replication: fix MariadbGTIDListEvent Decode with multi GTIDs (go-mysql-org#365)

Author: csuzhangxc

replication/event.go

@@ -476,6 +476,7 @@ func (e *MariadbGTIDListEvent) Decode(data []byte) error {
 e.GTIDs[i].ServerID = binary.LittleEndian.Uint32(data[pos:])
 pos += 4
 e.GTIDs[i].SequenceNumber = binary.LittleEndian.Uint64(data[pos:])
+pos += 8
 }
 
 return nil

replication/event_test.go

@@ -0,0 +1,29 @@
+package replication
+
+import (
+. "github.com/pingcap/check"
+)
+
+func (_ *testDecodeSuite) TestMariadbGTIDListEvent(c *C) {
+// single GTID, 1-2-3
+data := []byte{1, 0, 0, 0, 1, 0, 0, 0, 2, 0, 0, 0, 3, 0, 0, 0, 0, 0, 0, 0}
+ev := MariadbGTIDListEvent{}
+err := ev.Decode(data)
+c.Assert(err, IsNil)
+c.Assert(len(ev.GTIDs), Equals, 1)
+c.Assert(ev.GTIDs[0].DomainID, Equals, uint32(1))
+c.Assert(ev.GTIDs[0].ServerID, Equals, uint32(2))
+c.Assert(ev.GTIDs[0].SequenceNumber, Equals, uint64(3))
+
+// multi GTIDs, 1-2-3,4-5-6,7-8-9
+data = []byte{3, 0, 0, 0, 1, 0, 0, 0, 2, 0, 0, 0, 3, 0, 0, 0, 0, 0, 0, 0, 4, 0, 0, 0, 5, 0, 0, 0, 6, 0, 0, 0, 0, 0, 0, 0, 7, 0, 0, 0, 8, 0, 0, 0, 9, 0, 0, 0, 0, 0, 0, 0}
+ev = MariadbGTIDListEvent{}
+err = ev.Decode(data)
+c.Assert(err, IsNil)
+c.Assert(len(ev.GTIDs), Equals, 3)
+for i := 0; i < 3; i++ {
+c.Assert(ev.GTIDs[i].DomainID, Equals, uint32(1+3*i))
+c.Assert(ev.GTIDs[i].ServerID, Equals, uint32(2+3*i))
+c.Assert(ev.GTIDs[i].SequenceNumber, Equals, uint64(3+3*i))
+}
+}