Question

我正在使用Netty服务器，我遇到的问题是我创建的自定义处理程序，用于通过HTTP PUT请求接收文件上传。当我一次发送几个文件时，一切似乎工作正常，但是在大约300个连接之后服务器似乎“破坏”。然后，服务器将在每个收到的请求上抛出follow异常。在此开始发生后，服务器不再处理请求并需要重新启动：

    java.lang.IllegalStateException: cannot send more responses than requests
        at org.jboss.netty.handler.codec.http.HttpContentEncoder.writeRequested(HttpContentEncoder.java:104)
        at org.jboss.netty.handler.execution.ExecutionHandler.handleDownstream(ExecutionHandler.java:165)
        at org.jboss.netty.channel.Channels.write(Channels.java:605)
        at org.jboss.netty.channel.Channels.write(Channels.java:572)
....

这是我的处理程序源channelRecieved，我处理的所有请求都是分块的，所以我将在下面包含这些方法：

@Override
public void messageReceived(ChannelHandlerContext context, MessageEvent event) throws Exception {
    try {
        log.trace("Message recieved");
        if (newMessage) {
            log.trace("New message");
            HttpRequest request = (HttpRequest) event.getMessage();
            setDestinationFile(context, request);
            newMessage = false;
            if (request.isChunked()) {
                log.trace("Chunked request, set readingChunks true and create byte buffer");
                requestContentStream = new ByteArrayOutputStream();
                readingChunks = true;
                return;
            } else {
                log.trace("Request not chunked");
                writeNonChunkedFile(request);
                requestComplete(event);
                return;
            }
        } else if (readingChunks){
            log.trace("Reading chunks");
            HttpChunk chunk = (HttpChunk) event.getMessage();
            if (chunk.isLast()) {
                log.trace("Read last chunk");
                readingChunks = false;
                writeChunkedFile();
                requestComplete(event);
                return;
            } else {
                log.trace("Buffering chunk content to byte buffer");
                requestContentStream.write(chunk.getContent().array());
                return;
            }
            // should not happen
        } else {
            log.error("Error handling of MessageEvent, expecting a new message or a chunk from a previous message");
        }
    } catch (Exception ex) {
        log.error("Exception: [" + ex + "]");
        sendError(context, INTERNAL_SERVER_ERROR);
    }
}

这就是我编写分块请求的方式：

private void writeChunkedFile() throws IOException {
    log.trace("Writing chunked file");
    byte[] data = requestContentStream.toByteArray();
    FileOutputStream fos = new FileOutputStream(destinationFile);
    fos.write(data);
    fos.close();
    log.debug("File upload complete, [chunked], path: [" + destinationFile.getAbsolutePath() + "] size: [" + destinationFile.length() + "] bytes");
}

这是我发送响应并关闭连接的方式：

private void requestComplete(MessageEvent event) {
    log.trace("Request complete");
    HttpResponse response = new DefaultHttpResponse(HTTP_1_1, OK);
    Channel channel = event.getChannel();
    ChannelFuture cf = channel.write(response);
    cf.addListener(ChannelFutureListener.CLOSE);
}

我在requestComplete中尝试过一些东西，其中一个只是channel.close（），似乎没什么帮助。还有其他想法或想法吗？

这是我的管道：

@Override
public ChannelPipeline getPipeline() throws Exception {
    final ChannelPipeline pipeline = pipeline();
    pipeline.addLast("decoder", new HttpRequestDecoder());
    pipeline.addLast("encoder", new HttpResponseEncoder());
    pipeline.addLast("deflater", new HttpContentCompressor());
    pipeline.addLast("ExecutionHandler", executionHandler);

pipeline.addLast（“handler”，new FileUploadHandler（））; 回流管道; }

感谢您的任何想法或想法

编辑：在管道中的deflator和handler之间进行日志记录时的示例日志条目：

2012-03-23T07:46:40.993 [New I/O server worker #1-6] WARN  NbEvents [c.c.c.r.d.l.s.h.SbApiMessageLogger.writeRequested] [] - Sending [DefaultHttpResponse(chunked: false)
HTTP/1.1 100 Continue]
2012-03-23T07:46:40.995 [New I/O server worker #1-6] WARN  NbEvents [c.c.c.r.d.l.s.h.SbApiMessageLogger.writeRequested] [] - Sending [DefaultHttpResponse(chunked: false)
HTTP/1.1 500 Internal Server Error
Content-Type: text/plain; charset=UTF-8]
2012-03-23T07:46:41.000 [New I/O server worker #1-7] DEBUG NbEvents [c.c.c.r.d.l.s.h.SbApiMessageLogger.messageReceived] [] - Received [PUT /a/deeper/path/testFile.txt HTTP/1.1
User-Agent: curl/7.19.7 (x86_64-redhat-linux-gnu) libcurl/7.19.7 NSS/3.12.9.0 zlib/1.2.3 libidn/1.18 libssh2/1.2.2
Host: 192.168.0.1:8080
Accept: */*
Content-Length: 256000
Expect: 100-continue

Answer 1

这最终导致我的实现出现问题，与此处发布的任何代码无关，此处发布的逻辑似乎合理且工作正常。也就是说，非常感谢所有人的有益评论！

Netty，HTTP PUT请求的自定义处理程序问题“无法发送比请求更多的响应”

1 个答案: