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Generalize TX request code

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This commit is contained in:
Alexander Block 2020-04-06 13:25:38 +02:00
parent 8c11a8e698
commit 29d3b75f28
2 changed files with 54 additions and 35 deletions
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86
src/net_processing.cpp
View File

@ -315,18 +315,20 @@ struct CNodeState {
* that if somehow the transaction is not accepted but also not added to
* the reject filter, then we will eventually redownload from other
* peers.
*
* DASH: For Dash, this does not only handles TXs but also all Dash specific objects
*/
struct TxDownloadState {
/* Track when to attempt download of announced transactions (process
* time in micros -> txid)
*/
std::multimap<int64_t, uint256> m_tx_process_time;
std::multimap<int64_t, CInv> m_tx_process_time;
//! Store all the transactions a peer has recently announced
std::set<uint256> m_tx_announced;
std::set<CInv> m_tx_announced;
//! Store transactions which were requested by us, with timestamp
std::map<uint256, int64_t> m_tx_in_flight;
std::map<CInv, int64_t> m_tx_in_flight;
//! Periodically check for stuck getdata requests
int64_t m_check_expiry_timer{0};
@ -654,35 +656,40 @@ void FindNextBlocksToDownload(NodeId nodeid, unsigned int count, std::vector<con
}
}
}
} // namespace
void EraseTxRequest(const uint256& txid) EXCLUSIVE_LOCKS_REQUIRED(cs_main)
void EraseObjectRequest(const uint256& hash) EXCLUSIVE_LOCKS_REQUIRED(cs_main)
{
g_already_asked_for.erase(txid);
AssertLockHeld(cs_main);
g_already_asked_for.erase(hash);
}
int64_t GetTxRequestTime(const uint256& txid) EXCLUSIVE_LOCKS_REQUIRED(cs_main)
int64_t GetObjectRequestTime(const uint256& hash) EXCLUSIVE_LOCKS_REQUIRED(cs_main)
{
auto it = g_already_asked_for.find(txid);
AssertLockHeld(cs_main);
auto it = g_already_asked_for.find(hash);
if (it != g_already_asked_for.end()) {
return it->second;
}
return 0;
}
void UpdateTxRequestTime(const uint256& txid, int64_t request_time) EXCLUSIVE_LOCKS_REQUIRED(cs_main)
void UpdateObjectRequestTime(const uint256& hash, int64_t request_time) EXCLUSIVE_LOCKS_REQUIRED(cs_main)
{
auto it = g_already_asked_for.find(txid);
AssertLockHeld(cs_main);
auto it = g_already_asked_for.find(hash);
if (it == g_already_asked_for.end()) {
g_already_asked_for.insert(std::make_pair(txid, request_time));
g_already_asked_for.insert(std::make_pair(hash, request_time));
} else {
g_already_asked_for.update(it, request_time);
}
}
int64_t CalculateTxGetDataTime(const uint256& txid, int64_t current_time, bool use_inbound_delay) EXCLUSIVE_LOCKS_REQUIRED(cs_main)
int64_t CalculateObjectGetDataTime(const uint256& hash, int64_t current_time, bool use_inbound_delay) EXCLUSIVE_LOCKS_REQUIRED(cs_main)
{
AssertLockHeld(cs_main);
int64_t process_time;
int64_t last_request_time = GetTxRequestTime(txid);
int64_t last_request_time = GetObjectRequestTime(hash);
// First time requesting this tx
if (last_request_time == 0) {
process_time = current_time;
@ -698,26 +705,35 @@ int64_t CalculateTxGetDataTime(const uint256& txid, int64_t current_time, bool u
return process_time;
}
void RequestTx(CNodeState* state, const uint256& txid, int64_t nNow) EXCLUSIVE_LOCKS_REQUIRED(cs_main)
void RequestObject(CNodeState* state, const CInv& inv, int64_t nNow) EXCLUSIVE_LOCKS_REQUIRED(cs_main)
{
AssertLockHeld(cs_main);
CNodeState::TxDownloadState& peer_download_state = state->m_tx_download;
if (peer_download_state.m_tx_announced.size() >= MAX_PEER_TX_ANNOUNCEMENTS ||
peer_download_state.m_tx_process_time.size() >= MAX_PEER_TX_ANNOUNCEMENTS ||
peer_download_state.m_tx_announced.count(txid)) {
peer_download_state.m_tx_announced.count(inv)) {
// Too many queued announcements from this peer, or we already have
// this announcement
return;
}
peer_download_state.m_tx_announced.insert(txid);
peer_download_state.m_tx_announced.insert(inv);
// Calculate the time to try requesting this transaction. Use
// fPreferredDownload as a proxy for outbound peers.
