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<td valign="middle" style="color: #FFFFFF" nowrap="nowrap"><font size="6">Aedis 1.1.1</font>   <br> A redis client designed for performance and scalability </td>
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<li class="navelem"><a class="el" href="dir_d28a4824dc47e487b107a5db32ef43c4.html">examples</a></li> </ul>
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<div class="headertitle"><div class="title">echo_server.cpp</div></div>
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<div class="fragment"><div class="line"><a id="l00001" name="l00001"></a><span class="lineno"> 1</span><span class="comment">/* Copyright (c) 2018-2022 Marcelo Zimbres Silva (mzimbres@gmail.com)</span></div>
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<div class="line"><a id="l00002" name="l00002"></a><span class="lineno"> 2</span><span class="comment"> *</span></div>
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<div class="line"><a id="l00003" name="l00003"></a><span class="lineno"> 3</span><span class="comment"> * Distributed under the Boost Software License, Version 1.0. (See</span></div>
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<div class="line"><a id="l00004" name="l00004"></a><span class="lineno"> 4</span><span class="comment"> * accompanying file LICENSE.txt)</span></div>
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<div class="line"><a id="l00005" name="l00005"></a><span class="lineno"> 5</span><span class="comment"> */</span></div>
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<div class="line"><a id="l00006" name="l00006"></a><span class="lineno"> 6</span> </div>
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<div class="line"><a id="l00007" name="l00007"></a><span class="lineno"> 7</span><span class="preprocessor">#include <string></span></div>
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<div class="line"><a id="l00008" name="l00008"></a><span class="lineno"> 8</span><span class="preprocessor">#include <iostream></span></div>
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<div class="line"><a id="l00009" name="l00009"></a><span class="lineno"> 9</span> </div>
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<div class="line"><a id="l00010" name="l00010"></a><span class="lineno"> 10</span><span class="preprocessor">#include <boost/asio.hpp></span></div>
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<div class="line"><a id="l00011" name="l00011"></a><span class="lineno"> 11</span><span class="preprocessor">#if defined(BOOST_ASIO_HAS_CO_AWAIT)</span></div>
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<div class="line"><a id="l00012" name="l00012"></a><span class="lineno"> 12</span><span class="preprocessor">#include <aedis.hpp></span></div>
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<div class="line"><a id="l00013" name="l00013"></a><span class="lineno"> 13</span> </div>
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<div class="line"><a id="l00014" name="l00014"></a><span class="lineno"> 14</span><span class="comment">// Include this in no more than one .cpp file.</span></div>
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<div class="line"><a id="l00015" name="l00015"></a><span class="lineno"> 15</span><span class="preprocessor">#include <aedis/src.hpp></span></div>
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<div class="line"><a id="l00016" name="l00016"></a><span class="lineno"> 16</span> </div>
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<div class="line"><a id="l00017" name="l00017"></a><span class="lineno"> 17</span><span class="keyword">namespace </span>net = boost::asio;</div>
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<div class="line"><a id="l00018" name="l00018"></a><span class="lineno"> 18</span><span class="keyword">using </span><a class="code hl_function" href="group__high-level-api.html#gac56bb1a8df93445853a4b9dae2d97b6e">aedis::adapt</a>;</div>
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<div class="line"><a id="l00019" name="l00019"></a><span class="lineno"> 19</span><span class="keyword">using </span><a class="code hl_class" href="classaedis_1_1resp3_1_1request.html">aedis::resp3::request</a>;</div>
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<div class="line"><a id="l00020" name="l00020"></a><span class="lineno"> 20</span><span class="keyword">using </span><a class="code hl_struct" href="group__high-level-api.html#structaedis_1_1endpoint">aedis::endpoint</a>;</div>
