wide/session/sessions.go

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// 会话操作.
// Wide 服务器端需要维护两种会话:
// 1. HTTP 会话:主要用于验证登录
// 2. Wide 会话:浏览器 tab 打开/刷新会创建一个,并和 HTTP 会话进行关联
//
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// 当会话失效时:释放所有和该会话相关的资源,例如运行中的程序进程、事件队列等.
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package session
import (
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"encoding/json"
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"math/rand"
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"net/http"
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"os"
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"strconv"
"sync"
"time"
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"github.com/b3log/wide/conf"
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"github.com/b3log/wide/event"
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"github.com/b3log/wide/util"
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"github.com/golang/glog"
"github.com/gorilla/sessions"
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"github.com/gorilla/websocket"
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)
const (
SessionStateActive = iota // 会话状态:活的
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SessionStateClosed // 会话状态:已关闭(这个状态目前暂时没有使用到)
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)
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var (
// 会话通道. <sid, *util.WSChannel>var
sessionWS = map[string]*util.WSChannel{}
// 输出通道. <sid, *util.WSChannel>
OutputWS = map[string]*util.WSChannel{}
// 通知通道. <sid, *util.WSChannel>
NotificationWS = map[string]*util.WSChannel{}
)
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// 用户 HTTP 会话,用于验证登录.
var HTTPSession = sessions.NewCookieStore([]byte("BEYOND"))
// Wide 会话,对应一个浏览器 tab.
type WideSession struct {
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Id string // 唯一标识
Username string // 用户名
HTTPSession *sessions.Session // 关联的 HTTP 会话
Processes []*os.Process // 关联的进程集
EventQueue *event.UserEventQueue // 关联的事件队列
State int // 状态
Content *conf.LatestSessionContent // 最近一次会话内容
Created time.Time // 创建时间
Updated time.Time // 最近一次使用时间
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}
type Sessions []*WideSession
// 所有 Wide 会话集.
var WideSessions Sessions
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// 排它锁,防止并发修改.
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var mutex sync.Mutex
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// 在一些特殊情况(例如浏览器不间断刷新/在源代码视图刷新)下 Wide 会话集内会出现无效会话该函数定时1 小时)检查并移除这些无效会话.
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// 无效会话:在检查时间内 30 分钟都没有使用过的会话WideSession.Updated 字段.
func FixedTimeRelease() {
go func() {
for {
hour, _ := time.ParseDuration("-30m")
threshold := time.Now().Add(hour)
for _, s := range WideSessions {
if s.Updated.Before(threshold) {
glog.V(3).Infof("Removes a invalid session [%s]", s.Id)
WideSessions.Remove(s.Id)
}
}
time.Sleep(time.Hour)
}
}()
}
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// 建立会话通道.
// 通道断开时销毁会话状态,回收相关资源.
func WSHandler(w http.ResponseWriter, r *http.Request) {
sid := r.URL.Query()["sid"][0]
wSession := WideSessions.Get(sid)
if nil == wSession {
glog.Errorf("Session [%s] not found", sid)
return
}
conn, _ := websocket.Upgrade(w, r, nil, 1024, 1024)
wsChan := util.WSChannel{Sid: sid, Conn: conn, Request: r, Time: time.Now()}
sessionWS[sid] = &wsChan
ret := map[string]interface{}{"output": "Ouput initialized", "cmd": "init-session"}
wsChan.Conn.WriteJSON(&ret)
glog.V(4).Infof("Open a new [Session Channel] with session [%s], %d", sid, len(sessionWS))
input := map[string]interface{}{}
for {
if err := wsChan.Conn.ReadJSON(&input); err != nil {
glog.V(3).Infof("[Session Channel] of session [%s] disconnected, releases all resources with it", sid)
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WideSessions.Remove(sid)
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return
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}
ret = map[string]interface{}{"output": "", "cmd": "session-output"}
if err := wsChan.Conn.WriteJSON(&ret); err != nil {
glog.Error("Session WS ERROR: " + err.Error())
return
}
wsChan.Time = time.Now()
}
}
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// 会话内容保存.
