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| 1 // Copyright (c) 2012 The Chromium Authors. All rights reserved. | |
| 2 // Use of this source code is governed by a BSD-style license that can be | |
| 3 // found in the LICENSE file. | |
| 4 | |
| 5 #ifndef WEBKIT_FILEAPI_FILE_SYSTEM_DIRECTORY_DATABASE_H_ | |
| 6 #define WEBKIT_FILEAPI_FILE_SYSTEM_DIRECTORY_DATABASE_H_ | |
| 7 | |
| 8 #include <string> | |
| 9 #include <vector> | |
| 10 | |
| 11 #include "base/files/file_path.h" | |
| 12 #include "base/memory/scoped_ptr.h" | |
| 13 #include "base/time.h" | |
| 14 #include "webkit/storage/webkit_storage_export.h" | |
| 15 | |
| 16 namespace tracked_objects { | |
| 17 class Location; | |
| 18 } | |
| 19 | |
| 20 namespace leveldb { | |
| 21 class DB; | |
| 22 class Status; | |
| 23 class WriteBatch; | |
| 24 } | |
| 25 | |
| 26 namespace fileapi { | |
| 27 | |
| 28 // This class WILL NOT protect you against producing directory loops, giving an | |
| 29 // empty directory a backing data file, giving two files the same backing file, | |
| 30 // or pointing to a nonexistent backing file. It does no file IO other than | |
| 31 // that involved with talking to its underlying database. It does not create or | |
| 32 // in any way touch real files; it only creates path entries in its database. | |
| 33 | |
| 34 // TODO(ericu): Safe mode, which does more checks such as the above on debug | |
| 35 // builds. | |
| 36 // TODO(ericu): Add a method that will give a unique filename for a data file. | |
| 37 class WEBKIT_STORAGE_EXPORT_PRIVATE FileSystemDirectoryDatabase { | |
| 38 public: | |
| 39 typedef int64 FileId; | |
| 40 | |
| 41 struct WEBKIT_STORAGE_EXPORT_PRIVATE FileInfo { | |
| 42 FileInfo(); | |
| 43 ~FileInfo(); | |
| 44 | |
| 45 bool is_directory() const { | |
| 46 return data_path.empty(); | |
| 47 } | |
| 48 | |
| 49 FileId parent_id; | |
| 50 base::FilePath data_path; | |
| 51 base::FilePath::StringType name; | |
| 52 // This modification time is valid only for directories, not files, as | |
| 53 // FileWriter will get the files out of sync. | |
| 54 // For files, look at the modification time of the underlying data_path. | |
| 55 base::Time modification_time; | |
| 56 }; | |
| 57 | |
| 58 explicit FileSystemDirectoryDatabase( | |
| 59 const base::FilePath& filesystem_data_directory); | |
| 60 ~FileSystemDirectoryDatabase(); | |
| 61 | |
| 62 bool GetChildWithName( | |
| 63 FileId parent_id, const base::FilePath::StringType& name, FileId* child_id
); | |
| 64 bool GetFileWithPath(const base::FilePath& path, FileId* file_id); | |
| 65 // ListChildren will succeed, returning 0 children, if parent_id doesn't | |
| 66 // exist. | |
| 67 bool ListChildren(FileId parent_id, std::vector<FileId>* children); | |
| 68 bool GetFileInfo(FileId file_id, FileInfo* info); | |
| 69 bool AddFileInfo(const FileInfo& info, FileId* file_id); | |
| 70 bool RemoveFileInfo(FileId file_id); | |
| 71 // This does a full update of the FileInfo, and is what you'd use for moves | |
| 72 // and renames. If you just want to update the modification_time, use | |
| 73 // UpdateModificationTime. | |
| 74 bool UpdateFileInfo(FileId file_id, const FileInfo& info); | |
| 75 bool UpdateModificationTime( | |
| 76 FileId file_id, const base::Time& modification_time); | |
| 77 // This is used for an overwriting move of a file [not a directory] on top of | |
| 78 // another file [also not a directory]; we need to alter two files' info in a | |
| 79 // single transaction to avoid weird backing file references in the event of a | |
| 80 // partial failure. | |
| 81 bool OverwritingMoveFile(FileId src_file_id, FileId dest_file_id); | |
| 82 | |
| 83 // This produces the series 0, 1, 2..., starting at 0 when the underlying | |
| 84 // filesystem is first created, and maintaining state across | |
| 85 // creation/destruction of FileSystemDirectoryDatabase objects. | |
| 86 bool GetNextInteger(int64* next); | |
| 87 | |
| 88 // Returns true if the database looks consistent with local filesystem. | |
| 89 bool IsFileSystemConsistent(); | |
| 90 | |
| 91 static bool DestroyDatabase(const base::FilePath& path); | |
| 92 | |
| 93 private: | |
| 94 enum RecoveryOption { | |
| 95 DELETE_ON_CORRUPTION, | |
| 96 REPAIR_ON_CORRUPTION, | |
| 97 FAIL_ON_CORRUPTION, | |
| 98 }; | |
| 99 | |
| 100 friend class FileSystemDirectoryDatabaseTest; | |
| 101 | |
| 102 bool Init(RecoveryOption recovery_option); | |
| 103 bool RepairDatabase(const std::string& db_path); | |
| 104 void ReportInitStatus(const leveldb::Status& status); | |
| 105 bool StoreDefaultValues(); | |
| 106 bool GetLastFileId(FileId* file_id); | |
| 107 bool VerifyIsDirectory(FileId file_id); | |
| 108 bool AddFileInfoHelper( | |
| 109 const FileInfo& info, FileId file_id, leveldb::WriteBatch* batch); | |
| 110 bool RemoveFileInfoHelper(FileId file_id, leveldb::WriteBatch* batch); | |
| 111 void HandleError(const tracked_objects::Location& from_here, | |
| 112 const leveldb::Status& status); | |
| 113 | |
| 114 const base::FilePath filesystem_data_directory_; | |
| 115 scoped_ptr<leveldb::DB> db_; | |
| 116 base::Time last_reported_time_; | |
| 117 DISALLOW_COPY_AND_ASSIGN(FileSystemDirectoryDatabase); | |
| 118 }; | |
| 119 | |
| 120 } // namespace fileapi | |
| 121 | |
| 122 #endif // WEBKIT_FILEAPI_FILE_SYSTEM_DIRECTORY_DATABASE_H_ | |
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