mirror of
https://github.com/go-gitea/gitea
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1272 lines
30 KiB
Go
1272 lines
30 KiB
Go
// Go MySQL Driver - A MySQL-Driver for Go's database/sql package
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//
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// 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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package mysql
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import (
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"bytes"
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"crypto/tls"
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"database/sql/driver"
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"encoding/binary"
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"errors"
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"fmt"
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"io"
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"math"
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"time"
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)
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// Packets documentation:
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// http://dev.mysql.com/doc/internals/en/client-server-protocol.html
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// Read packet to buffer 'data'
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func (mc *mysqlConn) readPacket() ([]byte, error) {
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var payload []byte
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for {
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// Read packet header
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data, err := mc.buf.readNext(4)
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if err != nil {
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errLog.Print(err)
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mc.Close()
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return nil, driver.ErrBadConn
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}
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// Packet Length [24 bit]
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pktLen := int(uint32(data[0]) | uint32(data[1])<<8 | uint32(data[2])<<16)
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if pktLen < 1 {
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errLog.Print(ErrMalformPkt)
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mc.Close()
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return nil, driver.ErrBadConn
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}
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// Check Packet Sync [8 bit]
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if data[3] != mc.sequence {
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if data[3] > mc.sequence {
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return nil, ErrPktSyncMul
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}
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return nil, ErrPktSync
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}
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mc.sequence++
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// Read packet body [pktLen bytes]
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data, err = mc.buf.readNext(pktLen)
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if err != nil {
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errLog.Print(err)
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mc.Close()
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return nil, driver.ErrBadConn
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}
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isLastPacket := (pktLen < maxPacketSize)
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// Zero allocations for non-splitting packets
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if isLastPacket && payload == nil {
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return data, nil
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}
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payload = append(payload, data...)
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if isLastPacket {
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return payload, nil
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}
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}
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}
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// Write packet buffer 'data'
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func (mc *mysqlConn) writePacket(data []byte) error {
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pktLen := len(data) - 4
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if pktLen > mc.maxAllowedPacket {
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return ErrPktTooLarge
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}
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for {
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var size int
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if pktLen >= maxPacketSize {
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data[0] = 0xff
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data[1] = 0xff
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data[2] = 0xff
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size = maxPacketSize
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} else {
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data[0] = byte(pktLen)
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data[1] = byte(pktLen >> 8)
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data[2] = byte(pktLen >> 16)
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size = pktLen
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}
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data[3] = mc.sequence
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// Write packet
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if mc.writeTimeout > 0 {
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if err := mc.netConn.SetWriteDeadline(time.Now().Add(mc.writeTimeout)); err != nil {
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return err
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}
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}
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n, err := mc.netConn.Write(data[:4+size])
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if err == nil && n == 4+size {
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mc.sequence++
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if size != maxPacketSize {
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return nil
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}
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pktLen -= size
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data = data[size:]
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continue
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}
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// Handle error
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if err == nil { // n != len(data)
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errLog.Print(ErrMalformPkt)
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} else {
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errLog.Print(err)
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}
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return driver.ErrBadConn
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}
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}
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/******************************************************************************
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* Initialisation Process *
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******************************************************************************/
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// Handshake Initialization Packet
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// http://dev.mysql.com/doc/internals/en/connection-phase-packets.html#packet-Protocol::Handshake
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func (mc *mysqlConn) readInitPacket() ([]byte, error) {
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data, err := mc.readPacket()
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if err != nil {
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return nil, err
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}
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if data[0] == iERR {
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return nil, mc.handleErrorPacket(data)
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}
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// protocol version [1 byte]
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if data[0] < minProtocolVersion {
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return nil, fmt.Errorf(
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"unsupported protocol version %d. Version %d or higher is required",
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data[0],
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minProtocolVersion,
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)
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}
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// server version [null terminated string]
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// connection id [4 bytes]
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pos := 1 + bytes.IndexByte(data[1:], 0x00) + 1 + 4
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// first part of the password cipher [8 bytes]
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cipher := data[pos : pos+8]
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// (filler) always 0x00 [1 byte]
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pos += 8 + 1
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// capability flags (lower 2 bytes) [2 bytes]
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mc.flags = clientFlag(binary.LittleEndian.Uint16(data[pos : pos+2]))
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if mc.flags&clientProtocol41 == 0 {
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return nil, ErrOldProtocol
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}
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if mc.flags&clientSSL == 0 && mc.cfg.tls != nil {
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return nil, ErrNoTLS
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}
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pos += 2
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if len(data) > pos {
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// character set [1 byte]
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// status flags [2 bytes]
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// capability flags (upper 2 bytes) [2 bytes]
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// length of auth-plugin-data [1 byte]
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// reserved (all [00]) [10 bytes]
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pos += 1 + 2 + 2 + 1 + 10
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// second part of the password cipher [mininum 13 bytes],
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// where len=MAX(13, length of auth-plugin-data - 8)
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//
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// The web documentation is ambiguous about the length. However,
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// according to mysql-5.7/sql/auth/sql_authentication.cc line 538,
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// the 13th byte is "\0 byte, terminating the second part of
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// a scramble". So the second part of the password cipher is
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// a NULL terminated string that's at least 13 bytes with the
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// last byte being NULL.
