db.h

   1 // Copyright (c) 2009-2010 Satoshi Nakamoto
   2 // Distributed under the MIT/X11 software license, see the accompanying
   3 // file license.txt or http://www.opensource.org/licenses/mit-license.php.
   4
   5 class CTransaction;
   6 class CTxIndex;
   7 class CDiskBlockIndex;
   8 class CDiskTxPos;
   9 class COutPoint;
  10 class CUser;
  11 class CReview;
  12 class CAddress;
  13 class CWalletTx;
  14 class CAccount;
  15 class CAccountingEntry;
  16
  17 extern map<string, string> mapAddressBook;
  18 extern CCriticalSection cs_mapAddressBook;
  19 extern vector<unsigned char> vchDefaultKey;
  20 extern bool fClient;
  21 extern int nBestHeight;
  22
  23
  24 extern unsigned int nWalletDBUpdated;
  25 extern DbEnv dbenv;
  26
  27
  28 extern void DBFlush(bool fShutdown);
  29 extern vector<unsigned char> GetKeyFromKeyPool();
  30 extern int64 GetOldestKeyPoolTime();
  31
  32
  33
  34
  35 class CDB
  36 {
  37 protected:
  38     Db* pdb;
  39     string strFile;
  40     vector<DbTxn*> vTxn;
  41     bool fReadOnly;
  42
  43     explicit CDB(const char* pszFile, const char* pszMode="r+");
  44     ~CDB() { Close(); }
  45 public:
  46     void Close();
  47 private:
  48     CDB(const CDB&);
  49     void operator=(const CDB&);
  50
  51 protected:
  52     template<typename K, typename T>
  53     bool Read(const K& key, T& value)
  54     {
  55         if (!pdb)
  56             return false;
  57
  58         // Key
  59         CDataStream ssKey(SER_DISK);
  60         ssKey.reserve(1000);
  61         ssKey << key;
  62         Dbt datKey(&ssKey[0], ssKey.size());
  63
  64         // Read
  65         Dbt datValue;
  66         datValue.set_flags(DB_DBT_MALLOC);
  67         int ret = pdb->get(GetTxn(), &datKey, &datValue, 0);
  68         memset(datKey.get_data(), 0, datKey.get_size());
  69         if (datValue.get_data() == NULL)
  70             return false;
  71
  72         // Unserialize value
  73         CDataStream ssValue((char*)datValue.get_data(), (char*)datValue.get_data() + datValue.get_size(), SER_DISK);
  74         ssValue >> value;
  75
  76         // Clear and free memory
  77         memset(datValue.get_data(), 0, datValue.get_size());
  78         free(datValue.get_data());
  79         return (ret == 0);
  80     }
  81
  82     template<typename K, typename T>
  83     bool Write(const K& key, const T& value, bool fOverwrite=true)
  84     {
  85         if (!pdb)
  86             return false;
  87         if (fReadOnly)
  88             assert(("Write called on database in read-only mode", false));
  89
  90         // Key
  91         CDataStream ssKey(SER_DISK);
  92         ssKey.reserve(1000);
  93         ssKey << key;
  94         Dbt datKey(&ssKey[0], ssKey.size());
  95
  96         // Value
  97         CDataStream ssValue(SER_DISK);
  98         ssValue.reserve(10000);
  99         ssValue << value;
 100         Dbt datValue(&ssValue[0], ssValue.size());
 101
 102         // Write
 103         int ret = pdb->put(GetTxn(), &datKey, &datValue, (fOverwrite ? 0 : DB_NOOVERWRITE));
 104
 105         // Clear memory in case it was a private key
 106         memset(datKey.get_data(), 0, datKey.get_size());
 107         memset(datValue.get_data(), 0, datValue.get_size());
 108         return (ret == 0);
 109     }
 110
 111     template<typename K>
 112     bool Erase(const K& key)
 113     {
 114         if (!pdb)
 115             return false;
 116         if (fReadOnly)
 117             assert(("Erase called on database in read-only mode", false));
 118
 119         // Key
 120         CDataStream ssKey(SER_DISK);
 121         ssKey.reserve(1000);
 122         ssKey << key;
