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event.go
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event.go
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/*
Copyright 2018 liipx(lipengxiang)
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
package binlog
import (
"bytes"
"encoding/binary"
"fmt"
"strings"
"time"
)
// BinEventBody describe event body
type BinEventBody interface {
isEventBody()
}
// BinEvent binary log event definition
type BinEvent struct {
Header *BinEventHeader
Body BinEventBody
ChecksumType byte
ChecksumVal []byte
}
// Validation event validity check
func (event *BinEvent) Validation(bin *BinaryLogInfo, header, body []byte) ([]byte, error) {
if bin == nil {
return body, fmt.Errorf("empty BinaryLogInfo")
}
if event.Header == nil {
return body, fmt.Errorf("empty event header")
}
if l := int64(len(body) + len(header)); l != event.Header.EventSize {
return body, fmt.Errorf("event size got %d need %d", l, event.Header.EventSize)
}
if bin.description != nil && bin.description.hasCheckSum {
index := len(body) - binlogChecksumLength - 1
event.ChecksumType = body[index]
event.ChecksumVal = body[index+1:]
body = body[:index+1]
if !ChecksumValidate(event.ChecksumType, event.ChecksumVal, append(header, body...)) || len(event.ChecksumVal) != 4 {
return body, fmt.Errorf("binlog checksum validation failed")
}
}
return body, nil
}
// BaseEventBody is base off all events
type BaseEventBody struct{}
func (event *BaseEventBody) isEventBody() {}
// BinEventUnParsed save the event data when the event type not supported yet.
type BinEventUnParsed struct {
BaseEventBody
Data []byte
}
func decodeUnSupportEvent(data []byte) (*BinEventUnParsed, error) {
return &BinEventUnParsed{
Data: data,
}, nil
}
// mysql binlog version > 1 (version > mysql 4.0.0), size = 19
var defaultEventHeaderSize int64 = 19
// BinEventHeader binary log header definition
// https://dev.mysql.com/doc/internals/en/binlog-event-header.html
type BinEventHeader struct {
Timestamp int64
EventType uint8
ServerID int64
EventSize int64
LogPos int64
Flag uint16
}
// Type function will translate event type into string
func (header *BinEventHeader) Type() string {
return EventType2Str[header.EventType]
}
// String interface implement
func (header *BinEventHeader) String() string {
return fmt.Sprintf("Type:%s, Time:%s, ServerID:%d, EventSize:%d, EventEndPos:%d, Flag:0x%x",
header.Type(),
time.Unix(header.Timestamp, 0),
header.Timestamp,
header.EventSize,
header.LogPos,
header.Flag,
)
}
func decodeEventHeader(data []byte, size int64) (*BinEventHeader, error) {
if l := len(data); int64(l) < size {
return nil, fmt.Errorf("invalid event header size %d, should be %d", l, size)
}
var pos int
eventHeader := &BinEventHeader{}
// timestamp
eventHeader.Timestamp = int64(binary.LittleEndian.Uint32(data[pos:]))
pos += 4
// event_type
eventHeader.EventType = data[pos]
pos++
// serverId
eventHeader.ServerID = int64(binary.LittleEndian.Uint32(data[pos:]))
pos += 4
// event_size
eventHeader.EventSize = int64(binary.LittleEndian.Uint32(data[pos:]))
pos += 4
// version > 2
if size > 13 {
// log_pos
eventHeader.LogPos = int64(binary.LittleEndian.Uint32(data[pos:]))
pos += 4
// flags
eventHeader.Flag = binary.LittleEndian.Uint16(data[pos:])
}
return eventHeader, nil
}
// BinFmtDescEvent is the definition of FORMAT_DESCRIPTION_EVENT
// https://dev.mysql.com/doc/internals/en/format-description-event.html
type BinFmtDescEvent struct {
BaseEventBody
BinlogVersion int
MySQLVersion string
CreateTime int64
EventHeaderLength int64
EventTypeHeader []byte
// cache the result of hasCheckSum()
hasCheckSum bool
}
func decodeFmtDescEvent(data []byte) (*BinFmtDescEvent, error) {
var pos int
desc := &BinFmtDescEvent{}
// binlog-version
desc.BinlogVersion = int(binary.LittleEndian.Uint16(data))
pos += 2
// mysql-server version
desc.MySQLVersion = string(bytes.Trim(data[pos:pos+50], string(0x00)))
desc.hasCheckSum = hasChecksum(desc.MySQLVersion)
pos += 50
// create timestamp
desc.CreateTime = int64(binary.LittleEndian.Uint32(data[pos:]))
pos += 4
// event header length
desc.EventHeaderLength = int64(data[pos])
pos++
// event type header lengths
desc.EventTypeHeader = data[pos:]
return desc, nil
}
// BinQueryEvent is the definition of QUERY_EVENT
// https://dev.mysql.com/doc/internals/en/query-event.html
type BinQueryEvent struct {
BaseEventBody
SlaveProxyID int64
ExecutionTime int64
