/
provider.go
109 lines (95 loc) · 2.83 KB
/
provider.go
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// Copyright 2018 Google LLC. All Rights Reserved.
//
// 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 mysql
import (
"database/sql"
"flag"
"sync"
"github.com/golang/glog"
"github.com/google/trillian/monitoring"
"github.com/google/trillian/storage"
// Load MySQL driver
_ "github.com/go-sql-driver/mysql"
)
var (
mySQLURI = flag.String("mysql_uri", "test:zaphod@tcp(127.0.0.1:3306)/test", "Connection URI for MySQL database")
maxConns = flag.Int("mysql_max_conns", 0, "Maximum connections to the database")
maxIdle = flag.Int("mysql_max_idle_conns", -1, "Maximum idle database connections in the connection pool")
mysqlMu sync.Mutex
mysqlErr error
mysqlDB *sql.DB
mysqlStorageInstance *mysqlProvider
)
// GetDatabase returns an instance of MySQL database, or creates one.
//
// TODO(pavelkalinnikov): Make the dependency of MySQL quota provider from
// MySQL storage provider explicit.
func GetDatabase() (*sql.DB, error) {
mysqlMu.Lock()
defer mysqlMu.Unlock()
return getMySQLDatabaseLocked()
}
func init() {
if err := storage.RegisterProvider("mysql", newMySQLStorageProvider); err != nil {
glog.Fatalf("Failed to register storage provider mysql: %v", err)
}
}
type mysqlProvider struct {
db *sql.DB
mf monitoring.MetricFactory
}
func newMySQLStorageProvider(mf monitoring.MetricFactory) (storage.Provider, error) {
mysqlMu.Lock()
defer mysqlMu.Unlock()
if mysqlStorageInstance == nil {
db, err := getMySQLDatabaseLocked()
if err != nil {
return nil, err
}
mysqlStorageInstance = &mysqlProvider{
db: db,
mf: mf,
}
}
return mysqlStorageInstance, nil
}
// getMySQLDatabaseLocked returns an instance of MySQL database, or creates
// one. Requires mysqlMu to be locked.
func getMySQLDatabaseLocked() (*sql.DB, error) {
if mysqlDB != nil || mysqlErr != nil {
return mysqlDB, mysqlErr
}
db, err := OpenDB(*mySQLURI)
if err != nil {
mysqlErr = err
return nil, err
}
if *maxConns > 0 {
db.SetMaxOpenConns(*maxConns)
}
if *maxIdle >= 0 {
db.SetMaxIdleConns(*maxIdle)
}
mysqlDB, mysqlErr = db, nil
return db, nil
}
func (s *mysqlProvider) LogStorage() storage.LogStorage {
return NewLogStorage(s.db, s.mf)
}
func (s *mysqlProvider) AdminStorage() storage.AdminStorage {
return NewAdminStorage(s.db)
}
func (s *mysqlProvider) Close() error {
return s.db.Close()
}