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//
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// The official Python library uses the fixed length 12
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// which seems to work but technically could have a hidden bug.
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cipher = append(cipher, data[pos:pos+12]...)
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// TODO: Verify string termination
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// EOF if version (>= 5.5.7 and < 5.5.10) or (>= 5.6.0 and < 5.6.2)
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// \NUL otherwise
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//
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//if data[len(data)-1] == 0 {
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// return
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//}
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//return ErrMalformPkt
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// make a memory safe copy of the cipher slice
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var b [20]byte
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copy(b[:], cipher)
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return b[:], nil
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}
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// make a memory safe copy of the cipher slice
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var b [8]byte
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copy(b[:], cipher)
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return b[:], nil
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}
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// Client Authentication Packet
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// http://dev.mysql.com/doc/internals/en/connection-phase-packets.html#packet-Protocol::HandshakeResponse
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func (mc *mysqlConn) writeAuthPacket(cipher []byte) error {
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// Adjust client flags based on server support
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clientFlags := clientProtocol41 |
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clientSecureConn |
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clientLongPassword |
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clientTransactions |
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clientLocalFiles |
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clientPluginAuth |
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clientMultiResults |
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mc.flags&clientLongFlag
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if mc.cfg.ClientFoundRows {
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clientFlags |= clientFoundRows
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}
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// To enable TLS / SSL
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if mc.cfg.tls != nil {
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clientFlags |= clientSSL
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}
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if mc.cfg.MultiStatements {
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clientFlags |= clientMultiStatements
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}
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// User Password
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scrambleBuff := scramblePassword(cipher, []byte(mc.cfg.Passwd))
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pktLen := 4 + 4 + 1 + 23 + len(mc.cfg.User) + 1 + 1 + len(scrambleBuff) + 21 + 1
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// To specify a db name
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if n := len(mc.cfg.DBName); n > 0 {
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clientFlags |= clientConnectWithDB
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pktLen += n + 1
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}
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// Calculate packet length and get buffer with that size
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data := mc.buf.takeSmallBuffer(pktLen + 4)
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if data == nil {
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// can not take the buffer. Something must be wrong with the connection
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errLog.Print(ErrBusyBuffer)
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return driver.ErrBadConn
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}
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// ClientFlags [32 bit]
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data[4] = byte(clientFlags)
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data[5] = byte(clientFlags >> 8)
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data[6] = byte(clientFlags >> 16)
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data[7] = byte(clientFlags >> 24)
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// MaxPacketSize [32 bit] (none)
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data[8] = 0x00
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data[9] = 0x00
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data[10] = 0x00
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data[11] = 0x00
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// Charset [1 byte]
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var found bool
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data[12], found = collations[mc.cfg.Collation]
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if !found {
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// Note possibility for false negatives:
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// could be triggered although the collation is valid if the
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// collations map does not contain entries the server supports.
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return errors.New("unknown collation")
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}
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// SSL Connection Request Packet
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// http://dev.mysql.com/doc/internals/en/connection-phase-packets.html#packet-Protocol::SSLRequest
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if mc.cfg.tls != nil {
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// Send TLS / SSL request packet
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if err := mc.writePacket(data[:(4+4+1+23)+4]); err != nil {
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return err
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}
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// Switch to TLS
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tlsConn := tls.Client(mc.netConn, mc.cfg.tls)
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if err := tlsConn.Handshake(); err != nil {
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return err
