Fix progress reporting issue

Author: stevenroose

src/qt/clientmodel.cpp

@@ -130,7 +130,7 @@ double ClientModel::getVerificationProgress(const CBlockIndex *tipIn) const
         LOCK(cs_main);
         tip = chainActive.Tip();
     }
-    return GuessVerificationProgress(Params().TxData(), tip);
+    return GuessVerificationProgress(tip, Params().GetConsensus().nPowTargetSpacing);
 }
 
 void ClientModel::updateTimer()

src/rpc/blockchain.cpp

@@ -1074,7 +1074,7 @@ UniValue getblockchaininfo(const JSONRPCRequest& request)
     obj.push_back(Pair("headers",               pindexBestHeader ? pindexBestHeader->nHeight : -1));
     obj.push_back(Pair("bestblockhash",         tip->GetBlockHash().GetHex()));
     obj.push_back(Pair("mediantime",            (int64_t)tip->GetMedianTimePast()));
-    obj.push_back(Pair("verificationprogress",  GuessVerificationProgress(Params().TxData(), tip)));
+    obj.push_back(Pair("verificationprogress",  GuessVerificationProgress(tip, Params().GetConsensus().nPowTargetSpacing)));
     obj.push_back(Pair("pruned",                fPruneMode));
     obj.push_back(Pair("signblock_asm", ScriptToAsmStr(tip->proof.challenge)));
     obj.push_back(Pair("signblock_hex", HexStr(tip->proof.challenge.begin(), tip->proof.challenge.end())));

src/validation.cpp

@@ -3042,7 +3042,8 @@ void static UpdateTip(CBlockIndex *pindexNew, const CChainParams& chainParams) {
       chainActive.Tip()->GetBlockHash().ToString(), chainActive.Height(), chainActive.Tip()->nVersion,
       log(chainActive.Tip()->nChainWork.getdouble())/log(2.0), (unsigned long)chainActive.Tip()->nChainTx,
       DateTimeStrFormat("%Y-%m-%d %H:%M:%S", chainActive.Tip()->GetBlockTime()),
-      GuessVerificationProgress(chainParams.TxData(), chainActive.Tip()), pcoinsTip->DynamicMemoryUsage() * (1.0 / (1<<20)), pcoinsTip->GetCacheSize());
+      GuessVerificationProgress(chainActive.Tip(), chainParams.GetConsensus().nPowTargetSpacing),
+      pcoinsTip->DynamicMemoryUsage() * (1.0 / (1<<20)), pcoinsTip->GetCacheSize());
     if (!warningMessages.empty())
         LogPrintf(" warning='%s'", boost::algorithm::join(warningMessages, ", "));
     LogPrintf("\n");
@@ -4609,10 +4610,10 @@ bool static LoadBlockIndexDB(const CChainParams& chainparams)
 
     PruneBlockIndexCandidates();
 
-    LogPrintf("%s: hashBestChain=%s height=%d date=%s progress=%f\n", __func__,
+    LogPrintf("%s: hashBestChain=%s height=%d date=%s progress=%.3f\n", __func__,
         chainActive.Tip()->GetBlockHash().ToString(), chainActive.Height(),
         DateTimeStrFormat("%Y-%m-%d %H:%M:%S", chainActive.Tip()->GetBlockTime()),
-        GuessVerificationProgress(chainparams.TxData(), chainActive.Tip()));
+        GuessVerificationProgress(chainActive.Tip(), chainparams.GetConsensus().nPowTargetSpacing));
 
     return true;
 }
@@ -5317,22 +5318,20 @@ void DumpMempool(void)
     }
 }
 
-//! Guess how far we are in the verification process at the given block index
-double GuessVerificationProgress(const ChainTxData& data, CBlockIndex *pindex) {
-    if (pindex == NULL)
+// Guess how far we are in the verification process at the given block index.
+// Since we have signed fixed-interval blocks, estimating progress is a very easy.
+// We can extrapolate the last block time to the current time to estimate how many more blocks
+// we expect.
+double GuessVerificationProgress(CBlockIndex *pindex, int64_t blockInterval) {
+    if (pindex == NULL || pindex->nHeight < 2)
         return 0.0;
 
