Index: net/disk_cache/cache_util.cc |
diff --git a/net/disk_cache/cache_util.cc b/net/disk_cache/cache_util.cc |
new file mode 100644 |
index 0000000000000000000000000000000000000000..c857d1269f897c01a241044d29621af9ea00fb27 |
--- /dev/null |
+++ b/net/disk_cache/cache_util.cc |
@@ -0,0 +1,93 @@ |
+// Copyright (c) 2012 The Chromium Authors. All rights reserved. |
+// Use of this source code is governed by a BSD-style license that can be |
+// found in the LICENSE file. |
+ |
+#include "net/disk_cache/cache_util.h" |
+ |
+#include "base/file_util.h" |
+#include "base/location.h" |
+#include "base/string_util.h" |
+#include "base/stringprintf.h" |
+#include "base/threading/thread_restrictions.h" |
+#include "base/threading/worker_pool.h" |
+ |
+namespace { |
+ |
+const int kMaxOldFolders = 100; |
+ |
+// Returns a fully qualified name from path and name, using a given name prefix |
+// and index number. For instance, if the arguments are "/foo", "bar" and 5, it |
+// will return "/foo/old_bar_005". |
+base::FilePath GetPrefixedName(const base::FilePath& path, |
+ const std::string& name, |
+ int index) { |
+ std::string tmp = base::StringPrintf("%s%s_%03d", "old_", |
+ name.c_str(), index); |
+ return path.AppendASCII(tmp); |
+} |
+ |
+// This is a simple callback to cleanup old caches. |
+void CleanupCallback(const base::FilePath& path, const std::string& name) { |
+ for (int i = 0; i < kMaxOldFolders; i++) { |
+ base::FilePath to_delete = GetPrefixedName(path, name, i); |
+ disk_cache::DeleteCache(to_delete, true); |
+ } |
+} |
+ |
+// Returns a full path to rename the current cache, in order to delete it. path |
+// is the current folder location, and name is the current folder name. |
+base::FilePath GetTempCacheName(const base::FilePath& path, |
+ const std::string& name) { |
+ // We'll attempt to have up to kMaxOldFolders folders for deletion. |
+ for (int i = 0; i < kMaxOldFolders; i++) { |
+ base::FilePath to_delete = GetPrefixedName(path, name, i); |
+ if (!file_util::PathExists(to_delete)) |
+ return to_delete; |
+ } |
+ return base::FilePath(); |
+} |
+ |
+} // namespace |
+ |
+namespace disk_cache { |
+ |
+// In order to process a potentially large number of files, we'll rename the |
+// cache directory to old_ + original_name + number, (located on the same parent |
+// directory), and use a worker thread to delete all the files on all the stale |
+// cache directories. The whole process can still fail if we are not able to |
+// rename the cache directory (for instance due to a sharing violation), and in |
+// that case a cache for this profile (on the desired path) cannot be created. |
+bool DelayedCacheCleanup(const base::FilePath& full_path) { |
+ // GetTempCacheName() and MoveCache() use synchronous file |
+ // operations. |
+ base::ThreadRestrictions::ScopedAllowIO allow_io; |
+ |
+ base::FilePath current_path = full_path.StripTrailingSeparators(); |
+ |
+ base::FilePath path = current_path.DirName(); |
+ base::FilePath name = current_path.BaseName(); |
+#if defined(OS_POSIX) |
+ std::string name_str = name.value(); |
+#elif defined(OS_WIN) |
+ // We created this file so it should only contain ASCII. |
+ std::string name_str = WideToASCII(name.value()); |
+#endif |
+ |
+ base::FilePath to_delete = GetTempCacheName(path, name_str); |
+ if (to_delete.empty()) { |
+ LOG(ERROR) << "Unable to get another cache folder"; |
+ return false; |
+ } |
+ |
+ if (!disk_cache::MoveCache(full_path, to_delete)) { |
+ LOG(ERROR) << "Unable to move cache folder " << full_path.value() << " to " |
+ << to_delete.value(); |
+ return false; |
+ } |
+ |
+ base::WorkerPool::PostTask( |
+ FROM_HERE, base::Bind(&CleanupCallback, path, name_str), true); |
+ return true; |
+} |
+ |
+} // namespace disk_cache |