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connector.go
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/
connector.go
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/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You 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 sql
import (
"context"
"database/sql/driver"
"sync"
"github.com/go-sql-driver/mysql"
"github.com/seata/seata-go/pkg/datasource/sql/types"
)
type seataATConnector struct {
*seataConnector
transType types.TransactionMode
}
func (c *seataATConnector) Connect(ctx context.Context) (driver.Conn, error) {
conn, err := c.seataConnector.Connect(ctx)
if err != nil {
return nil, err
}
_conn, _ := conn.(*Conn)
return &ATConn{
Conn: _conn,
}, nil
}
func (c *seataATConnector) Driver() driver.Driver {
return &seataATDriver{
seataDriver: c.seataConnector.Driver().(*seataDriver),
}
}
type seataXAConnector struct {
*seataConnector
transType types.TransactionMode
}
func (c *seataXAConnector) Connect(ctx context.Context) (driver.Conn, error) {
conn, err := c.seataConnector.Connect(ctx)
if err != nil {
return nil, err
}
_conn, _ := conn.(*Conn)
return &XAConn{
Conn: _conn,
}, nil
}
func (c *seataXAConnector) Driver() driver.Driver {
return &seataXADriver{
seataDriver: c.seataConnector.Driver().(*seataDriver),
}
}
// A Connector represents a driver in a fixed configuration
// and can create any number of equivalent Conns for use
// by multiple goroutines.
//
// A Connector can be passed to sql.OpenDB, to allow drivers
// to implement their own sql.DB constructors, or returned by
// DriverContext's OpenConnector method, to allow drivers
// access to context and to avoid repeated parsing of driver
// configuration.
//
// If a Connector implements io.Closer, the sql package's DB.Close
// method will call Close and return error (if any).
type seataConnector struct {
transType types.TransactionMode
res *DBResource
once sync.Once
driver driver.Driver
target driver.Connector
cfg *mysql.Config
}
// Connect returns a connection to the database.
// Connect may return a cached connection (one previously
// closed), but doing so is unnecessary; the sql package
// maintains a pool of idle connections for efficient re-use.
//
// The provided context.Context is for dialing purposes only
// (see net.DialContext) and should not be stored or used for
// other purposes. A default timeout should still be used
// when dialing as a connection pool may call Connect
// asynchronously to any query.
//
// The returned connection is only used by one goroutine at a
// time.
func (c *seataConnector) Connect(ctx context.Context) (driver.Conn, error) {
conn, err := c.target.Connect(ctx)
if err != nil {
return nil, err
}
return &Conn{
targetConn: conn,
res: c.res,
txCtx: types.NewTxCtx(),
autoCommit: true,
dbName: c.cfg.DBName,
dbType: types.DBTypeMySQL,
}, nil
}
// Driver returns the underlying Driver of the Connector,
// mainly to maintain compatibility with the Driver method
// on sql.DB.
func (c *seataConnector) Driver() driver.Driver {
c.once.Do(func() {
d := c.target.Driver()
c.driver = d
})
return &seataDriver{
target: c.driver,
}
}