proxy: imp docs

AdguardTeam · Oct 31, 2023 · 3d437e6 · 3d437e6
1 parent 543a9a9
commit 3d437e6
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Showing 2 changed files with 6 additions and 3 deletions.
diff --git a/proxy/dnscontext.go b/proxy/dnscontext.go
@@ -63,9 +63,8 @@ type DNSContext struct {
 	// localIP - local IP address (for UDP socket to call udpMakeOOBWithSrc)
 	localIP net.IP
 
-	// QueryDuration is the duration of the successful query from an upstream
-	// DNS server or a fallback DNS server, if exchange with an upstream wasn't
-	// successful.
+	// QueryDuration is the duration of a successful query to an upstream
+	// server or, if the upstream server is unavailable, to a fallback server.
 	QueryDuration time.Duration
 
 	// DoQVersion is the DoQ protocol version. It can (and should) be read from

diff --git a/proxy/proxy.go b/proxy/proxy.go
@@ -534,6 +534,10 @@ func (p *Proxy) replyFromUpstream(d *DNSContext) (ok bool, err error) {
 		resp, u, err = upstream.ExchangeParallel(upstreams, req)
 	}
 
+	if err != nil {
+		log.Debug("proxy: replying from %s: %s", src, err)
+	}
+
 	if resp != nil {
 		rtt := time.Since(start)
 		log.Debug("proxy: replying from %s: rtt is %s", src, rtt)