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com.taobao.arthas.grpcweb.proxy.SendGrpcWebResponse Maven / Gradle / Ivy
/*
* Copyright 2020 Google LLC
*
* 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 com.taobao.arthas.grpcweb.proxy;
import com.taobao.arthas.grpcweb.proxy.MessageUtils.ContentType;
import io.grpc.Metadata;
import io.grpc.Status;
import io.netty.channel.ChannelFuture;
import io.netty.channel.ChannelFutureListener;
import io.netty.channel.ChannelHandlerContext;
import io.netty.handler.codec.http.*;
import io.netty.handler.stream.ChunkedStream;
import com.alibaba.arthas.deps.org.slf4j.Logger;
import com.alibaba.arthas.deps.org.slf4j.LoggerFactory;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.lang.invoke.MethodHandles;
import java.util.Base64;
import java.util.Map;
/**
*
* * https://github.com/grpc/grpc/blob/master/doc/PROTOCOL-WEB.md
* * https://github.com/grpc/grpc/blob/master/doc/PROTOCOL-HTTP2.md
*
* 据协议和抓包分析，grpc-web 回应需要以 HTTP chunk数据包，包装 grpc 本身的数据。
*
* grpc-web 的 http1.1 Response 由三部分组成：
* 1. headers , 返回 status 总是 200
* 2. data chunk ，可能多个
* 3. trailer chunk , grpc的 grpc-status, grpc-message 在这里
*
*
*
* @author hengyunabc 2023-09-06
*
*/
class SendGrpcWebResponse {
private static final Logger logger = LoggerFactory.getLogger(MethodHandles.lookup().lookupClass().getName());
private final String contentType;
/**
* 回应的 http1.1 header 是否已发送
*/
private boolean isHeaderSent = false;
/**
* 所有的 grpc message 都会转换为一个 HTTP Chunk，所有的 Chunk 发送完之后，需要发送一个空的 Chunk 结束
*/
private boolean isEndChunkSent = false;
/**
* 在 grpc 协议里，在发送完 DATA 后，最后可能发送一个 trailer，它也需要转换为 HTTP Chunk
*/
private boolean isTrailerSent = false;
/**
* 客户端主动断开连接后,需要断开相应的grpc连接, grpc服务端才能停止监听
*/
private Boolean isSuccessSendData = true;
private ChannelHandlerContext ctx;
SendGrpcWebResponse(ChannelHandlerContext ctx, FullHttpRequest req) {
HttpHeaders headers = req.headers();
contentType = headers.get(HttpHeaderNames.CONTENT_TYPE);
this.ctx = ctx;
}
synchronized void writeHeaders(Metadata headers) {
if (isHeaderSent) {
return;
}
// 发送 http1.1 开头部分的内容
DefaultHttpResponse response = new DefaultHttpResponse(HttpVersion.HTTP_1_1, HttpResponseStatus.OK);
response.headers().set(HttpHeaderNames.CONTENT_TYPE, contentType).set(HttpHeaderNames.TRANSFER_ENCODING,
"chunked");
CorsUtils.updateCorsHeader(response.headers());
if (headers != null) {
Map ht = MetadataUtil.getHttpHeadersFromMetadata(headers);
for (String key : ht.keySet()) {
response.headers().set(key, ht.get(key));
}
}
logger.debug("write headers: {}", response);
ctx.writeAndFlush(response);
isHeaderSent = true;
}
synchronized void returnUnimplementedStatusCode(String className) {
writeHeaders(null);
writeTrailer(
Status.UNIMPLEMENTED.withDescription("Can not find service impl, check dep, service: " + className),
null);
}
// 发送最后的 http chunked 空块
private void writeEndChunk() {
if (isEndChunkSent) {
return;
}
LastHttpContent end = new DefaultLastHttpContent();
ctx.writeAndFlush(end);
isEndChunkSent = true;
}
synchronized void writeError(Status s) {
writeHeaders(null);
writeTrailer(s, null);
}
synchronized void writeTrailer(Status status, Metadata trailer) {
if (isTrailerSent) {
return;
}
StringBuffer sb = new StringBuffer();
if (trailer != null) {
Map ht = MetadataUtil.getHttpHeadersFromMetadata(trailer);
for (String key : ht.keySet()) {
sb.append(String.format("%s:%s\r\n", key, ht.get(key)));
}
}
sb.append(String.format("grpc-status:%d\r\n", status.getCode().value()));
if (status.getDescription() != null && !status.getDescription().isEmpty()) {
sb.append(String.format("grpc-message:%s\r\n", status.getDescription()));
}
writeResponse(sb.toString().getBytes(), MessageFramer.Type.TRAILER);
isTrailerSent = true;
writeEndChunk();
}
synchronized boolean writeResponse(byte[] out) {
return writeResponse(out, MessageFramer.Type.DATA);
}
private boolean writeResponse(byte[] out, MessageFramer.Type type) {
if (isTrailerSent) {
logger.error("grpcweb trailer sented, writeResponse can not be called, framer type: {}", type);
return false;
}
try {
// PUNT multiple frames not handled
byte[] prefix = new MessageFramer().getPrefix(out, type);
ByteArrayOutputStream oStream = new ByteArrayOutputStream();
// binary encode if it is "text" content type
if (MessageUtils.getContentType(contentType) == ContentType.GRPC_WEB_TEXT) {
byte[] concated = new byte[out.length + 5];
System.arraycopy(prefix, 0, concated, 0, 5);
System.arraycopy(out, 0, concated, 5, out.length);
oStream.write(Base64.getEncoder().encode(concated));
} else {
oStream.write(prefix);
oStream.write(out);
}
byte[] byteArray = oStream.toByteArray();
InputStream dataStream = new ByteArrayInputStream(byteArray);
ChunkedStream chunkedStream = new ChunkedStream(dataStream);
SingleHttpChunkedInput httpChunkedInput = new SingleHttpChunkedInput(chunkedStream);
ChannelFuture channelFuture = ctx.writeAndFlush(httpChunkedInput);
ChannelFutureListener channelFutureListener = new ChannelFutureListener() {
@Override
public void operationComplete(ChannelFuture future) {
if (!future.isSuccess()) {
// 写入操作失败
isSuccessSendData = false;
}
}
};
channelFuture.addListener(channelFutureListener);
return isSuccessSendData;
} catch (IOException e) {
logger.error("write grpcweb response error, framer type: {}", type, e);
return false;
}
}
}
