Adds asio library and Storage Module

2020-12-01 22:41:04 +01:00
1 parent 79a6ee5779
commit 30439acd43
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+<html>
+<head>
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+<title>Source listing for Daytime.3</title>
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+<table cellpadding="2" width="100%"><tr><td valign="top"><img alt="asio C++ library" width="250" height="60" src="../../../asio.png"></td></tr></table>
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+</div>
+<div class="section">
+<div class="titlepage"><div><div><h4 class="title">
+<a name="asio.tutorial.tutdaytime3.src"></a><a class="link" href="src.html" title="Source listing for Daytime.3">Source listing for Daytime.3</a>
+</h4></div></div></div>
+<pre class="programlisting">//
+// server.cpp
+// ~~~~~~~~~~
+//
+// Copyright (c) 2003-2020 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+
+#include &lt;ctime&gt;
+#include &lt;iostream&gt;
+#include &lt;string&gt;
+#include &lt;boost/bind/bind.hpp&gt;
+#include &lt;boost/shared_ptr.hpp&gt;
+#include &lt;boost/enable_shared_from_this.hpp&gt;
+#include &lt;asio.hpp&gt;
+
+using asio::ip::tcp;
+
+std::string make_daytime_string()
+{
+  using namespace std; // For time_t, time and ctime;
+  time_t now = time(0);
+  return ctime(&amp;now);
+}
+
+class tcp_connection
+  : public boost::enable_shared_from_this&lt;tcp_connection&gt;
+{
+public:
+  typedef boost::shared_ptr&lt;tcp_connection&gt; pointer;
+
+  static pointer create(asio::io_context&amp; io_context)
+  {
+    return pointer(new tcp_connection(io_context));
+  }
+
+  tcp::socket&amp; socket()
+  {
+    return socket_;
+  }
+
+  void start()
+  {
+    message_ = make_daytime_string();
+
+    asio::async_write(socket_, asio::buffer(message_),
+        boost::bind(&amp;tcp_connection::handle_write, shared_from_this(),
+          asio::placeholders::error,
+          asio::placeholders::bytes_transferred));
+  }
+
+private:
+  tcp_connection(asio::io_context&amp; io_context)
+    : socket_(io_context)
+  {
+  }
+
+  void handle_write(const asio::error_code&amp; /*error*/,
+      size_t /*bytes_transferred*/)
+  {
+  }
+
+  tcp::socket socket_;
+  std::string message_;
+};
+
+class tcp_server
+{
+public:
+  tcp_server(asio::io_context&amp; io_context)
+    : io_context_(io_context),
+      acceptor_(io_context, tcp::endpoint(tcp::v4(), 13))
+  {
+    start_accept();
+  }
+
+private:
+  void start_accept()
+  {
+    tcp_connection::pointer new_connection =
+      tcp_connection::create(io_context_);
+
+    acceptor_.async_accept(new_connection-&gt;socket(),
+        boost::bind(&amp;tcp_server::handle_accept, this, new_connection,
+          asio::placeholders::error));
+  }
+
+  void handle_accept(tcp_connection::pointer new_connection,
+      const asio::error_code&amp; error)
+  {
+    if (!error)
+    {
+      new_connection-&gt;start();
+    }
+
+    start_accept();
+  }
+
+  asio::io_context&amp; io_context_;
+  tcp::acceptor acceptor_;
+};
+
+int main()
+{
+  try
+  {
+    asio::io_context io_context;
+    tcp_server server(io_context);
+    io_context.run();
+  }
+  catch (std::exception&amp; e)
+  {
+    std::cerr &lt;&lt; e.what() &lt;&lt; std::endl;
+  }
+
+  return 0;
+}
+</pre>
+<p>
+          Return to <a class="link" href="../tutdaytime3.html" title="Daytime.3 - An asynchronous TCP daytime server">Daytime.3 - An asynchronous
+          TCP daytime server</a>
+        </p>
+</div>
+<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
+<td align="left"></td>
+<td align="right"><div class="copyright-footer">Copyright © 2003-2020 Christopher M.
+      Kohlhoff<p>
+        Distributed under the Boost Software License, Version 1.0. (See accompanying
+        file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)
+      </p>
+</div></td>
+</tr></table>
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