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1 : : // Copyright (c) 2021-2022 The Bitcoin Core developers
2 : : // Distributed under the MIT software license, see the accompanying
3 : : // file COPYING or http://www.opensource.org/licenses/mit-license.php.
4 : :
5 : : #include <txorphanage.h>
6 : :
7 : : #include <consensus/validation.h>
8 : : #include <logging.h>
9 : : #include <policy/policy.h>
10 : : #include <primitives/transaction.h>
11 : :
12 : : #include <cassert>
13 : :
14 : : /** Expiration time for orphan transactions in seconds */
15 : : static constexpr int64_t ORPHAN_TX_EXPIRE_TIME = 20 * 60;
16 : : /** Minimum time between orphan transactions expire time checks in seconds */
17 : : static constexpr int64_t ORPHAN_TX_EXPIRE_INTERVAL = 5 * 60;
18 : :
19 : :
20 : 0 : bool TxOrphanage::AddTx(const CTransactionRef& tx, NodeId peer)
21 : : {
22 : 0 : LOCK(m_mutex);
23 : :
24 [ # # ]: 0 : const Txid& hash = tx->GetHash();
25 [ # # ]: 0 : const Wtxid& wtxid = tx->GetWitnessHash();
26 [ # # ][ # # ]: 0 : if (m_orphans.count(hash))
27 : 0 : return false;
28 : :
29 : : // Ignore big transactions, to avoid a
30 : : // send-big-orphans memory exhaustion attack. If a peer has a legitimate
31 : : // large transaction with a missing parent then we assume
32 : : // it will rebroadcast it later, after the parent transaction(s)
33 : : // have been mined or received.
34 : : // 100 orphans, each of which is at most 100,000 bytes big is
35 : : // at most 10 megabytes of orphans and somewhat more byprev index (in the worst case):
36 [ # # ]: 0 : unsigned int sz = GetTransactionWeight(*tx);
37 [ # # ]: 0 : if (sz > MAX_STANDARD_TX_WEIGHT)
38 : : {
39 [ # # ][ # # ]: 0 : LogPrint(BCLog::TXPACKAGES, "ignoring large orphan tx (size: %u, txid: %s, wtxid: %s)\n", sz, hash.ToString(), wtxid.ToString());
[ # # ][ # # ]
[ # # ][ # # ]
[ # # ]
40 : 0 : return false;
41 : : }
42 : :
43 [ # # ][ # # ]: 0 : auto ret = m_orphans.emplace(hash, OrphanTx{tx, peer, GetTime() + ORPHAN_TX_EXPIRE_TIME, m_orphan_list.size()});
44 [ # # ]: 0 : assert(ret.second);
45 [ # # ]: 0 : m_orphan_list.push_back(ret.first);
46 : : // Allow for lookups in the orphan pool by wtxid, as well as txid
47 [ # # ][ # # ]: 0 : m_wtxid_to_orphan_it.emplace(tx->GetWitnessHash(), ret.first);
48 [ # # ]: 0 : for (const CTxIn& txin : tx->vin) {
49 [ # # ][ # # ]: 0 : m_outpoint_to_orphan_it[txin.prevout].insert(ret.first);
50 : : }
51 : :
52 [ # # ][ # # ]: 0 : LogPrint(BCLog::TXPACKAGES, "stored orphan tx %s (wtxid=%s) (mapsz %u outsz %u)\n", hash.ToString(), wtxid.ToString(),
[ # # ][ # # ]
[ # # ][ # # ]
[ # # ]
53 : : m_orphans.size(), m_outpoint_to_orphan_it.size());
54 : 0 : return true;
55 : 0 : }
56 : :
57 : 0 : int TxOrphanage::EraseTx(const Txid& txid)
58 : : {
59 : 0 : LOCK(m_mutex);
60 [ # # ]: 0 : return EraseTxNoLock(txid);
61 : 0 : }
62 : :
63 : 0 : int TxOrphanage::EraseTxNoLock(const Txid& txid)
64 : : {
65 : 0 : AssertLockHeld(m_mutex);
66 : 0 : std::map<Txid, OrphanTx>::iterator it = m_orphans.find(txid);
67 [ # # ]: 0 : if (it == m_orphans.end())
68 : 0 : return 0;
69 [ # # ]: 0 : for (const CTxIn& txin : it->second.tx->vin)
70 : : {
71 : 0 : auto itPrev = m_outpoint_to_orphan_it.find(txin.prevout);
72 [ # # ]: 0 : if (itPrev == m_outpoint_to_orphan_it.end())
73 : 0 : continue;
74 : 0 : itPrev->second.erase(it);
75 [ # # ]: 0 : if (itPrev->second.empty())
76 : 0 : m_outpoint_to_orphan_it.erase(itPrev);
77 : : }
78 : :
79 : 0 : size_t old_pos = it->second.list_pos;
80 [ # # ]: 0 : assert(m_orphan_list[old_pos] == it);
81 [ # # ]: 0 : if (old_pos + 1 != m_orphan_list.size()) {
82 : : // Unless we're deleting the last entry in m_orphan_list, move the last
83 : : // entry to the position we're deleting.
