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209 lines
4.7 KiB
Go
209 lines
4.7 KiB
Go
6 years ago
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// Copyright 2015 The Macaron Authors
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//
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// Licensed under the Apache License, Version 2.0 (the "License"): you may
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// not use this file except in compliance with the License. You may obtain
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// a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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// WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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// License for the specific language governing permissions and limitations
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// under the License.
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package session
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import (
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"fmt"
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"sync"
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"github.com/lunny/nodb"
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"github.com/lunny/nodb/config"
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"github.com/go-macaron/session"
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)
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// NodbStore represents a nodb session store implementation.
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type NodbStore struct {
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c *nodb.DB
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sid string
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expire int64
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lock sync.RWMutex
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data map[interface{}]interface{}
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}
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// NewNodbStore creates and returns a ledis session store.
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func NewNodbStore(c *nodb.DB, sid string, expire int64, kv map[interface{}]interface{}) *NodbStore {
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return &NodbStore{
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c: c,
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expire: expire,
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sid: sid,
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data: kv,
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}
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}
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// Set sets value to given key in session.
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func (s *NodbStore) Set(key, val interface{}) error {
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s.lock.Lock()
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defer s.lock.Unlock()
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s.data[key] = val
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return nil
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}
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// Get gets value by given key in session.
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func (s *NodbStore) Get(key interface{}) interface{} {
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s.lock.RLock()
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defer s.lock.RUnlock()
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return s.data[key]
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}
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// Delete delete a key from session.
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func (s *NodbStore) Delete(key interface{}) error {
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s.lock.Lock()
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defer s.lock.Unlock()
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delete(s.data, key)
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return nil
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}
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// ID returns current session ID.
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func (s *NodbStore) ID() string {
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return s.sid
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}
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// Release releases resource and save data to provider.
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func (s *NodbStore) Release() error {
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// Skip encoding if the data is empty
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if len(s.data) == 0 {
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return nil
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}
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data, err := session.EncodeGob(s.data)
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if err != nil {
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return err
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}
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if err = s.c.Set([]byte(s.sid), data); err != nil {
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return err
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}
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_, err = s.c.Expire([]byte(s.sid), s.expire)
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return err
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}
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// Flush deletes all session data.
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func (s *NodbStore) Flush() error {
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s.lock.Lock()
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defer s.lock.Unlock()
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s.data = make(map[interface{}]interface{})
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return nil
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}
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// NodbProvider represents a ledis session provider implementation.
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type NodbProvider struct {
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c *nodb.DB
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expire int64
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}
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// Init initializes nodb session provider.
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func (p *NodbProvider) Init(expire int64, configs string) error {
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p.expire = expire
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cfg := new(config.Config)
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cfg.DataDir = configs
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dbs, err := nodb.Open(cfg)
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if err != nil {
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return fmt.Errorf("session/nodb: error opening db: %v", err)
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}
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p.c, err = dbs.Select(0)
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return err
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}
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// Read returns raw session store by session ID.
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func (p *NodbProvider) Read(sid string) (session.RawStore, error) {
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if !p.Exist(sid) {
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if err := p.c.Set([]byte(sid), []byte("")); err != nil {
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return nil, err
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}
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}
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var kv map[interface{}]interface{}
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kvs, err := p.c.Get([]byte(sid))
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if err != nil {
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return nil, err
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}
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if len(kvs) == 0 {
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kv = make(map[interface{}]interface{})
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} else {
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kv, err = session.DecodeGob(kvs)
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if err != nil {
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return nil, err
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}
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}
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return NewNodbStore(p.c, sid, p.expire, kv), nil
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}
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// Exist returns true if session with given ID exists.
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func (p *NodbProvider) Exist(sid string) bool {
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count, err := p.c.Exists([]byte(sid))
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return err == nil && count > 0
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}
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// Destory deletes a session by session ID.
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func (p *NodbProvider) Destory(sid string) error {
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_, err := p.c.Del([]byte(sid))
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return err
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}
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// Regenerate regenerates a session store from old session ID to new one.
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func (p *NodbProvider) Regenerate(oldsid, sid string) (_ session.RawStore, err error) {
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if p.Exist(sid) {
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return nil, fmt.Errorf("new sid '%s' already exists", sid)
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}
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kvs := make([]byte, 0)
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if p.Exist(oldsid) {
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if kvs, err = p.c.Get([]byte(oldsid)); err != nil {
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return nil, err
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} else if _, err = p.c.Del([]byte(oldsid)); err != nil {
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return nil, err
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}
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}
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if err = p.c.Set([]byte(sid), kvs); err != nil {
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return nil, err
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} else if _, err = p.c.Expire([]byte(sid), p.expire); err != nil {
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return nil, err
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}
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var kv map[interface{}]interface{}
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if len(kvs) == 0 {
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kv = make(map[interface{}]interface{})
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} else {
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kv, err = session.DecodeGob([]byte(kvs))
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if err != nil {
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return nil, err
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}
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}
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return NewNodbStore(p.c, sid, p.expire, kv), nil
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}
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// Count counts and returns number of sessions.
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func (p *NodbProvider) Count() int {
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// FIXME: how come this library does not have DbSize() method?
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return -1
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}
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// GC calls GC to clean expired sessions.
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func (p *NodbProvider) GC() {}
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func init() {
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session.Register("nodb", &NodbProvider{})
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}
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