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::tryRegisterRequest(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 if (m_inflightKeepaliveBytes + bodySize > maxInflightKeepaliveBytes)
49 return false;
50
51 registerRequest(resource);
52 return true;
53}
54
55void KeepaliveRequestTracker::registerRequest(CachedResource& resource)
56{
57 ASSERT(resource.options().keepAlive);
58 auto* body = resource.resourceRequest().httpBody();
59 if (!body)
60 return;
61 ASSERT(!m_inflightKeepaliveRequests.contains(&resource));
62 m_inflightKeepaliveRequests.append(&resource);
63 m_inflightKeepaliveBytes += body->lengthInBytes();
64 ASSERT(m_inflightKeepaliveBytes <= maxInflightKeepaliveBytes);
65
66 resource.addClient(*this);
67}
68
69void KeepaliveRequestTracker::responseReceived(CachedResource& resource, const ResourceResponse&, CompletionHandler<void()>&& completionHandler)
70{
71 // Per Fetch specification, allocated quota should be returned before the promise is resolved,
72 // which is when the response is received.
73 unregisterRequest(resource);
74
75 if (completionHandler)
76 completionHandler();
77}
78
79void KeepaliveRequestTracker::notifyFinished(CachedResource& resource)
80{
81 unregisterRequest(resource);
82}
83
84void KeepaliveRequestTracker::unregisterRequest(CachedResource& resource)
85{
86 ASSERT(resource.options().keepAlive);
87 resource.removeClient(*this);
88 bool wasRemoved = m_inflightKeepaliveRequests.removeFirst(&resource);
89 ASSERT_UNUSED(wasRemoved, wasRemoved);
90 m_inflightKeepaliveBytes -= resource.resourceRequest().httpBody()->lengthInBytes();
91 ASSERT(m_inflightKeepaliveBytes <= maxInflightKeepaliveBytes);
92}
93
94}
95