Sanity checks for estimates

Require at least 11 samples before giving fee/priority estimates.

And have wallet-created transactions go throught the fee-sanity-check
code path.

src/main.cpp

@@ -1129,10 +1129,10 @@ int CMerkleTx::GetBlocksToMaturity() const
 }
 
 
-bool CMerkleTx::AcceptToMemoryPool(bool fLimitFree)
+bool CMerkleTx::AcceptToMemoryPool(bool fLimitFree, bool fRejectInsaneFee)
 {
     CValidationState state;
-    return ::AcceptToMemoryPool(mempool, state, *this, fLimitFree, NULL);
+    return ::AcceptToMemoryPool(mempool, state, *this, fLimitFree, NULL, fRejectInsaneFee);
 }
 
 

src/main.h

@@ -452,7 +452,7 @@ public:
     int GetDepthInMainChain() const { CBlockIndex *pindexRet; return GetDepthInMainChain(pindexRet); }
     bool IsInMainChain() const { CBlockIndex *pindexRet; return GetDepthInMainChainINTERNAL(pindexRet) > 0; }
     int GetBlocksToMaturity() const;
-    bool AcceptToMemoryPool(bool fLimitFree=true);
+    bool AcceptToMemoryPool(bool fLimitFree=true, bool fRejectInsaneFee=true);
 };
 
 

src/txmempool.cpp

@@ -251,8 +251,13 @@ public:
             std::sort(sortedFeeSamples.begin(), sortedFeeSamples.end(),
                       std::greater<CFeeRate>());
         }
-        if (sortedFeeSamples.size() == 0)
+        if (sortedFeeSamples.size() < 11)
+        {
+            // Eleven is Gavin's Favorite Number
+            // ... but we also take a maximum of 10 samples per block so eleven means
+            // we're getting samples from at least two different blocks
             return CFeeRate(0);
+        }
 
         int nBucketSize = history.at(nBlocksToConfirm).FeeSamples();
 
@@ -281,7 +286,7 @@ public:
             std::sort(sortedPrioritySamples.begin(), sortedPrioritySamples.end(),
                       std::greater<double>());
         }
-        if (sortedPrioritySamples.size() == 0)
+        if (sortedPrioritySamples.size() < 11)
             return -1.0;
 
         int nBucketSize = history.at(nBlocksToConfirm).PrioritySamples();