Revert "Add session keep alive. If client doesn't send a keep alive, after a"

This reverts commit 1b0d363ffe.

config/config.go

@@ -3,7 +3,6 @@ package config
 import (
 	"flag"
 	"fmt"
-	"log"
 	"os"
 	"regexp"
 	"time"
@@ -40,8 +39,6 @@ var SecureCookie *securecookie.SecureCookie
 var GithubClientID, GithubClientSecret string
 var FacebookClientID, FacebookClientSecret string
 var DockerClientID, DockerClientSecret string
-var SessionKeepAlive time.Duration
-var sessionKeepAlive string
 
 type stringslice []string
 
@@ -75,7 +72,6 @@ func ParseFlags() {
 	flag.StringVar(&SSHKeyPath, "ssh_key_path", "", "SSH Private Key to use")
 	flag.StringVar(&CookieHashKey, "cookie-hash-key", "", "Hash key to use to validate cookies")
 	flag.StringVar(&CookieBlockKey, "cookie-block-key", "", "Block key to use to encrypt cookies")
-	flag.StringVar(&sessionKeepAlive, "session-keep-alive", "5m", "Duration for which a session will be kept alive when no more heartbeats arrive")
 
 	flag.StringVar(&GithubClientID, "oauth-github-client-id", "", "Github OAuth Client ID")
 	flag.StringVar(&GithubClientSecret, "oauth-github-client-secret", "", "Github OAuth Client Secret")
@@ -90,12 +86,6 @@ func ParseFlags() {
 
 	SecureCookie = securecookie.New([]byte(CookieHashKey), []byte(CookieBlockKey))
 
-	dur, err := time.ParseDuration(sessionKeepAlive)
-	if err != nil {
-		log.Fatalf("Cannot parse duration of flag [-session-keep-alive]. Got: %v\n", err)
-	}
-	SessionKeepAlive = dur
-
 	registerOAuthProviders()
 }
 

event/event.go

@@ -15,7 +15,6 @@ var (
 	SESSION_END              = EventType("session end")
 	SESSION_READY            = EventType("session ready")
 	SESSION_BUILDER_OUT      = EventType("session builder out")
-	SESSION_KEEP_ALIVE       = EventType("session keep alive")
 )
 
 type Handler func(sessionId string, args ...interface{})

handlers/ws.go

@@ -6,7 +6,6 @@ import (
 
 	"github.com/googollee/go-socket.io"
 	"github.com/gorilla/mux"
-	"github.com/play-with-docker/play-with-docker/event"
 )
 
 func WS(so socketio.Socket) {
@@ -66,10 +65,6 @@ func WS(so socketio.Socket) {
 		m.Close()
 		core.ClientClose(client)
 	})
-
-	so.On("session keep alive", func() {
-		e.Emit(event.SESSION_KEEP_ALIVE, sessionId)
-	})
 }
 
 func WSError(so socketio.Socket) {

scheduler/scheduler.go

@@ -6,7 +6,6 @@ import (
 	"log"
 	"time"
 
-	"github.com/play-with-docker/play-with-docker/config"
 	"github.com/play-with-docker/play-with-docker/event"
 	"github.com/play-with-docker/play-with-docker/pwd"
 	"github.com/play-with-docker/play-with-docker/pwd/types"
@@ -24,9 +23,8 @@ type SchedulerApi interface {
 }
 
 type scheduledSession struct {
-	session   *types.Session
+	session *types.Session
-	keepAlive *time.Timer
+	cancel  context.CancelFunc
-	cancel    context.CancelFunc
 }
 
 type scheduledInstance struct {
@@ -70,10 +68,6 @@ func (s *scheduler) processSession(ctx context.Context, ss *scheduledSession) {
 		// Session has expired. Need to close the session.
 		s.pwd.SessionClose(ss.session)
 		return
-	case <-ss.keepAlive.C:
-		// No keep alive has been received after the defined interval
-		log.Printf("No keep alive has been received for session %s after %s. Closing.\n", ss.session.Id, config.SessionKeepAlive)
-		s.pwd.SessionClose(ss.session)
 	case <-ctx.Done():
 		return
 	}
@@ -147,7 +141,6 @@ func (s *scheduler) scheduleSession(session *types.Session) {
 	s.scheduledSessions[session.Id] = ss
 	ctx, cancel := context.WithCancel(context.Background())
 	ss.cancel = cancel
-	ss.keepAlive = time.NewTimer(config.SessionKeepAlive)
 	go s.processSession(ctx, ss)
 	log.Printf("Scheduled session %s\n", session.Id)
 }
@@ -232,18 +225,6 @@ func (s *scheduler) Start() error {
 		instance := &types.Instance{Name: instanceName}
 		s.unscheduleInstance(instance)
 	})
-	s.event.On(event.SESSION_KEEP_ALIVE, func(sessionId string, args ...interface{}) {
-		log.Printf("Keep alive recevied for session %s\n", sessionId)
-		if _, found := s.scheduledSessions[sessionId]; !found {
-			log.Printf("Session %s was not found. Ignoring.\n", sessionId)
-			return
-		}
-		ss := s.scheduledSessions[sessionId]
-		if ss.keepAlive.Stop() {
-			log.Printf("Keep alive reset for session %s\n", sessionId)
-			ss.keepAlive.Reset(config.SessionKeepAlive)
-		}
-	})
 	s.started = true
 
 	return nil

www/assets/app.js

@@ -181,8 +181,6 @@
 
         var socket = io({ path: '/sessions/' + sessionId + '/ws' });
 
-	
-
         socket.on('instance terminal status', function(name, status) {
             var instance = $scope.idx[name];
             instance.status = status;
@@ -249,11 +247,8 @@
         socket.on('connect_error', function() {
           $scope.connected = false;
         });
-        socket.on('connect', function(s) {
+        socket.on('connect', function() {
           $scope.connected = true;
-  	  setInterval(function() {
-        	socket.emit('session keep alive', 'keep me alive please! ' + new Date());
-	  }, 30*1000);
         });
 
         socket.on('instance stats', function(stats) {