websockets.c
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#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <libwebsockets.h>
#define MAX_FRAME_SIZE 1024
#define WAIT_DELAY 50
static int callback_http(struct libwebsocket_context *this, struct libwebsocket *wsi, enum libwebsocket_callback_reasons reason, void *user,void *in,size_t len)
{
return 0;
}
static int callback_my(struct libwebsocket_context * this, struct libwebsocket *wsi, enum libwebsocket_callback_reasons reason, void *user,void *in,size_t len)
{
static char *message = NULL;
static char *reponse = NULL;
static int msize=0;
switch(reason)
{
case LWS_CALLBACK_ESTABLISHED:
printf("connection established\n");
message=NULL;
// Declenchement d'un prochain envoi au navigateur
libwebsocket_callback_on_writable(this,wsi);
break;
case LWS_CALLBACK_RECEIVE:
// Ici sont traites les messages envoyes par le navigateur
printf("received data: %s\n",(char *)in);
message=malloc(len+LWS_SEND_BUFFER_PRE_PADDING+LWS_SEND_BUFFER_POST_PADDING);
if(message==NULL)
{
perror("callback_my.malloc"); exit(EXIT_FAILURE);
}
memcpy(message+LWS_SEND_BUFFER_PRE_PADDING,in,len);
// Declenchement d'un prochain envoi au navigateur
msize=len;
libwebsocket_callback_on_writable(this,wsi);
break;
case LWS_CALLBACK_SERVER_WRITEABLE:
// Ici sont envoyes les messages au navigateur
if(message!= NULL)
{
char *text = "number : ";
int length = strlen (text);
unsigned char *buf = malloc(LWS_SEND_BUFFER_PRE_PADDING + length + LWS_SEND_BUFFER_POST_PADDING);
memcpy (buf + LWS_SEND_BUFFER_PRE_PADDING, text, length );
libwebsocket_write(wsi, buf + LWS_SEND_BUFFER_PRE_PADDING, length, LWS_WRITE_TEXT);
free(buf);
free(message);
message = NULL;
}
break;
default:
break;
}
return 0;
}
static struct libwebsocket_protocols protocols[] = {
{
"http-only", // name
callback_http, // callback
0, // data size
0 // maximum frame size
},
{"myprotocol",callback_my,0,MAX_FRAME_SIZE},
{NULL,NULL,0,0}
};
int main(void)
{
int port=9000;
struct lws_context_creation_info info;
memset(&info,0,sizeof info);
info.port=port;
info.protocols=protocols;
info.gid=-1;
info.uid=-1;
struct libwebsocket_context *context=libwebsocket_create_context(&info);
if(context==NULL)
{
fprintf(stderr, "libwebsocket init failed\n");
return -1;
}
printf("starting server...\n");
while(1)
{
libwebsocket_service(context,WAIT_DELAY);
}
libwebsocket_context_destroy(context);
return 0;
}