Remove pfrom parameter from ProcessNewBlock

This further decouples ProcessNewBlock from networking/peer logic.

Author: TheBlueMatt

src/main.cpp

@@ -3787,19 +3787,15 @@ static bool AcceptBlock(const CBlock& block, CValidationState& state, const CCha
     return true;
 }
 
-bool ProcessNewBlock(CValidationState& state, const CChainParams& chainparams, CNode* pfrom, const CBlock* pblock, bool fForceProcessing, const CDiskBlockPos* dbp, bool fMayBanPeerIfInvalid)
+bool ProcessNewBlock(CValidationState& state, const CChainParams& chainparams, const CBlock* pblock, bool fForceProcessing, const CDiskBlockPos* dbp, bool *fNewBlock)
 {
     {
         LOCK(cs_main);
 
         // Store to disk
         CBlockIndex *pindex = NULL;
-        bool fNewBlock = false;
-        bool ret = AcceptBlock(*pblock, state, chainparams, &pindex, fForceProcessing, dbp, &fNewBlock);
-        if (pindex && pfrom) {
-            mapBlockSource[pindex->GetBlockHash()] = std::make_pair(pfrom->GetId(), fMayBanPeerIfInvalid);
-            if (fNewBlock) pfrom->nLastBlockTime = GetTime();
-        }
+        if (fNewBlock) *fNewBlock = false;
+        bool ret = AcceptBlock(*pblock, state, chainparams, &pindex, fForceProcessing, dbp, fNewBlock);
         CheckBlockIndex(chainparams.GetConsensus());
         if (!ret)
             return error("%s: AcceptBlock FAILED", __func__);
@@ -5914,22 +5910,29 @@ bool static ProcessMessage(CNode* pfrom, string strCommand, CDataStream& vRecv,
                 // updated, reject messages go out, etc.
                 MarkBlockAsReceived(resp.blockhash); // it is now an empty pointer
                 fBlockRead = true;
+                // mapBlockSource is only used for sending reject messages and DoS scores,
+                // so the race between here and cs_main in ProcessNewBlock is fine.
+                mapBlockSource.emplace(resp.blockhash, std::make_pair(pfrom->GetId(), false));
             }
         } // Don't hold cs_main when we call into ProcessNewBlock
         if (fBlockRead) {
             CValidationState state;
+            bool fNewBlock = false;
             // Since we requested this block (it was in mapBlocksInFlight), force it to be processed,
             // even if it would not be a candidate for new tip (missing previous block, chain not long enough, etc)
             // BIP 152 permits peers to relay compact blocks after validating
             // the header only; we should not punish peers if the block turns
             // out to be invalid.
-            ProcessNewBlock(state, chainparams, pfrom, &block, true, NULL, false);
+            ProcessNewBlock(state, chainparams, &block, true, NULL, &fNewBlock);
             int nDoS;
             if (state.IsInvalid(nDoS)) {
                 assert (state.GetRejectCode() < REJECT_INTERNAL); // Blocks are never rejected with internal reject codes
                 connman.PushMessage(pfrom, NetMsgType::REJECT, strCommand, (unsigned char)state.GetRejectCode(),
                                    state.GetRejectReason().substr(0, MAX_REJECT_MESSAGE_LENGTH), block.GetHash());
-            }
+                LOCK(cs_main);
+                mapBlockSource.erase(resp.blockhash);
+            } else if (fNewBlock)
+                pfrom->nLastBlockTime = GetTime();
         }
     }
 
@@ -6093,13 +6096,18 @@ bool static ProcessMessage(CNode* pfrom, string strCommand, CDataStream& vRecv,
         // Such an unrequested block may still be processed, subject to the
         // conditions in AcceptBlock().
         bool forceProcessing = pfrom->fWhitelisted && !IsInitialBlockDownload();
+        const uint256 hash(block.GetHash());
         {
             LOCK(cs_main);
             // Also always process if we requested the block explicitly, as we may
             // need it even though it is not a candidate for a new best tip.
-            forceProcessing |= MarkBlockAsReceived(block.GetHash());
+            forceProcessing |= MarkBlockAsReceived(hash);
+            // mapBlockSource is only used for sending reject messages and DoS scores,
+            // so the race between here and cs_main in ProcessNewBlock is fine.
+            mapBlockSource.emplace(hash, std::make_pair(pfrom->GetId(), true));
         }
-        ProcessNewBlock(state, chainparams, pfrom, &block, forceProcessing, NULL, true);
+        bool fNewBlock = false;
+        ProcessNewBlock(state, chainparams, &block, forceProcessing, NULL, &fNewBlock);
         int nDoS;
         if (state.IsInvalid(nDoS)) {
             assert (state.GetRejectCode() < REJECT_INTERNAL); // Blocks are never rejected with internal reject codes
@@ -6109,7 +6117,10 @@ bool static ProcessMessage(CNode* pfrom, string strCommand, CDataStream& vRecv,
                 LOCK(cs_main);
                 Misbehaving(pfrom->GetId(), nDoS);
             }
-        }
+            LOCK(cs_main);
+            mapBlockSource.erase(hash);
+        } else if (fNewBlock)
+            pfrom->nLastBlockTime = GetTime();
 
