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example_httpsrv_sse_8c-example.html
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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "https://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" lang="en-US">
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<meta http-equiv="Content-Type" content="text/xhtml;charset=UTF-8"/>
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<meta name="generator" content="Doxygen 1.9.7"/>
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<title>Sagui library: example_httpsrv_sse.c</title>
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<table cellspacing="0" cellpadding="0">
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<tr id="projectrow">
<td id="projectalign">
<div id="projectname">Sagui library<span id="projectnumber"> v3.5.0</span>
</div>
<div id="projectbrief">Cross-platform library which helps to develop web servers or frameworks.</div>
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<li><a href="index.html"><span>Main Page</span></a></li>
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<div class="headertitle"><div class="title">example_httpsrv_sse.c</div></div>
</div><!--header-->
<div class="contents">
<p>Simple example showing a basic SSE (Server-sent events) server.</p>
<div class="fragment"><div class="line"><span class="comment">/* _</span></div>
<div class="line"><span class="comment"> * ___ __ _ __ _ _ _(_)</span></div>
<div class="line"><span class="comment"> * / __|/ _` |/ _` | | | | |</span></div>
<div class="line"><span class="comment"> * \__ \ (_| | (_| | |_| | |</span></div>
<div class="line"><span class="comment"> * |___/\__,_|\__, |\__,_|_|</span></div>
<div class="line"><span class="comment"> * |___/</span></div>
<div class="line"><span class="comment"> *</span></div>
<div class="line"><span class="comment"> * Cross-platform library which helps to develop web servers or frameworks.</span></div>
<div class="line"><span class="comment"> *</span></div>
<div class="line"><span class="comment"> * Copyright (C) 2016-2020 Silvio Clecio <silvioprog@gmail.com></span></div>
<div class="line"><span class="comment"> *</span></div>
<div class="line"><span class="comment"> * Sagui library is free software; you can redistribute it and/or</span></div>
<div class="line"><span class="comment"> * modify it under the terms of the GNU Lesser General Public</span></div>
<div class="line"><span class="comment"> * License as published by the Free Software Foundation; either</span></div>
<div class="line"><span class="comment"> * version 2.1 of the License, or (at your option) any later version.</span></div>
<div class="line"><span class="comment"> *</span></div>
<div class="line"><span class="comment"> * Sagui library is distributed in the hope that it will be useful,</span></div>
<div class="line"><span class="comment"> * but WITHOUT ANY WARRANTY; without even the implied warranty of</span></div>
<div class="line"><span class="comment"> * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU</span></div>
<div class="line"><span class="comment"> * Lesser General Public License for more details.</span></div>
<div class="line"><span class="comment"> *</span></div>
<div class="line"><span class="comment"> * You should have received a copy of the GNU Lesser General Public</span></div>
<div class="line"><span class="comment"> * License along with Sagui library; if not, write to the Free Software</span></div>
<div class="line"><span class="comment"> * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA</span></div>
<div class="line"><span class="comment"> */</span></div>
<div class="line"> </div>
<div class="line"><span class="preprocessor">#include <stdio.h></span></div>
<div class="line"><span class="preprocessor">#include <stdlib.h></span></div>
<div class="line"><span class="preprocessor">#include <stdint.h></span></div>
<div class="line"><span class="preprocessor">#include <string.h></span></div>
<div class="line"><span class="preprocessor">#ifdef _WIN32</span></div>
<div class="line"><span class="preprocessor">#include <windows.h></span></div>
