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/*
* Copyright (c) 2021-2022, Ali Mohammad Pur <mpfard@serenityos.org>
* Copyright (c) 2022, the SerenityOS developers.
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#pragma once
#include <AK/Debug.h>
#include <AK/HashMap.h>
#include <AK/NonnullOwnPtrVector.h>
#include <AK/URL.h>
#include <AK/Vector.h>
#include <LibCore/ElapsedTimer.h>
#include <LibCore/EventLoop.h>
#include <LibCore/NetworkJob.h>
#include <LibCore/Timer.h>
#include <LibTLS/TLSv12.h>
namespace RequestServer {
enum class CacheLevel {
ResolveOnly,
CreateConnection,
};
}
namespace RequestServer::ConnectionCache {
template<typename Socket>
struct Connection {
struct JobData {
Function<void(Core::Stream::Socket&)> start {};
Function<void(Core::NetworkJob::Error)> fail {};
Function<Vector<TLS::Certificate>()> provide_client_certificates {};
template<typename T>
static JobData create(T& job)
{
// Clang-format _really_ messes up formatting this, so just format it manually.
// clang-format off
return JobData {
.start = [&job](auto& socket) {
job.start(socket);
},
.fail = [&job](auto error) {
job.fail(error);
},
.provide_client_certificates = [&job] {
if constexpr (requires { job.on_certificate_requested; }) {
if (job.on_certificate_requested)
return job.on_certificate_requested();
} else {
// "use" `job`, otherwise clang gets sad.
(void)job;
}
return Vector<TLS::Certificate> {};
},
};
// clang-format on
}
};
using QueueType = Vector<JobData>;
using SocketType = Socket;
NonnullOwnPtr<Core::Stream::BufferedSocket<Socket>> socket;
QueueType request_queue;
NonnullRefPtr<Core::Timer> removal_timer;
bool has_started { false };
URL current_url {};
Core::ElapsedTimer timer {};
JobData job_data {};
};
struct ConnectionKey {
String hostname;
u16 port { 0 };
bool operator==(ConnectionKey const&) const = default;
};
};
template<>
struct AK::Traits<RequestServer::ConnectionCache::ConnectionKey> : public AK::GenericTraits<RequestServer::ConnectionCache::ConnectionKey> {
static u32 hash(RequestServer::ConnectionCache::ConnectionKey const& key)
{
return pair_int_hash(key.hostname.hash(), key.port);
}
};
namespace RequestServer::ConnectionCache {
extern HashMap<ConnectionKey, NonnullOwnPtr<NonnullOwnPtrVector<Connection<Core::Stream::TCPSocket>>>> g_tcp_connection_cache;
extern HashMap<ConnectionKey, NonnullOwnPtr<NonnullOwnPtrVector<Connection<TLS::TLSv12>>>> g_tls_connection_cache;
void request_did_finish(URL const&, Core::Stream::Socket const*);
void dump_jobs();
constexpr static size_t MaxConcurrentConnectionsPerURL = 2;
constexpr static size_t ConnectionKeepAliveTimeMilliseconds = 10'000;
template<typename T>
ErrorOr<void> recreate_socket_if_needed(T& connection, URL const& url)
{
using SocketType = typename T::SocketType;
if (!connection.socket->is_open() || connection.socket->is_eof()) {
// Create another socket for the connection.
