Esempio n. 1
0
// writeDescriptor takes a Table or Database descriptor and writes it
// if needed, incrementing the descriptor counter.
func (p *planner) writeDescriptor(plainKey descriptorKey, descriptor descriptorProto, ifNotExists bool) error {
	key := plainKey.Key()
	// Check whether key exists.
	gr, err := p.txn.Get(key)
	if err != nil {
		return err
	}

	if gr.Exists() {
		if ifNotExists {
			// Noop.
			return nil
		}
		// Key exists, but we don't want it to: error out.
		return fmt.Errorf("%s %q already exists", descriptor.TypeName(), plainKey.Name())
	}

	// Increment unique descriptor counter.
	if ir, err := p.txn.Inc(keys.DescIDGenerator, 1); err == nil {
		descriptor.SetID(structured.ID(ir.ValueInt() - 1))
	} else {
		return err
	}

	// TODO(pmattis): The error currently returned below is likely going to be
	// difficult to interpret.
	// TODO(pmattis): Need to handle if-not-exists here as well.
	descKey := structured.MakeDescMetadataKey(descriptor.GetID())
	b := client.Batch{}
	b.CPut(key, descKey, nil)
	b.CPut(descKey, descriptor, nil)
	return p.txn.Run(&b)
}
Esempio n. 2
0
func decodeIndexKey(desc *structured.TableDescriptor,
	index structured.IndexDescriptor, vals map[string]parser.Datum, key []byte) ([]byte, error) {
	if !bytes.HasPrefix(key, keys.TableDataPrefix) {
		return nil, fmt.Errorf("%s: invalid key prefix: %q", desc.Name, key)
	}
	key = bytes.TrimPrefix(key, keys.TableDataPrefix)

	var tableID uint64
	key, tableID = encoding.DecodeUvarint(key)
	if structured.ID(tableID) != desc.ID {
		return nil, fmt.Errorf("%s: unexpected table ID: %d != %d", desc.Name, desc.ID, tableID)
	}

	var indexID uint64
	key, indexID = encoding.DecodeUvarint(key)
	if structured.ID(indexID) != index.ID {
		return nil, fmt.Errorf("%s: unexpected index ID: %d != %d", desc.Name, index.ID, indexID)
	}

	for _, id := range index.ColumnIDs {
		col, err := desc.FindColumnByID(id)
		if err != nil {
			return nil, err
		}
		switch col.Type.Kind {
		case structured.ColumnType_BIT, structured.ColumnType_INT:
			var i int64
			key, i = encoding.DecodeVarint(key)
			vals[col.Name] = parser.DInt(i)
		case structured.ColumnType_FLOAT:
			var f float64
			key, f = encoding.DecodeNumericFloat(key)
			vals[col.Name] = parser.DFloat(f)
		case structured.ColumnType_CHAR, structured.ColumnType_TEXT,
			structured.ColumnType_BLOB:
			var r []byte
			key, r = encoding.DecodeBytes(key, nil)
			vals[col.Name] = parser.DString(r)
		default:
			return nil, util.Errorf("TODO(pmattis): decoded index key: %s", col.Type.Kind)
		}
	}

	return key, nil
}
Esempio n. 3
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// decodeIndexKey decodes the values that are a part of the specified index
// key. Vals is a slice returned from makeIndexKeyVals. The remaining bytes in
// the index key are returned which will either be an encoded column ID for the
// primary key index, the primary key suffix for non-unique secondary indexes
// or unique secondary indexes containing NULL or empty.
func decodeIndexKey(desc *structured.TableDescriptor,
	index structured.IndexDescriptor, vals []parser.Datum, key []byte) ([]byte, error) {
	if !bytes.HasPrefix(key, keys.TableDataPrefix) {
		return nil, fmt.Errorf("%s: invalid key prefix: %q", desc.Name, key)
	}
	key = bytes.TrimPrefix(key, keys.TableDataPrefix)

	var tableID uint64
	key, tableID = encoding.DecodeUvarint(key)
	if structured.ID(tableID) != desc.ID {
		return nil, fmt.Errorf("%s: unexpected table ID: %d != %d", desc.Name, desc.ID, tableID)
	}

	var indexID uint64
	key, indexID = encoding.DecodeUvarint(key)
	if structured.IndexID(indexID) != index.ID {
		return nil, fmt.Errorf("%s: unexpected index ID: %d != %d", desc.Name, index.ID, indexID)
	}

