main

// main project main.go
package main
 
import (
	"fmt"
	"html/template"
	"log"
	"net/http"
	"strings"
	"session"
	_"memory"
	"time"
)
 
func sayHelloName(w http.ResponseWriter,r *http.Request) {
	r.ParseForm()
	fmt.Println(r.Form)
	fmt.Println(r.URL.Path)
	fmt.Println(r.URL.Scheme)
	fmt.Println(r.Form["url_long"])
	for k,v := range r.Form {
		fmt.Println("key: ",k)
		fmt.Println("value:",strings.Join(v,""))
	}
	fmt.Fprintln(w,"hello nihao")
 
}
 
func login(w http.ResponseWriter,r *http.Request) {
	r.ParseForm()
	fmt.Println("method: ",r.Method)
	if r.Method == "GET" {
		t,err := template.ParseFiles("src/html/login.gtpl")
		if err != nil {
			fmt.Println(err)
			return
		}
		t.Execute(w,nil)
 
	} else {
		fmt.Println("username: ",r.Form["username"])
		fmt.Println("password: ",r.Form["password"])
	}
}
func login2(w http.ResponseWriter,r *http.Request) {
	sess := globalSessions.SessionStart(w,r)
	r.ParseForm()
	if r.Method == "GET" {
		t,_ := template.ParseFiles("src/html/login.gtpl")
		//w.Header().Set("Content-Type","text/html")
		t.Execute(w,sess.Get("username"))
	} else {
		sess.Set("username",r.Form["username"])
		http.Redirect(w,r,"/",302)
	}
}
 
func count(w http.ResponseWriter,r)
	createtime := sess.Get("createtime")
	if createtime == nil {
		sess.Set("createtime",time.Now().Unix())
	} else if (createtime.(int64) + 360) < (time.Now().Unix()) {
		globalSessions.SessionDestroy(w,r)
		sess = globalSessions.SessionStart(w,r)
	}
	ct := sess.Get("countnum")
	if ct == nil {
		sess.Set("countnum",1)
	} else {
		sess.Set("countnum",(ct.(int) + 1))
	}
	t,_ := template.ParseFiles("count.gtpl")
	w.Header().Set("Content-Type","text/html")
	t.Execute(w,sess.Get("countnum"))
}
func main() {
	//http.HandleFunc("/",sayHelloName);
	http.HandleFunc("/login",login)
	http.HandleFunc("/login2",login2)
	err := http.ListenAndServe(":9090",nil)
	if err != nil {
		log.Fatalf("Listen and server",err)
	}
}
var globalSessions *session.Manager
 
func init() {
	globalSessions,_ = session.NewSessionManager("memory","goSessionid",3600)
	go globalSessions.GC()
	fmt.Println("fd")
}

package session
 
import (
	"crypto/rand"
	"encoding/base64"
	"fmt"
	"io"
	"net/http"
	"net/url"
	"sync"
	"time"
)
 
type Manager struct {
	cookieName  string
	lock        sync.Mutex
	provider    Provider
	maxLifeTime int64
}
 
type Provider interface {
	SessionInit(sid string) (Session,error)
	SessionRead(sid string) (Session,error)
	SessionDestroy(sid string) error
	SessionGC(maxLifeTime int64)
}
 
type Session interface {
	Set(key,value interface{}) error
	Get(key interface{}) interface{}
	Delete(ket interface{}) error
	SessionID() string
}
 
func NewSessionManager(provideName,cookieName string,maxLifeTime int64) (*Manager,error) {
	provide,ok := provides[provideName]
	if !ok {
		return nil,fmt.Errorf("session: unknown provide %q (forgotten import?",provideName)
	}
	return &Manager{cookieName: cookieName,provider: provide,maxLifeTime: maxLifeTime},nil
}
 
func Register(name string,provide Provider) {
	if provide == nil {
		panic("session: Register provide is nil")
	}
	if _,dup := provides[name]; dup {
		panic("session: Register called twice for provide " + name)
	}
	provides[name] = provide
}
 
var provides = make(map[string]Provider)
 
func (manager *Manager) sessionId() string {
	b := make([]byte,32)
	if _,err := io.ReadFull(rand.Reader,b); err != nil {
		return ""
	}
	return base64.URLEncoding.EncodeToString(b)
}
 
