godot/core/io/ip.cpp
2017-08-20 22:07:43 +02:00

317 lines
8.9 KiB
C++

/*************************************************************************/
/* ip.cpp */
/*************************************************************************/
/* This file is part of: */
/* GODOT ENGINE */
/* http://www.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. */
/*************************************************************************/
#include "ip.h"
#include "hash_map.h"
#include "os/semaphore.h"
#include "os/thread.h"
VARIANT_ENUM_CAST(IP::ResolverStatus);
/************* RESOLVER ******************/
struct _IP_ResolverPrivate {
struct QueueItem {
volatile IP::ResolverStatus status;
IP_Address response;
String hostname;
IP::Type type;
void clear() {
status = IP::RESOLVER_STATUS_NONE;
response = IP_Address();
type = IP::TYPE_NONE;
hostname = "";
};
QueueItem() {
clear();
};
};
QueueItem queue[IP::RESOLVER_MAX_QUERIES];
IP::ResolverID find_empty_id() const {
for (int i = 0; i < IP::RESOLVER_MAX_QUERIES; i++) {
if (queue[i].status == IP::RESOLVER_STATUS_NONE)
return i;
}
return IP::RESOLVER_INVALID_ID;
}
Mutex *mutex;
Semaphore *sem;
Thread *thread;
//Semaphore* semaphore;
bool thread_abort;
void resolve_queues() {
for (int i = 0; i < IP::RESOLVER_MAX_QUERIES; i++) {
if (queue[i].status != IP::RESOLVER_STATUS_WAITING)
continue;
queue[i].response = IP::get_singleton()->resolve_hostname(queue[i].hostname, queue[i].type);
if (!queue[i].response.is_valid())
queue[i].status = IP::RESOLVER_STATUS_ERROR;
else
queue[i].status = IP::RESOLVER_STATUS_DONE;
}
}
static void _thread_function(void *self) {
_IP_ResolverPrivate *ipr = (_IP_ResolverPrivate *)self;
while (!ipr->thread_abort) {
ipr->sem->wait();
ipr->mutex->lock();
ipr->resolve_queues();
ipr->mutex->unlock();
}
}
HashMap<String, IP_Address> cache;
static String get_cache_key(String p_hostname, IP::Type p_type) {
return itos(p_type) + p_hostname;
}
};
IP_Address IP::resolve_hostname(const String &p_hostname, IP::Type p_type) {
resolver->mutex->lock();
String key = _IP_ResolverPrivate::get_cache_key(p_hostname, p_type);
if (resolver->cache.has(key)) {
IP_Address res = resolver->cache[key];
resolver->mutex->unlock();
return res;
}
IP_Address res = _resolve_hostname(p_hostname, p_type);
resolver->cache[key] = res;
resolver->mutex->unlock();
return res;
}
IP::ResolverID IP::resolve_hostname_queue_item(const String &p_hostname, IP::Type p_type) {
resolver->mutex->lock();
ResolverID id = resolver->find_empty_id();
if (id == RESOLVER_INVALID_ID) {
WARN_PRINT("Out of resolver queries");
resolver->mutex->unlock();
return id;
}
String key = _IP_ResolverPrivate::get_cache_key(p_hostname, p_type);
resolver->queue[id].hostname = p_hostname;
resolver->queue[id].type = p_type;
if (resolver->cache.has(key)) {
resolver->queue[id].response = resolver->cache[key];
resolver->queue[id].status = IP::RESOLVER_STATUS_DONE;
} else {
resolver->queue[id].response = IP_Address();
resolver->queue[id].status = IP::RESOLVER_STATUS_WAITING;
if (resolver->thread)
resolver->sem->post();
else
resolver->resolve_queues();
}
resolver->mutex->unlock();
return id;
}
IP::ResolverStatus IP::get_resolve_item_status(ResolverID p_id) const {
ERR_FAIL_INDEX_V(p_id, IP::RESOLVER_MAX_QUERIES, IP::RESOLVER_STATUS_NONE);
resolver->mutex->lock();
if (resolver->queue[p_id].status == IP::RESOLVER_STATUS_NONE) {
ERR_PRINT("Condition status == IP::RESOLVER_STATUS_NONE");
resolver->mutex->unlock();
return IP::RESOLVER_STATUS_NONE;
}
IP::ResolverStatus res = resolver->queue[p_id].status;