 123         Dbt datKey(&ssKey[0], ssKey.size());
 124
 125         // Erase
 126         int ret = pdb->del(GetTxn(), &datKey, 0);
 127
 128         // Clear memory
 129         memset(datKey.get_data(), 0, datKey.get_size());
 130         return (ret == 0 || ret == DB_NOTFOUND);
 131     }
 132
 133     template<typename K>
 134     bool Exists(const K& key)
 135     {
 136         if (!pdb)
 137             return false;
 138
 139         // Key
 140         CDataStream ssKey(SER_DISK);
 141         ssKey.reserve(1000);
 142         ssKey << key;
 143         Dbt datKey(&ssKey[0], ssKey.size());
 144
 145         // Exists
 146         int ret = pdb->exists(GetTxn(), &datKey, 0);
 147
 148         // Clear memory
 149         memset(datKey.get_data(), 0, datKey.get_size());
 150         return (ret == 0);
 151     }
 152
 153     Dbc* GetCursor()
 154     {
 155         if (!pdb)
 156             return NULL;
 157         Dbc* pcursor = NULL;
 158         int ret = pdb->cursor(NULL, &pcursor, 0);
 159         if (ret != 0)
 160             return NULL;
 161         return pcursor;
 162     }
 163
 164     int ReadAtCursor(Dbc* pcursor, CDataStream& ssKey, CDataStream& ssValue, unsigned int fFlags=DB_NEXT)
 165     {
 166         // Read at cursor
 167         Dbt datKey;
 168         if (fFlags == DB_SET || fFlags == DB_SET_RANGE || fFlags == DB_GET_BOTH || fFlags == DB_GET_BOTH_RANGE)
 169         {
 170             datKey.set_data(&ssKey[0]);
 171             datKey.set_size(ssKey.size());
 172         }
 173         Dbt datValue;
 174         if (fFlags == DB_GET_BOTH || fFlags == DB_GET_BOTH_RANGE)
 175         {
 176             datValue.set_data(&ssValue[0]);
 177             datValue.set_size(ssValue.size());
 178         }
 179         datKey.set_flags(DB_DBT_MALLOC);
 180         datValue.set_flags(DB_DBT_MALLOC);
 181         int ret = pcursor->get(&datKey, &datValue, fFlags);
 182         if (ret != 0)
 183             return ret;
 184         else if (datKey.get_data() == NULL || datValue.get_data() == NULL)
 185             return 99999;
 186
 187         // Convert to streams
 188         ssKey.SetType(SER_DISK);
 189         ssKey.clear();
 190         ssKey.write((char*)datKey.get_data(), datKey.get_size());
 191         ssValue.SetType(SER_DISK);
 192         ssValue.clear();
 193         ssValue.write((char*)datValue.get_data(), datValue.get_size());
 194
 195         // Clear and free memory
 196         memset(datKey.get_data(), 0, datKey.get_size());
 197         memset(datValue.get_data(), 0, datValue.get_size());
 198         free(datKey.get_data());
 199         free(datValue.get_data());
 200         return 0;
 201     }
 202
 203     DbTxn* GetTxn()
 204     {
 205         if (!vTxn.empty())
 206             return vTxn.back();
 207         else
 208             return NULL;
 209     }
 210
 211 public:
 212     bool TxnBegin()
 213     {
 214         if (!pdb)
 215             return false;
 216         DbTxn* ptxn = NULL;
 217         int ret = dbenv.txn_begin(GetTxn(), &ptxn, DB_TXN_NOSYNC);
 218         if (!ptxn || ret != 0)
 219             return false;
 220         vTxn.push_back(ptxn);
 221         return true;
 222     }
 223
 224     bool TxnCommit()
 225     {
 226         if (!pdb)
 227             return false;
 228         if (vTxn.empty())
 229             return false;
 230         int ret = vTxn.back()->commit(0);
 231         vTxn.pop_back();
 232         return (ret == 0);
 233     }
 234
 235     bool TxnAbort()
 236     {
 237         if (!pdb)
 238             return false;
 239         if (vTxn.empty())
 240             return false;
 241         int ret = vTxn.back()->abort();
 242         vTxn.pop_back();
