117 lines
2.8 KiB
Go
117 lines
2.8 KiB
Go
package handlers
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import (
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"encoding/json"
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"log"
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"net/http"
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"sync"
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"nhooyr.io/websocket"
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"nhooyr.io/websocket/wsjson"
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"github.com/forgeo/forgebucket/internal/events"
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)
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// WSHandler manages WebSocket connections and bridges NATS events to clients.
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// All connected clients receive every platform event (subject + payload).
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// Per-user filtering is added in Phase 2B when CI events carry access control.
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type WSHandler struct {
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bus events.EventBus
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mu sync.RWMutex
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clients map[string]chan events.WSEnvelope // connID → send channel
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}
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func NewWSHandler(bus events.EventBus) *WSHandler {
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h := &WSHandler{
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bus: bus,
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clients: make(map[string]chan events.WSEnvelope),
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}
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h.subscribeAll()
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return h
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}
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// subscribeAll wires the NATS wildcard subscription that fans events to all clients.
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func (h *WSHandler) subscribeAll() {
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unsub, err := h.bus.Subscribe(">", func(subject string, data []byte) {
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env := events.WSEnvelope{Subject: subject, Payload: data}
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h.mu.RLock()
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defer h.mu.RUnlock()
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for id, ch := range h.clients {
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select {
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case ch <- env:
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default:
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// Client send buffer full — drop event rather than block.
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log.Printf("ws: dropped event %s for slow client %s", subject, id)
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}
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}
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})
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if err != nil {
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log.Printf("ws: nats subscribe failed: %v", err)
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return
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}
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// The subscription lives for the process lifetime; no cleanup needed.
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_ = unsub
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}
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func (h *WSHandler) register(id string) chan events.WSEnvelope {
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ch := make(chan events.WSEnvelope, 64)
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h.mu.Lock()
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h.clients[id] = ch
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h.mu.Unlock()
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return ch
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}
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func (h *WSHandler) unregister(id string) {
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h.mu.Lock()
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delete(h.clients, id)
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h.mu.Unlock()
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}
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// Hub upgrades the HTTP connection to WebSocket, registers the client, and
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// pumps NATS-sourced events to it until the connection closes.
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func (h *WSHandler) Hub(w http.ResponseWriter, r *http.Request) {
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conn, err := websocket.Accept(w, r, &websocket.AcceptOptions{
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OriginPatterns: []string{"localhost:*"},
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})
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if err != nil {
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return
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}
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defer conn.CloseNow()
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// Use remote address + a monotonic component as a simple unique ID.
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connID := r.RemoteAddr + "|" + r.Header.Get("Sec-Websocket-Key")
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send := h.register(connID)
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defer h.unregister(connID)
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ctx := r.Context()
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// Write pump: drain the send channel and write to the WebSocket.
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go func() {
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for {
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select {
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case env, ok := <-send:
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if !ok {
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return
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}
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msg := map[string]any{
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"subject": env.Subject,
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"payload": json.RawMessage(env.Payload),
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}
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if err := wsjson.Write(ctx, conn, msg); err != nil {
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return
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}
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case <-ctx.Done():
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return
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}
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}
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}()
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// Read pump: discard incoming messages (clients send no data for now),
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// keeping the connection alive and detecting closes.
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for {
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if _, _, err := conn.Read(ctx); err != nil {
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break
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}
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}
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}
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