364 lines
9.2 KiB
Go
364 lines
9.2 KiB
Go
package mysql
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import (
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"fmt"
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"strings"
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"sync"
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"time"
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log "github.com/sirupsen/logrus"
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"github.com/pingcap/tidb/util/hack"
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"github.com/zr-hebo/sniffer-agent/model"
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)
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type MysqlSession struct {
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connectionID *string
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visitUser *string
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visitDB *string
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clientHost *string
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clientPort int
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serverIP *string
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serverPort int
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stmtBeginTime int64
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beginSeqID int64
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packageOffset int64
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expectReceiveSize int
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coverRanges []*jigsaw
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expectSendSize int
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prepareInfo *prepareInfo
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cachedPrepareStmt map[int][]byte
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cachedStmtBytes []byte
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computeWindowSizeCounter int
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tcpPacketCache []*model.TCPPacket
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queryPieceReceiver chan model.QueryPiece
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lastSeq int64
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closeConn chan bool
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pkgCacheLock sync.Mutex
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ignoreAckID int64
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sendSize int64
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}
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type prepareInfo struct {
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prepareStmtID int
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}
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var (
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windowSizeCache = make(map[string]*packageWindowCounter, 16)
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)
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const (
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maxIPPackageSize = 1 << 16
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)
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func NewMysqlSession(
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sessionKey *string, clientIP *string, clientPort int, serverIP *string, serverPort int,
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receiver chan model.QueryPiece) (ms *MysqlSession) {
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ms = &MysqlSession{
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connectionID: sessionKey,
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clientHost: clientIP,
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clientPort: clientPort,
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serverIP: serverIP,
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serverPort: serverPort,
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stmtBeginTime: time.Now().UnixNano() / millSecondUnit,
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cachedPrepareStmt: make(map[int][]byte, 8),
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coverRanges: make([]*jigsaw, 0, 4),
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queryPieceReceiver: receiver,
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closeConn: make(chan bool, 1),
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lastSeq: -1,
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ignoreAckID: -1,
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sendSize: 0,
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pkgCacheLock: sync.Mutex{},
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}
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return
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}
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func (ms *MysqlSession) ReceiveTCPPacket(newPkt *model.TCPPacket) {
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if newPkt == nil {
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return
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}
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if !newPkt.ToServer && ms.ignoreAckID == newPkt.Seq {
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// ignore to response to client data
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ms.ignoreAckID = ms.ignoreAckID + int64(len(newPkt.Payload))
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return
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} else if !newPkt.ToServer {
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ms.ignoreAckID = newPkt.Seq + int64(len(newPkt.Payload))
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}
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if newPkt.ToServer {
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ms.resetBeginTime()
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ms.readFromClient(newPkt.Seq, newPkt.Payload)
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} else {
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ms.readFromServer(newPkt.Payload)
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qp := ms.GenerateQueryPiece()
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if qp != nil {
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ms.queryPieceReceiver <- qp
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}
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}
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}
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func (ms *MysqlSession) resetBeginTime() {
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ms.stmtBeginTime = time.Now().UnixNano() / millSecondUnit
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}
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func (ms *MysqlSession) readFromServer(bytes []byte) {
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if ms.expectSendSize < 1 {
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ms.expectSendSize = extractMysqlPayloadSize(bytes[:4])
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contents := bytes[4:]
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if ms.prepareInfo != nil && contents[0] == 0 {
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ms.prepareInfo.prepareStmtID = bytesToInt(contents[1:5])
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}
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}
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}
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func (ms *MysqlSession) mergeRanges() {
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if len(ms.coverRanges) > 1 {
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newRange, newPkgRanges := mergeRanges(ms.coverRanges[0], ms.coverRanges[1:])
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tmpRanges := make([]*jigsaw, len(newPkgRanges)+1)
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tmpRanges[0] = newRange
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if len(newPkgRanges) > 0 {