 243         return (ret == 0);
 244     }
 245
 246     bool ReadVersion(int& nVersion)
 247     {
 248         nVersion = 0;
 249         return Read(string("version"), nVersion);
 250     }
 251
 252     bool WriteVersion(int nVersion)
 253     {
 254         return Write(string("version"), nVersion);
 255     }
 256 };
 257
 258
 259
 260
 261
 262
 263
 264
 265 class CTxDB : public CDB
 266 {
 267 public:
 268     CTxDB(const char* pszMode="r+") : CDB("blkindex.dat", pszMode) { }
 269 private:
 270     CTxDB(const CTxDB&);
 271     void operator=(const CTxDB&);
 272 public:
 273     bool ReadTxIndex(uint256 hash, CTxIndex& txindex);
 274     bool UpdateTxIndex(uint256 hash, const CTxIndex& txindex);
 275     bool AddTxIndex(const CTransaction& tx, const CDiskTxPos& pos, int nHeight);
 276     bool EraseTxIndex(const CTransaction& tx);
 277     bool ContainsTx(uint256 hash);
 278     bool ReadOwnerTxes(uint160 hash160, int nHeight, vector<CTransaction>& vtx);
 279     bool ReadDiskTx(uint256 hash, CTransaction& tx, CTxIndex& txindex);
 280     bool ReadDiskTx(uint256 hash, CTransaction& tx);
 281     bool ReadDiskTx(COutPoint outpoint, CTransaction& tx, CTxIndex& txindex);
 282     bool ReadDiskTx(COutPoint outpoint, CTransaction& tx);
 283     bool WriteBlockIndex(const CDiskBlockIndex& blockindex);
 284     bool EraseBlockIndex(uint256 hash);
 285     bool ReadHashBestChain(uint256& hashBestChain);
 286     bool WriteHashBestChain(uint256 hashBestChain);
 287     bool ReadBestInvalidWork(CBigNum& bnBestInvalidWork);
 288     bool WriteBestInvalidWork(CBigNum bnBestInvalidWork);
 289     bool LoadBlockIndex();
 290 };
 291
 292
 293
 294
 295
 296 class CAddrDB : public CDB
 297 {
 298 public:
 299     CAddrDB(const char* pszMode="r+") : CDB("addr.dat", pszMode) { }
 300 private:
 301     CAddrDB(const CAddrDB&);
 302     void operator=(const CAddrDB&);
 303 public:
 304     bool WriteAddress(const CAddress& addr);
 305     bool EraseAddress(const CAddress& addr);
 306     bool LoadAddresses();
 307 };
 308
 309 bool LoadAddresses();
 310
 311
 312
 313
 314
 315
 316 class CKeyPool
 317 {
 318 public:
 319     int64 nTime;
 320     vector<unsigned char> vchPubKey;
 321
 322     CKeyPool()
 323     {
 324         nTime = GetTime();
 325     }
 326
 327     CKeyPool(const vector<unsigned char>& vchPubKeyIn)
 328     {
 329         nTime = GetTime();
 330         vchPubKey = vchPubKeyIn;
 331     }
 332
 333     IMPLEMENT_SERIALIZE
 334     (
 335         if (!(nType & SER_GETHASH))
 336             READWRITE(nVersion);
 337         READWRITE(nTime);
 338         READWRITE(vchPubKey);
 339     )
 340 };
 341
 342
 343
 344
 345 class CWalletDB : public CDB
 346 {
 347 public:
 348     CWalletDB(const char* pszMode="r+") : CDB("wallet.dat", pszMode)
 349     {
 350     }
 351 private:
 352     CWalletDB(const CWalletDB&);
 353     void operator=(const CWalletDB&);
 354 public:
 355     bool ReadName(const string& strAddress, string& strName)
 356     {
 357         strName = "";
 358         return Read(make_pair(string("name"), strAddress), strName);
 359     }
 360
 361     bool WriteName(const string& strAddress, const string& strName)
 362     {
 363         CRITICAL_BLOCK(cs_mapAddressBook)
 364             mapAddressBook[strAddress] = strName;
 365         nWalletDBUpdated++;
 366         return Write(make_pair(string("name"), strAddress), strName);
 367     }
 368
 369     bool EraseName(const string& strAddress)
 370     {
 371         // This should only be used for sending addresses, never for receiving addresses,
 372         // receiving addresses must always have an address book entry if they're not change return.
