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db: when DB is unreachable, retry 5 times before fatal return

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nemunaire 2018-01-17 17:05:08 +01:00 committed by nemunaire
parent 5b2dc909e2
commit 3932bba83d
1 changed files with 13 additions and 6 deletions
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19
libfic/db.go
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@ -2,7 +2,9 @@ package fic
import (
"database/sql"
"log"
"os"
"time"
_ "github.com/go-sql-driver/mysql"
)
@ -33,15 +35,20 @@ func DSNGenerator() string {
return db_user + ":" + db_password + "@" + db_host + "/" + db_db
}
func DBInit(dsn string) error {
var err error
func DBInit(dsn string) (err error) {
if db, err = sql.Open("mysql", dsn + "?parseTime=true&foreign_key_checks=1"); err != nil {
return err
return
}
if _, err := db.Exec(`SET SESSION sql_mode = 'STRICT_TRANS_TABLES,NO_ZERO_IN_DATE,NO_ZERO_DATE,ERROR_FOR_DIVISION_BY_ZERO,NO_AUTO_CREATE_USER,NO_ENGINE_SUBSTITUTION';`); err != nil {
return err
_, err = db.Exec(`SET SESSION sql_mode = 'STRICT_TRANS_TABLES,NO_ZERO_IN_DATE,NO_ZERO_DATE,ERROR_FOR_DIVISION_BY_ZERO,NO_AUTO_CREATE_USER,NO_ENGINE_SUBSTITUTION';`)
for i := 0; err != nil && i < 5; i += 1 {
if _, err = db.Exec(`SET SESSION sql_mode = 'STRICT_TRANS_TABLES,NO_ZERO_IN_DATE,NO_ZERO_DATE,ERROR_FOR_DIVISION_BY_ZERO,NO_AUTO_CREATE_USER,NO_ENGINE_SUBSTITUTION';`); err != nil && i <= 5 {
log.Println("An error occurs when trying to connect to DB, will retry in 2 seconds: ", err)
time.Sleep(2 * time.Second)
}
}
return nil
return
}
func DBCreate() error {