334 lines
8.3 KiB
Go
334 lines
8.3 KiB
Go
package mysql
|
|
|
|
import (
|
|
"fmt"
|
|
"time"
|
|
|
|
"github.com/siddontang/go/hack"
|
|
log "github.com/sirupsen/logrus"
|
|
"github.com/zr-hebo/sniffer-agent/model"
|
|
)
|
|
|
|
type MysqlSession struct {
|
|
connectionID *string
|
|
visitUser *string
|
|
visitDB *string
|
|
clientHost *string
|
|
clientPort int
|
|
serverIP *string
|
|
serverPort int
|
|
stmtBeginTime int64
|
|
beginSeqID int64
|
|
packageOffset int64
|
|
expectReceiveSize int
|
|
coverRanges []*jigsaw
|
|
tcpWindowSize int
|
|
expectSendSize int
|
|
prepareInfo *prepareInfo
|
|
sizeCount map[int]int64
|
|
cachedPrepareStmt map[int]*string
|
|
cachedStmtBytes []byte
|
|
computeWindowSizeCounter int
|
|
}
|
|
|
|
type prepareInfo struct {
|
|
prepareStmtID int
|
|
}
|
|
|
|
const (
|
|
defaultCacheSize = 1 << 16
|
|
maxIPPackageSize = 1 << 16
|
|
)
|
|
|
|
func NewMysqlSession(sessionKey *string, clientIP *string, clientPort int, serverIP *string, serverPort int) (ms *MysqlSession) {
|
|
ms = &MysqlSession{
|
|
connectionID: sessionKey,
|
|
clientHost: clientIP,
|
|
clientPort: clientPort,
|
|
serverIP: serverIP,
|
|
serverPort: serverPort,
|
|
stmtBeginTime: time.Now().UnixNano() / millSecondUnit,
|
|
cachedPrepareStmt: make(map[int]*string, 8),
|
|
}
|
|
ms.tcpWindowSize = 512
|
|
ms.coverRanges = make([]*jigsaw, 0, 4)
|
|
ms.sizeCount = make(map[int]int64)
|
|
|
|
return
|
|
}
|
|
|
|
func (ms *MysqlSession) ResetBeginTime() {
|
|
ms.stmtBeginTime = time.Now().UnixNano() / millSecondUnit
|
|
}
|
|
|
|
func (ms *MysqlSession) ReadFromServer(bytes []byte) {
|
|
if ms.expectSendSize < 1 {
|
|
ms.expectSendSize = extractMysqlPayloadSize(bytes[:4])
|
|
contents := bytes[4:]
|
|
if ms.prepareInfo != nil && contents[0] == 0 {
|
|
ms.prepareInfo.prepareStmtID = bytesToInt(contents[1:5])
|
|
}
|
|
}
|
|
}
|
|
|
|
func (ms *MysqlSession) mergeRanges() {
|
|
if len(ms.coverRanges) > 1 {
|
|
newRange, newPkgRanges := mergeRanges(ms.coverRanges[0], ms.coverRanges[1:])
|
|
newPkgRanges = append(newPkgRanges, newRange)
|
|
ms.coverRanges = newPkgRanges
|
|
}
|
|
}
|
|
|
|
func mergeRanges(currRange *jigsaw, pkgRanges []*jigsaw) (mergedRange *jigsaw, newPkgRanges []*jigsaw) {
|
|
var nextRange *jigsaw
|
|
if len(pkgRanges) < 1 {
|
|
return currRange, make([]*jigsaw, 0)
|
|
|
|
} else if len(pkgRanges) == 1 {
|
|
nextRange = pkgRanges[0]
|
|
newPkgRanges = make([]*jigsaw, 0, 4)
|
|
|
|
} else {
|
|
nextRange, newPkgRanges = mergeRanges(pkgRanges[0], pkgRanges[1:])
|
|
}
|
|
|
|
if currRange.e >= nextRange.b {
|
|
mergedRange = &jigsaw{b: currRange.b, e: nextRange.e}
|
|
|
|
} else {
|
|
newPkgRanges = append(newPkgRanges, nextRange)
|
|
mergedRange = currRange
|
|
}
|
|
return
|
|
}
|
|
|
|
func (ms *MysqlSession) oneMysqlPackageFinish() bool {
|
|
if int64(len(ms.cachedStmtBytes)) % MaxMysqlPacketLen == 0 {
|
|
return true
|
|
}
|
|
|
|
return false
|
|
}
|
|
|
|
func (ms *MysqlSession) checkFinish() bool {
|
|
if len(ms.coverRanges) != 1 {
|
|
return true
|
|
}
|
|
|
|
firstRange := ms.coverRanges[0]
|
|
