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