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.

1 files changed, 72 insertions, 1 deletions

diff --git a/src/wallet.cpp b/src/wallet.cpp
index 3d380c827f..07a5047cef 100644
--- a/src/wallet.cpp
+++ b/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