func SaveContent(w http.ResponseWriter, r *http.Request) {
data := map[string]interface{}{"succ": true}
defer util.RetJSON(w, r, data)
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args := struct {
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Sid string
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*conf.LatestSessionContent
}{}
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if err := json.NewDecoder(r.Body).Decode(&args); err != nil {
glog.Error(err)
data["succ"] = false
return
}
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wSession := WideSessions.Get(args.Sid)
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if nil == wSession {
data["succ"] = false
return
}
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wSession.Content = args.LatestSessionContent
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for _, user := range conf.Wide.Users {
if user.Name == wSession.Username {
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// 更新配置内存变量conf.FixedTimeSave() 会负责定时持久化
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user.LatestSessionContent = wSession.Content
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wSession.Refresh()
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return
}
}
}
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// 设置会话关联的进程集.
func (s *WideSession) SetProcesses(ps []*os.Process) {
s.Processes = ps
s.Refresh()
}
// 刷新会话最近一次使用时间.
func (s *WideSession) Refresh() {
s.Updated = time.Now()
}
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// 创建一个 Wide 会话.
func (sessions *Sessions) New(httpSession *sessions.Session) *WideSession {
mutex.Lock()
defer mutex.Unlock()
rand.Seed(time.Now().UnixNano())
id := strconv.Itoa(rand.Int())
now := time.Now()
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// 创建用户事件队列
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userEventQueue := event.UserEventQueues.New(id)
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ret := &WideSession{
Id: id,
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Username: httpSession.Values["username"].(string),
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HTTPSession: httpSession,
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EventQueue: userEventQueue,
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State: SessionStateActive,
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Content: &conf.LatestSessionContent{},
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Created: now,
Updated: now,
}
*sessions = append(*sessions, ret)
return ret
}
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// 获取 Wide 会话.
func (sessions *Sessions) Get(sid string) *WideSession {
mutex.Lock()
defer mutex.Unlock()
for _, s := range *sessions {
if s.Id == sid {
return s
}
}
return nil
}
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// 移除 Wide 会话,释放相关资源.
// 会话相关资源:
// 1. 用户事件队列
// 2. 运行中的进程
// 3. WebSocket 通道
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func (sessions *Sessions) Remove(sid string) {
mutex.Lock()
defer mutex.Unlock()
for i, s := range *sessions {
if s.Id == sid {
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// 从会话集中移除
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*sessions = append((*sessions)[:i], (*sessions)[i+1:]...)
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// 关闭用户事件队列
event.UserEventQueues.Close(sid)
// 杀进程
for _, p := range s.Processes {
if err := p.Kill(); nil != err {
glog.Errorf("Can't kill process [%d] of session [%s]", p.Pid, sid)
} else {
glog.V(3).Infof("Killed a process [%d] of session [%s]", p.Pid, sid)
}
}
// 回收所有通道
if ws, ok := OutputWS[sid]; ok {
ws.Close()
delete(OutputWS, sid)
}
if ws, ok := NotificationWS[sid]; ok {
ws.Close()
delete(NotificationWS, sid)
}
if ws, ok := sessionWS[sid]; ok {
ws.Close()
delete(sessionWS, sid)
}
glog.V(3).Infof("Removed a session [%s]", s.Id)
cnt := 0 // 统计当前 HTTP 会话关联的 Wide 会话数量
for _, s := range *sessions {
if s.HTTPSession.ID == s.HTTPSession.ID {
cnt++
}
}
glog.V(3).Infof("User [%s] has [%d] sessions", s.Username, cnt)
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return
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}
}
}
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// 获取 username 指定的用户的所有 Wide 会话.
func (sessions *Sessions) GetByUsername(username string) []*WideSession {
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mutex.Lock()
defer mutex.Unlock()
ret := []*WideSession{}
for _, s := range *sessions {
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if s.Username == username {
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ret = append(ret, s)
}
}
return ret
}