651 lines
14 KiB
Go
651 lines
14 KiB
Go
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// 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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"context"
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"database/sql"
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"database/sql/driver"
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"encoding/json"
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"io"
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"net"
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"strconv"
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"strings"
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"time"
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)
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type mysqlConn struct {
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buf buffer
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netConn net.Conn
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rawConn net.Conn // underlying connection when netConn is TLS connection.
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affectedRows uint64
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insertId uint64
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cfg *Config
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maxAllowedPacket int
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maxWriteSize int
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writeTimeout time.Duration
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flags clientFlag
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status statusFlag
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sequence uint8
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parseTime bool
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reset bool // set when the Go SQL package calls ResetSession
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// for context support (Go 1.8+)
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watching bool
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watcher chan<- context.Context
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closech chan struct{}
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finished chan<- struct{}
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canceled atomicError // set non-nil if conn is canceled
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closed atomicBool // set when conn is closed, before closech is closed
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}
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// Handles parameters set in DSN after the connection is established
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func (mc *mysqlConn) handleParams() (err error) {
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var cmdSet strings.Builder
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for param, val := range mc.cfg.Params {
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switch param {
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// Charset: character_set_connection, character_set_client, character_set_results
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case "charset":
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charsets := strings.Split(val, ",")
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for i := range charsets {
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// ignore errors here - a charset may not exist
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err = mc.exec("SET NAMES " + charsets[i])
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if err == nil {
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break
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}
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}
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if err != nil {
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return
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}
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// Other system vars accumulated in a single SET command
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default:
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if cmdSet.Len() == 0 {
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// Heuristic: 29 chars for each other key=value to reduce reallocations
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cmdSet.Grow(4 + len(param) + 1 + len(val) + 30*(len(mc.cfg.Params)-1))
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cmdSet.WriteString("SET ")
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} else {
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cmdSet.WriteByte(',')
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}
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cmdSet.WriteString(param)
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cmdSet.WriteByte('=')
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cmdSet.WriteString(val)
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}
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}
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if cmdSet.Len() > 0 {
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err = mc.exec(cmdSet.String())
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if err != nil {
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return
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}
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}
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return
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}
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func (mc *mysqlConn) markBadConn(err error) error {
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if mc == nil {
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return err
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}
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if err != errBadConnNoWrite {
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return err
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}
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return driver.ErrBadConn
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}
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func (mc *mysqlConn) Begin() (driver.Tx, error) {
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return mc.begin(false)
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}
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func (mc *mysqlConn) begin(readOnly bool) (driver.Tx, error) {
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if mc.closed.IsSet() {
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errLog.Print(ErrInvalidConn)
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return nil, driver.ErrBadConn
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}
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var q string
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if readOnly {
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q = "START TRANSACTION READ ONLY"
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} else {
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q = "START TRANSACTION"
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}
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err := mc.exec(q)
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if err == nil {
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return &mysqlTx{mc}, err
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}
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return nil, mc.markBadConn(err)
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}
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func (mc *mysqlConn) Close() (err error) {
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// Makes Close idempotent
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if !mc.closed.IsSet() {
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err = mc.writeCommandPacket(comQuit)
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}
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mc.cleanup()
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return
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}
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// Closes the network connection and unsets internal variables. Do not call this
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// function after successfully authentication, call Close instead. This function
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// is called before auth or on auth failure because MySQL will have already
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// closed the network connection.
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func (mc *mysqlConn) cleanup() {
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if !mc.closed.TrySet(true) {
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return
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}
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// Makes cleanup idempotent
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close(mc.closech)
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if mc.netConn == nil {
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return
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}
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if err := mc.netConn.Close(); err != nil {
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errLog.Print(err)
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}
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}
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func (mc *mysqlConn) error() error {
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if mc.closed.IsSet() {
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if err := mc.canceled.Value(); err != nil {
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return err
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}
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return ErrInvalidConn
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}
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return nil
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}
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func (mc *mysqlConn) Prepare(query string) (driver.Stmt, error) {
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if mc.closed.IsSet() {
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errLog.Print(ErrInvalidConn)
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return nil, driver.ErrBadConn
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}
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// Send command
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err := mc.writeCommandPacketStr(comStmtPrepare, query)
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if err != nil {
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// STMT_PREPARE is safe to retry. So we can return ErrBadConn here.
