aboutsummaryrefslogtreecommitdiff
path: root/src/wallet.h
blob: c1461b1feb5106f629556ae233ab64eb0ce5329b (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
// Copyright (c) 2009-2010 Satoshi Nakamoto
// Copyright (c) 2009-2012 The Bitcoin developers
// Distributed under the MIT/X11 software license, see the accompanying
// file license.txt or http://www.opensource.org/licenses/mit-license.php.
#ifndef BITCOIN_WALLET_H
#define BITCOIN_WALLET_H

#include "main.h"
#include "key.h"
#include "keystore.h"
#include "script.h"

class CWalletTx;
class CReserveKey;
class CWalletDB;

/** (client) version numbers for particular wallet features */
enum WalletFeature
{
    FEATURE_BASE = 10500, // the earliest version new wallets supports (only useful for getinfo's clientversion output)

    FEATURE_WALLETCRYPT = 40000, // wallet encryption
    FEATURE_COMPRPUBKEY = 60000, // compressed public keys

    FEATURE_LATEST = 60000
};


/** A key pool entry */
class CKeyPool
{
public:
    int64 nTime;
    std::vector<unsigned char> vchPubKey;

    CKeyPool()
    {
        nTime = GetTime();
    }

    CKeyPool(const std::vector<unsigned char>& vchPubKeyIn)
    {
        nTime = GetTime();
        vchPubKey = vchPubKeyIn;
    }

    IMPLEMENT_SERIALIZE
    (
        if (!(nType & SER_GETHASH))
            READWRITE(nVersion);
        READWRITE(nTime);
        READWRITE(vchPubKey);
    )
};

/** A CWallet is an extension of a keystore, which also maintains a set of transactions and balances,
 * and provides the ability to create new transactions.
 */
class CWallet : public CCryptoKeyStore
{
private:
    bool SelectCoinsMinConf(int64 nTargetValue, int nConfMine, int nConfTheirs, std::set<std::pair<const CWalletTx*,unsigned int> >& setCoinsRet, int64& nValueRet) const;
    bool SelectCoins(int64 nTargetValue, std::set<std::pair<const CWalletTx*,unsigned int> >& setCoinsRet, int64& nValueRet) const;

    CWalletDB *pwalletdbEncryption;

    // the current wallet version: clients below this version are not able to load the wallet
    int nWalletVersion;

    // the maxmimum wallet format version: memory-only variable that specifies to what version this wallet may be upgraded
    int nWalletMaxVersion;

public:
    mutable CCriticalSection cs_wallet;

    bool fFileBacked;
    std::string strWalletFile;

    std::set<int64> setKeyPool;


    typedef std::map<unsigned int, CMasterKey> MasterKeyMap;
    MasterKeyMap mapMasterKeys;
    unsigned int nMasterKeyMaxID;

    CWallet()
    {
        nWalletVersion = FEATURE_BASE;
        nWalletMaxVersion = FEATURE_BASE;
        fFileBacked = false;
        nMasterKeyMaxID = 0;
        pwalletdbEncryption = NULL;
    }
    CWallet(std::string strWalletFileIn)
    {
        nWalletVersion = FEATURE_BASE;
        nWalletMaxVersion = FEATURE_BASE;
        strWalletFile = strWalletFileIn;
        fFileBacked = true;
        nMasterKeyMaxID = 0;
        pwalletdbEncryption = NULL;
    }

    std::map<uint256, CWalletTx> mapWallet;
    std::vector<uint256> vWalletUpdated;

    std::map<uint256, int> mapRequestCount;

    std::map<CBitcoinAddress, std::string> mapAddressBook;

    std::vector<unsigned char> vchDefaultKey;

    // check whether we are allowed to upgrade (or already support) to the named feature
    bool CanSupportFeature(enum WalletFeature wf) { return nWalletMaxVersion >= wf; }

    // keystore implementation
    // Generate a new key
    std::vector<unsigned char> GenerateNewKey();
    // Adds a key to the store, and saves it to disk.
    bool AddKey(const CKey& key);
    // Adds a key to the store, without saving it to disk (used by LoadWallet)
    bool LoadKey(const CKey& key) { return CCryptoKeyStore::AddKey(key); }

    bool LoadMinVersion(int nVersion) { nWalletVersion = nVersion; nWalletMaxVersion = std::max(nWalletMaxVersion, nVersion); return true; }

