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query.go
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query.go
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package command
import (
"errors"
"github.com/didi/sharingan/replayer-agent/utils/protocol/pmysql/common"
"github.com/modern-go/parse"
"github.com/modern-go/parse/model"
)
// QueryBody query body
type QueryBody struct {
RawBody string
}
func (q *QueryBody) String() string {
data, err := json.Marshal(q)
if nil != err {
return err.Error()
}
return string(data)
}
// Map 把self转成一个model.Map对象
func (q *QueryBody) Map() model.Map {
r := make(model.Map)
r["sql"] = q.RawBody
return r
}
// DecodeQueryReq 解码query请求
// doc: https://dev.mysql.com/doc/internals/en/com-query.html
func DecodeQueryReq(src *parse.Source) (*QueryBody, error) {
pkLen, _ := common.GetPacketHeader(src)
b := src.Read1()
if b != 0x03 {
return nil, errors.New("packet isn't a query request")
}
return &QueryBody{RawBody: string(src.ReadN(pkLen - 1))}, nil
}
// ResultSet query的返回结果集
type ResultSet struct {
Columns []Columndef
DataSet [][]string
}
func (rs *ResultSet) String() string {
data, err := json.Marshal(rs)
if nil != err {
return err.Error()
}
return string(data)
}
// Map 把self转成一个model.Map对象
func (rs *ResultSet) Map() model.Map {
r := make(model.Map)
list := make(model.List, 0, len(rs.Columns))
for _, col := range rs.Columns {
list = append(list, col.Map())
}
r["columns"] = list
dataset := make(model.List, 0, len(rs.DataSet))
for _, set := range rs.DataSet {
dataset = append(dataset, set)
}
r["rows"] = list
return r
}
// Columndef table的一个字段的定义
type Columndef struct {
// 0x03 def
Schema string
Table string
OrgTable string
ColName string
OrgColName string
// next_length always 0x0c
Charset uint16 // 2bytes
ColLength int // int<4>
Type byte
ExtraBytes []byte
}
// Map 把self转成一个model.Map对象
func (colDef *Columndef) Map() model.Map {
r := make(model.Map)
r["schema"] = colDef.Schema
r["table"] = colDef.Table
r["origin_table"] = colDef.OrgTable
r["column_name"] = colDef.ColName
r["origin_column_name"] = colDef.OrgColName
r["charset"] = colDef.Charset
r["column_length"] = colDef.ColLength
r["type"] = colDef.Type
r["extra_bytes"] = colDef.ExtraBytes
return r
}
// DecodeResultSet 解码resultset包
// doc: https://dev.mysql.com/doc/internals/en/com-query-response.html#packet-ProtocolText::Resultset
func DecodeResultSet(src *parse.Source) (*ResultSet, error) {
pkLen, _ := common.GetPacketHeader(src)
if src.Error() != nil {
return nil, src.Error()
}
colNum, _, err := common.GetIntLenc(src.ReadN(pkLen))
if nil != err {
return nil, err
}
if colNum == 0 {
return nil, errNoResultSetPacket
}
if src.Error() != nil {
return nil, src.Error()
}
resultSet := &ResultSet{}
for i := 0; i < colNum; i++ {
field, err := DecodeColumnDef(src)
if nil != err {
return nil, err
}
resultSet.Columns = append(resultSet.Columns, field)
}
for src.Error() == nil && !common.IsEOFPacket(src) {
dataSet, err := decodeDataset(src)
if nil != err {
return nil, err
}
resultSet.DataSet = append(resultSet.DataSet, dataSet)
}
if src.Error() != nil {
return nil, src.Error()
}
common.ReadEOFPacket(src)
// -- should end
src.Peek1()
// if there's more bytes, this isn't resultset packet
if src.Error() == nil {
return nil, errNoResultSetPacket
} else {
return resultSet, nil
}
}
const nullStr = "NULL"
func decodeDataset(src *parse.Source) ([]string, error) {
pkLen, _ := common.GetPacketHeader(src)
if src.Error() != nil {
return nil, src.Error()
}
var dataSet []string
consumed := 0
for consumed < pkLen {
b := src.Peek1()
if src.Error() != nil {
return nil, src.Error()
}
if b == common.NULL {
src.Read1()
consumed++
dataSet = append(dataSet, nullStr)
continue
}
val := common.GetLenencString(src)
if src.Error() != nil {
return nil, src.Error()
}
dataSet = append(dataSet, val)
consumed += common.GetLenencStringLength(val)
}
return dataSet, nil
}
// DecodeColumnDef 解码column定义
func DecodeColumnDef(src *parse.Source) (Columndef, error) {
common.GetPacketHeader(src)
if src.Error() != nil {
return Columndef{}, src.Error()
}
// 03 def
src.ReadN(4)
if src.Error() != nil {
return Columndef{}, src.Error()
}
schema := common.GetLenencString(src)
if src.Error() != nil {
return Columndef{}, src.Error()
}
table := common.GetLenencString(src)
if src.Error() != nil {
return Columndef{}, src.Error()
}
orgTable := common.GetLenencString(src)
if src.Error() != nil {
return Columndef{}, src.Error()
}
colName := common.GetLenencString(src)
if src.Error() != nil {
return Columndef{}, src.Error()
}
orgColName := common.GetLenencString(src)
if src.Error() != nil {
return Columndef{}, src.Error()
}
// 0x0c
src.Read1()
if src.Error() != nil {
return Columndef{}, src.Error()
}
charset, err := common.GetIntN(src.ReadN(2), 2)
if nil != err {
return Columndef{}, err
}
colLen, err := common.GetIntN(src.ReadN(4), 4)
if nil != err {
return Columndef{}, err
}
dataType := src.Read1()
if src.Error() != nil {
return Columndef{}, src.Error()
}
// flags 2 + decimals 1 + filter 2(0x00 0x00)
extraBytes := src.ReadN(5)
if src.Error() != nil {
return Columndef{}, src.Error()
}
return Columndef{
Schema: schema,
Table: table,
OrgTable: orgTable,
ColName: colName,
OrgColName: orgColName,
Charset: uint16(charset),
ColLength: colLen,
Type: dataType,
ExtraBytes: extraBytes,
}, nil
}
var (
errNoResultSetPacket = errors.New("not resultset packet")
)