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Issue 12794003: Initialize the simple cache backend at runtime. (Closed) Base URL: http://git.chromium.org/chromium/src.git@master
Patch Set: rebased to latest, auto-merged net.gyp Created 7 years, 8 months ago
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1 // Copyright (c) 2012 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 "net/disk_cache/cache_util.h"
6
7 #include "base/file_util.h"
8 #include "base/location.h"
9 #include "base/string_util.h"
10 #include "base/stringprintf.h"
11 #include "base/threading/thread_restrictions.h"
12 #include "base/threading/worker_pool.h"
13
14 namespace {
15
16 const int kMaxOldFolders = 100;
17
18 // Returns a fully qualified name from path and name, using a given name prefix
19 // and index number. For instance, if the arguments are "/foo", "bar" and 5, it
20 // will return "/foo/old_bar_005".
21 base::FilePath GetPrefixedName(const base::FilePath& path,
22 const std::string& name,
23 int index) {
24 std::string tmp = base::StringPrintf("%s%s_%03d", "old_",
25 name.c_str(), index);
26 return path.AppendASCII(tmp);
27 }
28
29 // This is a simple callback to cleanup old caches.
30 void CleanupCallback(const base::FilePath& path, const std::string& name) {
31 for (int i = 0; i < kMaxOldFolders; i++) {
32 base::FilePath to_delete = GetPrefixedName(path, name, i);
33 disk_cache::DeleteCache(to_delete, true);
34 }
35 }
36
37 // Returns a full path to rename the current cache, in order to delete it. path
38 // is the current folder location, and name is the current folder name.
39 base::FilePath GetTempCacheName(const base::FilePath& path,
40 const std::string& name) {
41 // We'll attempt to have up to kMaxOldFolders folders for deletion.
42 for (int i = 0; i < kMaxOldFolders; i++) {
43 base::FilePath to_delete = GetPrefixedName(path, name, i);
44 if (!file_util::PathExists(to_delete))
45 return to_delete;
46 }
47 return base::FilePath();
48 }
49
50 } // namespace
51
52 namespace disk_cache {
53
54 // In order to process a potentially large number of files, we'll rename the
55 // cache directory to old_ + original_name + number, (located on the same parent
56 // directory), and use a worker thread to delete all the files on all the stale
57 // cache directories. The whole process can still fail if we are not able to
58 // rename the cache directory (for instance due to a sharing violation), and in
59 // that case a cache for this profile (on the desired path) cannot be created.
60 bool DelayedCacheCleanup(const base::FilePath& full_path) {
61 // GetTempCacheName() and MoveCache() use synchronous file
62 // operations.
63 base::ThreadRestrictions::ScopedAllowIO allow_io;
64
65 base::FilePath current_path = full_path.StripTrailingSeparators();
66
67 base::FilePath path = current_path.DirName();
68 base::FilePath name = current_path.BaseName();
69 #if defined(OS_POSIX)
70 std::string name_str = name.value();
71 #elif defined(OS_WIN)
72 // We created this file so it should only contain ASCII.
73 std::string name_str = WideToASCII(name.value());
74 #endif
75
76 base::FilePath to_delete = GetTempCacheName(path, name_str);
77 if (to_delete.empty()) {
78 LOG(ERROR) << "Unable to get another cache folder";
79 return false;
80 }
81
82 if (!disk_cache::MoveCache(full_path, to_delete)) {
83 LOG(ERROR) << "Unable to move cache folder " << full_path.value() << " to "
84 << to_delete.value();
85 return false;
86 }
87
88 base::WorkerPool::PostTask(
89 FROM_HERE, base::Bind(&CleanupCallback, path, name_str), true);
90 return true;
91 }
92
93 } // namespace disk_cache
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