    // Adds an encrypted key to the store, and saves it to disk.
    bool AddCryptedKey(const std::vector<unsigned char> &vchPubKey, const std::vector<unsigned char> &vchCryptedSecret);
    // Adds an encrypted key to the store, without saving it to disk (used by LoadWallet)
    bool LoadCryptedKey(const std::vector<unsigned char> &vchPubKey, const std::vector<unsigned char> &vchCryptedSecret) { SetMinVersion(FEATURE_WALLETCRYPT); return CCryptoKeyStore::AddCryptedKey(vchPubKey, vchCryptedSecret); }
    bool AddCScript(const CScript& redeemScript);
    bool LoadCScript(const CScript& redeemScript) { return CCryptoKeyStore::AddCScript(redeemScript); }

    bool Unlock(const SecureString& strWalletPassphrase);
    bool ChangeWalletPassphrase(const SecureString& strOldWalletPassphrase, const SecureString& strNewWalletPassphrase);
    bool EncryptWallet(const SecureString& strWalletPassphrase);

    void MarkDirty();
    bool AddToWallet(const CWalletTx& wtxIn);
    bool AddToWalletIfInvolvingMe(const CTransaction& tx, const CBlock* pblock, bool fUpdate = false, bool fFindBlock = false);
    bool EraseFromWallet(uint256 hash);
    void WalletUpdateSpent(const CTransaction& prevout);
    int ScanForWalletTransactions(CBlockIndex* pindexStart, bool fUpdate = false);
    int ScanForWalletTransaction(const uint256& hashTx);
    void ReacceptWalletTransactions();
    void ResendWalletTransactions();
    int64 GetBalance() const;
    int64 GetUnconfirmedBalance() const;
    bool CreateTransaction(const std::vector<std::pair<CScript, int64> >& vecSend, CWalletTx& wtxNew, CReserveKey& reservekey, int64& nFeeRet);
    bool CreateTransaction(CScript scriptPubKey, int64 nValue, CWalletTx& wtxNew, CReserveKey& reservekey, int64& nFeeRet);
    bool CommitTransaction(CWalletTx& wtxNew, CReserveKey& reservekey);
    std::string SendMoney(CScript scriptPubKey, int64 nValue, CWalletTx& wtxNew, bool fAskFee=false);
    std::string SendMoneyToBitcoinAddress(const CBitcoinAddress& address, int64 nValue, CWalletTx& wtxNew, bool fAskFee=false);

    bool NewKeyPool();
    bool TopUpKeyPool();
    int64 AddReserveKey(const CKeyPool& keypool);
    void ReserveKeyFromKeyPool(int64& nIndex, CKeyPool& keypool);
    void KeepKey(int64 nIndex);
    void ReturnKey(int64 nIndex);
    bool GetKeyFromPool(std::vector<unsigned char> &key, bool fAllowReuse=true);
    int64 GetOldestKeyPoolTime();
    void GetAllReserveAddresses(std::set<CBitcoinAddress>& setAddress);

    bool IsMine(const CTxIn& txin) const;
    int64 GetDebit(const CTxIn& txin) const;
    bool IsMine(const CTxOut& txout) const
    {
        return ::IsMine(*this, txout.scriptPubKey);
    }
    int64 GetCredit(const CTxOut& txout) const
    {
        if (!MoneyRange(txout.nValue))
            throw std::runtime_error("CWallet::GetCredit() : value out of range");
        return (IsMine(txout) ? txout.nValue : 0);
    }
    bool IsChange(const CTxOut& txout) const;
    int64 GetChange(const CTxOut& txout) const
    {
        if (!MoneyRange(txout.nValue))
            throw std::runtime_error("CWallet::GetChange() : value out of range");
        return (IsChange(txout) ? txout.nValue : 0);
    }
    bool IsMine(const CTransaction& tx) const
    {
        BOOST_FOREACH(const CTxOut& txout, tx.vout)
            if (IsMine(txout))
                return true;
        return false;
    }
    bool IsFromMe(const CTransaction& tx) const
    {
        return (GetDebit(tx) > 0);
    }
    int64 GetDebit(const CTransaction& tx) const
    {
        int64 nDebit = 0;
        BOOST_FOREACH(const CTxIn& txin, tx.vin)
        {
            nDebit += GetDebit(txin);
            if (!MoneyRange(nDebit))
                throw std::runtime_error("CWallet::GetDebit() : value out of range");
        }
        return nDebit;
    }
    int64 GetCredit(const CTransaction& tx) const
    {
        int64 nCredit = 0;
        BOOST_FOREACH(const CTxOut& txout, tx.vout)
        {
            nCredit += GetCredit(txout);
            if (!MoneyRange(nCredit))
                throw std::runtime_error("CWallet::GetCredit() : value out of range");
        }
        return nCredit;
    }
    int64 GetChange(const CTransaction& tx) const
    {
        int64 nChange = 0;
        BOOST_FOREACH(const CTxOut& txout, tx.vout)
        {
            nChange += GetChange(txout);
            if (!MoneyRange(nChange))
                throw std::runtime_error("CWallet::GetChange() : value out of range");
        }
        return nChange;
    }
    void SetBestChain(const CBlockLocator& loc);

