exhttp: Add IsNetworkError helper

Author: hifi

exhttp/networkerror.go

@@ -0,0 +1,43 @@
+// Copyright (c) 2025 Tulir Asokan
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+package exhttp
+
+import (
+	"errors"
+	"net"
+	"syscall"
+
+	"golang.org/x/net/http2"
+)
+
+func IsNetworkError(err error) bool {
+	for err != nil {
+		if _, ok := err.(net.Error); ok {
+			return true
+		} else if _, ok := err.(*net.OpError); ok {
+			return true
+		} else if errno, ok := err.(syscall.Errno); ok {
+			// common errnos for network related operations
+			return errno == syscall.ENETDOWN ||
+				errno == syscall.ENETUNREACH ||
+				errno == syscall.ENETRESET ||
+				errno == syscall.ECONNABORTED ||
+				errno == syscall.ECONNRESET ||
+				errno == syscall.ENOBUFS ||
+				errno == syscall.ETIMEDOUT ||
+				errno == syscall.ECONNREFUSED ||
+				errno == syscall.EHOSTDOWN ||
+				errno == syscall.EHOSTUNREACH
+		} else if errors.As(err, &http2.StreamError{}); ok {
+			return true
+		}
+
+		err = errors.Unwrap(err)
+	}
+
+	return false
+}

go.mod

@@ -11,8 +11,9 @@ require (
 	github.com/rs/zerolog v1.33.0
 	github.com/stretchr/testify v1.10.0
 	golang.org/x/exp v0.0.0-20250305212735-054e65f0b394
-	golang.org/x/sys v0.31.0
-	golang.org/x/text v0.23.0
+	golang.org/x/net v0.40.0
+	golang.org/x/sys v0.33.0
+	golang.org/x/text v0.25.0
 	google.golang.org/protobuf v1.36.5
 	gopkg.in/yaml.v3 v3.0.1
 )

go.sum

@@ -28,13 +28,15 @@ github.com/stretchr/testify v1.10.0 h1:Xv5erBjTwe/5IxqUQTdXv5kgmIvbHo3QQyRwhJsOf
 github.com/stretchr/testify v1.10.0/go.mod h1:r2ic/lqez/lEtzL7wO/rwa5dbSLXVDPFyf8C91i36aY=
 golang.org/x/exp v0.0.0-20250305212735-054e65f0b394 h1:nDVHiLt8aIbd/VzvPWN6kSOPE7+F/fNFDSXLVYkE/Iw=
 golang.org/x/exp v0.0.0-20250305212735-054e65f0b394/go.mod h1:sIifuuw/Yco/y6yb6+bDNfyeQ/MdPUy/hKEMYQV17cM=
+golang.org/x/net v0.40.0 h1:79Xs7wF06Gbdcg4kdCCIQArK11Z1hr5POQ6+fIYHNuY=
+golang.org/x/net v0.40.0/go.mod h1:y0hY0exeL2Pku80/zKK7tpntoX23cqL3Oa6njdgRtds=
 golang.org/x/sys v0.0.0-20220811171246-fbc7d0a398ab/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/sys v0.6.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/sys v0.12.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
-golang.org/x/sys v0.31.0 h1:ioabZlmFYtWhL+TRYpcnNlLwhyxaM9kWTDEmfnprqik=
-golang.org/x/sys v0.31.0/go.mod h1:BJP2sWEmIv4KK5OTEluFJCKSidICx8ciO85XgH3Ak8k=
-golang.org/x/text v0.23.0 h1:D71I7dUrlY+VX0gQShAThNGHFxZ13dGLBHQLVl1mJlY=
-golang.org/x/text v0.23.0/go.mod h1:/BLNzu4aZCJ1+kcD0DNRotWKage4q2rGVAg4o22unh4=
+golang.org/x/sys v0.33.0 h1:q3i8TbbEz+JRD9ywIRlyRAQbM0qF7hu24q3teo2hbuw=
+golang.org/x/sys v0.33.0/go.mod h1:BJP2sWEmIv4KK5OTEluFJCKSidICx8ciO85XgH3Ak8k=
+golang.org/x/text v0.25.0 h1:qVyWApTSYLk/drJRO5mDlNYskwQznZmkpV2c8q9zls4=
+golang.org/x/text v0.25.0/go.mod h1:WEdwpYrmk1qmdHvhkSTNPm3app7v4rsT8F2UD6+VHIA=
 google.golang.org/protobuf v1.36.5 h1:tPhr+woSbjfYvY6/GPufUoYizxw1cF/yFoxJ2fmpwlM=
 google.golang.org/protobuf v1.36.5/go.mod h1:9fA7Ob0pmnwhb644+1+CVWFRbNajQ6iRojtC/QF5bRE=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405 h1:yhCVgyC4o1eVCa2tZl7eS0r+SDo693bJlVdllGtEeKM=