1/*
2 * Copyright (C) 2017 Apple Inc. All rights reserved.
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
6 * are met:
7 * 1. Redistributions of source code must retain the above copyright
8 * notice, this list of conditions and the following disclaimer.
9 * 2. Redistributions in binary form must reproduce the above copyright
10 * notice, this list of conditions and the following disclaimer in the
11 * documentation and/or other materials provided with the distribution.
12 *
13 * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
14 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
15 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
16 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
17 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
18 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
19 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
20 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
21 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
22 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
23 * THE POSSIBILITY OF SUCH DAMAGE.
24 */
25
26#include "config.h"
27#include "KeepaliveRequestTracker.h"
28
29namespace WebCore {
30
31const uint64_t maxInflightKeepaliveBytes { 65536 }; // 64 kibibytes as per Fetch specification.
32
33KeepaliveRequestTracker::~KeepaliveRequestTracker()
34{
35 auto inflightRequests = WTFMove(m_inflightKeepaliveRequests);
36 for (auto& resource : inflightRequests)
37 resource->removeClient(*this);
38}
39
40bool KeepaliveRequestTracker::canLoadRequest(CachedResource& resource)
41{
42 ASSERT(resource.options().keepAlive);
43 auto* body = resource.resourceRequest().httpBody();
44 if (!body)
45 return true;
46
47 uint64_t bodySize = body->lengthInBytes();
48 return m_inflightKeepaliveBytes + bodySize <= maxInflightKeepaliveBytes;
49}
50
51void KeepaliveRequestTracker::registerRequest(CachedResource& resource)
52{
53 ASSERT(resource.options().keepAlive);
54 auto* body = resource.resourceRequest().httpBody();
55 if (!body)
56 return;
57 ASSERT(!m_inflightKeepaliveRequests.contains(&resource));
58 m_inflightKeepaliveRequests.append(&resource);
59 m_inflightKeepaliveBytes += body->lengthInBytes();
60 ASSERT(m_inflightKeepaliveBytes <= maxInflightKeepaliveBytes);
61
62 resource.addClient(*this);
63}
64
65void KeepaliveRequestTracker::responseReceived(CachedResource& resource, const ResourceResponse&)
66{
67 // Per Fetch specification, allocated quota should be returned before the promise is resolved,
68 // which is when the response is received.
69 unregisterRequest(resource);
70}
71
72void KeepaliveRequestTracker::notifyFinished(CachedResource& resource)
73{
74 unregisterRequest(resource);
75}
76
77void KeepaliveRequestTracker::unregisterRequest(CachedResource& resource)
78{
79 ASSERT(resource.options().keepAlive);
80 resource.removeClient(*this);
81 bool wasRemoved = m_inflightKeepaliveRequests.removeFirst(&resource);
82 ASSERT_UNUSED(wasRemoved, wasRemoved);
83 m_inflightKeepaliveBytes -= resource.resourceRequest().httpBody()->lengthInBytes();
84 ASSERT(m_inflightKeepaliveBytes <= maxInflightKeepaliveBytes);
85}
86
87}