content/browser/indexed_db/indexed_db_leveldb_coding.h

   1 // Copyright (c) 2013 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 CONTENT_BROWSER_INDEXED_DB_INDEXED_DB_LEVELDB_CODING_H_
   6 #define CONTENT_BROWSER_INDEXED_DB_INDEXED_DB_LEVELDB_CODING_H_
   7
   8 #include <string>
   9 #include <utility>
  10 #include <vector>
  11
  12 #include "base/basictypes.h"
  13 #include "base/logging.h"
  14 #include "base/memory/ref_counted.h"
  15 #include "base/memory/scoped_ptr.h"
  16 #include "base/strings/string16.h"
  17 #include "base/strings/string_piece.h"
  18 #include "content/common/indexed_db/indexed_db_key.h"
  19 #include "content/common/indexed_db/indexed_db_key_path.h"
  20
  21 namespace content {
  22
  23 CONTENT_EXPORT extern const unsigned char kMinimumIndexId;
  24
  25 CONTENT_EXPORT std::string MaxIDBKey();
  26 CONTENT_EXPORT std::string MinIDBKey();
  27
  28 // DatabaseId, BlobKey
  29 typedef std::pair<int64_t, int64_t> BlobJournalEntryType;
  30 typedef std::vector<BlobJournalEntryType> BlobJournalType;
  31
  32 CONTENT_EXPORT void EncodeByte(unsigned char value, std::string* into);
  33 CONTENT_EXPORT void EncodeBool(bool value, std::string* into);
  34 CONTENT_EXPORT void EncodeInt(int64 value, std::string* into);
  35 CONTENT_EXPORT void EncodeVarInt(int64 value, std::string* into);
  36 CONTENT_EXPORT void EncodeString(const base::string16& value,
  37                                  std::string* into);
  38 CONTENT_EXPORT void EncodeStringWithLength(const base::string16& value,
  39                                            std::string* into);
  40 CONTENT_EXPORT void EncodeBinary(const std::string& value, std::string* into);
  41 CONTENT_EXPORT void EncodeDouble(double value, std::string* into);
  42 CONTENT_EXPORT void EncodeIDBKey(const IndexedDBKey& value, std::string* into);
  43 CONTENT_EXPORT void EncodeIDBKeyPath(const IndexedDBKeyPath& value,
  44                                      std::string* into);
  45 CONTENT_EXPORT void EncodeBlobJournal(const BlobJournalType& journal,
  46                                       std::string* into);
  47
  48 CONTENT_EXPORT WARN_UNUSED_RESULT bool DecodeByte(base::StringPiece* slice,
  49                                                   unsigned char* value);
  50 CONTENT_EXPORT WARN_UNUSED_RESULT bool DecodeBool(base::StringPiece* slice,
  51                                                   bool* value);
  52 CONTENT_EXPORT WARN_UNUSED_RESULT bool DecodeInt(base::StringPiece* slice,
  53                                                  int64* value);
  54 CONTENT_EXPORT WARN_UNUSED_RESULT bool DecodeVarInt(base::StringPiece* slice,
  55                                                     int64* value);
  56 CONTENT_EXPORT WARN_UNUSED_RESULT bool DecodeString(base::StringPiece* slice,
  57                                                     base::string16* value);
  58 CONTENT_EXPORT WARN_UNUSED_RESULT bool DecodeStringWithLength(
  59     base::StringPiece* slice,
  60     base::string16* value);
  61 CONTENT_EXPORT WARN_UNUSED_RESULT bool DecodeBinary(base::StringPiece* slice,
  62                                                     std::string* value);
  63 CONTENT_EXPORT WARN_UNUSED_RESULT bool DecodeDouble(base::StringPiece* slice,
  64                                                     double* value);
  65 CONTENT_EXPORT WARN_UNUSED_RESULT bool DecodeIDBKey(
  66     base::StringPiece* slice,
  67     scoped_ptr<IndexedDBKey>* value);
  68 CONTENT_EXPORT WARN_UNUSED_RESULT bool DecodeIDBKeyPath(
  69     base::StringPiece* slice,
  70     IndexedDBKeyPath* value);
  71 CONTENT_EXPORT WARN_UNUSED_RESULT bool DecodeBlobJournal(
  72     base::StringPiece* slice,
  73     BlobJournalType* journal);
  74
  75 CONTENT_EXPORT int CompareEncodedStringsWithLength(base::StringPiece* slice1,
  76                                                    base::StringPiece* slice2,
  77                                                    bool* ok);
  78
  79 CONTENT_EXPORT WARN_UNUSED_RESULT bool ExtractEncodedIDBKey(
  80     base::StringPiece* slice,
  81     std::string* result);
  82
  83 CONTENT_EXPORT int CompareEncodedIDBKeys(base::StringPiece* slice1,
  84                                          base::StringPiece* slice2,
  85                                          bool* ok);
  86
  87 CONTENT_EXPORT int Compare(const base::StringPiece& a,
  88                            const base::StringPiece& b,
  89                            bool index_keys);
  90
  91 class KeyPrefix {
  92  public:
  93   // These are serialized to disk; any new items must be appended, and none can
  94   // be deleted.
