replication: Support GTID tag in PreviousGTIDsEvent #952
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@@ -229,15 +229,59 @@ type PreviousGTIDsEvent struct { | |
| GTIDSets string | ||
| } | ||
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| type GtidFormat int | ||
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| const ( | ||
| GtidFormatClassic = iota | ||
| GtidFormatTagged | ||
| ) | ||
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| func decodeSid(data []byte) (format GtidFormat, sidnr uint64) { | ||
| if data[7] == 1 { | ||
| format = GtidFormatTagged | ||
| } | ||
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| if format == GtidFormatTagged { | ||
| sid_mask := []byte{0, 255, 255, 255, 255, 255, 255, 0} | ||
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| // Apply the mask | ||
| for i, _ := range data[:8] { | ||
| data[i] &= sid_mask[i] | ||
| } | ||
| data = append(data, 0) | ||
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| // sidnr | ||
| sidnr = binary.LittleEndian.Uint64(data[1:]) | ||
| return | ||
| } | ||
| sidnr = binary.LittleEndian.Uint64(data) | ||
| return | ||
| } | ||
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| func (e *PreviousGTIDsEvent) Decode(data []byte) error { | ||
| pos := 0 | ||
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| gtidinfo := make([]byte, 8) | ||
| copy(gtidinfo, data[:8]) | ||
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| format, uuidCount := decodeSid(gtidinfo) | ||
| pos += 8 | ||
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| previousGTIDSets := make([]string, uuidCount) | ||
| currentSetnr := 0 | ||
| for _ = range previousGTIDSets { | ||
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| uuid := e.decodeUuid(data[pos : pos+16]) | ||
| pos += 16 | ||
| isTag := false | ||
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| var tag string | ||
| if format == GtidFormatTagged { | ||
| tagLength := int(data[pos]) / 2 | ||
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| pos += 1 | ||
| if tagLength > 0 { | ||
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There was a problem hiding this comment. can the tag have zero length? please add comments There was a problem hiding this comment. https://dev.mysql.com/doc/dev/mysql-server/latest/classmysql_1_1gtid_1_1Tag.html#details
So it is non-zero if it has a tag. Note the |
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| isTag = true | ||
| tag = string(data[pos : pos+tagLength]) | ||
| pos += tagLength | ||
| } | ||
| } | ||
| sliceCount := binary.LittleEndian.Uint16(data[pos : pos+8]) | ||
| pos += 8 | ||
| intervals := make([]string, sliceCount) | ||
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@@ -254,9 +298,14 @@ func (e *PreviousGTIDsEvent) Decode(data []byte) error { | |
| } | ||
| intervals[i] = interval | ||
| } | ||
| if isTag { | ||
| previousGTIDSets[currentSetnr-1] += fmt.Sprintf(":%s:%s", tag, strings.Join(intervals, ":")) | ||
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| } else { | ||
| previousGTIDSets[currentSetnr] = fmt.Sprintf("%s:%s", uuid, strings.Join(intervals, ":")) | ||
| currentSetnr += 1 | ||
| } | ||
| } | ||
| e.GTIDSets = strings.Join(previousGTIDSets[:currentSetnr], ",") | ||
| return nil | ||
| } | ||
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