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protocol: request txpool contents when synced

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A newly synced Alice sends a (typically quite small) list of
txids in the local tpxool to a random peer Bob, who then uses
the existing tx relay system to send Alice any tx in his txpool
which is not in the list Alice sent
This commit is contained in:
moneromooo-monero 2019-11-27 00:09:25 +00:00
parent d1cf16364f
commit 054b4c7f41
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GPG key ID: 686F07454D6CEFC3
9 changed files with 147 additions and 0 deletions
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68
src/cryptonote_protocol/cryptonote_protocol_handler.inl
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@ -83,6 +83,7 @@ namespace cryptonote
m_p2p(p_net_layout),
m_syncronized_connections_count(0),
m_synchronized(offline),
m_ask_for_txpool_complement(true),
m_stopping(false),
m_no_sync(false)
@ -885,6 +886,34 @@ namespace cryptonote
}
//------------------------------------------------------------------------------------------------------------------------
template<class t_core>
int t_cryptonote_protocol_handler<t_core>::handle_notify_get_txpool_complement(int command, NOTIFY_GET_TXPOOL_COMPLEMENT::request& arg, cryptonote_connection_context& context)
{
MLOG_P2P_MESSAGE("Received NOTIFY_GET_TXPOOL_COMPLEMENT (" << arg.hashes.size() << " txes)");
std::vector<std::pair<cryptonote::blobdata, block>> local_blocks;
std::vector<cryptonote::blobdata> local_txs;
std::vector<cryptonote::blobdata> txes;
if (!m_core.get_txpool_complement(arg.hashes, txes))
{
LOG_ERROR_CCONTEXT("failed to get txpool complement");
return 1;
}
NOTIFY_NEW_TRANSACTIONS::request new_txes;
new_txes.txs = std::move(txes);
MLOG_P2P_MESSAGE
(
"-->>NOTIFY_NEW_TRANSACTIONS: "
<< ", txs.size()=" << new_txes.txs.size()
);
post_notify<NOTIFY_NEW_TRANSACTIONS>(new_txes, context);
return 1;
}
//------------------------------------------------------------------------------------------------------------------------
template<class t_core>
int t_cryptonote_protocol_handler<t_core>::handle_notify_new_transactions(int command, NOTIFY_NEW_TRANSACTIONS::request& arg, cryptonote_connection_context& context)
{
MLOG_P2P_MESSAGE("Received NOTIFY_NEW_TRANSACTIONS (" << arg.txs.size() << " txes)");
@ -2201,6 +2230,27 @@ skip:
}
m_core.safesyncmode(true);
m_p2p->clear_used_stripe_peers();
// ask for txpool complement from any suitable node if we did not yet
val_expected = true;
if (m_ask_for_txpool_complement.compare_exchange_strong(val_expected, false))
{
m_p2p->for_each_connection([&](cryptonote_connection_context& context, nodetool::peerid_type peer_id, uint32_t support_flags)->bool
{
if(context.m_state < cryptonote_connection_context::state_synchronizing)
{
MDEBUG(context << "not ready, ignoring");
return true;
}
if (!request_txpool_complement(context))
{
MERROR(context << "Failed to request txpool complement");
return true;
}
return false;
});
}
return true;
}
//------------------------------------------------------------------------------------------------------------------------
@ -2354,6 +2404,21 @@ skip:
}
//------------------------------------------------------------------------------------------------------------------------
template<class t_core>
bool t_cryptonote_protocol_handler<t_core>::request_txpool_complement(cryptonote_connection_context &context)
{
NOTIFY_GET_TXPOOL_COMPLEMENT::request r = {};
if (!m_core.get_pool_transaction_hashes(r.hashes, false))
{
MERROR("Failed to get txpool hashes");
return false;
}
MLOG_P2P_MESSAGE("-->>NOTIFY_GET_TXPOOL_COMPLEMENT: hashes.size()=" << r.hashes.size() );
post_notify<NOTIFY_GET_TXPOOL_COMPLEMENT>(r, context);
MLOG_PEER_STATE("requesting txpool complement");
return true;
}
//------------------------------------------------------------------------------------------------------------------------
template<class t_core>
std::string t_cryptonote_protocol_handler<t_core>::get_peers_overview() const
{
std::stringstream ss;
@ -2463,7 +2528,10 @@ skip:
MINFO("Target height decreasing from " << previous_target << " to " << target);
m_core.set_target_blockchain_height(target);
if (target == 0 && context.m_state > cryptonote_connection_context::state_before_handshake && !m_stopping)
{
MCWARNING("global", "monerod is now disconnected from the network");
m_ask_for_txpool_complement = true;
}
}
m_block_queue.flush_spans(context.m_connection_id, false);