVENT_IE_PLTYPE_EXISTS) + continue; + if (ie_val->ie_pltype == AST_EVENT_IE_PLTYPE_UINT && + ie_val->payload.uint != sub_ie_val->payload.uint) + break; + if (ie_val->ie_pltype == AST_EVENT_IE_PLTYPE_STR && + strcmp(ie_val->payload.str, sub_ie_val->payload.str)) + break; + } + if (!ie_val) + break; + } + AST_RWLIST_UNLOCK(&ast_event_subs[type]); + + if (sub) /* All parameters were matched */ + return AST_EVENT_SUB_EXISTS; + + AST_RWLIST_RDLOCK(&ast_event_subs[AST_EVENT_ALL]); + if (!AST_LIST_EMPTY(&ast_event_subs[AST_EVENT_ALL])) + res = AST_EVENT_SUB_EXISTS; + AST_RWLIST_UNLOCK(&ast_event_subs[AST_EVENT_ALL]); + + return res; +} + +/*! \brief Send AST_EVENT_SUB events to this subscriber of ... subscriber events */ +void ast_event_report_subs(const struct ast_event_sub *event_sub) +{ + struct ast_event *event; + struct ast_event_sub *sub; + enum ast_event_type event_type = -1; + struct ast_event_ie_val *ie_val; + + if (event_sub->type != AST_EVENT_SUB) + return; + + AST_LIST_TRAVERSE(&event_sub->ie_vals, ie_val, entry) { + if (ie_val->ie_type == AST_EVENT_IE_EVENTTYPE) { + event_type = ie_val->payload.uint; + break; + } + } + + if (event_type == -1) + return; + + AST_RWLIST_RDLOCK(&ast_event_subs[event_type]); + AST_RWLIST_TRAVERSE(&ast_event_subs[event_type], sub, entry) { + if (event_sub == sub) + continue; + + event = ast_event_new(AST_EVENT_SUB, + AST_EVENT_IE_UNIQUEID, AST_EVENT_IE_PLTYPE_UINT, sub->uniqueid, + AST_EVENT_IE_EVENTTYPE, AST_EVENT_IE_PLTYPE_UINT, sub->type, + AST_EVENT_IE_END); + + AST_LIST_TRAVERSE(&sub->ie_vals, ie_val, entry) { + switch (ie_val->ie_pltype) { + case AST_EVENT_IE_PLTYPE_EXISTS: + ast_event_append_ie_uint(&event, AST_EVENT_IE_EXISTS, ie_val->ie_type); + break; + case AST_EVENT_IE_PLTYPE_UINT: + ast_event_append_ie_uint(&event, ie_val->ie_type, ie_val->payload.uint); + break; + case AST_EVENT_IE_PLTYPE_STR: + ast_event_append_ie_str(&event, ie_val->ie_type, ie_val->payload.str); + break; + } + if (!event) + break; + } + + if (!event) + continue; + + event_sub->cb(event, event_sub->userdata); + + ast_event_destroy(event); + } + AST_RWLIST_UNLOCK(&ast_event_subs[event_type]); +} + +struct ast_event_sub *ast_event_subscribe(enum ast_event_type type, ast_event_cb_t cb, + void *userdata, ...) +{ + va_list ap; + enum ast_event_ie_type ie_type; + struct ast_event_sub *sub; + struct ast_event *event; + + if (type >= AST_EVENT_TOTAL) { + ast_log(LOG_ERROR, "%u is an invalid type!\n", type); + return NULL; + } + + if (!(sub = ast_calloc(1, sizeof(*sub)))) + return NULL; + + va_start(ap, userdata); + for (ie_type = va_arg(ap, enum ast_event_type); + ie_type != AST_EVENT_IE_END; + ie_type = va_arg(ap, enum ast_event_type)) + { + struct ast_event_ie_val *ie_val; + if (!(ie_val = ast_calloc(1, sizeof(*ie_val)))) + continue; + ie_val->ie_type = ie_type; + ie_val->ie_pltype = va_arg(ap, enum ast_event_ie_pltype); + if (ie_val->ie_pltype == AST_EVENT_IE_PLTYPE_UINT) + ie_val->payload.uint = va_arg(ap, uint32_t); + else if (ie_val->ie_pltype == AST_EVENT_IE_PLTYPE_STR) { + if (!