84 : 0 : auto it_last = m_orphan_list.back();
85 : 0 : m_orphan_list[old_pos] = it_last;
86 : 0 : it_last->second.list_pos = old_pos;
87 : 0 : }
88 : 0 : const auto& wtxid = it->second.tx->GetWitnessHash();
89 [ # # ][ # # ]: 0 : LogPrint(BCLog::TXPACKAGES, " removed orphan tx %s (wtxid=%s)\n", txid.ToString(), wtxid.ToString());
[ # # ][ # # ]
[ # # ][ # # ]
90 : 0 : m_orphan_list.pop_back();
91 : 0 : m_wtxid_to_orphan_it.erase(it->second.tx->GetWitnessHash());
92 : :
93 : 0 : m_orphans.erase(it);
94 : 0 : return 1;
95 : 0 : }
96 : :
97 : 0 : void TxOrphanage::EraseForPeer(NodeId peer)
98 : : {
99 : 0 : LOCK(m_mutex);
100 : :
101 [ # # ]: 0 : m_peer_work_set.erase(peer);
102 : :
103 : 0 : int nErased = 0;
104 : 0 : std::map<Txid, OrphanTx>::iterator iter = m_orphans.begin();
105 [ # # ]: 0 : while (iter != m_orphans.end())
106 : : {
107 : 0 : std::map<Txid, OrphanTx>::iterator maybeErase = iter++; // increment to avoid iterator becoming invalid
108 [ # # ]: 0 : if (maybeErase->second.fromPeer == peer)
109 : : {
110 [ # # ][ # # ]: 0 : nErased += EraseTxNoLock(maybeErase->second.tx->GetHash());
111 : 0 : }
112 : : }
113 [ # # ][ # # ]: 0 : if (nErased > 0) LogPrint(BCLog::TXPACKAGES, "Erased %d orphan tx from peer=%d\n", nErased, peer);
[ # # ][ # # ]
[ # # ][ # # ]
114 : 0 : }
115 : :
116 : 0 : void TxOrphanage::LimitOrphans(unsigned int max_orphans, FastRandomContext& rng)
117 : : {
118 : 0 : LOCK(m_mutex);
119 : :
120 : 0 : unsigned int nEvicted = 0;
121 : : static int64_t nNextSweep;
122 [ # # ]: 0 : int64_t nNow = GetTime();
123 [ # # ]: 0 : if (nNextSweep <= nNow) {
124 : : // Sweep out expired orphan pool entries:
125 : 0 : int nErased = 0;
126 : 0 : int64_t nMinExpTime = nNow + ORPHAN_TX_EXPIRE_TIME - ORPHAN_TX_EXPIRE_INTERVAL;
127 : 0 : std::map<Txid, OrphanTx>::iterator iter = m_orphans.begin();
128 [ # # ]: 0 : while (iter != m_orphans.end())
129 : : {
130 : 0 : std::map<Txid, OrphanTx>::iterator maybeErase = iter++;
131 [ # # ]: 0 : if (maybeErase->second.nTimeExpire <= nNow) {
132 [ # # ][ # # ]: 0 : nErased += EraseTxNoLock(maybeErase->second.tx->GetHash());
133 : 0 : } else {
134 [ # # ]: 0 : nMinExpTime = std::min(maybeErase->second.nTimeExpire, nMinExpTime);
135 : : }
136 : : }
137 : : // Sweep again 5 minutes after the next entry that expires in order to batch the linear scan.
