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keyspace.go
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keyspace.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"
"path"
"sort"
zookeeper "github.com/samuel/go-zookeeper/zk"
"golang.org/x/net/context"
"github.com/youtube/vitess/go/vt/topo"
"github.com/youtube/vitess/go/zk"
topodatapb "github.com/youtube/vitess/go/vt/proto/topodata"
)
/*
This file contains the Keyspace management code for zktopo.Server
*/
const (
// GlobalKeyspacesPath is the path used to store global
// information in ZK. Exported for tests.
GlobalKeyspacesPath = "/zk/global/vt/keyspaces"
)
// CreateKeyspace is part of the topo.Server interface
func (zkts *Server) CreateKeyspace(ctx context.Context, keyspace string, value *topodatapb.Keyspace) error {
keyspacePath := path.Join(GlobalKeyspacesPath, keyspace)
pathList := []string{
keyspacePath,
path.Join(keyspacePath, "action"),
path.Join(keyspacePath, "actionlog"),
path.Join(keyspacePath, "shards"),
}
data, err := json.MarshalIndent(value, "", " ")
if err != nil {
return err
}
alreadyExists := false
for i, zkPath := range pathList {
var c []byte
if i == 0 {
c = data
}
_, err := zk.CreateRecursive(zkts.zconn, zkPath, c, 0, zookeeper.WorldACL(zookeeper.PermAll))
switch err {
case nil:
// nothing here
case zookeeper.ErrNodeExists:
alreadyExists = true
default:
return convertError(err)
}
}
if alreadyExists {
return topo.ErrNodeExists
}
return nil
}
// UpdateKeyspace is part of the topo.Server interface
func (zkts *Server) UpdateKeyspace(ctx context.Context, keyspace string, value *topodatapb.Keyspace, existingVersion int64) (int64, error) {
keyspacePath := path.Join(GlobalKeyspacesPath, keyspace)
data, err := json.MarshalIndent(value, "", " ")
if err != nil {
return -1, err
}
stat, err := zkts.zconn.Set(keyspacePath, data, int32(existingVersion))
if err != nil {
return -1, convertError(err)
}
return int64(stat.Version), nil
}
// DeleteKeyspace is part of the topo.Server interface.
func (zkts *Server) DeleteKeyspace(ctx context.Context, keyspace string) error {
keyspacePath := path.Join(GlobalKeyspacesPath, keyspace)
err := zk.DeleteRecursive(zkts.zconn, keyspacePath, -1)
if err != nil {
return convertError(err)
}
return nil
}
// GetKeyspace is part of the topo.Server interface
func (zkts *Server) GetKeyspace(ctx context.Context, keyspace string) (*topodatapb.Keyspace, int64, error) {
keyspacePath := path.Join(GlobalKeyspacesPath, keyspace)
data, stat, err := zkts.zconn.Get(keyspacePath)
if err != nil {
return nil, 0, convertError(err)
}
k := &topodatapb.Keyspace{}
if err = json.Unmarshal(data, k); err != nil {
return nil, 0, fmt.Errorf("bad keyspace data %v", err)
}
return k, int64(stat.Version), nil
}
// GetKeyspaces is part of the topo.Server interface
func (zkts *Server) GetKeyspaces(ctx context.Context) ([]string, error) {
children, _, err := zkts.zconn.Children(GlobalKeyspacesPath)
switch err {
case nil:
sort.Strings(children)
return children, nil
case zookeeper.ErrNoNode:
return nil, nil
default:
return nil, convertError(err)
}
}