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copy(tmpRanges[1:], newPkgRanges)
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}
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ms.coverRanges = tmpRanges
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}
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}
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func mergeRanges(currRange *jigsaw, pkgRanges []*jigsaw) (mergedRange *jigsaw, newPkgRanges []*jigsaw) {
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var nextRange *jigsaw
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newPkgRanges = make([]*jigsaw, 0, 4)
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if len(pkgRanges) < 1 {
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return currRange, newPkgRanges
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} else if len(pkgRanges) == 1 {
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nextRange = pkgRanges[0]
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} else {
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nextRange, newPkgRanges = mergeRanges(pkgRanges[0], pkgRanges[1:])
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}
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if currRange.e >= nextRange.b {
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mergedRange = &jigsaw{b: currRange.b, e: nextRange.e}
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} else {
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tmpRanges := make([]*jigsaw, len(newPkgRanges)+1)
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tmpRanges[0] = nextRange
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if len(newPkgRanges) > 0 {
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copy(tmpRanges[1:], newPkgRanges)
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}
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newPkgRanges = tmpRanges
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mergedRange = currRange
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}
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return
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}
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func (ms *MysqlSession) oneMysqlPackageFinish() bool {
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if int64(len(ms.cachedStmtBytes))%MaxMysqlPacketLen == 0 {
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return true
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}
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return false
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}
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func (ms *MysqlSession) checkFinish() bool {
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if len(ms.coverRanges) != 1 {
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ranges := make([]string, 0, len(ms.coverRanges))
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for _, cr := range ms.coverRanges {
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ranges = append(ranges, fmt.Sprintf("[%d -- %d]", cr.b, cr.e))
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}
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log.Debugf("in session %s get invalid range: %s", *ms.connectionID, strings.Join(ranges, ", "))
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return false
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}
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firstRange := ms.coverRanges[0]
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if firstRange.e-firstRange.b != int64(len(ms.cachedStmtBytes)) {
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return false
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}
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return true
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}
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func (ms *MysqlSession) readFromClient(seqID int64, bytes []byte) {
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contentSize := int64(len(bytes))
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if ms.expectReceiveSize == 0 || ms.oneMysqlPackageFinish() {
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ms.expectReceiveSize = extractMysqlPayloadSize(bytes[:4])
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ms.packageOffset = int64(len(ms.cachedStmtBytes))
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contents := bytes[4:]
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if contents[0] == ComStmtPrepare {
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ms.prepareInfo = &prepareInfo{}
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}
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contentSize = int64(len(contents))
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seqID += 4
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ms.beginSeqID = seqID
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newCache := make([]byte, ms.expectReceiveSize+len(ms.cachedStmtBytes))
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if len(ms.cachedStmtBytes) > 0 {
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copy(newCache[:len(ms.cachedStmtBytes)], ms.cachedStmtBytes)
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}
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if int64(ms.expectReceiveSize+len(ms.cachedStmtBytes)) >= ms.packageOffset+int64(len(contents)) {
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copy(newCache[ms.packageOffset:ms.packageOffset+int64(len(contents))], contents)
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ms.cachedStmtBytes = newCache
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}
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} else {
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if seqID < ms.beginSeqID {
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log.Debugf("in session %s get outdate package with Seq:%d", *ms.connectionID, seqID)
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return
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}
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seqOffset := seqID - ms.beginSeqID
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if ms.packageOffset+seqOffset+int64(len(bytes)) <= int64(ms.expectReceiveSize) {
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copy(ms.cachedStmtBytes[ms.packageOffset+seqOffset:ms.packageOffset+seqOffset+int64(len(bytes))], bytes)
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}
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}
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insertIdx := len(ms.coverRanges)
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for idx, cr := range ms.coverRanges {
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if seqID < cr.b {
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insertIdx = idx
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break
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}
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}
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cr := &jigsaw{b: seqID, e: seqID + contentSize}
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if len(ms.coverRanges) < 1 || insertIdx == len(ms.coverRanges) {
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ms.coverRanges = append(ms.coverRanges, cr)
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} else {
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newCoverRanges := make([]*jigsaw, len(ms.coverRanges)+1)
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copy(newCoverRanges[:insertIdx], ms.coverRanges[:insertIdx])
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newCoverRanges[insertIdx] = cr
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copy(newCoverRanges[insertIdx+1:], ms.coverRanges[insertIdx:])
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ms.coverRanges = newCoverRanges
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}
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ms.mergeRanges()
