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db.go
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db.go
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package bsql
import (
"database/sql"
"errors"
"fmt"
"math/rand"
)
var (
defaultPool dbPoolType
ErrNoDatabaseRegistered = errors.New("no db registered")
ErrDriverNameNotMatch = errors.New("driver name not match")
)
type dbPoolType struct {
driverName string
master []*sql.DB
}
func (dbPool *dbPoolType) registerMaster(driverName, connStr string) error {
db, err := sql.Open(driverName, connStr)
if err != nil {
return fmt.Errorf("err on open db connection: %w", err)
}
err = db.Ping()
if err != nil {
return fmt.Errorf("err on ping db: %w, %s", err, connStr)
}
if dbPool.driverName == "" {
dbPool.driverName = driverName
} else if dbPool.driverName != driverName {
return fmt.Errorf("%w: %s, %s", ErrDriverNameNotMatch, dbPool.driverName, driverName)
}
dbPool.master = append(dbPool.master, db)
return nil
}
func RegisterMaster(driverName, connStr string) error {
return defaultPool.registerMaster(driverName, connStr)
}
func (dbPool *dbPoolType) getMaster() (*sql.DB, error) {
if len(dbPool.master) == 0 {
return nil, ErrNoDatabaseRegistered
}
return dbPool.master[rand.Intn(len(dbPool.master))], nil
}
func GetMaster() (*sql.DB, error) {
return defaultPool.getMaster()
}