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584 lines
24 KiB
HTML
584 lines
24 KiB
HTML
<!DOCTYPE html>
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<html>
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<head>
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<meta charset="utf-8">
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<meta name="viewport" content="width=device-width, initial-scale=1.0, user-scalable=yes">
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<title>Extending_the_HTTP-API</title>
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<style type="text/css">
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body {
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* @author Lea Verou
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<h2 id="toc_0">Extending the HTTP-API</h2>
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<p>The HTTP-API is implemented as a collection of <code>httpMethodHandlers</code>. An <code>httpMethodHandler</code> is a pointer to a function that is expected to respond to an HTTP GET request, using the <strong>Cesanta Mongoose</strong> framework. An <code>httpMethodHandler</code> is defined (in <code>trick/WebServer.hh</code>) as follows:</p>
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<div><pre><code class="language-c">typedef void (*httpMethodHandler)(struct mg_connection*, struct http_message*);</code></pre></div>
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<p>Documentation for the <strong>Cesanta Mongoose Networking Library</strong> can be found at:
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<a href="https://cesanta.com/docs/overview/intro.html">https://cesanta.com/docs/overview/intro.html</a></p>
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<h2 id="toc_1">Example HTTP-API Extension</h2>
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<p>Suppose you want your web server to send you a JSON message: </p>
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<div><pre><code class="language-javascript">{ "greeting" : "Hello Trick Sim Developer!" }</code></pre></div>
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<p>when you invoke the URL: <code>http://localhost:8888/api/http/hello</code>.</p>
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<h3 id="toc_2">Creating an <code>httpMethodHandler</code>.</h3>
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<p>The following two files will be our implementation of an <code>httpMethodHandler</code>. We'll put these in some models directory <code>httpMethods/</code>.</p>
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<p><strong><code>handle_HTTP_GET_hello.h</code></strong></p>
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<div><pre><code class="language-c">#ifndef HANDLE_HTTP_GET_HELLO
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#define HANDLE_HTTP_GET_HELLO
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#ifndef SWIG
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void handle_HTTP_GET_hello(struct mg_connection *nc, struct http_message *hm);
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#endif
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#endif</code></pre></div>
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<p><strong><code>handle_HTTP_GET_hello.c</code></strong></p>
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<div><pre><code class="language-c">#include "mongoose/mongoose.h"
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void handle_HTTP_GET_hello(struct mg_connection *nc, struct http_message *hm) {
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mg_printf(nc, "%s", "HTTP/1.1 200 OK\r\nTransfer-Encoding: chunked\r\n\r\n");
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const char* json_text =
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"{ \"greeting\" : \"Hello Trick Sim Developer!\" }";
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mg_printf_http_chunk(nc, "%s", json_text);
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mg_send_http_chunk(nc, "", 0);
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}</code></pre></div>
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<h3 id="toc_3">Installing our <code>httpMethodHandler</code>.</h3>
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<p>We'll do this from our <strong>S_define</strong> file:</p>
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<ul>
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<li><p>Add <code>(httpMethods/handle_HTTP_GET_hello.c)</code> to the <code>LIBRARY DEPENDENCIES</code>.</p></li>
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<li><p>Include our header file:</p>
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<p><code>##include "httpMethods/handle_HTTP_GET_hello.h"</code></p></li>
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</ul>
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<ul>
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<li>In <code>create_connections()</code> add :</li>
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</ul>
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<div><pre><code class="language-c">web.server.installHTTPGEThandler( "hello", &handle_HTTP_GET_hello );</code></pre></div>
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<h3 id="toc_4">A Complete S_define</h3>
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<div><pre><code class="language-cpp">/***********************TRICK HEADER*************************
|
|
PURPOSE:
|
|
(Cannon Numeric)
|
|
LIBRARY DEPENDENCIES:
|
|
(
|
|
(cannon/gravity/src/cannon_init.c)
|
|
(cannon/gravity/src/cannon_numeric.c)
|
|
(httpMethods/handle_HTTP_GET_hello.c)
|
|
)
|
|
*************************************************************/
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|
|
|
#include "sim_objects/default_trick_sys.sm"
|
|
#include "sim_objects/WebServer.sm"
|
|
##include "cannon/gravity/include/cannon_numeric.h"
|
|
##include "httpMethods/handle_HTTP_GET_hello.h"
|
|
|
|
class CannonSimObject : public Trick::SimObject {
|
|
|
|
public:
|
|
CANNON cannon ;
|
|
int foo;
|
|
CannonSimObject() {
|
|
("default_data") cannon_default_data( &cannon ) ;
|
|
("initialization") cannon_init( &cannon ) ;
|
|
("derivative") cannon_deriv( &cannon ) ;
|
|
("integration") trick_ret = cannon_integ( &cannon ) ;
|
|
("dynamic_event") cannon_impact( &cannon) ;
|
|
}
|
|
} ;
|
|
CannonSimObject dyn ;
|
|
|
|
IntegLoop dyn_integloop (0.01) dyn;
|
|
|
|
void create_connections() {
|
|
dyn_integloop.getIntegrator(Runge_Kutta_4, 5);
|
|
web.server.installHTTPGEThandler( "hello", &handle_HTTP_GET_hello );
|
|
}
|
|
</code></pre></div>
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