Support for error messages and a few more rejection reasons

src/main.cpp

@@ -1848,7 +1848,7 @@ bool SetBestChain(CValidationState &state, CBlockIndex* pindexNew)
         // an overestimation, as most will delete an existing entry or
         // overwrite one. Still, use a conservative safety factor of 2.
         if (!CheckDiskSpace(100 * 2 * 2 * pcoinsTip->GetCacheSize()))
-            return state.Error();
+            return state.Error("out of disk space");
         FlushBlockFile();
         pblocktree->Sync();
         if (!pcoinsTip->Flush())
@@ -1924,7 +1924,7 @@ bool AddToBlockIndex(CBlock& block, CValidationState& state, const CDiskBlockPos
     // Check for duplicate
     uint256 hash = block.GetHash();
     if (mapBlockIndex.count(hash))
-        return state.Invalid(error("AddToBlockIndex() : %s already exists", hash.ToString()));
+        return state.Invalid(error("AddToBlockIndex() : %s already exists", hash.ToString()), 0, "duplicate");
 
     // Construct new block index object
     CBlockIndex* pindexNew = new CBlockIndex(block);
@@ -2014,7 +2014,7 @@ bool FindBlockPos(CValidationState &state, CDiskBlockPos &pos, unsigned int nAdd
                 }
             }
             else
-                return state.Error();
+                return state.Error("out of disk space");
         }
     }
 
@@ -2060,7 +2060,7 @@ bool FindUndoPos(CValidationState &state, int nFile, CDiskBlockPos &pos, unsigne
             }
         }
         else
-            return state.Error();
+            return state.Error("out of disk space");
     }
 
     return true;
@@ -2138,7 +2138,7 @@ bool AcceptBlock(CBlock& block, CValidationState& state, CDiskBlockPos* dbp)
     // Check for duplicate
     uint256 hash = block.GetHash();
     if (mapBlockIndex.count(hash))
-        return state.Invalid(error("AcceptBlock() : block already in mapBlockIndex"));
+        return state.Invalid(error("AcceptBlock() : block already in mapBlockIndex"), 0, "duplicate");
 
     // Get prev block index
     CBlockIndex* pindexPrev = NULL;
@@ -2146,7 +2146,7 @@ bool AcceptBlock(CBlock& block, CValidationState& state, CDiskBlockPos* dbp)
     if (hash != Params().HashGenesisBlock()) {
         map<uint256, CBlockIndex*>::iterator mi = mapBlockIndex.find(block.hashPrevBlock);
         if (mi == mapBlockIndex.end())
-            return state.DoS(10, error("AcceptBlock() : prev block not found"));
+            return state.DoS(10, error("AcceptBlock() : prev block not found"), 0, "bad-prevblk");
         pindexPrev = (*mi).second;
         nHeight = pindexPrev->nHeight+1;
 
@@ -2269,9 +2269,9 @@ bool ProcessBlock(CValidationState &state, CNode* pfrom, CBlock* pblock, CDiskBl
     // Check for duplicate
     uint256 hash = pblock->GetHash();
     if (mapBlockIndex.count(hash))
-        return state.Invalid(error("ProcessBlock() : already have block %d %s", mapBlockIndex[hash]->nHeight, hash.ToString()));
+        return state.Invalid(error("ProcessBlock() : already have block %d %s", mapBlockIndex[hash]->nHeight, hash.ToString()), 0, "duplicate");
     if (mapOrphanBlocks.count(hash))
-        return state.Invalid(error("ProcessBlock() : already have block (orphan) %s", hash.ToString()));
+        return state.Invalid(error("ProcessBlock() : already have block (orphan) %s", hash.ToString()), 0, "duplicate");
 
     // Preliminary checks
     if (!CheckBlock(*pblock, state))

src/main.h

@@ -950,13 +950,15 @@ public:
                  unsigned char _chRejectCode=0, std::string _strRejectReason="") {
         return DoS(0, ret, _chRejectCode, _strRejectReason);
     }
-    bool Error() {
+    bool Error(std::string strRejectReasonIn="") {
+        if (mode == MODE_VALID)
+            strRejectReason = strRejectReasonIn;
         mode = MODE_ERROR;
         return false;
     }
     bool Abort(const std::string &msg) {
         AbortNode(msg);
-        return Error();
+        return Error(msg);
     }
     bool IsValid() {
         return mode == MODE_VALID;