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319 lines
9.0 KiB
C++
319 lines
9.0 KiB
C++
/*************************************************************************/
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/* ip.cpp */
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/*************************************************************************/
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/* This file is part of: */
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/* GODOT ENGINE */
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/* https://godotengine.org */
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/*************************************************************************/
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/* Copyright (c) 2007-2019 Juan Linietsky, Ariel Manzur. */
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/* Copyright (c) 2014-2019 Godot Engine contributors (cf. AUTHORS.md) */
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/* */
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/* Permission is hereby granted, free of charge, to any person obtaining */
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/* a copy of this software and associated documentation files (the */
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/* "Software"), to deal in the Software without restriction, including */
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/* without limitation the rights to use, copy, modify, merge, publish, */
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/* distribute, sublicense, and/or sell copies of the Software, and to */
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/* permit persons to whom the Software is furnished to do so, subject to */
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/* the following conditions: */
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/* */
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/* The above copyright notice and this permission notice shall be */
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/* included in all copies or substantial portions of the Software. */
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/* */
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/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, */
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/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF */
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/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.*/
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/* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY */
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/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, */
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/* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE */
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/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */
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/*************************************************************************/
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#include "ip.h"
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#include "core/hash_map.h"
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#include "core/os/semaphore.h"
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#include "core/os/thread.h"
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VARIANT_ENUM_CAST(IP::ResolverStatus);
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/************* RESOLVER ******************/
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struct _IP_ResolverPrivate {
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struct QueueItem {
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volatile IP::ResolverStatus status;
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IP_Address response;
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String hostname;
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IP::Type type;
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void clear() {
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status = IP::RESOLVER_STATUS_NONE;
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response = IP_Address();
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type = IP::TYPE_NONE;
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hostname = "";
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};
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QueueItem() {
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clear();
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};
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};
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QueueItem queue[IP::RESOLVER_MAX_QUERIES];
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IP::ResolverID find_empty_id() const {
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for (int i = 0; i < IP::RESOLVER_MAX_QUERIES; i++) {
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if (queue[i].status == IP::RESOLVER_STATUS_NONE)
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return i;
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}
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return IP::RESOLVER_INVALID_ID;
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}
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Mutex *mutex;
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Semaphore *sem;
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Thread *thread;
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//Semaphore* semaphore;
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bool thread_abort;
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void resolve_queues() {
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for (int i = 0; i < IP::RESOLVER_MAX_QUERIES; i++) {
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if (queue[i].status != IP::RESOLVER_STATUS_WAITING)
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continue;
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queue[i].response = IP::get_singleton()->resolve_hostname(queue[i].hostname, queue[i].type);
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if (!queue[i].response.is_valid())
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queue[i].status = IP::RESOLVER_STATUS_ERROR;
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else
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queue[i].status = IP::RESOLVER_STATUS_DONE;
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}
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}
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static void _thread_function(void *self) {
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_IP_ResolverPrivate *ipr = (_IP_ResolverPrivate *)self;
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while (!ipr->thread_abort) {
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ipr->sem->wait();
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ipr->mutex->lock();
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ipr->resolve_queues();
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ipr->mutex->unlock();
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}
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}
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HashMap<String, IP_Address> cache;
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static String get_cache_key(String p_hostname, IP::Type p_type) {
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return itos(p_type) + p_hostname;
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}
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};
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IP_Address IP::resolve_hostname(const String &p_hostname, IP::Type p_type) {
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resolver->mutex->lock();
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String key = _IP_ResolverPrivate::get_cache_key(p_hostname, p_type);
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if (resolver->cache.has(key) && resolver->cache[key].is_valid()) {
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IP_Address res = resolver->cache[key];
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resolver->mutex->unlock();
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return res;
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}
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IP_Address res = _resolve_hostname(p_hostname, p_type);
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resolver->cache[key] = res;
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resolver->mutex->unlock();
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return res;
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}
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IP::ResolverID IP::resolve_hostname_queue_item(const String &p_hostname, IP::Type p_type) {
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resolver->mutex->lock();
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ResolverID id = resolver->find_empty_id();
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if (id == RESOLVER_INVALID_ID) {
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WARN_PRINT("Out of resolver queries");
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resolver->mutex->unlock();
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return id;
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}
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String key = _IP_ResolverPrivate::get_cache_key(p_hostname, p_type);
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resolver->queue[id].hostname = p_hostname;
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resolver->queue[id].type = p_type;
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if (resolver->cache.has(key) && resolver->cache[key].is_valid()) {
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resolver->queue[id].response = resolver->cache[key];
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resolver->queue[id].status = IP::RESOLVER_STATUS_DONE;
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} else {
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resolver->queue[id].response = IP_Address();
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resolver->queue[id].status = IP::RESOLVER_STATUS_WAITING;