	for j := range vals {
		switch vals[j].(type) {
		case parser.DInt:
			var i int64
			key, i = encoding.DecodeVarint(key)
			vals[j] = parser.DInt(i)
		case parser.DFloat:
			var f float64
			key, f = encoding.DecodeNumericFloat(key)
			vals[j] = parser.DFloat(f)
		case parser.DString:
			var r []byte
			key, r = encoding.DecodeBytes(key, nil)
			vals[j] = parser.DString(r)
		default:
			return nil, util.Errorf("TODO(pmattis): decoded index key: %s", vals[j].Type())
		}
	}

	return key, nil
}
Esempio n. 4
0
func (n *scanNode) Next() bool {
	if n.err != nil {
		return false
	}

	if n.kvs == nil {
		// Initialize our key/values.
		if n.desc == nil {
			// No table to read from, pretend there is a single empty row.
			n.kvs = []client.KeyValue{}
			n.primaryKey = []byte{}
		} else {
			// Retrieve all of the keys that start with our index key prefix.
			startKey := proto.Key(structured.MakeIndexKeyPrefix(n.desc.ID, n.desc.PrimaryIndex.ID))
			endKey := startKey.PrefixEnd()
			// TODO(pmattis): Currently we retrieve all of the key/value pairs for
			// the table. We could enhance this code so that it retrieves the
			// key/value pairs in chunks.
			n.kvs, n.err = n.db.Scan(startKey, endKey, 0)
			if n.err != nil {
				return false
			}
		}
	}

	// All of the columns for a particular row will be grouped together. We loop
	// over the key/value pairs and decode the key to extract the columns encoded
	// within the key and the column ID. We use the column ID to lookup the
	// column and decode the value. All of these values go into a map keyed by
	// column name. When the index key changes we output a row containing the
	// current values.
	for {
		var kv client.KeyValue
		if n.kvIndex < len(n.kvs) {
			kv = n.kvs[n.kvIndex]
		}

		if n.primaryKey != nil &&
			(n.kvIndex == len(n.kvs) || !bytes.HasPrefix(kv.Key, n.primaryKey)) {
			// The current key belongs to a new row. Output the current row.
			n.primaryKey = nil
			var output bool
			output, n.err = n.filterRow()
			if n.err != nil {
				return false
			}
			if output {
				if n.err = n.renderRow(); n.err != nil {
					return false
				}
				return true
			}
		}

		if n.kvIndex == len(n.kvs) {
			return false
		}

		if n.primaryKey == nil {
			// This is the first key for the row, reset our vals map.
			n.vals = valMap{}
		}

		var remaining []byte
		remaining, n.err = decodeIndexKey(n.desc, n.desc.PrimaryIndex, n.vals, kv.Key)
		if n.err != nil {
			return false
		}
		n.primaryKey = []byte(kv.Key[:len(kv.Key)-len(remaining)])

		// TODO(pmattis): We should avoid looking up the column name by column ID
		// on every key. One possibility is that we could rewrite col-name
		// references in expressions to refer to <table-id, col-id> tuples.
		_, colID := encoding.DecodeUvarint(remaining)
		var col *structured.ColumnDescriptor
		col, n.err = n.desc.FindColumnByID(structured.ID(colID))
		if n.err != nil {
			return false
		}
		n.vals[col.Name] = unmarshalValue(*col, kv)

		if log.V(2) {
			log.Infof("Scan %q -> %v", kv.Key, n.vals[col.Name])
		}

		n.kvIndex++
	}
}
Esempio n. 5
0
func TestDatabaseDescriptor(t *testing.T) {
	defer leaktest.AfterTest(t)
	s, sqlDB, kvDB := setup(t)
	defer cleanup(s, sqlDB)

	// The first `MaxReservedDescID` (plus 0) are set aside.
	expectedCounter := int64(structured.MaxReservedDescID + 1)

	// Test values before creating the database.
	// descriptor ID counter.
	if ir, err := kvDB.Get(keys.DescIDGenerator); err != nil {
		t.Fatal(err)
	} else if actual := ir.ValueInt(); actual != expectedCounter {
		t.Fatalf("expected descriptor ID == %d, got %d", expectedCounter, actual)
	}

	// Database name.
	nameKey := structured.MakeNameMetadataKey(structured.RootNamespaceID, "test")
	if gr, err := kvDB.Get(nameKey); err != nil {
		t.Fatal(err)
	} else if gr.Exists() {
		t.Fatal("expected non-existing key")
	}

