Improve getheaders (sending) logging

src/main.cpp

@@ -3610,6 +3610,7 @@ bool static ProcessMessage(CNode* pfrom, string strCommand, CDataStream& vRecv,
                         // later (within the same cs_main lock, though).
                         MarkBlockAsInFlight(pfrom->GetId(), inv.hash);
                     }
+                    LogPrint("net", "getheaders (%d) %s to peer=%d\n", pindexBestHeader->nHeight, inv.hash.ToString(), pfrom->id);
                 }
             }
 
@@ -3712,7 +3713,7 @@ bool static ProcessMessage(CNode* pfrom, string strCommand, CDataStream& vRecv,
         // we must use CBlocks, as CBlockHeaders won't include the 0x00 nTx count at the end
         vector<CBlock> vHeaders;
         int nLimit = MAX_HEADERS_RESULTS;
-        LogPrint("net", "getheaders %d to %s\n", (pindex ? pindex->nHeight : -1), hashStop.ToString());
+        LogPrint("net", "getheaders %d to %s from peer=%d\n", (pindex ? pindex->nHeight : -1), hashStop.ToString(), pfrom->id);
         for (; pindex; pindex = chainActive.Next(pindex))
         {
             vHeaders.push_back(pindex->GetBlockHeader());
@@ -3878,6 +3879,7 @@ bool static ProcessMessage(CNode* pfrom, string strCommand, CDataStream& vRecv,
             // Headers message had its maximum size; the peer may have more headers.
             // TODO: optimize: if pindexLast is an ancestor of chainActive.Tip or pindexBestHeader, continue
             // from there instead.
+            LogPrint("net", "more getheaders (%d) to end to peer=%d (startheight:%d)\n", pindexLast->nHeight, pfrom->id, pfrom->nStartingHeight);
             pfrom->PushMessage("getheaders", chainActive.GetLocator(pindexLast), uint256(0));
         }
     }
@@ -4381,6 +4383,7 @@ bool SendMessages(CNode* pto, bool fSendTrickle)
                 state.fSyncStarted = true;
                 nSyncStarted++;
                 CBlockIndex *pindexStart = pindexBestHeader->pprev ? pindexBestHeader->pprev : pindexBestHeader;
+                LogPrint("net", "initial getheaders (%d) to peer=%d (startheight:%d)\n", pindexStart->nHeight, pto->id, pto->nStartingHeight);
                 pto->PushMessage("getheaders", chainActive.GetLocator(pindexStart), uint256(0));
             }
         }