[CacheStorage] Garbage collect unreferenced caches

content/browser/cache_storage/cache_storage_manager_unittest.cc

 // Copyright 2014 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 "content/browser/cache_storage/cache_storage_manager.h"
 
 #include "base/files/file_path.h"
 #include "base/files/file_util.h"
 #include "base/files/scoped_temp_dir.h"
 #include "base/guid.h"
@@ skipping 637 matching lines @@
 }
 
 TEST_F(CacheStorageManagerTest, MemoryBackedSizePersistent) {
   CacheStorage* cache_storage = CacheStorageForOrigin(origin1_);
   EXPECT_EQ(0, cache_storage->MemoryBackedSize());
   EXPECT_TRUE(Open(origin1_, "foo"));
   EXPECT_TRUE(CachePut(callback_cache_, GURL("http://example.com/foo")));
   EXPECT_EQ(0, cache_storage->MemoryBackedSize());
 }
 
+TEST_F(CacheStorageManagerTest, DeleteUnreferencedCacheDirectories) {
+  // Create a referenced cache.
+  EXPECT_TRUE(Open(origin1_, "foo"));
+  EXPECT_TRUE(CachePut(callback_cache_, GURL("http://example.com/foo")));
+
+  // Create an unreferenced directory next to the referenced one.
+  base::FilePath origin_path = CacheStorageManager::ConstructOriginPath(
+      cache_manager_->root_path(), origin1_);
+  base::FilePath unreferenced_path = origin_path.AppendASCII("bar");
+  EXPECT_TRUE(CreateDirectory(unreferenced_path));
+  EXPECT_TRUE(base::DirectoryExists(unreferenced_path));
+
+  // Create a new StorageManager so that the next time the cache is opened
+  // the unreferenced directory can be deleted.
+  quota_manager_proxy_->SimulateQuotaManagerDestroyed();
+  cache_manager_ = CacheStorageManager::Create(cache_manager_.get());
+
+  // Verify that the referenced cache still works.
+  EXPECT_TRUE(Open(origin1_, "foo"));
+  EXPECT_TRUE(CacheMatch(callback_cache_, GURL("http://example.com/foo")));
+
+  // Verify that the unreferenced cache is gone.
+  EXPECT_FALSE(base::DirectoryExists(unreferenced_path));
+}
+
 class CacheStorageMigrationTest : public CacheStorageManagerTest {
  protected:
   CacheStorageMigrationTest() : cache1_("foo"), cache2_("bar") {}
 
   void SetUp() override {
     CacheStorageManagerTest::SetUp();
 
     // Populate a cache, then move it to the "legacy" location
     // so that tests can verify the results of migration.
     legacy_path_ = CacheStorageManager::ConstructLegacyOriginPath(
@@ skipping 316 matching lines @@
 
 INSTANTIATE_TEST_CASE_P(CacheStorageManagerTests,
                         CacheStorageManagerTestP,
                         ::testing::Values(false, true));
 
 INSTANTIATE_TEST_CASE_P(CacheStorageQuotaClientTests,
                         CacheStorageQuotaClientTestP,
                         ::testing::Values(false, true));
 
 }  // namespace content