mirror of
https://github.com/strophe/libstrophe.git
synced 2026-07-19 04:16:20 +00:00
691 lines
21 KiB
C
691 lines
21 KiB
C
/* handler.c
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** strophe XMPP client library -- event handler management
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**
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** Copyright (C) 2005-2009 Collecta, Inc.
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**
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** This software is provided AS-IS with no warranty, either express
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** or implied.
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**
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** This program is dual licensed under the MIT and GPLv3 licenses.
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*/
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/** @file
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* Event handler management.
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*/
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/** @defgroup Handlers Stanza and timed event handlers
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include "strophe.h"
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#include "common.h"
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#include "ostypes.h"
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/* Remove item from the list pointed by head, but don't free it.
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* There can be a situation when user's handler deletes another handler which
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* is the previous in the list. handler_fire_stanza() and handler_fire_timed()
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* must handle this situation correctly. Current function helps to avoid
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* list corruption in described scenario.
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*
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* TODO Convert handler lists to double-linked lists. Current implementation
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* works for O(n).
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*/
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static void _handler_item_remove(xmpp_handlist_t **head,
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xmpp_handlist_t *item)
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{
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xmpp_handlist_t *i = *head;
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if (i == item)
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*head = item->next;
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else if (i != NULL) {
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while (i->next != NULL && i->next != item)
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i = i->next;
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if (i->next == item) {
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i->next = item->next;
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}
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}
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}
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/** Fire off all stanza handlers that match.
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* This function is called internally by the event loop whenever stanzas
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* are received from the XMPP server.
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*
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* @param conn a Strophe connection object
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* @param stanza a Strophe stanza object
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*/
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void handler_fire_stanza(xmpp_conn_t * const conn,
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xmpp_stanza_t * const stanza)
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{
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xmpp_handlist_t *item, *next, *head, *head_old;
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const char *id, *ns, *name, *type;
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int ret;
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/* call id handlers */
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id = xmpp_stanza_get_id(stanza);
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if (id) {
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head = (xmpp_handlist_t *)hash_get(conn->id_handlers, id);
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/* enable all added handlers */
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for (item = head; item; item = item->next)
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item->enabled = 1;
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item = head;
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while (item) {
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/* don't fire user handlers until authentication succeeds and
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and skip newly added handlers */
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if ((item->user_handler && !conn->authenticated) || !item->enabled) {
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item = item->next;
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continue;
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}
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ret = ((xmpp_handler)(item->handler))(conn, stanza, item->userdata);
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next = item->next;
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if (!ret) {
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/* handler is one-shot, so delete it */
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head_old = head;
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_handler_item_remove(&head, item);
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if (head != head_old) {
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/* replace old value */
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hash_add(conn->id_handlers, id, head);
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}
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xmpp_free(conn->ctx, item->id);
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xmpp_free(conn->ctx, item);
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}
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item = next;
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}
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}
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/* call handlers */
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ns = xmpp_stanza_get_ns(stanza);
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name = xmpp_stanza_get_name(stanza);
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type = xmpp_stanza_get_type(stanza);
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/* enable all added handlers */
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for (item = conn->handlers; item; item = item->next)
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item->enabled = 1;
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item = conn->handlers;
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while (item) {
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/* don't fire user handlers until authentication succeeds and
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skip newly added handlers */
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if ((item->user_handler && !conn->authenticated) || !item->enabled) {
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item = item->next;
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continue;
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}
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next = item->next;
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if ((!item->ns || (ns && strcmp(ns, item->ns) == 0) ||
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xmpp_stanza_get_child_by_ns(stanza, item->ns)) &&
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(!item->name || (name && strcmp(name, item->name) == 0)) &&
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(!item->type || (type && strcmp(type, item->type) == 0))) {
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ret = ((xmpp_handler)(item->handler))(conn, stanza, item->userdata);
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/* list may be changed during execution of a handler */
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next = item->next;
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if (!ret) {
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/* handler is one-shot, so delete it */
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_handler_item_remove(&conn->handlers, item);
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if (item->ns) xmpp_free(conn->ctx, item->ns);
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if (item->name) xmpp_free(conn->ctx, item->name);
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if (item->type) xmpp_free(conn->ctx, item->type);
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xmpp_free(conn->ctx, item);
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}
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}
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item = next;
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}
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}
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/** Fire off all timed handlers that are ready.