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}
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func (ms *MysqlSession) GenerateQueryPiece() (qp model.QueryPiece) {
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defer func() {
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ms.cachedStmtBytes = nil
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ms.expectReceiveSize = 0
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ms.expectSendSize = 0
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ms.prepareInfo = nil
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ms.coverRanges = make([]*jigsaw, 0, 4)
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ms.lastSeq = -1
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ms.ignoreAckID = -1
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ms.sendSize = 0
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}()
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if len(ms.cachedStmtBytes) < 1 {
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return
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}
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if !ms.checkFinish() {
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log.Debugf("receive a not complete cover")
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return
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}
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var mqp *model.PooledMysqlQueryPiece
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var querySQLInBytes []byte
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if ms.cachedStmtBytes[0] > 32 {
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userName, dbName, err := parseAuthInfo(ms.cachedStmtBytes)
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if err != nil {
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log.Errorf("parse auth info failed <-- %s", err.Error())
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return
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}
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ms.visitUser = &userName
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ms.visitDB = &dbName
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} else {
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switch ms.cachedStmtBytes[0] {
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case ComInitDB:
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newDBName := string(ms.cachedStmtBytes[1:])
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useSQL := fmt.Sprintf("use %s", newDBName)
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querySQLInBytes = hack.Slice(useSQL)
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mqp = ms.composeQueryPiece()
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mqp.QuerySQL = &useSQL
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// update session database
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ms.visitDB = &newDBName
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case ComDropDB:
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dbName := string(ms.cachedStmtBytes[1:])
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dropSQL := fmt.Sprintf("drop database %s", dbName)
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mqp = ms.composeQueryPiece()
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mqp.QuerySQL = &dropSQL
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case ComCreateDB, ComQuery:
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mqp = ms.composeQueryPiece()
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querySQLInBytes = ms.cachedStmtBytes[1:]
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querySQL := hack.String(querySQLInBytes)
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mqp.QuerySQL = &querySQL
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case ComStmtPrepare:
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mqp = ms.composeQueryPiece()
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querySQLInBytes = ms.cachedStmtBytes[1:]
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querySQL := hack.String(querySQLInBytes)
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mqp.QuerySQL = &querySQL
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ms.cachedPrepareStmt[ms.prepareInfo.prepareStmtID] = querySQLInBytes
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log.Debugf("prepare statement %s, get id:%d", querySQL, ms.prepareInfo.prepareStmtID)
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case ComStmtExecute:
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prepareStmtID := bytesToInt(ms.cachedStmtBytes[1:5])
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mqp = ms.composeQueryPiece()
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querySQLInBytes = ms.cachedPrepareStmt[prepareStmtID]
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querySQL := hack.String(querySQLInBytes)
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mqp.QuerySQL = &querySQL
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log.Debugf("execute prepare statement:%d", prepareStmtID)
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case ComStmtClose:
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prepareStmtID := bytesToInt(ms.cachedStmtBytes[1:5])
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delete(ms.cachedPrepareStmt, prepareStmtID)
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log.Debugf("remove prepare statement:%d", prepareStmtID)
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default:
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return
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}
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}
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if strictMode && mqp != nil && mqp.VisitUser == nil {
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user, db, err := querySessionInfo(ms.serverPort, mqp.SessionID)
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if err != nil {
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log.Errorf("query user and db from mysql failed <-- %s", err.Error())
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} else {
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mqp.VisitUser = user
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mqp.VisitDB = db
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}
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}
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return filterQueryPieceBySQL(mqp, querySQLInBytes)
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}
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func filterQueryPieceBySQL(mqp *model.PooledMysqlQueryPiece, querySQL []byte) (model.QueryPiece) {
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if mqp == nil || querySQL == nil {
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return nil
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} else if (uselessSQLPattern.Match(querySQL)) {
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return nil
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}
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if ddlPatern.Match(querySQL) {
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mqp.SetNeedSyncSend(true)
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}
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return mqp
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}
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func (ms *MysqlSession) composeQueryPiece() (mqp *model.PooledMysqlQueryPiece) {
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return model.NewPooledMysqlQueryPiece(
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ms.connectionID, ms.clientHost, ms.visitUser, ms.visitDB, ms.clientHost, ms.serverIP,
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ms.clientPort, ms.serverPort, ms.stmtBeginTime)
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}
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