1/*
2 * Copyright (C) 2009 Apple Inc. All Rights Reserved.
3 * Copyright (C) 2012 Igalia S.L.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
15 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
17 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
18 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
19 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
20 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
21 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
22 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
23 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
24 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
25 */
26
27#ifndef DNSResolveQueue_h
28#define DNSResolveQueue_h
29
30#include "DNS.h"
31#include "Timer.h"
32#include <atomic>
33#include <wtf/Forward.h>
34#include <wtf/HashSet.h>
35#include <wtf/text/StringHash.h>
36
37namespace WebCore {
38
39class DNSResolveQueue {
40 friend NeverDestroyed<DNSResolveQueue>;
41
42public:
43 DNSResolveQueue();
44 virtual ~DNSResolveQueue() = default;
45
46 static DNSResolveQueue& singleton();
47
48 virtual void resolve(const String& hostname, uint64_t identifier, DNSCompletionHandler&&) = 0;
49 virtual void stopResolve(uint64_t identifier) = 0;
50 void add(const String& hostname);
51 void decrementRequestCount()
52 {
53 --m_requestsInFlight;
54 }
55
56protected:
57 bool isUsingProxy();
58
59 bool m_isUsingProxy { true };
60
61private:
62 virtual void updateIsUsingProxy() = 0;
63 virtual void platformResolve(const String&) = 0;
64 void timerFired();
65
66 Timer m_timer;
67
68 HashSet<String> m_names;
69 std::atomic<int> m_requestsInFlight;
70 MonotonicTime m_lastProxyEnabledStatusCheckTime;
71};
72
73}
74
75#endif // DNSResolveQueue_h
76