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}
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mc.netConn = tlsConn
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mc.buf.nc = tlsConn
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}
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// Filler [23 bytes] (all 0x00)
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pos := 13
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for ; pos < 13+23; pos++ {
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data[pos] = 0
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}
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// User [null terminated string]
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if len(mc.cfg.User) > 0 {
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pos += copy(data[pos:], mc.cfg.User)
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}
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data[pos] = 0x00
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pos++
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// ScrambleBuffer [length encoded integer]
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data[pos] = byte(len(scrambleBuff))
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pos += 1 + copy(data[pos+1:], scrambleBuff)
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// Databasename [null terminated string]
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if len(mc.cfg.DBName) > 0 {
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pos += copy(data[pos:], mc.cfg.DBName)
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data[pos] = 0x00
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pos++
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}
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// Assume native client during response
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pos += copy(data[pos:], "mysql_native_password")
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data[pos] = 0x00
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// Send Auth packet
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return mc.writePacket(data)
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}
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// Client old authentication packet
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// http://dev.mysql.com/doc/internals/en/connection-phase-packets.html#packet-Protocol::AuthSwitchResponse
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func (mc *mysqlConn) writeOldAuthPacket(cipher []byte) error {
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// User password
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scrambleBuff := scrambleOldPassword(cipher, []byte(mc.cfg.Passwd))
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// Calculate the packet length and add a tailing 0
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pktLen := len(scrambleBuff) + 1
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data := mc.buf.takeSmallBuffer(4 + pktLen)
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if data == nil {
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// can not take the buffer. Something must be wrong with the connection
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errLog.Print(ErrBusyBuffer)
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return driver.ErrBadConn
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}
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// Add the scrambled password [null terminated string]
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copy(data[4:], scrambleBuff)
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data[4+pktLen-1] = 0x00
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return mc.writePacket(data)
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}
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// Client clear text authentication packet
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// http://dev.mysql.com/doc/internals/en/connection-phase-packets.html#packet-Protocol::AuthSwitchResponse
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func (mc *mysqlConn) writeClearAuthPacket() error {
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// Calculate the packet length and add a tailing 0
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pktLen := len(mc.cfg.Passwd) + 1
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data := mc.buf.takeSmallBuffer(4 + pktLen)
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if data == nil {
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// can not take the buffer. Something must be wrong with the connection
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errLog.Print(ErrBusyBuffer)
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return driver.ErrBadConn
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}
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// Add the clear password [null terminated string]
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copy(data[4:], mc.cfg.Passwd)
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data[4+pktLen-1] = 0x00
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return mc.writePacket(data)
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}
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// Native password authentication method
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// http://dev.mysql.com/doc/internals/en/connection-phase-packets.html#packet-Protocol::AuthSwitchResponse
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func (mc *mysqlConn) writeNativeAuthPacket(cipher []byte) error {
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scrambleBuff := scramblePassword(cipher, []byte(mc.cfg.Passwd))
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// Calculate the packet length and add a tailing 0
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pktLen := len(scrambleBuff)
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data := mc.buf.takeSmallBuffer(4 + pktLen)
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if data == nil {
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// can not take the buffer. Something must be wrong with the connection
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errLog.Print(ErrBusyBuffer)
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return driver.ErrBadConn
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}
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// Add the scramble
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copy(data[4:], scrambleBuff)
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return mc.writePacket(data)
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}
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/******************************************************************************
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* Command Packets *
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******************************************************************************/
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func (mc *mysqlConn) writeCommandPacket(command byte) error {