func (manager *Manager) SessionStart(w http.ResponseWriter,r *http.Request) (session Session) {
	manager.lock.Lock()
	defer manager.lock.Unlock()
	cookie,err := r.Cookie(manager.cookieName)
	if err != nil || cookie.Value == "" {
		sid := manager.sessionId()
		session,_ = manager.provider.SessionInit(sid)
		cookie := http.Cookie{Name: manager.cookieName,Value: url.QueryEscape(sid),Path: "/",HttpOnly: true,MaxAge: int(manager.maxLifeTime)}
		http.SetCookie(w,&cookie)
	} else {
		sid,_ := url.QueryUnescape(cookie.Value)
		session,_ = manager.provider.SessionRead(sid)
	}
	return session
}
func (manager *Manager) SessionDestroy(w http.ResponseWriter,r *http.Request){
	cookie,err := r.Cookie(manager.cookieName)
	if err != nil || cookie.Value == "" {
		return
	} else {
		manager.lock.Lock()
		defer manager.lock.Unlock()
		manager.provider.SessionDestroy(cookie.Value)
		expiration := time.Now()
		cookie := http.Cookie{Name: manager.cookieName,Expires: expiration,MaxAge: -1}
		http.SetCookie(w,&cookie)
	}
}
 
func (manager *Manager) GC() {
	manager.lock.Lock()
	defer manager.lock.Unlock()
	manager.provider.SessionGC(manager.maxLifeTime)
	time.AfterFunc(time.Duration(manager.maxLifeTime),func(){ manager.GC() })
}

package memory
 
import (
	"container/list"
	"time"
	"sync"
	"fmt"
	"session"
)
 
type SessionStore struct {
	sid string //session id 唯一标示
	timeAccessed time.Time //最后访问时间
	value map[interface{}]interface{} //session 里面存储的值
}
 
func (st *SessionStore) Set(key,value interface{}) error {
	st.value[key] = value
	pder.SessionUpdate(st.sid)
	return nil
}
func (st *SessionStore) Get(key interface{}) interface{} {
	pder.SessionUpdate(st.sid)
	if v,ok := st.value[key]; ok {
		return v
	} else {
		return nil
	}
	return nil
}
func (st *SessionStore) Delete(key interface{}) error {
	delete(st.value,key)
	pder.SessionUpdate(st.sid)
	return nil
}
func (st *SessionStore) SessionID() string {
	return st.sid
}
 
 
type Provider struct {
	lock sync.Mutex //用来锁
	sessions map[string]*list.Element //用来存储在内存
	list *list.List //用来做 gc
}
 
func (provider *Provider) SessionInit(sid string) (session.Session,error) {
	provider.lock.Lock()
	defer provider.lock.Unlock()
	v := make(map[interface{}]interface{},0)
	newsess := &SessionStore{sid: sid,timeAccessed: time.Now(),value: v}
	element := provider.list.PushBack(newsess)
	provider.sessions[sid] = element
	return newsess,nil
}
 
func (provider *Provider) SessionRead(sid string) (session.Session,error) {
	if element,ok := provider.sessions[sid]; ok {
		return element.Value.(*SessionStore),nil
	} else {
		sess,err := provider.SessionInit(sid)
		return sess,err
	}
	return nil,nil
}
 
func (provider *Provider) SessionDestroy(sid string) error {
	if element,ok := provider.sessions[sid]; ok {
		delete(provider.sessions,sid)
		provider.list.Remove(element)
		return nil
	}
	return nil
}
 
func (provider *Provider) SessionGC(maxLifeTime int64) {
	provider.lock.Lock()
	defer provider.lock.Unlock()
	for {
		element := provider.list.Back()
		if element == nil {
			break
		}
		if (element.Value.(*SessionStore).timeAccessed.Unix() + maxLifeTime) <
		time.Now().Unix() {
			provider.list.Remove(element)
			delete(provider.sessions,element.Value.(*SessionStore).sid)
		} else {
			break
		}
	}
}
func (provider *Provider) SessionUpdate(sid string) error {
	provider.lock.Lock()
	defer provider.lock.Unlock()
	if element,ok := provider.sessions[sid]; ok {
		element.Value.(*SessionStore).timeAccessed = time.Now()
		provider.list.MoveToFront(element)
		return nil
	}
	return nil
}
 
var pder = &Provider{list: list.New()}
 
func init() {
	pder.sessions = make(map[string]*list.Element,0)
	session.Register("memory",pder)
	fmt.Println("wzz")
}