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memcached.go
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memcached.go
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package session
import (
"bytes"
"encoding/gob"
"net/http"
"time"
"github.com/bradfitz/gomemcache/memcache"
"golang.org/x/xerrors"
"github.com/f110/lagrangian-proxy/pkg/config"
)
type MemcachedStore struct {
client *memcache.Client
}
var _ Store = &MemcachedStore{}
func NewMemcachedStore(conf *config.Session) *MemcachedStore {
return &MemcachedStore{client: memcache.New(conf.Servers...)}
}
func (m *MemcachedStore) GetSession(req *http.Request) (*Session, error) {
c, err := req.Cookie(CookieName)
if err != nil {
return nil, xerrors.Errorf(": %v", err)
}
return m.getFromMemcached(c.Value)
}
func (m *MemcachedStore) SetSession(w http.ResponseWriter, sess *Session) error {
err := m.save(sess)
if err != nil {
return xerrors.Errorf(": %v", err)
}
c := &http.Cookie{
Name: CookieName,
Value: sess.Unique,
Path: "/",
Domain: "local-proxy.f110.dev",
HttpOnly: true,
Expires: time.Now().Add(24 * time.Hour),
Secure: true,
}
http.SetCookie(w, c)
return nil
}
func (m *MemcachedStore) getFromMemcached(unique string) (*Session, error) {
item, err := m.client.Get(unique)
if err != nil {
return nil, xerrors.Errorf(": %v", err)
}
sess := &Session{}
if err := gob.NewDecoder(bytes.NewReader(item.Value)).Decode(sess); err != nil {
return nil, xerrors.Errorf(": %v", err)
}
return sess, nil
}
func (m *MemcachedStore) save(sess *Session) error {
value := new(bytes.Buffer)
if err := gob.NewEncoder(value).Encode(sess); err != nil {
return xerrors.Errorf(": %v", err)
}
err := m.client.Set(&memcache.Item{
Key: sess.Unique,
Value: value.Bytes(),
Expiration: int32((24 * time.Hour).Seconds()),
})
if err != nil {
return xerrors.Errorf(": %v", err)
}
return nil
}