Golang Impl.GetShard方法代码示例

// CopyShardReplications will create the ShardReplication objects in
// the destination topo
func CopyShardReplications(ctx context.Context, fromTS, toTS topo.Impl) {
	keyspaces, err := fromTS.GetKeyspaces(ctx)
	if err != nil {
		log.Fatalf("fromTS.GetKeyspaces: %v", err)
	}
	tts := topo.Server{
		Impl: toTS,
	}

	wg := sync.WaitGroup{}
	rec := concurrency.AllErrorRecorder{}
	for _, keyspace := range keyspaces {
		wg.Add(1)
		go func(keyspace string) {
			defer wg.Done()
			shards, err := fromTS.GetShardNames(ctx, 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
					s, _, err := fromTS.GetShard(ctx, keyspace, shard)
					if err != nil {
						rec.RecordError(fmt.Errorf("GetShard(%v, %v): %v", keyspace, shard, err))
						return
					}

					for _, cell := range s.Cells {
						sri, err := fromTS.GetShardReplication(ctx, cell, keyspace, shard)
						if err != nil {
							rec.RecordError(fmt.Errorf("GetShardReplication(%v, %v, %v): %v", cell, keyspace, shard, err))
							continue
						}

						if err := tts.UpdateShardReplicationFields(ctx, cell, keyspace, shard, func(oldSR *topodatapb.ShardReplication) error {
							*oldSR = *sri.ShardReplication
							return nil
						}); err != nil {
							rec.RecordError(fmt.Errorf("UpdateShardReplicationFields(%v, %v, %v): %v", cell, keyspace, shard, err))
						}
					}
				}(keyspace, shard)
			}
		}(keyspace)
	}
	wg.Wait()
	if rec.HasErrors() {
		log.Fatalf("copyShards failed: %v", rec.Error())
	}
}

// CopyShards will create the shards in the destination topo
func CopyShards(ctx context.Context, fromTS, toTS topo.Impl) {
	keyspaces, err := fromTS.GetKeyspaces(ctx)
	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(ctx, 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()
					if err := toTS.CreateShard(ctx, keyspace, shard, &topodatapb.Shard{}); err != nil {
						if err == topo.ErrNodeExists {
							log.Warningf("shard %v/%v already exists", keyspace, shard)
						} else {
							rec.RecordError(fmt.Errorf("CreateShard(%v, %v): %v", keyspace, shard, err))
							return
						}
					}

					s, _, err := fromTS.GetShard(ctx, keyspace, shard)
					if err != nil {
						rec.RecordError(fmt.Errorf("GetShard(%v, %v): %v", keyspace, shard, err))
						return
					}

					_, toV, err := toTS.GetShard(ctx, keyspace, shard)
					if err != nil {
						rec.RecordError(fmt.Errorf("toTS.GetShard(%v, %v): %v", keyspace, shard, err))
						return
					}

					if _, err := toTS.UpdateShard(ctx, keyspace, shard, s, toV); err != nil {
						rec.RecordError(fmt.Errorf("UpdateShard(%v, %v): %v", keyspace, shard, err))
					}
				}(keyspace, shard)
			}
		}(keyspace)
	}
	wg.Wait()
	if rec.HasErrors() {
		log.Fatalf("copyShards failed: %v", rec.Error())
	}
}

// checkShard verifies the Shard operations work correctly
func checkShard(t *testing.T, ts topo.Impl) {
	ctx := context.Background()
	tts := topo.Server{Impl: ts}

	if err := ts.CreateKeyspace(ctx, "test_keyspace", &topodatapb.Keyspace{}); err != nil {
		t.Fatalf("CreateKeyspace: %v", err)
	}

	shard := &topodatapb.Shard{
		KeyRange: newKeyRange("b0-c0"),
	}
	if err := ts.CreateShard(ctx, "test_keyspace", "b0-c0", shard); err != nil {
		t.Fatalf("CreateShard: %v", err)
	}
	if err := ts.CreateShard(ctx, "test_keyspace", "b0-c0", shard); err != topo.ErrNodeExists {
		t.Errorf("CreateShard called second time, got: %v", err)
	}

	// Delete shard and see if we can re-create it.
	if err := ts.DeleteShard(ctx, "test_keyspace", "b0-c0"); err != nil {
		t.Fatalf("DeleteShard: %v", err)
	}
	if err := ts.CreateShard(ctx, "test_keyspace", "b0-c0", shard); err != nil {
		t.Fatalf("CreateShard: %v", err)
	}

	// Delete ALL shards.
	if err := ts.DeleteKeyspaceShards(ctx, "test_keyspace"); err != nil {
		t.Fatalf("DeleteKeyspaceShards: %v", err)
	}
	if err := ts.CreateShard(ctx, "test_keyspace", "b0-c0", shard); err != nil {
		t.Fatalf("CreateShard: %v", err)
	}

	if _, _, err := ts.GetShard(ctx, "test_keyspace", "666"); err != topo.ErrNoNode {
		t.Errorf("GetShard(666): %v", err)
	}

	shard, version, err := ts.GetShard(ctx, "test_keyspace", "b0-c0")
	if err != nil {
		t.Errorf("GetShard: %v", err)
	}
	if want := newKeyRange("b0-c0"); !key.KeyRangeEqual(shard.KeyRange, want) {
		t.Errorf("shard.KeyRange: want %v, got %v", want, shard.KeyRange)
	}
	master := &topodatapb.TabletAlias{Cell: "ny", Uid: 1}
	shard.MasterAlias = master
	shard.KeyRange = newKeyRange("b0-c0")
	shard.ServedTypes = []*topodatapb.Shard_ServedType{
		{
			TabletType: topodatapb.TabletType_MASTER,
		},
		{
			TabletType: topodatapb.TabletType_REPLICA,
			Cells:      []string{"c1"},
		},
		{
			TabletType: topodatapb.TabletType_RDONLY,
		},
	}
	shard.SourceShards = []*topodatapb.Shard_SourceShard{
		{
			Uid:      1,
			Keyspace: "source_ks",
			Shard:    "b8-c0",
			KeyRange: newKeyRange("b8-c0"),
			Tables:   []string{"table1", "table2"},
		},
	}
	shard.TabletControls = []*topodatapb.Shard_TabletControl{
		{
			TabletType:        topodatapb.TabletType_MASTER,
			Cells:             []string{"c1", "c2"},
			BlacklistedTables: []string{"black1", "black2"},
		},
		{
			TabletType:          topodatapb.TabletType_REPLICA,
			DisableQueryService: true,
		},
	}
	if _, err := ts.UpdateShard(ctx, "test_keyspace", "b0-c0", shard, version); err != nil {
		t.Errorf("UpdateShard: %v", err)
	}

	other := &topodatapb.TabletAlias{Cell: "ny", Uid: 82873}
	_, err = tts.UpdateShardFields(ctx, "test_keyspace", "b0-c0", func(si *topo.ShardInfo) error {
		si.MasterAlias = other
		return nil
	})
	if err != nil {
		t.Fatalf("UpdateShardFields error: %v", err)
	}

	s, _, err := ts.GetShard(ctx, "test_keyspace", "b0-c0")
	if err != nil {
		t.Fatalf("GetShard: %v", err)
	}
	if *s.MasterAlias != *other {
		t.Fatalf("shard.MasterAlias = %v, want %v", s.MasterAlias, other)
//.........这里部分代码省略.........