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tablet.go
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tablet.go
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// 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"
"github.com/youtube/vitess/go/vt/topo"
"github.com/youtube/vitess/go/vt/topo/topoproto"
"golang.org/x/net/context"
pb "github.com/youtube/vitess/go/vt/proto/topodata"
)
// CreateTablet implements topo.Server.
func (s *Server) CreateTablet(ctx context.Context, tablet *pb.Tablet) error {
cell, err := s.getCell(tablet.Alias.Cell)
if err != nil {
return err
}
data, err := json.MarshalIndent(tablet, "", " ")
if err != nil {
return err
}
_, err = cell.Create(tabletFilePath(tablet.Alias), string(data), 0 /* ttl */)
if err != nil {
return convertError(err)
}
return nil
}
// UpdateTablet implements topo.Server.
func (s *Server) UpdateTablet(ctx context.Context, tablet *pb.Tablet, existingVersion int64) (int64, error) {
cell, err := s.getCell(tablet.Alias.Cell)
if err != nil {
return -1, err
}
data, err := json.MarshalIndent(tablet, "", " ")
if err != nil {
return -1, err
}
resp, err := cell.CompareAndSwap(tabletFilePath(tablet.Alias),
string(data), 0 /* ttl */, "" /* prevValue */, uint64(existingVersion))
if err != nil {
return -1, convertError(err)
}
if resp.Node == nil {
return -1, ErrBadResponse
}
return int64(resp.Node.ModifiedIndex), nil
}
// UpdateTabletFields implements topo.Server.
func (s *Server) UpdateTabletFields(ctx context.Context, tabletAlias *pb.TabletAlias, updateFunc func(*pb.Tablet) error) (*pb.Tablet, error) {
var tablet *pb.Tablet
var err error
for {
var version int64
if tablet, version, err = s.GetTablet(ctx, tabletAlias); err != nil {
return nil, err
}
if err = updateFunc(tablet); err != nil {
return nil, err
}
if _, err = s.UpdateTablet(ctx, tablet, version); err != topo.ErrBadVersion {
break
}
}
if err != nil {
return nil, err
}
return tablet, nil
}
// DeleteTablet implements topo.Server.
func (s *Server) DeleteTablet(ctx context.Context, tabletAlias *pb.TabletAlias) error {
cell, err := s.getCell(tabletAlias.Cell)
if err != nil {
return err
}
if _, err = cell.Delete(tabletDirPath(tabletAlias), true /* recursive */); err != nil {
return convertError(err)
}
return nil
}
// ValidateTablet implements topo.Server.
func (s *Server) ValidateTablet(ctx context.Context, tabletAlias *pb.TabletAlias) error {
_, _, err := s.GetTablet(ctx, tabletAlias)
return err
}
// GetTablet implements topo.Server.
func (s *Server) GetTablet(ctx context.Context, tabletAlias *pb.TabletAlias) (*pb.Tablet, int64, error) {
cell, err := s.getCell(tabletAlias.Cell)
if err != nil {
return nil, 0, err
}
resp, err := cell.Get(tabletFilePath(tabletAlias), false /* sort */, false /* recursive */)
if err != nil {
return nil, 0, convertError(err)
}
if resp.Node == nil {
return nil, 0, ErrBadResponse
}
value := &pb.Tablet{}
if err := json.Unmarshal([]byte(resp.Node.Value), value); err != nil {
return nil, 0, fmt.Errorf("bad tablet data (%v): %q", err, resp.Node.Value)
}
return value, int64(resp.Node.ModifiedIndex), nil
}
// GetTabletsByCell implements topo.Server.
func (s *Server) GetTabletsByCell(ctx context.Context, cellName string) ([]*pb.TabletAlias, error) {
cell, err := s.getCell(cellName)
if err != nil {
return nil, err
}
resp, err := cell.Get(tabletsDirPath, false /* sort */, false /* recursive */)
if err != nil {
return nil, convertError(err)
}
nodes, err := getNodeNames(resp)
if err != nil {
return nil, err
}
tablets := make([]*pb.TabletAlias, 0, len(nodes))
for _, node := range nodes {
tabletAlias, err := topoproto.ParseTabletAlias(node)
if err != nil {
return nil, err
}
tablets = append(tablets, tabletAlias)
}
return tablets, nil
}