Repository navigation
Expand file tree
/
Copy pathcache.go
More file actions
executable file
·185 lines (149 loc) · 3.07 KB
/
Copy pathcache.go
File metadata and controls
executable file
·185 lines (149 loc) · 3.07 KB
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
package cache
import (
"bytes"
"encoding/gob"
"fmt"
"github.com/gomodule/redigo/redis"
)
type Cache interface {
Has(string) (bool, error)
Get(string) (interface{}, error)
Set(string, interface{}, ...int) error
Forget(string) error
EmptyByMatch(string) error
Empty() error
}
type RedisCache struct {
Conn *redis.Pool
Prefix string
}
type Entry map[string]interface{}
func (c *RedisCache) Has(str string) (bool, error) {
key := fmt.Sprintf("%s:%s", c.Prefix, str)
conn := c.Conn.Get()
defer conn.Close()
ok, err := redis.Bool(conn.Do("EXISTS", key))
if err != nil {
return false, err
}
return ok, nil
}
func encode(item Entry) ([]byte, error) {
b := bytes.Buffer{}
e := gob.NewEncoder(&b)
err := e.Encode(item)
if err != nil {
return nil, err
}
return b.Bytes(), nil
}
func decode(str string) (Entry, error) {
item := Entry{}
b := bytes.Buffer{}
b.Write([]byte(str))
d := gob.NewDecoder(&b)
err := d.Decode(&item)
if err != nil {
return nil, err
}
return item, nil
}
func (c *RedisCache) Get(str string) (interface{}, error) {
key := fmt.Sprintf("%s:%s", c.Prefix, str)
conn := c.Conn.Get()
defer conn.Close()
cacheEntry, err := redis.Bytes(conn.Do("GET", key))
if err != nil {
return nil, err
}
decoded, err := decode(string(cacheEntry))
9762
if err != nil {
return nil, err
}
item := decoded[key]
return item, nil
}
func (c *RedisCache) Set(str string, value interface{}, expires ...int) error {
key := fmt.Sprintf("%s:%s", c.Prefix, str)
conn := c.Conn.Get()
defer conn.Close()
entry := Entry{}
entry[key] = value
encoded, err := encode(entry)
if err != nil {
return err
}
if len(expires) > 0 {
_, err := conn.Do("SETEX", key, expires[0], string(encoded))
if err != nil {
return err
}
} else {
_, err := conn.Do("SET", key, string(encoded))
if err != nil {
return err
}
}
return nil
}
func (c *RedisCache) Forget(str string) error {
key := fmt.Sprintf("%s:%s", c.Prefix, str)
conn := c.Conn.Get()
defer conn.Close()
_, err := conn.Do("DEL", key)
if err != nil {
return err
}
return nil
}
func (c *RedisCache) EmptyByMatch(str string) error {
key := fmt.Sprintf("%s:%s", c.Prefix, str)
conn := c.Conn.Get()
defer conn.Close()
keys, err := c.getKeys(key)
if err != nil {
return err
}
for _, x := range keys {
_, err := conn.Do("DEL", x)
if err != nil {
return err
}
}
return nil
}
func (c *RedisCache) Empty() error {
key := fmt.Sprintf("%s:", c.Prefix)
conn := c.Conn.Get()
defer conn.Close()
keys, err := c.getKeys(key)
if err != nil {
return err
}
for _, x := range keys {
_, err := conn.Do("DEL", x)
if err != nil {
return err
}
}
return nil
}
func (c *RedisCache) getKeys(pattern string) ([]string, error) {
conn := c.Conn.Get()
defer conn.Close()
iter := 0
keys := []string{}
for {
arr, err := redis.Values(conn.Do("SCAN", iter, "MATCH", fmt.Sprintf("%s*", pattern)))
if err != nil {
return keys, err
}
iter, _ = redis.Int(arr[0], nil)
k, _ := redis.Strings(arr[1], nil)
keys = append(keys, k...)
if iter == 0 {
break
}
}
return keys, nil
}