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errLog.Print(err)
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return nil, driver.ErrBadConn
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}
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stmt := &mysqlStmt{
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mc: mc,
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}
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// Read Result
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columnCount, err := stmt.readPrepareResultPacket()
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if err == nil {
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if stmt.paramCount > 0 {
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if err = mc.readUntilEOF(); err != nil {
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return nil, err
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}
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}
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if columnCount > 0 {
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err = mc.readUntilEOF()
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}
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}
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return stmt, err
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}
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func (mc *mysqlConn) interpolateParams(query string, args []driver.Value) (string, error) {
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// Number of ? should be same to len(args)
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if strings.Count(query, "?") != len(args) {
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return "", driver.ErrSkip
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}
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buf, err := mc.buf.takeCompleteBuffer()
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if err != nil {
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// can not take the buffer. Something must be wrong with the connection
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errLog.Print(err)
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return "", ErrInvalidConn
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}
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buf = buf[:0]
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argPos := 0
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for i := 0; i < len(query); i++ {
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q := strings.IndexByte(query[i:], '?')
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if q == -1 {
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buf = append(buf, query[i:]...)
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break
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}
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buf = append(buf, query[i:i+q]...)
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i += q
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arg := args[argPos]
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argPos++
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if arg == nil {
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buf = append(buf, "NULL"...)
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continue
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}
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switch v := arg.(type) {
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case int64:
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buf = strconv.AppendInt(buf, v, 10)
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case uint64:
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// Handle uint64 explicitly because our custom ConvertValue emits unsigned values
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buf = strconv.AppendUint(buf, v, 10)
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case float64:
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buf = strconv.AppendFloat(buf, v, 'g', -1, 64)
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case bool:
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if v {
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buf = append(buf, '1')
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} else {
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buf = append(buf, '0')
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}
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case time.Time:
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if v.IsZero() {
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buf = append(buf, "'0000-00-00'"...)
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} else {
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buf = append(buf, '\'')
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buf, err = appendDateTime(buf, v.In(mc.cfg.Loc))
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if err != nil {
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return "", err
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}
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buf = append(buf, '\'')
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}
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case json.RawMessage:
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buf = append(buf, '\'')
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if mc.status&statusNoBackslashEscapes == 0 {
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buf = escapeBytesBackslash(buf, v)
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} else {
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buf = escapeBytesQuotes(buf, v)
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}
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buf = append(buf, '\'')
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case []byte:
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if v == nil {
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buf = append(buf, "NULL"...)
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} else {
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buf = append(buf, "_binary'"...)
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if mc.status&statusNoBackslashEscapes == 0 {
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buf = escapeBytesBackslash(buf, v)
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} else {
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buf = escapeBytesQuotes(buf, v)
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}
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buf = append(buf, '\'')
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}
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case string:
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buf = append(buf, '\'')
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if mc.status&statusNoBackslashEscapes == 0 {
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buf = escapeStringBackslash(buf, v)
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} else {
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buf = escapeStringQuotes(buf, v)
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}
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buf = append(buf, '\'')
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default:
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return "", driver.ErrSkip
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}
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if len(buf)+4 > mc.maxAllowedPacket {
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return "", driver.ErrSkip
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}
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}
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if argPos != len(args) {
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return "", driver.ErrSkip
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}
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return string(buf), nil
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}
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func (mc *mysqlConn) Exec(query string, args []driver.Value) (driver.Result, error) {
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if mc.closed.IsSet() {
