1 files changed, 28 insertions, 2 deletions
diff --git a/src/net_processing.cpp b/src/net_processing.cpp
index 96c330db03..f5073fe903 100644
--- a/src/net_processing.cpp
+++ b/src/net_processing.cpp
@@ -403,6 +403,12 @@ void UpdateBlockAvailability(NodeId nodeid, const uint256 &hash) {
     }
 }
 
+/**
+ * When a peer sends us a valid block, instruct it to announce blocks to us
+ * using CMPCTBLOCK if possible by adding its nodeid to the end of
+ * lNodesAnnouncingHeaderAndIDs, and keeping that list under a certain size by
+ * removing the first element if necessary.
+ */
 void MaybeSetPeerAsAnnouncingHeaderAndIDs(NodeId nodeid, CConnman* connman) {
     AssertLockHeld(cs_main);
     CNodeState* nodestate = State(nodeid);
@@ -751,7 +757,11 @@ unsigned int LimitOrphanTxSize(unsigned int nMaxOrphans)
     return nEvicted;
 }
 
-// Requires cs_main.
+/**
+ * Mark a misbehaving peer to be banned depending upon the value of `-banscore`.
+ *
+ * Requires cs_main.
+ */
 void Misbehaving(NodeId pnode, int howmuch, const std::string& message)
 {
     if (howmuch == 0)
@@ -810,6 +820,10 @@ PeerLogicValidation::PeerLogicValidation(CConnman* connmanIn, CScheduler &schedu
     scheduler.scheduleEvery(std::bind(&PeerLogicValidation::CheckForStaleTipAndEvictPeers, this, consensusParams), EXTRA_PEER_CHECK_INTERVAL * 1000);
 }
 
+/**
+ * Evict orphan txn pool entries (EraseOrphanTx) based on a newly connected
+ * block. Also save the time of the last tip update.
+ */
 void PeerLogicValidation::BlockConnected(const std::shared_ptr<const CBlock>& pblock, const CBlockIndex* pindex, const std::vector<CTransactionRef>& vtxConflicted) {
     LOCK(g_cs_orphans);
 
@@ -830,7 +844,7 @@ void PeerLogicValidation::BlockConnected(const std::shared_ptr<const CBlock>& pb
         }
     }
 
-    // Erase orphan transactions include or precluded by this block
+    // Erase orphan transactions included or precluded by this block
     if (vOrphanErase.size()) {
         int nErased = 0;
         for (uint256 &orphanHash : vOrphanErase) {
@@ -849,6 +863,10 @@ static std::shared_ptr<const CBlockHeaderAndShortTxIDs> most_recent_compact_bloc
 static uint256 most_recent_block_hash;
 static bool fWitnessesPresentInMostRecentCompactBlock;
 
+/**
+ * Maintain state about the best-seen block and fast-announce a compact block 
+ * to compatible peers.
+ */
 void PeerLogicValidation::NewPoWValidBlock(const CBlockIndex *pindex, const std::shared_ptr<const CBlock>& pblock) {
     std::shared_ptr<const CBlockHeaderAndShortTxIDs> pcmpctblock = std::make_shared<const CBlockHeaderAndShortTxIDs> (*pblock, true);
     const CNetMsgMaker msgMaker(PROTOCOL_VERSION);
@@ -890,6 +908,10 @@ void PeerLogicValidation::NewPoWValidBlock(const CBlockIndex *pindex, const std:
     });
 }
 
+/**
+ * Update our best height and announce any block hashes which weren't previously 
+ * in chainActive to our peers.
+ */
 void PeerLogicValidation::UpdatedBlockTip(const CBlockIndex *pindexNew, const CBlockIndex *pindexFork, bool fInitialDownload) {
     const int nNewHeight = pindexNew->nHeight;
     connman->SetBestHeight(nNewHeight);
@@ -922,6 +944,10 @@ void PeerLogicValidation::UpdatedBlockTip(const CBlockIndex *pindexNew, const CB
     nTimeBestReceived = GetTime();
 }
 
+/**
+ * Handle invalid block rejection and consequent peer banning, maintain which 
+ * peers announce compact blocks.
+ */
 void PeerLogicValidation::BlockChecked(const CBlock& block, const CValidationState& state) {
     LOCK(cs_main);