feat: Wasm go sdk support process streaming body (#933)

plugins/wasm-go/extensions/streaming-body-example/main.go

@@ -0,0 +1,55 @@
+// 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 main
+
+import (
+	"github.com/higress-group/proxy-wasm-go-sdk/proxywasm"
+	"github.com/higress-group/proxy-wasm-go-sdk/proxywasm/types"
+
+	"github.com/alibaba/higress/plugins/wasm-go/pkg/wrapper"
+)
+
+func main() {
+	wrapper.SetCtx(
+		"streaming-body-example",
+		wrapper.ProcessRequestHeadersBy(onHttpRequestHeaders),
+		wrapper.ProcessStreamingRequestBodyBy(onHttpRequestBody),
+		wrapper.ProcessResponseHeadersBy(onHttpResponseHeaders),
+		wrapper.ProcessStreamingResponseBodyBy(onHttpResponseBody),
+	)
+}
+
+type Config struct {
+}
+
+func onHttpRequestHeaders(ctx wrapper.HttpContext, config Config, log wrapper.Log) types.Action {
+	proxywasm.RemoveHttpRequestHeader("content-length")
+	return types.ActionContinue
+}
+
+func onHttpRequestBody(ctx wrapper.HttpContext, config Config, chunk []byte, isLastChunk bool, log wrapper.Log) []byte {
+	log.Infof("receive request body chunk:%s, isLastChunk:%v", chunk, isLastChunk)
+	return []byte("test\n")
+}
+
+func onHttpResponseHeaders(ctx wrapper.HttpContext, config Config, log wrapper.Log) types.Action {
+	proxywasm.RemoveHttpResponseHeader("content-length")
+	return types.ActionContinue
+}
+
+func onHttpResponseBody(ctx wrapper.HttpContext, config Config, chunk []byte, isLastChunk bool, log wrapper.Log) []byte {
+	log.Infof("receive response body chunk:%s, isLastChunk:%v", chunk, isLastChunk)
+	return []byte("test\n")
+}