gitea/vendor/github.com/go-macaron/session/nodb/nodb.go

209 lines
4.7 KiB
Go

// Copyright 2015 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"
"sync"
"github.com/lunny/nodb"
"github.com/lunny/nodb/config"
"github.com/go-macaron/session"
)
// NodbStore represents a nodb session store implementation.
type NodbStore struct {
c *nodb.DB
sid string
expire int64
lock sync.RWMutex
data map[interface{}]interface{}
}
// NewNodbStore creates and returns a ledis session store.
func NewNodbStore(c *nodb.DB, sid string, expire int64, kv map[interface{}]interface{}) *NodbStore {
return &NodbStore{
c: c,
expire: expire,
sid: sid,
data: kv,
}
}
// Set sets value to given key in session.
func (s *NodbStore) 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 *NodbStore) Get(key interface{}) interface{} {
s.lock.RLock()
defer s.lock.RUnlock()
return s.data[key]
}
// Delete delete a key from session.
func (s *NodbStore) Delete(key interface{}) error {
s.lock.Lock()
defer s.lock.Unlock()
delete(s.data, key)
return nil
}
// ID returns current session ID.
func (s *NodbStore) ID() string {
return s.sid
}
// Release releases resource and save data to provider.
func (s *NodbStore) 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
}
if err = s.c.Set([]byte(s.sid), data); err != nil {
return err
}
_, err = s.c.Expire([]byte(s.sid), s.expire)
return err
}
// Flush deletes all session data.
func (s *NodbStore) Flush() error {
s.lock.Lock()
defer s.lock.Unlock()
s.data = make(map[interface{}]interface{})
return nil
}
// NodbProvider represents a ledis session provider implementation.
type NodbProvider struct {
c *nodb.DB
expire int64
}
// Init initializes nodb session provider.
func (p *NodbProvider) Init(expire int64, configs string) error {
p.expire = expire
cfg := new(config.Config)
cfg.DataDir = configs
dbs, err := nodb.Open(cfg)
if err != nil {
return fmt.Errorf("session/nodb: error opening db: %v", err)
}
p.c, err = dbs.Select(0)
return err
}
// Read returns raw session store by session ID.
func (p *NodbProvider) Read(sid string) (session.RawStore, error) {
if !p.Exist(sid) {
if err := p.c.Set([]byte(sid), []byte("")); err != nil {
return nil, err
}
}
var kv map[interface{}]interface{}
kvs, err := p.c.Get([]byte(sid))
if err != nil {
return nil, err
}
if len(kvs) == 0 {
kv = make(map[interface{}]interface{})
} else {
kv, err = session.DecodeGob(kvs)
if err != nil {
return nil, err
}
}
return NewNodbStore(p.c, sid, p.expire, kv), nil
}
// Exist returns true if session with given ID exists.
func (p *NodbProvider) Exist(sid string) bool {
count, err := p.c.Exists([]byte(sid))
return err == nil && count > 0
}
// Destory deletes a session by session ID.
func (p *NodbProvider) Destory(sid string) error {
_, err := p.c.Del([]byte(sid))
return err
}
// Regenerate regenerates a session store from old session ID to new one.
func (p *NodbProvider) Regenerate(oldsid, sid string) (_ session.RawStore, err error) {
if p.Exist(sid) {
return nil, fmt.Errorf("new sid '%s' already exists", sid)
}
kvs := make([]byte, 0)
if p.Exist(oldsid) {
if kvs, err = p.c.Get([]byte(oldsid)); err != nil {
return nil, err
} else if _, err = p.c.Del([]byte(oldsid)); err != nil {
return nil, err
}
}
if err = p.c.Set([]byte(sid), kvs); err != nil {
return nil, err
} else if _, err = p.c.Expire([]byte(sid), p.expire); err != nil {
return nil, err
}
var kv map[interface{}]interface{}
if len(kvs) == 0 {
kv = make(map[interface{}]interface{})
} else {
kv, err = session.DecodeGob([]byte(kvs))
if err != nil {
return nil, err
}
}
return NewNodbStore(p.c, sid, p.expire, kv), nil
}
// Count counts and returns number of sessions.
func (p *NodbProvider) Count() int {
// FIXME: how come this library does not have DbSize() method?
return -1
}
// GC calls GC to clean expired sessions.
func (p *NodbProvider) GC() {}
func init() {
session.Register("nodb", &NodbProvider{})
}