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fawdlstty / libfv

libfv is C++20 header-only network library, support TCP/SSL/Http/websocket server and client
http://libfv.fawdlstty.com/en_us/
MIT License
126 stars 16 forks source link

发现前后两次返回数据粘连的情况，请看第一行 #5

Closed sudavida closed 2 years ago

sudavida commented 2 years ago

"tickSz":"0.0001","uly":"ZRX-USDT"}],"msg":""}HTTP/1.1 200 Date: Thu, 19 May 2022 16:00:13 GMT Content-Type: application/json Content-Length: 77679 Connection: keep-alive Vary: Accept-Encoding Set-Cookie: locale=en-US; Max-Age=604800; Expires=Thu, 26-May-2022 16:00:13 GMT; Path=/ Set-Cookie: locale=en-US; Max-Age=604800; Expires=Thu, 26-May-2022 16:00:13 GMT; Path=/ X-BrokerID: 0 Strict-Transport-Security: max-age=63072000; includeSubdomains; preload

{"code":"0","data":[{"alias":"","baseCcy":"","category":"1","ctMult":"1","ctType":"inverse"

sudavida commented 2 years ago

导致数据解析失败

sudavida commented 2 years ago

数据长度？结束位置？看下哪里的问题

sudavida commented 2 years ago

这也可能是前面出乱码的原因

sudavida commented 2 years ago

所谓的粘包问题

fawdlstty commented 2 years ago

"tickSz":"0.0001","uly":"ZRX-USDT"}],"msg":""}这一段，上一个请求是否已正确读出并使用？

sudavida commented 2 years ago

没有，和后面的数据一起使用的

fawdlstty commented 2 years ago

上一个请求ContentLength不对？

sudavida commented 2 years ago

也有这个可能，但是读取数据还需要其他方式进行结束检查。中间是否有http协议开始，头部开始等

fawdlstty commented 2 years ago

这块检查不应由库来操作。http返回内容完全可以再嵌套一个http报文。再做检查则无法处理这种正确的返回格式

sudavida commented 2 years ago 
inline Task<std::string> IConn::ReadCount (size_t _count) {
    if (_count == 0)
        co_return "";
    std::string _tmp = "";
    while (TmpData.size () < _count) {
        char _buf [1024];
        size_t _readed = co_await RecvImpl (_buf, sizeof (_buf));
       // std::string_view { _buf, _readed }; 如果放在这里检查呢
        TmpData += std::string_view { _buf, _readed };

    }
    _tmp = TmpData.substr (0, _count);
    TmpData.erase (0, _count);
    co_return _tmp;
}
fawdlstty commented 2 years ago

“做检查则无法处理正确的返回格式”

sudavida commented 2 years ago

TmpData，这里是一直暂存数据流吧，如果自己检查，正确位置截断，能不能解决问题

fawdlstty commented 2 years ago

想要具体解决问题，首先需要调查上一个包的ContentLength对不对。如果不对，那么库无法正确处理。想要手工处理非标准HTTP报文，建议自建tcp/ssl客户端然后手工发request请求、手工解析response

sudavida commented 2 years ago

如果放在response，已经在业务函数处理过程中了，多余部分也只能丢掉，可能不是合理的

sudavida commented 2 years ago 
    while (TmpData.size () < _count) {
        char _buf [1024];
        size_t read_size = _count - TmpData.size ();//我改了这里
        read_size = read_size>1024? 1024 : read_size;//
        size_t _readed = co_await RecvImpl (_buf, read_size);//
        TmpData += std::string_view { _buf, _readed };//
    }
   原来实际上读取数据超出了_count，如果后面有数据，就会发生错误，粘包
sudavida commented 2 years ago

改了以后，有时取到的content_length会大于实际的数据长度 ： 77679:77679

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200
sudavida commented 2 years ago