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// Reset Packet Sequence
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mc.sequence = 0
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data := mc.buf.takeSmallBuffer(4 + 1)
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if data == nil {
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// can not take the buffer. Something must be wrong with the connection
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errLog.Print(ErrBusyBuffer)
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return driver.ErrBadConn
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}
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// Add command byte
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data[4] = command
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// Send CMD packet
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return mc.writePacket(data)
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}
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func (mc *mysqlConn) writeCommandPacketStr(command byte, arg string) error {
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// Reset Packet Sequence
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mc.sequence = 0
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pktLen := 1 + len(arg)
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data := mc.buf.takeBuffer(pktLen + 4)
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if data == nil {
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// can not take the buffer. Something must be wrong with the connection
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errLog.Print(ErrBusyBuffer)
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return driver.ErrBadConn
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}
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// Add command byte
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data[4] = command
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// Add arg
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copy(data[5:], arg)
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// Send CMD packet
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return mc.writePacket(data)
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}
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func (mc *mysqlConn) writeCommandPacketUint32(command byte, arg uint32) error {
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// Reset Packet Sequence
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mc.sequence = 0
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data := mc.buf.takeSmallBuffer(4 + 1 + 4)
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if data == nil {
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// can not take the buffer. Something must be wrong with the connection
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errLog.Print(ErrBusyBuffer)
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return driver.ErrBadConn
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}
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// Add command byte
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data[4] = command
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// Add arg [32 bit]
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data[5] = byte(arg)
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data[6] = byte(arg >> 8)
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data[7] = byte(arg >> 16)
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data[8] = byte(arg >> 24)
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// Send CMD packet
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return mc.writePacket(data)
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}
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/******************************************************************************
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* Result Packets *
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******************************************************************************/
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// Returns error if Packet is not an 'Result OK'-Packet
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func (mc *mysqlConn) readResultOK() ([]byte, error) {
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data, err := mc.readPacket()
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if err == nil {
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// packet indicator
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switch data[0] {
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case iOK:
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return nil, mc.handleOkPacket(data)
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case iEOF:
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if len(data) > 1 {
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pluginEndIndex := bytes.IndexByte(data, 0x00)
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plugin := string(data[1:pluginEndIndex])
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cipher := data[pluginEndIndex+1 : len(data)-1]
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if plugin == "mysql_old_password" {
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// using old_passwords
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return cipher, ErrOldPassword
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} else if plugin == "mysql_clear_password" {
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// using clear text password
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return cipher, ErrCleartextPassword
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} else if plugin == "mysql_native_password" {
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// using mysql default authentication method
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return cipher, ErrNativePassword
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} else {
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return cipher, ErrUnknownPlugin
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}
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} else {
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return nil, ErrOldPassword
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}
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default: // Error otherwise
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return nil, mc.handleErrorPacket(data)
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}
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}
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return nil, err
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}
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// Result Set Header Packet
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// http://dev.mysql.com/doc/internals/en/com-query-response.html#packet-ProtocolText::Resultset
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func (mc *mysqlConn) readResultSetHeaderPacket() (int, error) {
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data, err := mc.readPacket()