  95   enum Type {
  96     GLOBAL_METADATA,
  97     DATABASE_METADATA,
  98     OBJECT_STORE_DATA,
  99     EXISTS_ENTRY,
 100     INDEX_DATA,
 101     INVALID_TYPE,
 102     BLOB_ENTRY
 103   };
 104
 105   static const size_t kMaxDatabaseIdSizeBits = 3;
 106   static const size_t kMaxObjectStoreIdSizeBits = 3;
 107   static const size_t kMaxIndexIdSizeBits = 2;
 108
 109   static const size_t kMaxDatabaseIdSizeBytes =
 110       1ULL << kMaxDatabaseIdSizeBits;  // 8
 111   static const size_t kMaxObjectStoreIdSizeBytes =
 112       1ULL << kMaxObjectStoreIdSizeBits;                                   // 8
 113   static const size_t kMaxIndexIdSizeBytes = 1ULL << kMaxIndexIdSizeBits;  // 4
 114
 115   static const size_t kMaxDatabaseIdBits =
 116       kMaxDatabaseIdSizeBytes * 8 - 1;  // 63
 117   static const size_t kMaxObjectStoreIdBits =
 118       kMaxObjectStoreIdSizeBytes * 8 - 1;                              // 63
 119   static const size_t kMaxIndexIdBits = kMaxIndexIdSizeBytes * 8 - 1;  // 31
 120
 121   static const int64 kMaxDatabaseId =
 122       (1ULL << kMaxDatabaseIdBits) - 1;  // max signed int64
 123   static const int64 kMaxObjectStoreId =
 124       (1ULL << kMaxObjectStoreIdBits) - 1;  // max signed int64
 125   static const int64 kMaxIndexId =
 126       (1ULL << kMaxIndexIdBits) - 1;  // max signed int32
 127
 128   static const int64 kInvalidId = -1;
 129
 130   KeyPrefix();
 131   explicit KeyPrefix(int64 database_id);
 132   KeyPrefix(int64 database_id, int64 object_store_id);
 133   KeyPrefix(int64 database_id, int64 object_store_id, int64 index_id);
 134   static KeyPrefix CreateWithSpecialIndex(int64 database_id,
 135                                           int64 object_store_id,
 136                                           int64 index_id);
 137
 138   static bool Decode(base::StringPiece* slice, KeyPrefix* result);
 139   std::string Encode() const;
 140   static std::string EncodeEmpty();
 141   int Compare(const KeyPrefix& other) const;
 142
 143   CONTENT_EXPORT static bool IsValidDatabaseId(int64 database_id);
 144   static bool IsValidObjectStoreId(int64 index_id);
 145   static bool IsValidIndexId(int64 index_id);
 146   static bool ValidIds(int64 database_id,
 147                        int64 object_store_id,
 148                        int64 index_id) {
 149     return IsValidDatabaseId(database_id) &&
 150            IsValidObjectStoreId(object_store_id) && IsValidIndexId(index_id);
 151   }
 152   static bool ValidIds(int64 database_id, int64 object_store_id) {
 153     return IsValidDatabaseId(database_id) &&
 154            IsValidObjectStoreId(object_store_id);
 155   }
 156
 157   Type type() const;
 158
 159   int64 database_id_;
 160   int64 object_store_id_;
 161   int64 index_id_;
 162
 163  private:
 164   // Special constructor for CreateWithSpecialIndex()
 165   KeyPrefix(enum Type,
 166             int64 database_id,
 167             int64 object_store_id,
 168             int64 index_id);
 169
 170   static std::string EncodeInternal(int64 database_id,
 171                                     int64 object_store_id,
 172                                     int64 index_id);
 173 };
 174
 175 class SchemaVersionKey {
 176  public:
 177   CONTENT_EXPORT static std::string Encode();
 178 };
 179
 180 class MaxDatabaseIdKey {
 181  public:
 182   CONTENT_EXPORT static std::string Encode();
 183 };
 184
