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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 zktopo
import (
"encoding/json"
"fmt"
"sort"
"github.com/youtube/vitess/go/vt/topo"
"github.com/youtube/vitess/go/vt/topo/topoproto"
"github.com/youtube/vitess/go/zk"
"golang.org/x/net/context"
"launchpad.net/gozk/zookeeper"
pb "github.com/youtube/vitess/go/vt/proto/topodata"
)
/*
This file contains the tablet management parts of zktopo.Server
*/
// TabletPathForAlias converts a tablet alias to the zk path
func TabletPathForAlias(alias *pb.TabletAlias) string {
return fmt.Sprintf("/zk/%v/vt/tablets/%v", alias.Cell, topoproto.TabletAliasUIDStr(alias))
}
func tabletDirectoryForCell(cell string) string {
return fmt.Sprintf("/zk/%v/vt/tablets", cell)
}
// CreateTablet is part of the topo.Server interface
func (zkts *Server) CreateTablet(ctx context.Context, tablet *pb.Tablet) error {
zkTabletPath := TabletPathForAlias(tablet.Alias)
data, err := json.MarshalIndent(tablet, " ", " ")
if err != nil {
return err
}
// Create /zk/<cell>/vt/tablets/<uid>
_, err = zk.CreateRecursive(zkts.zconn, zkTabletPath, string(data), 0, zookeeper.WorldACL(zookeeper.PERM_ALL))
if err != nil {
if zookeeper.IsError(err, zookeeper.ZNODEEXISTS) {
err = topo.ErrNodeExists
}
return err
}
return nil
}
// UpdateTablet is part of the topo.Server interface
func (zkts *Server) UpdateTablet(ctx context.Context, tablet *pb.Tablet, existingVersion int64) (int64, error) {
zkTabletPath := TabletPathForAlias(tablet.Alias)
data, err := json.MarshalIndent(tablet, " ", " ")
if err != nil {
return 0, err
}
stat, err := zkts.zconn.Set(zkTabletPath, string(data), int(existingVersion))
if err != nil {
if zookeeper.IsError(err, zookeeper.ZBADVERSION) {
err = topo.ErrBadVersion
} else if zookeeper.IsError(err, zookeeper.ZNONODE) {
err = topo.ErrNoNode
}
return 0, err
}
return int64(stat.Version()), nil
}
// UpdateTabletFields is part of the topo.Server interface
func (zkts *Server) UpdateTabletFields(ctx context.Context, tabletAlias *pb.TabletAlias, update func(*pb.Tablet) error) (*pb.Tablet, error) {
// Store the last tablet value so we can log it if the change succeeds.
var lastTablet *pb.Tablet
zkTabletPath := TabletPathForAlias(tabletAlias)
f := func(oldValue string, oldStat zk.Stat) (string, error) {
if oldValue == "" {
return "", fmt.Errorf("no data for tablet addr update: %v", tabletAlias)
}
tablet := &pb.Tablet{}
if err := json.Unmarshal([]byte(oldValue), tablet); err != nil {
return "", err
}
if err := update(tablet); err != nil {
return "", err
}
lastTablet = tablet
data, err := json.MarshalIndent(tablet, "", " ")
if err != nil {
return "", err
}
return string(data), nil
}
err := zkts.zconn.RetryChange(zkTabletPath, 0, zookeeper.WorldACL(zookeeper.PERM_ALL), f)
if err != nil {
if zookeeper.IsError(err, zookeeper.ZNONODE) {
err = topo.ErrNoNode
}
return nil, err
}
return lastTablet, nil
}
// DeleteTablet is part of the topo.Server interface
func (zkts *Server) DeleteTablet(ctx context.Context, alias *pb.TabletAlias) error {
zkTabletPath := TabletPathForAlias(alias)
if err := zk.DeleteRecursive(zkts.zconn, zkTabletPath, -1); err != nil {
if zookeeper.IsError(err, zookeeper.ZNONODE) {
err = topo.ErrNoNode
}
return err
}
return nil
}
// GetTablet is part of the topo.Server interface
func (zkts *Server) GetTablet(ctx context.Context, alias *pb.TabletAlias) (*pb.Tablet, int64, error) {
zkTabletPath := TabletPathForAlias(alias)
data, stat, err := zkts.zconn.Get(zkTabletPath)
if err != nil {
if zookeeper.IsError(err, zookeeper.ZNONODE) {
err = topo.ErrNoNode
}
return nil, 0, err
}
tablet := &pb.Tablet{}
if err := json.Unmarshal([]byte(data), tablet); err != nil {
return nil, 0, err
}
return tablet, int64(stat.Version()), nil
}
// GetTabletsByCell is part of the topo.Server interface
func (zkts *Server) GetTabletsByCell(ctx context.Context, cell string) ([]*pb.TabletAlias, error) {
zkTabletsPath := tabletDirectoryForCell(cell)
children, _, err := zkts.zconn.Children(zkTabletsPath)
if err != nil {
if zookeeper.IsError(err, zookeeper.ZNONODE) {
err = topo.ErrNoNode
}
return nil, err
}
sort.Strings(children)
result := make([]*pb.TabletAlias, len(children))
for i, child := range children {
uid, err := topoproto.ParseUID(child)
if err != nil {
return nil, err
}
result[i] = &pb.TabletAlias{
Cell: cell,
Uid: uid,
}
}
return result, nil
}