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if (resolver->thread)
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resolver->sem->post();
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else
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resolver->resolve_queues();
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}
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resolver->mutex->unlock();
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return id;
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}
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IP::ResolverStatus IP::get_resolve_item_status(ResolverID p_id) const {
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ERR_FAIL_INDEX_V(p_id, IP::RESOLVER_MAX_QUERIES, IP::RESOLVER_STATUS_NONE);
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resolver->mutex->lock();
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if (resolver->queue[p_id].status == IP::RESOLVER_STATUS_NONE) {
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ERR_PRINT("Condition status == IP::RESOLVER_STATUS_NONE");
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resolver->mutex->unlock();
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return IP::RESOLVER_STATUS_NONE;
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}
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IP::ResolverStatus res = resolver->queue[p_id].status;
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resolver->mutex->unlock();
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return res;
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}
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IP_Address IP::get_resolve_item_address(ResolverID p_id) const {
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ERR_FAIL_INDEX_V(p_id, IP::RESOLVER_MAX_QUERIES, IP_Address());
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resolver->mutex->lock();
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if (resolver->queue[p_id].status != IP::RESOLVER_STATUS_DONE) {
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ERR_PRINTS("Resolve of '" + resolver->queue[p_id].hostname + "'' didn't complete yet.");
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resolver->mutex->unlock();
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return IP_Address();
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}
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IP_Address res = resolver->queue[p_id].response;
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resolver->mutex->unlock();
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return res;
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}
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void IP::erase_resolve_item(ResolverID p_id) {
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ERR_FAIL_INDEX(p_id, IP::RESOLVER_MAX_QUERIES);
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resolver->mutex->lock();
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resolver->queue[p_id].status = IP::RESOLVER_STATUS_NONE;
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resolver->mutex->unlock();
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}
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void IP::clear_cache(const String &p_hostname) {
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resolver->mutex->lock();
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if (p_hostname.empty()) {
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resolver->cache.clear();
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} else {
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resolver->cache.erase(_IP_ResolverPrivate::get_cache_key(p_hostname, IP::TYPE_NONE));
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resolver->cache.erase(_IP_ResolverPrivate::get_cache_key(p_hostname, IP::TYPE_IPV4));
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resolver->cache.erase(_IP_ResolverPrivate::get_cache_key(p_hostname, IP::TYPE_IPV6));
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resolver->cache.erase(_IP_ResolverPrivate::get_cache_key(p_hostname, IP::TYPE_ANY));
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}
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resolver->mutex->unlock();
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}
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Array IP::_get_local_addresses() const {
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Array addresses;
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List<IP_Address> ip_addresses;
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get_local_addresses(&ip_addresses);
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for (List<IP_Address>::Element *E = ip_addresses.front(); E; E = E->next()) {
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addresses.push_back(E->get());
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}
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return addresses;
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}
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void IP::_bind_methods() {
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ClassDB::bind_method(D_METHOD("resolve_hostname", "host", "ip_type"), &IP::resolve_hostname, DEFVAL(IP::TYPE_ANY));
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ClassDB::bind_method(D_METHOD("resolve_hostname_queue_item", "host", "ip_type"), &IP::resolve_hostname_queue_item, DEFVAL(IP::TYPE_ANY));
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ClassDB::bind_method(D_METHOD("get_resolve_item_status", "id"), &IP::get_resolve_item_status);
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ClassDB::bind_method(D_METHOD("get_resolve_item_address", "id"), &IP::get_resolve_item_address);
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ClassDB::bind_method(D_METHOD("erase_resolve_item", "id"), &IP::erase_resolve_item);
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ClassDB::bind_method(D_METHOD("get_local_addresses"), &IP::_get_local_addresses);
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ClassDB::bind_method(D_METHOD("clear_cache", "hostname"), &IP::clear_cache, DEFVAL(""));
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BIND_ENUM_CONSTANT(RESOLVER_STATUS_NONE);
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BIND_ENUM_CONSTANT(RESOLVER_STATUS_WAITING);
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BIND_ENUM_CONSTANT(RESOLVER_STATUS_DONE);
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BIND_ENUM_CONSTANT(RESOLVER_STATUS_ERROR);
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BIND_CONSTANT(RESOLVER_MAX_QUERIES);
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BIND_CONSTANT(RESOLVER_INVALID_ID);
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BIND_ENUM_CONSTANT(TYPE_NONE);
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BIND_ENUM_CONSTANT(TYPE_IPV4);
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BIND_ENUM_CONSTANT(TYPE_IPV6);
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BIND_ENUM_CONSTANT(TYPE_ANY);
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}
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IP *IP::singleton = NULL;
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IP *IP::get_singleton() {
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return singleton;
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}
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IP *(*IP::_create)() = NULL;
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IP *IP::create() {
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ERR_FAIL_COND_V(singleton, NULL);
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ERR_FAIL_COND_V(!_create, NULL);
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return _create();
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}
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IP::IP() {
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singleton = this;
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resolver = memnew(_IP_ResolverPrivate);
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resolver->sem = NULL;
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resolver->mutex = Mutex::create();
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#ifndef NO_THREADS
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resolver->sem = Semaphore::create();
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if (resolver->sem) {
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resolver->thread_abort = false;
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resolver->thread = Thread::create(_IP_ResolverPrivate::_thread_function, resolver);
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if (!resolver->thread)
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memdelete(resolver->sem); //wtf
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} else {
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resolver->thread = NULL;
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}
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#else
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resolver->sem = NULL;
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resolver->thread = NULL;
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#endif
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}
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IP::~IP() {
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#ifndef NO_THREADS
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if (resolver->thread) {
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resolver->thread_abort = true;
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resolver->sem->post();
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Thread::wait_to_finish(resolver->thread);
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memdelete(resolver->thread);
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memdelete(resolver->sem);
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}
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#endif
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memdelete(resolver->mutex);
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memdelete(resolver);
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}
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