Пример #1
0
// 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
}
Пример #2
0
// Delete deletes a key-value pair so that subsequent Get on the key returns nil.
func (db *BigTable) Delete(ctx storage.Context, tkey storage.TKey) error {
	if db == nil {
		return fmt.Errorf("Can't call Delete() on nil BigTable")
	}
	if ctx == nil {
		return fmt.Errorf("Received nil context in Delete()")
	}

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

	r, err := tbl.ReadRow(db.ctx, encodeKey(unvKey), api.RowFilter(api.StripValueFilter()))

	//A missing row will return a zero-length map and a nil error
	if len(r) == 0 {
		return fmt.Errorf("Error in Delete(): This unvKey doesn't exists")
	}

	if err != nil {
		return err
	}
	if len(r[familyName]) == 0 {
		return fmt.Errorf("Error in Delete(): This row is empty")
	}
	_, err = getValue(r, verKey)
	if err != nil {
		return fmt.Errorf("Error in Delete(): The version to be deleted doesn't exist")
	}

	mut := api.NewMutation()

	//There is only one version left, and is the one we are trying to delete\
	//remove the whole row
	if len(r[familyName]) == 1 {
		mut.DeleteRow()
	} else {
		mut.DeleteCellsInColumn(familyName, encodeKey(verKey))
	}

	err = tbl.Apply(db.ctx, encodeKey(unvKey), mut)
	if err != nil {
		return fmt.Errorf("Error in Delete(): %v\n", err)
	}

	return err
}
Пример #3
0
// 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
}
Пример #4
0
func doCount(ctx context.Context, args ...string) {
	if len(args) != 1 {
		log.Fatal("usage: cbt count <table>")
	}
	tbl := getClient().Open(args[0])

	n := 0
	err := tbl.ReadRows(ctx, bigtable.InfiniteRange(""), func(_ bigtable.Row) bool {
		n++
		return true
	}, bigtable.RowFilter(bigtable.StripValueFilter()))
	if err != nil {
		log.Fatalf("Reading rows: %v", err)
	}
	fmt.Println(n)
}
Пример #5
0
// DeleteRange removes all key-value pairs with keys in the given range.
// For all versions
func (db *BigTable) DeleteRange(ctx storage.Context, TkBeg, TkEnd storage.TKey) error {
	if db == nil {
		return fmt.Errorf("Can't call DeleteRange() on nil BigTable")
	}
	if ctx == nil {
		return fmt.Errorf("Received nil context in DeleteRange()")
	}

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

		mut := api.NewMutation()
		mut.DeleteRow()
		err = tbl.Apply(db.ctx, encodeKey(unvKeyRow), mut)
		if err != nil {
			dvid.Errorf("Failed to delete row in DeleteRange()")
		}

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

	return err
}
Пример #6
0
// DeleteAll removes all key-value pairs for the context.  If allVersions is true,
// then all versions of the data instance are deleted.
func (db *BigTable) DeleteAll(ctx storage.Context, allVersions bool) error {
	if db == nil {
		return fmt.Errorf("Can't call DeleteAll() on nil BigTable")
	}
	if ctx == nil {
		return fmt.Errorf("Received nil context in DeleteAll()")
	}

	//Row range corresponde to all keys corresponding to this data instace.
	min, max := ctx.KeyRange()
	rr := api.NewRange(encodeKey(min), encodeKey(max))

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

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

		if allVersions {

			mut := api.NewMutation()
			mut.DeleteRow()
			err := tbl.Apply(db.ctx, encodeKey(unvKeyRow), mut)
			if err != nil {
				dvid.Errorf("Failed to delete row")
			}
		} else {

			emptyTkey := make([]byte, 0)
			_, versionToDelete, err := ctx.SplitKey(emptyTkey)
			if err != nil {
				dvid.Errorf("Error in DeleteAll(): %v\n", err)
				return false
			}

			for _, readItem := range r[familyName] {

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

				if bytes.Equal(verKey, versionToDelete) {
					mut := api.NewMutation()
					mut.DeleteCellsInColumn(familyName, encodeKey(verKey))
					err := tbl.Apply(db.ctx, encodeKey(unvKeyRow), mut)
					if err != nil {
						dvid.Errorf("Failed to DeleteCellsInColumn in DeleteAll()")
					}
					return true // One I found the version I don't have to keep serching for it.
				}
			}
		}

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

	return err
}