serving_graph.go

// Copyright 2014, Google Inc. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

package etcdtopo

import (
	"encoding/json"
	"fmt"

	"golang.org/x/net/context"

	topodatapb "github.com/youtube/vitess/go/vt/proto/topodata"
	vschemapb "github.com/youtube/vitess/go/vt/proto/vschema"
	"github.com/youtube/vitess/go/vt/topo"
)

// GetSrvKeyspaceNames implements topo.Server.
func (s *Server) GetSrvKeyspaceNames(ctx context.Context, cellName string) ([]string, error) {
	cell, err := s.getCell(cellName)
	if err != nil {
		return nil, err
	}

	resp, err := cell.Get(servingDirPath, true /* sort */, false /* recursive */)
	if err != nil {
		err = convertError(err)
		if err == topo.ErrNoNode {
			return nil, nil
		}
		return nil, err
	}
	return getNodeNames(resp)
}

// UpdateSrvKeyspace implements topo.Server.
func (s *Server) UpdateSrvKeyspace(ctx context.Context, cellName, keyspace string, srvKeyspace *topodatapb.SrvKeyspace) error {
	cell, err := s.getCell(cellName)
	if err != nil {
		return err
	}

	data, err := json.MarshalIndent(srvKeyspace, "", "  ")
	if err != nil {
		return err
	}

	_, err = cell.Set(srvKeyspaceFilePath(keyspace), string(data), 0 /* ttl */)
	return convertError(err)
}

// DeleteSrvKeyspace implements topo.Server.
func (s *Server) DeleteSrvKeyspace(ctx context.Context, cellName, keyspace string) error {
	cell, err := s.getCell(cellName)
	if err != nil {
		return err
	}

	_, err = cell.Delete(srvKeyspaceDirPath(keyspace), true /* recursive */)
	return convertError(err)
}

// GetSrvKeyspace implements topo.Server.
func (s *Server) GetSrvKeyspace(ctx context.Context, cellName, keyspace string) (*topodatapb.SrvKeyspace, error) {
	cell, err := s.getCell(cellName)
	if err != nil {
		return nil, err
	}

	resp, err := cell.Get(srvKeyspaceFilePath(keyspace), false /* sort */, false /* recursive */)
	if err != nil {
		return nil, convertError(err)
	}
	if resp.Node == nil {
		return nil, ErrBadResponse
	}

	value := &topodatapb.SrvKeyspace{}
	if err := json.Unmarshal([]byte(resp.Node.Value), value); err != nil {
		return nil, fmt.Errorf("bad serving keyspace data (%v): %q", err, resp.Node.Value)
	}
	return value, nil
}

// UpdateSrvVSchema implements topo.Server.
func (s *Server) UpdateSrvVSchema(ctx context.Context, cellName string, srvVSchema *vschemapb.SrvVSchema) error {
	cell, err := s.getCell(cellName)
	if err != nil {
		return err
	}

	data, err := json.MarshalIndent(srvVSchema, "", "  ")
	if err != nil {
		return err
	}

	_, err = cell.Set(srvVSchemaFilePath(), string(data), 0 /* ttl */)
	return convertError(err)
}

// GetSrvVSchema implements topo.Server.
func (s *Server) GetSrvVSchema(ctx context.Context, cellName string) (*vschemapb.SrvVSchema, error) {
	cell, err := s.getCell(cellName)
	if err != nil {
		return nil, err
	}

	resp, err := cell.Get(srvVSchemaFilePath(), false /* sort */, false /* recursive */)
	if err != nil {
		return nil, convertError(err)
	}
	if resp.Node == nil {
		return nil, ErrBadResponse
	}

	value := &vschemapb.SrvVSchema{}
	if err := json.Unmarshal([]byte(resp.Node.Value), value); err != nil {
		return nil, fmt.Errorf("bad serving vschema data (%v): %q", err, resp.Node.Value)
	}
	return value, nil
}