Method BlockChecked

src/net_processing.cpp:1651–1680

* Handle invalid block rejection and consequent peer discouragement, maintain which * peers announce compact blocks. */

 * peers announce compact blocks.
 */
void PeerManagerImpl::BlockChecked(const CBlock& block, const BlockValidationState& state)
{
    LOCK(cs_main);

    const uint256 hash(block.GetHash());
    std::map<uint256, std::pair<NodeId, bool>>::iterator it = mapBlockSource.find(hash);

    // If the block failed validation, we know where it came from and we're still connected
    // to that peer, maybe punish.
    if (state.IsInvalid() &&
        it != mapBlockSource.end() &&
        State(it->second.first)) {
            MaybePunishNodeForBlock(/*nodeid=*/ it->second.first, state, /*via_compact_block=*/ !it->second.second);
    }
    // Check that:
    // 1. The block is valid
    // 2. We're not in initial block download
    // 3. This is currently the best block we're aware of. We haven't updated
    //    the tip yet so we have no way to check this directly here. Instead we
    //    just check that there are currently no other blocks in flight.
    else if (state.IsValid() &&
             !m_chainman.ActiveChainstate().IsInitialBlockDownload() &&
             mapBlocksInFlight.count(hash) == mapBlocksInFlight.size()) {
        if (it != mapBlockSource.end()) {
            MaybeSetPeerAsAnnouncingHeaderAndIDs(it->second.first);
        }
    }
    if (it != mapBlockSource.end())
        mapBlockSource.erase(it);
}

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