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errLog.Print(ErrInvalidConn)
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return nil, driver.ErrBadConn
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}
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if len(args) != 0 {
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if !mc.cfg.InterpolateParams {
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return nil, driver.ErrSkip
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}
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// try to interpolate the parameters to save extra roundtrips for preparing and closing a statement
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prepared, err := mc.interpolateParams(query, args)
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if err != nil {
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return nil, err
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}
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query = prepared
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}
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mc.affectedRows = 0
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mc.insertId = 0
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err := mc.exec(query)
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if err == nil {
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return &mysqlResult{
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affectedRows: int64(mc.affectedRows),
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insertId: int64(mc.insertId),
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}, err
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}
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return nil, mc.markBadConn(err)
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}
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// Internal function to execute commands
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func (mc *mysqlConn) exec(query string) error {
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// Send command
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if err := mc.writeCommandPacketStr(comQuery, query); err != nil {
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return mc.markBadConn(err)
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}
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// Read Result
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resLen, err := mc.readResultSetHeaderPacket()
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if err != nil {
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return err
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}
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if resLen > 0 {
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// columns
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if err := mc.readUntilEOF(); err != nil {
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return err
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}
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// rows
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if err := mc.readUntilEOF(); err != nil {
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return err
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}
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}
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return mc.discardResults()
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}
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func (mc *mysqlConn) Query(query string, args []driver.Value) (driver.Rows, error) {
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return mc.query(query, args)
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}
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func (mc *mysqlConn) query(query string, args []driver.Value) (*textRows, error) {
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if mc.closed.IsSet() {
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errLog.Print(ErrInvalidConn)
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return nil, driver.ErrBadConn
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}
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if len(args) != 0 {
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if !mc.cfg.InterpolateParams {
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return nil, driver.ErrSkip
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}
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// try client-side prepare to reduce roundtrip
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prepared, err := mc.interpolateParams(query, args)
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if err != nil {
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return nil, err
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}
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query = prepared
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}
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// Send command
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err := mc.writeCommandPacketStr(comQuery, query)
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if err == nil {
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// Read Result
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var resLen int
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resLen, err = mc.readResultSetHeaderPacket()
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if err == nil {
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rows := new(textRows)
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rows.mc = mc
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if resLen == 0 {
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rows.rs.done = true
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switch err := rows.NextResultSet(); err {
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case nil, io.EOF:
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return rows, nil
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default:
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return nil, err
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}
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}
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// Columns
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rows.rs.columns, err = mc.readColumns(resLen)
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return rows, err
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}
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}
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return nil, mc.markBadConn(err)
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}
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// Gets the value of the given MySQL System Variable
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// The returned byte slice is only valid until the next read
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func (mc *mysqlConn) getSystemVar(name string) ([]byte, error) {
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// Send command
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if err := mc.writeCommandPacketStr(comQuery, "SELECT @@"+name); err != nil {
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return nil, err
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}
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|
|
|
||
|
|
// Read Result
|
||
|
|
resLen, err := mc.readResultSetHeaderPacket()
|
||
|
|
if err == nil {
|
||
|
|
rows := new(textRows)
|
||
|
|
rows.mc = mc
|
||
|
|
rows.rs.columns = []mysqlField{{fieldType: fieldTypeVarChar}}
|
||
|
|
|
||
|
|
if resLen > 0 {
|
||
|
|
// Columns
|
||
|
|
if err := mc.readUntilEOF(); err != nil {
|
||
|
|
return nil, err
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
dest := make([]driver.Value, resLen)
|
||
|
|
if err = rows.readRow(dest); err == nil {
|
||
|
|
return dest[0].([]byte), mc.readUntilEOF()
|
||
|
|
}
|
||
|
|
}
|
||
|
|
return nil, err
|
||
|
|
}
|
||
|
|
|
||
|
|
// finish is called when the query has canceled.
|
||
|
|
func (mc *mysqlConn) cancel(err error) {
|
||
|
|
mc.canceled.Set(err)
|
||
|
|
mc.cleanup()
|
||
|
|
}
|
||
|
|
|
||
|
|
// finish is called when the query has succeeded.
