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// Copyright 2016 CoreOS, Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package zetcd
import (
"sync"
etcd "github.com/coreos/etcd/clientv3"
"github.com/golang/glog"
"golang.org/x/net/context"
)
type Session interface {
Conn
Watches
Sid() Sid
ZXid() ZXid
ConnReq() ConnectRequest
Backing() interface{}
}
type session struct {
Conn
*watches
id etcd.LeaseID
c *etcd.Client
req ConnectRequest
leaseZXid ZXid
mu sync.RWMutex
}
func (s *session) ConnReq() ConnectRequest { return s.req }
func (s *session) Backing() interface{} { return s }
func newSession(c *etcd.Client, zkc Conn, id etcd.LeaseID) (*session, error) {
ctx, cancel := context.WithCancel(c.Ctx())
s := &session{Conn: zkc, id: id, c: c, watches: newWatches(c)}
kach, kaerr := c.KeepAlive(ctx, id)
if kaerr != nil {
cancel()
return nil, kaerr
}
go func() {
glog.V(9).Infof("starting the session... id=%v", id)
defer func() {
glog.V(9).Infof("finishing the session... id=%v; expect revoke...", id)
cancel()
s.Close()
}()
for {
select {
case ka, ok := <-kach:
if !ok {
return
}
if ka.ResponseHeader == nil {
continue
}
s.mu.Lock()
s.leaseZXid = ZXid(ka.ResponseHeader.Revision)
s.mu.Unlock()
case <-s.StopNotify():
return
}
}
}()
return s, nil
}
func (s *session) Sid() Sid { return Sid(s.id) }
func (s *session) Close() {
s.watches.close()
s.Conn.Close()
}
// ZXid gets the lease ZXid
func (s *session) ZXid() ZXid {
s.mu.RLock()
zxid := s.leaseZXid
s.mu.RUnlock()
return zxid
}