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mastodonpp/docs/example02_streaming_8cpp-example.html
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&#160;<span id="projectnumber">0.1.0</span>
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<div class="title">example02_streaming.cpp</div> </div>
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<div class="contents">
<div class="fragment"><div class="line"><span class="comment">/* This file is part of mastodonpp.</span></div>
<div class="line"><span class="comment"> * Copyright © 2020 tastytea &lt;tastytea@tastytea.de&gt;</span></div>
<div class="line"><span class="comment"> *</span></div>
<div class="line"><span class="comment"> * Permission to use, copy, modify, and/or distribute this software for any</span></div>
<div class="line"><span class="comment"> * purpose with or without fee is hereby granted.</span></div>
<div class="line"><span class="comment"> *</span></div>
<div class="line"><span class="comment"> * THE SOFTWARE IS PROVIDED &quot;AS IS&quot; AND THE AUTHOR DISCLAIMS ALL WARRANTIES</span></div>
<div class="line"><span class="comment"> * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF</span></div>
<div class="line"><span class="comment"> * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY</span></div>
<div class="line"><span class="comment"> * SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES</span></div>
<div class="line"><span class="comment"> * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION</span></div>
<div class="line"><span class="comment"> * OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN</span></div>
<div class="line"><span class="comment"> * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.</span></div>
<div class="line"><span class="comment"> */</span></div>
<div class="line"> </div>
<div class="line"><span class="comment">// Print new public events (/api/v1/streaming/public).</span></div>
<div class="line"> </div>
<div class="line"><span class="preprocessor">#include &quot;mastodonpp.hpp&quot;</span></div>
<div class="line"> </div>
<div class="line"><span class="preprocessor">#include &lt;chrono&gt;</span></div>
<div class="line"><span class="preprocessor">#include &lt;iostream&gt;</span></div>
<div class="line"><span class="preprocessor">#include &lt;string&gt;</span></div>
<div class="line"><span class="preprocessor">#include &lt;string_view&gt;</span></div>
<div class="line"><span class="preprocessor">#include &lt;thread&gt;</span></div>
<div class="line"><span class="preprocessor">#include &lt;vector&gt;</span></div>
<div class="line"> </div>
<div class="line"><span class="keyword">namespace </span>masto = <a class="code" href="namespacemastodonpp.html">mastodonpp</a>;</div>
<div class="line"><span class="keyword">using namespace </span>std::chrono_literals;</div>
<div class="line"><span class="keyword">using</span> std::cout;</div>
<div class="line"><span class="keyword">using</span> std::cerr;</div>
<div class="line"><span class="keyword">using</span> std::endl;</div>
<div class="line"><span class="keyword">using</span> std::to_string;</div>
<div class="line"><span class="keyword">using</span> std::string_view;</div>
<div class="line"><span class="keyword">using</span> std::thread;</div>
<div class="line"><span class="keyword">using</span> std::this_thread::sleep_for;</div>
<div class="line"><span class="keyword">using</span> std::vector;</div>
<div class="line"> </div>
<div class="line"><span class="keywordtype">int</span> main(<span class="keywordtype">int</span> argc, <span class="keywordtype">char</span> *argv[])</div>
<div class="line">{</div>
<div class="line"> <span class="keyword">const</span> vector&lt;string_view&gt; args(argv, argv + argc);</div>
<div class="line"> <span class="keywordflow">if</span> (args.size() &lt;= 1)</div>
<div class="line"> {</div>
<div class="line"> cerr &lt;&lt; <span class="stringliteral">&quot;Usage: &quot;</span> &lt;&lt; args[0] &lt;&lt; <span class="stringliteral">&quot; &lt;instance hostname&gt;\n&quot;</span>;</div>
<div class="line"> <span class="keywordflow">return</span> 1;</div>
<div class="line"> }</div>
<div class="line"> </div>
<div class="line"> <span class="keywordflow">try</span></div>
<div class="line"> {</div>