(ie_val->payload.str = ast_strdup(va_arg(ap, const char *)))) { + ast_free(ie_val); + continue; + } + } + AST_LIST_INSERT_TAIL(&sub->ie_vals, ie_val, entry); + } + va_end(ap); + + sub->type = type; + sub->cb = cb; + sub->userdata = userdata; + sub->uniqueid = ast_atomic_fetchadd_int((int *) &sub_uniqueid, 1); + + if (ast_event_check_subscriber(AST_EVENT_SUB, + AST_EVENT_IE_EVENTTYPE, AST_EVENT_IE_PLTYPE_UINT, type, + AST_EVENT_IE_END) != AST_EVENT_SUB_NONE) { + struct ast_event_ie_val *ie_val; + + event = ast_event_new(AST_EVENT_SUB, + AST_EVENT_IE_UNIQUEID, AST_EVENT_IE_PLTYPE_UINT, sub->uniqueid, + AST_EVENT_IE_EVENTTYPE, AST_EVENT_IE_PLTYPE_UINT, sub->type, + AST_EVENT_IE_END); + + AST_LIST_TRAVERSE(&sub->ie_vals, ie_val, entry) { + switch (ie_val->ie_pltype) { + case AST_EVENT_IE_PLTYPE_EXISTS: + ast_event_append_ie_uint(&event, AST_EVENT_IE_EXISTS, ie_val->ie_type); + break; + case AST_EVENT_IE_PLTYPE_UINT: + ast_event_append_ie_uint(&event, ie_val->ie_type, ie_val->payload.uint); + break; + case AST_EVENT_IE_PLTYPE_STR: + ast_event_append_ie_str(&event, ie_val->ie_type, ie_val->payload.str); + break; + } + if (!event) + break; + } + + if (event) + ast_event_queue(event); + } + + AST_RWLIST_WRLOCK(&ast_event_subs[type]); + AST_RWLIST_INSERT_TAIL(&ast_event_subs[type], sub, entry); + AST_RWLIST_UNLOCK(&ast_event_subs[type]); + + return sub; +} + +static void ast_event_sub_destroy(struct ast_event_sub *sub) +{ + struct ast_event_ie_val *ie_val; + + while ((ie_val = AST_LIST_REMOVE_HEAD(&sub->ie_vals, entry))) + ast_event_ie_val_destroy(ie_val); + + ast_free(sub); +} + +void ast_event_unsubscribe(struct ast_event_sub *sub) +{ + struct ast_event *event; + + AST_RWLIST_WRLOCK(&ast_event_subs[sub->type]); + AST_LIST_REMOVE(&ast_event_subs[sub->type], sub, entry); + AST_RWLIST_UNLOCK(&ast_event_subs[sub->type]); + + if (ast_event_check_subscriber(AST_EVENT_UNSUB, + AST_EVENT_IE_EVENTTYPE, AST_EVENT_IE_PLTYPE_UINT, sub->type, + AST_EVENT_IE_END) != AST_EVENT_SUB_NONE) { + + event = ast_event_new(AST_EVENT_UNSUB, + AST_EVENT_IE_UNIQUEID, AST_EVENT_IE_PLTYPE_UINT, sub->uniqueid, + AST_EVENT_IE_EVENTTYPE, AST_EVENT_IE_PLTYPE_UINT, sub->type, + AST_EVENT_IE_END); + + if (event) + ast_event_queue(event); + } + + ast_event_sub_destroy(sub); +} + +void ast_event_iterator_init(struct ast_event_iterator *iterator, const struct ast_event *event) +{ + iterator->event_len = ntohs(event->event_len); + iterator->event = event; + iterator->ie = (struct ast_event_ie *) ( ((char *) event) + sizeof(*event) ); + return; +} + +int ast_event_iterator_next(struct ast_event_iterator *iterator) +{ + iterator->ie = (struct ast_event_ie *) ( ((char *) iterator->ie) + sizeof(*iterator->ie) + ntohs(iterator->ie->ie_payload_len)); + return ((iterator->event_len < (((char *) iterator->ie) - ((char *) iterator->event))) ? -1 : 0); +} + +enum ast_event_ie_type ast_event_iterator_get_ie_type(struct ast_event_iterator *iterator) +{ + return iterator->ie->ie_type; +} + +uint32_t ast_event_iterator_get_ie_uint(struct ast_event_iterator *iterator) +{ + return ntohl(get_unaligned_uint32(iterator->ie->ie_payload)); +} + +const char *ast_event_iterator_get_ie_str(struct ast_event_iterator *iterator) +{ + return (const char*)iterator->ie->ie_payload; +} + +void *ast_event_iterator_get_ie_raw(struct ast_event_iterator *iterator) +{ + return iterator->ie->ie_payload; +} + +enum ast_event_type ast_event_get_type(const struct ast_event *event) +{ + return ntohs(event->type); +} + +uint32_t ast_event_get_ie_uint(const struct ast_event *event, enum ast_event_ie_type ie_type) +{ + const uint32_t *ie_val; + + ie_val = ast_event_get_ie_raw(event, ie_type); + + return ie_val ? ntohl(get_unaligned_uint32(ie_val)) : 0; +} + +const char *ast_event_get_ie_str(const struct ast_event *event, enum ast_event_ie_type ie_type) +{ + return ast_event_get_ie_raw(event, ie_type); +} + +const void *ast_event_get_ie_raw(const struct ast_event *event, enum ast_event_ie_type ie_type) +{ + struct ast_event_iterator iterator; + int res = 0; + + ie_type = ntohs(ie_type); + + for (ast_event_iterator_init(&iterator, event); !res; res = ast_event_iterator_next(&iterator)) { + if (ast_event_iterator_get_ie_type(&iterator) == ie_type) + return ast_event_iterator_get_ie_raw(&iterator); + } + + return NULL; +} + +int ast_event_append_ie_str(struct ast_event **event, enum ast_event_ie_type ie_type, + const char *str) +{ + return ast_event_append_ie_raw(event, ie_type, str, strlen(str) + 1); +} + +int ast_event_append_ie_uint(struct ast_event **event, enum ast_event_ie_type ie_type, + uint32_t data) +{ + data = htonl(data); + return ast_event_append_ie_raw(event, ie_type, &data, sizeof(data)); +} + +int ast_event_append_ie_raw(struct ast_event **event, enum ast_event_ie_type ie_type, + const void *data, size_t data_len) +{ + struct ast_event_ie *ie; + unsigned int extra_len; + uint16_t event_len; + + event_len = ntohs((*event)->event_len); + extra_len = sizeof(*ie) + data_len; + + if (!(*event = ast_realloc(*event, event_len + extra_len))) + return -1; + + ie = (struct ast_event_ie *) ( ((char *) *event) + event_len ); + ie->ie_type = htons(ie_type); + ie->ie_payload_len = htons(data_len); + memcpy(ie->ie_payload, data, data_len); + + (*event)->event_len = htons(event_len + extra_len); + + return 0; +} + +struct ast_event *ast_event_new(enum ast_event_type type, ...) +{ + va_list ap; + struct ast_event *event; + enum ast_event_type ie_type; + struct ast_event_ie_val *ie_val; + AST_LIST_HEAD_NOLOCK_STATIC(ie_vals, ast_event_ie_val); + + /* Invalid type */ + if (type >= AST_EVENT_TOTAL) { + ast_log(LOG_WARNING, "Someone tried to create an event of invalid " + "type '%d'!\n", type); + return NULL; + } + + va_start(ap, type); + for (ie_type = va_arg(ap, enum ast_event_type); + ie_type != AST_EVENT_IE_END; + ie_type = va_arg(ap, enum ast_event_type)) + { + struct ast_event_ie_val *ie_val = alloca(sizeof(*ie_val)); + memset(ie_val, 0, sizeof(*ie_val)); + ie_val->ie_type = ie_type; + ie_val->ie_pltype = va_arg(ap, enum ast_event_ie_pltype); + if (ie_val->ie_pltype == AST_EVENT_IE_PLTYPE_UINT) + ie_val->payload.uint = va_arg(ap, uint32_t); + else if (ie_val->ie_pltype == AST_EVENT_IE_PLTYPE_STR) + ie_val->payload.str = ast_strdupa(va_arg(ap, const char *)); + AST_LIST_INSERT_TAIL(&ie_vals, ie_val, entry); + } + va_end(ap); + + if (!