worker: log the chain a pool job builds on, not just its id

1 files changed, 23 insertions, 2 deletions

diff --git a/src/main.cpp b/src/main.cpp
index 7b3e555..3de3db0 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -4040,8 +4040,29 @@ connected:
                                         jobShared.jobSeq++;
                                         jobShared.haveJob = true;
                                     }
-                                    LogPrint("worker", "[pool->worker] new job %s received\n",
-                                             jobId.c_str());
+                                    // Log the chain position the pool is
+                                    // building on, so a stale or private
+                                    // fork is auditable from worker logs.
+                                    // The prevhash comes from the header we
+                                    // actually hash (== p[2] of the notify);
+                                    // a brief cs_main lookup is safe here --
+                                    // this thread holds no other lock.
+                                    uint256 hashPrev;
+                                    memcpy(&hashPrev, header + 4, 32);
+                                    int nPrevHeight = -1;
+                                    CRITICAL_BLOCK(cs_main)
+                                    {
+                                        map<uint256, CBlockIndex*>::iterator mi = mapBlockIndex.find(hashPrev);
+                                        if (mi != mapBlockIndex.end())
+                                            nPrevHeight = (*mi).second->nHeight;
+                                    }
+                                    if (nPrevHeight >= 0)
+                                        LogPrint("worker", "[pool->worker] new job %s received, prevhash %s (known, job height %d)\n",
+                                                 jobId.c_str(), hashPrev.GetHex().c_str(),
+                                                 nPrevHeight + 1);
+                                    else
+                                        LogPrint("worker", "[pool->worker] new job %s received, prevhash %s (unknown to our chain)\n",
+                                                 jobId.c_str(), hashPrev.GetHex().c_str());
                                     SetParticipantMiningStatus("hashing job " + jobId);
                                 }
                             }