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Ecore_Con_Url - customizing a request

This is a simple example that shows how to make a custom request using Ecore_Con_Url.

The full source code for this example can be found at ecore_con_url_headers_example.c.

The first part of the example is setting the callbacks to be called when an ECORE_CON_EVENT_URL_DATA or ECORE_CON_EVENT_URL_COMPLETE event is received. These are the callbacks that are going to be used with this:

static Eina_Bool
_url_data_cb(void *data EINA_UNUSED, int type EINA_UNUSED, void *event_info)
{
Ecore_Con_Event_Url_Data *url_data = event_info;
int i;
for (i = 0; i < url_data->size; i++)
printf("%c", url_data->data[i]);
return EINA_TRUE;
}
static Eina_Bool
_url_complete_cb(void *data EINA_UNUSED, int type EINA_UNUSED, void *event_info)
{
Ecore_Con_Event_Url_Complete *url_complete = event_info;
const Eina_List *headers, *l;
char *str;
printf("\n");
printf("download completed with status code: %d\n", url_complete->status);
headers = ecore_con_url_response_headers_get(url_complete->url_con);
EINA_LIST_FOREACH(headers, l, str)
printf("header: %s\n", str);
ecore_main_loop_quit();
return EINA_TRUE;
}

The `main` code is as simple as the Ecore_Con_Url example. It contains some checks for the arguments to see if a GET or POST request is required:

int
main(int argc, const char *argv[])
{
Ecore_Con_Url *ec_url = NULL;
const char *type;
Eina_Bool r;
if (argc < 3)
{
printf("need at least two parameters: < POST|GET > <url1>\n");
return -1;
}

Then we start our required libraries and configure a global option to use pipelined requests:

type = argv[1];
if (strcmp(type, "POST") && (strcmp(type, "GET")))
{
printf("only POST or GET are supported by this example.\n");
return -1;
}
ecore_init();
ecore_con_init();
ecore_con_url_init();
// check if requests are being pipelined, and set them if not:
if (!ecore_con_url_pipeline_get())
ecore_con_url_pipeline_set(EINA_TRUE);

Now we create our request object, but using ecore_con_url_custom_new() to use a POST or GET method depending on the command line arguments. And we also add the event handlers for our callbacks:

ec_url = ecore_con_url_custom_new(argv[2], type);
if (!ec_url)
{
printf("error when creating ecore con url object.\n");
goto end;
}
ecore_event_handler_add(ECORE_CON_EVENT_URL_DATA, _url_data_cb, NULL);
ecore_event_handler_add(ECORE_CON_EVENT_URL_COMPLETE, _url_complete_cb, NULL);

In order to demonstrate our API, some options are set to this request before actually performing it:

ecore_con_url_additional_header_add(ec_url, "User-Agent", "blablabla");
ecore_con_url_verbose_set(ec_url, EINA_TRUE);
ecore_con_url_httpauth_set(ec_url, "user", "password", EINA_FALSE);
ecore_con_url_time(ec_url, ECORE_CON_URL_TIME_IFMODSINCE, 0);

Depending on what kind of request was asked (GET or POST), we use one of the specific functions to perform it:

if (!strcmp(type, "GET"))
r = ecore_con_url_get(ec_url);
else
r = ecore_con_url_post(ec_url, NULL, 0, NULL);

After that, we just check for errors, start the main loop, free resources and finally exit:

if (!r)
{
printf("could not realize request.\n");
goto free_ec_url;
}
ecore_main_loop_begin();
free_ec_url:
ecore_con_url_free(ec_url);
end:
ecore_con_url_shutdown();
ecore_con_shutdown();
ecore_shutdown();
return 0;
}