Add plugins (#27)

plugins/wasm-go/pkg/wrapper/request_wrapper.go

@@ -0,0 +1,53 @@
+// Copyright (c) 2022 Alibaba Group Holding Ltd.
+//
+// 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.
+
+package wrapper
+
+import "github.com/tetratelabs/proxy-wasm-go-sdk/proxywasm"
+
+func GetRequestScheme() string {
+	scheme, err := proxywasm.GetHttpRequestHeader(":scheme")
+	if err != nil {
+		proxywasm.LogError("parse request scheme failed")
+		return ""
+	}
+	return scheme
+}
+
+func GetRequestHost() string {
+	host, err := proxywasm.GetHttpRequestHeader(":authority")
+	if err != nil {
+		proxywasm.LogError("parse request host failed")
+		return ""
+	}
+	return host
+}
+
+func GetRequestPath() string {
+	path, err := proxywasm.GetHttpRequestHeader(":path")
+	if err != nil {
+		proxywasm.LogError("parse request path failed")
+		return ""
+	}
+	return path
+}
+
+func GetRequestMethod() string {
+	method, err := proxywasm.GetHttpRequestHeader(":method")
+	if err != nil {
+		proxywasm.LogError("parse request path failed")
+		return ""
+	}
+	return method
+}