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<title>Daytime.7 - A combined TCP/UDP asynchronous server</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 class="section">
<div class="titlepage"><div><div><h3 class="title">
<a name="asio.tutorial.tutdaytime7"></a><a class="link" href="tutdaytime7.html" title="Daytime.7 - A combined TCP/UDP asynchronous server">Daytime.7 - A combined TCP/UDP
asynchronous server</a>
</h3></div></div></div>
<p>
This tutorial program shows how to combine the two asynchronous servers that
we have just written, into a single server application.
</p>
<h5>
<a name="asio.tutorial.tutdaytime7.h0"></a>
<span><a name="asio.tutorial.tutdaytime7.the_main___function"></a></span><a class="link" href="tutdaytime7.html#asio.tutorial.tutdaytime7.the_main___function">The
main() function</a>
</h5>
<pre class="programlisting"><span class="keyword">int</span> <span class="identifier">main</span><span class="special">()</span>
<span class="special">{</span>
<span class="keyword">try</span>
<span class="special">{</span>
<span class="identifier">asio</span><span class="special">::</span><span class="identifier">io_context</span> <span class="identifier">io_context</span><span class="special">;</span>
</pre>
<p>
We will begin by creating a server object to accept a TCP client connection.
</p>
<pre class="programlisting"> <span class="identifier">tcp_server</span> <span class="identifier">server1</span><span class="special">(</span><span class="identifier">io_context</span><span class="special">);</span>
</pre>
<p>
We also need a server object to accept a UDP client request.
</p>
<pre class="programlisting"> <span class="identifier">udp_server</span> <span class="identifier">server2</span><span class="special">(</span><span class="identifier">io_context</span><span class="special">);</span>
</pre>
<p>
We have created two lots of work for the <a class="link" href="../reference/io_context.html" title="io_context">io_context</a>
object to do.
</p>
<pre class="programlisting"> <span class="identifier">io_context</span><span class="special">.</span><span class="identifier">run</span><span class="special">();</span>
<span class="special">}</span>
<span class="keyword">catch</span> <span class="special">(</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">exception</span><span class="special">&amp;</span> <span class="identifier">e</span><span class="special">)</span>
<span class="special">{</span>
<span class="identifier">std</span><span class="special">::</span><span class="identifier">cerr</span> <span class="special">&lt;&lt;</span> <span class="identifier">e</span><span class="special">.</span><span class="identifier">what</span><span class="special">()</span> <span class="special">&lt;&lt;</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">endl</span><span class="special">;</span>
<span class="special">}</span>
<span class="keyword">return</span> <span class="number">0</span><span class="special">;</span>
<span class="special">}</span>
</pre>
<h5>
<a name="asio.tutorial.tutdaytime7.h1"></a>
<span><a name="asio.tutorial.tutdaytime7.the_tcp_connection_and_tcp_server_classes"></a></span><a class="link" href="tutdaytime7.html#asio.tutorial.tutdaytime7.the_tcp_connection_and_tcp_server_classes">The
tcp_connection and tcp_server classes</a>
</h5>
<p>
The following two classes are taken from <a class="link" href="tutdaytime3.html" title="Daytime.3 - An asynchronous TCP daytime server">Daytime.3</a>.
