[CacheStorage] Keep caches alive for 30 seconds after opening

content/browser/cache_storage/cache_storage_unittest.cc

+// Copyright 2015 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.h"
+
+#include "base/bind.h"
+#include "base/callback.h"
+#include "base/files/scoped_temp_dir.h"
+#include "base/run_loop.h"
+#include "base/stl_util.h"
+#include "base/thread_task_runner_handle.h"
+#include "content/public/test/test_browser_thread_bundle.h"
+#include "net/url_request/url_request_context_getter.h"
+#include "storage/browser/quota/quota_manager_proxy.h"
+#include "testing/gtest/include/gtest/gtest.h"
+
+namespace content {
+
+namespace {
+const char kOrigin[] = "http://example.com/";
+}
+
+class TestCacheStorage : public CacheStorage {
+ public:
+  explicit TestCacheStorage(const base::FilePath& file_path)
+      : CacheStorage(file_path,
+                     false /* memory_only */,
+                     base::ThreadTaskRunnerHandle::Get().get(),
+                     scoped_refptr<net::URLRequestContextGetter>(),
+                     scoped_refptr<storage::QuotaManagerProxy>(),
+                     base::WeakPtr<storage::BlobStorageContext>(),
+                     GURL(kOrigin)),
+        delay_preserved_cache_callback_(false) {}
+
+  void RunPreservedCacheCallback() {
+    ASSERT_FALSE(preserved_cache_callback_.is_null());
+    preserved_cache_callback_.Run();
+    preserved_cache_callback_.Reset();
+  }
+
+  void set_delay_preserved_cache_callback(bool should_delay) {
+    delay_preserved_cache_callback_ = should_delay;
+  }
+
+  bool IsPreservingCache(const CacheStorageCache* cache) {
+    return ContainsKey(preserved_caches_, cache);
+  }
+
+ private:
+  void SchedulePreservedCacheRemoval(const base::Closure& callback) override {
+    if (!delay_preserved_cache_callback_) {
+      base::ThreadTaskRunnerHandle::Get()->PostTask(FROM_HERE, callback);
+      return;
+    }
+    preserved_cache_callback_ = callback;
+  }
+
+  bool delay_preserved_cache_callback_;
+  base::Closure preserved_cache_callback_;
+};
+
+class CacheStorageTest : public testing::Test {
+ protected:
+  CacheStorageTest()
+      : browser_thread_bundle_(TestBrowserThreadBundle::IO_MAINLOOP) {}
+
+  void SetUp() override {
+    ASSERT_TRUE(temp_dir_.CreateUniqueTempDir());
+    test_cache_storage_.reset(new TestCacheStorage(temp_dir_.path()));
+  }
+
+  bool OpenCache(const std::string& cache_name) {
+    bool callback_called = false;
+    test_cache_storage_->OpenCache(
+        cache_name, base::Bind(&CacheStorageTest::OpenCacheCallback,
+                               base::Unretained(this), &callback_called));
+    base::RunLoop().RunUntilIdle();
+    EXPECT_TRUE(callback_called);
+    return callback_error_ == CACHE_STORAGE_OK;
+  }
+
+  void OpenCacheCallback(bool* callback_called,
+                         const scoped_refptr<CacheStorageCache>& cache,
+                         CacheStorageError error) {
+    *callback_called = true;
+    callback_cache_ = cache;
+    callback_error_ = error;
+  }
+
+  base::ScopedTempDir temp_dir_;
+  TestBrowserThreadBundle browser_thread_bundle_;
+  scoped_ptr<TestCacheStorage> test_cache_storage_;
+
+  scoped_refptr<CacheStorageCache> callback_cache_;
+  CacheStorageError callback_error_;
+};
+
+TEST_F(CacheStorageTest, PreserveCache) {
+  test_cache_storage_->set_delay_preserved_cache_callback(true);
+  EXPECT_TRUE(OpenCache("foo"));
+  EXPECT_TRUE(test_cache_storage_->IsPreservingCache(callback_cache_.get()));
+  test_cache_storage_->RunPreservedCacheCallback();
+  EXPECT_FALSE(test_cache_storage_->IsPreservingCache(callback_cache_.get()));
+
+  // Try opening it again, since the cache is already open (callback_cache_ is
+  // referencing it) the cache shouldn't be preserved again.
+  EXPECT_TRUE(OpenCache("foo"));
+  EXPECT_FALSE(test_cache_storage_->IsPreservingCache(callback_cache_.get()));
+
+  // Remove the reference to the cache so that it's deleted. After that, the
+  // next time it's opened will require the cache to be created again and
+  // preserved.
+  callback_cache_ = nullptr;
+  EXPECT_TRUE(OpenCache("foo"));
+  EXPECT_TRUE(test_cache_storage_->IsPreservingCache(callback_cache_.get()));
+  test_cache_storage_->RunPreservedCacheCallback();
+  EXPECT_FALSE(test_cache_storage_->IsPreservingCache(callback_cache_.get()));
+}
+
+}  // namespace content