use net.ErrClosed (for Go 1.16)

internal/qerr/errors.go

@@ -29,11 +29,6 @@ func NewCryptoError(tlsAlert uint8, errorMessage string) *TransportError {
 	}
 }
 
-func (e *TransportError) Is(target error) bool {
-	_, ok := target.(*TransportError)
-	return ok
-}
-
 func (e *TransportError) Error() string {
 	str := e.ErrorCode.String()
 	if e.FrameType != 0 {
@@ -63,11 +58,6 @@ type ApplicationError struct {
 
 var _ error = &ApplicationError{}
 
-func (e *ApplicationError) Is(target error) bool {
-	_, ok := target.(*ApplicationError)
-	return ok
-}
-
 func (e *ApplicationError) Error() string {
 	if len(e.ErrorMessage) == 0 {
 		return fmt.Sprintf("Application error %#x", e.ErrorCode)
@@ -82,10 +72,6 @@ var _ error = &IdleTimeoutError{}
 func (e *IdleTimeoutError) Timeout() bool   { return true }
 func (e *IdleTimeoutError) Temporary() bool { return false }
 func (e *IdleTimeoutError) Error() string   { return "timeout: no recent network activity" }
-func (e *IdleTimeoutError) Is(target error) bool {
-	_, ok := target.(*IdleTimeoutError)
-	return ok
-}
 
 type HandshakeTimeoutError struct{}
 
@@ -94,10 +80,6 @@ var _ error = &HandshakeTimeoutError{}
 func (e *HandshakeTimeoutError) Timeout() bool   { return true }
 func (e *HandshakeTimeoutError) Temporary() bool { return false }
 func (e *HandshakeTimeoutError) Error() string   { return "timeout: handshake did not complete in time" }
-func (e *HandshakeTimeoutError) Is(target error) bool {
-	_, ok := target.(*HandshakeTimeoutError)
-	return ok
-}
 
 // A VersionNegotiationError occurs when the client and the server can't agree on a QUIC version.
 type VersionNegotiationError struct {
@@ -109,11 +91,6 @@ func (e *VersionNegotiationError) Error() string {
 	return fmt.Sprintf("no compatible QUIC version found (we support %s, server offered %s)", e.Ours, e.Theirs)
 }
 
-func (e *VersionNegotiationError) Is(target error) bool {
-	_, ok := target.(*VersionNegotiationError)
-	return ok
-}
-
 // A StatelessResetError occurs when we receive a stateless reset.
 type StatelessResetError struct {
 	Token protocol.StatelessResetToken
@@ -125,10 +102,5 @@ func (e *StatelessResetError) Error() string {
 	return fmt.Sprintf("received a stateless reset with token %x", e.Token)
 }
 
-func (e *StatelessResetError) Is(target error) bool {
-	_, ok := target.(*StatelessResetError)
-	return ok
-}
-
 func (e *StatelessResetError) Timeout() bool   { return false }
 func (e *StatelessResetError) Temporary() bool { return true }

internal/qerr/errors_go116.go

@@ -0,0 +1,55 @@
+// +build go1.16
+
+package qerr
+
+import (
+	"net"
+)
+
+func (e *TransportError) Is(target error) bool {
+	_, ok := target.(*TransportError)
+	if ok {
+		return true
+	}
+	return target == net.ErrClosed
+}
+
+func (e *ApplicationError) Is(target error) bool {
+	_, ok := target.(*ApplicationError)
+	if ok {
+		return true
+	}
+	return target == net.ErrClosed
+}
+
+func (e *IdleTimeoutError) Is(target error) bool {
+	_, ok := target.(*IdleTimeoutError)
+	if ok {
+		return true
+	}
+	return target == net.ErrClosed
+}
+
+func (e *HandshakeTimeoutError) Is(target error) bool {
+	_, ok := target.(*HandshakeTimeoutError)
+	if ok {
+		return true
+	}
+	return target == net.ErrClosed
+}
+
+func (e *VersionNegotiationError) Is(target error) bool {
+	_, ok := target.(*VersionNegotiationError)
+	if ok {
+		return true
+	}
+	return target == net.ErrClosed
+}
+
+func (e *StatelessResetError) Is(target error) bool {
+	_, ok := target.(*StatelessResetError)
+	if ok {
+		return true
+	}
+	return target == net.ErrClosed
+}

internal/qerr/errors_go116_test.go

@@ -0,0 +1,22 @@
+// +build go1.16
+
+package qerr
+
+import (
+	"errors"
+	"net"
+
+	. "github.com/onsi/ginkgo"
+	. "github.com/onsi/gomega"
+)
+
+var _ = Describe("QUIC Errors", func() {
+	It("says that errors are net.ErrClosed errors", func() {
+		Expect(errors.Is(&TransportError{}, net.ErrClosed)).To(BeTrue())
+		Expect(errors.Is(&ApplicationError{}, net.ErrClosed)).To(BeTrue())
+		Expect(errors.Is(&IdleTimeoutError{}, net.ErrClosed)).To(BeTrue())
+		Expect(errors.Is(&HandshakeTimeoutError{}, net.ErrClosed)).To(BeTrue())
+		Expect(errors.Is(&StatelessResetError{}, net.ErrClosed)).To(BeTrue())
+		Expect(errors.Is(&VersionNegotiationError{}, net.ErrClosed)).To(BeTrue())
+	})
+})

internal/qerr/errors_not_go116.go

@@ -0,0 +1,33 @@
+// +build !go1.16
+
+package qerr
+
+func (e *TransportError) Is(target error) bool {
+	_, ok := target.(*TransportError)
+	return ok
+}
+
+func (e *ApplicationError) Is(target error) bool {
+	_, ok := target.(*ApplicationError)
+	return ok
+}
+
+func (e *IdleTimeoutError) Is(target error) bool {
+	_, ok := target.(*IdleTimeoutError)
+	return ok
+}
+
+func (e *HandshakeTimeoutError) Is(target error) bool {
+	_, ok := target.(*HandshakeTimeoutError)
+	return ok
+}
+
+func (e *VersionNegotiationError) Is(target error) bool {
+	_, ok := target.(*VersionNegotiationError)
+	return ok
+}
+
+func (e *StatelessResetError) Is(target error) bool {
+	_, ok := target.(*StatelessResetError)
+	return ok
+}