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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-14 13:40:54 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-14 13:40:54 +0000
commit317c0644ccf108aa23ef3fd8358bd66c2840bfc0 (patch)
treec417b3d25c86b775989cb5ac042f37611b626c8a /deps/hiredis/adapters/libevent.h
parentInitial commit. (diff)
downloadredis-317c0644ccf108aa23ef3fd8358bd66c2840bfc0.tar.xz
redis-317c0644ccf108aa23ef3fd8358bd66c2840bfc0.zip
Adding upstream version 5:7.2.4.upstream/5%7.2.4
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'deps/hiredis/adapters/libevent.h')
-rw-r--r--deps/hiredis/adapters/libevent.h175
1 files changed, 175 insertions, 0 deletions
diff --git a/deps/hiredis/adapters/libevent.h b/deps/hiredis/adapters/libevent.h
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+/*
+ * Copyright (c) 2010-2011, Pieter Noordhuis <pcnoordhuis at gmail dot com>
+ *
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * * Redistributions of source code must retain the above copyright notice,
+ * this list of conditions and the following disclaimer.
+ * * Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ * * Neither the name of Redis nor the names of its contributors may be used
+ * to endorse or promote products derived from this software without
+ * specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef __HIREDIS_LIBEVENT_H__
+#define __HIREDIS_LIBEVENT_H__
+#include <event2/event.h>
+#include "../hiredis.h"
+#include "../async.h"
+
+#define REDIS_LIBEVENT_DELETED 0x01
+#define REDIS_LIBEVENT_ENTERED 0x02
+
+typedef struct redisLibeventEvents {
+ redisAsyncContext *context;
+ struct event *ev;
+ struct event_base *base;
+ struct timeval tv;
+ short flags;
+ short state;
+} redisLibeventEvents;
+
+static void redisLibeventDestroy(redisLibeventEvents *e) {
+ hi_free(e);
+}
+
+static void redisLibeventHandler(evutil_socket_t fd, short event, void *arg) {
+ ((void)fd);
+ redisLibeventEvents *e = (redisLibeventEvents*)arg;
+ e->state |= REDIS_LIBEVENT_ENTERED;
+
+ #define CHECK_DELETED() if (e->state & REDIS_LIBEVENT_DELETED) {\
+ redisLibeventDestroy(e);\
+ return; \
+ }
+
+ if ((event & EV_TIMEOUT) && (e->state & REDIS_LIBEVENT_DELETED) == 0) {
+ redisAsyncHandleTimeout(e->context);
+ CHECK_DELETED();
+ }
+
+ if ((event & EV_READ) && e->context && (e->state & REDIS_LIBEVENT_DELETED) == 0) {
+ redisAsyncHandleRead(e->context);
+ CHECK_DELETED();
+ }
+
+ if ((event & EV_WRITE) && e->context && (e->state & REDIS_LIBEVENT_DELETED) == 0) {
+ redisAsyncHandleWrite(e->context);
+ CHECK_DELETED();
+ }
+
+ e->state &= ~REDIS_LIBEVENT_ENTERED;
+ #undef CHECK_DELETED
+}
+
+static void redisLibeventUpdate(void *privdata, short flag, int isRemove) {
+ redisLibeventEvents *e = (redisLibeventEvents *)privdata;
+ const struct timeval *tv = e->tv.tv_sec || e->tv.tv_usec ? &e->tv : NULL;
+
+ if (isRemove) {
+ if ((e->flags & flag) == 0) {
+ return;
+ } else {
+ e->flags &= ~flag;
+ }
+ } else {
+ if (e->flags & flag) {
+ return;
+ } else {
+ e->flags |= flag;
+ }
+ }
+
+ event_del(e->ev);
+ event_assign(e->ev, e->base, e->context->c.fd, e->flags | EV_PERSIST,
+ redisLibeventHandler, privdata);
+ event_add(e->ev, tv);
+}
+
+static void redisLibeventAddRead(void *privdata) {
+ redisLibeventUpdate(privdata, EV_READ, 0);
+}
+
+static void redisLibeventDelRead(void *privdata) {
+ redisLibeventUpdate(privdata, EV_READ, 1);
+}
+
+static void redisLibeventAddWrite(void *privdata) {
+ redisLibeventUpdate(privdata, EV_WRITE, 0);
+}
+
+static void redisLibeventDelWrite(void *privdata) {
+ redisLibeventUpdate(privdata, EV_WRITE, 1);
+}
+
+static void redisLibeventCleanup(void *privdata) {
+ redisLibeventEvents *e = (redisLibeventEvents*)privdata;
+ if (!e) {
+ return;
+ }
+ event_del(e->ev);
+ event_free(e->ev);
+ e->ev = NULL;
+
+ if (e->state & REDIS_LIBEVENT_ENTERED) {
+ e->state |= REDIS_LIBEVENT_DELETED;
+ } else {
+ redisLibeventDestroy(e);
+ }
+}
+
+static void redisLibeventSetTimeout(void *privdata, struct timeval tv) {
+ redisLibeventEvents *e = (redisLibeventEvents *)privdata;
+ short flags = e->flags;
+ e->flags = 0;
+ e->tv = tv;
+ redisLibeventUpdate(e, flags, 0);
+}
+
+static int redisLibeventAttach(redisAsyncContext *ac, struct event_base *base) {
+ redisContext *c = &(ac->c);
+ redisLibeventEvents *e;
+
+ /* Nothing should be attached when something is already attached */
+ if (ac->ev.data != NULL)
+ return REDIS_ERR;
+
+ /* Create container for context and r/w events */
+ e = (redisLibeventEvents*)hi_calloc(1, sizeof(*e));
+ if (e == NULL)
+ return REDIS_ERR;
+
+ e->context = ac;
+
+ /* Register functions to start/stop listening for events */
+ ac->ev.addRead = redisLibeventAddRead;
+ ac->ev.delRead = redisLibeventDelRead;
+ ac->ev.addWrite = redisLibeventAddWrite;
+ ac->ev.delWrite = redisLibeventDelWrite;
+ ac->ev.cleanup = redisLibeventCleanup;
+ ac->ev.scheduleTimer = redisLibeventSetTimeout;
+ ac->ev.data = e;
+
+ /* Initialize and install read/write events */
+ e->ev = event_new(base, c->fd, EV_READ | EV_WRITE, redisLibeventHandler, e);
+ e->base = base;
+ return REDIS_OK;
+}
+#endif