<div class="line"><span class="preprocessor">#else </span><span class="comment">/* _WIN32 */</span><span class="preprocessor"></span></div>
<div class="line"><span class="preprocessor">#include <unistd.h></span></div>
<div class="line"><span class="preprocessor">#endif </span><span class="comment">/* _WIN32 */</span><span class="preprocessor"></span></div>
<div class="line"><span class="preprocessor">#include <<a class="code" href="sagui_8h.html">sagui.h</a>></span></div>
<div class="line"> </div>
<div class="line"><span class="comment">/* NOTE: Error checking has been omitted to make it clear. */</span></div>
<div class="line"> </div>
<div class="line"><span class="preprocessor">#define PAGE \</span></div>
<div class="line"><span class="preprocessor"> "<html>\n"</span> \</div>
<div class="line"> "<head>\n" \</div>
<div class="line"> "<title>SSE example</title>\n" \</div>
<div class="line"> "</head><body><h2 id=\"counter\">Please wait ...</h2>\n" \</div>
<div class="line"> "<script>\n" \</div>
<div class="line"> "const es = new EventSource('/');\n" \</div>
<div class="line"> "es.onmessage = function (ev) {\n" \</div>
<div class="line"> " document.getElementById('counter').innerText = 'Counting: ' + ev.data;\n" \</div>
<div class="line"> "};\n" \</div>
<div class="line"> "</script>\n" \</div>
<div class="line"> "</body>\n" \</div>
<div class="line"> "</html>"</div>
<div class="line"> </div>
<div class="line"><span class="keyword">static</span> <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> COUNT = 0;</div>
<div class="line"> </div>
<div class="line"><span class="preprocessor">#ifdef _WIN32</span></div>
<div class="line"><span class="preprocessor">#define sleep Sleep</span></div>
<div class="line"><span class="preprocessor">#endif </span><span class="comment">/* _WIN32 */</span><span class="preprocessor"></span></div>
<div class="line"> </div>
<div class="line"><span class="keyword">static</span> ssize_t sse_read_cb(__SG_UNUSED <span class="keywordtype">void</span> *handle, uint64_t offset, <span class="keywordtype">char</span> *buf,</div>
<div class="line"> <span class="keywordtype">size_t</span> size) {</div>
<div class="line"> <span class="keywordtype">char</span> msg[20];</div>
<div class="line"> <span class="keywordflow">if</span> (offset == 0) {</div>
<div class="line"> size = sprintf(msg, <span class="stringliteral">"retry: 1000\n"</span>);</div>
<div class="line"> } <span class="keywordflow">else</span> {</div>
<div class="line"> size = sprintf(msg, <span class="stringliteral">"data: %d\n\n"</span>, ++COUNT);</div>
<div class="line"> sleep(1);</div>
<div class="line"> }</div>
<div class="line"> memcpy(buf, msg, size);</div>
<div class="line"> msg[size] = <span class="charliteral">'\0'</span>;</div>
<div class="line"> <span class="keywordflow">return</span> size;</div>
<div class="line">}</div>
<div class="line"> </div>
<div class="line"><span class="keyword">static</span> <span class="keywordtype">void</span> req_cb(__SG_UNUSED <span class="keywordtype">void</span> *cls, <span class="keyword">struct</span> <a id="_a0" name="_a0"></a><a class="code hl_struct" href="structsg__httpreq.html">sg_httpreq</a> *req,</div>
<div class="line"> <span class="keyword">struct</span> <a id="_a1" name="_a1"></a><a class="code hl_struct" href="structsg__httpres.html">sg_httpres</a> *res) {</div>
<div class="line"> <span class="keyword">struct </span><a id="_a2" name="_a2"></a><a class="code hl_struct" href="structsg__strmap.html">sg_strmap</a> *pair;</div>
<div class="line"> <span class="keyword">struct </span><a class="code hl_struct" href="structsg__strmap.html">sg_strmap</a> **req_headers = <a id="a3" name="a3"></a><a class="code hl_function" href="group__sg__httpsrv.html#gaa1361cb25ce836e2a2672517b5e06078">sg_httpreq_headers</a>(req);</div>
<div class="line"> <span class="keyword">struct </span><a class="code hl_struct" href="structsg__strmap.html">sg_strmap</a> **res_headers = <a id="a4" name="a4"></a><a class="code hl_function" href="group__sg__httpsrv.html#ga0c532046ea6afb0f856653cbd21e9977">sg_httpres_headers</a>(res);</div>
