Choose reasonable "smart" times to display for transactions

Logic:
- If sending a transaction, assign its timestamp to the current time.
- If receiving a transaction outside a block, assign its timestamp to the current time.
- If receiving a block with a future timestamp, assign all its (not already known) transactions' timestamps to the current time.
- If receiving a block with a past timestamp, before the most recent known transaction (that we care about), assign all its (not already known) transactions' timestamps to the same timestamp as that most-recent-known transaction.
- If receiving a block with a past timestamp, but after the most recent known transaction, assign all its (not already known) transactions' timestamps to the block time.

src/rpcwallet.cpp

@@ -986,29 +986,11 @@ Value listtransactions(const Array& params, bool fHelp)
         throw JSONRPCError(-8, "Negative from");
 
     Array ret;
-    CWalletDB walletdb(pwalletMain->strWalletFile);
-
-    // First: get all CWalletTx and CAccountingEntry into a sorted-by-order multimap.
-    typedef pair<CWalletTx*, CAccountingEntry*> TxPair;
-    typedef multimap<int64, TxPair > TxItems;
-    TxItems txOrdered;
 
-    // Note: maintaining indices in the database of (account,time) --> txid and (account, time) --> acentry
+    CWallet::TxItems txOrdered = pwalletMain->OrderedTxItems(strAccount);
-    // would make this much faster for applications that do this a lot.
-    for (map<uint256, CWalletTx>::iterator it = pwalletMain->mapWallet.begin(); it != pwalletMain->mapWallet.end(); ++it)
-    {
-        CWalletTx* wtx = &((*it).second);
-        txOrdered.insert(make_pair(wtx->nOrderPos, TxPair(wtx, (CAccountingEntry*)0)));
-    }
-    list<CAccountingEntry> acentries;
-    walletdb.ListAccountCreditDebit(strAccount, acentries);
-    BOOST_FOREACH(CAccountingEntry& entry, acentries)
-    {
-        txOrdered.insert(make_pair(entry.nOrderPos, TxPair((CWalletTx*)0, &entry)));
-    }
 
     // iterate backwards until we have nCount items to return:
-    for (TxItems::reverse_iterator it = txOrdered.rbegin(); it != txOrdered.rend(); ++it)
+    for (CWallet::TxItems::reverse_iterator it = txOrdered.rbegin(); it != txOrdered.rend(); ++it)
     {
         CWalletTx *const pwtx = (*it).second.first;
         if (pwtx != 0)

src/wallet.cpp

@@ -291,6 +291,31 @@ bool CWallet::EncryptWallet(const SecureString& strWalletPassphrase)
     return true;
 }
 
+CWallet::TxItems
+CWallet::OrderedTxItems(std::string strAccount)
+{
+    CWalletDB walletdb(strWalletFile);
+
+    // First: get all CWalletTx and CAccountingEntry into a sorted-by-order multimap.
+    TxItems txOrdered;
+
+    // Note: maintaining indices in the database of (account,time) --> txid and (account, time) --> acentry
+    // would make this much faster for applications that do this a lot.
+    for (map<uint256, CWalletTx>::iterator it = mapWallet.begin(); it != mapWallet.end(); ++it)
+    {
+        CWalletTx* wtx = &((*it).second);
+        txOrdered.insert(make_pair(wtx->nOrderPos, TxPair(wtx, (CAccountingEntry*)0)));
+    }
+    list<CAccountingEntry> acentries;
+    walletdb.ListAccountCreditDebit(strAccount, acentries);
+    BOOST_FOREACH(CAccountingEntry& entry, acentries)
+    {
+        txOrdered.insert(make_pair(entry.nOrderPos, TxPair((CWalletTx*)0, &entry)));
+    }
+
+    return txOrdered;
+}
+
 void CWallet::WalletUpdateSpent(const CTransaction &tx)
 {
     // Anytime a signature is successfully verified, it's proof the outpoint is spent.
@@ -339,6 +364,51 @@ bool CWallet::AddToWallet(const CWalletTx& wtxIn)
         {
             wtx.nTimeReceived = GetAdjustedTime();
             wtx.nOrderPos = nOrderPosNext++;
+
+            wtx.nTimeSmart = wtx.nTimeReceived;
+            if (wtxIn.hashBlock != 0)
+            {
+                if (mapBlockIndex.count(wtxIn.hashBlock))
+                {
+                    unsigned int latestNow = wtx.nTimeReceived;
+                    unsigned int latestEntry = 0;
+                    {
+                        // Tolerate times up to the last timestamp in the wallet not more than 5 minutes into the future
+                        int64 latestTolerated = latestNow + 300;
+                        TxItems txOrdered = OrderedTxItems();
+                        for (TxItems::reverse_iterator it = txOrdered.rbegin(); it != txOrdered.rend(); ++it)
+                        {
+                            CWalletTx *const pwtx = (*it).second.first;
+                            if (pwtx == &wtx)
+                                continue;
+                            CAccountingEntry *const pacentry = (*it).second.second;
+                            int64 nSmartTime;
+                            if (pwtx)
+                            {
+                                nSmartTime = pwtx->nTimeSmart;
+                                if (!nSmartTime)
+                                    nSmartTime = pwtx->nTimeReceived;
+                            }
+                            else
+                                nSmartTime = pacentry->nTime;
+                            if (nSmartTime <= latestTolerated)
+                            {
+                                latestEntry = nSmartTime;
+                                if (nSmartTime > latestNow)
+                                    latestNow = nSmartTime;
+                                break;
+                            }
+                        }
+                    }
+
+                    unsigned int& blocktime = mapBlockIndex[wtxIn.hashBlock]->nTime;
+                    wtx.nTimeSmart = std::max(latestEntry, std::min(blocktime, latestNow));
+                }
+                else
+                    printf("AddToWallet() : found %s in block %s not in index\n",
+                           wtxIn.GetHash().ToString().substr(0,10).c_str(),
+                           wtxIn.hashBlock.ToString().c_str());
+            }
         }
 
