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 "Timer.h"
31#include <atomic>
32#include <wtf/Forward.h>
33#include <wtf/HashSet.h>
34#include <wtf/text/StringHash.h>
35
36namespace WebCore {
37
38class DNSResolveQueue {
39    friend NeverDestroyed<DNSResolveQueue>;
40
41public:
42    static DNSResolveQueue& shared();
43
44    void add(const String& hostname);
45    void decrementRequestCount()
46    {
47        --m_requestsInFlight;
48    }
49
50private:
51    DNSResolveQueue();
52
53    bool isUsingProxy();
54
55    bool platformProxyIsEnabledInSystemPreferences();
56    void platformResolve(const String&);
57
58    void timerFired(Timer<DNSResolveQueue>&);
59
60    Timer<DNSResolveQueue> m_timer;
61
62    HashSet<String> m_names;
63    std::atomic<int> m_requestsInFlight;
64    bool m_cachedProxyEnabledStatus;
65    double m_lastProxyEnabledStatusCheckTime;
66};
67
68}
69
70#endif // DNSResolveQueue_h
71