	// Write some junk that is going to interfere with table creation.
	dbDescKey := structured.MakeDescMetadataKey(structured.ID(expectedCounter))
	if err := kvDB.CPut(dbDescKey, "foo", nil); err != nil {
		t.Fatal(err)
	}

	// Table creation should fail, and nothing should have been written.
	if _, err := sqlDB.Exec(`CREATE DATABASE test`); !testutils.IsError(err, "unexpected value") {
		t.Fatalf("unexpected error %s", err)
	}

	if ir, err := kvDB.Get(keys.DescIDGenerator); err != nil {
		t.Fatal(err)
	} else if actual := ir.ValueInt(); actual != expectedCounter {
		t.Fatalf("expected descriptor ID == %d, got %d", expectedCounter, actual)
	}

	if kvs, err := kvDB.Scan(keys.NameMetadataPrefix, keys.NameMetadataPrefix.PrefixEnd(), 0); err != nil {
		t.Fatal(err)
	} else {
		if a, e := len(kvs), 0; a != e {
			t.Fatalf("expected %d keys to have been written, found %d keys", e, a)
		}
	}

	// Remove the junk; allow table creation to proceed.
	if err := kvDB.Del(dbDescKey); err != nil {
		t.Fatal(err)
	}

	if _, err := sqlDB.Exec(`CREATE DATABASE test`); err != nil {
		t.Fatal(err)
	}
	expectedCounter++

	// Check keys again.
	// descriptor ID counter.
	if ir, err := kvDB.Get(keys.DescIDGenerator); err != nil {
		t.Fatal(err)
	} else if actual := ir.ValueInt(); actual != expectedCounter {
		t.Fatalf("expected descriptor ID == %d, got %d", expectedCounter, actual)
	}

	// Database name.
	if gr, err := kvDB.Get(nameKey); err != nil {
		t.Fatal(err)
	} else if !gr.Exists() {
		t.Fatal("key is missing")
	}

	// database descriptor.
	if gr, err := kvDB.Get(dbDescKey); err != nil {
		t.Fatal(err)
	} else if !gr.Exists() {
		t.Fatal("key is missing")
	}

	// Now try to create it again. We should fail, but not increment the counter.
	if _, err := sqlDB.Exec(`CREATE DATABASE test`); err == nil {
		t.Fatal("failure expected")
	}

	// Check keys again.
	// descriptor ID counter.
	if ir, err := kvDB.Get(keys.DescIDGenerator); err != nil {
		t.Fatal(err)
	} else if actual := ir.ValueInt(); actual != expectedCounter {
		t.Fatalf("expected descriptor ID == %d, got %d", expectedCounter, actual)
	}

	// Database name.
	if gr, err := kvDB.Get(nameKey); err != nil {
		t.Fatal(err)
	} else if !gr.Exists() {
		t.Fatal("key is missing")
	}

	// database descriptor.
	if gr, err := kvDB.Get(dbDescKey); err != nil {
		t.Fatal(err)
	} else if !gr.Exists() {
		t.Fatal("key is missing")
	}
}
Esempio n. 6
0
func TestDatabaseDescriptor(t *testing.T) {
	defer leaktest.AfterTest(t)
	s, sqlDB, kvDB := setup(t)
	defer cleanup(s, sqlDB)

	// The first `MaxReservedDescID` (plus 0) are set aside.
	expectedCounter := int64(structured.MaxReservedDescID + 1)

	// Test values before creating the database.
	// descriptor ID counter.
	if ir, err := kvDB.Get(keys.DescIDGenerator); err != nil {
		t.Fatal(err)
	} else if ir.ValueInt() != expectedCounter {
		t.Fatalf("expected descriptor ID == %d, got %d", expectedCounter, ir.ValueInt())
	}

	// Database name.
	nameKey := structured.MakeNameMetadataKey(structured.RootNamespaceID, "test")
	if gr, err := kvDB.Get(nameKey); err != nil {
		t.Fatal(err)
	} else if gr.Exists() {
		t.Fatal("expected non-existing key")
	}

	if _, err := sqlDB.Exec(`CREATE DATABASE test`); err != nil {
		t.Fatal(err)
	}
	expectedCounter++