 373         CRITICAL_BLOCK(cs_mapAddressBook)
 374             mapAddressBook.erase(strAddress);
 375         nWalletDBUpdated++;
 376         return Erase(make_pair(string("name"), strAddress));
 377     }
 378
 379     bool ReadTx(uint256 hash, CWalletTx& wtx)
 380     {
 381         return Read(make_pair(string("tx"), hash), wtx);
 382     }
 383
 384     bool WriteTx(uint256 hash, const CWalletTx& wtx)
 385     {
 386         nWalletDBUpdated++;
 387         return Write(make_pair(string("tx"), hash), wtx);
 388     }
 389
 390     bool EraseTx(uint256 hash)
 391     {
 392         nWalletDBUpdated++;
 393         return Erase(make_pair(string("tx"), hash));
 394     }
 395
 396     bool ReadKey(const vector<unsigned char>& vchPubKey, CPrivKey& vchPrivKey)
 397     {
 398         vchPrivKey.clear();
 399         return Read(make_pair(string("key"), vchPubKey), vchPrivKey);
 400     }
 401
 402     bool WriteKey(const vector<unsigned char>& vchPubKey, const CPrivKey& vchPrivKey)
 403     {
 404         nWalletDBUpdated++;
 405         return Write(make_pair(string("key"), vchPubKey), vchPrivKey, false);
 406     }
 407
 408     bool ReadDefaultKey(vector<unsigned char>& vchPubKey)
 409     {
 410         vchPubKey.clear();
 411         return Read(string("defaultkey"), vchPubKey);
 412     }
 413
 414     bool WriteDefaultKey(const vector<unsigned char>& vchPubKey)
 415     {
 416         vchDefaultKey = vchPubKey;
 417         nWalletDBUpdated++;
 418         return Write(string("defaultkey"), vchPubKey);
 419     }
 420
 421     template<typename T>
 422     bool ReadSetting(const string& strKey, T& value)
 423     {
 424         return Read(make_pair(string("setting"), strKey), value);
 425     }
 426
 427     template<typename T>
 428     bool WriteSetting(const string& strKey, const T& value)
 429     {
 430         nWalletDBUpdated++;
 431         return Write(make_pair(string("setting"), strKey), value);
 432     }
 433
 434     bool ReadAccount(const string& strAccount, CAccount& account);
 435     bool WriteAccount(const string& strAccount, const CAccount& account);
 436     bool WriteAccountingEntry(const CAccountingEntry& acentry);
 437     int64 GetAccountCreditDebit(const string& strAccount);
 438     void ListAccountCreditDebit(const string& strAccount, list<CAccountingEntry>& acentries);
 439
 440     bool LoadWallet();
 441 protected:
 442     void ReserveKeyFromKeyPool(int64& nIndex, CKeyPool& keypool);
 443     void KeepKey(int64 nIndex);
 444     static void ReturnKey(int64 nIndex);
 445     friend class CReserveKey;
 446     friend vector<unsigned char> GetKeyFromKeyPool();
 447     friend int64 GetOldestKeyPoolTime();
 448 };
 449
 450 bool LoadWallet(bool& fFirstRunRet);
 451 void BackupWallet(const string& strDest);
 452
 453 inline bool SetAddressBookName(const string& strAddress, const string& strName)
 454 {
 455     return CWalletDB().WriteName(strAddress, strName);
 456 }
 457
 458 class CReserveKey
 459 {
 460 protected:
 461     int64 nIndex;
 462     vector<unsigned char> vchPubKey;
 463 public:
 464     CReserveKey()
 465     {
 466         nIndex = -1;
 467     }
 468
 469     ~CReserveKey()
 470     {
 471         if (!fShutdown)
 472             ReturnKey();
 473     }
 474
 475     vector<unsigned char> GetReservedKey()
 476     {
 477         if (nIndex == -1)
 478         {
 479             CKeyPool keypool;
 480             CWalletDB().ReserveKeyFromKeyPool(nIndex, keypool);
 481             vchPubKey = keypool.vchPubKey;
 482         }
 483         assert(!vchPubKey.empty());
 484         return vchPubKey;
 485     }
 486
 487     void KeepKey()
 488     {
 489         if (nIndex != -1)
 490             CWalletDB().KeepKey(nIndex);
 491         nIndex = -1;
 492         vchPubKey.clear();
 493     }
 494
 495     void ReturnKey()
 496     {
 497         if (nIndex != -1)
 498             CWalletDB::ReturnKey(nIndex);
 499         nIndex = -1;
 500         vchPubKey.clear();
 501     }
 502 };