
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>
177 lines
4.6 KiB
C
177 lines
4.6 KiB
C
/*
|
|
* libwebsockets-test-server - libwebsockets test implementation
|
|
*
|
|
* 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.
|
|
*
|
|
* The test apps 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"
|
|
|
|
/* lws-mirror_protocol */
|
|
|
|
#define MAX_MESSAGE_QUEUE 512
|
|
|
|
struct per_session_data__lws_mirror {
|
|
struct lws *wsi;
|
|
int ringbuffer_tail;
|
|
};
|
|
|
|
struct a_message {
|
|
void *payload;
|
|
size_t len;
|
|
};
|
|
|
|
struct per_vhost_data__lws_mirror {
|
|
struct a_message ringbuffer[MAX_MESSAGE_QUEUE];
|
|
int ringbuffer_head;
|
|
};
|
|
|
|
static int
|
|
callback_lws_mirror(struct lws *wsi, enum lws_callback_reasons reason,
|
|
void *user, void *in, size_t len)
|
|
{
|
|
struct per_session_data__lws_mirror *pss =
|
|
(struct per_session_data__lws_mirror *)user;
|
|
struct per_vhost_data__lws_mirror *v =
|
|
(struct per_vhost_data__lws_mirror *)
|
|
lws_protocol_vh_priv_get(lws_vhost_get(wsi),
|
|
lws_protocol_get(wsi));
|
|
int n, m;
|
|
|
|
switch (reason) {
|
|
|
|
case LWS_CALLBACK_ESTABLISHED:
|
|
lwsl_info("%s: LWS_CALLBACK_ESTABLISHED\n", __func__);
|
|
pss->ringbuffer_tail = v->ringbuffer_head;
|
|
pss->wsi = wsi;
|
|
break;
|
|
|
|
case LWS_CALLBACK_PROTOCOL_INIT: /* per vhost */
|
|
lws_protocol_vh_priv_zalloc(lws_vhost_get(wsi),
|
|
lws_protocol_get(wsi),
|
|
sizeof(struct per_vhost_data__lws_mirror));
|
|
break;
|
|
|
|
case LWS_CALLBACK_PROTOCOL_DESTROY: /* per vhost */
|
|
lwsl_info("%s: mirror protocol cleaning up %p\n", __func__, v);
|
|
for (n = 0; n < ARRAY_SIZE(v->ringbuffer); n++)
|
|
if (v->ringbuffer[n].payload) {
|
|
free(v->ringbuffer[n].payload);
|
|
v->ringbuffer[n].payload = NULL;
|
|
}
|
|
break;
|
|
|
|
case LWS_CALLBACK_SERVER_WRITEABLE:
|
|
while (pss->ringbuffer_tail != v->ringbuffer_head) {
|
|
m = v->ringbuffer[pss->ringbuffer_tail].len;
|
|
n = lws_write(wsi, (unsigned char *)
|
|
v->ringbuffer[pss->ringbuffer_tail].payload +
|
|
LWS_PRE, m, LWS_WRITE_TEXT);
|
|
if (n < 0) {
|
|
lwsl_err("ERROR %d writing to mirror socket\n", n);
|
|
return -1;
|
|
}
|
|
if (n < m)
|
|
lwsl_err("mirror partial write %d vs %d\n", n, m);
|
|
|
|
if (pss->ringbuffer_tail == (MAX_MESSAGE_QUEUE - 1))
|
|
pss->ringbuffer_tail = 0;
|
|
else
|
|
pss->ringbuffer_tail++;
|
|
|
|
if (((v->ringbuffer_head - pss->ringbuffer_tail) &
|
|
(MAX_MESSAGE_QUEUE - 1)) == (MAX_MESSAGE_QUEUE - 15))
|
|
lws_rx_flow_allow_all_protocol(lws_get_context(wsi),
|
|
lws_get_protocol(wsi));
|
|
|
|
if (lws_send_pipe_choked(wsi)) {
|
|
lws_callback_on_writable(wsi);
|
|
break;
|
|
}
|
|
}
|
|
break;
|
|
|
|
case LWS_CALLBACK_RECEIVE:
|
|
if (((v->ringbuffer_head - pss->ringbuffer_tail) &
|
|
(MAX_MESSAGE_QUEUE - 1)) == (MAX_MESSAGE_QUEUE - 1)) {
|
|
lwsl_err("dropping!\n");
|
|
goto choke;
|
|
}
|
|
|
|
if (v->ringbuffer[v->ringbuffer_head].payload)
|
|
free(v->ringbuffer[v->ringbuffer_head].payload);
|
|
|
|
v->ringbuffer[v->ringbuffer_head].payload = malloc(LWS_PRE + len);
|
|
v->ringbuffer[v->ringbuffer_head].len = len;
|
|
memcpy((char *)v->ringbuffer[v->ringbuffer_head].payload +
|
|
LWS_PRE, in, len);
|
|
if (v->ringbuffer_head == (MAX_MESSAGE_QUEUE - 1))
|
|
v->ringbuffer_head = 0;
|
|
else
|
|
v->ringbuffer_head++;
|
|
|
|
if (((v->ringbuffer_head - pss->ringbuffer_tail) &
|
|
(MAX_MESSAGE_QUEUE - 1)) != (MAX_MESSAGE_QUEUE - 2))
|
|
goto done;
|
|
|
|
choke:
|
|
lwsl_debug("LWS_CALLBACK_RECEIVE: throttling %p\n", wsi);
|
|
lws_rx_flow_control(wsi, 0);
|
|
|
|
done:
|
|
lws_callback_on_writable_all_protocol(lws_get_context(wsi),
|
|
lws_get_protocol(wsi));
|
|
break;
|
|
|
|
default:
|
|
break;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct lws_protocols protocols[] = {
|
|
{
|
|
"lws-mirror-protocol",
|
|
callback_lws_mirror,
|
|
sizeof(struct per_session_data__lws_mirror),
|
|
128, /* rx buf size must be >= permessage-deflate rx size */
|
|
},
|
|
};
|
|
|
|
LWS_VISIBLE int
|
|
init_protocol_lws_mirror(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_lws_mirror(struct lws_context *context)
|
|
{
|
|
return 0;
|
|
}
|
|
|