	// Check keys again.
	// descriptor ID counter.
	if ir, err := kvDB.Get(keys.DescIDGenerator); err != nil {
		t.Fatal(err)
	} else if ir.ValueInt() != expectedCounter {
		t.Fatalf("expected descriptor ID == %d, got %d", expectedCounter, ir.ValueInt())
	}

	// Database name.
	if gr, err := kvDB.Get(nameKey); err != nil {
		t.Fatal(err)
	} else if !gr.Exists() {
		t.Fatal("key is missing")
	}

	// database descriptor.
	descKey := structured.MakeDescMetadataKey(structured.ID(expectedCounter - 1))
	if gr, err := kvDB.Get(descKey); err != nil {
		t.Fatal(err)
	} else if !gr.Exists() {
		t.Fatal("key is missing")
	}

	// Now try to create it again. We should fail, but not increment the counter.
	if _, err := sqlDB.Exec(`CREATE DATABASE test`); err == nil {
		t.Fatal("failure expected")
	}

	// Check keys again.
	// descriptor ID counter.
	if ir, err := kvDB.Get(keys.DescIDGenerator); err != nil {
		t.Fatal(err)
	} else if ir.ValueInt() != expectedCounter {
		t.Fatalf("expected descriptor ID == %d, got %d", expectedCounter, ir.ValueInt())
	}

	// Database name.
	if gr, err := kvDB.Get(nameKey); err != nil {
		t.Fatal(err)
	} else if !gr.Exists() {
		t.Fatal("key is missing")
	}

	// database descriptor.
	if gr, err := kvDB.Get(descKey); err != nil {
		t.Fatal(err)
	} else if !gr.Exists() {
		t.Fatal("key is missing")
	}
}
Esempio n. 7
0
func TestDropTable(t *testing.T) {
	defer leaktest.AfterTest(t)
	s, sqlDB, kvDB := setup(t)
	defer cleanup(s, sqlDB)

	if _, err := sqlDB.Exec("CREATE DATABASE t"); err != nil {
		t.Fatal(err)
	}

	if _, err := sqlDB.Exec("CREATE TABLE t.kv (k CHAR PRIMARY KEY, v CHAR)"); err != nil {
		t.Fatal(err)
	}

	if _, err := sqlDB.Exec(`INSERT INTO t.kv VALUES ('c', 'e'), ('a', 'c'),('b', 'd')`); err != nil {
		t.Fatal(err)
	}

	// The first `MaxReservedDescID` (plus 0) are set aside.
	expectedDBCounter := uint32(structured.MaxReservedDescID + 1)
	nameKey := structured.MakeNameMetadataKey(structured.ID(expectedDBCounter), "kv")
	gr, err := kvDB.Get(nameKey)
	if err != nil {
		t.Fatal(err)
	}

	if !gr.Exists() {
		t.Fatalf("TableDescriptor %q does not exist", nameKey)
	}

	descKey := gr.ValueBytes()
	desc := structured.TableDescriptor{}
	if err := kvDB.GetProto(descKey, &desc); err != nil {
		t.Fatal(err)
	}

	var tablePrefix []byte
	tablePrefix = append(tablePrefix, keys.TableDataPrefix...)
	tablePrefix = encoding.EncodeUvarint(tablePrefix, uint64(desc.ID))

	tableStartKey := proto.Key(tablePrefix)
	tableEndKey := tableStartKey.PrefixEnd()
	if kvs, err := kvDB.Scan(tableStartKey, tableEndKey, 0); err != nil {
		t.Fatal(err)
	} else if l := 6; len(kvs) != l {
		t.Fatalf("expected %d key value pairs, but got %d", l, len(kvs))
	}

	if _, err := sqlDB.Exec("DROP TABLE t.kv"); err != nil {
		t.Fatal(err)
	}

	if kvs, err := kvDB.Scan(tableStartKey, tableEndKey, 0); err != nil {
		t.Fatal(err)
	} else if l := 0; len(kvs) != l {
		t.Fatalf("expected %d key value pairs, but got %d", l, len(kvs))
	}

	if gr, err := kvDB.Get(descKey); err != nil {
		t.Fatal(err)
	} else if gr.Exists() {
		t.Fatalf("table descriptor still exists after the table is dropped")
	}

	if gr, err := kvDB.Get(nameKey); err != nil {
		t.Fatal(err)
	} else if gr.Exists() {
		t.Fatalf("table namekey still exists after the table is dropped")
	}
}