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<div id="projectname">mastodon-cpp
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 <span id="projectnumber">0.110.0</span>
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<div class="title">example02_stream.cpp</div> </div>
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<div class="fragment"><div class="line"><span class="comment">// This file is part of mastodon-cpp.</span></div><div class="line"><span class="comment">// Listen to /api/v1/streaming/public and display the events.</span></div><div class="line"></div><div class="line"><span class="comment">// Don't compile this if the Easy-interface is turned off</span></div><div class="line"><span class="preprocessor">#ifndef WITHOUT_EASY</span></div><div class="line"></div><div class="line"><span class="preprocessor">#include <iostream></span></div><div class="line"><span class="preprocessor">#include <string></span></div><div class="line"><span class="preprocessor">#include <cstdint></span></div><div class="line"><span class="preprocessor">#include <mutex></span></div><div class="line"><span class="preprocessor">#include <chrono></span></div><div class="line"><span class="preprocessor">#include <vector></span></div><div class="line"><span class="preprocessor">#include "mastodon-cpp.hpp"</span></div><div class="line"><span class="preprocessor">#include "easy/all.hpp"</span></div><div class="line"></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::string;</div><div class="line"><span class="keyword">using</span> std::uint8_t;</div><div class="line"><span class="keyword">using namespace </span><a class="code" href="namespaceMastodon.html">Mastodon</a>;</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="keywordflow">if</span> (argc < 2)</div><div class="line"> {</div><div class="line"> std::cerr << <span class="stringliteral">"usage: "</span> << argv[0] << <span class="stringliteral">" <instance>\n"</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="comment">// Construct a Mastodon::Easy object without authorization token.</span></div><div class="line"> <a name="_a0"></a><a class="code" href="classMastodon_1_1Easy_1_1API.html">Easy::API</a> masto(argv[1], <span class="stringliteral">""</span>);</div><div class="line"> <span class="comment">// Prepare a pointer to the http object, to cancel the stream later.</span></div><div class="line"> std::unique_ptr<API::http> ptr;</div><div class="line"> <span class="comment">// This variable is filled with the stream data.</span></div><div class="line"> <span class="keywordtype">string</span> stream;</div><div class="line"></div><div class="line"> <span class="comment">// Get the public timeline. The pointer is set here.</span></div><div class="line"> masto.<a name="a1"></a><a class="code" href="classMastodon_1_1API.html#a699e4557aef3419b05c4231d0b65388b">get_stream</a>(API::v1::streaming_public, ptr, stream);</div><div class="line"></div><div class="line"> <span class="comment">// Listen to the stream for 120 seconds.</span></div><div class="line"> <span class="keywordflow">for</span> (uint8_t counter = 0; counter < 120; ++counter)</div><div class="line"> {</div><div class="line"> std::this_thread::sleep_for(std::chrono::seconds(1));</div><div class="line"></div><div class="line"> <span class="comment">// Acquire lock for the stream variable to avoid simultaneous access.</span></div><div class="line"> std::lock_guard<std::mutex> lock(ptr->get_mutex());</div><div class="line"> <span class="comment">// Parse event stream into a vector.</span></div><div class="line"> std::vector<Easy::stream_event_type> events</div><div class="line"> = <a name="a2"></a><a class="code" href="namespaceMastodon_1_1Easy.html#a6bc390f957819b961770947c90f4f99b">Easy::parse_stream</a>(stream);</div><div class="line"> <span class="comment">// Clear the stream buffer.</span></div><div class="line"> stream.clear();</div><div class="line"></div><div class="line"> <span class="keywordflow">for</span> (<span class="keyword">const</span> <a name="_a3"></a><a class="code" href="structMastodon_1_1Easy_1_1stream__event__type.html">Easy::stream_event_type</a> &event : events)</div><div class="line"> {</div><div class="line"> <span class="comment">// Print out some information about the events.