githaven-fork/vendor/gitea.com/macaron/session/memcache/memcache.go

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// Copyright 2013 Beego Authors
// Copyright 2014 The Macaron Authors
//
// 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 session
import (
"fmt"
"strings"
"sync"
"gitea.com/macaron/session"
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"github.com/bradfitz/gomemcache/memcache"
)
// MemcacheStore represents a memcache session store implementation.
type MemcacheStore struct {
c *memcache.Client
sid string
expire int32
lock sync.RWMutex
data map[interface{}]interface{}
}
// NewMemcacheStore creates and returns a memcache session store.
func NewMemcacheStore(c *memcache.Client, sid string, expire int32, kv map[interface{}]interface{}) *MemcacheStore {
return &MemcacheStore{
c: c,
sid: sid,
expire: expire,
data: kv,
}
}
func NewItem(sid string, data []byte, expire int32) *memcache.Item {
return &memcache.Item{
Key: sid,
Value: data,
Expiration: expire,
}
}
// Set sets value to given key in session.
func (s *MemcacheStore) Set(key, val interface{}) error {
s.lock.Lock()
defer s.lock.Unlock()
s.data[key] = val
return nil
}
// Get gets value by given key in session.
func (s *MemcacheStore) Get(key interface{}) interface{} {
s.lock.RLock()
defer s.lock.RUnlock()
return s.data[key]
}
// Delete delete a key from session.
func (s *MemcacheStore) Delete(key interface{}) error {
s.lock.Lock()
defer s.lock.Unlock()
delete(s.data, key)
return nil
}
// ID returns current session ID.
func (s *MemcacheStore) ID() string {
return s.sid
}
// Release releases resource and save data to provider.
func (s *MemcacheStore) Release() error {
// Skip encoding if the data is empty
if len(s.data) == 0 {
return nil
}
data, err := session.EncodeGob(s.data)
if err != nil {
return err
}
return s.c.Set(NewItem(s.sid, data, s.expire))
}
// Flush deletes all session data.
func (s *MemcacheStore) Flush() error {
s.lock.Lock()
defer s.lock.Unlock()
s.data = make(map[interface{}]interface{})
return nil
}
// MemcacheProvider represents a memcache session provider implementation.
type MemcacheProvider struct {
c *memcache.Client
expire int32
}
// Init initializes memcache session provider.
// connStrs: 127.0.0.1:9090;127.0.0.1:9091
func (p *MemcacheProvider) Init(expire int64, connStrs string) error {
p.expire = int32(expire)
p.c = memcache.New(strings.Split(connStrs, ";")...)
return nil
}
// Read returns raw session store by session ID.
func (p *MemcacheProvider) Read(sid string) (session.RawStore, error) {
if !p.Exist(sid) {
if err := p.c.Set(NewItem(sid, []byte(""), p.expire)); err != nil {
return nil, err
}
}
var kv map[interface{}]interface{}
item, err := p.c.Get(sid)
if err != nil {
return nil, err
}
if len(item.Value) == 0 {
kv = make(map[interface{}]interface{})
} else {
kv, err = session.DecodeGob(item.Value)
if err != nil {
return nil, err
}
}
return NewMemcacheStore(p.c, sid, p.expire, kv), nil
}
// Exist returns true if session with given ID exists.
func (p *MemcacheProvider) Exist(sid string) bool {
_, err := p.c.Get(sid)
return err == nil
}
// Destroy deletes a session by session ID.
func (p *MemcacheProvider) Destroy(sid string) error {
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return p.c.Delete(sid)
}
// Regenerate regenerates a session store from old session ID to new one.
func (p *MemcacheProvider) Regenerate(oldsid, sid string) (_ session.RawStore, err error) {
if p.Exist(sid) {
return nil, fmt.Errorf("new sid '%s' already exists", sid)
}
item := NewItem(sid, []byte(""), p.expire)
if p.Exist(oldsid) {
item, err = p.c.Get(oldsid)
if err != nil {
return nil, err
} else if err = p.c.Delete(oldsid); err != nil {
return nil, err
}
item.Key = sid
}
if err = p.c.Set(item); err != nil {
return nil, err
}
var kv map[interface{}]interface{}
if len(item.Value) == 0 {
kv = make(map[interface{}]interface{})
} else {
kv, err = session.DecodeGob(item.Value)
if err != nil {
return nil, err
}
}
return NewMemcacheStore(p.c, sid, p.expire, kv), nil
}
// Count counts and returns number of sessions.
func (p *MemcacheProvider) Count() int {
// FIXME: how come this library does not have Stats method?
return -1
}
// GC calls GC to clean expired sessions.
func (p *MemcacheProvider) GC() {}
func init() {
session.Register("memcache", &MemcacheProvider{})
}