Add getters to BinlogSyncer for the previous GTID set, the current GT…

…ID, if it's running and the last connection id

replication/binlogsyncer.go

@@ -918,3 +918,31 @@ func (b *BinlogSyncer) killConnection(conn *client.Conn, id uint32) {
 	}
 	b.cfg.Logger.Infof("kill last connection id %d", id)
 }
+
+// GetPrevGset returns the previous GTID set.
+func (b *BinlogSyncer) GetPrevGset() GTIDSet {
+	b.m.RLock()
+	defer b.m.RUnlock()
+	return b.prevGset
+}
+
+// GetCurrGset returns the current GTID set.
+func (b *BinlogSyncer) GetCurrGset() GTIDSet {
+	b.m.RLock()
+	defer b.m.RUnlock()
+	return b.currGset
+}
+
+// IsRunning returns whether the BinlogSyncer is running.
+func (b *BinlogSyncer) IsRunning() bool {
+	b.m.RLock()
+	defer b.m.RUnlock()
+	return b.running
+}
+
+// GetLastConnectionID returns the last connection ID.
+func (b *BinlogSyncer) GetLastConnectionID() uint32 {
+	b.m.RLock()
+	defer b.m.RUnlock()
+	return b.lastConnectionID
+}