    int LoadWallet(bool& fFirstRunRet);
//    bool BackupWallet(const std::string& strDest);

    bool SetAddressBookName(const CBitcoinAddress& address, const std::string& strName);

    bool DelAddressBookName(const CBitcoinAddress& address);

    void UpdatedTransaction(const uint256 &hashTx)
    {
        {
            LOCK(cs_wallet);
            vWalletUpdated.push_back(hashTx);
        }
    }

    void PrintWallet(const CBlock& block);

    void Inventory(const uint256 &hash)
    {
        {
            LOCK(cs_wallet);
            std::map<uint256, int>::iterator mi = mapRequestCount.find(hash);
            if (mi != mapRequestCount.end())
                (*mi).second++;
        }
    }

    int GetKeyPoolSize()
    {
        return setKeyPool.size();
    }

    bool GetTransaction(const uint256 &hashTx, CWalletTx& wtx);

    bool SetDefaultKey(const std::vector<unsigned char> &vchPubKey);

    // signify that a particular wallet feature is now used. this may change nWalletVersion and nWalletMaxVersion if those are lower
    bool SetMinVersion(enum WalletFeature, CWalletDB* pwalletdbIn = NULL, bool fExplicit = false);

    // change which version we're allowed to upgrade to (note that this does not immediately imply upgrading to that format)
    bool SetMaxVersion(int nVersion);

    // get the current wallet format (the oldest client version guaranteed to understand this wallet)
    int GetVersion() { return nWalletVersion; }
};

/** A key allocated from the key pool. */
class CReserveKey
{
protected:
    CWallet* pwallet;
    int64 nIndex;
    std::vector<unsigned char> vchPubKey;
public:
    CReserveKey(CWallet* pwalletIn)
    {
        nIndex = -1;
        pwallet = pwalletIn;
    }

    ~CReserveKey()
    {
        if (!fShutdown)
            ReturnKey();
    }

    void ReturnKey();
    std::vector<unsigned char> GetReservedKey();
    void KeepKey();
};


/** A transaction with a bunch of additional info that only the owner cares about. 
 * It includes any unrecorded transactions needed to link it back to the block chain.
 */
class CWalletTx : public CMerkleTx
{
private:
    const CWallet* pwallet;

public:
    std::vector<CMerkleTx> vtxPrev;
    std::map<std::string, std::string> mapValue;
    std::vector<std::pair<std::string, std::string> > vOrderForm;
    unsigned int fTimeReceivedIsTxTime;
    unsigned int nTimeReceived;  // time received by this node
    char fFromMe;
    std::string strFromAccount;
    std::vector<char> vfSpent; // which outputs are already spent

    // memory only
    mutable char fDebitCached;
    mutable char fCreditCached;
    mutable char fAvailableCreditCached;
    mutable char fChangeCached;
    mutable int64 nDebitCached;
    mutable int64 nCreditCached;
    mutable int64 nAvailableCreditCached;
    mutable int64 nChangeCached;

    // memory only UI hints
    mutable unsigned int nTimeDisplayed;
    mutable int nLinesDisplayed;
    mutable char fConfirmedDisplayed;

    CWalletTx()
    {
        Init(NULL);
    }

    CWalletTx(const CWallet* pwalletIn)
    {
        Init(pwalletIn);
    }

    CWalletTx(const CWallet* pwalletIn, const CMerkleTx& txIn) : CMerkleTx(txIn)
    {
        Init(pwalletIn);
    }

    CWalletTx(const CWallet* pwalletIn, const CTransaction& txIn) : CMerkleTx(txIn)
    {
        Init(pwalletIn);
    }

    void Init(const CWallet* pwalletIn)
    {
        pwallet = pwalletIn;
        vtxPrev.clear();
        mapValue.clear();
        vOrderForm.clear();
        fTimeReceivedIsTxTime = false;
        nTimeReceived = 0;
        fFromMe = false;
        strFromAccount.clear();
        vfSpent.clear();
        fDebitCached = false;
        fCreditCached = false;
        fAvailableCreditCached = false;
        fChangeCached = false;
        nDebitCached = 0;
        nCreditCached = 0;
        nAvailableCreditCached = 0;
        nChangeCached = 0;
        nTimeDisplayed = 0;
        nLinesDisplayed = 0;
        fConfirmedDisplayed = false;
    }