138 : 0 : nNextSweep = nMinExpTime + ORPHAN_TX_EXPIRE_INTERVAL;
139 [ # # ][ # # ]: 0 : if (nErased > 0) LogPrint(BCLog::TXPACKAGES, "Erased %d orphan tx due to expiration\n", nErased);
[ # # ][ # # ]
[ # # ][ # # ]
140 : 0 : }
141 [ # # ]: 0 : while (m_orphans.size() > max_orphans)
142 : : {
143 : : // Evict a random orphan:
144 : 0 : size_t randompos = rng.randrange(m_orphan_list.size());
145 [ # # ]: 0 : EraseTxNoLock(m_orphan_list[randompos]->first);
146 : 0 : ++nEvicted;
147 : : }
148 [ # # ][ # # ]: 0 : if (nEvicted > 0) LogPrint(BCLog::TXPACKAGES, "orphanage overflow, removed %u tx\n", nEvicted);
[ # # ][ # # ]
[ # # ][ # # ]
149 : 0 : }
150 : :
151 : 0 : void TxOrphanage::AddChildrenToWorkSet(const CTransaction& tx)
152 : : {
153 : 0 : LOCK(m_mutex);
154 : :
155 : :
156 [ # # ]: 0 : for (unsigned int i = 0; i < tx.vout.size(); i++) {
157 [ # # ][ # # ]: 0 : const auto it_by_prev = m_outpoint_to_orphan_it.find(COutPoint(tx.GetHash(), i));
[ # # ]
158 [ # # ]: 0 : if (it_by_prev != m_outpoint_to_orphan_it.end()) {
159 [ # # ]: 0 : for (const auto& elem : it_by_prev->second) {
160 : : // Get this source peer's work set, emplacing an empty set if it didn't exist
161 : : // (note: if this peer wasn't still connected, we would have removed the orphan tx already)
162 [ # # ]: 0 : std::set<Txid>& orphan_work_set = m_peer_work_set.try_emplace(elem->second.fromPeer).first->second;
163 : : // Add this tx to the work set
164 [ # # ]: 0 : orphan_work_set.insert(elem->first);
165 [ # # ][ # # ]: 0 : LogPrint(BCLog::TXPACKAGES, "added %s (wtxid=%s) to peer %d workset\n",
[ # # ][ # # ]
[ # # ][ # # ]
[ # # ][ # # ]
[ # # ]
166 : : tx.GetHash().ToString(), tx.GetWitnessHash().ToString(), elem->second.fromPeer);
167 : : }
168 : 0 : }
169 : 0 : }
170 : 0 : }
171 : :
172 : 0 : bool TxOrphanage::HaveTx(const GenTxid& gtxid) const
173 : : {
174 : 0 : LOCK(m_mutex);
175 [ # # ][ # # ]: 0 : if (gtxid.IsWtxid()) {
176 [ # # ][ # # ]: 0 : return m_wtxid_to_orphan_it.count(Wtxid::FromUint256(gtxid.GetHash()));
[ # # ]
177 : : } else {
178 [ # # ][ # # ]: 0 : return m_orphans.count(Txid::FromUint256(gtxid.GetHash()));
[ # # ]
179 : : }
180 : 0 : }
181 : :
182 : 0 : CTransactionRef TxOrphanage::GetTxToReconsider(NodeId peer)
183 : : {
184 : 0 : LOCK(m_mutex);
185 : :
186 [ # # ]: 0 : auto work_set_it = m_peer_work_set.find(peer);
187 [ # # ]: 0 : if (work_set_it != m_peer_work_set.end()) {
188 : 0 : auto& work_set = work_set_it->second;
189 [ # # ]: 0 : while (!work_set.empty()) {
190 : 0 : Txid txid = *work_set.begin();
191 [ # # ]: 0 : work_set.erase(work_set.begin());
192 : :
193 [ # # ]: 0 : const auto orphan_it = m_orphans.find(txid);
194 [ # # ]: 0 : if (orphan_it != m_orphans.end()) {
195 : 0 : return orphan_it->second.tx;
196 : : }
197 : : }
198 : 0 : }
199 : 0 : return nullptr;
200 : 0 : }
201 : :
202 : 0 : bool TxOrphanage::HaveTxToReconsider(NodeId peer)
203 : : {
204 : 0 : LOCK(m_mutex);
205 : :
206 [ # # ]: 0 : auto work_set_it = m_peer_work_set.find(peer);
207 [ # # ]: 0 : if (work_set_it != m_peer_work_set.end()) {
208 : 0 : auto& work_set = work_set_it->second;
209 : 0 : return !work_set.empty();
210 : : }
211 : 0 : return false;
212 : 0 : }
213 : :
214 : 0 : void TxOrphanage::EraseForBlock(const CBlock& block)
215 : : {
216 : 0 : LOCK(m_mutex);
217 : :
218 : 0 : std::vector<Txid> vOrphanErase;
219 : :
220 [ # # ]: 0 : for (const CTransactionRef& ptx : block.vtx) {
221 : 0 : const CTransaction& tx = *ptx;
222 : :
223 : : // Which orphan pool entries must we evict?
224 [ # # ]: 0 : for (const auto& txin : tx.vin) {
225 [ # # ]: 0 : auto itByPrev = m_outpoint_to_orphan_it.find(txin.prevout);
226 [ # # ]: 0 : if (itByPrev == m_outpoint_to_orphan_it.end()) continue;
227 [ # # ]: 0 : for (auto mi = itByPrev->second.begin(); mi != itByPrev->second.end(); ++mi) {
228 : 0 : const CTransaction& orphanTx = *(*mi)->second.tx;
229 [ # # ]: 0 : const auto& orphanHash = orphanTx.GetHash();
230 [ # # ]: 0 : vOrphanErase.push_back(orphanHash);
231 : 0 : }
232 : : }
233 : : }
234 : :
235 : : // Erase orphan transactions included or precluded by this block
236 [ # # ]: 0 : if (vOrphanErase.size()) {
237 : 0 : int nErased = 0;
238 [ # # ]: 0 : for (const auto& orphanHash : vOrphanErase) {
239 [ # # ]: 0 : nErased += EraseTxNoLock(orphanHash);
240 : : }
241 [ # # ][ # # ]: 0 : LogPrint(BCLog::TXPACKAGES, "Erased %d orphan tx included or conflicted by block\n", nErased);
[ # # ][ # # ]
[ # # ]
242 : 0 : }
243 : 0 : }
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