     }
 

src/main.h

@@ -217,13 +217,13 @@ static const uint64_t MIN_DISK_SPACE_FOR_BLOCK_FILES = 550 * 1024 * 1024;
  * specific block passed to it has been checked for validity!
  * 
  * @param[out]  state   This may be set to an Error state if any error occurred processing it, including during validation/connection/etc of otherwise unrelated blocks during reorganization; or it may be set to an Invalid state if pblock is itself invalid (but this is not guaranteed even when the block is checked). If you want to *possibly* get feedback on whether pblock is valid, you must also install a CValidationInterface (see validationinterface.h) - this will have its BlockChecked method called whenever *any* block completes validation.
- * @param[in]   pfrom   The node which we are receiving the block from; it is added to mapBlockSource and may be penalised if the block is invalid.
  * @param[in]   pblock  The block we want to process.
  * @param[in]   fForceProcessing Process this block even if unrequested; used for non-network block sources and whitelisted peers.
  * @param[out]  dbp     The already known disk position of pblock, or NULL if not yet stored.
+ * @param[out]  fNewBlock A boolean which is set to indicate if the block was first received via this call
  * @return True if state.IsValid()
  */
-bool ProcessNewBlock(CValidationState& state, const CChainParams& chainparams, CNode* pfrom, const CBlock* pblock, bool fForceProcessing, const CDiskBlockPos* dbp, bool fMayBanPeerIfInvalid);
+bool ProcessNewBlock(CValidationState& state, const CChainParams& chainparams, const CBlock* pblock, bool fForceProcessing, const CDiskBlockPos* dbp, bool* fNewBlock);
 /** Check whether enough disk space is available for an incoming block */
 bool CheckDiskSpace(uint64_t nAdditionalBytes = 0);
 /** Open a block file (blk?????.dat) */

src/rpc/mining.cpp

@@ -132,7 +132,7 @@ UniValue generateBlocks(boost::shared_ptr<CReserveScript> coinbaseScript, int nG
             continue;
         }
         CValidationState state;
-        if (!ProcessNewBlock(state, Params(), NULL, pblock, true, NULL, false))
+        if (!ProcessNewBlock(state, Params(), pblock, true, NULL, NULL))
             throw JSONRPCError(RPC_INTERNAL_ERROR, "ProcessNewBlock, block not accepted");
         ++nHeight;
         blockHashes.push_back(pblock->GetHash().GetHex());
@@ -757,7 +757,7 @@ UniValue submitblock(const JSONRPCRequest& request)
     CValidationState state;
     submitblock_StateCatcher sc(block.GetHash());
     RegisterValidationInterface(&sc);
-    bool fAccepted = ProcessNewBlock(state, Params(), NULL, &block, true, NULL, false);
+    bool fAccepted = ProcessNewBlock(state, Params(), &block, true, NULL, NULL);
     UnregisterValidationInterface(&sc);
     if (fBlockPresent)
     {

src/test/miner_tests.cpp

@@ -223,7 +223,7 @@ BOOST_AUTO_TEST_CASE(CreateNewBlock_validity)
         pblock->hashMerkleRoot = BlockMerkleRoot(*pblock);
         pblock->nNonce = blockinfo[i].nonce;
         CValidationState state;
-        BOOST_CHECK(ProcessNewBlock(state, chainparams, NULL, pblock, true, NULL, false));
+        BOOST_CHECK(ProcessNewBlock(state, chainparams, pblock, true, NULL, NULL));
         BOOST_CHECK(state.IsValid());
         pblock->hashPrevBlock = pblock->GetHash();
     }

src/test/test_bitcoin.cpp

@@ -127,7 +127,7 @@ TestChain100Setup::CreateAndProcessBlock(const std::vector<CMutableTransaction>&
     while (!CheckProofOfWork(block.GetHash(), block.nBits, chainparams.GetConsensus())) ++block.nNonce;
 
     CValidationState state;
-    ProcessNewBlock(state, chainparams, NULL, &block, true, NULL, false);
+    ProcessNewBlock(state, chainparams, &block, true, NULL, NULL);
 
     CBlock result = block;
     return result;