SimpleCache: try to recover on CreateEntry on missing cache dir

net/disk_cache/entry_unittest.cc

 // 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 <utility>
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
 #include "base/files/file.h"
 #include "base/files/file_util.h"
 #include "base/macros.h"
 #include "base/run_loop.h"
 #include "base/strings/string_number_conversions.h"
 #include "base/strings/string_util.h"
 #include "base/test/histogram_tester.h"
 #include "base/threading/platform_thread.h"
 #include "net/base/completion_callback.h"
 #include "net/base/io_buffer.h"
 #include "net/base/net_errors.h"
 #include "net/base/test_completion_callback.h"
 #include "net/disk_cache/blockfile/backend_impl.h"
 #include "net/disk_cache/blockfile/entry_impl.h"
+#include "net/disk_cache/cache_util.h"
 #include "net/disk_cache/disk_cache_test_base.h"
 #include "net/disk_cache/disk_cache_test_util.h"
 #include "net/disk_cache/memory/mem_entry_impl.h"
 #include "net/disk_cache/simple/simple_backend_impl.h"
 #include "net/disk_cache/simple/simple_entry_format.h"
 #include "net/disk_cache/simple/simple_entry_impl.h"
 #include "net/disk_cache/simple/simple_synchronous_entry.h"
 #include "net/disk_cache/simple/simple_test_util.h"
 #include "net/disk_cache/simple/simple_util.h"
 #include "net/test/gtest_util.h"
@@ skipping 4260 matching lines @@
   entry->Close();
 
   base::RunLoop().RunUntilIdle();
   disk_cache::SimpleBackendImpl::FlushWorkerPoolForTesting();
   base::RunLoop().RunUntilIdle();
 
   EXPECT_TRUE(
       disk_cache::simple_util::CorruptStream0LengthFromEntry(key, cache_path_));
   EXPECT_NE(net::OK, OpenEntry(key, &entry));
 }
+
+TEST_F(DiskCacheEntryTest, SimpleCacheCreateRecoverFromRmdir) {
+  // This test runs as APP_CACHE to make operations more synchronous.
+  // (in particular we want to see if create succeeded or not, so we don't
+  //  want an optimistic one).
+  SetCacheType(net::APP_CACHE);
+  SetSimpleCacheMode();
+  InitCache();
+
+  // Pretend someone deleted the cache dir. This shouldn't be too scary in
+  // the test since cache_path_ is set as:
+  //   CHECK(temp_dir_.CreateUniqueTempDir());
+  //   cache_path_ = temp_dir_.GetPath();
+  disk_cache::DeleteCache(cache_path_,
+                          true /* delete the dir, what we really want*/);
+
+  disk_cache::Entry* entry;
+  std::string key("a key");
+  ASSERT_THAT(CreateEntry(key, &entry), IsOk());
+  entry->Close();
+}