feat: add wasm for client transport

Signed-off-by: Icemap <qizhi.wang@pingcap.com>

client/pkg/transport/sockopt_unix.go

@@ -12,7 +12,7 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-//go:build !windows && !solaris
+//go:build !windows && !solaris && !wasm
 
 package transport
 

client/pkg/transport/sockopt_wasm.go

@@ -0,0 +1,30 @@
+// Copyright 2021 The etcd Authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+//go:build wasm
+
+package transport
+
+import (
+	"errors"
+	"syscall"
+)
+
+func setReusePort(network, address string, c syscall.RawConn) error {
+	return errors.New("port reuse is not supported on WASM")
+}
+
+func setReuseAddress(network, addr string, conn syscall.RawConn) error {
+	return errors.New("address reuse is not supported on WASM")
+}