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* This function is called internally by the event loop.
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*
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* @param ctx a Strophe context object
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*
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* @return the time in milliseconds until the next handler will be ready
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*/
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uint64_t handler_fire_timed(xmpp_ctx_t * const ctx)
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{
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xmpp_connlist_t *connitem;
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xmpp_handlist_t *item, *next;
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xmpp_conn_t *conn;
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uint64_t elapsed, min;
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uint64_t timestamp;
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int ret;
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min = (uint64_t)(-1);
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connitem = ctx->connlist;
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while (connitem) {
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conn = connitem->conn;
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if (conn->state != XMPP_STATE_CONNECTED) {
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connitem = connitem->next;
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continue;
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}
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/* enable all handlers that were added */
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for (item = conn->timed_handlers; item; item = item->next)
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item->enabled = 1;
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item = conn->timed_handlers;
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while (item) {
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/* don't fire user handlers until authentication succeeds and
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skip newly added handlers */
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if ((item->user_handler && !conn->authenticated) || !item->enabled) {
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item = item->next;
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continue;
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}
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next = item->next;
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timestamp = time_stamp();
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elapsed = time_elapsed(item->last_stamp, timestamp);
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if (elapsed >= item->period) {
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/* fire! */
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item->last_stamp = timestamp;
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ret = ((xmpp_timed_handler)item->handler)(conn, item->userdata);
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/* list may be changed during execution of a handler */
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next = item->next;
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if (!ret) {
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/* delete handler if it returned false */
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_handler_item_remove(&conn->timed_handlers, item);
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xmpp_free(conn->ctx, item);
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}
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} else if (min > (item->period - elapsed))
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min = item->period - elapsed;
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item = next;
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}
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connitem = connitem->next;
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}
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return min;
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}
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/** Reset all timed handlers.
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* This function is called internally when a connection is successful.
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*
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* @param conn a Strophe connection object
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* @param user_only whether to reset all handlers or only user ones
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*/
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void handler_reset_timed(xmpp_conn_t *conn, int user_only)
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{
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xmpp_handlist_t *handitem;
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handitem = conn->timed_handlers;
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while (handitem) {
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if ((user_only && handitem->user_handler) || !user_only)
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handitem->last_stamp = time_stamp();
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handitem = handitem->next;
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}
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}
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static void _timed_handler_add(xmpp_conn_t * const conn,
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xmpp_timed_handler handler,
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const unsigned long period,
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void * const userdata,
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const int user_handler)
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{
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xmpp_handlist_t *item, *tail;
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/* check if handler is already in the list */
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for (item = conn->timed_handlers; item; item = item->next) {
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if (item->handler == handler && item->userdata == userdata) {
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xmpp_warn(conn->ctx, "xmpp", "Timed handler already exists.");
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break;
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}
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}
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if (item) return;
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/* build new item */
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item = xmpp_alloc(conn->ctx, sizeof(xmpp_handlist_t));
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if (!item) return;
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item->user_handler = user_handler;
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item->handler = handler;
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item->userdata = userdata;
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item->enabled = 0;
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item->next = NULL;
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item->period = period;
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item->last_stamp = time_stamp();
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/* append item to list */
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if (!conn->timed_handlers)
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conn->timed_handlers = item;
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else {
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tail = conn->timed_handlers;
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while (tail->next)
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tail = tail->next;
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tail->next = item;
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}
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}
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/** Delete a timed handler.
