214 lines
7.5 KiB
C++
214 lines
7.5 KiB
C++
/*************************************************************************/
|
|
/* lws_helper.h */
|
|
/*************************************************************************/
|
|
/* This file is part of: */
|
|
/* GODOT ENGINE */
|
|
/* https://godotengine.org */
|
|
/*************************************************************************/
|
|
/* Copyright (c) 2007-2017 Juan Linietsky, Ariel Manzur. */
|
|
/* Copyright (c) 2014-2017 Godot Engine contributors (cf. AUTHORS.md) */
|
|
/* */
|
|
/* Permission is hereby granted, free of charge, to any person obtaining */
|
|
/* a copy of this software and associated documentation files (the */
|
|
/* "Software"), to deal in the Software without restriction, including */
|
|
/* without limitation the rights to use, copy, modify, merge, publish, */
|
|
/* distribute, sublicense, and/or sell copies of the Software, and to */
|
|
/* permit persons to whom the Software is furnished to do so, subject to */
|
|
/* the following conditions: */
|
|
/* */
|
|
/* The above copyright notice and this permission notice shall be */
|
|
/* included in all copies or substantial portions of the Software. */
|
|
/* */
|
|
/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, */
|
|
/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF */
|
|
/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.*/
|
|
/* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY */
|
|
/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, */
|
|
/* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE */
|
|
/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */
|
|
/*************************************************************************/
|
|
#ifndef LWS_HELPER_H
|
|
#define LWS_HELPER_H
|
|
|
|
#include "core/io/stream_peer.h"
|
|
#include "core/os/os.h"
|
|
#include "core/reference.h"
|
|
#include "core/ring_buffer.h"
|
|
#include "lws_peer.h"
|
|
|
|
struct _LWSRef {
|
|
bool free_context;
|
|
bool is_polling;
|
|
bool is_valid;
|
|
bool is_destroying;
|
|
void *obj;
|
|
struct lws_protocols *lws_structs;
|
|
char *lws_names;
|
|
};
|
|
|
|
static _LWSRef *_lws_create_ref(void *obj) {
|
|
|
|
_LWSRef *out = (_LWSRef *)memalloc(sizeof(_LWSRef));
|
|
out->is_destroying = false;
|
|
out->free_context = false;
|
|
out->is_polling = false;
|
|
out->obj = obj;
|
|
out->is_valid = true;
|
|
out->lws_structs = NULL;
|
|
out->lws_names = NULL;
|
|
return out;
|
|
}
|
|
|
|
static void _lws_free_ref(_LWSRef *ref) {
|
|
// Free strings and structs
|
|
memfree(ref->lws_structs);
|
|
memfree(ref->lws_names);
|
|
// Free ref
|
|
memfree(ref);
|
|
}
|
|
|
|
static bool _lws_destroy(struct lws_context *context, _LWSRef *ref) {
|
|
if (context == NULL || ref->is_destroying)
|
|
return false;
|
|
|
|
if (ref->is_polling) {
|
|
ref->free_context = true;
|
|
return false;
|
|
}
|
|
|
|
ref->is_destroying = true;
|
|
lws_context_destroy(context);
|
|
_lws_free_ref(ref);
|
|
return true;
|
|
}
|
|
|
|
static bool _lws_poll(struct lws_context *context, _LWSRef *ref) {
|
|
|
|
ERR_FAIL_COND_V(context == NULL, false);
|
|
ERR_FAIL_COND_V(ref == NULL, false);
|
|
|
|
ref->is_polling = true;
|
|
lws_service(context, 0);
|
|
ref->is_polling = false;
|
|
|
|
if (!ref->free_context)
|
|
return false; // Nothing to do
|
|
|
|
bool is_valid = ref->is_valid; // Might have been destroyed by poll
|
|
|
|
_lws_destroy(context, ref); // Will destroy context and ref
|
|
|
|
return is_valid; // If the object should NULL its context and ref
|
|
}
|
|
|
|
/*
|
|
* prepare the protocol_structs to be fed to context
|
|
* also prepare the protocol string used by the client
|
|
*/
|
|
static void _lws_make_protocols(void *p_obj, lws_callback_function *p_callback, PoolVector<String> p_names, _LWSRef **r_lws_ref) {
|
|
/* the input strings might go away after this call,
|
|
* we need to copy them. Will clear them when
|
|
* detroying the context */
|
|
int i;
|
|
int len = p_names.size();
|
|
size_t data_size = sizeof(struct LWSPeer::PeerData);
|
|
PoolVector<String>::Read pnr = p_names.read();
|
|
|
|
/*
|
|
* This is a reference connecting the object with lws
|
|
* keep track of status, mallocs, etc.
