我正在开发用于客户端和服务器之间异步通信的boost websockets 。
现在我正在打印程序期间经过的时间boost::timer::auto_cpu_timer
。它以秒为单位显示经过的时间。
我的程序片段如下:
此函数将数据发送到 websocket:
void WebSocketSession::WriteSocket(beast::error_code ec) {
if (ec)
return fail(ec, "ssl_handshake");
cout << "Authorised" <<endl;
//Start the timer
BoostTimer.start();
// Send the Data message
ws_.async_write(net::buffer(DATAMSG),
bind(&WebSocketSession::ReadSocket, shared_from_this(), placeholders::_1,placeholders::_2));
}
此函数读取websocket 响应
void WebSocketSession::ReadSocket(beast::error_code ec, size_t bytes_transferred) {
boost::ignore_unused(bytes_transferred);
if (ec)
return fail(ec, "WriteSocket Failed");
cout << "Time Elapsed before reading WS : " << TimeElapsed() << endl;
try {
ws_.read(ReadBuffer_);
} catch (exception *e) {
cerr << "Error: " << e->what() << endl;
}
cout << "Time Elapsed after reading WS : " << TimeElapsed() << endl;
// Display the buffer into stringstream
cout << beast::buffers(ReadBuffer_.data());
// Clear the websocket buffer
ReadBuffer_.consume(ReadBuffer_.size());
cout << "Time Elapsed before moving ahead : " << TimeElapsed() << endl;
// Decision tree
// IsGstFileWriteDone() gives "true" when the file is written... that file is not related to this context. An event is pushed saying FILE_WRITE_DONE
if (mIbmWatsonobj->IsGstFileWriteDone()){
cout<< "Going to CloseSocket" << endl;
WebSocketSession::CloseSocket(ec, 0);
}else{
cout<< "Going to ReadSocket" << endl;
WebSocketSession::ReadSocket(ec, 0);
}
}
此函数关闭Web 套接字
void WebSocketSession::CloseSocket(beast::error_code ec, size_t bytes_transferred) {
boost::ignore_unused(bytes_transferred);
if (ec)
return fail(ec, "ReadSocket Failed");
cout << "CLOSING" <<endl;
// Close the WebSocket connection
ws_.close(websocket::close_code::normal);
}
这是我的程序输出的样子: 从 websocket 收到的响应显示为灰色(输出cout << beast::buffers(ReadBuffer_.data());
)其余是打印在程序中各个位置的 couts。经过的时间以秒为单位
读取 WS 之前经过的IBM 授权
时间:0
读取 WS 之后经过的时间:0.3{ "state": "listening" }
前进前经过的时间:0.3
转到 ReadSocket
阅读 WS 前经过的
时间:0.3 阅读 WS 后经过的时间:2.1{ "results": [ { "alternatives": [ { "confidence": 0.89, "transcript": "several tornadoes touch down as a line of severe some " } ], "final": true } ], "result_index": 0 }
前进前经过的时间:2.1
转到 ReadSocket
阅读 WS 前经过的
时间:2.1 阅读 WS 后经过的时间:2.1{ "state": "listening" }
前进前经过的时间:2.1
转到 ReadSocket
阅读 WS 前经过的时间:2.1事件推送:FILE_WRITE_DONE
阅读 WS 后经过的时间:34
{ "error": "Session timed out." }
前进前经过的时间:34
//程序退出 -1
问题:
几秒钟后2.1
,程序再次进入 ReadSocket,在该处ws_.read(ReadBuffer_);
阻塞执行近 32 秒,直到它从套接字接收到某些东西,在这种情况下,它接收到“会话超时”。
当这个块打开 5 秒时,我怎样才能移动到 CloseSocket。也就是说,如果在任何时候我ws_.read
阻止我的代码超过 5 秒,我想把我的行为说出来,比如 CloseSocket。