 185 class DataVersionKey {
 186  public:
 187   static std::string Encode();
 188 };
 189
 190 class BlobJournalKey {
 191  public:
 192   static std::string Encode();
 193 };
 194
 195 class LiveBlobJournalKey {
 196  public:
 197   static std::string Encode();
 198 };
 199
 200 class DatabaseFreeListKey {
 201  public:
 202   DatabaseFreeListKey();
 203   static bool Decode(base::StringPiece* slice, DatabaseFreeListKey* result);
 204   CONTENT_EXPORT static std::string Encode(int64 database_id);
 205   static CONTENT_EXPORT std::string EncodeMaxKey();
 206   int64 DatabaseId() const;
 207   int Compare(const DatabaseFreeListKey& other) const;
 208
 209  private:
 210   int64 database_id_;
 211 };
 212
 213 class DatabaseNameKey {
 214  public:
 215   static bool Decode(base::StringPiece* slice, DatabaseNameKey* result);
 216   CONTENT_EXPORT static std::string Encode(const std::string& origin_identifier,
 217                                            const base::string16& database_name);
 218   static std::string EncodeMinKeyForOrigin(
 219       const std::string& origin_identifier);
 220   static std::string EncodeStopKeyForOrigin(
 221       const std::string& origin_identifier);
 222   base::string16 origin() const { return origin_; }
 223   base::string16 database_name() const { return database_name_; }
 224   int Compare(const DatabaseNameKey& other);
 225
 226  private:
 227   base::string16 origin_;  // TODO(jsbell): Store encoded strings, or just
 228                            // pointers.
 229   base::string16 database_name_;
 230 };
 231
 232 class DatabaseMetaDataKey {
 233  public:
 234   enum MetaDataType {
 235     ORIGIN_NAME = 0,
 236     DATABASE_NAME = 1,
 237     USER_VERSION = 2,
 238     MAX_OBJECT_STORE_ID = 3,
 239     USER_INT_VERSION = 4,
 240     BLOB_KEY_GENERATOR_CURRENT_NUMBER = 5,
 241     MAX_SIMPLE_METADATA_TYPE = 6
 242   };
 243
 244   CONTENT_EXPORT static const int64 kAllBlobsKey;
 245   static const int64 kBlobKeyGeneratorInitialNumber;
 246   // All keys <= 0 are invalid.  This one's just a convenient example.
 247   static const int64 kInvalidBlobKey;
 248
 249   static bool IsValidBlobKey(int64 blob_key);
 250   CONTENT_EXPORT static std::string Encode(int64 database_id,
 251                                            MetaDataType type);
 252 };
 253
 254 class ObjectStoreMetaDataKey {
 255  public:
 256   enum MetaDataType {
 257     NAME = 0,
 258     KEY_PATH = 1,
 259     AUTO_INCREMENT = 2,
 260     EVICTABLE = 3,
 261     LAST_VERSION = 4,
 262     MAX_INDEX_ID = 5,
 263     HAS_KEY_PATH = 6,
 264     KEY_GENERATOR_CURRENT_NUMBER = 7
 265   };
 266
 267   ObjectStoreMetaDataKey();
 268   static bool Decode(base::StringPiece* slice, ObjectStoreMetaDataKey* result);
 269   CONTENT_EXPORT static std::string Encode(int64 database_id,
 270                                            int64 object_store_id,
 271                                            unsigned char meta_data_type);
 272   CONTENT_EXPORT static std::string EncodeMaxKey(int64 database_id);
 273   CONTENT_EXPORT static std::string EncodeMaxKey(int64 database_id,
 274                                                  int64 object_store_id);
 275   int64 ObjectStoreId() const;
 276   unsigned char MetaDataType() const;
 277   int Compare(const ObjectStoreMetaDataKey& other);
 278
 279  private:
 280   int64 object_store_id_;
 281   unsigned char meta_data_type_;
