diff --git a/client/main.go b/client/main.go index fd5ba24..d313c78 100644 --- a/client/main.go +++ b/client/main.go @@ -12,12 +12,20 @@ import ( "log" "net/http" "os" + "runtime" "strings" "time" "github.com/atotto/clipboard" ) +// defaultLabel returns "{platform}-{transport}-{role}" so the server can +// tell at a glance who's connecting. Transport is "sse" today; "rtc" once +// WebRTC lands (v0.3 roadmap). +func defaultLabel(role string) string { + return fmt.Sprintf("%s-sse-%s", runtime.GOOS, role) +} + var ( noClipboard bool myLabel string @@ -31,10 +39,18 @@ type Message struct { func main() { server := flag.String("server", "https://tether.pecord.io", "tether-server base URL") - label := flag.String("label", "linux-client", "X-Tether-Client label") + label := flag.String("label", "", "X-Tether-Client label (default: -sse-)") sendText := flag.String("send", "", "send this text and exit (otherwise listen)") flag.BoolVar(&noClipboard, "no-clipboard", false, "don't write incoming messages to the OS clipboard") flag.Parse() + + if *label == "" { + if *sendText != "" { + *label = defaultLabel("sender") + } else { + *label = defaultLabel("listener") + } + } myLabel = *label if *sendText != "" { diff --git a/go.mod b/go.mod index 7b4be4e..fd6a481 100644 --- a/go.mod +++ b/go.mod @@ -2,4 +2,43 @@ module github.com/pecord/tether go 1.22 -require github.com/atotto/clipboard v0.1.4 +require ( + github.com/atotto/clipboard v0.1.4 + github.com/prometheus/client_golang v1.20.5 +) + +require ( + github.com/beorn7/perks v1.0.1 // indirect + github.com/cespare/xxhash/v2 v2.3.0 // indirect + github.com/davecgh/go-spew v1.1.1 // indirect + github.com/google/uuid v1.3.1 // indirect + github.com/klauspost/compress v1.17.9 // indirect + github.com/munnerz/goautoneg v0.0.0-20191010083416-a7dc8b61c822 // indirect + github.com/pion/datachannel v1.5.8 // indirect + github.com/pion/dtls/v2 v2.2.12 // indirect + github.com/pion/ice/v2 v2.3.38 // indirect + github.com/pion/interceptor v0.1.29 // indirect + github.com/pion/logging v0.2.2 // indirect + github.com/pion/mdns v0.0.12 // indirect + github.com/pion/randutil v0.1.0 // indirect + github.com/pion/rtcp v1.2.14 // indirect + github.com/pion/rtp v1.8.7 // indirect + github.com/pion/sctp v1.8.19 // indirect + github.com/pion/sdp/v3 v3.0.9 // indirect + github.com/pion/srtp/v2 v2.0.20 // indirect + github.com/pion/stun v0.6.1 // indirect + github.com/pion/transport/v2 v2.2.10 // indirect + github.com/pion/turn/v2 v2.1.6 // indirect + github.com/pion/webrtc/v3 v3.3.6 // indirect + github.com/pmezard/go-difflib v1.0.0 // indirect + github.com/prometheus/client_model v0.6.1 // indirect + github.com/prometheus/common v0.55.0 // indirect + github.com/prometheus/procfs v0.15.1 // indirect + github.com/stretchr/testify v1.9.0 // indirect + github.com/wlynxg/anet v0.0.3 // indirect + golang.org/x/crypto v0.24.0 // indirect + golang.org/x/net v0.26.0 // indirect + golang.org/x/sys v0.22.0 // indirect + google.golang.org/protobuf v1.34.2 // indirect + gopkg.in/yaml.v3 v3.0.1 // indirect +) diff --git a/go.sum b/go.sum index 244b67e..18d2500 100644 --- a/go.sum +++ b/go.sum @@ -1,2 +1,146 @@ github.com/atotto/clipboard v0.1.4 h1:EH0zSVneZPSuFR11BlR9YppQTVDbh5+16AmcJi4g1z4= github.com/atotto/clipboard v0.1.4/go.mod 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a/server/main.go b/server/main.go index 742228b..b9ee424 100644 --- a/server/main.go +++ b/server/main.go @@ -1,5 +1,7 @@ // tether-server: HTTP+SSE relay for phone↔client clipboard sync. -// MVP: single broadcast bus, no auth, no rendezvous, no WebRTC yet. +// +// v0.1: SSE-only relay with broadcast bus. +// v0.2 (this): /metrics endpoint + signaling stubs (mailbox for WebRTC SDP/ICE). package main import ( @@ -12,6 +14,10 @@ import ( "net/http" "sync" "time" + + "github.com/prometheus/client_golang/prometheus" + "github.com/prometheus/client_golang/prometheus/promauto" + "github.com/prometheus/client_golang/prometheus/promhttp" ) //go:embed web/index.html @@ -25,19 +31,16 @@ type Message struct { type bus struct { mu sync.Mutex - clients map[chan Message]string // chan → label - history []Message // last N (for new subscribers) + clients map[chan Message]string + history []Message } -func newBus() *bus { - return &bus{clients: map[chan Message]string{}} -} +func newBus() *bus { return &bus{clients: map[chan Message]string{}} } func (b *bus) subscribe(label string) chan Message { ch := make(chan Message, 