ipn/wg: note latest handshake time

Author: ignoramous

intra/ipn/wg/stats.go

@@ -15,7 +15,6 @@ package wg
 
 import (
 	"errors"
-	"math"
 	"strconv"
 	"strings"
 	"time"
@@ -98,12 +97,10 @@ func (s *ifstats) TotalTx() int64 {
 	return total
 }
 
-func (s *ifstats) LeastRecentHandshake() int64 {
-	least := int64(math.MaxInt64)
+func (s *ifstats) LatestRecentHandshake() int64 {
+	least := int64(0)
 	for _, stats := range s.stats {
-		if stats.LatestHandshakeEpochMillis < least {
-			least = stats.LatestHandshakeEpochMillis
-		}
+		least = max(least, stats.LatestHandshakeEpochMillis)
 	}
 	return least
 }

intra/ipn/wgproxy.go

@@ -679,7 +679,7 @@ func (w *wgproxy) Stats() (out x.Stats) {
 	stat := wg.ReadStats(w.id, cfg)
 	out.Rx = stat.TotalRx()
 	out.Tx = stat.TotalTx()
-	out.LastOK = stat.LeastRecentHandshake()
+	out.LastOK = stat.LatestRecentHandshake()
 	out.Addr = w.IfAddr() // may be empty
 	out.ErrRx = w.errRx
 	out.ErrTx = w.errTx