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// Copyright (c) 2012 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/dns/dns_client.h"
#include <utility>
#include "base/bind.h"
#include "base/memory/ptr_util.h"
#include "base/rand_util.h"
#include "net/dns/address_sorter.h"
#include "net/dns/dns_config_service.h"
#include "net/dns/dns_session.h"
#include "net/dns/dns_socket_pool.h"
#include "net/dns/dns_transaction.h"
#include "net/socket/client_socket_factory.h"
namespace base {
class Value;
}
namespace net {
namespace {
class DnsClientImpl : public DnsClient {
public:
DnsClientImpl(NetLog* net_log,
ClientSocketFactory* socket_factory,
const RandIntCallback& rand_int_callback)
: address_sorter_(AddressSorter::CreateAddressSorter()),
net_log_(net_log),
socket_factory_(socket_factory),
rand_int_callback_(rand_int_callback) {}
void SetConfig(const DnsConfig& config) override {
factory_.reset();
session_ = nullptr;
if (config.IsValid() && !config.unhandled_options) {
std::unique_ptr<DnsSocketPool> socket_pool(
config.randomize_ports
? DnsSocketPool::CreateDefault(socket_factory_,
rand_int_callback_)
: DnsSocketPool::CreateNull(socket_factory_, rand_int_callback_));
session_ = new DnsSession(config, std::move(socket_pool),
rand_int_callback_, net_log_);
factory_ = DnsTransactionFactory::CreateFactory(session_.get());
}
}
const DnsConfig* GetConfig() const override {
return session_.get() ? &session_->config() : NULL;
}
DnsTransactionFactory* GetTransactionFactory() override {
return session_.get() ? factory_.get() : NULL;
}
AddressSorter* GetAddressSorter() override { return address_sorter_.get(); }
std::unique_ptr<const base::Value> GetPersistentData() const override {
if (!session_)
return std::unique_ptr<const base::Value>();
return session_->GetPersistentData();
}
void ApplyPersistentData(const base::Value& data) override {
if (!session_)
return;
session_->ApplyPersistentData(data);
}
private:
scoped_refptr<DnsSession> session_;
std::unique_ptr<DnsTransactionFactory> factory_;
std::unique_ptr<AddressSorter> address_sorter_;
NetLog* net_log_;
ClientSocketFactory* socket_factory_;
const RandIntCallback rand_int_callback_;
DISALLOW_COPY_AND_ASSIGN(DnsClientImpl);
};
} // namespace
// static
std::unique_ptr<DnsClient> DnsClient::CreateClient(NetLog* net_log) {
return base::WrapUnique(
new DnsClientImpl(net_log, ClientSocketFactory::GetDefaultFactory(),
base::Bind(&base::RandInt)));
}
// static
std::unique_ptr<DnsClient> DnsClient::CreateClientForTesting(
NetLog* net_log,
ClientSocketFactory* socket_factory,
const RandIntCallback& rand_int_callback) {
return base::WrapUnique(
new DnsClientImpl(net_log, socket_factory, rand_int_callback));
}
} // namespace net
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