/
session_manager.go
153 lines (122 loc) · 3.39 KB
/
session_manager.go
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/*
Copyright 2021 The KodeRover Authors.
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
package remotedialer
import (
"context"
"fmt"
"math/rand"
"net"
"sync"
"github.com/gorilla/websocket"
)
type sessionListener interface {
sessionAdded(clientKey string, sessionKey int64)
sessionRemoved(clientKey string, sessionKey int64)
}
type sessionManager struct {
sync.Mutex
clients map[string][]*Session
peers map[string][]*Session
listeners map[sessionListener]bool
}
func newSessionManager() *sessionManager {
return &sessionManager{
clients: map[string][]*Session{},
peers: map[string][]*Session{},
listeners: map[sessionListener]bool{},
}
}
func toDialer(s *Session, prefix string) Dialer {
return func(ctx context.Context, proto, address string) (net.Conn, error) {
if prefix == "" {
return s.serverConnectContext(ctx, proto, address)
}
return s.serverConnectContext(ctx, prefix+"::"+proto, address)
}
}
func (sm *sessionManager) removeListener(listener sessionListener) {
sm.Lock()
defer sm.Unlock()
delete(sm.listeners, listener)
}
func (sm *sessionManager) addListener(listener sessionListener) {
sm.Lock()
defer sm.Unlock()
sm.listeners[listener] = true
for k, sessions := range sm.clients {
for _, session := range sessions {
listener.sessionAdded(k, session.sessionKey)
}
}
for k, sessions := range sm.peers {
for _, session := range sessions {
listener.sessionAdded(k, session.sessionKey)
}
}
}
func (sm *sessionManager) getDialer(clientKey string) (Dialer, error) {
sm.Lock()
defer sm.Unlock()
sessions := sm.clients[clientKey]
if len(sessions) > 0 {
return toDialer(sessions[0], ""), nil
}
for _, sessions := range sm.peers {
for _, session := range sessions {
session.Lock()
keys := session.remoteClientKeys[clientKey]
session.Unlock()
if len(keys) > 0 {
return toDialer(session, clientKey), nil
}
}
}
return nil, fmt.Errorf("failed to find Session for client %s", clientKey)
}
func (sm *sessionManager) add(clientKey string, conn *websocket.Conn, peer bool) *Session {
sessionKey := rand.Int63()
session := newSession(sessionKey, clientKey, conn)
sm.Lock()
defer sm.Unlock()
if peer {
sm.peers[clientKey] = append(sm.peers[clientKey], session)
} else {
sm.clients[clientKey] = append(sm.clients[clientKey], session)
}
for l := range sm.listeners {
l.sessionAdded(clientKey, session.sessionKey)
}
return session
}
func (sm *sessionManager) remove(s *Session) {
sm.Lock()
defer sm.Unlock()
for _, store := range []map[string][]*Session{sm.clients, sm.peers} {
var newSessions []*Session
for _, v := range store[s.clientKey] {
if v.sessionKey == s.sessionKey {
continue
}
newSessions = append(newSessions, v)
}
if len(newSessions) == 0 {
delete(store, s.clientKey)
} else {
store[s.clientKey] = newSessions
}
}
for l := range sm.listeners {
l.sessionRemoved(s.clientKey, s.sessionKey)
}
s.Close()
}