         bool fUpdated = false;
@@ -488,7 +558,8 @@ bool CWallet::IsChange(const CTxOut& txout) const
 
 int64 CWalletTx::GetTxTime() const
 {
-    return nTimeReceived;
+    int64 n = nTimeSmart;
+    return n ? n : nTimeReceived;
 }
 
 int CWalletTx::GetRequestCount() const

src/wallet.h

@@ -17,6 +17,7 @@
 #include "ui_interface.h"
 #include "util.h"
 
+class CAccountingEntry;
 class CWalletTx;
 class CReserveKey;
 class CWalletDB;
@@ -143,6 +144,10 @@ public:
     bool ChangeWalletPassphrase(const SecureString& strOldWalletPassphrase, const SecureString& strNewWalletPassphrase);
     bool EncryptWallet(const SecureString& strWalletPassphrase);
 
+    typedef std::pair<CWalletTx*, CAccountingEntry*> TxPair;
+    typedef std::multimap<int64, TxPair > TxItems;
+    TxItems OrderedTxItems(std::string strAccount = "");
+
     void MarkDirty();
     bool AddToWallet(const CWalletTx& wtxIn);
     bool AddToWalletIfInvolvingMe(const CTransaction& tx, const CBlock* pblock, bool fUpdate = false, bool fFindBlock = false);
@@ -351,6 +356,7 @@ public:
     std::vector<std::pair<std::string, std::string> > vOrderForm;
     unsigned int fTimeReceivedIsTxTime;
     unsigned int nTimeReceived;  // time received by this node
+    unsigned int nTimeSmart;
     char fFromMe;
     std::string strFromAccount;
     std::vector<char> vfSpent; // which outputs are already spent
@@ -394,6 +400,7 @@ public:
         vOrderForm.clear();
         fTimeReceivedIsTxTime = false;
         nTimeReceived = 0;
+        nTimeSmart = 0;
         fFromMe = false;
         strFromAccount.clear();
         vfSpent.clear();
@@ -429,6 +436,9 @@ public:
             pthis->mapValue["spent"] = str;
 
             WriteOrderPos(pthis->nOrderPos, pthis->mapValue);
+
+            if (nTimeSmart)
+                pthis->mapValue["timesmart"] = strprintf("%u", nTimeSmart);
         }
 
         nSerSize += SerReadWrite(s, *(CMerkleTx*)this, nType, nVersion,ser_action);
@@ -449,15 +459,17 @@ public:
                     pthis->vfSpent.push_back(c != '0');
             else
                 pthis->vfSpent.assign(vout.size(), fSpent);
-        }
 
-        if (fRead)
             ReadOrderPos(pthis->nOrderPos, pthis->mapValue);
 
+            pthis->nTimeSmart = mapValue.count("timesmart") ? (unsigned int)atoi64(pthis->mapValue["timesmart"]) : 0;
+        }
+
         pthis->mapValue.erase("fromaccount");
         pthis->mapValue.erase("version");
         pthis->mapValue.erase("spent");
         pthis->mapValue.erase("n");
+        pthis->mapValue.erase("timesmart");
     )
 
     // marks certain txout's as spent