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if err == nil {
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switch data[0] {
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case iOK:
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return 0, mc.handleOkPacket(data)
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case iERR:
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return 0, mc.handleErrorPacket(data)
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case iLocalInFile:
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return 0, mc.handleInFileRequest(string(data[1:]))
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}
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// column count
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num, _, n := readLengthEncodedInteger(data)
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if n-len(data) == 0 {
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return int(num), nil
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}
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return 0, ErrMalformPkt
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}
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return 0, err
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}
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|
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// Error Packet
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// http://dev.mysql.com/doc/internals/en/generic-response-packets.html#packet-ERR_Packet
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func (mc *mysqlConn) handleErrorPacket(data []byte) error {
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if data[0] != iERR {
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return ErrMalformPkt
|
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}
|
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|
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// 0xff [1 byte]
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// Error Number [16 bit uint]
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errno := binary.LittleEndian.Uint16(data[1:3])
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|
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pos := 3
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|
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// SQL State [optional: # + 5bytes string]
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if data[3] == 0x23 {
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//sqlstate := string(data[4 : 4+5])
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pos = 9
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}
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|
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// Error Message [string]
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return &MySQLError{
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Number: errno,
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Message: string(data[pos:]),
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}
|
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}
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|
|
func readStatus(b []byte) statusFlag {
|
|
return statusFlag(b[0]) | statusFlag(b[1])<<8
|
|
}
|
|
|
|
// Ok Packet
|
|
// http://dev.mysql.com/doc/internals/en/generic-response-packets.html#packet-OK_Packet
|
|
func (mc *mysqlConn) handleOkPacket(data []byte) error {
|
|
var n, m int
|
|
|
|
// 0x00 [1 byte]
|
|
|
|
// Affected rows [Length Coded Binary]
|
|
mc.affectedRows, _, n = readLengthEncodedInteger(data[1:])
|
|
|
|
// Insert id [Length Coded Binary]
|
|
mc.insertId, _, m = readLengthEncodedInteger(data[1+n:])
|
|
|
|
// server_status [2 bytes]
|
|
mc.status = readStatus(data[1+n+m : 1+n+m+2])
|
|
if err := mc.discardResults(); err != nil {
|
|
return err
|
|
}
|
|
|
|
// warning count [2 bytes]
|
|
if !mc.strict {
|
|
return nil
|
|
}
|
|
|
|
pos := 1 + n + m + 2
|
|
if binary.LittleEndian.Uint16(data[pos:pos+2]) > 0 {
|
|
return mc.getWarnings()
|
|
}
|
|
return nil
|
|
}
|
|
|
|
// Read Packets as Field Packets until EOF-Packet or an Error appears
|
|
// http://dev.mysql.com/doc/internals/en/com-query-response.html#packet-Protocol::ColumnDefinition41
|
|
func (mc *mysqlConn) readColumns(count int) ([]mysqlField, error) {
|
|
columns := make([]mysqlField, count)
|
|
|
|
for i := 0; ; i++ {
|
|
data, err := mc.readPacket()
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
// EOF Packet
|
|
if data[0] == iEOF && (len(data) == 5 || len(data) == 1) {
|
|
if i == count {
|
|
return columns, nil
|
|
}
|
|
return nil, fmt.Errorf("column count mismatch n:%d len:%d", count, len(columns))
|
|
}
|
|
|
|
// Catalog
|
|
pos, err := skipLengthEncodedString(data)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
// Database [len coded string]
|
|
n, err := skipLengthEncodedString(data[pos:])
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
pos += n
|
|
|
|
// Table [len coded string]
|
|
if mc.cfg.ColumnsWithAlias {
|
|
tableName, _, n, err := readLengthEncodedString(data[pos:])
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
pos += n
|
|
columns[i].tableName = string(tableName)
|
|
} else {
|
|
n, err = skipLengthEncodedString(data[pos:])
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
pos += n
|
|
}
|
|
|
|
// Original table [len coded string]
|
|
n, err = skipLengthEncodedString(data[pos:])
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
pos += n
|
|
|
|
// Name [len coded string]
|
|
name, _, n, err := readLengthEncodedString(data[pos:])
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
columns[i].name = string(name)
|
|
pos += n
|
|
|
|
// Original name [len coded string]
|
|
n, err = skipLengthEncodedString(data[pos:])
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
// Filler [uint8]
|
|
// Charset [charset, collation uint8]
|
|
// Length [uint32]
|
|
pos += n + 1 + 2 + 4
|
|
|
|
// Field type [uint8]
|
|
columns[i].fieldType = data[pos]
|
|
pos++
|
|
|
|
// Flags [uint16]
|
|
columns[i].flags = fieldFlag(binary.LittleEndian.Uint16(data[pos : pos+2]))
|
|
pos += 2
|
|
|
|
// Decimals [uint8]
|
|
columns[i].decimals = data[pos]
|
|
//pos++
|
|
|
|
// Default value [len coded binary]
|
|
//if pos < len(data) {
|
|
// defaultVal, _, err = bytesToLengthCodedBinary(data[pos:])
|
|
//}
|
|
}
|
|
}
|
|
|
|
// Read Packets as Field Packets until EOF-Packet or an Error appears
|
|
// http://dev.mysql.com/doc/internals/en/com-query-response.html#packet-ProtocolText::ResultsetRow
|
|
func (rows *textRows) readRow(dest []driver.Value) error {
|
|
mc := rows.mc
|
|
|
|
data, err := mc.readPacket()
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
// EOF Packet
|
|
if data[0] == iEOF && len(data) == 5 {
|
|
// server_status [2 bytes]
|
|
rows.mc.status = readStatus(data[3:])
|
|
if err := rows.mc.discardResults(); err != nil {
|
|
return err
|
|
}
|
|
rows.mc = nil
|
|
return io.EOF
|
|
}
|
|
if data[0] == iERR {
|
|
rows.mc = nil
|
|
return mc.handleErrorPacket(data)
|
|
}
|
|
|
|
// RowSet Packet
|
|
var n int
|
|
var isNull bool
|
|
pos := 0
|
|
|
|
for i := range dest {
|
|
// Read bytes and convert to string
|
|