</p>
<pre class="programlisting"><span class="keyword">class</span> <span class="identifier">tcp_connection</span>
<span class="special">:</span> <span class="keyword">public</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">enable_shared_from_this</span><span class="special">&lt;</span><span class="identifier">tcp_connection</span><span class="special">&gt;</span>
<span class="special">{</span>
<span class="keyword">public</span><span class="special">:</span>
<span class="keyword">typedef</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">shared_ptr</span><span class="special">&lt;</span><span class="identifier">tcp_connection</span><span class="special">&gt;</span> <span class="identifier">pointer</span><span class="special">;</span>
<span class="keyword">static</span> <span class="identifier">pointer</span> <span class="identifier">create</span><span class="special">(</span><span class="identifier">asio</span><span class="special">::</span><span class="identifier">io_context</span><span class="special">&amp;</span> <span class="identifier">io_context</span><span class="special">)</span>
<span class="special">{</span>
<span class="keyword">return</span> <span class="identifier">pointer</span><span class="special">(</span><span class="keyword">new</span> <span class="identifier">tcp_connection</span><span class="special">(</span><span class="identifier">io_context</span><span class="special">));</span>
<span class="special">}</span>
<span class="identifier">tcp</span><span class="special">::</span><span class="identifier">socket</span><span class="special">&amp;</span> <span class="identifier">socket</span><span class="special">()</span>
<span class="special">{</span>
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<span class="keyword">return</span> <span class="identifier">local_socket</span><span class="special">;</span>
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<span class="special">}</span>
<span class="keyword">void</span> <span class="identifier">start</span><span class="special">()</span>
<span class="special">{</span>
<span class="identifier">message_</span> <span class="special">=</span> <span class="identifier">make_daytime_string</span><span class="special">();</span>
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<span class="identifier">asio</span><span class="special">::</span><span class="identifier">async_write</span><span class="special">(</span><span class="identifier">local_socket</span><span class="special">,</span> <span class="identifier">asio</span><span class="special">::</span><span class="identifier">buffer</span><span class="special">(</span><span class="identifier">message_</span><span class="special">),</span>
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<span class="identifier">boost</span><span class="special">::</span><span class="identifier">bind</span><span class="special">(&amp;</span><span class="identifier">tcp_connection</span><span class="special">::</span><span class="identifier">handle_write</span><span class="special">,</span> <span class="identifier">shared_from_this</span><span class="special">()));</span>
<span class="special">}</span>
<span class="keyword">private</span><span class="special">:</span>
<span class="identifier">tcp_connection</span><span class="special">(</span><span class="identifier">asio</span><span class="special">::</span><span class="identifier">io_context</span><span class="special">&amp;</span> <span class="identifier">io_context</span><span class="special">)</span>
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<span class="special">:</span> <span class="identifier">local_socket</span><span class="special">(</span><span class="identifier">io_context</span><span class="special">)</span>
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<span class="special">{</span>
<span class="special">}</span>
<span class="keyword">void</span> <span class="identifier">handle_write</span><span class="special">()</span>
<span class="special">{</span>
<span class="special">}</span>
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<span class="identifier">tcp</span><span class="special">::</span><span class="identifier">socket</span> <span class="identifier">local_socket</span><span class="special">;</span>
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<span class="identifier">std</span><span class="special">::</span><span class="identifier">string</span> <span class="identifier">message_</span><span class="special">;</span>
<span class="special">};</span>
<span class="keyword">class</span> <span class="identifier">tcp_server</span>