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*
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* @param conn a Strophe connection object
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* @param handler function pointer to the handler
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*
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* @ingroup Handlers
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*/
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void xmpp_timed_handler_delete(xmpp_conn_t * const conn,
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xmpp_timed_handler handler)
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{
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xmpp_handlist_t *item, *prev;
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if (!conn->timed_handlers) return;
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prev = NULL;
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item = conn->timed_handlers;
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while (item) {
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if (item->handler == handler) {
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if (prev)
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prev->next = item->next;
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else
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conn->timed_handlers = item->next;
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xmpp_free(conn->ctx, item);
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item = prev ? prev->next : conn->timed_handlers;
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} else {
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prev = item;
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item = item->next;
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}
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}
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}
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static void _id_handler_add(xmpp_conn_t * const conn,
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xmpp_handler handler,
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const char * const id,
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void * const userdata, int user_handler)
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{
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xmpp_handlist_t *item, *tail;
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/* check if handler is already in the list */
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item = (xmpp_handlist_t *)hash_get(conn->id_handlers, id);
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while (item) {
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if (item->handler == handler && item->userdata == userdata) {
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xmpp_warn(conn->ctx, "xmpp", "Id handler already exists.");
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break;
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}
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item = item->next;
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}
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if (item) return;
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/* build new item */
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item = xmpp_alloc(conn->ctx, sizeof(xmpp_handlist_t));
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if (!item) return;
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item->user_handler = user_handler;
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item->handler = handler;
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item->userdata = userdata;
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item->enabled = 0;
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item->next = NULL;
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item->id = xmpp_strdup(conn->ctx, id);
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if (!item->id) {
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xmpp_free(conn->ctx, item);
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return;
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}
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/* put on list in hash table */
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tail = (xmpp_handlist_t *)hash_get(conn->id_handlers, id);
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if (!tail)
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hash_add(conn->id_handlers, id, item);
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else {
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while (tail->next)
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tail = tail->next;
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tail->next = item;
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}
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}
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/** Delete an id based stanza handler.
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*
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* @param conn a Strophe connection object
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* @param handler a function pointer to a stanza handler
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* @param id a string containing the id the handler is for
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*
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* @ingroup Handlers
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*/
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void xmpp_id_handler_delete(xmpp_conn_t * const conn,
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xmpp_handler handler,
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const char * const id)
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{
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xmpp_handlist_t *item, *prev, *next;
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prev = NULL;
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item = (xmpp_handlist_t *)hash_get(conn->id_handlers, id);
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if (!item) return;
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while (item) {
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next = item->next;
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if (item->handler == handler) {
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if (prev)
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prev->next = next;
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else {
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hash_drop(conn->id_handlers, id);
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hash_add(conn->id_handlers, id, next);
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}
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xmpp_free(conn->ctx, item->id);
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xmpp_free(conn->ctx, item);
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item = next;
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} else {
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prev = item;
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item = next;
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}
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}
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}
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/* add a stanza handler */
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static void _handler_add(xmpp_conn_t * const conn,
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xmpp_handler handler,
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const char * const ns,
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const char * const name,
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const char * const type,
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void * const userdata, int user_handler)
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{
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xmpp_handlist_t *item, *tail;
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/* check if handler already in list */
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for (item = conn->handlers; item; item = item->next) {
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/* same handler function can process different stanzas and
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distinguish them according to userdata. */
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if (item->handler == handler && item->userdata == userdata) {
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xmpp_warn(conn->ctx, "xmpp", "Stanza handler already exists.");
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break;
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}
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}
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if (item) return;
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/* build new item */
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item = (xmpp_handlist_t *)xmpp_alloc(conn->ctx, sizeof(xmpp_handlist_t));
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if (!item) return;
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item->user_handler = user_handler;
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item->handler = handler;
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item->userdata = userdata;
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item->enabled = 0;
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item->next = NULL;
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if (ns) {
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item->ns = xmpp_strdup(conn->ctx, ns);
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if (!item->ns) {
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xmpp_free(conn->ctx, item);
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return;
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}
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} else
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item->ns = NULL;
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if (name) {
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item->name = xmpp_strdup(conn->ctx, name);
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if (!item->name) {
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if (item->ns) xmpp_free(conn->ctx, item->ns);
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xmpp_free(conn->ctx, item);
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return;
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}
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} else
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item->name = NULL;
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if (type) {
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item->type = xmpp_strdup(conn->ctx, type);
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if (!item->type) {
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if (item->ns) xmpp_free(conn->ctx, item->ns);
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if (item->name) xmpp_free(conn->ctx, item->name);
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xmpp_free(conn->ctx, item);
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}
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} else
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item->type = NULL;
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/* append to list */
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if (!conn->handlers)
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conn->handlers = item;
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else {
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tail = conn->handlers;
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while (tail->next)
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tail = tail->next;
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tail->next = item;
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}
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}
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/** Delete a stanza handler.
