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socket.go
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socket.go
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package main
import (
"encoding/json"
"github.com/gorilla/websocket"
"log"
"net/http"
"sync"
)
// DesktopMessage structure
type DesktopMessage struct {
Title string `json:"title"`
Message string `json:"message"`
}
// SocketMessage structure
type SocketMessage struct {
User *User `json:"user"`
Download *Transfer `json:"download"`
Message *DesktopMessage `json:"message"`
}
// IncomingSocketMessage structure
type IncomingSocketMessage struct {
Type string `json:"type"`
Content string `json:"content"`
}
type PendingMessagesMutex struct {
messages map[string][]SocketMessage
sync.RWMutex
}
type Funnel struct {
conn *websocket.Conn
sync.RWMutex
}
type Funnels struct {
conns map[string]*Funnel
sync.RWMutex
}
// WSConns stores all connected web sockets
var WSConns = Funnels{make(map[string]*Funnel), sync.RWMutex{}}
var PendingMessages = PendingMessagesMutex{make(map[string][]SocketMessage), sync.RWMutex{}}
// WSHandler is the http handler for web socket connections
func (s *Server) WSHandler(w http.ResponseWriter, r *http.Request) {
if r.Method != "GET" {
WriteError(w, r, 400, "Method not allowed")
return
}
var user = User{
UUID: r.Header.Get("UUID"),
UUIDKey: r.Header.Get("UUID-key"),
}
UUIDHash := Hash(user.UUID)
if !user.IsValid(s.db) {
WriteError(w, r, 401, "Invalid credentials!")
return
}
// validate inputs
if !IsValidVersion(r.Header.Get("Version")) {
WriteError(w, r, 400, "Invalid Version")
return
}
// connect to socket
wsconn, err := upgrader.Upgrade(w, r, nil)
Handle(err)
f := Funnel{}
f.conn = wsconn
// add web socket connection to list of clients
WSConns.AddConn(UUIDHash, &f)
// mark user as connected in db
go user.IsConnected(s.db, true)
// write pending messages
PendingMessages.RLock()
messages, ok := PendingMessages.messages[UUIDHash]
PendingMessages.RUnlock()
if ok {
// send pending messages to user
for _, message := range messages {
go f.Write(message)
}
}
// delete pending socket messages
PendingMessages.Lock()
delete(PendingMessages.messages, UUIDHash)
PendingMessages.Unlock()
// incoming socket messages
for {
_, message, err := wsconn.ReadMessage()
if err != nil {
break
}
var mess IncomingSocketMessage
Handle(json.Unmarshal(message, &mess))
if mess.Type == "keep-alive" {
go KeepAliveTransfer(s.db, user, mess.Content)
} else if mess.Type == "stats" {
user.SetStats(s.db)
WSConns.Write(SocketMessage{
User: &user,
}, user.UUID, true)
}
break
}
// mark user as disconnected
go user.IsConnected(s.db, false)
// remove client from clients
WSConns.RemConn(UUIDHash)
}
func (funnel *Funnel) Write(message interface{}) error {
jsonReply, err := json.Marshal(message)
if err != nil {
return err
}
funnel.Lock()
err = funnel.conn.WriteMessage(websocket.TextMessage, jsonReply)
funnel.Unlock()
return err
}
// Write sends a socket message to a connected UUID and stores if not connected
func (conns *Funnels) Write(message SocketMessage, UUID string, storeOnFail bool) bool {
hashUUID := Hash(UUID)
socket, ok := conns.GetConn(hashUUID)
if ok {
err := socket.Write(message)
if err == nil {
// successfully sent socket message
return true
}
Handle(err)
} else {
log.Println("UUID not connected to socket: " + hashUUID)
}
if storeOnFail {
PendingMessages.Lock()
PendingMessages.messages[hashUUID] = append(PendingMessages.messages[hashUUID], message)
PendingMessages.Unlock()
}
return false
}
func (conns *Funnels) GetConn(key string) (*Funnel, bool) {
conns.RLock()
socket, ok := conns.conns[key]
conns.RUnlock()
return socket, ok
}
func (conns *Funnels) AddConn(key string, funnel *Funnel) {
conns.Lock()
conns.conns[key] = funnel
conns.Unlock()
}
func (conns *Funnels) RemConn(key string) {
conns.Lock()
delete(conns.conns, key)
conns.Unlock()
}