package session
import (
"bufio"
"fmt"
"io"
"net/http"
"sort"
"sync"
"sync/atomic"
"github.com/xjasonlyu/tun2socks/common/log"
"github.com/xjasonlyu/tun2socks/common/queue"
"github.com/xjasonlyu/tun2socks/common/stats"
)
const maxCompletedSessions = 100
var (
ServeAddr = "localhost:6001"
ServePath = "/stats/session/plain"
StatsVersion = ""
)
type simpleSessionStater struct {
server *http.Server
activeSessionMap sync.Map
completedSessionQueue *queue.Queue
}
func NewSimpleSessionStater() stats.SessionStater {
return &simpleSessionStater{
completedSessionQueue: queue.New(maxCompletedSessions),
}
}
func (s *simpleSessionStater) sessionStatsHandler(resp http.ResponseWriter, req *http.Request) {
// Slice of active sessions
var activeSessions []*stats.Session
s.activeSessionMap.Range(func(key, value interface{}) bool {
activeSessions = append(activeSessions, value.(*stats.Session))
return true
})
// Slice of completed sessions
var completedSessions []*stats.Session
for _, item := range s.completedSessionQueue.Copy() {
if sess, ok := item.(*stats.Session); ok {
completedSessions = append(completedSessions, sess)
}
}
tablePrint := func(w io.Writer, sessions []*stats.Session) {
// Sort by session start time.
sort.Slice(sessions, func(i, j int) bool {
return sessions[i].SessionStart.Sub(sessions[j].SessionStart) < 0
})
_, _ = fmt.Fprintf(w, "")
_, _ = fmt.Fprintf(w, "| Process | Network | Date | Duration | Client Addr | Target Addr | Upload | Download |
")
sort.Slice(sessions, func(i, j int) bool {
return sessions[i].SessionStart.After(sessions[j].SessionStart)
})
for _, sess := range sessions {
_, _ = fmt.Fprintf(w, "| %v | %v | %v | %v | %v | %v | %v | %v |
",
process(sess.Process),
sess.Network,
date(sess.SessionStart),
duration(sess.SessionStart, sess.SessionClose),
// sess.DialerAddr,
sess.ClientAddr,
sess.TargetAddr,
byteCountSI(atomic.LoadInt64(&sess.UploadBytes)),
byteCountSI(atomic.LoadInt64(&sess.DownloadBytes)),
)
}
_, _ = fmt.Fprintf(w, "
")
}
w := bufio.NewWriter(resp)
_, _ = fmt.Fprintf(w, "")
_, _ = fmt.Fprintf(w, `Go-tun2socks Sessions`)
_, _ = fmt.Fprintf(w, "Go-tun2socks %s
", StatsVersion)
_, _ = fmt.Fprintf(w, "Now: %s ; Uptime: %s
", now(), uptime())
_, _ = fmt.Fprintf(w, "Active sessions %d
", len(activeSessions))
tablePrint(w, activeSessions)
_, _ = fmt.Fprintf(w, "
")
_, _ = fmt.Fprintf(w, "Recently completed sessions %d
", len(completedSessions))
tablePrint(w, completedSessions)
_, _ = fmt.Fprintf(w, "")
_ = w.Flush()
}
func (s *simpleSessionStater) Start() error {
log.Debugf("Start session stater")
mux := http.NewServeMux()
mux.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
http.Redirect(w, r, ServePath, 301)
})
mux.HandleFunc(ServePath, s.sessionStatsHandler)
s.server = &http.Server{Addr: ServeAddr, Handler: mux}
go s.server.ListenAndServe()
return nil
}
func (s *simpleSessionStater) Stop() error {
log.Debugf("Stop session stater")
return s.server.Close()
}
func (s *simpleSessionStater) AddSession(key interface{}, session *stats.Session) {
s.activeSessionMap.Store(key, session)
}
func (s *simpleSessionStater) GetSession(key interface{}) *stats.Session {
if sess, ok := s.activeSessionMap.Load(key); ok {
return sess.(*stats.Session)
}
return nil
}
func (s *simpleSessionStater) RemoveSession(key interface{}) {
if sess, ok := s.activeSessionMap.Load(key); ok {
// move to completed sessions
s.completedSessionQueue.Put(sess)
if s.completedSessionQueue.Len() > maxCompletedSessions {
s.completedSessionQueue.Pop()
}
// delete
s.activeSessionMap.Delete(key)
}
}