// CopyShardReplications will create the ShardReplication objects in
// the destination topo
func CopyShardReplications(fromTS, toTS topo.Server) {
keyspaces, err := fromTS.GetKeyspaces()
if err != nil {
log.Fatalf("fromTS.GetKeyspaces: %v", err)
}
wg := sync.WaitGroup{}
rec := concurrency.AllErrorRecorder{}
for _, keyspace := range keyspaces {
wg.Add(1)
go func(keyspace string) {
defer wg.Done()
shards, err := fromTS.GetShardNames(keyspace)
if err != nil {
rec.RecordError(fmt.Errorf("GetShardNames(%v): %v", keyspace, err))
return
}
for _, shard := range shards {
wg.Add(1)
go func(keyspace, shard string) {
defer wg.Done()
// read the source shard to get the cells
si, err := fromTS.GetShard(keyspace, shard)
if err != nil {
rec.RecordError(fmt.Errorf("GetShard(%v, %v): %v", keyspace, shard, err))
return
}
for _, cell := range si.Cells {
sri, err := fromTS.GetShardReplication(cell, keyspace, shard)
if err != nil {
rec.RecordError(fmt.Errorf("GetShardReplication(%v, %v, %v): %v", cell, keyspace, shard, err))
continue
}
err = toTS.CreateShardReplication(cell, keyspace, shard, sri.ShardReplication)
switch err {
case nil:
// good
case topo.ErrNodeExists:
if err := toTS.UpdateShardReplicationFields(cell, keyspace, shard, func(oldSR *topo.ShardReplication) error {
*oldSR = *sri.ShardReplication
return nil
}); err != nil {
rec.RecordError(fmt.Errorf("UpdateShardReplicationFields(%v, %v, %v): %v", cell, keyspace, shard, err))
}
default:
rec.RecordError(fmt.Errorf("CreateShardReplication(%v, %v, %v): %v", cell, keyspace, shard, err))
}
}
}(keyspace, shard)
}
}(keyspace)
}
wg.Wait()
if rec.HasErrors() {
log.Fatalf("copyShards failed: %v", rec.Error())
}
}
func CheckShardReplication(t *testing.T, ts topo.Server) {
cell := getLocalCell(t, ts)
if _, err := ts.GetShardReplication(cell, "test_keyspace", "-10"); err != topo.ErrNoNode {
t.Errorf("GetShardReplication(not there): %v", err)
}
sr := &topo.ShardReplication{
ReplicationLinks: []topo.ReplicationLink{
topo.ReplicationLink{
TabletAlias: topo.TabletAlias{
Cell: "c1",
Uid: 1,
},
Parent: topo.TabletAlias{
Cell: "c2",
Uid: 2,
},
},
},
}
if err := ts.CreateShardReplication(cell, "test_keyspace", "-10", sr); err != nil {
t.Fatalf("CreateShardReplication() failed: %v", err)
}
if sri, err := ts.GetShardReplication(cell, "test_keyspace", "-10"); err != nil {
t.Errorf("GetShardReplication(new guy) failed: %v", err)
} else {
if len(sri.ReplicationLinks) != 1 ||
sri.ReplicationLinks[0].TabletAlias.Cell != "c1" ||
sri.ReplicationLinks[0].TabletAlias.Uid != 1 ||
sri.ReplicationLinks[0].Parent.Cell != "c2" ||
sri.ReplicationLinks[0].Parent.Uid != 2 {
t.Errorf("GetShardReplication(new guy) returned wrong value: %v", *sri)
}
}
if err := ts.UpdateShardReplicationFields(cell, "test_keyspace", "-10", func(sr *topo.ShardReplication) error {
sr.ReplicationLinks = append(sr.ReplicationLinks, topo.ReplicationLink{
TabletAlias: topo.TabletAlias{
Cell: "c3",
Uid: 3,
},
Parent: topo.TabletAlias{
Cell: "c4",
Uid: 4,
},
})
return nil
}); err != nil {
t.Errorf("UpdateShardReplicationFields() failed: %v", err)
}
if sri, err := ts.GetShardReplication(cell, "test_keyspace", "-10"); err != nil {
t.Errorf("GetShardReplication(after append) failed: %v", err)
} else {
if len(sri.ReplicationLinks) != 2 ||
sri.ReplicationLinks[0].TabletAlias.Cell != "c1" ||
sri.ReplicationLinks[0].TabletAlias.Uid != 1 ||
sri.ReplicationLinks[0].Parent.Cell != "c2" ||
sri.ReplicationLinks[0].Parent.Uid != 2 ||
sri.ReplicationLinks[1].TabletAlias.Cell != "c3" ||
sri.ReplicationLinks[1].TabletAlias.Uid != 3 ||
sri.ReplicationLinks[1].Parent.Cell != "c4" ||
sri.ReplicationLinks[1].Parent.Uid != 4 {
t.Errorf("GetShardReplication(new guy) returned wrong value: %v", *sri)
}
}
if err := ts.DeleteShardReplication(cell, "test_keyspace", "-10"); err != nil {
t.Errorf("DeleteShardReplication(existing) failed: %v", err)
}
if err := ts.DeleteShardReplication(cell, "test_keyspace", "-10"); err != topo.ErrNoNode {
t.Errorf("DeleteShardReplication(again) returned: %v", err)
}
}