コード例 #1
0
ファイル: bigtable.go プロジェクト: tartavull/dvid
// KeysInRange returns a range of type-specific key components spanning (TkBeg, TkEnd).
func (db *BigTable) KeysInRange(ctx storage.Context, TkBeg, TkEnd storage.TKey) ([]storage.TKey, error) {
	if db == nil {
		return nil, fmt.Errorf("Can't call KeysInRange() on nil BigTable")
	}
	if ctx == nil {
		return nil, fmt.Errorf("Received nil context in KeysInRange()")
	}

	tKeys := make([]storage.TKey, 0)

	unvKeyBeg, _, err := ctx.SplitKey(TkBeg)
	if err != nil {
		dvid.Errorf("Error in KeysInRange(): %v\n", err)
	}

	unvKeyEnd, _, err := ctx.SplitKey(TkEnd)
	if err != nil {
		dvid.Errorf("Error in KeysInRange(): %v\n", err)
	}

	rr := api.NewRange(encodeKey(unvKeyBeg), encodeKey(unvKeyEnd))

	err = tbl.ReadRows(db.ctx, rr, func(r api.Row) bool {

		if len(r[familyName]) == 0 {
			dvid.Errorf("Error in KeysInRange(): row has no columns")
			return false
		}

		unvKeyRow, err := decodeKey(r.Key())
		if err != nil {
			dvid.Errorf("Error in KeysInRange(): %v\n", err)
			return false
		}

		verKeyRow, err := decodeKey(r[familyName][0].Column)
		if err != nil {
			dvid.Errorf("Error in KeysInRange(): %v\n", err)
			return false
		}

		fullKey := storage.MergeKey(unvKeyRow, verKeyRow)
		tkey, err := storage.TKeyFromKey(fullKey)
		if err != nil {
			dvid.Errorf("Error in KeysInRange(): %v\n", err)
			return false
		}

		tKeys = append(tKeys, tkey)

		return true // keep going
	}, api.RowFilter(api.StripValueFilter()))

	return tKeys, err
}
コード例 #2
0
ファイル: bigtable.go プロジェクト: tartavull/dvid
// GetRange returns a range of values spanning (TkBeg, kEnd) keys.
func (db *BigTable) GetRange(ctx storage.Context, TkBeg, TkEnd storage.TKey) ([]*storage.TKeyValue, error) {
	if db == nil {
		return nil, fmt.Errorf("Can't call GetRange() on nil BigTable")
	}
	if ctx == nil {
		return nil, fmt.Errorf("Received nil context in GetRange()")
	}

	unvKeyBeg, _, err := ctx.SplitKey(TkBeg)
	if err != nil {
		dvid.Errorf("Error in GetRange(): %v\n", err)
	}
	unvKeyEnd, _, err := ctx.SplitKey(TkEnd)
	if err != nil {
		dvid.Errorf("Error in GetRange(): %v\n", err)
	}

	tKeyValues := make([]*storage.TKeyValue, 0)

	rr := api.NewRange(encodeKey(unvKeyBeg), encodeKey(unvKeyEnd))
	err = tbl.ReadRows(db.ctx, rr, func(r api.Row) bool {

		unvKeyRow, err := decodeKey(r.Key())
		if err != nil {
			dvid.Errorf("Error in GetRange() decodeKey(r.Key()): %v\n", err)
			return false
		}

		// dvid.Infof("GetRange() with row key= %v", r.Key())
		for _, readItem := range r[familyName] {

			verKey, err := decodeKey(readItem.Column)
			if err != nil {
				dvid.Errorf("Error in GetRange() decodeKey(readItem.Column): %v\n", err)
				return false
			}

			fullKey := storage.MergeKey(unvKeyRow, verKey)
			// dvid.Infof("colum key= %v , timestamp = %v", verKey, readItem.Timestamp)
			tkey, err := storage.TKeyFromKey(fullKey)
			if err != nil {
				dvid.Errorf("Error in GetRange() storage.TKeyFromKey(fullKey): %v\n", err)
				return false
			}

			kv := storage.TKeyValue{tkey, readItem.Value}
			tKeyValues = append(tKeyValues, &kv)
		}

		return true // keep going
	})

	return tKeyValues, err
}
コード例 #3
0
ファイル: bigtable.go プロジェクト: tartavull/dvid
// SendKeysInRange sends a range of full keys down a key channel.
func (db *BigTable) SendKeysInRange(ctx storage.Context, TkBeg, TkEnd storage.TKey, ch storage.KeyChan) error {
	if db == nil {
		return fmt.Errorf("Can't call SendKeysInRange() on nil BigTable")
	}
	if ctx == nil {
		return fmt.Errorf("Received nil context in SendKeysInRange()")
	}

	unvKeyBeg, _, err := ctx.SplitKey(TkBeg)
	if err != nil {
		dvid.Errorf("Error in SendKeysInRange(): %v\n", err)
	}

	unvKeyEnd, _, err := ctx.SplitKey(TkEnd)
	if err != nil {
		dvid.Errorf("Error in SendKeysInRange(): %v\n", err)
	}

	rr := api.NewRange(encodeKey(unvKeyBeg), encodeKey(unvKeyEnd))

	err = tbl.ReadRows(db.ctx, rr, func(r api.Row) bool {

		unvKeyRow, err := decodeKey(r.Key())
		if err != nil {
			dvid.Errorf("Error in SendKeysInRange(): %v\n", err)
			return false
		}

