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execute.go
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execute.go
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package prepared
import (
"errors"
"github.com/light-pan/sharingan/replayer-agent/utils/protocol/pmysql/common"
"github.com/modern-go/parse"
"github.com/modern-go/parse/model"
)
// StmtExecuteBody client发起执行stmt的packet
// 由于解析过于复杂,这期先不做
type StmtExecuteBody struct {
StatementID int
Flag byte
ExtraBytes []byte
}
func (s *StmtExecuteBody) String() string {
data, err := json.Marshal(s)
if nil != err {
return err.Error()
}
return string(data)
}
// Map ...
func (s *StmtExecuteBody) Map() model.Map {
r := make(model.Map)
r["statement_id"] = s.StatementID
r["flag"] = s.Flag
r["extra_bytes"] = s.ExtraBytes
return r
}
var (
errNoStmtExecutePacket = errors.New("not stmt execute packet")
)
// DecodeStmtExecutePacket 解码stmt execute包
// 解析过于复杂,这期先不做
// doc: https://dev.mysql.com/doc/internals/en/com-stmt-execute.html
func DecodeStmtExecutePacket(src *parse.Source) (*StmtExecuteBody, error) {
pkLen, _ := common.GetPacketHeader(src)
if src.Error() != nil {
return nil, src.Error()
}
if !src.Expect1(0x17) {
return nil, errNoStmtExecutePacket
}
resp := new(StmtExecuteBody)
var err error
resp.StatementID, err = common.GetIntN(src.ReadN(4), 4)
if nil != err {
return nil, err
}
resp.Flag = src.Read1()
if resp.Flag > 0x04 {
return nil, errNoPrepareResponsePacket
}
// The iteration-count(4 bytes) is always 1
if !src.Expect1(1) {
return nil, errNoPrepareResponsePacket
}
for i := 0; i < 3; i++ {
if !src.Expect1(0) {
return nil, errNoStmtExecutePacket
}
}
// ---
resp.ExtraBytes = src.ReadN(pkLen - 10)
return resp, src.Error()
}