dest[i], isNull, n, err = readLengthEncodedString(data[pos:])
|
|
pos += n
|
|
if err == nil {
|
|
if !isNull {
|
|
if !mc.parseTime {
|
|
continue
|
|
} else {
|
|
switch rows.columns[i].fieldType {
|
|
case fieldTypeTimestamp, fieldTypeDateTime,
|
|
fieldTypeDate, fieldTypeNewDate:
|
|
dest[i], err = parseDateTime(
|
|
string(dest[i].([]byte)),
|
|
mc.cfg.Loc,
|
|
)
|
|
if err == nil {
|
|
continue
|
|
}
|
|
default:
|
|
continue
|
|
}
|
|
}
|
|
|
|
} else {
|
|
dest[i] = nil
|
|
continue
|
|
}
|
|
}
|
|
return err // err != nil
|
|
}
|
|
|
|
return nil
|
|
}
|
|
|
|
// Reads Packets until EOF-Packet or an Error appears. Returns count of Packets read
|
|
func (mc *mysqlConn) readUntilEOF() error {
|
|
for {
|
|
data, err := mc.readPacket()
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
switch data[0] {
|
|
case iERR:
|
|
return mc.handleErrorPacket(data)
|
|
case iEOF:
|
|
if len(data) == 5 {
|
|
mc.status = readStatus(data[3:])
|
|
}
|
|
return nil
|
|
}
|
|
}
|
|
}
|
|
|
|
/******************************************************************************
|
|
* Prepared Statements *
|
|
******************************************************************************/
|
|
|
|
// Prepare Result Packets
|
|
// http://dev.mysql.com/doc/internals/en/com-stmt-prepare-response.html
|
|
func (stmt *mysqlStmt) readPrepareResultPacket() (uint16, error) {
|
|
data, err := stmt.mc.readPacket()
|
|
if err == nil {
|
|
// packet indicator [1 byte]
|
|
if data[0] != iOK {
|
|
return 0, stmt.mc.handleErrorPacket(data)
|
|
}
|
|
|
|
// statement id [4 bytes]
|
|
stmt.id = binary.LittleEndian.Uint32(data[1:5])
|
|
|
|
// Column count [16 bit uint]
|
|
columnCount := binary.LittleEndian.Uint16(data[5:7])
|
|
|
|
// Param count [16 bit uint]
|
|
stmt.paramCount = int(binary.LittleEndian.Uint16(data[7:9]))
|
|
|
|
// Reserved [8 bit]
|
|
|
|
// Warning count [16 bit uint]
|
|
if !stmt.mc.strict {
|
|
return columnCount, nil
|
|
}
|
|
|
|
// Check for warnings count > 0, only available in MySQL > 4.1
|
|
if len(data) >= 12 && binary.LittleEndian.Uint16(data[10:12]) > 0 {
|
|
return columnCount, stmt.mc.getWarnings()
|
|
}
|
|
return columnCount, nil
|
|
}
|
|
return 0, err
|
|
}
|
|
|
|
// http://dev.mysql.com/doc/internals/en/com-stmt-send-long-data.html
|
|
func (stmt *mysqlStmt) writeCommandLongData(paramID int, arg []byte) error {
|
|
maxLen := stmt.mc.maxAllowedPacket - 1
|
|
pktLen := maxLen
|
|
|
|
// After the header (bytes 0-3) follows before the data:
|
|
// 1 byte command
|
|
// 4 bytes stmtID
|
|
// 2 bytes paramID
|
|
const dataOffset = 1 + 4 + 2
|
|
|
|
// Can not use the write buffer since
|
|
// a) the buffer is too small
|
|
// b) it is in use
|
|
data := make([]byte, 4+1+4+2+len(arg))
|
|
|
|
copy(data[4+dataOffset:], arg)
|
|
|
|
for argLen := len(arg); argLen > 0; argLen -= pktLen - dataOffset {
|
|
if dataOffset+argLen < maxLen {
|
|
pktLen = dataOffset + argLen
|
|
}
|
|
|
|
stmt.mc.sequence = 0
|
|
// Add command byte [1 byte]
|
|
data[4] = comStmtSendLongData
|
|
|
|
// Add stmtID [32 bit]
|
|
data[5] = byte(stmt.id)
|
|
data[6] = byte(stmt.id >> 8)
|
|
data[7] = byte(stmt.id >> 16)
|
|
data[8] = byte(stmt.id >> 24)
|
|
|
|
// Add paramID [16 bit]
|
|
data[9] = byte(paramID)
|
|
data[10] = byte(paramID >> 8)
|
|
|
|
// Send CMD packet
|
|
err := stmt.mc.writePacket(data[:4+pktLen])
|
|
if err == nil {
|
|
data = data[pktLen-dataOffset:]
|
|
continue
|
|
}
|
|
return err
|
|
|
|
}
|
|
|
|
// Reset Packet Sequence
|
|
stmt.mc.sequence = 0
|
|
return nil
|
|
}
|
|
|
|
// Execute Prepared Statement
|
|
// http://dev.mysql.com/doc/internals/en/com-stmt-execute.html
|
|
func (stmt *mysqlStmt) writeExecutePacket(args []driver.Value) error {
|
|
if len(args) != stmt.paramCount {
|
|
return fmt.Errorf(
|
|
"argument count mismatch (got: %d; has: %d)",
|
|
len(args),
|
|
stmt.paramCount,
|
|
)
|
|
}
|
|
|
|
const minPktLen = 4 + 1 + 4 + 1 + 4
|
|
mc := stmt.mc
|
|
|
|
// Reset packet-sequence
|
|
mc.sequence = 0
|
|
|
|
var data []byte
|
|
|
|
if len(args) == 0 {
|
|
data = mc.buf.takeBuffer(minPktLen)
|
|
} else {
|
|
data = mc.buf.takeCompleteBuffer()
|
|
}
|
|
if data == nil {
|
|
// can not take the buffer. Something must be wrong with the connection
|
|
errLog.Print(ErrBusyBuffer)
|
|
return driver.ErrBadConn
|
|
}
|
|
|
|
// command [1 byte]
|
|
data[4] = comStmtExecute
|
|
|
|
// statement_id [4 bytes]
|
|
data[5] = byte(stmt.id)
|
|
data[6] = byte(stmt.id >> 8)
|
|
data[7] = byte(stmt.id >> 16)
|
|
data[8] = byte(stmt.id >> 24)
|
|
|
|
// flags (0: CURSOR_TYPE_NO_CURSOR) [1 byte]
|
|
data[9] = 0x00
|
|
|
|
// iteration_count (uint32(1)) [4 bytes]
|
|
data[10] = 0x01
|
|
data[11] = 0x00
|
|
data[12] = 0x00
|
|
data[13] = 0x00
|
|
|
|
if len(args) > 0 {
|
|
pos := minPktLen
|
|
|
|
var nullMask []byte
|
|
if maskLen, typesLen := (len(args)+7)/8, 1+2*len(args); pos+maskLen+typesLen >= len(data) {
|
|
// buffer has to be extended but we don't know by how much so
|
|
// we depend on append after all data with known sizes fit.
|
|
// We stop at that because we deal with a lot of columns here
|
|
// which makes the required allocation size hard to guess.
|
|
tmp := make([]byte, pos+maskLen+typesLen)
|
|
copy(tmp[:pos], data[:pos])
|
|
data = tmp
|
|
nullMask = data[pos : pos+maskLen]
|
|
pos += maskLen
|
|
} else {
|
|
nullMask = data[pos : pos+maskLen]
|
|
for i := 0; i < maskLen; i++ {
|
|
nullMask[i] = 0
|
|
}
|
|
pos += maskLen
|
|
}
|
|
|
|
// newParameterBoundFlag 1 [1 byte]
|
|
data[pos] = 0x01
|
|
pos++
|
|
|
|
// type of each parameter [len(args)*2 bytes]
|
|
paramTypes := data[pos:]
|
|
pos += len(args) * 2
|
|
|
|
// value of each parameter [n bytes]
|
|
paramValues := data[pos:pos]
|
|
valuesCap := cap(paramValues)
|
|
|
|
for i, arg := range args {
|
|
// build NULL-bitmap
|
|
if arg == nil {
|
|
nullMask[i/8] |= 1 << (uint(i) & 7)
|
|
paramTypes[i+i] = fieldTypeNULL
|
|
paramTypes[i+i+1] = 0x00
|
|
continue
|
|
}
|
|
|
|
// cache types and values
|
|
switch v := arg.(type) {
|
|
case int64:
|
|
paramTypes[i+i] = fieldTypeLongLong
|
|
paramTypes[i+i+1] = 0x00
|
|
|
|
if cap(paramValues)-len(paramValues)-8 >= 0 {
|
|
paramValues = paramValues[:len(paramValues)+8]
|
|
binary.LittleEndian.PutUint64(
|
|
paramValues[len(paramValues)-8:],
|
|
uint64(v),
|
|
)
|
|
} else {
|
|
paramValues = append(paramValues,
|
|
uint64ToBytes(uint64(v))...,
|
|
)
|
|
}
|
|
|
|
case float64:
|
|
paramTypes[i+i] = fieldTypeDouble
|
|
paramTypes[i+i+1] = 0x00
|
|
|
|
if cap(paramValues)-len(paramValues)-8 >= 0 {
|
|
paramValues = paramValues[:len(paramValues)+8]
|
|
binary.LittleEndian.PutUint64(
|
|
paramValues[len(paramValues)-8:],
|
|
math.Float64bits(v),
|
|
)
|
|
} else {
|
|
paramValues = append(paramValues,
|
|
uint64ToBytes(math.Float64bits(v))...,
|
|
)
|
|
}
|
|
|
|
case bool:
|
|
paramTypes[i+i] = fieldTypeTiny
|
|
paramTypes[i+i+1] = 0x00
|
|
|
|
if v {
|
|
paramValues = append(paramValues, 0x01)
|
|
} else {
|
|
paramValues = append(paramValues, 0x00)
|
|
}
|
|
|
|
case []byte:
|
|
// Common case (non-nil value) first
|
|
if v != nil {
|
|
paramTypes[i+i] = fieldTypeString
|
|
paramTypes[i+i+1] = 0x00
|
|
|
|
if len(v) < mc.maxAllowedPacket-pos-len(paramValues)-(len(args)-(i+1))*64 {
|
|
paramValues = appendLengthEncodedInteger(paramValues,
|
|
uint64(len(v)),
|
|
)
|
|
paramValues = append(paramValues, v...)
