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event_streamer.go
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event_streamer.go
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// Copyright 2012, Google Inc. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package binlog
import (
"encoding/base64"
"fmt"
"strconv"
"strings"
log "github.com/golang/glog"
mproto "github.com/youtube/vitess/go/mysql/proto"
"github.com/youtube/vitess/go/sqltypes"
"github.com/youtube/vitess/go/sync2"
"github.com/youtube/vitess/go/vt/binlog/proto"
"github.com/youtube/vitess/go/vt/mysqlctl"
myproto "github.com/youtube/vitess/go/vt/mysqlctl/proto"
"github.com/youtube/vitess/go/vt/sqlparser"
)
var (
binlogSetInsertID = "SET INSERT_ID="
binlogSetInsertIDLen = len(binlogSetInsertID)
streamCommentStart = "/* _stream "
streamCommentStartLen = len(streamCommentStart)
)
type sendEventFunc func(event *proto.StreamEvent) error
// EventStreamer is an adapter on top of a BinlogStreamer that convert
// the events into StreamEvent objects.
type EventStreamer struct {
bls *BinlogStreamer
sendEvent sendEventFunc
}
// NewEventStreamer returns a new EventStreamer on top of a BinlogStreamer
func NewEventStreamer(dbname string, mysqld mysqlctl.MysqlDaemon, startPos myproto.ReplicationPosition, sendEvent sendEventFunc) *EventStreamer {
evs := &EventStreamer{
sendEvent: sendEvent,
}
evs.bls = NewBinlogStreamer(dbname, mysqld, nil, startPos, evs.transactionToEvent)
return evs
}
// Stream starts streaming updates
func (evs *EventStreamer) Stream(ctx *sync2.ServiceContext) error {
return evs.bls.Stream(ctx)
}
func (evs *EventStreamer) transactionToEvent(trans *proto.BinlogTransaction) error {
var err error
var insertid int64
for _, stmt := range trans.Statements {
switch stmt.Category {
case proto.BL_SET:
if strings.HasPrefix(stmt.Sql, binlogSetInsertID) {
insertid, err = strconv.ParseInt(stmt.Sql[binlogSetInsertIDLen:], 10, 64)
if err != nil {
binlogStreamerErrors.Add("EventStreamer", 1)
log.Errorf("%v: %s", err, stmt.Sql)
}
}
case proto.BL_DML:
var dmlEvent *proto.StreamEvent
dmlEvent, insertid, err = evs.buildDMLEvent(stmt.Sql, insertid)
if err != nil {
dmlEvent = &proto.StreamEvent{
Category: "ERR",
Sql: stmt.Sql,
}
}
dmlEvent.Timestamp = trans.Timestamp
if err = evs.sendEvent(dmlEvent); err != nil {
return err
}
case proto.BL_DDL:
ddlEvent := &proto.StreamEvent{
Category: "DDL",
Sql: stmt.Sql,
Timestamp: trans.Timestamp,
}
if err = evs.sendEvent(ddlEvent); err != nil {
return err
}
case proto.BL_UNRECOGNIZED:
unrecognized := &proto.StreamEvent{
Category: "ERR",
Sql: stmt.Sql,
Timestamp: trans.Timestamp,
}
if err = evs.sendEvent(unrecognized); err != nil {
return err
}
default:
binlogStreamerErrors.Add("EventStreamer", 1)
log.Errorf("Unrecognized event: %v: %s", stmt.Category, stmt.Sql)
}
}
posEvent := &proto.StreamEvent{
Category: "POS",
TransactionID: trans.TransactionID,
Timestamp: trans.Timestamp,
}
if err = evs.sendEvent(posEvent); err != nil {
return err
}
return nil
}
/*
buildDMLEvent parses the tuples of the full stream comment.
The _stream comment is extracted into a StreamEvent.
*/
// Example query: insert into vtocc_e(foo) values ('foo') /* _stream vtocc_e (eid id name ) (null 1 'bmFtZQ==' ); */
// the "null" value is used for auto-increment columns.
