Merge bitcoin/bitcoin#21562: [net processing] Various tidying up of PeerManagerImpl ctor

fde1bf4f6136638e84cdf9806eedaae08e841bbf [net processing] Default initialize m_recent_confirmed_transactions (John Newbery)
37dcd12d539e4a875581fa049aa0f7fafeb932a4 scripted-diff: Rename recentRejects (John Newbery)
cd9902ac5054c01228d52616bf85f7196364d4ff [net processing] Default initialize recentRejects (John Newbery)
a28bfd1d4cfa523a6abf3832dbfd6183cd546944 [net processing] Default initialize m_stale_tip_check_time (John Newbery)
9190b01d8dcf03b74e9b9e1653688a97ac171b37 [net processing] Add Orphanage empty consistency check (John Newbery)

Pull request description:

  - Use default initialization of PeerManagerImpl members where possible
  - Remove unique_ptr indirection where it's not needed

ACKs for top commit:
  MarcoFalke:
    ACK fde1bf4f6136638e84cdf9806eedaae08e841bbf 👞
  theStack:
    re-ACK fde1bf4f6136638e84cdf9806eedaae08e841bbf

Tree-SHA512: 7ddedcc972df8e933e1fbe5c88b8ea17df89e1e58fc769518512c5540e49dc8eddb3f47e78d1329a6fc5644d2c1d11c981f681fd633f5218bfa4b3e6a86f3d7b

4 files changed, 41 insertions, 40 deletions

diff --git a/src/net_processing.cpp b/src/net_processing.cpp
index dc36b69802..2538904ade 100644
--- a/src/net_processing.cpp
+++ b/src/net_processing.cpp
@@ -397,7 +397,8 @@ private:
     /** The height of the best chain */
     std::atomic<int> m_best_height{-1};
 
-    int64_t m_stale_tip_check_time; //!< Next time to check for stale tip
+    /** Next time to check for stale tip */
+    int64_t m_stale_tip_check_time{0};
 
     /** Whether this node is running in blocks only mode */
     const bool m_ignore_incoming_txs;
@@ -470,16 +471,26 @@ private:
      *
      * Memory used: 1.3 MB
      */
-    std::unique_ptr<CRollingBloomFilter> recentRejects GUARDED_BY(cs_main);
+    CRollingBloomFilter m_recent_rejects GUARDED_BY(::cs_main){120'000, 0.000'001};
     uint256 hashRecentRejectsChainTip GUARDED_BY(cs_main);
 
     /*
      * Filter for transactions that have been recently confirmed.
      * We use this to avoid requesting transactions that have already been
      * confirnmed.
+     *
+     * Blocks don't typically have more than 4000 transactions, so this should
+     * be at least six blocks (~1 hr) worth of transactions that we can store,
+     * inserting both a txid and wtxid for every observed transaction.
+     * If the number of transactions appearing in a block goes up, or if we are
+     * seeing getdata requests more than an hour after initial announcement, we
+     * can increase this number.
+     * The false positive rate of 1/1M should come out to less than 1
+     * transaction per day that would be inadvertently ignored (which is the
+     * same probability that we have in the reject filter).
      */
     Mutex m_recent_confirmed_transactions_mutex;
-    std::unique_ptr<CRollingBloomFilter> m_recent_confirmed_transactions GUARDED_BY(m_recent_confirmed_transactions_mutex);
+    CRollingBloomFilter m_recent_confirmed_transactions GUARDED_BY(m_recent_confirmed_transactions_mutex){48'000, 0.000'001};
 
