/
redis_database.go
222 lines (186 loc) · 4.41 KB
/
redis_database.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
210
211
212
213
214
215
216
217
218
219
220
221
222
// Copyright 2016 IBM Corporation
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package database
import (
"time"
log "github.com/Sirupsen/logrus"
"github.com/garyburd/redigo/redis"
"github.com/amalgam8/amalgam8/registry/utils/logging"
)
type redisDB struct {
conn redis.Conn
pool *redis.Pool
logger *log.Entry
address string
password string
}
// NewRedisDB returns an instance of a Redis database
func NewRedisDB(address string, password string) Database {
return NewRedisDBWithConn(nil, address, password)
}
// NewRedisDBWithConn returns an instance of a Redis database using an existing connection
func NewRedisDBWithConn(conn redis.Conn, address string, password string) Database {
db := &redisDB{
conn: conn,
pool: nil,
address: address,
password: password,
logger: logging.GetLogger(module),
}
return db
}
// NewRedisDBWithPool returns an instance of a Redis database using an existing connection pool
func NewRedisDBWithPool(pool *redis.Pool) Database {
db := &redisDB{
conn: nil,
pool: pool,
address: "",
password: "",
logger: logging.GetLogger(module),
}
return db
}
func (rdb *redisDB) connect() (redis.Conn, error) {
var conn redis.Conn
var err error
if rdb.pool == nil {
// Connect to Redis
conn, err = redis.Dial("tcp", rdb.address)
if err != nil {
return nil, err
}
_, err = conn.Do("AUTH", rdb.password)
if err != nil {
conn.Close()
return nil, err
}
} else {
conn = rdb.pool.Get()
}
return conn, nil
}
func (rdb *redisDB) ReadKeys(match string) ([]string, error) {
var err error
conn := rdb.conn
if rdb.conn == nil {
conn, err = rdb.connect()
if err != nil {
return nil, err
}
defer conn.Close()
}
matches, err := rdb.scan(conn, match)
return matches, err
}
func (rdb *redisDB) ReadEntry(key string) ([]byte, error) {
var err error
conn := rdb.conn
if rdb.conn == nil {
conn, err = rdb.connect()
if err != nil {
return nil, err
}
defer conn.Close()
}
value, err := conn.Do("GET", key)
if value == nil || err != nil {
return nil, err
}
return redis.Bytes(value, err)
}
func (rdb *redisDB) ReadAllEntries(match string) (map[string]string, error) {
var err error
conn := rdb.conn
if rdb.conn == nil {
conn, err = rdb.connect()
if err != nil {
return nil, err
}
defer conn.Close()
}
entries := make(map[string]string)
matches, err := rdb.scan(conn, match)
var args []interface{}
for _, k := range matches {
args = append(args, k)
}
values, err := redis.Strings(conn.Do("MGET", args...))
if err != nil {
return nil, err
}
for i, value := range values {
entries[matches[i]] = value
}
return entries, nil
}
func (rdb *redisDB) InsertEntry(key string, entry []byte) error {
var err error
conn := rdb.conn
if rdb.conn == nil {
conn, err = rdb.connect()
if err != nil {
return err
}
defer conn.Close()
}
_, err = conn.Do("SET", key, entry)
return err
}
func (rdb *redisDB) DeleteEntry(key string) (int, error) {
var err error
conn := rdb.conn
if rdb.conn == nil {
conn, err = rdb.connect()
if err != nil {
return 0, err
}
defer conn.Close()
}
return redis.Int(conn.Do("DEL", key))
}
func (rdb *redisDB) Expire(key string, ttl time.Duration) error {
var err error
conn := rdb.conn
if rdb.conn == nil {
conn, err = rdb.connect()
if err != nil {
return err
}
defer conn.Close()
}
_, err = conn.Do("EXPIRE", key, ttl.Seconds())
return err
}
func (rdb *redisDB) scan(conn redis.Conn, match string) ([]string, error) {
var (
cursor int64
keys []string
)
var matches []string
for {
items, err := redis.Values(conn.Do("SCAN", cursor, "MATCH", match))
if err != nil || items == nil || len(items) == 0 {
return matches, err
}
items, err = redis.Scan(items, &cursor, &keys)
if err != nil {
return matches, err
}
matches = append(matches, keys...)
if cursor == 0 {
break
}
}
return matches, nil
}