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|
package handlers
import (
"encoding/json"
"log"
"net/http"
"sync"
"time"
"github.com/gorilla/websocket"
"task-dashboard/internal/models"
)
var upgrader = websocket.Upgrader{
ReadBufferSize: 1024,
WriteBufferSize: 1024,
CheckOrigin: func(r *http.Request) bool {
// Allow all connections (CORS disabled for WebSocket)
return true
},
}
// WSClient represents a connected browser
type WSClient struct {
conn *websocket.Conn
send chan []byte
}
// WSHub manages WebSocket connections
type WSHub struct {
clients map[*WSClient]bool
broadcast chan []byte
register chan *WSClient
unregister chan *WSClient
mu sync.RWMutex
}
var wsHub *WSHub
var hubOnce sync.Once
// GetWSHub returns the singleton WebSocket hub
func GetWSHub() *WSHub {
hubOnce.Do(func() {
wsHub = &WSHub{
clients: make(map[*WSClient]bool),
broadcast: make(chan []byte, 256),
register: make(chan *WSClient),
unregister: make(chan *WSClient),
}
go wsHub.run()
})
return wsHub
}
// run handles hub operations
func (h *WSHub) run() {
for {
select {
case client := <-h.register:
h.mu.Lock()
h.clients[client] = true
h.mu.Unlock()
log.Printf("WebSocket client connected, total: %d", len(h.clients))
case client := <-h.unregister:
h.mu.Lock()
if _, ok := h.clients[client]; ok {
delete(h.clients, client)
close(client.send)
}
h.mu.Unlock()
log.Printf("WebSocket client disconnected, total: %d", len(h.clients))
case message := <-h.broadcast:
h.mu.RLock()
for client := range h.clients {
select {
case client.send <- message:
default:
// Client buffer full, skip
}
}
h.mu.RUnlock()
}
}
}
// Broadcast sends a message to all connected clients
func (h *WSHub) Broadcast(msg []byte) {
h.broadcast <- msg
}
// ClientCount returns the number of connected clients
func (h *WSHub) ClientCount() int {
h.mu.RLock()
defer h.mu.RUnlock()
return len(h.clients)
}
// WSMessage is the structure for WebSocket messages
type WSMessage struct {
Type string `json:"type"`
Payload interface{} `json:"payload"`
}
// BroadcastAgentRequest sends an agent request notification to all browsers
func (h *Handler) BroadcastAgentRequest(session *models.AgentSession, trustLevel models.AgentTrustLevel) {
hub := GetWSHub()
payload := AgentRequestPayload{
RequestToken: session.RequestToken,
AgentName: session.AgentName,
AgentID: session.AgentID,
TrustLevel: trustLevel,
ExpiresAt: session.ExpiresAt,
}
msg := WSMessage{
Type: "agent_request",
Payload: payload,
}
data, err := json.Marshal(msg)
if err != nil {
log.Printf("Failed to marshal WebSocket message: %v", err)
return
}
hub.Broadcast(data)
log.Printf("Broadcasted agent request from %s to %d clients", session.AgentName, hub.ClientCount())
}
// HandleWebSocket handles the WebSocket connection at /ws/notifications
func (h *Handler) HandleWebSocket(w http.ResponseWriter, r *http.Request) {
// Check if the request is a WebSocket upgrade request
if !websocket.IsWebSocketUpgrade(r) {
http.Error(w, "Expected WebSocket Upgrade request", http.StatusBadRequest)
return
}
conn, err := upgrader.Upgrade(w, r, nil)
if err != nil {
log.Printf("WebSocket upgrade failed: %v", err)
return
}
hub := GetWSHub()
client := &WSClient{
conn: conn,
send: make(chan []byte, 256),
}
hub.register <- client
// Start goroutines for reading and writing
go client.writePump()
go client.readPump(hub)
}
// writePump sends messages to the client
func (c *WSClient) writePump() {
ticker := time.NewTicker(30 * time.Second)
defer func() {
ticker.Stop()
c.conn.Close()
}()
for {
select {
case message, ok := <-c.send:
c.conn.SetWriteDeadline(time.Now().Add(10 * time.Second))
if !ok {
// Channel closed
c.conn.WriteMessage(websocket.CloseMessage, []byte{})
return
}
if err := c.conn.WriteMessage(websocket.TextMessage, message); err != nil {
return
}
case <-ticker.C:
// Send ping
c.conn.SetWriteDeadline(time.Now().Add(10 * time.Second))
if err := c.conn.WriteMessage(websocket.PingMessage, nil); err != nil {
return
}
}
}
}
// readPump reads messages from the client
func (c *WSClient) readPump(hub *WSHub) {
defer func() {
hub.unregister <- c
c.conn.Close()
}()
c.conn.SetReadLimit(512)
c.conn.SetReadDeadline(time.Now().Add(60 * time.Second))
c.conn.SetPongHandler(func(string) error {
c.conn.SetReadDeadline(time.Now().Add(60 * time.Second))
return nil
})
for {
_, _, err := c.conn.ReadMessage()
if err != nil {
if websocket.IsUnexpectedCloseError(err, websocket.CloseGoingAway, websocket.CloseAbnormalClosure) {
log.Printf("WebSocket error: %v", err)
}
break
}
}
}
|
