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tablet.go
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tablet.go
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// Copyright 2013, 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 zk2topo
import (
"path"
"github.com/golang/protobuf/proto"
"golang.org/x/net/context"
"github.com/youtube/vitess/go/vt/topo"
"github.com/youtube/vitess/go/vt/topo/topoproto"
topodatapb "github.com/youtube/vitess/go/vt/proto/topodata"
)
// This file contains the tablet management parts of zktopo.Server.
// Eventually this will be moved to the go/vt/topo package.
// tabletPathForAlias converts a tablet alias to the zk path.
func tabletPathForAlias(alias *topodatapb.TabletAlias) string {
return path.Join(tabletsPath, topoproto.TabletAliasString(alias), topo.TabletFile)
}
// CreateTablet is part of the topo.Server interface
func (zs *Server) CreateTablet(ctx context.Context, tablet *topodatapb.Tablet) error {
data, err := proto.Marshal(tablet)
if err != nil {
return err
}
zkPath := tabletPathForAlias(tablet.Alias)
_, err = zs.Create(ctx, tablet.Alias.Cell, zkPath, data)
return err
}
// UpdateTablet is part of the topo.Server interface
func (zs *Server) UpdateTablet(ctx context.Context, tablet *topodatapb.Tablet, existingVersion int64) (int64, error) {
data, err := proto.Marshal(tablet)
if err != nil {
return 0, err
}
zkPath := tabletPathForAlias(tablet.Alias)
version, err := zs.Update(ctx, tablet.Alias.Cell, zkPath, data, ZKVersion(existingVersion))
if err != nil {
return 0, err
}
return int64(version.(ZKVersion)), nil
}
// DeleteTablet is part of the topo.Server interface
func (zs *Server) DeleteTablet(ctx context.Context, alias *topodatapb.TabletAlias) error {
zkPath := tabletPathForAlias(alias)
return zs.Delete(ctx, alias.Cell, zkPath, nil)
}
// GetTablet is part of the topo.Server interface
func (zs *Server) GetTablet(ctx context.Context, alias *topodatapb.TabletAlias) (*topodatapb.Tablet, int64, error) {
zkPath := tabletPathForAlias(alias)
data, version, err := zs.Get(ctx, alias.Cell, zkPath)
if err != nil {
return nil, 0, err
}
tablet := &topodatapb.Tablet{}
if err := proto.Unmarshal(data, tablet); err != nil {
return nil, 0, err
}
return tablet, int64(version.(ZKVersion)), nil
}
// GetTabletsByCell is part of the topo.Server interface
func (zs *Server) GetTabletsByCell(ctx context.Context, cell string) ([]*topodatapb.TabletAlias, error) {
children, err := zs.ListDir(ctx, cell, tabletsPath)
if err != nil {
return nil, err
}
result := make([]*topodatapb.TabletAlias, len(children))
for i, child := range children {
result[i], err = topoproto.ParseTabletAlias(child)
if err != nil {
return nil, err
}
}
return result, nil
}