前面改了那个还是能够起作用，但是如果content_length大于实际数据长度的情况，还是多读取数据出来了

fawdlstty commented 2 years ago

需确认是否因远程服务器端ContentLength不对造成。如果是，那么代表非libfv问题，将不考虑兼容这种不标准的报文

sudavida commented 2 years ago

999%的情况是对的，偶尔一次实际内容长度小于Content_Length数值

sudavida commented 2 years ago

如果按照Content_Length数值读数据，就会跨到了下一个报文。这个是连续大量读数据的极端情况下发生的：一个报文接着一个报文。我只能试着避免这种情况，对报文进行适当检查，补救。

sudavida commented 2 years ago

好在正常报文中间不会出现类似“HTTP/**** 这种

sudavida commented 2 years ago

好像没有几个像我这样做连续的大数据量访问，但确实是我的真实使用情况

fawdlstty commented 2 years ago

改为这样试试

fv::Request::SetDefaultHeader ("Accept-Encoding", "gzip");
sudavida commented 2 years ago

后面我单独试下这个，目前是没用这个。当时是出现乱码的原因，猜测是编码问题，所以取消掉了。

sudavida commented 2 years ago

这个错误在gzip模式下出现： terminate called after throwing an instance of 'std::system_error' what(): cancel: Bad file descriptor

sudavida commented 2 years ago

感觉是socket连接断了，但是报的错和普通模式不一样，普通模式会报：End of file之类

sudavida commented 2 years ago

也可能是压缩数据格式错误

sudavida commented 2 years ago

实际检查发现出现报错：catch error: internal error (SSL routines, ssl3_read_n) wrong version number (SSL routines, SSL3_GET_RECORD) 改了这里： struct SslConn: public IConn { Tcp::resolver ResolverImpl; //Ssl::context SslCtx { Ssl::context::tls }; Ssl::context SslCtx { Ssl::context::context::sslv23 };//改

sudavida commented 2 years ago

改成gzip，chunked模式后还没遇到解析错误的情况

sudavida commented 2 years ago

还是有结束标志比较好解析

sudavida commented 2 years ago

跑出乱码： first line:����{u�F��U���H�$ثc:"оw��]yu]bu��O�jf<ɄKv�:<�.�VO�(-���Y�O�]�L�d�TPO]�ՂH�$�^�EM�H0FM@��d5�$�Aؙ�zui��_ߏ�`���zϺZ�Z,����I|�DKW�Od>�Q$X�i��f�h�y��Q$fħ�+m8^3�(&��xo�;���S�nGuu�򻕟OE��hɣm��-�����$V�ht�S7�R�9D�)���M죬'4"E�%��HZE7d�"d��→4Eb%���A��E◆]G�▒I�£:۹�)����▮��8W�─�┌/├☃F4�DK→

sudavida commented 2 years ago

读http协议第一行就报错，还没进入gzip解压。导致后面跟随5-6个报文都是乱码。再后面逐渐恢复正常

sudavida commented 2 years ago

这个比不使用chunked模式强，原来这种情况基本上恢复不了

sudavida commented 2 years ago

也可能是linux终端缓存的问题，我用的tmux

sudavida commented 2 years ago

乱码的原因可能是：编译覆盖了正在运行的程序

sudavida commented 2 years ago

另chuncked size： try { _sz = std::stoi(_sz_str, 0, 16); }catch(...){ throw Exception ("Unrecognized chunked size"); }

sudavida commented 2 years ago

gzip chunked模式偶尔也会乱码。但是稳定性要强很多，能够从错误流中恢复

sudavida commented 2 years ago 
   //解析错误在这里会被捕获，通过重连来解决
    fv::Response _r;
    try{
        if (!session.IsConnect()) {  
            session = co_await fv::Session::FromUrl(host, "");
        }
        _r = co_await session.Get (host+ uri);
    } catch (std::exception& e) {
        std::cout<<"error:"<<e.what()<<"\n";
        session.Conn->Reconnect();
    }
sudavida commented 2 years ago

乱码可能是不可避免的，这么解决可以接受

fawdlstty commented 2 years ago

最好换一些稳定的后台url试试，确认是否就是这个网站服务器的Content-Length问题