Improve status reporter

.gitignore

@@ -24,3 +24,4 @@ _testmain.go
 *.prof
 *.tar.gz
 *.zip
+relaysrv

protocol_listener.go

@@ -7,6 +7,7 @@ import (
 	"log"
 	"net"
 	"sync"
+	"sync/atomic"
 	"time"
 
 	syncthingprotocol "github.com/syncthing/protocol"
@@ -17,6 +18,7 @@ import (
 var (
 	outboxesMut    = sync.RWMutex{}
 	outboxes       = make(map[syncthingprotocol.DeviceID]chan interface{})
+	numConnections int64
 )
 
 func protocolListener(addr string, config *tls.Config) {
@@ -122,7 +124,7 @@ func protocolConnectionHandler(tcpConn net.Conn, config *tls.Config) {
 				outboxesMut.RUnlock()
 				if !ok {
 					if debug {
-						log.Println(id, "is looking", requestedPeer, "which does not exist")
+						log.Println(id, "is looking for", requestedPeer, "which does not exist")
 					}
 					protocol.WriteMessage(conn, protocol.ResponseNotFound)
 					conn.Close()
@@ -219,6 +221,9 @@ func protocolConnectionHandler(tcpConn net.Conn, config *tls.Config) {
 }
 
 func messageReader(conn net.Conn, messages chan<- interface{}, errors chan<- error) {
+	atomic.AddInt64(&numConnections, 1)
+	defer atomic.AddInt64(&numConnections, -1)
+
 	for {
 		msg, err := protocol.ReadMessage(conn)
 		if err != nil {

session.go

@@ -110,30 +110,31 @@ func (s *session) Serve() {
 			close(s.conns)
 
 			if debug {
-				log.Println("Session", s, "starting between", conns[0].RemoteAddr(), conns[1].RemoteAddr())
+				log.Println("Session", s, "starting between", conns[0].RemoteAddr(), "and", conns[1].RemoteAddr())
 			}
 
 			wg := sync.WaitGroup{}
 			wg.Add(2)
 
-			errors := make(chan error, 2)
-
+			var err0 error
 			go func() {
-				errors <- s.proxy(conns[0], conns[1])
+				err0 = s.proxy(conns[0], conns[1])
 				wg.Done()
 			}()
 
+			var err1 error
 			go func() {
-				errors <- s.proxy(conns[1], conns[0])
+				err1 = s.proxy(conns[1], conns[0])
 				wg.Done()
 			}()
 
 			wg.Wait()
 
 			if debug {
-				log.Println("Session", s, "ended, outcomes:", <-errors, <-errors)
+				log.Println("Session", s, "ended, outcomes:", err0, "and", err1)
 			}
 			goto done
+
 		case <-timedout:
 			if debug {
 				log.Println("Session", s, "timed out")

status.go

@@ -6,9 +6,14 @@ import (
 	"net/http"
 	"runtime"
 	"sync/atomic"
+	"time"
 )
 
+var rc *rateCalculator
+
 func statusService(addr string) {
+	rc = newRateCalculator(360, 10*time.Second, &bytesProxied)
+
 	http.HandleFunc("/status", getStatus)
 	if err := http.ListenAndServe(addr, nil); err != nil {
 		log.Fatal(err)
@@ -21,12 +26,21 @@ func getStatus(w http.ResponseWriter, r *http.Request) {
 	sessionMut.Lock()
 	status["numSessions"] = len(sessions)
 	sessionMut.Unlock()
+	status["numConnections"] = atomic.LoadInt64(&numConnections)
 	status["numProxies"] = atomic.LoadInt64(&numProxies)
 	status["bytesProxied"] = atomic.LoadInt64(&bytesProxied)
 	status["goVersion"] = runtime.Version()
 	status["goOS"] = runtime.GOOS
 	status["goAarch"] = runtime.GOARCH
 	status["goMaxProcs"] = runtime.GOMAXPROCS(-1)
+	status["kbps10s1m5m15m30m60m"] = []int64{
+		rc.rate(10/10) * 8 / 1000,
+		rc.rate(60/10) * 8 / 1000,
+		rc.rate(5*60/10) * 8 / 1000,
+		rc.rate(15*60/10) * 8 / 1000,
+		rc.rate(30*60/10) * 8 / 1000,
+		rc.rate(60*60/10) * 8 / 1000,
+	}
 
 	bs, err := json.MarshalIndent(status, "", "    ")
 	if err != nil {
@@ -37,3 +51,42 @@ func getStatus(w http.ResponseWriter, r *http.Request) {
 	w.Header().Set("Content-Type", "application/json")
 	w.Write(bs)
 }
+
+type rateCalculator struct {
+	rates   []int64
+	prev    int64
+	counter *int64
+}
+
+func newRateCalculator(keepIntervals int, interval time.Duration, counter *int64) *rateCalculator {
+	r := &rateCalculator{
+		rates:   make([]int64, keepIntervals),
+		counter: counter,
+	}
+
+	go r.updateRates(interval)
+
+	return r
+}
+
+func (r *rateCalculator) updateRates(interval time.Duration) {
+	for {
+		now := time.Now()
+		next := now.Truncate(interval).Add(interval)
+		time.Sleep(next.Sub(now))
+
+		cur := atomic.LoadInt64(r.counter)
+		rate := int64(float64(cur-r.prev) / interval.Seconds())
+		copy(r.rates[1:], r.rates)
+		r.rates[0] = rate
+		r.prev = cur
+	}
+}
+
+func (r *rateCalculator) rate(periods int) int64 {
+	var tot int64
+	for i := 0; i < periods; i++ {
+		tot += r.rates[i]
+	}
+	return tot / int64(periods)
+}