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// Copyright 2019 The Gitea Authors. All rights reserved.
// Use of this source code is governed by a MIT-style
// license that can be found in the LICENSE file.
package session
import (
"container/list"
"encoding/json"
"fmt"
"sync"
"github.com/go-macaron/session"
couchbase "github.com/go-macaron/session/couchbase"
memcache "github.com/go-macaron/session/memcache"
mysql "github.com/go-macaron/session/mysql"
nodb "github.com/go-macaron/session/nodb"
postgres "github.com/go-macaron/session/postgres"
redis "github.com/go-macaron/session/redis"
)
// VirtualSessionProvider represents a shadowed session provider implementation.
type VirtualSessionProvider struct {
lock sync.RWMutex
provider session.Provider
}
// Init initializes the cookie session provider with given root path.
func (o *VirtualSessionProvider) Init(gclifetime int64, config string) error {
var opts session.Options
if err := json.Unmarshal([]byte(config), &opts); err != nil {
return err
}
// Note that these options are unprepared so we can't just use NewManager here.
// Nor can we access the provider map in session.
// So we will just have to do this by hand.
// This is only slightly more wrong than modules/setting/session.go:23
switch opts.Provider {
case "memory":
o.provider = &MemProvider{list: list.New(), data: make(map[string]*list.Element)}
case "file":
o.provider = &session.FileProvider{}
case "redis":
o.provider = &redis.RedisProvider{}
case "mysql":
o.provider = &mysql.MysqlProvider{}
case "postgres":
o.provider = &postgres.PostgresProvider{}
case "couchbase":
o.provider = &couchbase.CouchbaseProvider{}
case "memcache":
o.provider = &memcache.MemcacheProvider{}
case "nodb":
o.provider = &nodb.NodbProvider{}
default:
return fmt.Errorf("VirtualSessionProvider: Unknown Provider: %s", opts.Provider)
}
return o.provider.Init(gclifetime, opts.ProviderConfig)
}
// Read returns raw session store by session ID.
func (o *VirtualSessionProvider) Read(sid string) (session.RawStore, error) {
o.lock.RLock()
defer o.lock.RUnlock()
if o.provider.Exist(sid) {
return o.provider.Read(sid)
}
kv := make(map[interface{}]interface{})
kv["_old_uid"] = "0"
return NewVirtualStore(o, sid, kv), nil
}
// Exist returns true if session with given ID exists.
func (o *VirtualSessionProvider) Exist(sid string) bool {
return true
}
// Destory deletes a session by session ID.
func (o *VirtualSessionProvider) Destory(sid string) error {
o.lock.Lock()
defer o.lock.Unlock()
return o.provider.Destory(sid)
}
// Regenerate regenerates a session store from old session ID to new one.
func (o *VirtualSessionProvider) Regenerate(oldsid, sid string) (session.RawStore, error) {
o.lock.Lock()
defer o.lock.Unlock()
return o.provider.Regenerate(oldsid, sid)
}
// Count counts and returns number of sessions.
func (o *VirtualSessionProvider) Count() int {
o.lock.RLock()
defer o.lock.RUnlock()
return o.provider.Count()
}
// GC calls GC to clean expired sessions.
func (o *VirtualSessionProvider) GC() {
o.provider.GC()
}
func init() {
session.Register("VirtualSession", &VirtualSessionProvider{})
}
// VirtualStore represents a virtual session store implementation.
type VirtualStore struct {
p *VirtualSessionProvider
sid string
lock sync.RWMutex
data map[interface{}]interface{}
}
// NewVirtualStore creates and returns a virtual session store.
func NewVirtualStore(p *VirtualSessionProvider, sid string, kv map[interface{}]interface{}) *VirtualStore {
return &VirtualStore{
p: p,
sid: sid,
data: kv,
}
}
// Set sets value to given key in session.
func (s *VirtualStore) 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 *VirtualStore) Get(key interface{}) interface{} {
s.lock.RLock()
defer s.lock.RUnlock()
return s.data[key]
}
// Delete delete a key from session.
func (s *VirtualStore) Delete(key interface{}) error {
s.lock.Lock()
defer s.lock.Unlock()
delete(s.data, key)
return nil
}
// ID returns current session ID.
func (s *VirtualStore) ID() string {
return s.sid
}
// Release releases resource and save data to provider.
func (s *VirtualStore) Release() error {
s.lock.Lock()
defer s.lock.Unlock()
// Now need to lock the provider
s.p.lock.Lock()
defer s.p.lock.Unlock()
if oldUID, ok := s.data["_old_uid"]; (ok && (oldUID != "0" || len(s.data) > 1)) || (!ok && len(s.data) > 0) {
// Now ensure that we don't exist!
realProvider := s.p.provider
if realProvider.Exist(s.sid) {
// This is an error!
return fmt.Errorf("new sid '%s' already exists", s.sid)
}
realStore, err := realProvider.Read(s.sid)
if err != nil {
return err
}
for key, value := range s.data {
if err := realStore.Set(key, value); err != nil {
return err
}
}
return realStore.Release()
}
return nil
}
// Flush deletes all session data.
func (s *VirtualStore) Flush() error {
s.lock.Lock()
defer s.lock.Unlock()
s.data = make(map[interface{}]interface{})
return nil
}
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