int64_t process_time = CalculateTxGetDataTime(txid, nNow, !state->fPreferredDownload);
int64_t process_time = CalculateObjectGetDataTime(inv.hash, nNow, !state->fPreferredDownload);
peer_download_state.m_tx_process_time.emplace(process_time, txid);
peer_download_state.m_tx_process_time.emplace(process_time, inv);
}
} // namespace
void RequestObject(NodeId nodeId, const CInv& inv, int64_t nNow) EXCLUSIVE_LOCKS_REQUIRED(cs_main)
{
AssertLockHeld(cs_main);
auto* state = State(nodeId);
if (!state) {
return;
}
RequestObject(state, inv, nNow);
}
// This function is used for testing the stale tip eviction logic, see
// DoS_tests.cpp
@ -2411,7 +2427,7 @@ bool static ProcessMessage(CNode* pfrom, const std::string& strCommand, CDataStr
doubleRequestDelay = 10 * 1000000;
break;
}
RequestTx(State(pfrom->GetId()), inv.hash, nNow);
RequestObject(State(pfrom->GetId()), inv, nNow);
}
}
}
@ -2697,9 +2713,9 @@ bool static ProcessMessage(CNode* pfrom, const std::string& strCommand, CDataStr
CValidationState state;
CNodeState* nodestate = State(pfrom->GetId());
nodestate->m_tx_download.m_tx_announced.erase(inv.hash);
nodestate->m_tx_download.m_tx_in_flight.erase(inv.hash);
EraseTxRequest(inv.hash);
nodestate->m_tx_download.m_tx_announced.erase(inv);
nodestate->m_tx_download.m_tx_in_flight.erase(inv);
EraseObjectRequest(inv.hash);
if (!AlreadyHave(inv) && AcceptToMemoryPool(mempool, state, ptx, &fMissingInputs /* pfMissingInputs */,
false /* bypass_limits */, 0 /* nAbsurdFee */)) {
@ -2747,11 +2763,11 @@ bool static ProcessMessage(CNode* pfrom, const std::string& strCommand, CDataStr
for (const CTxIn& txin : tx.vin) {
CInv _inv(MSG_TX, txin.prevout.hash);
pfrom->AddInventoryKnown(_inv);
if (!AlreadyHave(_inv)) RequestTx(State(pfrom->GetId()), _inv.hash, nNow);
if (!AlreadyHave(_inv)) RequestObject(State(pfrom->GetId()), _inv, nNow);
// We don't know if the previous tx was a regular or a mixing one, try both
CInv _inv2(MSG_DSTX, txin.prevout.hash);
pfrom->AddInventoryKnown(_inv2);
if (!AlreadyHave(_inv2)) RequestTx(State(pfrom->GetId()), _inv2.hash, nNow);
if (!AlreadyHave(_inv2)) RequestObject(State(pfrom->GetId()), _inv2, nNow);
}
AddOrphanTx(ptx, pfrom->GetId());
@ -3367,17 +3383,17 @@ bool static ProcessMessage(CNode* pfrom, const std::string& strCommand, CDataStr
vRecv >> vInv;
if (vInv.size() <= MAX_PEER_TX_IN_FLIGHT + MAX_BLOCKS_IN_TRANSIT_PER_PEER) {
for (CInv &inv : vInv) {
if (inv.type == MSG_TX) {
if (inv.IsKnownType()) {
// If we receive a NOTFOUND message for a txid we requested, erase
// it from our data structures for this peer.
