libwebsockets/plugins/protocol_dumb_increment.c
Andy Green 020770566e plugins
This adds support for dynamically loaded plugins at runtime, which
can expose their own protocols or extensions transparently.

With these changes lwsws defaults to OFF in cmake, and if enabled it
automatically enables plugins and libuv support.

Signed-off-by: Andy Green <andy@warmcat.com>
2016-04-07 09:38:08 +08:00

141 lines
3.7 KiB
C

/*
* ws protocol handler plugin for "dumb increment"
*
* Copyright (C) 2010-2016 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.
*/
#include "../lib/libwebsockets.h"
struct per_vhost_data__dumb_increment {
uv_timer_t timeout_watcher;
struct lws_context *context;
struct lws_vhost *vhost;
const struct lws_protocols *protocol;
};
struct per_session_data__dumb_increment {
int number;
};
static void
uv_timeout_cb_dumb_increment(uv_timer_t *w
#if UV_VERSION_MAJOR == 0
, int status
#endif
)
{
struct per_vhost_data__dumb_increment *vhd = lws_container_of(w,
struct per_vhost_data__dumb_increment, timeout_watcher);
lws_callback_on_writable_all_protocol(vhd->context, vhd->protocol);
}
static int
callback_dumb_increment(struct lws *wsi, enum lws_callback_reasons reason,
void *user, void *in, size_t len)
{
struct per_session_data__dumb_increment *pss =
(struct per_session_data__dumb_increment *)user;
struct per_vhost_data__dumb_increment *vhd =
(struct per_vhost_data__dumb_increment *)
lws_protocol_vh_priv_get(lws_vhost_get(wsi),
lws_protocol_get(wsi));
unsigned char buf[LWS_PRE + 512];
unsigned char *p = &buf[LWS_PRE];
int n, m;
switch (reason) {
case LWS_CALLBACK_PROTOCOL_INIT:
vhd = lws_protocol_vh_priv_zalloc(lws_vhost_get(wsi),
lws_protocol_get(wsi),
sizeof(struct per_vhost_data__dumb_increment));
vhd->context = lws_get_context(wsi);
vhd->protocol = lws_protocol_get(wsi);
vhd->vhost = lws_vhost_get(wsi);
uv_timer_init(lws_uv_getloop(vhd->context, 0),
&vhd->timeout_watcher);
uv_timer_start(&vhd->timeout_watcher,
uv_timeout_cb_dumb_increment, 50, 50);
break;
case LWS_CALLBACK_PROTOCOL_DESTROY:
uv_timer_stop(&vhd->timeout_watcher);
break;
case LWS_CALLBACK_ESTABLISHED:
pss->number = 0;
break;
case LWS_CALLBACK_SERVER_WRITEABLE:
n = sprintf((char *)p, "%d", pss->number++);
m = lws_write(wsi, p, 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 (strcmp((const char *)in, "reset\n") == 0)
pss->number = 0;
if (strcmp((const char *)in, "closeme\n") == 0) {
lwsl_notice("dumb_inc: closing as requested\n");
lws_close_reason(wsi, LWS_CLOSE_STATUS_GOINGAWAY,
(unsigned char *)"seeya", 5);
return -1;
}
break;
default:
break;
}
return 0;
}
static const struct lws_protocols protocols[] = {
{
"dumb-increment-protocol",
callback_dumb_increment,
sizeof(struct per_session_data__dumb_increment),
10, /* rx buf size must be >= permessage-deflate rx size */
},
};
LWS_VISIBLE int
init_protocol_dumb_increment(struct lws_context *context,
struct lws_plugin_capability *c)
{
if (c->api_magic != LWS_PLUGIN_API_MAGIC) {
lwsl_err("Plugin API %d, library API %d", LWS_PLUGIN_API_MAGIC,
c->api_magic);
return 1;
}
c->protocols = protocols;
c->count_protocols = ARRAY_SIZE(protocols);
c->extensions = NULL;
c->count_extensions = 0;
return 0;
}
LWS_VISIBLE int
destroy_protocol_dumb_increment(struct lws_context *context)
{
return 0;
}