 282 };
 283
 284 class IndexMetaDataKey {
 285  public:
 286   enum MetaDataType {
 287     NAME = 0,
 288     UNIQUE = 1,
 289     KEY_PATH = 2,
 290     MULTI_ENTRY = 3
 291   };
 292
 293   IndexMetaDataKey();
 294   static bool Decode(base::StringPiece* slice, IndexMetaDataKey* result);
 295   CONTENT_EXPORT static std::string Encode(int64 database_id,
 296                                            int64 object_store_id,
 297                                            int64 index_id,
 298                                            unsigned char meta_data_type);
 299   CONTENT_EXPORT static std::string EncodeMaxKey(int64 database_id,
 300                                                  int64 object_store_id);
 301   CONTENT_EXPORT static std::string EncodeMaxKey(int64 database_id,
 302                                                  int64 object_store_id,
 303                                                  int64 index_id);
 304   int Compare(const IndexMetaDataKey& other);
 305   int64 IndexId() const;
 306   unsigned char meta_data_type() const { return meta_data_type_; }
 307
 308  private:
 309   int64 object_store_id_;
 310   int64 index_id_;
 311   unsigned char meta_data_type_;
 312 };
 313
 314 class ObjectStoreFreeListKey {
 315  public:
 316   ObjectStoreFreeListKey();
 317   static bool Decode(base::StringPiece* slice, ObjectStoreFreeListKey* result);
 318   CONTENT_EXPORT static std::string Encode(int64 database_id,
 319                                            int64 object_store_id);
 320   CONTENT_EXPORT static std::string EncodeMaxKey(int64 database_id);
 321   int64 ObjectStoreId() const;
 322   int Compare(const ObjectStoreFreeListKey& other);
 323
 324  private:
 325   int64 object_store_id_;
 326 };
 327
 328 class IndexFreeListKey {
 329  public:
 330   IndexFreeListKey();
 331   static bool Decode(base::StringPiece* slice, IndexFreeListKey* result);
 332   CONTENT_EXPORT static std::string Encode(int64 database_id,
 333                                            int64 object_store_id,
 334                                            int64 index_id);
 335   CONTENT_EXPORT static std::string EncodeMaxKey(int64 database_id,
 336                                                  int64 object_store_id);
 337   int Compare(const IndexFreeListKey& other);
 338   int64 ObjectStoreId() const;
 339   int64 IndexId() const;
 340
 341  private:
 342   int64 object_store_id_;
 343   int64 index_id_;
 344 };
 345
 346 class ObjectStoreNamesKey {
 347  public:
 348   // TODO(jsbell): We never use this to look up object store ids,
 349   // because a mapping is kept in the IndexedDBDatabase. Can the
 350   // mapping become unreliable?  Can we remove this?
 351   static bool Decode(base::StringPiece* slice, ObjectStoreNamesKey* result);
 352   CONTENT_EXPORT static std::string Encode(
 353       int64 database_id,
 354       const base::string16& object_store_name);
 355   int Compare(const ObjectStoreNamesKey& other);
 356   base::string16 object_store_name() const { return object_store_name_; }
 357
 358  private:
 359   // TODO(jsbell): Store the encoded string, or just pointers to it.
 360   base::string16 object_store_name_;
 361 };
 362
 363 class IndexNamesKey {
 364  public:
 365   IndexNamesKey();
 366   // TODO(jsbell): We never use this to look up index ids, because a mapping
 367   // is kept at a higher level.