</span></div><div class="line"> <span class="keywordflow">switch</span> (event.type)</div><div class="line"> {</div><div class="line"> <span class="keywordflow">case</span> Easy::event_type::Update:</div><div class="line"> {</div><div class="line"> <a name="_a4"></a><a class="code" href="classMastodon_1_1Easy_1_1Status.html">Easy::Status</a> status(event.data);</div><div class="line"> cout << <span class="stringliteral">"["</span> << status.<a name="a5"></a><a class="code" href="classMastodon_1_1Easy_1_1Status.html#a5670b8aece1f3774e760482f3cd0ea71">created_at</a>().<a name="a6"></a><a class="code" href="structMastodon_1_1Easy_1_1time__type.html#a50770addeaf2a00e6541393c732d9284">strtime</a>(<span class="stringliteral">"%T"</span>) << <span class="stringliteral">"] "</span>;</div><div class="line"> cout << <span class="stringliteral">"Status from: "</span> << status.<a name="a7"></a><a class="code" href="classMastodon_1_1Easy_1_1Status.html#a032164a0170c5217de9e749422a3818e">account</a>().<a name="a8"></a><a class="code" href="classMastodon_1_1Easy_1_1Account.html#ab803e86aa11ef62c03424bc025f8a274">acct</a>()</div><div class="line"> << <span class="stringliteral">" ("</span> << status.<a name="a9"></a><a class="code" href="classMastodon_1_1Easy_1_1Status.html#abc7c9670d2bdc2a7bb6ac75acace3694">url</a>() << <span class="stringliteral">")\n"</span>;</div><div class="line"> <span class="keywordflow">break</span>;</div><div class="line"> }</div><div class="line"> <span class="keywordflow">case</span> Easy::event_type::Notification:</div><div class="line"> {</div><div class="line"> <a name="_a10"></a><a class="code" href="classMastodon_1_1Easy_1_1Notification.html">Easy::Notification</a> notification(event.data);</div><div class="line"> cout << <span class="stringliteral">"Notification involving: "</span></div><div class="line"> << notification.<a name="a11"></a><a class="code" href="classMastodon_1_1Easy_1_1Notification.html#a7dc22950886f1d8d7e03980ac32c3974">account</a>().<a class="code" href="classMastodon_1_1Easy_1_1Account.html#ab803e86aa11ef62c03424bc025f8a274">acct</a>()</div><div class="line"> << <span class="stringliteral">" ("</span> << notification.<a name="a12"></a><a class="code" href="classMastodon_1_1Easy_1_1Notification.html#af55d0d1f176a6d931215684519318c10">id</a>() << <span class="stringliteral">")\n"</span>;</div><div class="line"> <span class="keywordflow">break</span>;</div><div class="line"> }</div><div class="line"> <span class="keywordflow">case</span> Easy::event_type::Delete:</div><div class="line"> {</div><div class="line"> cout << <span class="stringliteral">"Deleted: "</span> << <span class="keyword">event</span>.data << endl;</div><div class="line"> <span class="keywordflow">break</span>;</div><div class="line"> }</div><div class="line"> <span class="keywordflow">case</span> Easy::event_type::Error:</div><div class="line"> {</div><div class="line"> <span class="comment">// Errors are reported in-stream. Print error and exit.</span></div><div class="line"> cerr << <span class="stringliteral">"Error: "</span> << <span class="keyword">event</span>.data << endl;</div><div class="line"> ptr->cancel_stream();</div><div class="line"> <span class="keywordflow">return</span> 1;</div><div class="line"> }</div><div class="line"> <span class="keywordflow">default</span>:</div><div class="line"> {</div><div class="line"> cout << <span class="stringliteral">"Something undefined happened. 😱\n"</span>;</div><div class="line"> cout << <span class="keyword">event</span>.data << endl;</div><div class="line"> }</div><div class="line"> }</div><div class="line"> }</div><div class="line"> }</div><div class="line"></div><div class="line"> <span class="comment">// Close connection.</span></div><div class="line"> ptr->cancel_stream();</div><div class="line"></div><div class="line"> <span class="keywordflow">return</span> 0;</div><div class="line">}</div><div class="line"></div><div class="line"><span class="preprocessor">#else</span></div><div class="line"><span class="preprocessor">#include <cstdio></span></div><div class="line"><span class="keywordtype">int</span> main()</div><div class="line">{</div><div class="line"> std::printf(<span class="stringliteral">"mastodon-cpp was compiled without Easy support.\n"</span>);</div><div class="line"> <span class="keywordflow">return</span> 255;</div><div class="line">}</div><div class="line"><span class="preprocessor">#endif // WITHOUT_EASY</span></div></div><!-- fragment --> </div><!-- contents -->
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