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// Copyright (c) 2008 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 "base/directory_watcher.h"
#include <fstream>
#include "base/file_path.h"
#include "base/file_util.h"
#include "base/logging.h"
#include "base/message_loop.h"
#include "base/path_service.h"
#include "base/string_util.h"
#include "testing/gtest/include/gtest/gtest.h"
// For tests where we wait a bit to verify nothing happened
namespace {
const int kWaitForEventTime = 500;
}
class DirectoryWatcherTest : public testing::Test,
public DirectoryWatcher::Delegate {
protected:
virtual void SetUp() {
// Name a subdirectory of the temp directory.
std::wstring path_str;
ASSERT_TRUE(PathService::Get(base::DIR_TEMP, &path_str));
test_dir_ = FilePath(path_str).Append(
FILE_PATH_LITERAL("DirectoryWatcherTest"));
// Create a fresh, empty copy of this directory.
file_util::Delete(test_dir_.value(), true);
file_util::CreateDirectory(test_dir_.value());
directory_mods_ = 0;
quit_mod_count_ = 0;
}
virtual void OnDirectoryChanged(const FilePath& path) {
++directory_mods_;
if (directory_mods_ == quit_mod_count_)
MessageLoop::current()->Quit();
}
virtual void TearDown() {
// Clean up test directory.
ASSERT_TRUE(file_util::Delete(test_dir_.value(), true));
ASSERT_FALSE(file_util::PathExists(test_dir_.value()));
}
// Write |content| to a file under the test directory.
void WriteTestDirFile(const FilePath::StringType& filename,
const std::string& content) {
FilePath path = test_dir_.Append(filename);
std::ofstream file;
file.open(WideToUTF8(path.value()).c_str());
file << content;
file.close();
}
// Run the message loop until we've seen |n| directory modifications.
void LoopUntilModsEqual(int n) {
quit_mod_count_ = n;
loop_.Run();
}
MessageLoop loop_;
// The path to a temporary directory used for testing.
FilePath test_dir_;
// The number of times a directory modification has been observed.
int directory_mods_;
// The number of directory mods which, when reached, cause us to quit
// our message loop.
int quit_mod_count_;
};
// Basic test: add a file and verify we notice it.
TEST_F(DirectoryWatcherTest, NewFile) {
DirectoryWatcher watcher;
ASSERT_TRUE(watcher.Watch(test_dir_, this));
WriteTestDirFile(FILE_PATH_LITERAL("test_file"), "some content");
LoopUntilModsEqual(2);
}
// Verify that modifying a file is caught.
TEST_F(DirectoryWatcherTest, ModifiedFile) {
DirectoryWatcher watcher;
ASSERT_TRUE(watcher.Watch(test_dir_, this));
// Write a file to the test dir.
WriteTestDirFile(FILE_PATH_LITERAL("test_file"), "some content");
LoopUntilModsEqual(2);
// Now make sure we get notified if the file is modified.
WriteTestDirFile(FILE_PATH_LITERAL("test_file"), "some new content");
LoopUntilModsEqual(3);
}
// Verify that letting the watcher go out of scope stops notifications.
TEST_F(DirectoryWatcherTest, Unregister) {
{
DirectoryWatcher watcher;
ASSERT_TRUE(watcher.Watch(test_dir_, this));
// And then let it fall out of scope, clearing its watch.
}
// Write a file to the test dir.
WriteTestDirFile(FILE_PATH_LITERAL("test_file"), "some content");
// We won't get a notification, so we just wait around a bit to verify
// that notification doesn't come.
loop_.PostDelayedTask(FROM_HERE, new MessageLoop::QuitTask,
kWaitForEventTime);
loop_.Run();
ASSERT_EQ(directory_mods_, 0);
}
// Verify that modifications to a subdirectory isn't noticed.
TEST_F(DirectoryWatcherTest, SubDir) {
FilePath subdir = test_dir_.Append(FILE_PATH_LITERAL("SubDir"));
ASSERT_TRUE(file_util::CreateDirectory(subdir.value()));
DirectoryWatcher watcher;
ASSERT_TRUE(watcher.Watch(test_dir_, this));
// Write a file to the subdir.
FilePath test_path = subdir.Append(FILE_PATH_LITERAL("test_file"));
WriteTestDirFile(test_path.value(), "some content");
// We won't get a notification, so we just wait around a bit to verify
// that notification doesn't come.
loop_.PostDelayedTask(FROM_HERE, new MessageLoop::QuitTask,
kWaitForEventTime);
loop_.Run();
// We shouldn't have been notified and shouldn't have crashed.
ASSERT_EQ(directory_mods_, 0);
}
namespace {
// Used by the DeleteDuringNotify test below.
// Deletes the DirectoryWatcher when it's notified.
class Deleter : public DirectoryWatcher::Delegate {
public:
Deleter(DirectoryWatcher* watcher) : watcher_(watcher) {}
virtual void OnDirectoryChanged(const FilePath& path) {
watcher_.reset(NULL);
MessageLoop::current()->Quit();
}
scoped_ptr<DirectoryWatcher> watcher_;
};
} // anonymous namespace
// Verify that deleting a watcher during the callback
TEST_F(DirectoryWatcherTest, DeleteDuringNotify) {
DirectoryWatcher* watcher = new DirectoryWatcher;
Deleter deleter(watcher); // Takes ownership of watcher.
ASSERT_TRUE(watcher->Watch(test_dir_, &deleter));
WriteTestDirFile(FILE_PATH_LITERAL("test_file"), "some content");
LoopUntilModsEqual(2);
// We win if we haven't crashed yet.
// Might as well double-check it got deleted, too.
ASSERT_TRUE(deleter.watcher_.get() == NULL);
}
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