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/*
* ws protocol handler plugin for "dumb increment"
*
* Written in 2010-2019 by Andy Green <andy@warmcat.com>
*
* This file is made available under the Creative Commons CC0 1.0
* Universal Public Domain Dedication.
*
* The person who associated a work with this deed has dedicated
* the work to the public domain by waiving all of his or her rights
* to the work worldwide under copyright law, including all related
* and neighboring rights, to the extent allowed by law. You can copy,
* modify, distribute and perform the work, even for commercial purposes,
* all without asking permission.
*
* These test plugins are intended to be adapted for use in your code, which
* may be proprietary. So unlike the library itself, they are licensed
* Public Domain.
*/
#if !defined (LWS_PLUGIN_STATIC)
#if !defined(LWS_DLL)
#define LWS_DLL
#endif
#if !defined(LWS_INTERNAL)
#define LWS_INTERNAL
#endif
#include <libwebsockets.h>
#endif
#include <string.h>
#define DUMB_PERIOD_US 50000
struct pss__dumb_increment {
int number;
};
struct vhd__dumb_increment {
const unsigned int *options;
};
static int
callback_dumb_increment(struct lws *wsi, enum lws_callback_reasons reason,
void *user, void *in, size_t len)
{
struct pss__dumb_increment *pss = (struct pss__dumb_increment *)user;
struct vhd__dumb_increment *vhd =
(struct vhd__dumb_increment *)
lws_protocol_vh_priv_get(lws_get_vhost(wsi),
lws_get_protocol(wsi));
uint8_t buf[LWS_PRE + 20], *p = &buf[LWS_PRE];
const struct lws_protocol_vhost_options *opt;
int n, m;
switch (reason) {
case LWS_CALLBACK_PROTOCOL_INIT:
vhd = lws_protocol_vh_priv_zalloc(lws_get_vhost(wsi),
lws_get_protocol(wsi),
sizeof(struct vhd__dumb_increment));
if (!vhd)
return 0;
if ((opt = lws_pvo_search(
(const struct lws_protocol_vhost_options *)in,
"options")))
vhd->options = (unsigned int *)opt->value;
break;
case LWS_CALLBACK_ESTABLISHED:
pss->number = 0;
if (!vhd->options || !((*vhd->options) & 1))
lws_set_timer_usecs(wsi, DUMB_PERIOD_US);
break;
case LWS_CALLBACK_SERVER_WRITEABLE:
n = lws_snprintf((char *)p, sizeof(buf) - LWS_PRE, "%d",
pss->number++);
m = lws_write(wsi, p, (unsigned int)n, LWS_WRITE_TEXT);
if (m < n) {
lwsl_err("ERROR %d writing to di socket\n", n);
return -1;
}
break;
case LWS_CALLBACK_RECEIVE:
if (len < 6)
break;
if (strncmp((const char *)in, "reset\n", 6) == 0)
pss->number = 0;
if (strncmp((const char *)in, "closeme\n", 8) == 0) {
lwsl_notice("dumb_inc: closing as requested\n");
lws_close_reason(wsi, LWS_CLOSE_STATUS_GOINGAWAY,
(unsigned char *)"seeya", 5);
return -1;
}
break;
case LWS_CALLBACK_TIMER:
if (!vhd->options || !((*vhd->options) & 1)) {
lws_callback_on_writable_all_protocol_vhost(
lws_get_vhost(wsi), lws_get_protocol(wsi));
lws_set_timer_usecs(wsi, DUMB_PERIOD_US);
}
break;
default:
break;
}
return 0;
}
#define LWS_PLUGIN_PROTOCOL_DUMB_INCREMENT \
{ \
"dumb-increment-protocol", \
callback_dumb_increment, \
sizeof(struct pss__dumb_increment), \
10, /* rx buf size must be >= permessage-deflate rx size */ \
0, NULL, 0 \
}
#if !defined (LWS_PLUGIN_STATIC)
LWS_VISIBLE const struct lws_protocols dumb_increment_protocols[] = {
LWS_PLUGIN_PROTOCOL_DUMB_INCREMENT
};
LWS_VISIBLE const lws_plugin_protocol_t dumb_increment = {
.hdr = {
"dumb increment",
"lws_protocol_plugin",
LWS_BUILD_HASH,
LWS_PLUGIN_API_MAGIC
},
.protocols = dumb_increment_protocols,
.count_protocols = LWS_ARRAY_SIZE(dumb_increment_protocols),
.extensions = NULL,
.count_extensions = 0,
};
#endif
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