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// Copyright 2013 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "chrome/browser/sync_file_system/local/local_file_sync_status.h"
#include "base/check_op.h"
#include "base/containers/contains.h"
#include "base/observer_list.h"
#include "content/public/browser/browser_thread.h"
#include "storage/common/file_system/file_system_util.h"
using storage::FileSystemURL;
using storage::FileSystemURLSet;
namespace sync_file_system {
namespace {
using OriginAndType = LocalFileSyncStatus::OriginAndType;
OriginAndType GetOriginAndType(const storage::FileSystemURL& url) {
return std::make_pair(url.origin().GetURL(), url.type());
}
base::FilePath NormalizePath(const base::FilePath& path) {
// Ensure |path| has single trailing path-separator, so that we can use
// prefix-match to find descendants of |path| in an ordered container.
return base::FilePath(path.StripTrailingSeparators().value() +
storage::VirtualPath::kSeparator);
}
struct SetKeyHelper {
template <typename Iterator>
static const base::FilePath& GetKey(Iterator itr) {
return *itr;
}
};
struct MapKeyHelper {
template <typename Iterator>
static const base::FilePath& GetKey(Iterator itr) {
return itr->first;
}
};
template <typename Container, typename GetKeyHelper>
bool ContainsChildOrParent(const Container& paths,
const base::FilePath& path,
const GetKeyHelper& get_key_helper) {
base::FilePath normalized_path = NormalizePath(path);
// Check if |paths| has a child of |normalized_path|.
// Note that descendants of |normalized_path| are stored right after
// |normalized_path| since |normalized_path| has trailing path separator.
auto upper = paths.upper_bound(normalized_path);
if (upper != paths.end() &&
normalized_path.IsParent(get_key_helper.GetKey(upper)))
return true;
// Check if any ancestor of |normalized_path| is in |writing_|.
while (true) {
if (base::Contains(paths, normalized_path))
return true;
if (storage::VirtualPath::IsRootPath(normalized_path))
return false;
normalized_path =
NormalizePath(storage::VirtualPath::DirName(normalized_path));
}
}
} // namespace
LocalFileSyncStatus::LocalFileSyncStatus() = default;
LocalFileSyncStatus::~LocalFileSyncStatus() = default;
void LocalFileSyncStatus::StartWriting(const FileSystemURL& url) {
DCHECK_CURRENTLY_ON(content::BrowserThread::IO);
DCHECK(!IsChildOrParentSyncing(url));
writing_[GetOriginAndType(url)][NormalizePath(url.path())]++;
}
void LocalFileSyncStatus::EndWriting(const FileSystemURL& url) {
DCHECK_CURRENTLY_ON(content::BrowserThread::IO);
base::FilePath normalized_path = NormalizePath(url.path());
OriginAndType origin_and_type = GetOriginAndType(url);
int count = --writing_[origin_and_type][normalized_path];
if (count == 0) {
writing_[origin_and_type].erase(normalized_path);
if (writing_[origin_and_type].empty())
writing_.erase(origin_and_type);
for (auto& observer : observer_list_)
observer.OnSyncEnabled(url);
}
}
void LocalFileSyncStatus::StartSyncing(const FileSystemURL& url) {
DCHECK_CURRENTLY_ON(content::BrowserThread::IO);
DCHECK(!IsChildOrParentWriting(url));
DCHECK(!IsChildOrParentSyncing(url));
syncing_[GetOriginAndType(url)].insert(NormalizePath(url.path()));
}
void LocalFileSyncStatus::EndSyncing(const FileSystemURL& url) {
DCHECK_CURRENTLY_ON(content::BrowserThread::IO);
base::FilePath normalized_path = NormalizePath(url.path());
OriginAndType origin_and_type = GetOriginAndType(url);
syncing_[origin_and_type].erase(normalized_path);
if (syncing_[origin_and_type].empty())
syncing_.erase(origin_and_type);
for (auto& observer : observer_list_)
observer.OnSyncEnabled(url);
for (auto& observer : observer_list_)
observer.OnWriteEnabled(url);
}
bool LocalFileSyncStatus::IsWriting(const FileSystemURL& url) const {
DCHECK_CURRENTLY_ON(content::BrowserThread::IO);
return IsChildOrParentWriting(url);
}
bool LocalFileSyncStatus::IsWritable(const FileSystemURL& url) const {
DCHECK_CURRENTLY_ON(content::BrowserThread::IO);
return !IsChildOrParentSyncing(url);
}
bool LocalFileSyncStatus::IsSyncable(const FileSystemURL& url) const {
DCHECK_CURRENTLY_ON(content::BrowserThread::IO);
return !IsChildOrParentSyncing(url) && !IsChildOrParentWriting(url);
}
void LocalFileSyncStatus::AddObserver(Observer* observer) {
DCHECK_CURRENTLY_ON(content::BrowserThread::IO);
observer_list_.AddObserver(observer);
}
void LocalFileSyncStatus::RemoveObserver(Observer* observer) {
DCHECK_CURRENTLY_ON(content::BrowserThread::IO);
observer_list_.RemoveObserver(observer);
}
bool LocalFileSyncStatus::IsChildOrParentWriting(
const FileSystemURL& url) const {
DCHECK_CURRENTLY_ON(content::BrowserThread::IO);
auto found = writing_.find(GetOriginAndType(url));
if (found == writing_.end())
return false;
return ContainsChildOrParent(found->second, url.path(),
MapKeyHelper());
}
bool LocalFileSyncStatus::IsChildOrParentSyncing(
const FileSystemURL& url) const {
DCHECK_CURRENTLY_ON(content::BrowserThread::IO);
auto found = syncing_.find(GetOriginAndType(url));
if (found == syncing_.end())
return false;
return ContainsChildOrParent(found->second, url.path(),
SetKeyHelper());
}
} // namespace sync_file_system
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