<div class="line"> <span class="comment">// Initialize an Instance.</span></div>
<div class="line"> masto::Instance instance{args[1], {}};</div>
<div class="line"> </div>
<div class="line"> <span class="comment">// Initialize a Connection.</span></div>
<div class="line"> masto::Connection connection{instance};</div>
<div class="line"> </div>
<div class="line"> <span class="comment">// Find out if the streaming service is fine.</span></div>
<div class="line"> <span class="keyword">auto</span> answer{connection.get(masto::API::v1::streaming_health)};</div>
<div class="line"> <span class="keywordflow">if</span> (answer &amp;&amp; answer.body == <span class="stringliteral">&quot;OK&quot;</span>)</div>
<div class="line"> {</div>
<div class="line"> <span class="comment">// Make a thread, get all public events.</span></div>
<div class="line"> thread stream_thread{[&amp;]</div>
<div class="line"> {</div>
<div class="line"> answer = connection.get(masto::API::v1::streaming_public);</div>
<div class="line"> }};</div>
<div class="line"> </div>
<div class="line"> <span class="comment">// Print new events every 2 seconds, for 10 seconds.</span></div>
<div class="line"> <span class="keywordflow">for</span> (<span class="keyword">auto</span> counter{0}; counter &lt; 5; ++counter)</div>
<div class="line"> {</div>
<div class="line"> sleep_for(2s);</div>
<div class="line"> <span class="keywordflow">for</span> (<span class="keyword">const</span> <span class="keyword">auto</span> &amp;event : connection.get_new_events())</div>
<div class="line"> {</div>
<div class="line"> <span class="comment">// Print type of event and the beginning of the data.</span></div>
<div class="line"> cout &lt;&lt; <span class="keyword">event</span>.type &lt;&lt; <span class="stringliteral">&quot;: &quot;</span></div>
<div class="line"> &lt;&lt; <span class="keyword">event</span>.data.substr(0, 70) &lt;&lt; <span class="stringliteral">&quot; …&quot;</span> &lt;&lt; endl;</div>
<div class="line"> }</div>
<div class="line"> }</div>
<div class="line"> </div>
<div class="line"> <span class="comment">// Cancel the stream, …</span></div>
<div class="line"> connection.cancel_stream();</div>
<div class="line"> <span class="comment">// … and wait for the thread.</span></div>
<div class="line"> stream_thread.join();</div>
<div class="line"> }</div>
<div class="line"> <span class="keywordflow">else</span></div>
<div class="line"> {</div>
<div class="line"> <span class="keywordflow">if</span> (answer.curl_error_code == 0)</div>
<div class="line"> {</div>
<div class="line"> <span class="comment">// If it is no libcurl error, it must be an HTTP error.</span></div>
<div class="line"> cerr &lt;&lt; <span class="stringliteral">&quot;HTTP status: &quot;</span> &lt;&lt; answer.http_status &lt;&lt; endl;</div>
<div class="line"> }</div>
<div class="line"> <span class="keywordflow">else</span></div>
<div class="line"> {</div>
<div class="line"> <span class="comment">// Network errors like “Couldn&#39;t resolve host.”.</span></div>
<div class="line"> cerr &lt;&lt; <span class="stringliteral">&quot;libcurl error &quot;</span> &lt;&lt; to_string(answer.curl_error_code)</div>
<div class="line"> &lt;&lt; <span class="stringliteral">&quot;: &quot;</span> &lt;&lt; answer.error_message &lt;&lt; endl;</div>
<div class="line"> }</div>
<div class="line"> }</div>
<div class="line"> }</div>
<div class="line"> <span class="keywordflow">catch</span> (<span class="keyword">const</span> masto::CURLException &amp;e)</div>
<div class="line"> {</div>
<div class="line"> <span class="comment">// Only libcurl errors that are not network errors will be thrown.</span></div>
<div class="line"> <span class="comment">// There went probably something wrong with the initialization.</span></div>
<div class="line"> cerr &lt;&lt; e.what() &lt;&lt; endl;</div>
<div class="line"> }</div>
<div class="line"> </div>
<div class="line"> <span class="keywordflow">return</span> 0;</div>
<div class="line">}</div>
</div><!-- fragment --> </div><!-- contents -->
<div class="ttc" id="anamespacemastodonpp_html"><div class="ttname"><a href="namespacemastodonpp.html">mastodonpp</a></div><div class="ttdoc">C++ wrapper for the Mastodon API.</div><div class="ttdef"><b>Definition:</b> answer.cpp:22</div></div>
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