auto set_socket = [&](auto socket) -> ErrorOr<void> {
connection.socket = TRY(Core::Stream::BufferedSocket<SocketType>::create(move(socket)));
return {};
};
if constexpr (IsSame<TLS::TLSv12, SocketType>) {
TLS::Options options;
options.set_alert_handler([&connection](TLS::AlertDescription alert) {
Core::NetworkJob::Error reason;
if (alert == TLS::AlertDescription::HandshakeFailure)
reason = Core::NetworkJob::Error::ProtocolFailed;
else if (alert == TLS::AlertDescription::DecryptError)
reason = Core::NetworkJob::Error::ConnectionFailed;
else
reason = Core::NetworkJob::Error::TransmissionFailed;
if (connection.job_data.fail)
connection.job_data.fail(reason);
});
options.set_certificate_provider([&connection]() -> Vector<TLS::Certificate> {
if (connection.job_data.provide_client_certificates)
return connection.job_data.provide_client_certificates();
return {};
});
TRY(set_socket(TRY(SocketType::connect(url.host(), url.port_or_default(), move(options)))));
} else {
TRY(set_socket(TRY(SocketType::connect(url.host(), url.port_or_default()))));
}
dbgln_if(REQUESTSERVER_DEBUG, "Creating a new socket for {} -> {}", url, connection.socket);
}
return {};
}
decltype(auto) get_or_create_connection(auto& cache, URL const& url, auto& job)
{
using CacheEntryType = RemoveCVReference<decltype(*cache.begin()->value)>;
auto& sockets_for_url = *cache.ensure({ url.host(), url.port_or_default() }, [] { return make<CacheEntryType>(); });
using ReturnType = decltype(&sockets_for_url[0]);
auto it = sockets_for_url.find_if([](auto& connection) { return connection->request_queue.is_empty(); });
auto did_add_new_connection = false;
auto failed_to_find_a_socket = it.is_end();
if (failed_to_find_a_socket && sockets_for_url.size() < ConnectionCache::MaxConcurrentConnectionsPerURL) {
using ConnectionType = RemoveCVReference<decltype(cache.begin()->value->at(0))>;
auto connection_result = ConnectionType::SocketType::connect(url.host(), url.port_or_default());
if (connection_result.is_error()) {
dbgln("ConnectionCache: Connection to {} failed: {}", url, connection_result.error());
Core::deferred_invoke([&job] {
job.fail(Core::NetworkJob::Error::ConnectionFailed);
});
return ReturnType { nullptr };
}
auto socket_result = Core::Stream::BufferedSocket<typename ConnectionType::SocketType>::create(connection_result.release_value());
if (socket_result.is_error()) {
dbgln("ConnectionCache: Failed to make a buffered socket for {}: {}", url, socket_result.error());
Core::deferred_invoke([&job] {
job.fail(Core::NetworkJob::Error::ConnectionFailed);
});
return ReturnType { nullptr };
}
sockets_for_url.append(make<ConnectionType>(
socket_result.release_value(),
typename ConnectionType::QueueType {},
Core::Timer::create_single_shot(ConnectionKeepAliveTimeMilliseconds, nullptr)));
did_add_new_connection = true;
}
size_t index;
if (failed_to_find_a_socket) {
if (did_add_new_connection) {
index = sockets_for_url.size() - 1;
} else {
// Find the least backed-up connection (based on how many entries are in their request queue).
index = 0;
auto min_queue_size = (size_t)-1;
for (auto it = sockets_for_url.begin(); it != sockets_for_url.end(); ++it) {
if (auto queue_size = it->request_queue.size(); min_queue_size > queue_size) {
index = it.index();
min_queue_size = queue_size;
}
}
}
} else {
index = it.index();
}
if (sockets_for_url.is_empty()) {
Core::deferred_invoke([&job] {
job.fail(Core::NetworkJob::Error::ConnectionFailed);
});
return ReturnType { nullptr };
}
auto& connection = sockets_for_url[index];
if (!connection.has_started) {
if (auto result = recreate_socket_if_needed(connection, url); result.is_error()) {
dbgln("ConnectionCache: request failed to start, failed to make a socket: {}", result.error());
Core::deferred_invoke([&job] {
job.fail(Core::NetworkJob::Error::ConnectionFailed);
});
return ReturnType { nullptr };
}
dbgln_if(REQUESTSERVER_DEBUG, "Immediately start request for url {} in {} - {}", url, &connection, connection.socket);
connection.has_started = true;
connection.removal_timer->stop();
connection.timer.start();
connection.current_url = url;
connection.job_data = decltype(connection.job_data)::create(job);
connection.socket->set_notifications_enabled(true);
connection.job_data.start(*connection.socket);
} else {
dbgln_if(REQUESTSERVER_DEBUG, "Enqueue request for URL {} in {} - {}", url, &connection, connection.socket);
connection.request_queue.append(decltype(connection.job_data)::create(job));
}
return &connection;
}
}
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