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/*
* Copyright (C) 2015 Apple Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
* THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "config.h"
#include "NetworkCacheBlobStorage.h"
#if ENABLE(NETWORK_CACHE)
#include "Logging.h"
#include "NetworkCacheFileSystem.h"
#include <WebCore/FileSystem.h>
#include <fcntl.h>
#include <sys/mman.h>
#include <sys/stat.h>
#include <wtf/RunLoop.h>
#include <wtf/SHA1.h>
namespace WebKit {
namespace NetworkCache {
BlobStorage::BlobStorage(const String& blobDirectoryPath, Salt salt)
: m_blobDirectoryPath(blobDirectoryPath)
, m_salt(salt)
{
}
String BlobStorage::blobDirectoryPath() const
{
return m_blobDirectoryPath.isolatedCopy();
}
void BlobStorage::synchronize()
{
ASSERT(!RunLoop::isMain());
WebCore::makeAllDirectories(blobDirectoryPath());
m_approximateSize = 0;
auto blobDirectory = blobDirectoryPath();
traverseDirectory(blobDirectory, [this, &blobDirectory](const String& name, DirectoryEntryType type) {
if (type != DirectoryEntryType::File)
return;
auto path = WebCore::pathByAppendingComponent(blobDirectory, name);
auto filePath = WebCore::fileSystemRepresentation(path);
struct stat stat;
::stat(filePath.data(), &stat);
// No clients left for this blob.
if (stat.st_nlink == 1)
unlink(filePath.data());
else
m_approximateSize += stat.st_size;
});
LOG(NetworkCacheStorage, "(NetworkProcess) blob synchronization completed approximateSize=%zu", approximateSize());
}
String BlobStorage::blobPathForHash(const SHA1::Digest& hash) const
{
auto hashAsString = SHA1::hexDigest(hash);
return WebCore::pathByAppendingComponent(blobDirectoryPath(), String::fromUTF8(hashAsString));
}
BlobStorage::Blob BlobStorage::add(const String& path, const Data& data)
{
ASSERT(!RunLoop::isMain());
auto hash = computeSHA1(data, m_salt);
if (data.isEmpty())
return { data, hash };
auto blobPath = WebCore::fileSystemRepresentation(blobPathForHash(hash));
auto linkPath = WebCore::fileSystemRepresentation(path);
unlink(linkPath.data());
bool blobExists = access(blobPath.data(), F_OK) != -1;
if (blobExists) {
auto existingData = mapFile(blobPath.data());
if (bytesEqual(existingData, data)) {
if (link(blobPath.data(), linkPath.data()) == -1)
WTFLogAlways("Failed to create hard link from %s to %s", blobPath.data(), linkPath.data());
return { existingData, hash };
}
unlink(blobPath.data());
}
auto mappedData = data.mapToFile(blobPath.data());
if (mappedData.isNull())
return { };
if (link(blobPath.data(), linkPath.data()) == -1)
WTFLogAlways("Failed to create hard link from %s to %s", blobPath.data(), linkPath.data());
m_approximateSize += mappedData.size();
return { mappedData, hash };
}
BlobStorage::Blob BlobStorage::get(const String& path)
{
ASSERT(!RunLoop::isMain());
auto linkPath = WebCore::fileSystemRepresentation(path);
auto data = mapFile(linkPath.data());
return { data, computeSHA1(data, m_salt) };
}
void BlobStorage::remove(const String& path)
{
ASSERT(!RunLoop::isMain());
auto linkPath = WebCore::fileSystemRepresentation(path);
unlink(linkPath.data());
}
unsigned BlobStorage::shareCount(const String& path)
{
ASSERT(!RunLoop::isMain());
auto linkPath = WebCore::fileSystemRepresentation(path);
struct stat stat;
if (::stat(linkPath.data(), &stat) < 0)
return 0;
// Link count is 2 in the single client case (the blob file and a link).
return stat.st_nlink - 1;
}
}
}
#endif
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