safe_browsing_database.cc revision c407dc5cd9bdc5668497f21b26b09d988ab439de 
1// Copyright (c) 2009 The Chromium Authors. All rights reserved.
2// Use of this source code is governed by a BSD-style license that can be
3// found in the LICENSE file.
4
5#include "chrome/browser/safe_browsing/safe_browsing_database.h"
6
7#include "base/file_util.h"
8#include "base/histogram.h"
9#include "chrome/browser/safe_browsing/bloom_filter.h"
10#include "chrome/browser/safe_browsing/safe_browsing_database_bloom.h"
11
12using base::TimeTicks;
13
14// Filename suffix for the bloom filter.
15static const FilePath::CharType kBloomFilterFile[] =
16    FILE_PATH_LITERAL(" Filter 2");
17
18// Factory method.
19SafeBrowsingDatabase* SafeBrowsingDatabase::Create() {
20  return new SafeBrowsingDatabaseBloom;
21}
22
23SafeBrowsingDatabase::~SafeBrowsingDatabase() {
24}
25
26// static
27FilePath SafeBrowsingDatabase::BloomFilterFilename(
28    const FilePath& db_filename) {
29  return FilePath(db_filename.value() + kBloomFilterFile);
30}
31
32void SafeBrowsingDatabase::LoadBloomFilter() {
33  DCHECK(!bloom_filter_filename_.empty());
34
35  // If we're missing either of the database or filter files, we wait until the
36  // next update to generate a new filter.
37  // TODO(paulg): Investigate how often the filter file is missing and how
38  // expensive it would be to regenerate it.
39  int64 size_64;
40  if (!file_util::GetFileSize(filename_, &size_64) || size_64 == 0)
41    return;
42
43  if (!file_util::GetFileSize(bloom_filter_filename_, &size_64) ||
44      size_64 == 0) {
45    UMA_HISTOGRAM_COUNTS("SB2.FilterMissing", 1);
46    return;
47  }
48
49  // We have a bloom filter file, so use that as our filter.
50  TimeTicks before = TimeTicks::Now();
51  bloom_filter_ = BloomFilter::LoadFile(bloom_filter_filename_);
52  SB_DLOG(INFO) << "SafeBrowsingDatabase read bloom filter in "
53                << (TimeTicks::Now() - before).InMilliseconds() << " ms";
54
55  if (!bloom_filter_.get())
56    UMA_HISTOGRAM_COUNTS("SB2.FilterReadFail", 1);
57}
58
59void SafeBrowsingDatabase::DeleteBloomFilter() {
60  file_util::Delete(bloom_filter_filename_, false);
61}
62
63void SafeBrowsingDatabase::WriteBloomFilter() {
64  if (!bloom_filter_.get())
65    return;
66
67  TimeTicks before = TimeTicks::Now();
68  bool write_ok = bloom_filter_->WriteFile(bloom_filter_filename_);
69  SB_DLOG(INFO) << "SafeBrowsingDatabase wrote bloom filter in " <<
70      (TimeTicks::Now() - before).InMilliseconds() << " ms";
71
72  if (!write_ok)
73    UMA_HISTOGRAM_COUNTS("SB2.FilterWriteFail", 1);
74}
75