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Make it easier to handle different onChangelogEvents

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This commit is contained in:
Cathal Coffey 2021-01-31 18:23:09 +00:00
parent c681c54e8f
commit 7207bc146a
1 changed files with 10 additions and 4 deletions
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14
go/logic/migrator.go
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@ -207,12 +207,18 @@ func (this *Migrator) canStopStreaming() bool {
return atomic.LoadInt64(&this.migrationContext.CutOverCompleteFlag) != 0
}
// onChangelogStateEvent is called when a binlog event operation on the changelog table is intercepted.
func (this *Migrator) onChangelogStateEvent(dmlEvent *binlog.BinlogDMLEvent) (err error) {
// onChangelogEvent is called when a binlog event operation on the changelog table is intercepted.
func (this *Migrator) onChangelogEvent(dmlEvent *binlog.BinlogDMLEvent) (err error) {
// Hey, I created the changelog table, I know the type of columns it has!
if hint := dmlEvent.NewColumnValues.StringColumn(2); hint != "state" {
switch hint := dmlEvent.NewColumnValues.StringColumn(2); hint {
case "state":
return this.onChangelogStateEvent(dmlEvent)
default:
return nil
}
}
func (this *Migrator) onChangelogStateEvent(dmlEvent *binlog.BinlogDMLEvent) (err error) {
changelogStateString := dmlEvent.NewColumnValues.StringColumn(3)
changelogState := ReadChangelogState(changelogStateString)
this.migrationContext.Log.Infof("Intercepted changelog state %s", changelogState)
@ -995,7 +1001,7 @@ func (this *Migrator) initiateStreaming() error {
this.migrationContext.DatabaseName,
this.migrationContext.GetChangelogTableName(),
func(dmlEvent *binlog.BinlogDMLEvent) error {
return this.onChangelogStateEvent(dmlEvent)
return this.onChangelogEvent(dmlEvent)
},
)