|
||
|
|
func (mc *mysqlConn) finish() {
|
||
|
|
if !mc.watching || mc.finished == nil {
|
||
|
|
return
|
||
|
|
}
|
||
|
|
select {
|
||
|
|
case mc.finished <- struct{}{}:
|
||
|
|
mc.watching = false
|
||
|
|
case <-mc.closech:
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
// Ping implements driver.Pinger interface
|
||
|
|
func (mc *mysqlConn) Ping(ctx context.Context) (err error) {
|
||
|
|
if mc.closed.IsSet() {
|
||
|
|
errLog.Print(ErrInvalidConn)
|
||
|
|
return driver.ErrBadConn
|
||
|
|
}
|
||
|
|
|
||
|
|
if err = mc.watchCancel(ctx); err != nil {
|
||
|
|
return
|
||
|
|
}
|
||
|
|
defer mc.finish()
|
||
|
|
|
||
|
|
if err = mc.writeCommandPacket(comPing); err != nil {
|
||
|
|
return mc.markBadConn(err)
|
||
|
|
}
|
||
|
|
|
||
|
|
return mc.readResultOK()
|
||
|
|
}
|
||
|
|
|
||
|
|
// BeginTx implements driver.ConnBeginTx interface
|
||
|
|
func (mc *mysqlConn) BeginTx(ctx context.Context, opts driver.TxOptions) (driver.Tx, error) {
|
||
|
|
if mc.closed.IsSet() {
|
||
|
|
return nil, driver.ErrBadConn
|
||
|
|
}
|
||
|
|
|
||
|
|
if err := mc.watchCancel(ctx); err != nil {
|
||
|
|
return nil, err
|
||
|
|
}
|
||
|
|
defer mc.finish()
|
||
|
|
|
||
|
|
if sql.IsolationLevel(opts.Isolation) != sql.LevelDefault {
|
||
|
|
level, err := mapIsolationLevel(opts.Isolation)
|
||
|
|
if err != nil {
|
||
|
|
return nil, err
|
||
|
|
}
|
||
|
|
err = mc.exec("SET TRANSACTION ISOLATION LEVEL " + level)
|
||
|
|
if err != nil {
|
||
|
|
return nil, err
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
return mc.begin(opts.ReadOnly)
|
||
|
|
}
|
||
|
|
|
||
|
|
func (mc *mysqlConn) QueryContext(ctx context.Context, query string, args []driver.NamedValue) (driver.Rows, error) {
|
||
|
|
dargs, err := namedValueToValue(args)
|
||
|
|
if err != nil {
|
||
|
|
return nil, err
|
||
|
|
}
|
||
|
|
|
||
|
|
if err := mc.watchCancel(ctx); err != nil {
|
||
|
|
return nil, err
|
||
|
|
}
|
||
|
|
|
||
|
|
rows, err := mc.query(query, dargs)
|
||
|
|
if err != nil {
|
||
|
|
mc.finish()
|
||
|
|
return nil, err
|
||
|
|
}
|
||
|
|
rows.finish = mc.finish
|
||
|
|
return rows, err
|
||
|
|
}
|
||
|
|
|
||
|
|
func (mc *mysqlConn) ExecContext(ctx context.Context, query string, args []driver.NamedValue) (driver.Result, error) {
|
||
|
|
dargs, err := namedValueToValue(args)
|
||
|
|
if err != nil {
|
||
|
|
return nil, err
|
||
|
|
}
|
||
|
|
|
||
|
|
if err := mc.watchCancel(ctx); err != nil {
|
||
|
|
return nil, err
|
||
|
|
}
|
||
|
|
defer mc.finish()
|
||
|
|
|
||
|
|
return mc.Exec(query, dargs)
|
||
|
|
}
|
||
|
|
|
||
|
|
func (mc *mysqlConn) PrepareContext(ctx context.Context, query string) (driver.Stmt, error) {
|
||
|
|
if err := mc.watchCancel(ctx); err != nil {
|
||
|
|
return nil, err
|
||
|
|
}
|
||
|
|
|
||
|
|
stmt, err := mc.Prepare(query)
|
||
|
|
mc.finish()
|
||
|
|
if err != nil {
|
||
|
|
return nil, err
|
||
|
|
}
|
||
|
|
|
||
|
|
select {
|
||
|
|
default:
|
||
|
|
case <-ctx.Done():
|
||
|
|
stmt.Close()
|
||
|
|