16) b.mu.Lock() b.clients[ch] = label - // replay last few so newcomers see something for _, m := range b.history { select { case ch <- m: @@ -45,6 +48,7 @@ func (b *bus) subscribe(label string) chan Message { } } b.mu.Unlock() + subscribers.Inc() return ch } @@ -53,6 +57,7 @@ func (b *bus) unsubscribe(ch chan Message) { delete(b.clients, ch) b.mu.Unlock() close(ch) + subscribers.Dec() } func (b *bus) publish(m Message) { @@ -65,23 +70,75 @@ func (b *bus) publish(m Message) { for ch := range b.clients { select { case ch <- m: - default: // drop on slow consumer + default: } } } +// Prometheus metrics -------------------------------------------------------- + +var ( + messages = promauto.NewCounterVec(prometheus.CounterOpts{ + Name: "tether_messages_total", + Help: "Total messages published to the broadcast bus, by source label.", + }, []string{"source"}) + bytesIn = promauto.NewCounter(prometheus.CounterOpts{ + Name: "tether_message_bytes_total", + Help: "Total bytes of message text published.", + }) + subscribers = promauto.NewGauge(prometheus.GaugeOpts{ + Name: "tether_active_subscribers", + Help: "Number of currently-connected SSE subscribers.", + }) + publishLatency = promauto.NewHistogram(prometheus.HistogramOpts{ + Name: "tether_publish_duration_seconds", + Help: "Latency of the publish() fan-out, including channel sends.", + Buckets: prometheus.ExponentialBuckets(0.0001, 4, 8), // 0.1ms..1.6s + }) +) + +// Signaling mailbox (v0.3 WebRTC scaffolding) -------------------------------- +// Peers POST offers/answers/ICE candidates into a per-room mailbox, peers GET +// to drain. Pure relay — no SDP parsing, no peer state on server. + +type signalBox struct { + mu sync.Mutex + rooms map[string][]json.RawMessage +} + +func newSignalBox() *signalBox { return &signalBox{rooms: map[string][]json.RawMessage{}} } + +func (s *signalBox) post(room string, msg json.RawMessage) { + s.mu.Lock() + defer s.mu.Unlock() + s.rooms[room] = append(s.rooms[room], msg) + if len(s.rooms[room]) > 64 { + s.rooms[room] = s.rooms[room][len(s.rooms[room])-64:] + } +} + +func (s *signalBox) drain(room string) []json.RawMessage { + s.mu.Lock() + defer s.mu.Unlock() + out := s.rooms[room] + delete(s.rooms, room) + return out +} + +// --------------------------------------------------------------------------- + func main() { addr := flag.String("addr", ":8765", "listen address") flag.Parse() b := newBus() + sig := newSignalBox() - // Serve embedded HTML sub, _ := fs.Sub(webFS, "web") mux := http.NewServeMux() mux.Handle("/", http.FileServer(http.FS(sub))) + mux.Handle("/metrics", promhttp.Handler()) - // POST /api/send — accept a message, broadcast to subscribers mux.HandleFunc("/api/send", func(w http.ResponseWriter, r *http.Request) { if r.Method != http.MethodPost { http.Error(w, "POST only", http.StatusMethodNotAllowed) @@ -99,12 +156,16 @@ func main() { } } m.TS = time.Now().UnixMilli() + + t0 := time.Now() b.publish(m) + publishLatency.Observe(time.Since(t0).Seconds()) + messages.WithLabelValues(m.Source).Inc() + bytesIn.Add(float64(len(m.Text))) log.Printf("publish: %s len=%d", m.Source, len(m.Text)) w.WriteHeader(http.StatusNoContent) }) - // GET /api/stream — SSE feed of all published messages mux.HandleFunc("/api/stream", func(w http.ResponseWriter, r *http.Request) { fl, ok := w.(http.Flusher) if !ok { @@ -124,7 +185,6 @@ func main() { defer b.unsubscribe(ch) log.Printf("subscribe: %s", label) - // keepalive ka := time.NewTicker(30 * time.Second) defer ka.Stop() @@ -144,6 +204,35 @@ func main() { } }) + // WebRTC signaling: POST to add a message, GET to drain. + // /api/signal/ is a dumb relay — peers exchange SDP + ICE via this. + mux.HandleFunc("/api/signal/", func(w http.ResponseWriter, r *http.Request) { + room := r.URL.Path[len("/api/signal/"):] + if room == "" { + http.Error(w, "missing room", http.StatusBadRequest) + return + } + switch r.Method { + case http.MethodPost: + body, _ := func() (json.RawMessage, error) { + var raw json.RawMessage + err := json.NewDecoder(r.Body).Decode(&raw) + return raw, err + }() + sig.post(room, body) + w.WriteHeader(http.StatusNoContent) + case http.MethodGet: + out := sig.drain(room) + if out == nil { + out = []json.RawMessage{} + } + w.Header().Set("Content-Type", "application/json") + json.NewEncoder(w).Encode(out) + default: + http.Error(w, "POST or GET", http.StatusMethodNotAllowed) + } + }) + mux.HandleFunc("/healthz", func(w http.ResponseWriter, r *http.Request) { w.Write([]byte("ok")) })