forked from kataras/go-sessions
/
service.go
209 lines (179 loc) · 4.53 KB
/
service.go
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
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
package service
import (
"time"
"github.com/garyburd/redigo/redis"
"github.com/kataras/iris/core/errors"
)
var (
// ErrRedisClosed an error with message 'Redis is already closed'
ErrRedisClosed = errors.New("Redis is already closed")
// ErrKeyNotFound an error with message 'Key $thekey doesn't found'
ErrKeyNotFound = errors.New("Key '%s' doesn't found")
)
// Service the Redis service, contains the config and the redis pool
type Service struct {
// Connected is true when the Service has already connected
Connected bool
// Config the redis config for this redis
Config *Config
pool *redis.Pool
}
// PingPong sends a ping and receives a pong, if no pong received then returns false and filled error
func (r *Service) PingPong() (bool, error) {
c := r.pool.Get()
defer c.Close()
msg, err := c.Do("PING")
if err != nil || msg == nil {
return false, err
}
return (msg == "PONG"), nil
}
// CloseConnection closes the redis connection
func (r *Service) CloseConnection() error {
if r.pool != nil {
return r.pool.Close()
}
return ErrRedisClosed
}
// Set sets a key-value to the redis store.
// The expiration is setted by the MaxAgeSeconds.
func (r *Service) Set(key string, value interface{}, secondsLifetime int) (err error) {
c := r.pool.Get()
defer c.Close()
if c.Err() != nil {
return c.Err()
}
// if has expiration, then use the "EX" to delete the key automatically.
if secondsLifetime > 0 {
_, err = c.Do("SETEX", r.Config.Prefix+key, secondsLifetime, value)
} else {
_, err = c.Do("SET", r.Config.Prefix+key, value)
}
return
}
// Get returns value, err by its key
//returns nil and a filled error if something bad happened.
func (r *Service) Get(key string) (interface{}, error) {
c := r.pool.Get()
defer c.Close()
if err := c.Err(); err != nil {
return nil, err
}
redisVal, err := c.Do("GET", r.Config.Prefix+key)
if err != nil {
return nil, err
}
if redisVal == nil {
return nil, ErrKeyNotFound.Format(key)
}
return redisVal, nil
}
// GetAll returns all redis entries using the "SCAN" command (2.8+).
func (r *Service) GetAll() (interface{}, error) {
c := r.pool.Get()
defer c.Close()
if err := c.Err(); err != nil {
return nil, err
}
redisVal, err := c.Do("SCAN", 0) // 0 -> cursor
if err != nil {
return nil, err
}
if redisVal == nil {
return nil, err
}
return redisVal, nil
}
// GetBytes returns value, err by its key
// you can use utils.Deserialize((.GetBytes("yourkey"),&theobject{})
//returns nil and a filled error if something wrong happens
func (r *Service) GetBytes(key string) ([]byte, error) {
c := r.pool.Get()
defer c.Close()
if err := c.Err(); err != nil {
return nil, err
}
redisVal, err := c.Do("GET", r.Config.Prefix+key)
if err != nil {
return nil, err
}
if redisVal == nil {
return nil, ErrKeyNotFound.Format(key)
}
return redis.Bytes(redisVal, err)
}
// Delete removes redis entry by specific key
func (r *Service) Delete(key string) error {
c := r.pool.Get()
defer c.Close()
if _, err := c.Do("DEL", r.Config.Prefix+key); err != nil {
return err
}
return nil
}
func dial(network string, addr string, pass string) (redis.Conn, error) {
if network == "" {
network = DefaultRedisNetwork
}
if addr == "" {
addr = DefaultRedisAddr
}
c, err := redis.Dial(network, addr)
if err != nil {
return nil, err
}
if pass != "" {
if _, err = c.Do("AUTH", pass); err != nil {
c.Close()
return nil, err
}
}
return c, err
}
// Connect connects to the redis, called only once
func (r *Service) Connect() {
c := r.Config
if c.IdleTimeout <= 0 {
c.IdleTimeout = DefaultRedisIdleTimeout
}
if c.Network == "" {
c.Network = DefaultRedisNetwork
}
if c.Addr == "" {
c.Addr = DefaultRedisAddr
}
pool := &redis.Pool{IdleTimeout: DefaultRedisIdleTimeout, MaxIdle: c.MaxIdle, MaxActive: c.MaxActive}
pool.TestOnBorrow = func(c redis.Conn, t time.Time) error {
_, err := c.Do("PING")
return err
}
if c.Database != "" {
pool.Dial = func() (redis.Conn, error) {
red, err := dial(c.Network, c.Addr, c.Password)
if err != nil {
return nil, err
}
if _, err = red.Do("SELECT", c.Database); err != nil {
red.Close()
return nil, err
}
return red, err
}
} else {
pool.Dial = func() (redis.Conn, error) {
return dial(c.Network, c.Addr, c.Password)
}
}
r.Connected = true
r.pool = pool
}
// New returns a Redis service filled by the passed config
// to connect call the .Connect().
func New(cfg ...Config) *Service {
c := DefaultConfig()
if len(cfg) > 0 {
c = cfg[0]
}
r := &Service{pool: &redis.Pool{}, Config: &c}
return r
}