ErrorCode uint16
statusVarsLength int
StatusVars []byte
Schema string
Query string
}
func decodeQueryEvent(data []byte, binlogVersion int) (*BinQueryEvent, error) {
var pos int
event := &BinQueryEvent{}
// slave_proxy_id
event.SlaveProxyID = int64(binary.LittleEndian.Uint32(data[pos:]))
pos += 4
// execution time
event.ExecutionTime = int64(binary.LittleEndian.Uint32(data[pos:]))
pos += 4
// schema length
schemaLength := int(uint8(data[pos]))
pos++
// error-code
event.ErrorCode = binary.LittleEndian.Uint16(data[pos:])
pos += 2
if binlogVersion >= 4 {
// status-vars length
event.statusVarsLength = int(binary.LittleEndian.Uint16(data[pos:]))
pos += 2
// status-vars
event.StatusVars = data[pos : pos+event.statusVarsLength]
pos += event.statusVarsLength
}
// schema
event.Schema = string(data[pos : pos+schemaLength])
pos += schemaLength
// ignore 0x00
pos++
// query
event.Query = string(data[pos:])
return event, nil
}
// Statue will format status_vars of QUERY_EVENT
// TODO decode QUERY_EVENT status_var
func (event *BinQueryEvent) Statue() error {
fmt.Println(event.statusVarsLength)
for i := 0; i < event.statusVarsLength; {
// got status_vars key
k := event.StatusVars[i]
i++
// decode values
switch k {
case QFlags2Code:
v := event.StatusVars[i : i+4]
i += 4
// TODO
fmt.Println("QFlags2Code", v)
case QSQLModeCode:
v := event.StatusVars[i : i+8]
i += 8
// TODO
fmt.Println("QSQLModeCode", v)
case QCatalog:
n := int(event.StatusVars[i])
v := string(event.StatusVars[i+1 : i+1+n])
i += 1 + n + 1
// TODO
fmt.Println("QCatalog", v)
case QAutoIncrement:
increment := binary.LittleEndian.Uint32(event.StatusVars[i:])
offset := binary.LittleEndian.Uint32(event.StatusVars[i+2:])
// TODO
fmt.Printf("QAutoIncrement %d, %d\n", increment, offset)
case QCharsetCode:
clientCharSet := event.StatusVars[i : i+2]
i += 2
collationConnection := event.StatusVars[i : i+2]
i += 2
collationServer := event.StatusVars[i : i+2]
i += 2
// TODO
fmt.Println("QCharsetCode", clientCharSet, collationConnection, collationServer)
case QTimeZoneCode:
n := int(event.StatusVars[i])
v := string(event.StatusVars[i+1 : i+1+n])
i += 1 + n
// TODO
fmt.Println("QTimeZoneCode", v)
case QCatalogNZCode:
n := int(event.StatusVars[i])
v := string(event.StatusVars[i+1 : i+1+n])
i += 1 + n
// TODO
fmt.Printf("QCatalogNZCode %s\n", v)
case QLCTimeNamesCode:
// TODO
fmt.Println("QLCTimeNamesCode")
case QCharsetDatabaseCode:
// TODO
fmt.Println("QCharsetDatabaseCode")
case QTableMapForUpdateCode:
// TODO
fmt.Println("QTableMapForUpdateCode")
case QMasterDataWrittenCode:
// TODO
fmt.Println("QMasterDataWrittenCode")
case QInvokers:
// TODO
fmt.Println("QInvokers")
case QUpdatedDBNames:
// TODO
fmt.Println("QUpdatedDBNames")
case QMicroseconds:
microseconds := binary.LittleEndian.Uint32(event.StatusVars[i:])
i += 3
// TODO
fmt.Printf("QMicroseconds %d\n", microseconds)
default:
return fmt.Errorf("unknown status var %x", k)
}
}
return nil
}
// BinXIDEvent is the definition of XID_EVENT
// https://dev.mysql.com/doc/internals/en/xid-event.html
// Transaction ID for 2PC, written whenever a COMMIT is expected.
type BinXIDEvent struct {
BaseEventBody
XID uint64
}
func decodeXIDEvent(data []byte) (*BinXIDEvent, error) {
return &BinXIDEvent{
XID: binary.LittleEndian.Uint64(data),
}, nil
}
// BinIntvarEvent is the definition of INTVAR_EVENT
// https://dev.mysql.com/doc/internals/en/xid-event.html
// Transaction ID for 2PC, written whenever a COMMIT is expected.
type BinIntvarEvent struct {
BaseEventBody
Type uint8
Value uint64
}
func decodeIntvarEvent(data []byte) (*BinIntvarEvent, error) {
return &BinIntvarEvent{
Type: data[0],
Value: binary.LittleEndian.Uint64(data[1:]),
}, nil
}
// TODO: BinIntvarEvent.Type format
// BinRotateEvent is the definition of ROTATE_EVENT
// https://dev.mysql.com/doc/internals/en/rotate-event.html
// The rotate event is added to the binlog as last event to tell the reader what binlog to request next.
type BinRotateEvent struct {
BaseEventBody
Position uint64
FileName string
}
func decodeRotateEvent(data []byte, binlogVersion int) (*BinRotateEvent, error) {
event := &BinRotateEvent{}
var pos int
if binlogVersion > 1 {
event.Position = binary.LittleEndian.Uint64(data)
pos += 8
}
event.FileName = strings.TrimSpace(string(data[pos:]))
return event, nil
}
// BinPreGTIDsEvent is the definition of PREVIOUS_GTIDS_EVENT
// TODO: PREVIOUS_GTIDS_EVENT
type BinPreGTIDsEvent struct{ BaseEventBody }