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sessions.go
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sessions.go
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// Copyright (c) 2014 The SurgeMQ Authors. All rights reserved.
//
// 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 sessions
import (
"crypto/rand"
"encoding/base64"
"errors"
"io"
)
var (
ErrSessionsProviderNotFound = errors.New("Session: Session provider not found")
ErrKeyNotAvailable = errors.New("Session: not item found for key.")
providers = make(map[string]SessionsProvider)
)
type SessionsProvider interface {
New(id string) (*Session, error)
Get(id string) (*Session, error)
Del(id string)
Save(id string) error
Count() int
Close() error
}
// Register makes a session provider available by the provided name.
// If a Register is called twice with the same name or if the driver is nil,
// it panics.
func Register(name string, provider SessionsProvider) {
if provider == nil {
panic("session: Register provide is nil")
}
if _, dup := providers[name]; dup {
panic("session: Register called twice for provider " + name)
}
providers[name] = provider
}
func Unregister(name string) {
delete(providers, name)
}
type Manager struct {
store Store
}
func NewManager(store Store) *Manager {
return &Manager{store: store}
}
func (this *Manager) New(id string) (*Session, error) {
if id == "" {
id = this.sessionId()
}
sess := &Session{id: id}
err := this.store.Set(id, sess)
if err != nil {
return nil, err
}
return sess, nil
}
func (this *Manager) Get(id string) (*Session, error) {
return this.store.Get(id)
}
func (this *Manager) Del(id string) error {
return this.store.Del(id)
}
func (this *Manager) Save(id string, sess *Session) error {
return this.store.Set(id, sess)
}
func (this *Manager) Count() (int64, error) {
return this.store.Count()
}
func (this *Manager) Close() error {
return this.store.Close()
}
func (manager *Manager) sessionId() string {
b := make([]byte, 15)
if _, err := io.ReadFull(rand.Reader, b); err != nil {
return ""
}
return base64.URLEncoding.EncodeToString(b)
}