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Defer inserting into maprelay until just before relaying.

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This reduces the rate of not founds by better matching the far
 end expectations, it also improves privacy by removing the
 ability to use getdata to probe for a node having a txn before
 it has been relayed.
This commit is contained in:
Gregory Maxwell
2016-05-21 09:45:32 +00:00
parent 862fd24b40
commit 4d8993b346
3 changed files with 30 additions and 31 deletions
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15
src/net.cpp
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@@ -90,9 +90,6 @@ std::string strSubVersion;
std::vector<CNode*> vNodes;
CCriticalSection cs_vNodes;
std::map<uint256, CTransaction> mapRelay;
std::deque<std::pair<int64_t, uint256> > vRelayExpiration;
CCriticalSection cs_mapRelay;
limitedmap<uint256, int64_t> mapAlreadyAskedFor(MAX_INV_SZ);
static std::deque<std::string> vOneShots;
@@ -2081,18 +2078,6 @@ instance_of_cnetcleanup;
void RelayTransaction(const CTransaction& tx)
{
CInv inv(MSG_TX, tx.GetHash());
{
LOCK(cs_mapRelay);
// Expire old relay messages
while (!vRelayExpiration.empty() && vRelayExpiration.front().first < GetTime())
{
mapRelay.erase(vRelayExpiration.front().second);
vRelayExpiration.pop_front();
}
mapRelay.insert(std::make_pair(inv.hash, tx));
vRelayExpiration.push_back(std::make_pair(GetTime() + 15 * 60, inv.hash));
}
LOCK(cs_vNodes);
BOOST_FOREACH(CNode* pnode, vNodes)
{