|
|
} else {
|
|
if err := stmt.writeCommandLongData(i, v); err != nil {
|
|
return err
|
|
}
|
|
}
|
|
continue
|
|
}
|
|
|
|
// Handle []byte(nil) as a NULL value
|
|
nullMask[i/8] |= 1 << (uint(i) & 7)
|
|
paramTypes[i+i] = fieldTypeNULL
|
|
paramTypes[i+i+1] = 0x00
|
|
|
|
case string:
|
|
paramTypes[i+i] = fieldTypeString
|
|
paramTypes[i+i+1] = 0x00
|
|
|
|
if len(v) < mc.maxAllowedPacket-pos-len(paramValues)-(len(args)-(i+1))*64 {
|
|
paramValues = appendLengthEncodedInteger(paramValues,
|
|
uint64(len(v)),
|
|
)
|
|
paramValues = append(paramValues, v...)
|
|
} else {
|
|
if err := stmt.writeCommandLongData(i, []byte(v)); err != nil {
|
|
return err
|
|
}
|
|
}
|
|
|
|
case time.Time:
|
|
paramTypes[i+i] = fieldTypeString
|
|
paramTypes[i+i+1] = 0x00
|
|
|
|
var val []byte
|
|
if v.IsZero() {
|
|
val = []byte("0000-00-00")
|
|
} else {
|
|
val = []byte(v.In(mc.cfg.Loc).Format(timeFormat))
|
|
}
|
|
|
|
paramValues = appendLengthEncodedInteger(paramValues,
|
|
uint64(len(val)),
|
|
)
|
|
paramValues = append(paramValues, val...)
|
|
|
|
default:
|
|
return fmt.Errorf("can not convert type: %T", arg)
|
|
}
|
|
}
|
|
|
|
// Check if param values exceeded the available buffer
|
|
// In that case we must build the data packet with the new values buffer
|
|
if valuesCap != cap(paramValues) {
|
|
data = append(data[:pos], paramValues...)
|
|
mc.buf.buf = data
|
|
}
|
|
|
|
pos += len(paramValues)
|
|
data = data[:pos]
|
|
}
|
|
|
|
return mc.writePacket(data)
|
|
}
|
|
|
|
func (mc *mysqlConn) discardResults() error {
|
|
for mc.status&statusMoreResultsExists != 0 {
|
|
resLen, err := mc.readResultSetHeaderPacket()
|
|
if err != nil {
|
|
return err
|
|
}
|
|
if resLen > 0 {
|
|
// columns
|
|
if err := mc.readUntilEOF(); err != nil {
|
|
return err
|
|
}
|
|
// rows
|
|
if err := mc.readUntilEOF(); err != nil {
|
|
return err
|
|
}
|
|
} else {
|
|
mc.status &^= statusMoreResultsExists
|
|
}
|
|
}
|
|
return nil
|
|
}
|
|
|
|
// http://dev.mysql.com/doc/internals/en/binary-protocol-resultset-row.html
|
|
func (rows *binaryRows) readRow(dest []driver.Value) error {
|
|
data, err := rows.mc.readPacket()
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
// packet indicator [1 byte]
|
|
if data[0] != iOK {
|
|
// EOF Packet
|
|
if data[0] == iEOF && len(data) == 5 {
|
|
rows.mc.status = readStatus(data[3:])
|
|
if err := rows.mc.discardResults(); err != nil {
|
|
return err
|
|
}
|
|
rows.mc = nil
|
|
return io.EOF
|
|
}
|
|
rows.mc = nil
|
|
|
|
// Error otherwise
|
|
return rows.mc.handleErrorPacket(data)
|
|
}
|
|
|
|
// NULL-bitmap, [(column-count + 7 + 2) / 8 bytes]
|
|
pos := 1 + (len(dest)+7+2)>>3
|
|
nullMask := data[1:pos]
|
|
|
|
for i := range dest {
|
|
// Field is NULL
|
|
// (byte >> bit-pos) % 2 == 1
|
|
if ((nullMask[(i+2)>>3] >> uint((i+2)&7)) & 1) == 1 {
|
|
dest[i] = nil
|
|
continue
|
|
}
|
|
|
|
// Convert to byte-coded string
|
|
switch rows.columns[i].fieldType {
|
|
case fieldTypeNULL:
|
|
dest[i] = nil
|
|
continue
|
|
|
|
// Numeric Types
|
|
case fieldTypeTiny:
|
|
if rows.columns[i].flags&flagUnsigned != 0 {
|
|
dest[i] = int64(data[pos])
|
|
} else {
|
|
dest[i] = int64(int8(data[pos]))
|
|
}
|
|
pos++
|
|
continue
|
|
|
|
case fieldTypeShort, fieldTypeYear:
|
|
if rows.columns[i].flags&flagUnsigned != 0 {
|
|