    IMPLEMENT_SERIALIZE
    (
        CWalletTx* pthis = const_cast<CWalletTx*>(this);
        if (fRead)
            pthis->Init(NULL);
        char fSpent = false;

        if (!fRead)
        {
            pthis->mapValue["fromaccount"] = pthis->strFromAccount;

            std::string str;
            BOOST_FOREACH(char f, vfSpent)
            {
                str += (f ? '1' : '0');
                if (f)
                    fSpent = true;
            }
            pthis->mapValue["spent"] = str;
        }

        nSerSize += SerReadWrite(s, *(CMerkleTx*)this, nType, nVersion,ser_action);
        READWRITE(vtxPrev);
        READWRITE(mapValue);
        READWRITE(vOrderForm);
        READWRITE(fTimeReceivedIsTxTime);
        READWRITE(nTimeReceived);
        READWRITE(fFromMe);
        READWRITE(fSpent);

        if (fRead)
        {
            pthis->strFromAccount = pthis->mapValue["fromaccount"];

            if (mapValue.count("spent"))
                BOOST_FOREACH(char c, pthis->mapValue["spent"])
                    pthis->vfSpent.push_back(c != '0');
            else
                pthis->vfSpent.assign(vout.size(), fSpent);
        }

        pthis->mapValue.erase("fromaccount");
        pthis->mapValue.erase("version");
        pthis->mapValue.erase("spent");
    )

    // marks certain txout's as spent
    // returns true if any update took place
    bool UpdateSpent(const std::vector<char>& vfNewSpent)
    {
        bool fReturn = false;
        for (unsigned int i = 0; i < vfNewSpent.size(); i++)
        {
            if (i == vfSpent.size())
                break;

            if (vfNewSpent[i] && !vfSpent[i])
            {
                vfSpent[i] = true;
                fReturn = true;
                fAvailableCreditCached = false;
            }
        }
        return fReturn;
    }

    // make sure balances are recalculated
    void MarkDirty()
    {
        fCreditCached = false;
        fAvailableCreditCached = false;
        fDebitCached = false;
        fChangeCached = false;
    }

    void BindWallet(CWallet *pwalletIn)
    {
        pwallet = pwalletIn;
        MarkDirty();
    }

    void MarkSpent(unsigned int nOut)
    {
        if (nOut >= vout.size())
            throw std::runtime_error("CWalletTx::MarkSpent() : nOut out of range");
        vfSpent.resize(vout.size());
        if (!vfSpent[nOut])
        {
            vfSpent[nOut] = true;
            fAvailableCreditCached = false;
        }
    }

    bool IsSpent(unsigned int nOut) const
    {
        if (nOut >= vout.size())
            throw std::runtime_error("CWalletTx::IsSpent() : nOut out of range");
        if (nOut >= vfSpent.size())
            return false;
        return (!!vfSpent[nOut]);
    }

    int64 GetDebit() const
    {
        if (vin.empty())
            return 0;
        if (fDebitCached)
            return nDebitCached;
        nDebitCached = pwallet->GetDebit(*this);
        fDebitCached = true;
        return nDebitCached;
    }

    int64 GetCredit(bool fUseCache=true) const
    {
        // Must wait until coinbase is safely deep enough in the chain before valuing it
        if (IsCoinBase() && GetBlocksToMaturity() > 0)
            return 0;

        // GetBalance can assume transactions in mapWallet won't change
        if (fUseCache && fCreditCached)
            return nCreditCached;
        nCreditCached = pwallet->GetCredit(*this);
        fCreditCached = true;
        return nCreditCached;
    }

    int64 GetAvailableCredit(bool fUseCache=true) const
    {
        // Must wait until coinbase is safely deep enough in the chain before valuing it
        if (IsCoinBase() && GetBlocksToMaturity() > 0)
            return 0;

        if (fUseCache && fAvailableCreditCached)
            return nAvailableCreditCached;

        int64 nCredit = 0;
        for (unsigned int i = 0; i < vout.size(); i++)
        {
            if (!IsSpent(i))
            {
                const CTxOut &txout = vout[i];
                nCredit += pwallet->GetCredit(txout);
                if (!MoneyRange(nCredit))
                    throw std::runtime_error("CWalletTx::GetAvailableCredit() : value out of range");
            }
        }

        nAvailableCreditCached = nCredit;
        fAvailableCreditCached = true;
        return nCredit;
    }