if firstRange.e - firstRange.b != int64(len(ms.cachedStmtBytes)) {
|
|
return false
|
|
}
|
|
|
|
return true
|
|
}
|
|
|
|
func (ms *MysqlSession) ReadFromClient(seqID int64, bytes []byte) {
|
|
readSize := len(bytes)
|
|
contentSize := int64(len(bytes))
|
|
|
|
if ms.expectReceiveSize == 0 || ms.oneMysqlPackageFinish() {
|
|
ms.expectReceiveSize = extractMysqlPayloadSize(bytes[:4])
|
|
ms.packageOffset = int64(len(ms.cachedStmtBytes))
|
|
|
|
contents := bytes[4:]
|
|
if contents[0] == ComStmtPrepare {
|
|
ms.prepareInfo = &prepareInfo{}
|
|
}
|
|
|
|
contentSize = int64(len(contents))
|
|
seqID += 4
|
|
ms.beginSeqID = seqID
|
|
newCache := make([]byte, ms.expectReceiveSize+len(ms.cachedStmtBytes))
|
|
if len(ms.cachedStmtBytes) > 0 {
|
|
copy(newCache[:len(ms.cachedStmtBytes)], ms.cachedStmtBytes)
|
|
}
|
|
copy(newCache[ms.packageOffset:ms.packageOffset+int64(len(contents))], contents)
|
|
ms.cachedStmtBytes = newCache
|
|
|
|
} else {
|
|
if seqID < ms.beginSeqID {
|
|
log.Debugf("outdate package with Seq:%d", seqID)
|
|
return
|
|
}
|
|
|
|
seqOffset := seqID - ms.beginSeqID
|
|
if ms.packageOffset+seqOffset+int64(len(bytes)) <= int64(ms.expectReceiveSize) {
|
|
copy(ms.cachedStmtBytes[ms.packageOffset+seqOffset:ms.packageOffset+seqOffset+int64(len(bytes))], bytes)
|
|
}
|
|
}
|
|
|
|
ms.refreshWindowSize(readSize)
|
|
|
|
insertIdx := len(ms.coverRanges)
|
|
for idx, cr := range ms.coverRanges {
|
|
if seqID < cr.b {
|
|
insertIdx = idx
|
|
break
|
|
}
|
|
}
|
|
|
|
cr := &jigsaw{b: seqID, e: seqID+int64(contentSize)}
|
|
if insertIdx == len(ms.coverRanges) - 1 {
|
|
ms.coverRanges = append(ms.coverRanges, cr)
|
|
|
|
} else {
|
|
newCoverRanges := make([]*jigsaw, len(ms.coverRanges)+1)
|
|
copy(newCoverRanges[:insertIdx], ms.coverRanges[:insertIdx])
|
|
newCoverRanges[insertIdx] = cr
|
|
copy(newCoverRanges[insertIdx+1:], ms.coverRanges[insertIdx:])
|
|
ms.coverRanges = newCoverRanges
|
|
}
|
|
ms.mergeRanges()
|
|
|
|
}
|
|
|
|
func (ms *MysqlSession) refreshWindowSize(readSize int) {
|
|
if ms.computeWindowSizeCounter > 5000 {
|
|
return
|
|
}
|
|
|
|
log.Debugf("sizeCount: %#v", ms.sizeCount)
|
|
|
|
ms.computeWindowSizeCounter += 1
|
|
miniMatchSize := maxIPPackageSize
|
|
for size := range ms.sizeCount {
|
|
if readSize % size == 0 && miniMatchSize > size {
|
|
miniMatchSize = size
|
|
}
|
|
}
|
|
if miniMatchSize < maxIPPackageSize {
|
|
ms.sizeCount[miniMatchSize] = ms.sizeCount[miniMatchSize] + 1
|
|
} else if ms.checkFinish() {
|
|
ms.sizeCount[readSize] = 1
|
|
}
|
|
|
|
mostFrequentSize := ms.tcpWindowSize
|
|
miniSize := ms.tcpWindowSize
|
|
mostFrequentCount := int64(0)
|
|
for size, count := range ms.sizeCount {
|
|
if count > mostFrequentCount {
|
|
mostFrequentSize = size
|
|
mostFrequentCount = count
|
|
}
|
|
|
|
if miniSize > size {
|
|
miniSize = size
|
|
}
|
|
}
|
|
|
|
ms.tcpWindowSize = mostFrequentSize
|
|
}
|
|
|
|
|
|
func (ms *MysqlSession) GenerateQueryPiece() (qp model.QueryPiece) {
|
|
defer func() {
|
|
// ms.tcpCache = ms.tcpCache[0:0]
|
|
ms.cachedStmtBytes = nil
|
|
ms.expectReceiveSize = 0
|
|
ms.expectSendSize = 0
|
|