dest[i] = int64(binary.LittleEndian.Uint16(data[pos : pos+2]))
|
|
} else {
|
|
dest[i] = int64(int16(binary.LittleEndian.Uint16(data[pos : pos+2])))
|
|
}
|
|
pos += 2
|
|
continue
|
|
|
|
case fieldTypeInt24, fieldTypeLong:
|
|
if rows.columns[i].flags&flagUnsigned != 0 {
|
|
dest[i] = int64(binary.LittleEndian.Uint32(data[pos : pos+4]))
|
|
} else {
|
|
dest[i] = int64(int32(binary.LittleEndian.Uint32(data[pos : pos+4])))
|
|
}
|
|
pos += 4
|
|
continue
|
|
|
|
case fieldTypeLongLong:
|
|
if rows.columns[i].flags&flagUnsigned != 0 {
|
|
val := binary.LittleEndian.Uint64(data[pos : pos+8])
|
|
if val > math.MaxInt64 {
|
|
dest[i] = uint64ToString(val)
|
|
} else {
|
|
dest[i] = int64(val)
|
|
}
|
|
} else {
|
|
dest[i] = int64(binary.LittleEndian.Uint64(data[pos : pos+8]))
|
|
}
|
|
pos += 8
|
|
continue
|
|
|
|
case fieldTypeFloat:
|
|
dest[i] = float32(math.Float32frombits(binary.LittleEndian.Uint32(data[pos : pos+4])))
|
|
pos += 4
|
|
continue
|
|
|
|
case fieldTypeDouble:
|
|
dest[i] = math.Float64frombits(binary.LittleEndian.Uint64(data[pos : pos+8]))
|
|
pos += 8
|
|
continue
|
|
|
|
// Length coded Binary Strings
|
|
case fieldTypeDecimal, fieldTypeNewDecimal, fieldTypeVarChar,
|
|
fieldTypeBit, fieldTypeEnum, fieldTypeSet, fieldTypeTinyBLOB,
|
|
fieldTypeMediumBLOB, fieldTypeLongBLOB, fieldTypeBLOB,
|
|
fieldTypeVarString, fieldTypeString, fieldTypeGeometry, fieldTypeJSON:
|
|
var isNull bool
|
|
var n int
|
|
dest[i], isNull, n, err = readLengthEncodedString(data[pos:])
|
|
pos += n
|
|
if err == nil {
|
|
if !isNull {
|
|
continue
|
|
} else {
|
|
dest[i] = nil
|
|
continue
|
|
}
|
|
}
|
|
return err
|
|
|
|
case
|
|
fieldTypeDate, fieldTypeNewDate, // Date YYYY-MM-DD
|
|
fieldTypeTime, // Time [-][H]HH:MM:SS[.fractal]
|
|
fieldTypeTimestamp, fieldTypeDateTime: // Timestamp YYYY-MM-DD HH:MM:SS[.fractal]
|
|
|
|
num, isNull, n := readLengthEncodedInteger(data[pos:])
|
|
pos += n
|
|
|
|
switch {
|
|
case isNull:
|
|
dest[i] = nil
|
|
continue
|
|
case rows.columns[i].fieldType == fieldTypeTime:
|
|
// database/sql does not support an equivalent to TIME, return a string
|
|
var dstlen uint8
|
|
switch decimals := rows.columns[i].decimals; decimals {
|
|
case 0x00, 0x1f:
|
|
dstlen = 8
|
|
case 1, 2, 3, 4, 5, 6:
|
|
dstlen = 8 + 1 + decimals
|
|
default:
|
|
return fmt.Errorf(
|
|
"protocol error, illegal decimals value %d",
|
|
rows.columns[i].decimals,
|
|
)
|
|
}
|
|
dest[i], err = formatBinaryDateTime(data[pos:pos+int(num)], dstlen, true)
|
|
case rows.mc.parseTime:
|
|
dest[i], err = parseBinaryDateTime(num, data[pos:], rows.mc.cfg.Loc)
|
|
default:
|
|
var dstlen uint8
|
|
if rows.columns[i].fieldType == fieldTypeDate {
|
|
dstlen = 10
|
|
} else {
|
|
switch decimals := rows.columns[i].decimals; decimals {
|
|
case 0x00, 0x1f:
|
|
dstlen = 19
|
|
case 1, 2, 3, 4, 5, 6:
|
|
dstlen = 19 + 1 + decimals
|
|
default:
|
|
return fmt.Errorf(
|
|
"protocol error, illegal decimals value %d",
|
|
rows.columns[i].decimals,
|
|
)
|
|
}
|
|
}
|
|
dest[i], err = formatBinaryDateTime(data[pos:pos+int(num)], dstlen, false)
|
|
}
|
|
|
|
if err == nil {
|
|
pos += int(num)
|
|
continue
|
|
} else {
|
|
return err
|
|
}
|
|
|
|
// Please report if this happens!
|
|
default:
|
|
return fmt.Errorf("unknown field type %d", rows.columns[i].fieldType)
|
|
}
|
|
}
|
|
|
|
return nil
|
|
}
|