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// Copyright (c) 2015 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "net/tools/quic/synchronous_host_resolver.h"
#include <memory>
#include <utility>
#include "base/at_exit.h"
#include "base/bind.h"
#include "base/location.h"
#include "base/macros.h"
#include "base/memory/weak_ptr.h"
#include "base/message_loop/message_pump_type.h"
#include "base/optional.h"
#include "base/run_loop.h"
#include "base/single_thread_task_runner.h"
#include "base/task/single_thread_task_executor.h"
#include "base/threading/simple_thread.h"
#include "base/threading/thread_task_runner_handle.h"
#include "net/base/host_port_pair.h"
#include "net/base/net_errors.h"
#include "net/base/network_isolation_key.h"
#include "net/dns/host_resolver.h"
#include "net/log/net_log.h"
#include "net/log/net_log_with_source.h"
namespace net {
namespace {
class ResolverThread : public base::SimpleThread {
public:
ResolverThread();
~ResolverThread() override;
// Called on the main thread.
int Resolve(const std::string& host, AddressList* addresses);
// SimpleThread methods:
void Run() override;
private:
void OnResolutionComplete(base::OnceClosure on_done, int rv);
AddressList* addresses_;
std::string host_;
int rv_;
DISALLOW_COPY_AND_ASSIGN(ResolverThread);
};
ResolverThread::ResolverThread()
: SimpleThread("resolver_thread"), rv_(ERR_UNEXPECTED) {}
ResolverThread::~ResolverThread() = default;
void ResolverThread::Run() {
base::SingleThreadTaskExecutor io_task_executor(base::MessagePumpType::IO);
net::HostResolver::ManagerOptions options;
options.max_concurrent_resolves = 6;
options.max_system_retry_attempts = 3u;
std::unique_ptr<net::HostResolver> resolver =
net::HostResolver::CreateStandaloneResolver(NetLog::Get(), options);
HostPortPair host_port_pair(host_, 80);
// No need to use a NetworkIsolationKey here, since this is an external tool
// not used by net/ consumers.
std::unique_ptr<net::HostResolver::ResolveHostRequest> request =
resolver->CreateRequest(host_port_pair, NetworkIsolationKey(),
NetLogWithSource(), base::nullopt);
base::RunLoop run_loop;
rv_ = request->Start(base::BindOnce(&ResolverThread::OnResolutionComplete,
base::Unretained(this),
run_loop.QuitClosure()));
if (rv_ == ERR_IO_PENDING) {
// Run the message loop until OnResolutionComplete quits it.
run_loop.Run();
}
if (rv_ == OK) {
*addresses_ = request->GetAddressResults().value();
}
}
int ResolverThread::Resolve(const std::string& host, AddressList* addresses) {
host_ = host;
addresses_ = addresses;
this->Start();
this->Join();
return rv_;
}
void ResolverThread::OnResolutionComplete(base::OnceClosure on_done, int rv) {
rv_ = rv;
std::move(on_done).Run();
}
} // namespace
// static
int SynchronousHostResolver::Resolve(const std::string& host,
AddressList* addresses) {
ResolverThread resolver;
return resolver.Resolve(host, addresses);
}
} // namespace net
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