auto in_flight_it = state->m_tx_download.m_tx_in_flight.find(inv.hash);
auto in_flight_it = state->m_tx_download.m_tx_in_flight.find(inv);
if (in_flight_it == state->m_tx_download.m_tx_in_flight.end()) {
// Skip any further work if this is a spurious NOTFOUND
// message.
continue;
}
state->m_tx_download.m_tx_in_flight.erase(in_flight_it);
state->m_tx_download.m_tx_announced.erase(inv.hash);
state->m_tx_download.m_tx_announced.erase(inv);
}
}
}
@ -4248,17 +4264,17 @@ bool PeerLogicValidation::SendMessages(CNode* pto, std::atomic<bool>& interruptM
state.m_tx_download.m_check_expiry_timer = nNow + TX_EXPIRY_INTERVAL/2 + GetRand(TX_EXPIRY_INTERVAL);
}
// DASH this code also handles non-TXs (Dash specific messages)
auto& tx_process_time = state.m_tx_download.m_tx_process_time;
while (!tx_process_time.empty() && tx_process_time.begin()->first <= nNow && state.m_tx_download.m_tx_in_flight.size() < MAX_PEER_TX_IN_FLIGHT) {
const uint256 txid = tx_process_time.begin()->second;
const CInv inv = tx_process_time.begin()->second;
// Erase this entry from tx_process_time (it may be added back for
// processing at a later time, see below)
tx_process_time.erase(tx_process_time.begin());
CInv inv(MSG_TX, txid);
if (!AlreadyHave(inv)) {
// If this transaction was last requested more than 1 minute ago,
// then request.
int64_t last_request_time = GetTxRequestTime(inv.hash);
int64_t last_request_time = GetObjectRequestTime(inv.hash);
if (last_request_time <= nNow - GETDATA_TX_INTERVAL) {
LogPrint(BCLog::NET, "Requesting %s peer=%d\n", inv.ToString(), pto->GetId());
vGetData.push_back(inv);
@ -4266,20 +4282,20 @@ bool PeerLogicValidation::SendMessages(CNode* pto, std::atomic<bool>& interruptM
connman->PushMessage(pto, msgMaker.Make(NetMsgType::GETDATA, vGetData));
vGetData.clear();
}
UpdateTxRequestTime(inv.hash, nNow);
state.m_tx_download.m_tx_in_flight.emplace(inv.hash, nNow);
UpdateObjectRequestTime(inv.hash, nNow);
state.m_tx_download.m_tx_in_flight.emplace(inv, nNow);
} else {
// This transaction is in flight from someone else; queue
// up processing to happen after the download times out
// (with a slight delay for inbound peers, to prefer
// requests to outbound peers).
int64_t next_process_time = CalculateTxGetDataTime(txid, nNow, !state.fPreferredDownload);
int64_t next_process_time = CalculateObjectGetDataTime(txid, nNow, !state.fPreferredDownload);
tx_process_time.emplace(next_process_time, txid);
}
} else {
// We have already seen this transaction, no need to download.
state.m_tx_download.m_tx_announced.erase(inv.hash);
state.m_tx_download.m_tx_in_flight.erase(inv.hash);
state.m_tx_download.m_tx_announced.erase(inv);
state.m_tx_download.m_tx_in_flight.erase(inv);
}
}

3
src/net_processing.h
View File

@ -84,4 +84,7 @@ bool GetNodeStateStats(NodeId nodeid, CNodeStateStats &stats);
void Misbehaving(NodeId nodeid, int howmuch, const std::string& message="");
bool IsBanned(NodeId nodeid);
void EraseObjectRequest(const uint256& hash);
void RequestObject(NodeId nodeId, const CInv& inv, int64_t nNow);
#endif // BITCOIN_NET_PROCESSING_H