|
|
* Must survive as long the context
|
|
* Must be freed manually when context creation fails.
|
|
*/
|
|
_LWSRef *ref = _lws_create_ref(p_obj);
|
|
|
|
/* LWS protocol structs */
|
|
ref->lws_structs = (struct lws_protocols *)memalloc(sizeof(struct lws_protocols) * (len + 2));
|
|
|
|
CharString strings = p_names.join(",").ascii();
|
|
int str_len = strings.length();
|
|
|
|
/* Joined string of protocols, double the size: comma separated first, NULL separated last */
|
|
ref->lws_names = (char *)memalloc((str_len + 1) * 2); /* plus the terminator */
|
|
|
|
char *names_ptr = ref->lws_names;
|
|
struct lws_protocols *structs_ptr = ref->lws_structs;
|
|
|
|
copymem(names_ptr, strings.get_data(), str_len);
|
|
names_ptr[str_len] = '\0'; /* NULL terminator */
|
|
/* NULL terminated strings to be used in protocol structs */
|
|
copymem(&names_ptr[str_len + 1], strings.get_data(), str_len);
|
|
names_ptr[(str_len * 2) + 1] = '\0'; /* NULL terminator */
|
|
int pos = str_len + 1;
|
|
|
|
/* the first protocol is always http-only */
|
|
structs_ptr[0].name = "http-only";
|
|
structs_ptr[0].callback = p_callback;
|
|
structs_ptr[0].per_session_data_size = data_size;
|
|
structs_ptr[0].rx_buffer_size = 0;
|
|
/* add user defined protocols */
|
|
for (i = 0; i < len; i++) {
|
|
structs_ptr[i + 1].name = (const char *)&names_ptr[pos];
|
|
structs_ptr[i + 1].callback = p_callback;
|
|
structs_ptr[i + 1].per_session_data_size = data_size;
|
|
structs_ptr[i + 1].rx_buffer_size = 0;
|
|
pos += pnr[i].ascii().length() + 1;
|
|
names_ptr[pos - 1] = '\0';
|
|
}
|
|
/* add protocols terminator */
|
|
structs_ptr[len + 1].name = NULL;
|
|
structs_ptr[len + 1].callback = NULL;
|
|
structs_ptr[len + 1].per_session_data_size = 0;
|
|
structs_ptr[len + 1].rx_buffer_size = 0;
|
|
|
|
*r_lws_ref = ref;
|
|
}
|
|
|
|
/* clang-format off */
|
|
#define LWS_HELPER(CNAME) \
|
|
protected: \
|
|
struct _LWSRef *_lws_ref; \
|
|
struct lws_context *context; \
|
|
\
|
|
static int _lws_gd_callback(struct lws *wsi, enum lws_callback_reasons reason, void *user, void *in, size_t len) { \
|
|
\
|
|
if (wsi == NULL) { \
|
|
return 0; \
|
|
} \
|
|
\
|
|
struct _LWSRef *ref = (struct _LWSRef *)lws_context_user(lws_get_context(wsi)); \
|
|
if (!ref->is_valid) \
|
|
return 0; \
|
|
CNAME *helper = (CNAME *)ref->obj; \
|
|
return helper->_handle_cb(wsi, reason, user, in, len); \
|
|
} \
|
|
\
|
|
void invalidate_lws_ref() { \
|
|
if (_lws_ref != NULL) \
|
|
_lws_ref->is_valid = false; \
|
|
} \
|
|
\
|
|
void destroy_context() { \
|
|
if (_lws_destroy(context, _lws_ref)) { \
|
|
context = NULL; \
|
|
_lws_ref = NULL; \
|
|
} \
|
|
} \
|
|
\
|
|
public: \
|
|
virtual int _handle_cb(struct lws *wsi, enum lws_callback_reasons reason, void *user, void *in, size_t len); \
|
|
\
|
|
void _lws_poll() { \
|
|
ERR_FAIL_COND(context == NULL); \
|
|
\
|
|
if (::_lws_poll(context, _lws_ref)) { \
|
|
context = NULL; \
|
|
_lws_ref = NULL; \
|
|
} \
|
|
} \
|
|
\
|
|
protected:
|
|
|
|
/* clang-format on */
|
|
|
|
#endif // LWS_HELPER_H
|