resolver->mutex->unlock();
return res;
}
IP_Address IP::get_resolve_item_address(ResolverID p_id) const {
ERR_FAIL_INDEX_V(p_id, IP::RESOLVER_MAX_QUERIES, IP_Address());
resolver->mutex->lock();
if (resolver->queue[p_id].status != IP::RESOLVER_STATUS_DONE) {
ERR_PRINTS("Resolve of '" + resolver->queue[p_id].hostname + "'' didn't complete yet.");
resolver->mutex->unlock();
return IP_Address();
}
IP_Address res = resolver->queue[p_id].response;
resolver->mutex->unlock();
return res;
}
void IP::erase_resolve_item(ResolverID p_id) {
ERR_FAIL_INDEX(p_id, IP::RESOLVER_MAX_QUERIES);
resolver->mutex->lock();
resolver->queue[p_id].status = IP::RESOLVER_STATUS_NONE;
resolver->mutex->unlock();
}
void IP::clear_cache(const String &p_hostname) {
resolver->mutex->lock();
if (p_hostname.empty()) {
resolver->cache.clear();
} else {
resolver->cache.erase(_IP_ResolverPrivate::get_cache_key(p_hostname, IP::TYPE_NONE));
resolver->cache.erase(_IP_ResolverPrivate::get_cache_key(p_hostname, IP::TYPE_IPV4));
resolver->cache.erase(_IP_ResolverPrivate::get_cache_key(p_hostname, IP::TYPE_IPV6));
resolver->cache.erase(_IP_ResolverPrivate::get_cache_key(p_hostname, IP::TYPE_ANY));
}
resolver->mutex->unlock();
}
Array IP::_get_local_addresses() const {
Array addresses;
List<IP_Address> ip_addresses;
get_local_addresses(&ip_addresses);
for (List<IP_Address>::Element *E = ip_addresses.front(); E; E = E->next()) {
addresses.push_back(E->get());
}
return addresses;
}
void IP::_bind_methods() {
ClassDB::bind_method(D_METHOD("resolve_hostname", "host", "ip_type"), &IP::resolve_hostname, DEFVAL(IP::TYPE_ANY));
ClassDB::bind_method(D_METHOD("resolve_hostname_queue_item", "host", "ip_type"), &IP::resolve_hostname_queue_item, DEFVAL(IP::TYPE_ANY));
ClassDB::bind_method(D_METHOD("get_resolve_item_status", "id"), &IP::get_resolve_item_status);
ClassDB::bind_method(D_METHOD("get_resolve_item_address", "id"), &IP::get_resolve_item_address);
ClassDB::bind_method(D_METHOD("erase_resolve_item", "id"), &IP::erase_resolve_item);
ClassDB::bind_method(D_METHOD("get_local_addresses"), &IP::_get_local_addresses);
ClassDB::bind_method(D_METHOD("clear_cache", "hostname"), &IP::clear_cache, DEFVAL(""));
BIND_ENUM_CONSTANT(RESOLVER_STATUS_NONE);
BIND_ENUM_CONSTANT(RESOLVER_STATUS_WAITING);
BIND_ENUM_CONSTANT(RESOLVER_STATUS_DONE);
BIND_ENUM_CONSTANT(RESOLVER_STATUS_ERROR);
BIND_CONSTANT(RESOLVER_MAX_QUERIES);
BIND_CONSTANT(RESOLVER_INVALID_ID);
BIND_ENUM_CONSTANT(TYPE_NONE);
BIND_ENUM_CONSTANT(TYPE_IPV4);
BIND_ENUM_CONSTANT(TYPE_IPV6);
BIND_ENUM_CONSTANT(TYPE_ANY);
}
IP *IP::singleton = NULL;
IP *IP::get_singleton() {
return singleton;
}
IP *(*IP::_create)() = NULL;
IP *IP::create() {
ERR_FAIL_COND_V(singleton, NULL);
ERR_FAIL_COND_V(!_create, NULL);
return _create();
}
IP::IP() {
singleton = this;
resolver = memnew(_IP_ResolverPrivate);
resolver->sem = NULL;
resolver->mutex = Mutex::create();
#ifndef NO_THREADS
resolver->sem = Semaphore::create();
if (resolver->sem) {
resolver->thread_abort = false;
resolver->thread = Thread::create(_IP_ResolverPrivate::_thread_function, resolver);
if (!resolver->thread)
memdelete(resolver->sem); //wtf
} else {
resolver->thread = NULL;
}
#else
resolver->sem = NULL;
resolver->thread = NULL;
#endif
}
IP::~IP() {
#ifndef NO_THREADS
if (resolver->thread) {
resolver->thread_abort = true;
resolver->sem->post();
Thread::wait_to_finish(resolver->thread);
memdelete(resolver->thread);
memdelete(resolver->sem);
}
#endif
memdelete(resolver->mutex);
memdelete(resolver);
}