<div class="line"> <span class="keywordflow">if</span> (<a id="a5" name="a5"></a><a class="code hl_function" href="group__sg__strmap.html#ga9c8c4b079f486d296c1a8fb7484ca69e">sg_strmap_find</a>(*req_headers, <span class="stringliteral">"Accept"</span>, &pair) == 0 &&</div>
<div class="line"> strstr(<a id="a6" name="a6"></a><a class="code hl_function" href="group__sg__strmap.html#ga65a57718c80347ed1182621096caef42">sg_strmap_val</a>(pair), <span class="stringliteral">"text/event-stream"</span>)) {</div>
<div class="line"> <a id="a7" name="a7"></a><a class="code hl_function" href="group__sg__strmap.html#ga10f0b8c0917fc1c30d0c387abc163edf">sg_strmap_set</a>(res_headers, <span class="stringliteral">"Access-Control-Allow-Origin"</span>, <span class="stringliteral">"*"</span>);</div>
<div class="line"> <a class="code hl_function" href="group__sg__strmap.html#ga10f0b8c0917fc1c30d0c387abc163edf">sg_strmap_set</a>(res_headers, <span class="stringliteral">"Content-Type"</span>, <span class="stringliteral">"text/event-stream"</span>);</div>
<div class="line"> <a id="a8" name="a8"></a><a class="code hl_function" href="group__sg__httpsrv.html#gae38e335aa49865396adbd3146b064731">sg_httpres_sendstream</a>(res, 0, sse_read_cb, NULL, NULL, 200);</div>
<div class="line"> <span class="keywordflow">return</span>;</div>
<div class="line"> }</div>
<div class="line"> <span class="keywordflow">if</span> (strcmp(<a id="a9" name="a9"></a><a class="code hl_function" href="group__sg__httpsrv.html#gacfc74e225374dfcb257a69d43204ee34">sg_httpreq_path</a>(req), <span class="stringliteral">"/favicon.ico"</span>) == 0) {</div>
<div class="line"> <a id="a10" name="a10"></a><a class="code hl_define" href="group__sg__httpsrv.html#gae64c67ed9caee0189cf4fd669a869255">sg_httpres_send</a>(res, <span class="stringliteral">""</span>, <span class="stringliteral">""</span>, 204);</div>
<div class="line"> <span class="keywordflow">return</span>;</div>
<div class="line"> }</div>
<div class="line"> <a class="code hl_define" href="group__sg__httpsrv.html#gae64c67ed9caee0189cf4fd669a869255">sg_httpres_send</a>(res, PAGE, <span class="stringliteral">"text/html; charset=utf-8"</span>, 200);</div>
<div class="line">}</div>
<div class="line"> </div>
<div class="line"><span class="keywordtype">int</span> main(<span class="keywordtype">int</span> argc, <span class="keyword">const</span> <span class="keywordtype">char</span> *argv[]) {</div>
<div class="line"> <span class="keyword">struct </span><a id="_a11" name="_a11"></a><a class="code hl_struct" href="structsg__httpsrv.html">sg_httpsrv</a> *srv;</div>
<div class="line"> <span class="keywordflow">if</span> (argc != 2) {</div>
<div class="line"> printf(<span class="stringliteral">"%s <PORT>\n"</span>, argv[0]);</div>
<div class="line"> <span class="keywordflow">return</span> EXIT_FAILURE;</div>
<div class="line"> }</div>
<div class="line"> srv = <a id="a12" name="a12"></a><a class="code hl_function" href="group__sg__httpsrv.html#ga56b59921f35e8fac91c48ddb0669b5d1">sg_httpsrv_new</a>(req_cb, NULL);</div>
<div class="line"> <span class="keywordflow">if</span> (!<a id="a13" name="a13"></a><a class="code hl_function" href="group__sg__httpsrv.html#gafa768c07cdd78f78c14a5daaafd4c20a">sg_httpsrv_listen</a>(srv, strtol(argv[1], NULL, 10), <span class="keyword">true</span>)) {</div>
<div class="line"> <a id="a14" name="a14"></a><a class="code hl_function" href="group__sg__httpsrv.html#gac377679c831c0b428ee80b2f63174bf8">sg_httpsrv_free</a>(srv);</div>
<div class="line"> <span class="keywordflow">return</span> EXIT_FAILURE;</div>
<div class="line"> }</div>
<div class="line"> fprintf(stdout, <span class="stringliteral">"Server running at http://localhost:%d\n"</span>,</div>
<div class="line"> <a id="a15" name="a15"></a><a class="code hl_function" href="group__sg__httpsrv.html#gafdc2bab56e952bd8395f2ebfd91469f5">sg_httpsrv_port</a>(srv));</div>
<div class="line"> fflush(stdout);</div>
<div class="line"> getchar();</div>
<div class="line"> <a class="code hl_function" href="group__sg__httpsrv.html#gac377679c831c0b428ee80b2f63174bf8">sg_httpsrv_free</a>(srv);</div>
<div class="line"> <span class="keywordflow">return</span> EXIT_SUCCESS;</div>
<div class="line">}</div>
