/
keyspace.go
120 lines (96 loc) · 2.41 KB
/
keyspace.go
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package blobstore
import (
"fmt"
"os"
"sort"
"launchpad.net/gozk"
l4g "log4go.googlecode.com/hg"
)
type IKeySpace interface {
AddVnode(vnode IVnode) os.Error
RemoveVnode(vnode IVnode) os.Error
GetVnodes() (VnodeArray, os.Error)
Connect() os.Error
}
type KeySpace struct {
zkRoot string
zkServers string
zkTimeout int64
zk *gozk.ZooKeeper
}
func (k *KeySpace) GetVnodes() (VnodeArray, os.Error) {
ret := make(VnodeArray, 0)
children, _, err := k.zk.Children(k.zkRoot)
if err != nil {
return nil, err
}
for _, vstr := range children {
vn, err := NewVnodeFromString(vstr)
if err == nil {
ret = append(ret, vn)
} else {
return nil, err
}
}
sort.Sort(ret)
return ret, err
}
func (k *KeySpace) RemoveVnode(vnode IVnode) os.Error {
path := k.getVnodePath(vnode)
stat, err := k.zk.Exists(path)
if err != nil {
return err
}
if stat == nil {
// should we just ignore this case? ie, if you try to delete
// a vnode that doesn't exists, ignore?
return os.NewError(fmt.Sprintf("Node doesn't exist at %s.", path))
}
return k.zk.Delete(path, -1)
}
func (k *KeySpace) AddVnode(vnode IVnode) os.Error {
path := k.getVnodePath(vnode)
stat, err := k.zk.Exists(path)
if stat != nil {
return os.NewError(fmt.Sprintf("Node already exists at %s", path))
}
if err != nil {
return err
}
_, err = k.zk.Create(path, "0", 0, gozk.WorldACL(gozk.PERM_ALL))
return err
}
func NewKeySpace(rootNode string, servers string, timeoutInMillis int64) *KeySpace {
if rootNode == "" {
rootNode = "/blobstore.keyspace"
}
if servers == "" {
panic("KeySpace needs at least one server:port to connect to.")
}
return &KeySpace{zkRoot: rootNode, zkServers: servers, zkTimeout: timeoutInMillis * 1000}
}
func (k *KeySpace) Connect() os.Error {
zk, session, err := gozk.Init(k.zkServers, k.zkTimeout)
if err != nil {
return os.NewError("Couldn't connect: " + err.String())
}
event := <-session
if event.State != gozk.STATE_CONNECTED {
return os.NewError("Couldn't connect to zookeeper\n")
}
k.zk = zk
stat, err := k.zk.Exists(k.zkRoot)
if stat == nil {
path, err := k.zk.Create(k.zkRoot, "root", 0, gozk.WorldACL(gozk.PERM_ALL))
if err != nil {
l4g.Info("Created root node: %s\n", path)
}
}
return nil
}
func SetZooKeeperLogLevel(level int) {
gozk.SetLogLevel(level)
}
func (k *KeySpace) getVnodePath(vnode IVnode) string {
return fmt.Sprintf("%s/%s", k.zkRoot, vnode.String())
}