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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 "base/at_exit.h"
#include "base/location.h"
#include "base/memory/weak_ptr.h"
#include "base/single_thread_task_runner.h"
#include "base/thread_task_runner_handle.h"
#include "base/threading/simple_thread.h"
#include "net/base/host_port_pair.h"
#include "net/base/net_errors.h"
#include "net/dns/host_resolver_impl.h"
#include "net/dns/single_request_host_resolver.h"
namespace net {
namespace tools {
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(int rv);
AddressList* addresses_;
std::string host_;
int rv_;
base::WeakPtrFactory<ResolverThread> weak_factory_;
DISALLOW_COPY_AND_ASSIGN(ResolverThread);
};
ResolverThread::ResolverThread()
: SimpleThread("resolver_thread"),
rv_(ERR_UNEXPECTED),
weak_factory_(this) {}
ResolverThread::~ResolverThread() {}
void ResolverThread::Run() {
base::MessageLoopForIO loop;
net::NetLog net_log;
net::HostResolver::Options options;
options.max_concurrent_resolves = 6;
options.max_retry_attempts = 3u;
scoped_ptr<net::HostResolverImpl> resolver_impl(
new net::HostResolverImpl(options, &net_log));
SingleRequestHostResolver resolver(resolver_impl.get());
HostPortPair host_port_pair(host_, 80);
rv_ = resolver.Resolve(
HostResolver::RequestInfo(host_port_pair), DEFAULT_PRIORITY,
addresses_,
base::Bind(&ResolverThread::OnResolutionComplete,
weak_factory_.GetWeakPtr()),
BoundNetLog());
if (rv_ != ERR_IO_PENDING)
return;
// Run the mesage loop until OnResolutionComplete quits it.
base::MessageLoop::current()->Run();
}
int ResolverThread::Resolve(const std::string& host, AddressList* addresses) {
host_ = host;
addresses_ = addresses;
this->Start();
this->Join();
return rv_;
}
void ResolverThread::OnResolutionComplete(int rv) {
rv_ = rv;
base::ThreadTaskRunnerHandle::Get()->PostTask(
FROM_HERE, base::MessageLoop::QuitClosure());
}
} // namespace
// static
int SynchronousHostResolver::Resolve(const std::string& host,
AddressList* addresses) {
ResolverThread resolver;
return resolver.Resolve(host, addresses);
}
} // namespace tools
} // namespace net
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