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acl.go
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acl.go
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package curator
import (
"github.com/samuel/go-zookeeper/zk"
)
var (
OPEN_ACL_UNSAFE = zk.WorldACL(zk.PermAll)
CREATOR_ALL_ACL = zk.AuthACL(zk.PermAll)
READ_ACL_UNSAFE = zk.WorldACL(zk.PermRead)
)
type ACLProvider interface {
// Return the ACL list to use by default
GetDefaultAcl() []zk.ACL
// Return the ACL list to use for the given path
GetAclForPath(path string) []zk.ACL
}
type defaultACLProvider struct {
defaultAcls []zk.ACL
}
func (p *defaultACLProvider) GetDefaultAcl() []zk.ACL {
return p.defaultAcls
}
func (p *defaultACLProvider) GetAclForPath(path string) []zk.ACL {
return p.defaultAcls
}
func NewDefaultACLProvider() ACLProvider {
return &defaultACLProvider{OPEN_ACL_UNSAFE}
}
type acling struct {
aclList []zk.ACL
aclProvider ACLProvider
}
func (a *acling) getAclList(path string) []zk.ACL {
if a.aclList != nil {
return a.aclList
}
if len(path) > 0 {
if acls := a.aclProvider.GetAclForPath(path); acls != nil {
return acls
}
}
return a.aclProvider.GetDefaultAcl()
}
type getACLBuilder struct {
client *curatorFramework
backgrounding backgrounding
stat *zk.Stat
}
func (b *getACLBuilder) ForPath(givenPath string) ([]zk.ACL, error) {
adjustedPath := b.client.fixForNamespace(givenPath, false)
if b.backgrounding.inBackground {
go b.pathInBackground(adjustedPath, givenPath)
return nil, nil
} else {
return b.pathInForeground(adjustedPath)
}
}
func (b *getACLBuilder) pathInBackground(path string, givenPath string) {
tracer := b.client.ZookeeperClient().StartTracer("getACLBuilder.pathInBackground")
defer tracer.Commit()
acls, err := b.pathInForeground(path)
if b.backgrounding.callback != nil {
event := &curatorEvent{
eventType: GET_ACL,
err: err,
path: b.client.unfixForNamespace(path),
acls: acls,
stat: b.stat,
context: b.backgrounding.context,
}
if err != nil {
event.path = givenPath
}
event.name = GetNodeFromPath(event.path)
b.backgrounding.callback(b.client, event)
}
}
func (b *getACLBuilder) pathInForeground(path string) ([]zk.ACL, error) {
zkClient := b.client.ZookeeperClient()
result, err := zkClient.NewRetryLoop().CallWithRetry(func() (interface{}, error) {
if conn, err := zkClient.Conn(); err != nil {
return nil, err
} else {
acls, stat, err := conn.GetACL(path)
if stat != nil {
if b.stat != nil {
*b.stat = *stat
} else {
b.stat = stat
}
}
return acls, err
}
})
acls, _ := result.([]zk.ACL)
return acls, err
}
func (b *getACLBuilder) StoringStatIn(stat *zk.Stat) GetACLBuilder {
b.stat = stat
return b
}
func (b *getACLBuilder) InBackground() GetACLBuilder {
b.backgrounding = backgrounding{inBackground: true}
return b
}
func (b *getACLBuilder) InBackgroundWithContext(context interface{}) GetACLBuilder {
b.backgrounding = backgrounding{inBackground: true, context: context}
return b
}
func (b *getACLBuilder) InBackgroundWithCallback(callback BackgroundCallback) GetACLBuilder {
b.backgrounding = backgrounding{inBackground: true, callback: callback}
return b
}
func (b *getACLBuilder) InBackgroundWithCallbackAndContext(callback BackgroundCallback, context interface{}) GetACLBuilder {
b.backgrounding = backgrounding{inBackground: true, context: context, callback: callback}
return b
}
type setACLBuilder struct {
client *curatorFramework
backgrounding backgrounding
acling acling
version int32
}
func (b *setACLBuilder) ForPath(givenPath string) (*zk.Stat, error) {
adjustedPath := b.client.fixForNamespace(givenPath, false)
if b.backgrounding.inBackground {
go b.pathInBackground(adjustedPath, givenPath)
return nil, nil
} else {
return b.pathInForeground(adjustedPath)
}
}
func (b *setACLBuilder) pathInBackground(path string, givenPath string) {
tracer := b.client.ZookeeperClient().StartTracer("setACLBuilder.pathInBackground")
defer tracer.Commit()
stat, err := b.pathInForeground(path)
if b.backgrounding.callback != nil {
event := &curatorEvent{
eventType: SET_ACL,
err: err,
path: b.client.unfixForNamespace(path),
acls: b.acling.getAclList(path),
stat: stat,
context: b.backgrounding.context,
}
if err != nil {
event.path = givenPath
}
event.name = GetNodeFromPath(event.path)
b.backgrounding.callback(b.client, event)
}
}
func (b *setACLBuilder) pathInForeground(path string) (*zk.Stat, error) {
zkClient := b.client.ZookeeperClient()
result, err := zkClient.NewRetryLoop().CallWithRetry(func() (interface{}, error) {
if conn, err := zkClient.Conn(); err != nil {
return nil, err
} else {
return conn.SetACL(path, b.acling.getAclList(path), b.version)
}
})
stat, _ := result.(*zk.Stat)
return stat, err
}
func (b *setACLBuilder) WithACL(acls ...zk.ACL) SetACLBuilder {
b.acling.aclList = acls
return b
}
func (b *setACLBuilder) WithVersion(version int32) SetACLBuilder {
b.version = version
return b
}
func (b *setACLBuilder) InBackground() SetACLBuilder {
b.backgrounding = backgrounding{inBackground: true}
return b
}
func (b *setACLBuilder) InBackgroundWithContext(context interface{}) SetACLBuilder {
b.backgrounding = backgrounding{inBackground: true, context: context}
return b
}
func (b *setACLBuilder) InBackgroundWithCallback(callback BackgroundCallback) SetACLBuilder {
b.backgrounding = backgrounding{inBackground: true, callback: callback}
return b
}
func (b *setACLBuilder) InBackgroundWithCallbackAndContext(callback BackgroundCallback, context interface{}) SetACLBuilder {
b.backgrounding = backgrounding{inBackground: true, context: context, callback: callback}
return b
}