| package sarama |
| |
| //ControlRecordType ... |
| type ControlRecordType int |
| |
| const ( |
| //ControlRecordAbort is a control record for abort |
| ControlRecordAbort ControlRecordType = iota |
| //ControlRecordCommit is a control record for commit |
| ControlRecordCommit |
| //ControlRecordUnknown is a control record of unknown type |
| ControlRecordUnknown |
| ) |
| |
| // Control records are returned as a record by fetchRequest |
| // However unlike "normal" records, they mean nothing application wise. |
| // They only serve internal logic for supporting transactions. |
| type ControlRecord struct { |
| Version int16 |
| CoordinatorEpoch int32 |
| Type ControlRecordType |
| } |
| |
| func (cr *ControlRecord) decode(key, value packetDecoder) error { |
| var err error |
| cr.Version, err = value.getInt16() |
| if err != nil { |
| return err |
| } |
| |
| cr.CoordinatorEpoch, err = value.getInt32() |
| if err != nil { |
| return err |
| } |
| |
| // There a version for the value part AND the key part. And I have no idea if they are supposed to match or not |
| // Either way, all these version can only be 0 for now |
| cr.Version, err = key.getInt16() |
| if err != nil { |
| return err |
| } |
| |
| recordType, err := key.getInt16() |
| if err != nil { |
| return err |
| } |
| |
| switch recordType { |
| case 0: |
| cr.Type = ControlRecordAbort |
| case 1: |
| cr.Type = ControlRecordCommit |
| default: |
| // from JAVA implementation: |
| // UNKNOWN is used to indicate a control type which the client is not aware of and should be ignored |
| cr.Type = ControlRecordUnknown |
| } |
| return nil |
| } |
| |
| func (cr *ControlRecord) encode(key, value packetEncoder) { |
| value.putInt16(cr.Version) |
| value.putInt32(cr.CoordinatorEpoch) |
| key.putInt16(cr.Version) |
| |
| switch cr.Type { |
| case ControlRecordAbort: |
| key.putInt16(0) |
| case ControlRecordCommit: |
| key.putInt16(1) |
| } |
| } |