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gorm.go
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gorm.go
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// Copyright 2017 AMIS Technologies
//
// 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 gorm
import (
"fmt"
"time"
"github.com/jinzhu/gorm"
"github.com/getamis/sirius/database"
"github.com/getamis/sirius/database/mysql"
)
const (
// retryDelay is the delay time for each retrying
retryDelay = 1 * time.Second
// retryTimeout is the timeout for retry process
retryTimeout = 10 * time.Second
)
// New creates a GORM database wrapper
func New(driver string, opts ...database.Option) (db *gorm.DB, err error) {
o := &database.Options{
RetryDelay: retryDelay,
RetryTimeout: retryTimeout,
}
for _, opt := range opts {
opt(o)
}
if o.RetryDelay == 0 {
o.RetryDelay = retryDelay
}
if o.RetryTimeout == 0 {
o.RetryTimeout = retryTimeout
}
var connectionString string
switch driver {
case "mysql":
connectionString, err = mysql.ToConnectionString(o.DriverOptions...)
default:
return nil, fmt.Errorf("unsupported driver '%s'", driver)
}
if err != nil {
return nil, err
}
return connectToDatabase(driver, connectionString, o)
}
func connectToDatabase(driver, connectionString string, o *database.Options) (*gorm.DB, error) {
var gormDB *gorm.DB
var lastErr error
getDB := func() (*gorm.DB, error) {
db, err := gorm.Open(driver, connectionString)
if err != nil {
return nil, err
}
if err := db.DB().Ping(); err != nil {
return nil, err
}
if o.MaxIdleConns > 0 {
db.DB().SetMaxIdleConns(o.MaxIdleConns)
}
if o.MaxOpenConns > 0 {
db.DB().SetMaxOpenConns(o.MaxOpenConns)
}
if o.ConnMaxLifetime > 0 {
db.DB().SetConnMaxLifetime(o.ConnMaxLifetime)
}
db.LogMode(o.Logging)
db.SetLogger(&logger{
logger: o.Logger,
})
if o.TableName != "" {
db = db.Table(o.TableName)
}
return db, nil
}
gormDB, lastErr = getDB()
if lastErr == nil {
return gormDB, nil
}
// retry
timer := time.NewTimer(o.RetryTimeout)
defer timer.Stop()
ticker := time.NewTicker(o.RetryDelay)
defer ticker.Stop()
for {
select {
case <-timer.C:
if o.Logger != nil {
o.Logger.Error("Connecting to database timeout", "err", lastErr)
}
return nil, lastErr
case <-ticker.C:
gormDB, lastErr = getDB()
if o.Logger != nil {
o.Logger.Warn("Failed to connect to database, retry...", "err", lastErr)
}
if lastErr == nil {
return gormDB, nil
}
}
}
}