summaryrefslogtreecommitdiff
path: root/adapters/libsdevent.h
blob: 1268ed9f974f8eb8a5351c4cb64c0c6af62a3730 (plain)
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
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
#ifndef HIREDIS_LIBSDEVENT_H
#define HIREDIS_LIBSDEVENT_H
#include <systemd/sd-event.h>
#include "../hiredis.h"
#include "../async.h"

#define REDIS_LIBSDEVENT_DELETED 0x01
#define REDIS_LIBSDEVENT_ENTERED 0x02

typedef struct redisLibsdeventEvents {
    redisAsyncContext *context;
    struct sd_event *event;
    struct sd_event_source *fdSource;
    struct sd_event_source *timerSource;
    int fd;
    short flags;
    short state;
} redisLibsdeventEvents;

static void redisLibsdeventDestroy(redisLibsdeventEvents *e) {
    if (e->fdSource) {
        e->fdSource = sd_event_source_disable_unref(e->fdSource);
    }
    if (e->timerSource) {
        e->timerSource = sd_event_source_disable_unref(e->timerSource);
    }
    sd_event_unref(e->event);
    hi_free(e);
}

static int redisLibsdeventTimeoutHandler(sd_event_source *s, uint64_t usec, void *userdata) {
    ((void)s);
    ((void)usec);
    redisLibsdeventEvents *e = (redisLibsdeventEvents*)userdata;
    redisAsyncHandleTimeout(e->context);
    return 0;
}

static int redisLibsdeventHandler(sd_event_source *s, int fd, uint32_t event, void *userdata) {
    ((void)s);
    ((void)fd);
    redisLibsdeventEvents *e = (redisLibsdeventEvents*)userdata;
    e->state |= REDIS_LIBSDEVENT_ENTERED;

#define CHECK_DELETED() if (e->state & REDIS_LIBSDEVENT_DELETED) {\
        redisLibsdeventDestroy(e);\
        return 0; \
    }

    if ((event & EPOLLIN) && e->context && (e->state & REDIS_LIBSDEVENT_DELETED) == 0) {
        redisAsyncHandleRead(e->context);
        CHECK_DELETED();
    }

    if ((event & EPOLLOUT) && e->context && (e->state & REDIS_LIBSDEVENT_DELETED) == 0) {
        redisAsyncHandleWrite(e->context);
        CHECK_DELETED();
    }

    e->state &= ~REDIS_LIBSDEVENT_ENTERED;
#undef CHECK_DELETED

    return 0;
}

static void redisLibsdeventAddRead(void *userdata) {
    redisLibsdeventEvents *e = (redisLibsdeventEvents*)userdata;

    if (e->flags & EPOLLIN) {
        return;
    }

    e->flags |= EPOLLIN;

    if (e->flags & EPOLLOUT) {
        sd_event_source_set_io_events(e->fdSource, e->flags);
    } else {
        sd_event_add_io(e->event, &e->fdSource, e->fd, e->flags, redisLibsdeventHandler, e);
    }
}

static void redisLibsdeventDelRead(void *userdata) {
    redisLibsdeventEvents *e = (redisLibsdeventEvents*)userdata;

    e->flags &= ~EPOLLIN;

    if (e->flags) {
        sd_event_source_set_io_events(e->fdSource, e->flags);
    } else {
        e->fdSource = sd_event_source_disable_unref(e->fdSource);
    }
}

static void redisLibsdeventAddWrite(void *userdata) {
    redisLibsdeventEvents *e = (redisLibsdeventEvents*)userdata;

    if (e->flags & EPOLLOUT) {
        return;
    }

    e->flags |= EPOLLOUT;

    if (e->flags & EPOLLIN) {
        sd_event_source_set_io_events(e->fdSource, e->flags);
    } else {
        sd_event_add_io(e->event, &e->fdSource, e->fd, e->flags, redisLibsdeventHandler, e);
    }
}

static void redisLibsdeventDelWrite(void *userdata) {
    redisLibsdeventEvents *e = (redisLibsdeventEvents*)userdata;

    e->flags &= ~EPOLLOUT;

    if (e->flags) {
        sd_event_source_set_io_events(e->fdSource, e->flags);
    } else {
        e->fdSource = sd_event_source_disable_unref(e->fdSource);
    }
}

static void redisLibsdeventCleanup(void *userdata) {
    redisLibsdeventEvents *e = (redisLibsdeventEvents*)userdata;

    if (!e) {
        return;
    }

    if (e->state & REDIS_LIBSDEVENT_ENTERED) {
        e->state |= REDIS_LIBSDEVENT_DELETED;
    } else {
        redisLibsdeventDestroy(e);
    }
}

static void redisLibsdeventSetTimeout(void *userdata, struct timeval tv) {
    redisLibsdeventEvents *e = (redisLibsdeventEvents *)userdata;

    uint64_t usec = tv.tv_sec * 1000000 + tv.tv_usec;
    if (!e->timerSource) {
        sd_event_add_time_relative(e->event, &e->timerSource, CLOCK_MONOTONIC, usec, 1, redisLibsdeventTimeoutHandler, e);
    } else {
        sd_event_source_set_time_relative(e->timerSource, usec);
    }
}

static int redisLibsdeventAttach(redisAsyncContext *ac, struct sd_event *event) {
    redisContext *c = &(ac->c);
    redisLibsdeventEvents *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 = (redisLibsdeventEvents*)hi_calloc(1, sizeof(*e));
    if (e == NULL)
        return REDIS_ERR;

    /* Initialize and increase event refcount */
    e->context = ac;
    e->event = event;
    e->fd = c->fd;
    sd_event_ref(event);

    /* Register functions to start/stop listening for events */
    ac->ev.addRead = redisLibsdeventAddRead;
    ac->ev.delRead = redisLibsdeventDelRead;
    ac->ev.addWrite = redisLibsdeventAddWrite;
    ac->ev.delWrite = redisLibsdeventDelWrite;
    ac->ev.cleanup = redisLibsdeventCleanup;
    ac->ev.scheduleTimer = redisLibsdeventSetTimeout;
    ac->ev.data = e;

    return REDIS_OK;
}
#endif