return nil, ctx.Err()
|
||
|
|
}
|
||
|
|
return stmt, nil
|
||
|
|
}
|
||
|
|
|
||
|
|
func (stmt *mysqlStmt) QueryContext(ctx context.Context, args []driver.NamedValue) (driver.Rows, error) {
|
||
|
|
dargs, err := namedValueToValue(args)
|
||
|
|
if err != nil {
|
||
|
|
return nil, err
|
||
|
|
}
|
||
|
|
|
||
|
|
if err := stmt.mc.watchCancel(ctx); err != nil {
|
||
|
|
return nil, err
|
||
|
|
}
|
||
|
|
|
||
|
|
rows, err := stmt.query(dargs)
|
||
|
|
if err != nil {
|
||
|
|
stmt.mc.finish()
|
||
|
|
return nil, err
|
||
|
|
}
|
||
|
|
rows.finish = stmt.mc.finish
|
||
|
|
return rows, err
|
||
|
|
}
|
||
|
|
|
||
|
|
func (stmt *mysqlStmt) ExecContext(ctx context.Context, args []driver.NamedValue) (driver.Result, error) {
|
||
|
|
dargs, err := namedValueToValue(args)
|
||
|
|
if err != nil {
|
||
|
|
return nil, err
|
||
|
|
}
|
||
|
|
|
||
|
|
if err := stmt.mc.watchCancel(ctx); err != nil {
|
||
|
|
return nil, err
|
||
|
|
}
|
||
|
|
defer stmt.mc.finish()
|
||
|
|
|
||
|
|
return stmt.Exec(dargs)
|
||
|
|
}
|
||
|
|
|
||
|
|
func (mc *mysqlConn) watchCancel(ctx context.Context) error {
|
||
|
|
if mc.watching {
|
||
|
|
// Reach here if canceled,
|
||
|
|
// so the connection is already invalid
|
||
|
|
mc.cleanup()
|
||
|
|
return nil
|
||
|
|
}
|
||
|
|
// When ctx is already cancelled, don't watch it.
|
||
|
|
if err := ctx.Err(); err != nil {
|
||
|
|
return err
|
||
|
|
}
|
||
|
|
// When ctx is not cancellable, don't watch it.
|
||
|
|
if ctx.Done() == nil {
|
||
|
|
return nil
|
||
|
|
}
|
||
|
|
// When watcher is not alive, can't watch it.
|
||
|
|
if mc.watcher == nil {
|
||
|
|
return nil
|
||
|
|
}
|
||
|
|
|
||
|
|
mc.watching = true
|
||
|
|
mc.watcher <- ctx
|
||
|
|
return nil
|
||
|
|
}
|
||
|
|
|
||
|
|
func (mc *mysqlConn) startWatcher() {
|
||
|
|
watcher := make(chan context.Context, 1)
|
||
|
|
mc.watcher = watcher
|
||
|
|
finished := make(chan struct{})
|
||
|
|
mc.finished = finished
|
||
|
|
go func() {
|
||
|
|
for {
|
||
|
|
var ctx context.Context
|
||
|
|
select {
|
||
|
|
case ctx = <-watcher:
|
||
|
|
case <-mc.closech:
|
||
|
|
return
|
||
|
|
}
|
||
|
|
|
||
|
|
select {
|
||
|
|
case <-ctx.Done():
|
||
|
|
mc.cancel(ctx.Err())
|
||
|
|
case <-finished:
|
||
|
|
case <-mc.closech:
|
||
|
|
return
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}()
|
||
|
|
}
|
||
|
|
|
||
|
|
func (mc *mysqlConn) CheckNamedValue(nv *driver.NamedValue) (err error) {
|
||
|
|
nv.Value, err = converter{}.ConvertValue(nv.Value)
|
||
|
|
return
|
||
|
|
}
|
||
|
|
|
||
|
|
// ResetSession implements driver.SessionResetter.
|
||
|
|
// (From Go 1.10)
|
||
|
|
func (mc *mysqlConn) ResetSession(ctx context.Context) error {
|
||
|
|
if mc.closed.IsSet() {
|
||
|
|
return driver.ErrBadConn
|
||
|
|
}
|
||
|
|
mc.reset = true
|
||
|
|
return nil
|
||
|
|
}
|
||
|
|
|
||
|
|
// IsValid implements driver.Validator interface
|
||
|
|
// (From Go 1.15)
|
||
|
|
func (mc *mysqlConn) IsValid() bool {
|
||
|
|
return !mc.closed.IsSet()
|
||
|
|
}
|