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*
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* @param conn a Strophe connection object
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* @param handler a function pointer to a stanza handler
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*
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* @ingroup Handlers
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*/
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void xmpp_handler_delete(xmpp_conn_t * const conn,
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xmpp_handler handler)
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{
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xmpp_handlist_t *prev, *item;
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if (!conn->handlers) return;
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prev = NULL;
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item = conn->handlers;
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while (item) {
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if (item->handler == handler) {
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if (prev)
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prev->next = item->next;
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else
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conn->handlers = item->next;
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if (item->ns) xmpp_free(conn->ctx, item->ns);
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if (item->name) xmpp_free(conn->ctx, item->name);
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if (item->type) xmpp_free(conn->ctx, item->type);
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xmpp_free(conn->ctx, item);
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item = prev ? prev->next : conn->handlers;
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} else {
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prev = item;
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item = item->next;
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}
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}
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}
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/** Add a timed handler.
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* The handler will fire for the first time once the period has elapsed,
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* and continue firing regularly after that. Strophe will try its best
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* to fire handlers as close to the period times as it can, but accuracy
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* will vary depending on the resolution of the event loop.
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*
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* If the handler function returns true, it will be kept, and if it
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* returns false, it will be deleted from the list of handlers.
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*
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* @param conn a Strophe connection object
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* @param handler a function pointer to a timed handler
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* @param period the time in milliseconds between firings
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* @param userdata an opaque data pointer that will be passed to the handler
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*
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* @ingroup Handlers
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*/
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void xmpp_timed_handler_add(xmpp_conn_t * const conn,
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xmpp_timed_handler handler,
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const unsigned long period,
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void * const userdata)
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{
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_timed_handler_add(conn, handler, period, userdata, 1);
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}
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/** Add a timed system handler.
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* This function is used to add internal timed handlers and should not be
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* used outside of the library.
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*
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* @param conn a Strophe connection object
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* @param handler a function pointer to a timed handler
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* @param period the time in milliseconds between firings
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* @param userdata an opaque data pointer that will be passed to the handler
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*/
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void handler_add_timed(xmpp_conn_t * const conn,
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xmpp_timed_handler handler,
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const unsigned long period,
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void * const userdata)
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{
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_timed_handler_add(conn, handler, period, userdata, 0);
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}
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/** Add an id based stanza handler.
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* This function adds a stanza handler for an <iq/> stanza of
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* type 'result' or 'error' with a specific id attribute. This can
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* be used to handle responses to specific <iq/>s.
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*
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* If the handler function returns true, it will be kept, and if it
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* returns false, it will be deleted from the list of handlers.
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*
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* @param conn a Strophe connection object
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* @param handler a function pointer to a stanza handler
|
|
* @param id a string with the id
|
|
* @param userdata an opaque data pointer that will be passed to the handler
|
|
*
|
|
* @ingroup Handlers
|
|
*/
|
|
void xmpp_id_handler_add(xmpp_conn_t * const conn,
|
|
xmpp_handler handler,
|
|
const char * const id,
|
|
void * const userdata)
|
|
{
|
|
_id_handler_add(conn, handler, id, userdata, 1);
|
|
}
|
|
|
|
/** Add an id based system stanza handler.
|
|
* This function is used to add internal id based stanza handlers and should
|
|
* not be used outside of the library.
|
|
*
|
|
* @param conn a Strophe connection object
|
|
* @param handler a function pointer to a stanza handler
|
|
* @param id a string with the id
|
|
* @param userdata an opaque data pointer that will be passed to the handler
|
|
*/
|
|
void handler_add_id(xmpp_conn_t * const conn,
|
|
xmpp_handler handler,
|
|
const char * const id,
|
|
void * const userdata)
|
|
{
|
|
_id_handler_add(conn, handler, id, userdata, 0);
|
|
}
|
|
|
|
/** Add a stanza handler.
|
|
* This function is used to add a stanza handler to a connection.
|
|
* The handler will be called when the any of the filters match. The
|
|
* name filter matches to the top level stanza name. The type filter
|
|
* matches the 'type' attribute of the top level stanza. The ns
|
|
* filter matches the namespace ('xmlns' attribute) of either the top
|
|
* level stanza or any of it's immediate children (this allows you do
|
|
* handle specific <iq/> stanzas based on the <query/>
|
|
* child namespace.
|
|
*
|
|
* If the handler function returns true, it will be kept, and if it
|
|
* returns false, it will be deleted from the list of handlers.
