-
Notifications
You must be signed in to change notification settings - Fork 0
/
rowbuffer.go
198 lines (174 loc) · 3.94 KB
/
rowbuffer.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
package rowbuffer
import (
"database/sql"
_ "github.com/mattn/go-sqlite3"
redis "gopkg.in/redis.v3"
// "log"
"strconv"
"strings"
)
type RowBuffer struct {
redisConn *redis.Client
sqliteConn *sql.DB
tableName string
colsName []string
query string
flushBuffer []interface{}
}
func _err(err error) {
if err != nil {
panic(err)
}
}
func ifToStr(i interface{}) string {
var t string
switch i.(type) {
case string:
t = i.(string)
default:
t = strconv.Itoa(i.(int))
}
return t
}
func strsToIfs(s []string) []interface{} {
vals := make([]interface{}, len(s))
for i, v := range s {
vals[i] = v
}
return vals
}
func (bf *RowBuffer) get(id interface{}) []string { // id int
vals, _ := bf.redisConn.HVals(bf.tableName + "-" + ifToStr(id)).Result()
if len(vals) == 0 {
return bf.fetchFromSql(id)
}
return vals
}
func (bf *RowBuffer) fetchFromSql(id interface{}) []string {
vals := make([]sql.RawBytes, len(bf.colsName))
scanArgs := make([]interface{}, len(vals))
for i := range vals {
scanArgs[i] = &vals[i]
}
var (
rows *sql.Rows
e error
)
switch id.(type) {
case string:
rows, e = bf.sqliteConn.Query(bf.query)
default:
rows, e = bf.sqliteConn.Query(bf.query, id.(int))
}
_err(e)
var ret []string
for rows.Next() {
rows.Scan(scanArgs...)
ret = bf.setRedis(id, vals)
}
return ret
}
func (bf *RowBuffer) setRedis(key interface{}, vals []sql.RawBytes) []string {
var (
k1 = bf.colsName[0]
v1 = string(vals[0])
kv = make([]string, (len(bf.colsName)-1)*2)
ret = make([]string, len(bf.colsName))
)
ret[0] = v1
for i, v := range vals[1:] {
kv[i*2] = bf.colsName[i+1]
kv[i*2+1] = string(v)
ret[i+1] = string(v)
}
bf.redisConn.HMSet(bf.tableName+"-"+ifToStr(key), k1, v1, kv...)
return ret
}
func (bf *RowBuffer) set(key interface{}, cols []string, vals []interface{}) {
var kv []string
for i := 1; i < len(cols); i++ {
kv = append(kv, cols[i], ifToStr(vals[i]))
}
bf.redisConn.HMSet(bf.tableName+"-"+ifToStr(key), cols[0], ifToStr(vals[0]), kv...)
for _, v := range bf.flushBuffer {
if v == key {
return
}
}
bf.flushBuffer = append(bf.flushBuffer, key)
if len(bf.flushBuffer) >= 10 {
bf.flush()
}
}
func (bf *RowBuffer) close() {
bf.flush()
bf.redisConn.Close()
bf.sqliteConn.Close()
}
func (bf *RowBuffer) flush() {
for _, key := range bf.flushBuffer {
bf.flushBuffer = bf.flushBuffer[1:]
vals, e := bf.redisConn.HVals(bf.tableName + "-" + ifToStr(key)).Result()
_err(e)
if len(vals) == 0 {
continue
}
bf.updateSql(key, bf.colsName, strsToIfs(vals))
}
}
func (bf *RowBuffer) updateSql(key interface{}, cols []string, vals []interface{}) {
sql := "update " + bf.tableName + " set "
for i, v := range cols {
cols[i] = v + " = ?"
}
sql += strings.Join(cols, ", ")
switch key.(type) {
case int:
sql += " where id = ?"
vals = append(vals, key)
}
_, e := bf.sqliteConn.Exec(sql, vals...)
_err(e)
}
func (bf *RowBuffer) clearBuffer(key interface{}) {
bf.redisConn.Expire(bf.tableName+"-"+ifToStr(key), 0)
}
func getRedisConn(addr string, password string, db int64) *redis.Client {
// addr: "127.0.0.1:6379"
// password: ""
// db: 0
client := redis.NewClient(&redis.Options{
Addr: addr,
Password: password,
DB: db,
})
_, err := client.Ping().Result()
_err(err)
return client
}
func getSqliteConn(db string) *sql.DB {
conn, err := sql.Open("sqlite3", db)
_err(err)
return conn
}
func genRowBuffer(r *redis.Client, s *sql.DB, tbName string, colsName []string, query string) *RowBuffer {
var flushBuffer []interface{}
return &RowBuffer{r, s, tbName, colsName, query, flushBuffer}
}
/*
func main() {
bf := genRowBuffer(
getRedisConn("127.0.0.1:6379", "", 0),
getSqliteConn("./middle.db"),
"test",
[]string{"id", "name", "genre", "career"},
"select * from test where id = ?",
)
bf.clearBuffer(1)
log.Println(bf.get(1))
bf.set(1, []string{"name", "genre"}, []interface{}{"Lily", 0})
log.Println(bf.get(1))
// bf.flush()
bf.close()
}
*/