(event = ast_calloc(1, sizeof(*event)))) + return NULL; + + event->type = htons(type); + event->event_len = htons(sizeof(*event)); + + AST_LIST_TRAVERSE(&ie_vals, ie_val, entry) { + if (ie_val->ie_pltype == AST_EVENT_IE_PLTYPE_STR) + ast_event_append_ie_str(&event, ie_val->ie_type, ie_val->payload.str); + else if (ie_val->ie_pltype == AST_EVENT_IE_PLTYPE_UINT) + ast_event_append_ie_uint(&event, ie_val->ie_type, ie_val->payload.uint); + + if (!event) + break; + } + + return event; +} + +void ast_event_destroy(struct ast_event *event) +{ + ast_free(event); +} + +static void ast_event_ref_destroy(struct ast_event_ref *event_ref) +{ + ast_event_destroy(event_ref->event); + ast_free(event_ref); +} + +static struct ast_event *ast_event_dup(const struct ast_event *event) +{ + struct ast_event *dup_event; + uint16_t event_len; + + event_len = ntohs(event->event_len); + + if (!(dup_event = ast_calloc(1, event_len))) + return NULL; + + memcpy(dup_event, event, event_len); + + return dup_event; +} + +struct ast_event *ast_event_get_cached(enum ast_event_type type, ...) +{ + va_list ap; + enum ast_event_ie_type ie_type; + struct ast_event *dup_event = NULL; + struct ast_event_ref *event_ref; + struct cache_arg { + AST_LIST_ENTRY(cache_arg) entry; + enum ast_event_ie_type ie_type; + enum ast_event_ie_pltype ie_pltype; + union { + uint32_t uint; + const char *str; + } payload; + } *cache_arg; + AST_LIST_HEAD_NOLOCK_STATIC(cache_args, cache_arg); + + if (type >= AST_EVENT_TOTAL) { + ast_log(LOG_ERROR, "%u is an invalid type!\n", type); + return NULL; + } + + va_start(ap, type); + for (ie_type = va_arg(ap, enum ast_event_type); + ie_type != AST_EVENT_IE_END; + ie_type = va_arg(ap, enum ast_event_type)) + { + cache_arg = alloca(sizeof(*cache_arg)); + memset(cache_arg, 0, sizeof(*cache_arg)); + cache_arg->ie_type = ie_type; + cache_arg->ie_pltype = va_arg(ap, enum ast_event_ie_pltype); + if (cache_arg->ie_pltype == AST_EVENT_IE_PLTYPE_UINT) + cache_arg->payload.uint = va_arg(ap, uint32_t); + else if (cache_arg->ie_pltype == AST_EVENT_IE_PLTYPE_STR) + cache_arg->payload.str = ast_strdupa(va_arg(ap, const char *)); + AST_LIST_INSERT_TAIL(&cache_args, cache_arg, entry); + } + va_end(ap); + + if (AST_LIST_EMPTY(&cache_args)) { + ast_log(LOG_ERROR, "Events can not be retrieved from the cache without " + "specifying at least one IE type!\n"); + return NULL; + } + + AST_RWLIST_RDLOCK(&ast_event_cache[type]); + AST_RWLIST_TRAVERSE_SAFE_BEGIN(&ast_event_cache[type], event_ref, entry) { + AST_LIST_TRAVERSE(&cache_args, cache_arg, entry) { + if ( ! ( (cache_arg->ie_pltype == AST_EVENT_IE_PLTYPE_UINT && + (cache_arg->payload.uint == + ast_event_get_ie_uint(event_ref->event, cache_arg->ie_type))) || + + (cache_arg->ie_pltype == AST_EVENT_IE_PLTYPE_STR && + (!strcmp(cache_arg->payload.str, + ast_event_get_ie_str(event_ref->event, cache_arg->ie_type)))) || + + (cache_arg->ie_pltype == AST_EVENT_IE_PLTYPE_EXISTS && + ast_event_get_ie_raw(event_ref->event, cache_arg->ie_type)) ) ) + { + break; + } + } + if (!cache_arg) { + /* All parameters were matched on this cache entry, so return it */ + dup_event = ast_event_dup(event_ref->event); + break; + } + } + AST_RWLIST_TRAVERSE_SAFE_END + AST_RWLIST_UNLOCK(&ast_event_cache[type]); + + return dup_event; +} + +/*! \brief Duplicate an event and add it to the cache + * \note This assumes this index in to the cache is locked */ +static int ast_event_dup_and_cache(const struct ast_event *event) +{ + struct ast_event *dup_event; + struct ast_event_ref *event_ref; + + if (!(dup_event = ast_event_dup(event))) + return -1; + if (!(event_ref = ast_calloc(1, sizeof(*event_ref)))) + return -1; + + event_ref->event = dup_event; + + AST_LIST_INSERT_TAIL(&ast_event_cache[ntohs(event->type)], event_ref, entry); + + return 0; +} + +int ast_event_queue_and_cache(struct ast_event *event, ...) +{ + va_list ap; + enum ast_event_type ie_type; + uint16_t host_event_type; + struct ast_event_ref *event_ref; + int res; + struct cache_arg { + AST_LIST_ENTRY(cache_arg) entry; + enum ast_event_ie_type ie_type; + enum ast_event_ie_pltype ie_pltype; + } *cache_arg; + AST_LIST_HEAD_NOLOCK_STATIC(cache_args, cache_arg); + + host_event_type = ntohs(event->type); + + /* Invalid type */ + if (host_event_type >= AST_EVENT_TOTAL) { + ast_log(LOG_WARNING, "Someone tried to queue an event of invalid " + "type '%d'!\n", host_event_type); + return -1; + } + + va_start(ap, event); + for (ie_type = va_arg(ap, enum ast_event_type); + ie_type != AST_EVENT_IE_END; + ie_type = va_arg(ap, enum ast_event_type)) + { + cache_arg = alloca(sizeof(*cache_arg)); + memset(cache_arg, 0, sizeof(*cache_arg)); + cache_arg->ie_type = ie_type; + cache_arg->ie_pltype = va_arg(ap, enum ast_event_ie_pltype); + AST_LIST_INSERT_TAIL(&cache_args, cache_arg, entry); + } + va_end(ap); + + if (AST_LIST_EMPTY(&cache_args)) { + ast_log(LOG_ERROR, "Events can not be cached without specifying at " + "least one IE type!\n"); + return ast_event_queue(event); + } + + AST_RWLIST_WRLOCK(&ast_event_cache[host_event_type]); + AST_RWLIST_TRAVERSE_SAFE_BEGIN(&ast_event_cache[host_event_type], event_ref, entry) { + AST_LIST_TRAVERSE(&cache_args, cache_arg, entry) { + if ( ! ( (cache_arg->ie_pltype == AST_EVENT_IE_PLTYPE_UINT && + (ast_event_get_ie_uint(event, cache_arg->ie_type) == + ast_event_get_ie_uint(event_ref->event, cache_arg->ie_type))) || + + (cache_arg->ie_pltype == AST_EVENT_IE_PLTYPE_STR && + (!strcmp(ast_event_get_ie_str(event, cache_arg->ie_type), + ast_event_get_ie_str(event_ref->event, cache_arg->ie_type)))) || + + (cache_arg->ie_pltype == AST_EVENT_IE_PLTYPE_EXISTS && + ast_event_get_ie_raw(event_ref->event, cache_arg->ie_type)) ) ) + { + break; + } + } + if (!cache_arg) { + /* All parameters were matched on this cache entry, so remove it */ + AST_LIST_REMOVE_CURRENT(entry); + ast_event_ref_destroy(event_ref); + } + } + AST_RWLIST_TRAVERSE_SAFE_END; + res = ast_event_dup_and_cache(event); + AST_RWLIST_UNLOCK(&ast_event_cache[host_event_type]); + + return (ast_event_queue(event) || res) ? -1 : 0; +} + +int ast_event_queue(struct ast_event *event) +{ + struct ast_event_ref *event_ref; + uint16_t host_event_type; + + host_event_type = ntohs(event->type); + + /* Invalid type */ + if (host_event_type >= AST_EVENT_TOTAL) { + ast_log(LOG_WARNING, "Someone tried to queue an event of invalid " + "type '%d'!\n", host_event_type); + return -1; + } + + /* If nobody has subscribed to this event type, throw it away now */ + if (ast_event_check_subscriber(host_event_type, AST_EVENT_IE_END) + == AST_EVENT_SUB_NONE) { + ast_event_destroy(event); + return 0; + } + + if (!(event_ref = ast_calloc(1, sizeof(*event_ref)))) + return -1; + + event_ref->event = event; + + ast_mutex_lock(&event_thread.lock); + AST_LIST_INSERT_TAIL(&event_thread.event_q, event_ref, entry); + ast_cond_signal(&event_thread.cond); + ast_mutex_unlock(&event_thread.lock); + + return 0; +} + +static void *ast_event_dispatcher(void *unused) +{ + for (;;) { + struct ast_event_ref *event_ref; + struct ast_event_sub *sub; + uint16_t host_event_type; + + ast_mutex_lock(&event_thread.lock); + while (!(event_ref = AST_LIST_REMOVE_HEAD(&event_thread.event_q, entry))) + ast_cond_wait(&event_thread.cond, &event_thread.lock); + ast_mutex_unlock(&event_thread.lock); + + host_event_type = ntohs(event_ref->event->type); + + /* Subscribers to this specific event first */ + AST_RWLIST_RDLOCK(&ast_event_subs[host_event_type]); + AST_RWLIST_TRAVERSE(&ast_event_subs[host_event_type], sub, entry) { + struct ast_event_ie_val *ie_val; + AST_LIST_TRAVERSE(&sub->ie_vals, ie_val, entry) { + if (ie_val->ie_pltype == AST_EVENT_IE_PLTYPE_EXISTS && + ast_event_get_ie_raw(event_ref->event, ie_val->ie_type)) { + continue; + } else if (ie_val->ie_pltype == AST_EVENT_IE_PLTYPE_UINT && + ast_event_get_ie_uint(event_ref->event, ie_val->ie_type) + == ie_val->payload.uint) { + continue; + } else if (ie_val->ie_pltype == AST_EVENT_IE_PLTYPE_STR && + !strcmp(ast_event_get_ie_str(event_ref->event, ie_val->ie_type), + ie_val->payload.str)) { + continue; + } + break; + } + if (ie_val) + continue; + sub->cb(event_ref->event, sub->userdata); + } + AST_RWLIST_UNLOCK(&ast_event_subs[host_event_type]); + + /* Now to subscribers to all event types */ + AST_RWLIST_RDLOCK(&ast_event_subs[AST_EVENT_ALL]); + AST_RWLIST_TRAVERSE(&ast_event_subs[AST_EVENT_ALL], sub, entry) + sub->cb(event_ref->event, sub->userdata); + AST_RWLIST_UNLOCK(&ast_event_subs[AST_EVENT_ALL]); + + ast_event_ref_destroy(event_ref); + } + + return NULL; +} + +void ast_event_init(void) +{ + int i; + + for (i = 0; i < AST_EVENT_TOTAL; i++) + AST_RWLIST_HEAD_INIT(&ast_event_subs[i]); + + for (i = 0; i < AST_EVENT_TOTAL; i++) + AST_RWLIST_HEAD_INIT(&ast_event_cache[i]); + + ast_cond_init(&event_thread.cond, NULL); + + for (i = 0; i < NUM_EVENT_THREADS; i++) { + pthread_t dont_care; + ast_pthread_create_background(&dont_care, NULL, ast_event_dispatcher, NULL); + } +} |