<span class="special">{</span>
<span class="keyword">public</span><span class="special">:</span>
<span class="identifier">tcp_server</span><span class="special">(</span><span class="identifier">asio</span><span class="special">::</span><span class="identifier">io_context</span><span class="special">&amp;</span> <span class="identifier">io_context</span><span class="special">)</span>
<span class="special">:</span> <span class="identifier">io_context_</span><span class="special">(</span><span class="identifier">io_context</span><span class="special">),</span>
<span class="identifier">acceptor_</span><span class="special">(</span><span class="identifier">io_context</span><span class="special">,</span> <span class="identifier">tcp</span><span class="special">::</span><span class="identifier">endpoint</span><span class="special">(</span><span class="identifier">tcp</span><span class="special">::</span><span class="identifier">v4</span><span class="special">(),</span> <span class="number">13</span><span class="special">))</span>
<span class="special">{</span>
<span class="identifier">start_accept</span><span class="special">();</span>
<span class="special">}</span>
<span class="keyword">private</span><span class="special">:</span>
<span class="keyword">void</span> <span class="identifier">start_accept</span><span class="special">()</span>
<span class="special">{</span>
<span class="identifier">tcp_connection</span><span class="special">::</span><span class="identifier">pointer</span> <span class="identifier">new_connection</span> <span class="special">=</span>
<span class="identifier">tcp_connection</span><span class="special">::</span><span class="identifier">create</span><span class="special">(</span><span class="identifier">io_context_</span><span class="special">);</span>
<span class="identifier">acceptor_</span><span class="special">.</span><span class="identifier">async_accept</span><span class="special">(</span><span class="identifier">new_connection</span><span class="special">-&gt;</span><span class="identifier">socket</span><span class="special">(),</span>
<span class="identifier">boost</span><span class="special">::</span><span class="identifier">bind</span><span class="special">(&amp;</span><span class="identifier">tcp_server</span><span class="special">::</span><span class="identifier">handle_accept</span><span class="special">,</span> <span class="keyword">this</span><span class="special">,</span> <span class="identifier">new_connection</span><span class="special">,</span>
<span class="identifier">asio</span><span class="special">::</span><span class="identifier">placeholders</span><span class="special">::</span><span class="identifier">error</span><span class="special">));</span>
<span class="special">}</span>
<span class="keyword">void</span> <span class="identifier">handle_accept</span><span class="special">(</span><span class="identifier">tcp_connection</span><span class="special">::</span><span class="identifier">pointer</span> <span class="identifier">new_connection</span><span class="special">,</span>
<span class="keyword">const</span> <span class="identifier">asio</span><span class="special">::</span><span class="identifier">error_code</span><span class="special">&amp;</span> <span class="identifier">error</span><span class="special">)</span>
<span class="special">{</span>
<span class="keyword">if</span> <span class="special">(!</span><span class="identifier">error</span><span class="special">)</span>
<span class="special">{</span>
<span class="identifier">new_connection</span><span class="special">-&gt;</span><span class="identifier">start</span><span class="special">();</span>
<span class="special">}</span>
<span class="identifier">start_accept</span><span class="special">();</span>
<span class="special">}</span>
<span class="identifier">asio</span><span class="special">::</span><span class="identifier">io_context</span><span class="special">&amp;</span> <span class="identifier">io_context_</span><span class="special">;</span>
<span class="identifier">tcp</span><span class="special">::</span><span class="identifier">acceptor</span> <span class="identifier">acceptor_</span><span class="special">;</span>
<span class="special">};</span>
</pre>
<h5>
<a name="asio.tutorial.tutdaytime7.h2"></a>
<span><a name="asio.tutorial.tutdaytime7.the_udp_server_class"></a></span><a class="link" href="tutdaytime7.html#asio.tutorial.tutdaytime7.the_udp_server_class">The
udp_server class</a>
</h5>
<p>
Similarly, this next class is taken from the <a class="link" href="tutdaytime6.html" title="Daytime.6 - An asynchronous UDP daytime server">previous
tutorial step</a>.