 368   static bool Decode(base::StringPiece* slice, IndexNamesKey* result);
 369   CONTENT_EXPORT static std::string Encode(int64 database_id,
 370                                            int64 object_store_id,
 371                                            const base::string16& index_name);
 372   int Compare(const IndexNamesKey& other);
 373   base::string16 index_name() const { return index_name_; }
 374
 375  private:
 376   int64 object_store_id_;
 377   base::string16 index_name_;
 378 };
 379
 380 class ObjectStoreDataKey {
 381  public:
 382   static const int64 kSpecialIndexNumber;
 383
 384   ObjectStoreDataKey();
 385   ~ObjectStoreDataKey();
 386
 387   static bool Decode(base::StringPiece* slice, ObjectStoreDataKey* result);
 388   CONTENT_EXPORT static std::string Encode(int64 database_id,
 389                                            int64 object_store_id,
 390                                            const std::string encoded_user_key);
 391   static std::string Encode(int64 database_id,
 392                             int64 object_store_id,
 393                             const IndexedDBKey& user_key);
 394   scoped_ptr<IndexedDBKey> user_key() const;
 395  private:
 396   std::string encoded_user_key_;
 397 };
 398
 399 class ExistsEntryKey {
 400  public:
 401   ExistsEntryKey();
 402   ~ExistsEntryKey();
 403
 404   static bool Decode(base::StringPiece* slice, ExistsEntryKey* result);
 405   CONTENT_EXPORT static std::string Encode(int64 database_id,
 406                                            int64 object_store_id,
 407                                            const std::string& encoded_key);
 408   static std::string Encode(int64 database_id,
 409                             int64 object_store_id,
 410                             const IndexedDBKey& user_key);
 411   scoped_ptr<IndexedDBKey> user_key() const;
 412
 413  private:
 414   static const int64 kSpecialIndexNumber;
 415
 416   std::string encoded_user_key_;
 417   DISALLOW_COPY_AND_ASSIGN(ExistsEntryKey);
 418 };
 419
 420 class BlobEntryKey {
 421  public:
 422   BlobEntryKey() : database_id_(0), object_store_id_(0) {}
 423   static bool Decode(base::StringPiece* slice, BlobEntryKey* result);
 424   static bool FromObjectStoreDataKey(base::StringPiece* slice,
 425                                      BlobEntryKey* result);
 426   static std::string ReencodeToObjectStoreDataKey(base::StringPiece* slice);
 427   static std::string EncodeMinKeyForObjectStore(int64 database_id,
 428                                                 int64 object_store_id);
 429   static std::string EncodeStopKeyForObjectStore(int64 database_id,
 430                                                  int64 object_store_id);
 431   static std::string Encode(int64 database_id,
 432                             int64 object_store_id,
 433                             const IndexedDBKey& user_key);
 434   std::string Encode() const;
 435   int64 database_id() const { return database_id_; }
 436   int64 object_store_id() const { return object_store_id_; }
 437
 438  private:
 439   static const int64 kSpecialIndexNumber;
 440
 441   static std::string Encode(int64 database_id,
 442                             int64 object_store_id,
 443                             const std::string& encoded_user_key);
 444   int64 database_id_;
 445   int64 object_store_id_;
 446   // This is the user's ObjectStoreDataKey, not the BlobEntryKey itself.
 447   std::string encoded_user_key_;
 448 };
 449
 450 class IndexDataKey {
 451  public:
 452   IndexDataKey();
 453   ~IndexDataKey();
 454   static bool Decode(base::StringPiece* slice, IndexDataKey* result);
 455   CONTENT_EXPORT static std::string Encode(
 456       int64 database_id,
 457       int64 object_store_id,
 458       int64 index_id,
 459       const std::string& encoded_user_key,
 460       const std::string& encoded_primary_key,
 461       int64 sequence_number);
 462   static std::string Encode(int64 database_id,
 463                             int64 object_store_id,
 464                             int64 index_id,
 465                             const IndexedDBKey& user_key);
 466   static std::string Encode(int64 database_id,
 467                             int64 object_store_id,
 468                             int64 index_id,
 469                             const IndexedDBKey& user_key,
 470                             const IndexedDBKey& user_primary_key);
 471   static std::string EncodeMinKey(int64 database_id,
 472                                   int64 object_store_id,
 473                                   int64 index_id);
 474   CONTENT_EXPORT static std::string EncodeMaxKey(int64 database_id,
 475                                                  int64 object_store_id,
 476                                                  int64 index_id);
 477   int64 DatabaseId() const;
 478   int64 ObjectStoreId() const;
 479   int64 IndexId() const;
 480   scoped_ptr<IndexedDBKey> user_key() const;
 481   scoped_ptr<IndexedDBKey> primary_key() const;
 482
 483  private:
 484   int64 database_id_;
 485   int64 object_store_id_;
 486   int64 index_id_;
 487   std::string encoded_user_key_;
 488   std::string encoded_primary_key_;
 489   int64 sequence_number_;
 490
 491   DISALLOW_COPY_AND_ASSIGN(IndexDataKey);
 492 };
 493
 494 }  // namespace content
 495
 496 #endif  // CONTENT_BROWSER_INDEXED_DB_INDEXED_DB_LEVELDB_CODING_H_