		//I need the versioned key to merged it with the unversioned
		// and send it throu the channel
		for _, readItem := range r[familyName] {

			verKey, err := decodeKey(readItem.Column)
			if err != nil {
				dvid.Errorf("Error in SendKeysInRange(): %v\n", err)
				return false
			}

			fullKey := storage.MergeKey(unvKeyRow, verKey)

			ch <- fullKey
		}

		return true // keep going
	}, api.RowFilter(api.StripValueFilter()))

	return err
}
コード例 #4
0
ファイル: bigtable.go プロジェクト: tartavull/dvid
// RawRangeQuery sends a range of full keys.  This is to be used for low-level data
// retrieval like DVID-to-DVID communication and should not be used by data type
// implementations if possible because each version's key-value pairs are sent
// without filtering by the current version and its ancestor graph.  A nil is sent
// down the channel when the range is complete.
func (db *BigTable) RawRangeQuery(kStart, kEnd storage.Key, keysOnly bool, out chan *storage.KeyValue, cancel <-chan struct{}) error {
	if db == nil {
		return fmt.Errorf("Can't call RawRangeQuery() on nil BigTable")
	}

	unvKeyBeg, verKeyBeg, err := storage.SplitKey(kStart)
	if err != nil {
		dvid.Errorf("Error in RawRangeQuery(): %v\n", err)
		return err
	}

	unvKeyEnd, verKeyEnd, err := storage.SplitKey(kEnd)
	if err != nil {
		dvid.Errorf("Error in RawRangeQuery(): %v\n", err)
		return err
	}

	rr := api.NewRange(encodeKey(unvKeyBeg), encodeKey(unvKeyEnd))

	err = tbl.ReadRows(db.ctx, rr, func(r api.Row) bool {
		if cancel != nil {
			select {
			case <-cancel:
				out <- nil
				return nil
			default:
			}
		}

		unvKeyRow, err := decodeKey(r.Key())
		if err != nil {
			dvid.Errorf("Error in RawRangeQuery(): %v\n", err)
			return false
		}

		//I need the versioned key to merged it with the unversioned
		// and send it throu the channel
		for _, readItem := range r[familyName] {

			verKey, err := decodeKey(readItem.Column)
			if err != nil {
				dvid.Errorf("Error in RawRangeQuery(): %v\n", err)
				return false
			}

			lowerLimit := bytes.Equal(unvKeyBeg, unvKeyRow) && bytes.Compare(verKey, verKeyBeg) == -1
			upperLimit := bytes.Equal(unvKeyEnd, unvKeyRow) && bytes.Compare(verKey, verKeyEnd) >= 0

			if lowerLimit || upperLimit {
				continue
			}

			fullKey := storage.MergeKey(unvKeyRow, verKey)

			kv := storage.KeyValue{fullKey, readItem.Value}

			out <- &kv
		}

		return true // keep going
	})
	return nil
}
コード例 #5
0
ファイル: bigtable.go プロジェクト: tartavull/dvid
// ProcessRange sends a range of type key-value pairs to type-specific chunk handlers,
// allowing chunk processing to be concurrent with key-value sequential reads.
// Since the chunks are typically sent during sequential read iteration, the
// receiving function can be organized as a pool of chunk handling goroutines.
// See datatype/imageblk.ProcessChunk() for an example.
func (db *BigTable) ProcessRange(ctx storage.Context, TkBeg, TkEnd storage.TKey, op *storage.ChunkOp, f storage.ChunkFunc) error {
	if db == nil {
		return fmt.Errorf("Can't call ProcessRange() on nil BigTable")
	}
	if ctx == nil {
		return fmt.Errorf("Received nil context in ProcessRange()")
	}

	unvKeyBeg, verKey, err := ctx.SplitKey(TkBeg)
	if err != nil {
		dvid.Errorf("Error in ProcessRange(): %v\n", err)
	}

	unvKeyEnd, _, err := ctx.SplitKey(TkEnd)
	if err != nil {
		dvid.Errorf("Error in ProcessRange(): %v\n", err)
	}

	rr := api.NewRange(encodeKey(unvKeyBeg), encodeKey(unvKeyEnd))
	err = tbl.ReadRows(db.ctx, rr, func(r api.Row) bool {

		if len(r[familyName]) == 0 {
			dvid.Errorf("Error in KeysInRange(): row has no columns")
			return false
		}

		unvKeyRow, err := decodeKey(r.Key())
		if err != nil {
			dvid.Errorf("Error in ProcessRange(): %v\n", err)
			return false
		}

		verKeyRow, err := decodeKey(r[familyName][0].Column)
		if err != nil {
			dvid.Errorf("Error in ProcessRange(): %v\n", err)
			return false
		}

		fullKey := storage.MergeKey(unvKeyRow, verKeyRow)
		tkey, err := storage.TKeyFromKey(fullKey)
		if err != nil {
			dvid.Errorf("Error in ProcessRange(): %v\n", err)
			return false
		}

		if op.Wg != nil {
			op.Wg.Add(1)
		}
		value, err := getValue(r, verKey)
		if err != nil {
			dvid.Errorf("Error in ProcessRange(): %v\n", err)
			return false
		}

		tkv := storage.TKeyValue{tkey, value}
		chunk := &storage.Chunk{op, &tkv}
		if err := f(chunk); err != nil {
			dvid.Errorf("Error in ProcessRange(): %v\n", err)
			return false
		}

		return true // keep going
	})

	return err
}