     int64_t nNow = time(NULL);
-
-    double fTxTotal;
-
-    if (pindex->nChainTx <= data.nTxCount) {
-        fTxTotal = data.nTxCount + (nNow - data.nTime) * data.dTxRate;
-    } else {
-        fTxTotal = pindex->nChainTx + (nNow - pindex->GetBlockTime()) * data.dTxRate;
-    }
-
-    return pindex->nChainTx / fTxTotal;
+    int64_t moreBlocksExpected = (nNow - pindex->GetBlockTime()) / blockInterval;
+    double progress = (pindex->nHeight + 0.0) / (pindex->nHeight + moreBlocksExpected);
+    // Round to 3 digits to avoid 0.999999 when finished.
+    progress = ceil(progress * 1000.0) / 1000.0;
+    return progress;
 }
 
 class CMainCleanup

src/validation.h

@@ -287,7 +287,7 @@ bool ActivateBestChain(CValidationState& state, const CChainParams& chainparams,
 CAmount GetBlockSubsidy(int nHeight, const Consensus::Params& consensusParams);
 
 /** Guess verification progress (as a fraction between 0.0=genesis and 1.0=current tip). */
-double GuessVerificationProgress(const ChainTxData& data, CBlockIndex* pindex);
+double GuessVerificationProgress(CBlockIndex* pindex, int64_t blockInterval);
 
 /**
  * Prune block and undo files (blk???.dat and undo???.dat) so that the disk space used is less than a user-defined target.

src/wallet/wallet.cpp

@@ -1692,12 +1692,14 @@ CBlockIndex* CWallet::ScanForWalletTransactions(CBlockIndex* pindexStart, bool f
             pindex = chainActive.Next(pindex);
 
         ShowProgress(_("Rescanning..."), 0); // show rescan progress in GUI as dialog or on splashscreen, if -rescan on startup
-        double dProgressStart = GuessVerificationProgress(chainParams.TxData(), pindex);
-        double dProgressTip = GuessVerificationProgress(chainParams.TxData(), chainActive.Tip());
+        double dProgressStart = GuessVerificationProgress(pindex, chainParams.GetConsensus().nPowTargetSpacing);
+        double dProgressTip = GuessVerificationProgress(chainActive.Tip(), chainParams.GetConsensus().nPowTargetSpacing);
         while (pindex)
         {
-            if (pindex->nHeight % 100 == 0 && dProgressTip - dProgressStart > 0.0)
-                ShowProgress(_("Rescanning..."), std::max(1, std::min(99, (int)((GuessVerificationProgress(chainParams.TxData(), pindex) - dProgressStart) / (dProgressTip - dProgressStart) * 100))));
+            if (pindex->nHeight % 100 == 0 && dProgressTip - dProgressStart > 0.0) {
+                double progress = GuessVerificationProgress(pindex, chainParams.GetConsensus().nPowTargetSpacing);
+                ShowProgress(_("Rescanning..."), std::max(1, std::min(99, (int)((progress - dProgressStart) / (dProgressTip - dProgressStart) * 100))));
+            }
 
             CBlock block;
             if (ReadBlockFromDisk(block, pindex, Params().GetConsensus())) {
@@ -1713,7 +1715,8 @@ CBlockIndex* CWallet::ScanForWalletTransactions(CBlockIndex* pindexStart, bool f
             pindex = chainActive.Next(pindex);
             if (GetTime() >= nNow + 60) {
                 nNow = GetTime();
-                LogPrintf("Still rescanning. At block %d. Progress=%f\n", pindex->nHeight, GuessVerificationProgress(chainParams.TxData(), pindex));
+                double progress = GuessVerificationProgress(pindex, chainParams.GetConsensus().nPowTargetSpacing);
+                LogPrintf("Still rescanning. At block %d. Progress=%f\n", pindex->nHeight, progress);
             }
         }
         ShowProgress(_("Rescanning..."), 100); // hide progress dialog in GUI