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<div class="line"><a id="l00021" name="l00021"></a><span class="lineno"> 21</span><span class="keyword">using </span>executor_type = net::io_context::executor_type;</div>
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<div class="line"><a id="l00022" name="l00022"></a><span class="lineno"> 22</span><span class="keyword">using </span>socket_type = net::basic_stream_socket<net::ip::tcp, executor_type>;</div>
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<div class="line"><a id="l00023" name="l00023"></a><span class="lineno"> 23</span><span class="keyword">using </span>tcp_socket = net::use_awaitable_t<executor_type>::as_default_on_t<socket_type>;</div>
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<div class="line"><a id="l00024" name="l00024"></a><span class="lineno"> 24</span><span class="keyword">using </span>acceptor_type = net::basic_socket_acceptor<net::ip::tcp, executor_type>;</div>
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<div class="line"><a id="l00025" name="l00025"></a><span class="lineno"> 25</span><span class="keyword">using </span>tcp_acceptor = net::use_awaitable_t<executor_type>::as_default_on_t<acceptor_type>;</div>
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<div class="line"><a id="l00026" name="l00026"></a><span class="lineno"> 26</span><span class="keyword">using </span>awaitable_type = net::awaitable<void, executor_type>;</div>
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<div class="line"><a id="l00027" name="l00027"></a><span class="lineno"> 27</span><span class="keyword">using </span><a class="code hl_class" href="classaedis_1_1connection.html">connection</a> = <a class="code hl_class" href="classaedis_1_1connection.html">aedis::connection<tcp_socket></a>;</div>
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<div class="line"><a id="l00028" name="l00028"></a><span class="lineno"> 28</span> </div>
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<div class="line"><a id="l00029" name="l00029"></a><span class="lineno"> 29</span>awaitable_type echo_loop(tcp_socket socket, std::shared_ptr<connection> db)</div>
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<div class="line"><a id="l00030" name="l00030"></a><span class="lineno"> 30</span>{</div>
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<div class="line"><a id="l00031" name="l00031"></a><span class="lineno"> 31</span> request req;</div>
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<div class="line"><a id="l00032" name="l00032"></a><span class="lineno"> 32</span> std::tuple<std::string> resp;</div>
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<div class="line"><a id="l00033" name="l00033"></a><span class="lineno"> 33</span> </div>
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<div class="line"><a id="l00034" name="l00034"></a><span class="lineno"> 34</span> <span class="keywordflow">for</span> (std::string buffer;;) {</div>
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<div class="line"><a id="l00035" name="l00035"></a><span class="lineno"> 35</span> <span class="keyword">auto</span> n = <span class="keyword">co_await</span> net::async_read_until(socket, net::dynamic_buffer(buffer, 1024), <span class="stringliteral">"\n"</span>);</div>
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<div class="line"><a id="l00036" name="l00036"></a><span class="lineno"> 36</span> req.push(<span class="stringliteral">"PING"</span>, buffer);</div>
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<div class="line"><a id="l00037" name="l00037"></a><span class="lineno"> 37</span> <span class="keyword">co_await</span> db->async_exec(req, <a class="code hl_function" href="group__high-level-api.html#gac56bb1a8df93445853a4b9dae2d97b6e">adapt</a>(resp));</div>
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<div class="line"><a id="l00038" name="l00038"></a><span class="lineno"> 38</span> <span class="keyword">co_await</span> <a class="code hl_function" href="group__low-level-api.html#ga54dda2974f233dd25a2eaf20ce9b5385">net::async_write</a>(socket, net::buffer(std::get<0>(resp)));</div>
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<div class="line"><a id="l00039" name="l00039"></a><span class="lineno"> 39</span> std::get<0>(resp).clear();</div>
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<div class="line"><a id="l00040" name="l00040"></a><span class="lineno"> 40</span> req.clear();</div>
