1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
|
/*
* 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"
typedef struct redisLibeventEvents {
redisAsyncContext *context;
struct event *ev, *tmr;
struct event_base *base;
struct timeval tv;
short flags;
} redisLibeventEvents;
static void redisLibeventHandler(int fd, short event, void *arg) {
((void)fd);
redisLibeventEvents *e = (redisLibeventEvents*)arg;
if (event & EV_TIMEOUT) {
redisAsyncHandleTimeout(e->context);
}
if (e->context && (event & EV_READ)) {
redisAsyncHandleRead(e->context);
}
if (e->context && (event & EV_WRITE)) {
redisAsyncHandleWrite(e->context);
}
}
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,
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;
event_free(e->ev);
free(e);
}
static void redisLibeventSetTimeout(void *privdata, struct timeval tv) {
redisLibeventEvents *e = (redisLibeventEvents *)privdata;
short flags = e->flags;
e->flags = 0;
e->tv = tv;
event_del(e->ev);
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*)malloc(sizeof(*e));
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->flags = 0;
e->base = base;
e->tv.tv_sec = 0;
e->tv.tv_usec = 0;
return REDIS_OK;
}
#endif
|
