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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.
#ifndef NET_DNS_DNS_SESSION_H_
#define NET_DNS_DNS_SESSION_H_
#include <stdint.h>
#include <memory>
#include "base/macros.h"
#include "base/memory/ref_counted.h"
#include "base/memory/weak_ptr.h"
#include "net/base/net_export.h"
#include "net/base/rand_callback.h"
#include "net/dns/dns_config.h"
#include "net/dns/dns_udp_tracker.h"
namespace net {
class DnsSocketAllocator;
class NetLog;
// Session parameters and state shared between DnsTransactions for a specific
// instance/version of a DnsConfig. Also may be used as a key handle for
// per-session state stored elsewhere, e.g. in ResolveContext. A new DnsSession
// should be created for each new DnsConfig for DnsTransactions to be based on
// that new configuration.
//
// Ref-counted so that DnsTransactions can keep working in absence of
// DnsClient or continue operating on the same session after DnsClient has moved
// to a new DnsConfig/DnsSession.
class NET_EXPORT_PRIVATE DnsSession : public base::RefCounted<DnsSession> {
public:
typedef base::RepeatingCallback<int()> RandCallback;
DnsSession(const DnsConfig& config,
std::unique_ptr<DnsSocketAllocator> socket_allocator,
const RandIntCallback& rand_int_callback,
NetLog* net_log);
const DnsConfig& config() const { return config_; }
DnsSocketAllocator* socket_allocator() { return socket_allocator_.get(); }
DnsUdpTracker* udp_tracker() { return &udp_tracker_; }
NetLog* net_log() const { return net_log_; }
// Return the next random query ID.
uint16_t NextQueryId() const;
base::WeakPtr<DnsSession> GetWeakPtr() {
return weak_ptr_factory_.GetWeakPtr();
}
base::WeakPtr<const DnsSession> GetWeakPtr() const {
return weak_ptr_factory_.GetWeakPtr();
}
void InvalidateWeakPtrsForTesting();
private:
friend class base::RefCounted<DnsSession>;
~DnsSession();
const DnsConfig config_;
std::unique_ptr<DnsSocketAllocator> socket_allocator_;
DnsUdpTracker udp_tracker_;
RandCallback rand_callback_;
NetLog* net_log_;
mutable base::WeakPtrFactory<DnsSession> weak_ptr_factory_{this};
DISALLOW_COPY_AND_ASSIGN(DnsSession);
};
} // namespace net
#endif // NET_DNS_DNS_SESSION_H_
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