/
ledis_session.go
executable file
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/
ledis_session.go
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// Package ledis provide session Provider
package ledis
import (
"net/http"
"strconv"
"strings"
"sync"
"github.com/goasana/asana/session"
"github.com/ledisdb/ledisdb/config"
"github.com/ledisdb/ledisdb/ledis"
)
var (
ledispder = &Provider{}
c *ledis.DB
)
// SessionStore ledis session store
type SessionStore struct {
sid string
lock sync.RWMutex
values map[interface{}]interface{}
maxlifetime int64
}
// Set value in ledis session
func (ls *SessionStore) Set(key, value interface{}) error {
ls.lock.Lock()
defer ls.lock.Unlock()
ls.values[key] = value
return nil
}
// Get value in ledis session
func (ls *SessionStore) Get(key interface{}) interface{} {
ls.lock.RLock()
defer ls.lock.RUnlock()
if v, ok := ls.values[key]; ok {
return v
}
return nil
}
// Delete value in ledis session
func (ls *SessionStore) Delete(key interface{}) error {
ls.lock.Lock()
defer ls.lock.Unlock()
delete(ls.values, key)
return nil
}
// Flush clear all values in ledis session
func (ls *SessionStore) Flush() error {
ls.lock.Lock()
defer ls.lock.Unlock()
ls.values = make(map[interface{}]interface{})
return nil
}
// SessionID get ledis session id
func (ls *SessionStore) SessionID() string {
return ls.sid
}
// SessionRelease save session values to ledis
func (ls *SessionStore) SessionRelease(w http.ResponseWriter) {
b, err := session.EncodeGob(ls.values)
if err != nil {
return
}
_ = c.Set([]byte(ls.sid), b)
_, _ = c.Expire([]byte(ls.sid), ls.maxlifetime)
}
// Provider ledis session provider
type Provider struct {
maxlifetime int64
savePath string
db int
}
// SessionInit init ledis session
// savepath like ledis server saveDataPath,pool size
// e.g. 127.0.0.1:6379,100,asana
func (lp *Provider) SessionInit(maxlifetime int64, savePath string) error {
var err error
lp.maxlifetime = maxlifetime
configs := strings.Split(savePath, ",")
if len(configs) == 1 {
lp.savePath = configs[0]
} else if len(configs) == 2 {
lp.savePath = configs[0]
lp.db, err = strconv.Atoi(configs[1])
if err != nil {
return err
}
}
cfg := new(config.Config)
cfg.DataDir = lp.savePath
var ledisInstance *ledis.Ledis
ledisInstance, err = ledis.Open(cfg)
if err != nil {
return err
}
c, err = ledisInstance.Select(lp.db)
return err
}
// SessionRead read ledis session by sid
func (lp *Provider) SessionRead(sid string) (session.Store, error) {
var (
kv map[interface{}]interface{}
err error
)
kvs, _ := c.Get([]byte(sid))
if len(kvs) == 0 {
kv = make(map[interface{}]interface{})
} else {
if kv, err = session.DecodeGob(kvs); err != nil {
return nil, err
}
}
ls := &SessionStore{sid: sid, values: kv, maxlifetime: lp.maxlifetime}
return ls, nil
}
// SessionExist check ledis session exist by sid
func (lp *Provider) SessionExist(sid string) bool {
count, _ := c.Exists([]byte(sid))
return count != 0
}
// SessionRegenerate generate new sid for ledis session
func (lp *Provider) SessionRegenerate(oldsid, sid string) (session.Store, error) {
count, _ := c.Exists([]byte(sid))
if count == 0 {
// oldsid doesn't exists, set the new sid directly
// ignore error here, since if it return error
// the existed value will be 0
_ = c.Set([]byte(sid), []byte(""))
_, _ = c.Expire([]byte(sid), lp.maxlifetime)
} else {
data, _ := c.Get([]byte(oldsid))
_ = c.Set([]byte(sid), data)
_, _ = c.Expire([]byte(sid), lp.maxlifetime)
}
return lp.SessionRead(sid)
}
// SessionDestroy delete ledis session by id
func (lp *Provider) SessionDestroy(sid string) error {
_, _ = c.Del([]byte(sid))
return nil
}
// SessionGC Impelment method, no used.
func (lp *Provider) SessionGC() {
}
// SessionAll return all active session
func (lp *Provider) SessionAll() int {
return 0
}
func init() {
session.Register("ledis", ledispder)
}