75 lines
2.1 KiB
C
75 lines
2.1 KiB
C
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// Copyright 2012 The Chromium Authors
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#ifndef NET_DNS_DNS_SESSION_H_
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#define NET_DNS_DNS_SESSION_H_
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#include <stdint.h>
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#include "base/memory/raw_ptr.h"
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#include "base/memory/ref_counted.h"
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#include "base/memory/weak_ptr.h"
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#include "net/base/net_export.h"
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#include "net/base/rand_callback.h"
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#include "net/dns/dns_config.h"
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#include "net/dns/dns_udp_tracker.h"
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namespace net {
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class NetLog;
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// Session parameters and state shared between DnsTransactions for a specific
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// instance/version of a DnsConfig. Also may be used as a key handle for
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// per-session state stored elsewhere, e.g. in ResolveContext. A new DnsSession
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// should be created for each new DnsConfig for DnsTransactions to be based on
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// that new configuration.
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//
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// Ref-counted so that DnsTransactions can keep working in absence of
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// DnsClient or continue operating on the same session after DnsClient has moved
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// to a new DnsConfig/DnsSession.
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class NET_EXPORT_PRIVATE DnsSession : public base::RefCounted<DnsSession> {
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public:
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typedef base::RepeatingCallback<int()> RandCallback;
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DnsSession(const DnsConfig& config,
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const RandIntCallback& rand_int_callback,
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NetLog* net_log);
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DnsSession(const DnsSession&) = delete;
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DnsSession& operator=(const DnsSession&) = delete;
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const DnsConfig& config() const { return config_; }
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DnsUdpTracker* udp_tracker() { return &udp_tracker_; }
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NetLog* net_log() const { return net_log_; }
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// Return the next random query ID.
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uint16_t NextQueryId() const;
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base::WeakPtr<DnsSession> GetWeakPtr() {
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return weak_ptr_factory_.GetWeakPtr();
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}
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base::WeakPtr<const DnsSession> GetWeakPtr() const {
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return weak_ptr_factory_.GetWeakPtr();
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}
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void InvalidateWeakPtrsForTesting();
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private:
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friend class base::RefCounted<DnsSession>;
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~DnsSession();
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const DnsConfig config_;
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DnsUdpTracker udp_tracker_;
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RandCallback rand_callback_;
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raw_ptr<NetLog> net_log_;
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mutable base::WeakPtrFactory<DnsSession> weak_ptr_factory_{this};
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};
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} // namespace net
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#endif // NET_DNS_DNS_SESSION_H_
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