ms.prepareInfo = nil
|
|
ms.coverRanges = make([]*jigsaw, 0, 4)
|
|
// ms.packageComplete = false
|
|
}()
|
|
|
|
if len(ms.cachedStmtBytes) < 1 {
|
|
return
|
|
}
|
|
|
|
// fmt.Printf("packageComplete in generate: %v\n", ms.packageComplete)
|
|
if !ms.checkFinish() {
|
|
log.Errorf("is not a complete cover")
|
|
return
|
|
}
|
|
|
|
var mqp *model.PooledMysqlQueryPiece
|
|
var querySQLInBytes []byte
|
|
switch ms.cachedStmtBytes[0] {
|
|
case ComAuth:
|
|
var userName, dbName string
|
|
var err error
|
|
userName, dbName, err = parseAuthInfo(ms.cachedStmtBytes)
|
|
if err != nil {
|
|
log.Errorf("parse auth info failed <-- %s", err.Error())
|
|
}
|
|
ms.visitUser = &userName
|
|
ms.visitDB = &dbName
|
|
|
|
case ComInitDB:
|
|
newDBName := string(ms.cachedStmtBytes[1:])
|
|
useSQL := fmt.Sprintf("use %s", newDBName)
|
|
mqp = ms.composeQueryPiece()
|
|
mqp.QuerySQL = &useSQL
|
|
// update session database
|
|
ms.visitDB = &newDBName
|
|
|
|
case ComDropDB:
|
|
dbName := string(ms.cachedStmtBytes[1:])
|
|
dropSQL := fmt.Sprintf("drop database %s", dbName)
|
|
mqp = ms.composeQueryPiece()
|
|
mqp.QuerySQL = &dropSQL
|
|
|
|
case ComCreateDB, ComQuery:
|
|
mqp = ms.composeQueryPiece()
|
|
querySQLInBytes = ms.cachedStmtBytes[1:]
|
|
querySQL := hack.String(querySQLInBytes)
|
|
mqp.QuerySQL = &querySQL
|
|
|
|
case ComStmtPrepare:
|
|
mqp = ms.composeQueryPiece()
|
|
querySQLInBytes = ms.cachedStmtBytes[1:]
|
|
querySQL := hack.String(querySQLInBytes)
|
|
mqp.QuerySQL = &querySQL
|
|
ms.cachedPrepareStmt[ms.prepareInfo.prepareStmtID] = &querySQL
|
|
log.Debugf("prepare statement %s, get id:%d", querySQL, ms.prepareInfo.prepareStmtID)
|
|
|
|
case ComStmtExecute:
|
|
prepareStmtID := bytesToInt(ms.cachedStmtBytes[1:5])
|
|
mqp = ms.composeQueryPiece()
|
|
mqp.QuerySQL = ms.cachedPrepareStmt[prepareStmtID]
|
|
log.Debugf("execute prepare statement:%d", prepareStmtID)
|
|
|
|
case ComStmtClose:
|
|
prepareStmtID := bytesToInt(ms.cachedStmtBytes[1:5])
|
|
delete(ms.cachedPrepareStmt, prepareStmtID)
|
|
log.Debugf("remove prepare statement:%d", prepareStmtID)
|
|
|
|
default:
|
|
return
|
|
}
|
|
|
|
if strictMode && mqp != nil && mqp.VisitUser == nil {
|
|
user, db, err := querySessionInfo(ms.serverPort, mqp.SessionID)
|
|
if err != nil {
|
|
log.Errorf("query user and db from mysql failed <-- %s", err.Error())
|
|
} else {
|
|
mqp.VisitUser = user
|
|
mqp.VisitDB = db
|
|
}
|
|
}
|
|
|
|
return filterQueryPieceBySQL(mqp, querySQLInBytes)
|
|
}
|
|
|
|
func filterQueryPieceBySQL(mqp *model.PooledMysqlQueryPiece, querySQL []byte) (model.QueryPiece) {
|
|
if mqp == nil || querySQL == nil {
|
|
return nil
|
|
|
|
} else if (uselessSQLPattern.Match(querySQL)) {
|
|
return nil
|
|
}
|
|
|
|
if ddlPatern.Match(querySQL) {
|
|
mqp.SetNeedSyncSend(true)
|
|
}
|
|
|
|
// log.Debug(mqp.String())
|
|
return mqp
|
|
}
|
|
|
|
func (ms *MysqlSession) composeQueryPiece() (mqp *model.PooledMysqlQueryPiece) {
|
|
return model.NewPooledMysqlQueryPiece(
|
|
ms.connectionID, ms.visitUser, ms.visitDB, ms.clientHost, ms.serverIP, ms.serverPort, ms.stmtBeginTime)
|
|
}
|