From bb8ea1f6304d7ed3f5fe0a01c060ac9f94629349 Mon Sep 17 00:00:00 2001
From: Matt Corallo <git@bluematt.me>
Date: Wed, 9 Sep 2015 16:31:20 -0700
Subject: removeForReorg calls once-per-disconnect-> once-per-reorg

---
 src/main.cpp | 22 ++++++++++++++--------
 src/main.h   |  2 +-
 2 files changed, 15 insertions(+), 9 deletions(-)

(limited to 'src')

diff --git a/src/main.cpp b/src/main.cpp
index e05237da20..8f67c03510 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -2310,12 +2310,11 @@ void static UpdateTip(CBlockIndex *pindexNew) {
     }
 }
 
-/** Disconnect chainActive's tip. You want to manually re-limit mempool size after this */
+/** Disconnect chainActive's tip. You probably want to call mempool.removeForReorg and manually re-limit mempool size after this, with cs_main held. */
 bool static DisconnectTip(CValidationState& state, const Consensus::Params& consensusParams)
 {
     CBlockIndex *pindexDelete = chainActive.Tip();
     assert(pindexDelete);
-    mempool.check(pcoinsTip);
     // Read block from disk.
     CBlock block;
     if (!ReadBlockFromDisk(block, pindexDelete, consensusParams))
@@ -2350,8 +2349,6 @@ bool static DisconnectTip(CValidationState& state, const Consensus::Params& cons
     // UpdateTransactionsFromBlock finds descendants of any transactions in this
     // block that were added back and cleans up the mempool state.
     mempool.UpdateTransactionsFromBlock(vHashUpdate);
-    mempool.removeForReorg(pcoinsTip, pindexDelete->nHeight);
-    mempool.check(pcoinsTip);
     // Update chainActive and related variables.
     UpdateTip(pindexDelete->pprev);
     // Let wallets know transactions went from 1-confirmed to
@@ -2375,7 +2372,6 @@ static int64_t nTimePostConnect = 0;
 bool static ConnectTip(CValidationState& state, const CChainParams& chainparams, CBlockIndex* pindexNew, const CBlock* pblock)
 {
     assert(pindexNew->pprev == chainActive.Tip());
-    mempool.check(pcoinsTip);
     // Read block from disk.
     int64_t nTime1 = GetTimeMicros();
     CBlock block;
@@ -2412,7 +2408,6 @@ bool static ConnectTip(CValidationState& state, const CChainParams& chainparams,
     // Remove conflicting transactions from the mempool.
     list<CTransaction> txConflicted;
     mempool.removeForBlock(pblock->vtx, pindexNew->nHeight, txConflicted, !IsInitialBlockDownload());
-    mempool.check(pcoinsTip);
     // Update chainActive & related variables.
     UpdateTip(pindexNew);
     // Tell wallet about transactions that went from mempool
@@ -2515,8 +2510,11 @@ static bool ActivateBestChainStep(CValidationState& state, const CChainParams& c
     // Disconnect active blocks which are no longer in the best chain.
     bool fBlocksDisconnected = false;
     while (chainActive.Tip() && chainActive.Tip() != pindexFork) {
-        if (!DisconnectTip(state, chainparams.GetConsensus()))
+        if (!DisconnectTip(state, chainparams.GetConsensus())) {
+            // Probably an AbortNode() error, but try to keep mempool consistent anyway
+            mempool.removeForReorg(pcoinsTip, chainActive.Tip()->nHeight + 1);
             return false;
+        }
         fBlocksDisconnected = true;
     }
 
@@ -2550,6 +2548,9 @@ static bool ActivateBestChainStep(CValidationState& state, const CChainParams& c
                     break;
                 } else {
                     // A system error occurred (disk space, database error, ...).
+                    // Probably gonna shut down ASAP, but try to keep mempool consistent anyway
+                    if (fBlocksDisconnected)
+                        mempool.removeForReorg(pcoinsTip, chainActive.Tip()->nHeight + 1);
                     return false;
                 }
             } else {
@@ -2563,8 +2564,11 @@ static bool ActivateBestChainStep(CValidationState& state, const CChainParams& c
         }
     }
 
-    if (fBlocksDisconnected)
+    if (fBlocksDisconnected) {
+        mempool.removeForReorg(pcoinsTip, chainActive.Tip()->nHeight + 1);
         mempool.TrimToSize(GetArg("-maxmempool", DEFAULT_MAX_MEMPOOL_SIZE) * 1000000);
+    }
+    mempool.check(pcoinsTip);
 
     // Callbacks/notifications for a new best chain.
     if (fInvalidFound)
@@ -2672,6 +2676,7 @@ bool InvalidateBlock(CValidationState& state, const Consensus::Params& consensus
         // ActivateBestChain considers blocks already in chainActive
         // unconditionally valid already, so force disconnect away from it.
         if (!DisconnectTip(state, consensusParams)) {
+            mempool.removeForReorg(pcoinsTip, chainActive.Tip()->nHeight + 1);
             return false;
         }
     }
@@ -2689,6 +2694,7 @@ bool InvalidateBlock(CValidationState& state, const Consensus::Params& consensus
     }
 
     InvalidChainFound(pindex);
+    mempool.removeForReorg(pcoinsTip, chainActive.Tip()->nHeight + 1);
     return true;
 }
 
diff --git a/src/main.h b/src/main.h
index bdbfa3826e..2996fdcb5a 100644
--- a/src/main.h
+++ b/src/main.h
@@ -467,7 +467,7 @@ bool InvalidateBlock(CValidationState& state, const Consensus::Params& consensus
 /** Remove invalidity status from a block and its descendants. */
 bool ReconsiderBlock(CValidationState& state, CBlockIndex *pindex);
 
-/** The currently-connected chain of blocks. */
+/** The currently-connected chain of blocks (protected by cs_main). */
 extern CChain chainActive;
 
 /** Global variable that points to the active CCoinsView (protected by cs_main) */
-- 
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