/
sess.go
276 lines (233 loc) · 6.58 KB
/
sess.go
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package sess
import (
"io"
"os"
"fmt"
"sync"
"time"
"bytes"
"net/http"
"io/ioutil"
"crypto/md5"
"crypto/rand"
"sync/atomic"
mrand "math/rand"
"path/filepath"
"encoding/json"
gslog "fgdwcfgo/log"
)
const (
COOKIENAME string = "MYGOSESSIONID"
TIMELAYOUT string = "2006-01-02 15:04:05 -0700"
)
type sessInfo struct {
id string
m *sync.Mutex
expire time.Time
flag int32 // == 1 means need save
data map[string]interface{}
}
type Session struct {
si *sessInfo
w *http.ResponseWriter
ck *http.Cookie
}
var sessPool = struct {
m *sync.Mutex
path string
keep time.Duration
sess map[string]*sessInfo
} {&(sync.Mutex{}), "", time.Hour * 7 * 24, make(map[string]*sessInfo)}
func readOneSessFile(fn string) (si *sessInfo, err error) {
logging.Debug("load session", fn)
dat, err := ioutil.ReadFile(fn)
if err != nil { return }
lines := bytes.SplitN(dat, []byte("\n"), 3)
if len(lines) < 3 {
err = fmt.Errorf("Bad format")
return
}
si = &sessInfo{id:string(lines[0]), m:&sync.Mutex{}}
//si.expire
si.expire, err = time.Parse(TIMELAYOUT, string(lines[1]))
if err != nil { return }
if si.expire.Before(time.Now()) {
// this session is expired, remove file
logging.Debugf("expire line = %s, %v", string(lines[1]), time.Now())
err = os.Remove(fn)
return nil, err
}
err = json.Unmarshal(lines[2], &si.data)
//if err != nil { return }
return
}
func saveOneSessFile(sfn string, si *sessInfo) (err error) {
if (si.expire.Before(time.Now())) {
// this session expired, skip it
return
}
if atomic.LoadInt32(&si.flag) == 0 { return }
atomic.StoreInt32(&si.flag, 0)
logging.Debug("saveOneSessFile ", si.id)
j, err := json.Marshal(si.data)
if err != nil { return }
buf := new(bytes.Buffer)
buf.WriteString(si.id + "\n")
buf.WriteString(si.expire.Format(TIMELAYOUT) + "\n")
buf.Write(j)
fout, err := os.OpenFile(filepath.Join(sfn, si.id) + ".sess",
os.O_CREATE|os.O_WRONLY|os.O_TRUNC, 0600)
if err != nil { return }
defer fout.Close()
_, err = buf.WriteTo(fout)
return
}
// save file name to be used save session data
// start the monitor thread to save it periodly
// Should be called before server start
func Init(sfn string, keep time.Duration) (err error) {
var si *sessInfo
sessPool.m.Lock()
defer sessPool.m.Unlock()
if keep > 0 {
sessPool.keep = keep
}
// sfn == "", data keep in memory
if sfn == "" { return }
if sessPool.path == "" { // load from disk
logging.Debug("load session from disk")
sessPool.path = sfn
fs, e := filepath.Glob(filepath.Join(sfn, "*.sess"))
if e != nil { return e }
for _, f := range fs {
si, err = readOneSessFile(f)
if err != nil {
logging.Error(err)
} else if si != nil {
sessPool.sess[si.id] = si
}
}
} else { // save to disk
logging.Debug("save session to disk")
for _, si = range sessPool.sess {
err = saveOneSessFile(sfn, si)
if err != nil {
logging.Error(si.id, ": ", err)
}
}
}
_ = time.AfterFunc(time.Minute, func(){ _ = Init(sfn, 0) })
return nil
}
var logging = gslog.GetLogger("")
func genId(addr string) (ret string) {
h := md5.New()
b := make([]byte, 10)
_, _ = rand.Read(b)
io.WriteString(h, string(b))
io.WriteString(h, addr)
io.WriteString(h, time.Now().String())
for _, b := range h.Sum(nil) {
if '0' <= b && b <= '9' ||
'a' <= b && b <= 'z' ||
'A' <= b && b <= 'Z' {
ret += string(b)
} else {
ret += fmt.Sprintf("%x", b)
}
}
for ;len(ret) < 32; {
ret += string(ret[mrand.Intn(len(ret))])
}
return
}
func Start(w http.ResponseWriter, r *http.Request) (ses *Session) {
return StartAt(w, r, &http.Cookie{})
}
func StartAt(w http.ResponseWriter, r *http.Request, ck *http.Cookie) (ses *Session) {
c, e := r.Cookie(COOKIENAME)
logging.Debug("sess.Start: e =", e)
var si *sessInfo
if e == nil {
logging.Debugf("Start n = %s, v = %s", c.Name, c.Value)
sessPool.m.Lock()
si = sessPool.sess[c.Value]
sessPool.m.Unlock()
}
logging.Debug("Start si =", si)
if si == nil {
logging.Debug("Start new si")
id := genId(r.RemoteAddr)
si = &sessInfo{id:id, m:&(sync.Mutex{}),
data:make(map[string]interface{})}
}
ses = &Session{si, &w, ck}
ses.ck.Name = COOKIENAME
ses.ck.Value = si.id
return
}
/*
func (s *Session)mkCookie(e time.Time) (c *http.Cookie){
c = &http.Cookie{Name:COOKIENAME, Value:s.si.id, Expires:e}
// FIXME copy configure from s.ckp to c
return
}
*/
func (s *Session)SetCookieExpire(t time.Duration) {
si := s.si
var e = time.Time{}
if t > 0 {
e = time.Now().Add(t)
}
//c := http.Cookie{Name:COOKIENAME, Value:si.id, Expires:e} //, Domain:"/"}
//http.SetCookie(*(s.w), &c)
s.ck.Expires = e
http.SetCookie(*(s.w), s.ck)
si.m.Lock()
if e.After(si.expire) {
si.expire = e
}
si.m.Unlock()
}
func (s *Session)Set(name string, value interface{}) {
si := s.si
e := time.Now().Add(sessPool.keep)
//c := http.Cookie{Name:COOKIENAME, Value:si.id, Expires:e} //, Domain:"/"}
//http.SetCookie(*(s.w), &c)
s.ck.Expires = e
http.SetCookie(*(s.w), s.ck)
si.m.Lock()
if e.After(si.expire) {
si.expire = e
}
si.data[name] = value
si.m.Unlock()
atomic.StoreInt32(&si.flag, 1)
l := gslog.GetLogger("")
l.Debugf("n=%s, v=%#v, s.id=%s", name, value, si.id)
sessPool.m.Lock()
defer sessPool.m.Unlock()
sessPool.sess[si.id] = si
l.Debugf("sessPool = %#v", sessPool.sess)
l.Debugf("si = %#v", si.data)
}
func (s *Session)Get(name string) (value interface{}) {
s.si.m.Lock()
defer s.si.m.Unlock()
l := gslog.GetLogger("")
l.Debugf("Get s.id=%s", s.si.id)
l.Debug("Get si =", s.si.data)
s.si.expire = time.Now().Add(sessPool.keep)
atomic.StoreInt32(&s.si.flag, 1)
value = s.si.data[name]
return
}
func (s *Session)DumpJson() ([]byte, error) {
s.si.m.Lock()
defer s.si.m.Unlock()
j, err := json.Marshal(s.si.data)
if err != nil {
gslog.Debugf("json.Marshal(%v) return %v", s.si.data, err)
}
return j, err
}