99 lines
3.5 KiB
Go
99 lines
3.5 KiB
Go
// Command mwse is the MWSE engine: a WebSocket relay that virtualizes connected
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// peers so they can exchange data through rooms, pairings and data tunnels without
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// knowing one another's real identity. It is the Go rewrite of the original
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// Node.js engine; the on-the-wire SDK contract is unchanged.
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package main
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import (
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"context"
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"errors"
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"log"
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"net/http"
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"os"
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"os/signal"
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"syscall"
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"time"
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"git.saqut.com/saqut/mwse/internal/bridge"
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"git.saqut.com/saqut/mwse/internal/config"
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"git.saqut.com/saqut/mwse/internal/httpserver"
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"git.saqut.com/saqut/mwse/internal/services"
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"git.saqut.com/saqut/mwse/internal/ws"
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)
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func main() {
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cfg := config.Load()
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hub := ws.NewHub()
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// Bridge (3rd-party server integration, #46) — optional; activated by env vars.
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// BRIDGE_APPROVE_URL: before each WebSocket upgrade, MWSE POSTs the candidate
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// client id + metadata there; a non-200 or {"approve":false} body rejects it.
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// BRIDGE_TRIGGER_URL: when a suit notification is replied to, MWSE POSTs the
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// reply there so the app is notified immediately instead of polling.
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var srvOpts httpserver.ServerOptions
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var svcOpts []services.Option
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if approveURL := os.Getenv("BRIDGE_APPROVE_URL"); approveURL != "" {
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srvOpts.Approver = bridge.NewHTTPApprover(approveURL, 0)
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log.Printf("bridge: connection approval delegated to %s", approveURL)
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}
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if triggerURL := os.Getenv("BRIDGE_TRIGGER_URL"); triggerURL != "" {
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svcOpts = append(svcOpts, services.WithNotifyTrigger(bridge.NewHTTPTrigger(triggerURL, 0)))
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log.Printf("bridge: suit-reply trigger wired to %s", triggerURL)
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}
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// The inbox is always created so bridge/send and POST /api/bridge/inbox are
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// available once either bridge env var is set, or if the inbox is otherwise
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// useful. When neither env var is set, the services option is simply not added
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// and the bridge/send handler is not registered.
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if srvOpts.Approver != nil || os.Getenv("BRIDGE_INBOX") != "" {
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inbox := bridge.NewInbox(0)
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svcOpts = append(svcOpts, services.WithBridgeInbox(inbox))
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srvOpts.BridgeInbox = inbox
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log.Printf("bridge: inbox enabled (POST /api/bridge/inbox)")
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}
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reg := services.Register(hub, svcOpts...)
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// The notify and datastore stores hold entries with a TTL; their janitors
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// reclaim expired ones so memory cannot grow without bound. They are stopped
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// during shutdown so no goroutine is leaked.
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stopNotify := reg.Notify.StartJanitor(time.Minute)
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stopData := reg.Data.StartJanitor(time.Minute)
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defer stopNotify()
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defer stopData()
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srv := httpserver.New(hub, cfg, srvOpts)
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// Run the listener in the background so main can wait for a shutdown signal.
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serverErr := make(chan error, 1)
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go func() {
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log.Printf("MWSE engine listening on %s", cfg.Addr())
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if err := srv.ListenAndServe(); err != nil && !errors.Is(err, http.ErrServerClosed) {
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serverErr <- err
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}
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}()
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// Wait for SIGINT/SIGTERM or a fatal listener error.
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stop := make(chan os.Signal, 1)
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signal.Notify(stop, syscall.SIGINT, syscall.SIGTERM)
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select {
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case err := <-serverErr:
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log.Fatalf("MWSE engine failed: %v", err)
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case sig := <-stop:
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log.Printf("received %s, shutting down gracefully", sig)
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}
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// Graceful shutdown: stop accepting new HTTP work, then close every live
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// WebSocket connection so peers receive a clean close frame.
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ctx, cancel := context.WithTimeout(context.Background(), cfg.ShutdownTimeout)
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defer cancel()
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if err := srv.Shutdown(ctx); err != nil {
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log.Printf("http shutdown error: %v", err)
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}
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hub.CloseAll()
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log.Printf("MWSE engine stopped")
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}
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