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<div class="line"><a id="l00041" name="l00041"></a><span class="lineno"> 41</span> buffer.erase(0, n);</div>
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<div class="line"><a id="l00042" name="l00042"></a><span class="lineno"> 42</span> }</div>
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<div class="line"><a id="l00043" name="l00043"></a><span class="lineno"> 43</span>}</div>
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<div class="line"><a id="l00044" name="l00044"></a><span class="lineno"> 44</span> </div>
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<div class="line"><a id="l00045" name="l00045"></a><span class="lineno"> 45</span>awaitable_type listener(std::shared_ptr<connection> db)</div>
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<div class="line"><a id="l00046" name="l00046"></a><span class="lineno"> 46</span>{</div>
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<div class="line"><a id="l00047" name="l00047"></a><span class="lineno"> 47</span> <span class="keyword">auto</span> ex = <span class="keyword">co_await</span> net::this_coro::executor;</div>
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<div class="line"><a id="l00048" name="l00048"></a><span class="lineno"> 48</span> tcp_acceptor acc(ex, {net::ip::tcp::v4(), 55555});</div>
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<div class="line"><a id="l00049" name="l00049"></a><span class="lineno"> 49</span> <span class="keywordflow">for</span> (;;)</div>
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<div class="line"><a id="l00050" name="l00050"></a><span class="lineno"> 50</span> net::co_spawn(ex, echo_loop(<span class="keyword">co_await</span> acc.async_accept(), db), net::detached);</div>
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<div class="line"><a id="l00051" name="l00051"></a><span class="lineno"> 51</span>}</div>
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<div class="line"><a id="l00052" name="l00052"></a><span class="lineno"> 52</span> </div>
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<div class="line"><a id="l00053" name="l00053"></a><span class="lineno"> 53</span><span class="keyword">auto</span> main() -> <span class="keywordtype">int</span></div>
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<div class="line"><a id="l00054" name="l00054"></a><span class="lineno"> 54</span>{</div>
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<div class="line"><a id="l00055" name="l00055"></a><span class="lineno"> 55</span> <span class="keywordflow">try</span> {</div>
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<div class="line"><a id="l00056" name="l00056"></a><span class="lineno"> 56</span> net::io_context ioc{BOOST_ASIO_CONCURRENCY_HINT_UNSAFE_IO};</div>
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<div class="line"><a id="l00057" name="l00057"></a><span class="lineno"> 57</span> <span class="keyword">auto</span> db = std::make_shared<connection>(ioc);</div>
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<div class="line"><a id="l00058" name="l00058"></a><span class="lineno"> 58</span> endpoint ep{<span class="stringliteral">"127.0.0.1"</span>, <span class="stringliteral">"6379"</span>};</div>
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<div class="line"><a id="l00059" name="l00059"></a><span class="lineno"> 59</span> db->async_run(ep, {}, [&](<span class="keyword">auto</span> <span class="keyword">const</span>& ec) {</div>
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<div class="line"><a id="l00060" name="l00060"></a><span class="lineno"> 60</span> std::clog << ec.message() << std::endl;</div>
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<div class="line"><a id="l00061" name="l00061"></a><span class="lineno"> 61</span> ioc.stop();</div>
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<div class="line"><a id="l00062" name="l00062"></a><span class="lineno"> 62</span> });</div>
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<div class="line"><a id="l00063" name="l00063"></a><span class="lineno"> 63</span> </div>
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<div class="line"><a id="l00064" name="l00064"></a><span class="lineno"> 64</span> net::signal_set signals(ioc, SIGINT, SIGTERM);</div>
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<div class="line"><a id="l00065" name="l00065"></a><span class="lineno"> 65</span> signals.async_wait([&](<span class="keyword">auto</span>, <span class="keyword">auto</span>){ ioc.stop(); });</div>
