150 lines
3.6 KiB
Go
150 lines
3.6 KiB
Go
// Copyright 2012 The Go-MySQL-Driver Authors. All rights reserved.
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//
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// This Source Code Form is subject to the terms of the Mozilla Public
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// License, v. 2.0. If a copy of the MPL was not distributed with this file,
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// You can obtain one at http://mozilla.org/MPL/2.0/.
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// Go MySQL Driver - A MySQL-Driver for Go's database/sql package
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//
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// The driver should be used via the database/sql package:
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//
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// import "database/sql"
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// import _ "github.com/go-sql-driver/mysql"
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//
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// db, err := sql.Open("mysql", "user:password@/dbname")
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//
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// See https://github.com/go-sql-driver/mysql#usage for details
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package mysql
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import (
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"database/sql"
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"database/sql/driver"
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"net"
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)
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// This struct is exported to make the driver directly accessible.
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// In general the driver is used via the database/sql package.
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type MySQLDriver struct{}
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// DialFunc is a function which can be used to establish the network connection.
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// Custom dial functions must be registered with RegisterDial
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type DialFunc func(addr string) (net.Conn, error)
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var dials map[string]DialFunc
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// RegisterDial registers a custom dial function. It can then be used by the
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// network address mynet(addr), where mynet is the registered new network.
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// addr is passed as a parameter to the dial function.
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func RegisterDial(net string, dial DialFunc) {
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if dials == nil {
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dials = make(map[string]DialFunc)
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}
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dials[net] = dial
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}
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// Open new Connection.
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// See https://github.com/go-sql-driver/mysql#dsn-data-source-name for how
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// the DSN string is formated
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func (d MySQLDriver) Open(dsn string) (driver.Conn, error) {
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var err error
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// New mysqlConn
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mc := &mysqlConn{
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maxPacketAllowed: maxPacketSize,
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maxWriteSize: maxPacketSize - 1,
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}
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mc.cfg, err = parseDSN(dsn)
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if err != nil {
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return nil, err
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}
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// Connect to Server
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if dial, ok := dials[mc.cfg.net]; ok {
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mc.netConn, err = dial(mc.cfg.addr)
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} else {
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nd := net.Dialer{Timeout: mc.cfg.timeout}
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mc.netConn, err = nd.Dial(mc.cfg.net, mc.cfg.addr)
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}
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if err != nil {
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return nil, err
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}
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// Enable TCP Keepalives on TCP connections
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if tc, ok := mc.netConn.(*net.TCPConn); ok {
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if err := tc.SetKeepAlive(true); err != nil {
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// Don't send COM_QUIT before handshake.
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mc.netConn.Close()
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mc.netConn = nil
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return nil, err
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}
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}
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mc.buf = newBuffer(mc.netConn)
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// Reading Handshake Initialization Packet
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cipher, err := mc.readInitPacket()
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if err != nil {
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mc.Close()
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return nil, err
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}
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// Send Client Authentication Packet
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if err = mc.writeAuthPacket(cipher); err != nil {
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mc.Close()
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return nil, err
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}
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// Read Result Packet
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err = mc.readResultOK()
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if err != nil {
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// Retry with old authentication method, if allowed
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if mc.cfg != nil && mc.cfg.allowOldPasswords && err == ErrOldPassword {
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if err = mc.writeOldAuthPacket(cipher); err != nil {
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mc.Close()
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return nil, err
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}
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if err = mc.readResultOK(); err != nil {
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mc.Close()
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return nil, err
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}
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} else if mc.cfg != nil && mc.cfg.allowCleartextPasswords && err == ErrCleartextPassword {
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if err = mc.writeClearAuthPacket(); err != nil {
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mc.Close()
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return nil, err
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}
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if err = mc.readResultOK(); err != nil {
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mc.Close()
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return nil, err
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}
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} else {
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mc.Close()
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return nil, err
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}
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}
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// Get max allowed packet size
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maxap, err := mc.getSystemVar("max_allowed_packet")
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if err != nil {
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mc.Close()
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return nil, err
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}
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mc.maxPacketAllowed = stringToInt(maxap) - 1
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if mc.maxPacketAllowed < maxPacketSize {
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mc.maxWriteSize = mc.maxPacketAllowed
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}
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// Handle DSN Params
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err = mc.handleParams()
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if err != nil {
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mc.Close()
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return nil, err
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}
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return mc, nil
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}
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func init() {
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sql.Register("mysql", &MySQLDriver{})
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}
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