<div class="ttc" id="agroup__sg__httpsrv_html_ga0c532046ea6afb0f856653cbd21e9977"><div class="ttname"><a href="group__sg__httpsrv.html#ga0c532046ea6afb0f856653cbd21e9977">sg_httpres_headers</a></div><div class="ttdeci">struct sg_strmap ** sg_httpres_headers(struct sg_httpres *res)</div></div>
<div class="ttc" id="agroup__sg__httpsrv_html_ga56b59921f35e8fac91c48ddb0669b5d1"><div class="ttname"><a href="group__sg__httpsrv.html#ga56b59921f35e8fac91c48ddb0669b5d1">sg_httpsrv_new</a></div><div class="ttdeci">struct sg_httpsrv * sg_httpsrv_new(sg_httpreq_cb cb, void *cls) __attribute__((malloc))</div></div>
<div class="ttc" id="agroup__sg__httpsrv_html_gaa1361cb25ce836e2a2672517b5e06078"><div class="ttname"><a href="group__sg__httpsrv.html#gaa1361cb25ce836e2a2672517b5e06078">sg_httpreq_headers</a></div><div class="ttdeci">struct sg_strmap ** sg_httpreq_headers(struct sg_httpreq *req)</div></div>
<div class="ttc" id="agroup__sg__httpsrv_html_gac377679c831c0b428ee80b2f63174bf8"><div class="ttname"><a href="group__sg__httpsrv.html#gac377679c831c0b428ee80b2f63174bf8">sg_httpsrv_free</a></div><div class="ttdeci">void sg_httpsrv_free(struct sg_httpsrv *srv)</div></div>
<div class="ttc" id="agroup__sg__httpsrv_html_gacfc74e225374dfcb257a69d43204ee34"><div class="ttname"><a href="group__sg__httpsrv.html#gacfc74e225374dfcb257a69d43204ee34">sg_httpreq_path</a></div><div class="ttdeci">const char * sg_httpreq_path(struct sg_httpreq *req)</div></div>
<div class="ttc" id="agroup__sg__httpsrv_html_gae38e335aa49865396adbd3146b064731"><div class="ttname"><a href="group__sg__httpsrv.html#gae38e335aa49865396adbd3146b064731">sg_httpres_sendstream</a></div><div class="ttdeci">int sg_httpres_sendstream(struct sg_httpres *res, uint64_t size, sg_read_cb read_cb, void *handle, sg_free_cb free_cb, unsigned int status)</div></div>
<div class="ttc" id="agroup__sg__httpsrv_html_gae64c67ed9caee0189cf4fd669a869255"><div class="ttname"><a href="group__sg__httpsrv.html#gae64c67ed9caee0189cf4fd669a869255">sg_httpres_send</a></div><div class="ttdeci">#define sg_httpres_send(res, val, content_type, status)</div><div class="ttdef"><b>Definition</b> sagui.h:1032</div></div>
<div class="ttc" id="agroup__sg__httpsrv_html_gafa768c07cdd78f78c14a5daaafd4c20a"><div class="ttname"><a href="group__sg__httpsrv.html#gafa768c07cdd78f78c14a5daaafd4c20a">sg_httpsrv_listen</a></div><div class="ttdeci">bool sg_httpsrv_listen(struct sg_httpsrv *srv, uint16_t port, bool threaded)</div></div>
<div class="ttc" id="agroup__sg__httpsrv_html_gafdc2bab56e952bd8395f2ebfd91469f5"><div class="ttname"><a href="group__sg__httpsrv.html#gafdc2bab56e952bd8395f2ebfd91469f5">sg_httpsrv_port</a></div><div class="ttdeci">uint16_t sg_httpsrv_port(struct sg_httpsrv *srv)</div></div>
<div class="ttc" id="agroup__sg__strmap_html_ga10f0b8c0917fc1c30d0c387abc163edf"><div class="ttname"><a href="group__sg__strmap.html#ga10f0b8c0917fc1c30d0c387abc163edf">sg_strmap_set</a></div><div class="ttdeci">int sg_strmap_set(struct sg_strmap **map, const char *name, const char *val)</div></div>
<div class="ttc" id="agroup__sg__strmap_html_ga65a57718c80347ed1182621096caef42"><div class="ttname"><a href="group__sg__strmap.html#ga65a57718c80347ed1182621096caef42">sg_strmap_val</a></div><div class="ttdeci">const char * sg_strmap_val(struct sg_strmap *pair)</div></div>
<div class="ttc" id="agroup__sg__strmap_html_ga9c8c4b079f486d296c1a8fb7484ca69e"><div class="ttname"><a href="group__sg__strmap.html#ga9c8c4b079f486d296c1a8fb7484ca69e">sg_strmap_find</a></div><div class="ttdeci">int sg_strmap_find(struct sg_strmap *map, const char *name, struct sg_strmap **pair)</div></div>
<div class="ttc" id="asagui_8h_html"><div class="ttname"><a href="sagui_8h.html">sagui.h</a></div></div>
<div class="ttc" id="astructsg__httpreq_html"><div class="ttname"><a href="structsg__httpreq.html">sg_httpreq</a></div></div>
<div class="ttc" id="astructsg__httpres_html"><div class="ttname"><a href="structsg__httpres.html">sg_httpres</a></div></div>
<div class="ttc" id="astructsg__httpsrv_html"><div class="ttname"><a href="structsg__httpsrv.html">sg_httpsrv</a></div></div>
<div class="ttc" id="astructsg__strmap_html"><div class="ttname"><a href="structsg__strmap.html">sg_strmap</a></div></div>
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