func (evs *EventStreamer) buildDMLEvent(sql string, insertid int64) (*proto.StreamEvent, int64, error) {
// first extract the comment
commentIndex := strings.LastIndex(sql, streamCommentStart)
if commentIndex == -1 {
return nil, insertid, fmt.Errorf("missing stream comment")
}
dmlComment := sql[commentIndex+streamCommentStartLen:]
// then strat building the response
dmlEvent := &proto.StreamEvent{
Category: "DML",
}
tokenizer := sqlparser.NewStringTokenizer(dmlComment)
// first parse the table name
typ, val := tokenizer.Scan()
if typ != sqlparser.ID {
return nil, insertid, fmt.Errorf("expecting table name in stream comment")
}
dmlEvent.TableName = string(val)
// then parse the PK names
var err error
dmlEvent.PrimaryKeyFields, err = parsePkNames(tokenizer)
if err != nil {
return nil, insertid, err
}
// then parse the PK values, one at a time
for typ, val = tokenizer.Scan(); typ != ';'; typ, val = tokenizer.Scan() {
switch typ {
case '(':
// pkTuple is a list of pk values
var pkTuple []sqltypes.Value
pkTuple, insertid, err = parsePkTuple(tokenizer, insertid, dmlEvent.PrimaryKeyFields)
if err != nil {
return nil, insertid, err
}
dmlEvent.PrimaryKeyValues = append(dmlEvent.PrimaryKeyValues, pkTuple)
default:
return nil, insertid, fmt.Errorf("expecting '('")
}
}
return dmlEvent, insertid, nil
}
// parsePkNames parses something like (eid id name )
func parsePkNames(tokenizer *sqlparser.Tokenizer) ([]mproto.Field, error) {
var columns []mproto.Field
if typ, _ := tokenizer.Scan(); typ != '(' {
return nil, fmt.Errorf("expecting '('")
}
for typ, val := tokenizer.Scan(); typ != ')'; typ, val = tokenizer.Scan() {
switch typ {
case sqlparser.ID:
columns = append(columns, mproto.Field{
Name: string(val),
})
default:
return nil, fmt.Errorf("syntax error at position: %d", tokenizer.Position)
}
}
return columns, nil
}
// parsePkTuple parses something like (null 1 'bmFtZQ==' )
func parsePkTuple(tokenizer *sqlparser.Tokenizer, insertid int64, fields []mproto.Field) ([]sqltypes.Value, int64, error) {
var result []sqltypes.Value
// start scanning the list
index := 0
for typ, val := tokenizer.Scan(); typ != ')'; typ, val = tokenizer.Scan() {
if index >= len(fields) {
return nil, insertid, fmt.Errorf("length mismatch in values")
}
switch typ {
case '-':
// handle negative numbers
typ2, val2 := tokenizer.Scan()
if typ2 != sqlparser.NUMBER {
return nil, insertid, fmt.Errorf("expecting number after '-'")
}
// check value
fullVal := append([]byte{'-'}, val2...)
if _, err := strconv.ParseInt(string(fullVal), 0, 64); err != nil {
return nil, insertid, err
}
// update type
switch fields[index].Type {
case mproto.VT_DECIMAL:
// we haven't updated the type yet
fields[index].Type = mproto.VT_LONGLONG
case mproto.VT_LONGLONG:
// nothing to do there
default:
// we already set this to something incompatible!
return nil, insertid, fmt.Errorf("incompatible negative number field with type %v", fields[index].Type)
}
// update value
result = append(result, sqltypes.MakeNumeric(fullVal))
case sqlparser.NUMBER:
// check value
if _, err := strconv.ParseUint(string(val), 0, 64); err != nil {
return nil, insertid, err
}
// update type
switch fields[index].Type {
case mproto.VT_DECIMAL:
// we haven't updated the type yet
fields[index].Type = mproto.VT_LONGLONG
case mproto.VT_LONGLONG:
// nothing to do there
default:
// we already set this to something incompatible!
return nil, insertid, fmt.Errorf("incompatible number field with type %v", fields[index].Type)
}
// update value
result = append(result, sqltypes.MakeNumeric(val))
case sqlparser.NULL:
// update type
switch fields[index].Type {
case mproto.VT_DECIMAL:
// we haven't updated the type yet
fields[index].Type = mproto.VT_LONGLONG
case mproto.VT_LONGLONG:
// nothing to do there
default:
// we already set this to something incompatible!
return nil, insertid, fmt.Errorf("incompatible auto-increment field with type %v", fields[index].Type)
}
// update value
result = append(result, sqltypes.MakeNumeric(strconv.AppendInt(nil, insertid, 10)))
insertid++
case sqlparser.STRING:
// update type
switch fields[index].Type {
case mproto.VT_DECIMAL:
// we haven't updated the type yet
fields[index].Type = mproto.VT_VARCHAR
case mproto.VT_VARCHAR:
// nothing to do there
default:
// we already set this to something incompatible!
return nil, insertid, fmt.Errorf("incompatible string field with type %v", fields[index].Type)
}
// update value
decoded := make([]byte, base64.StdEncoding.DecodedLen(len(val)))
numDecoded, err := base64.StdEncoding.Decode(decoded, val)
if err != nil {
return nil, insertid, err
}
result = append(result, sqltypes.MakeString(decoded[:numDecoded]))
default:
return nil, insertid, fmt.Errorf("syntax error at position: %d", tokenizer.Position)
}
index++
}
if index != len(fields) {
return nil, insertid, fmt.Errorf("length mismatch in values")
}
return result, insertid, nil
}