/
db.go
78 lines (63 loc) · 1.25 KB
/
db.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
package service
import (
"database/sql"
_ "github.com/go-sql-driver/mysql"
"log"
"sync"
"github.com/open-falcon/falcon-plus/modules/nodata/g"
)
const (
dbBaseConnName = "db.base"
)
var (
dbLock = sync.RWMutex{}
dbConnMap = make(map[string]*sql.DB)
)
func InitDB() {
_, err := GetDbConn(dbBaseConnName)
if err != nil {
log.Fatalln("config.InitDB error", err)
return // never go here
}
log.Println("config.InitDB ok")
}
func GetBaseConn() (c *sql.DB, e error) {
return GetDbConn(dbBaseConnName)
}
func GetDbConn(connName string) (c *sql.DB, e error) {
dbLock.Lock()
defer dbLock.Unlock()
var err error
var dbConn *sql.DB
dbConn = dbConnMap[connName]
if dbConn == nil {
dbConn, err = makeDbConn()
if err != nil {
closeDbConn(dbConn)
return nil, err
}
dbConnMap[connName] = dbConn
}
err = dbConn.Ping()
if err != nil {
closeDbConn(dbConn)
delete(dbConnMap, connName)
return nil, err
}
return dbConn, err
}
// internal
func makeDbConn() (conn *sql.DB, err error) {
conn, err = sql.Open("mysql", g.Config().Config.Dsn)
if err != nil {
return nil, err
}
conn.SetMaxIdleConns(int(g.Config().Config.MaxIdle))
err = conn.Ping()
return conn, err
}
func closeDbConn(conn *sql.DB) {
if conn != nil {
conn.Close()
}
}