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<div class="line"><a id="l00066" name="l00066"></a><span class="lineno"> 66</span> </div>
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<div class="line"><a id="l00067" name="l00067"></a><span class="lineno"> 67</span> co_spawn(ioc, listener(db), net::detached);</div>
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<div class="line"><a id="l00068" name="l00068"></a><span class="lineno"> 68</span> ioc.run();</div>
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<div class="line"><a id="l00069" name="l00069"></a><span class="lineno"> 69</span> } <span class="keywordflow">catch</span> (std::exception <span class="keyword">const</span>& e) {</div>
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<div class="line"><a id="l00070" name="l00070"></a><span class="lineno"> 70</span> std::cerr << e.what() << std::endl;</div>
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<div class="line"><a id="l00071" name="l00071"></a><span class="lineno"> 71</span> }</div>
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<div class="line"><a id="l00072" name="l00072"></a><span class="lineno"> 72</span>}</div>
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<div class="line"><a id="l00073" name="l00073"></a><span class="lineno"> 73</span> </div>
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<div class="line"><a id="l00074" name="l00074"></a><span class="lineno"> 74</span><span class="preprocessor">#else </span><span class="comment">// defined(BOOST_ASIO_HAS_CO_AWAIT)</span></div>
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<div class="line"><a id="l00075" name="l00075"></a><span class="lineno"> 75</span><span class="keyword">auto</span> main() -> <span class="keywordtype">int</span> {std::cout << <span class="stringliteral">"Requires coroutine support."</span> << std::endl; <span class="keywordflow">return</span> 1;}</div>
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<div class="line"><a id="l00076" name="l00076"></a><span class="lineno"> 76</span><span class="preprocessor">#endif </span><span class="comment">// defined(BOOST_ASIO_HAS_CO_AWAIT)</span></div>
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<div class="ttc" id="aclassaedis_1_1connection_html"><div class="ttname"><a href="classaedis_1_1connection.html">aedis::connection</a></div><div class="ttdoc">A connection to the Redis server.</div><div class="ttdef"><b>Definition:</b> <a href="connection_8hpp_source.html#l00033">connection.hpp:36</a></div></div>
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<div class="ttc" id="aclassaedis_1_1resp3_1_1request_html"><div class="ttname"><a href="classaedis_1_1resp3_1_1request.html">aedis::resp3::request</a></div><div class="ttdoc">Creates Redis requests.</div><div class="ttdef"><b>Definition:</b> <a href="request_8hpp_source.html#l00174">request.hpp:174</a></div></div>
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<div class="ttc" id="agroup__high-level-api_html_gac56bb1a8df93445853a4b9dae2d97b6e"><div class="ttname"><a href="group__high-level-api.html#gac56bb1a8df93445853a4b9dae2d97b6e">aedis::adapt</a></div><div class="ttdeci">auto adapt(std::size_t max_read_size=(std::numeric_limits< std::size_t >::max)()) noexcept</div><div class="ttdoc">Creates an adapter that ignores responses.</div><div class="ttdef"><b>Definition:</b> <a href="adapt_8hpp_source.html#l00199">adapt.hpp:199</a></div></div>
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<div class="ttc" id="agroup__high-level-api_html_structaedis_1_1endpoint"><div class="ttname"><a href="group__high-level-api.html#structaedis_1_1endpoint">aedis::endpoint</a></div><div class="ttdoc">A Redis endpoint.</div><div class="ttdef"><b>Definition:</b> <a href="endpoint_8hpp_source.html#l00017">endpoint.hpp:17</a></div></div>
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<div class="ttc" id="agroup__low-level-api_html_ga54dda2974f233dd25a2eaf20ce9b5385"><div class="ttname"><a href="group__low-level-api.html#ga54dda2974f233dd25a2eaf20ce9b5385">aedis::resp3::async_write</a></div><div class="ttdeci">auto async_write(AsyncWriteStream &stream, Request const &req, CompletionToken &&token=boost::asio::default_completion_token_t< typename AsyncWriteStream::executor_type >{})</div><div class="ttdoc">Writes a request asynchronously.</div><div class="ttdef"><b>Definition:</b> <a href="write_8hpp_source.html#l00046">write.hpp:46</a></div></div>
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