</p>
<pre class="programlisting"><span class="keyword">class</span> <span class="identifier">udp_server</span>
<span class="special">{</span>
<span class="keyword">public</span><span class="special">:</span>
<span class="identifier">udp_server</span><span class="special">(</span><span class="identifier">asio</span><span class="special">::</span><span class="identifier">io_context</span><span class="special">&amp;</span> <span class="identifier">io_context</span><span class="special">)</span>
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<span class="special">:</span> <span class="identifier">local_socket</span><span class="special">(</span><span class="identifier">io_context</span><span class="special">,</span> <span class="identifier">udp</span><span class="special">::</span><span class="identifier">endpoint</span><span class="special">(</span><span class="identifier">udp</span><span class="special">::</span><span class="identifier">v4</span><span class="special">(),</span> <span class="number">13</span><span class="special">))</span>
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<span class="special">{</span>
<span class="identifier">start_receive</span><span class="special">();</span>
<span class="special">}</span>
<span class="keyword">private</span><span class="special">:</span>
<span class="keyword">void</span> <span class="identifier">start_receive</span><span class="special">()</span>
<span class="special">{</span>
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<span class="identifier">local_socket</span><span class="special">.</span><span class="identifier">async_receive_from</span><span class="special">(</span>
<span class="identifier">asio</span><span class="special">::</span><span class="identifier">buffer</span><span class="special">(</span><span class="identifier">recv_buffer_</span><span class="special">),</span> <span class="identifier">remote_connection</span><span class="special">,</span>
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<span class="identifier">boost</span><span class="special">::</span><span class="identifier">bind</span><span class="special">(&amp;</span><span class="identifier">udp_server</span><span class="special">::</span><span class="identifier">handle_receive</span><span class="special">,</span> <span class="keyword">this</span><span class="special">,</span>
<span class="identifier">asio</span><span class="special">::</span><span class="identifier">placeholders</span><span class="special">::</span><span class="identifier">error</span><span class="special">));</span>
<span class="special">}</span>
<span class="keyword">void</span> <span class="identifier">handle_receive</span><span class="special">(</span><span class="keyword">const</span> <span class="identifier">asio</span><span class="special">::</span><span class="identifier">error_code</span><span class="special">&amp;</span> <span class="identifier">error</span><span class="special">)</span>
<span class="special">{</span>
<span class="keyword">if</span> <span class="special">(!</span><span class="identifier">error</span><span class="special">)</span>
<span class="special">{</span>
<span class="identifier">boost</span><span class="special">::</span><span class="identifier">shared_ptr</span><span class="special">&lt;</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">string</span><span class="special">&gt;</span> <span class="identifier">message</span><span class="special">(</span>
<span class="keyword">new</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">string</span><span class="special">(</span><span class="identifier">make_daytime_string</span><span class="special">()));</span>
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<span class="identifier">local_socket</span><span class="special">.</span><span class="identifier">async_send_to</span><span class="special">(</span><span class="identifier">asio</span><span class="special">::</span><span class="identifier">buffer</span><span class="special">(*</span><span class="identifier">message</span><span class="special">),</span> <span class="identifier">remote_connection</span><span class="special">,</span>
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<span class="identifier">boost</span><span class="special">::</span><span class="identifier">bind</span><span class="special">(&amp;</span><span class="identifier">udp_server</span><span class="special">::</span><span class="identifier">handle_send</span><span class="special">,</span> <span class="keyword">this</span><span class="special">,</span> <span class="identifier">message</span><span class="special">));</span>
<span class="identifier">start_receive</span><span class="special">();</span>
<span class="special">}</span>
<span class="special">}</span>
<span class="keyword">void</span> <span class="identifier">handle_send</span><span class="special">(</span><span class="identifier">boost</span><span class="special">::</span><span class="identifier">shared_ptr</span><span class="special">&lt;</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">string</span><span class="special">&gt;</span> <span class="comment">/*message*/</span><span class="special">)</span>
<span class="special">{</span>
<span class="special">}</span>
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<span class="identifier">udp</span><span class="special">::</span><span class="identifier">socket</span> <span class="identifier">local_socket</span><span class="special">;</span>
<span class="identifier">udp</span><span class="special">::</span><span class="identifier">endpoint</span> <span class="identifier">remote_connection</span><span class="special">;</span>
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<span class="identifier">boost</span><span class="special">::</span><span class="identifier">array</span><span class="special">&lt;</span><span class="keyword">char</span><span class="special">,</span> <span class="number">1</span><span class="special">&gt;</span> <span class="identifier">recv_buffer_</span><span class="special">;</span>
<span class="special">};</span>
</pre>
<p>
See the <a class="link" href="tutdaytime7/src.html" title="Source listing for Daytime.7">full source listing</a>
</p>
<p>
Return to the <a class="link" href="../tutorial.html" title="Tutorial">tutorial index</a>
</p>
<p>
Previous: <a class="link" href="tutdaytime6.html" title="Daytime.6 - An asynchronous UDP daytime server">Daytime.6 - An asynchronous
UDP daytime server</a>
</p>
</div>
<div class="copyright-footer">Copyright © 2003-2023 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>
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