|
|
*
|
|
* @param conn a Strophe connection object
|
|
* @param handler a function pointer to a stanza handler
|
|
* @param ns a string with the namespace to match
|
|
* @param name a string with the stanza name to match
|
|
* @param type a string with the 'type' attribute to match
|
|
* @param userdata an opaque data pointer that will be passed to the handler
|
|
*
|
|
* @ingroup Handlers
|
|
*/
|
|
void xmpp_handler_add(xmpp_conn_t * const conn,
|
|
xmpp_handler handler,
|
|
const char * const ns,
|
|
const char * const name,
|
|
const char * const type,
|
|
void * const userdata)
|
|
{
|
|
_handler_add(conn, handler, ns, name, type, userdata, 1);
|
|
}
|
|
|
|
/** Add a system stanza handler.
|
|
* This function is used to add internal stanza handlers and should
|
|
* not be used outside of the library.
|
|
*
|
|
* @param conn a Strophe connection object
|
|
* @param handler a function pointer to a stanza handler
|
|
* @param ns a string with the namespace to match
|
|
* @param name a string with the stanza name to match
|
|
* @param type a string with the 'type' attribute value to match
|
|
* @param userdata an opaque data pointer that will be passed to the handler
|
|
*/
|
|
void handler_add(xmpp_conn_t * const conn,
|
|
xmpp_handler handler,
|
|
const char * const ns,
|
|
const char * const name,
|
|
const char * const type,
|
|
void * const userdata)
|
|
{
|
|
_handler_add(conn, handler, ns, name, type, userdata, 0);
|
|
}
|
|
|
|
/** Delete all system handlers.
|
|
* This function is used to reset conn object before re-connecting.
|
|
*
|
|
* @param conn a Strophe connection object
|
|
*/
|
|
void handler_system_delete_all(xmpp_conn_t *conn)
|
|
{
|
|
xmpp_handlist_t *item, *next, *head, *head_old;
|
|
hash_iterator_t *iter;
|
|
const char *key;
|
|
char *key2 = NULL;
|
|
|
|
/* TODO unify all kinds of handlers and avoid copy-paste below */
|
|
|
|
item = conn->handlers;
|
|
while (item) {
|
|
if (!item->user_handler) {
|
|
next = item->next;
|
|
_handler_item_remove(&conn->handlers, item);
|
|
if (item->ns) xmpp_free(conn->ctx, item->ns);
|
|
if (item->name) xmpp_free(conn->ctx, item->name);
|
|
if (item->type) xmpp_free(conn->ctx, item->type);
|
|
xmpp_free(conn->ctx, item);
|
|
item = next;
|
|
} else
|
|
item = item->next;
|
|
}
|
|
|
|
item = conn->timed_handlers;
|
|
while (item) {
|
|
if (!item->user_handler) {
|
|
next = item->next;
|
|
_handler_item_remove(&conn->timed_handlers, item);
|
|
xmpp_free(conn->ctx, item);
|
|
item = next;
|
|
} else
|
|
item = item->next;
|
|
}
|
|
|
|
iter = hash_iter_new(conn->id_handlers);
|
|
key = iter == NULL ? NULL : hash_iter_next(iter);
|
|
while (key != NULL) {
|
|
head = head_old = (xmpp_handlist_t *)hash_get(conn->id_handlers, key);
|
|
item = head;
|
|
while (item) {
|
|
if (!item->user_handler) {
|
|
next = item->next;
|
|
_handler_item_remove(&head, item);
|
|
xmpp_free(conn->ctx, item->id);
|
|
xmpp_free(conn->ctx, item);
|
|
item = next;
|
|
} else
|
|
item = item->next;
|
|
}
|
|
if (head != head_old)
|
|
key2 = xmpp_strdup(conn->ctx, key);
|
|
/* Hash table implementation is not perfect, so we need to find next
|
|
key before dropping current one. Otherwise, we will get access to
|
|
freed memory. */
|
|
key = hash_iter_next(iter);
|
|
if (head != head_old) {
|
|
/* hash_add() replaces value if the key exists */
|
|
if (head != NULL)
|
|
hash_add(conn->id_handlers, key2, head);
|
|
else
|
|
hash_drop(conn->id_handlers, key2);
|
|
xmpp_free(conn->ctx, key2);
|
|
}
|
|
}
|
|
if (iter) hash_iter_release(iter);
|
|
}
|