Add information to errors in ConnectBlock, CheckBlock

Add detailed state information to the errors, as it is no longer being
logged downstream.

Also add the state information to mempool rejection debug message in
ProcessMessages.

src/main.cpp

@@ -1777,7 +1777,8 @@ bool ConnectBlock(const CBlock& block, CValidationState& state, CBlockIndex* pin
 
             std::vector<CScriptCheck> vChecks;
             if (!CheckInputs(tx, state, view, fScriptChecks, flags, false, nScriptCheckThreads ? &vChecks : NULL))
-                return false;
+                return error("ConnectBlock(): CheckInputs on %s failed with %s",
+                    tx.GetHash().ToString(), FormatStateMessage(state));
             control.Add(vChecks);
         }
 
@@ -2604,7 +2605,9 @@ bool CheckBlock(const CBlock& block, CValidationState& state, bool fCheckPOW, bo
     // Check transactions
     BOOST_FOREACH(const CTransaction& tx, block.vtx)
         if (!CheckTransaction(tx, state))
-            return error("CheckBlock(): CheckTransaction failed");
+            return error("CheckBlock(): CheckTransaction of %s failed with %s",
+                tx.GetHash().ToString(),
+                FormatStateMessage(state));
 
     unsigned int nSigOps = 0;
     BOOST_FOREACH(const CTransaction& tx, block.vtx)
@@ -4341,7 +4344,7 @@ bool static ProcessMessage(CNode* pfrom, string strCommand, CDataStream& vRecv,
         {
             LogPrint("mempool", "%s from peer=%d %s was not accepted into the memory pool: %s\n", tx.GetHash().ToString(),
                 pfrom->id, pfrom->cleanSubVer,
-                state.GetRejectReason());
+                FormatStateMessage(state));
             if (state.GetRejectCode() < REJECT_INTERNAL) // Never send AcceptToMemoryPool's internal codes over P2P
                 pfrom->PushMessage("reject", strCommand, state.GetRejectCode(),
                                    state.GetRejectReason().substr(0, MAX_REJECT_MESSAGE_LENGTH), inv.hash);