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track double spending in the txpool

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Transactions in the txpool are marked when another transaction
is seen double spending one or more of its inputs.
This is then exposed wherever appropriate.

Note that being marked with this "double spend seen" flag does
NOT mean this transaction IS a double spend and will never be
mined: it just means that the network has seen at least another
transaction spending at least one of the same inputs, so care
should be taken to wait for a few confirmations before acting
upon that transaction (ie, mostly of use for merchants wanting
to accept unconfirmed transactions).
This commit is contained in:
moneromooo-monero
2017-09-22 13:57:20 +01:00
parent 3dd31d33fa
commit ccf53a566c
16 changed files with 216 additions and 62 deletions
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37
src/rpc/core_rpc_server.cpp
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@@ -478,15 +478,17 @@ namespace cryptonote
// try the pool for any missing txes
size_t found_in_pool = 0;
std::unordered_set<crypto::hash> pool_tx_hashes;
std::unordered_map<crypto::hash, bool> double_spend_seen;
if (!missed_txs.empty())
{
std::list<transaction> pool_txs;
bool r = m_core.get_pool_transactions(pool_txs);
std::vector<tx_info> pool_tx_info;
std::vector<spent_key_image_info> pool_key_image_info;
bool r = m_core.get_pool_transactions_and_spent_keys_info(pool_tx_info, pool_key_image_info);
if(r)
{
// sort to match original request
std::list<transaction> sorted_txs;
std::list<cryptonote::transaction>::const_iterator i;
std::vector<tx_info>::const_iterator i;
for (const crypto::hash &h: vh)
{
if (std::find(missed_txs.begin(), missed_txs.end(), h) == missed_txs.end())
@@ -500,11 +502,26 @@ namespace cryptonote
sorted_txs.push_back(std::move(txs.front()));
txs.pop_front();
}
else if ((i = std::find_if(pool_txs.begin(), pool_txs.end(), [h](cryptonote::transaction &tx) { return h == cryptonote::get_transaction_hash(tx); })) != pool_txs.end())
else if ((i = std::find_if(pool_tx_info.begin(), pool_tx_info.end(), [h](const tx_info &txi) { return epee::string_tools::pod_to_hex(h) == txi.id_hash; })) != pool_tx_info.end())
{
sorted_txs.push_back(*i);
cryptonote::transaction tx;
if (!cryptonote::parse_and_validate_tx_from_blob(i->tx_blob, tx))
{
res.status = "Failed to parse and validate tx from blob";
return true;
}
sorted_txs.push_back(tx);
missed_txs.remove(h);
pool_tx_hashes.insert(h);
const std::string hash_string = epee::string_tools::pod_to_hex(h);
for (const auto &ti: pool_tx_info)
{
if (ti.id_hash == hash_string)
{
double_spend_seen.insert(std::make_pair(h, ti.double_spend_seen));
break;
}
}
++found_in_pool;
}
}
@@ -530,11 +547,21 @@ namespace cryptonote
if (e.in_pool)
{
e.block_height = e.block_timestamp = std::numeric_limits<uint64_t>::max();
if (double_spend_seen.find(tx_hash) != double_spend_seen.end())
{
e.double_spend_seen = double_spend_seen[tx_hash];
}
else
{
MERROR("Failed to determine double spend status for " << tx_hash);
e.double_spend_seen = false;
}
}
else
{
e.block_height = m_core.get_blockchain_storage().get_db().get_tx_block_height(tx_hash);
e.block_timestamp = m_core.get_blockchain_storage().get_db().get_block_timestamp(e.block_height);
e.double_spend_seen = false;
}
// fill up old style responses too, in case an old wallet asks