    int64 GetChange() const
    {
        if (fChangeCached)
            return nChangeCached;
        nChangeCached = pwallet->GetChange(*this);
        fChangeCached = true;
        return nChangeCached;
    }

    void GetAmounts(int64& nGeneratedImmature, int64& nGeneratedMature, std::list<std::pair<CBitcoinAddress, int64> >& listReceived,
                    std::list<std::pair<CBitcoinAddress, int64> >& listSent, int64& nFee, std::string& strSentAccount) const;

    void GetAccountAmounts(const std::string& strAccount, int64& nGenerated, int64& nReceived, 
                           int64& nSent, int64& nFee) const;

    bool IsFromMe() const
    {
        return (GetDebit() > 0);
    }

    bool IsConfirmed() const
    {
        // Quick answer in most cases
        if (!IsFinal())
            return false;
        if (GetDepthInMainChain() >= 1)
            return true;
        if (!IsFromMe()) // using wtx's cached debit
            return false;

        // If no confirmations but it's from us, we can still
        // consider it confirmed if all dependencies are confirmed
        std::map<uint256, const CMerkleTx*> mapPrev;
        std::vector<const CMerkleTx*> vWorkQueue;
        vWorkQueue.reserve(vtxPrev.size()+1);
        vWorkQueue.push_back(this);
        for (unsigned int i = 0; i < vWorkQueue.size(); i++)
        {
            const CMerkleTx* ptx = vWorkQueue[i];

            if (!ptx->IsFinal())
                return false;
            if (ptx->GetDepthInMainChain() >= 1)
                continue;
            if (!pwallet->IsFromMe(*ptx))
                return false;

            if (mapPrev.empty())
            {
                BOOST_FOREACH(const CMerkleTx& tx, vtxPrev)
                    mapPrev[tx.GetHash()] = &tx;
            }

            BOOST_FOREACH(const CTxIn& txin, ptx->vin)
            {
                if (!mapPrev.count(txin.prevout.hash))
                    return false;
                vWorkQueue.push_back(mapPrev[txin.prevout.hash]);
            }
        }
        return true;
    }

    bool WriteToDisk();

    int64 GetTxTime() const;
    int GetRequestCount() const;

    void AddSupportingTransactions(CTxDB& txdb);

    bool AcceptWalletTransaction(CTxDB& txdb, bool fCheckInputs=true);
    bool AcceptWalletTransaction();

    void RelayWalletTransaction(CTxDB& txdb);
    void RelayWalletTransaction();
};


/** Private key that includes an expiration date in case it never gets used. */
class CWalletKey
{
public:
    CPrivKey vchPrivKey;
    int64 nTimeCreated;
    int64 nTimeExpires;
    std::string strComment;
    //// todo: add something to note what created it (user, getnewaddress, change)
    ////   maybe should have a map<string, string> property map

    CWalletKey(int64 nExpires=0)
    {
        nTimeCreated = (nExpires ? GetTime() : 0);
        nTimeExpires = nExpires;
    }

    IMPLEMENT_SERIALIZE
    (
        if (!(nType & SER_GETHASH))
            READWRITE(nVersion);
        READWRITE(vchPrivKey);
        READWRITE(nTimeCreated);
        READWRITE(nTimeExpires);
        READWRITE(strComment);
    )
};






/** Account information.
 * Stored in wallet with key "acc"+string account name.
 */
class CAccount
{
public:
    std::vector<unsigned char> vchPubKey;

    CAccount()
    {
        SetNull();
    }

    void SetNull()
    {
        vchPubKey.clear();
    }

    IMPLEMENT_SERIALIZE
    (
        if (!(nType & SER_GETHASH))
            READWRITE(nVersion);
        READWRITE(vchPubKey);
    )
};



/** Internal transfers.
 * Database key is acentry<account><counter>.
 */
class CAccountingEntry
{
public:
    std::string strAccount;
    int64 nCreditDebit;
    int64 nTime;
    std::string strOtherAccount;
    std::string strComment;

    CAccountingEntry()
    {
        SetNull();
    }

    void SetNull()
    {
        nCreditDebit = 0;
        nTime = 0;
        strAccount.clear();
        strOtherAccount.clear();
        strComment.clear();
    }

    IMPLEMENT_SERIALIZE
    (
        if (!(nType & SER_GETHASH))
            READWRITE(nVersion);
        // Note: strAccount is serialized as part of the key, not here.
        READWRITE(nCreditDebit);
        READWRITE(nTime);
        READWRITE(strOtherAccount);
        READWRITE(strComment);
    )
};

bool GetWalletFile(CWallet* pwallet, std::string &strWalletFileOut);

#endif