     /** Have we requested this block from a peer */
     bool IsBlockRequested(const uint256& hash) EXCLUSIVE_LOCKS_REQUIRED(cs_main);
@@ -1195,6 +1206,7 @@ void PeerManagerImpl::FinalizeNode(const CNode& node)
         assert(m_outbound_peers_with_protect_from_disconnect == 0);
         assert(m_wtxid_relay_peers == 0);
         assert(m_txrequest.Size() == 0);
+        assert(m_orphanage.Size() == 0);
     }
     } // cs_main
     if (node.fSuccessfullyConnected && misbehavior == 0 &&
@@ -1399,23 +1411,8 @@ PeerManagerImpl::PeerManagerImpl(const CChainParams& chainparams, CConnman& conn
       m_banman(banman),
       m_chainman(chainman),
       m_mempool(pool),
-      m_stale_tip_check_time(0),
       m_ignore_incoming_txs(ignore_incoming_txs)
 {
-    // Initialize global variables that cannot be constructed at startup.
-    recentRejects.reset(new CRollingBloomFilter(120000, 0.000001));
-
-    // Blocks don't typically have more than 4000 transactions, so this should
-    // be at least six blocks (~1 hr) worth of transactions that we can store,
-    // inserting both a txid and wtxid for every observed transaction.
-    // If the number of transactions appearing in a block goes up, or if we are
-    // seeing getdata requests more than an hour after initial announcement, we
-    // can increase this number.
-    // The false positive rate of 1/1M should come out to less than 1
-    // transaction per day that would be inadvertently ignored (which is the
-    // same probability that we have in the reject filter).
-    m_recent_confirmed_transactions.reset(new CRollingBloomFilter(48000, 0.000001));
-
     // Stale tip checking and peer eviction are on two different timers, but we
     // don't want them to get out of sync due to drift in the scheduler, so we
     // combine them in one function and schedule at the quicker (peer-eviction)
@@ -1441,9 +1438,9 @@ void PeerManagerImpl::BlockConnected(const std::shared_ptr<const CBlock>& pblock
     {
         LOCK(m_recent_confirmed_transactions_mutex);
         for (const auto& ptx : pblock->vtx) {
-            m_recent_confirmed_transactions->insert(ptx->GetHash());
+            m_recent_confirmed_transactions.insert(ptx->GetHash());
             if (ptx->GetHash() != ptx->GetWitnessHash()) {
-                m_recent_confirmed_transactions->insert(ptx->GetWitnessHash());
+                m_recent_confirmed_transactions.insert(ptx->GetWitnessHash());
             }
         }
     }
@@ -1467,7 +1464,7 @@ void PeerManagerImpl::BlockDisconnected(const std::shared_ptr<const CBlock> &blo
     // presumably the most common case of relaying a confirmed transaction
     // should be just after a new block containing it is found.
     LOCK(m_recent_confirmed_transactions_mutex);
-    m_recent_confirmed_transactions->reset();
+    m_recent_confirmed_transactions.reset();
 }
 
 // All of the following cache a recent block, and are protected by cs_most_recent_block
@@ -1607,14 +1604,13 @@ void PeerManagerImpl::BlockChecked(const CBlock& block, const BlockValidationSta
 
 bool PeerManagerImpl::AlreadyHaveTx(const GenTxid& gtxid)
 {
-    assert(recentRejects);
     if (m_chainman.ActiveChain().Tip()->GetBlockHash() != hashRecentRejectsChainTip) {
         // If the chain tip has changed previously rejected transactions
         // might be now valid, e.g. due to a nLockTime'd tx becoming valid,
         // or a double-spend. Reset the rejects filter and give those
         // txs a second chance.
         hashRecentRejectsChainTip = m_chainman.ActiveChain().Tip()->GetBlockHash();
-        recentRejects->reset();
+        m_recent_rejects.reset();
     }
 
     const uint256& hash = gtxid.GetHash();
@@ -1623,10 +1619,10 @@ bool PeerManagerImpl::AlreadyHaveTx(const GenTxid& gtxid)
 
     {
         LOCK(m_recent_confirmed_transactions_mutex);
-        if (m_recent_confirmed_transactions->contains(hash)) return true;
+        if (m_recent_confirmed_transactions.contains(hash)) return true;
     }
 
-    return recentRejects->contains(hash) || m_mempool.exists(gtxid);
+    return m_recent_rejects.contains(hash) || m_mempool.exists(gtxid);
 }
 
 bool PeerManagerImpl::AlreadyHaveBlock(const uint256& block_hash)
@@ -2245,8 +2241,7 @@ void PeerManagerImpl::ProcessOrphanTx(std::set<uint256>& orphan_work_set)
                 // See also comments in https://github.com/bitcoin/bitcoin/pull/18044#discussion_r443419034
                 // for concerns around weakening security of unupgraded nodes
                 // if we start doing this too early.
-                assert(recentRejects);
-                recentRejects->insert(porphanTx->GetWitnessHash());
+                m_recent_rejects.insert(porphanTx->GetWitnessHash());
                 // If the transaction failed for TX_INPUTS_NOT_STANDARD,
                 // then we know that the witness was irrelevant to the policy
                 // failure, since this check depends only on the txid
@@ -2258,7 +2253,7 @@ void PeerManagerImpl::ProcessOrphanTx(std::set<uint256>& orphan_work_set)
                 if (state.GetResult() == TxValidationResult::TX_INPUTS_NOT_STANDARD && porphanTx->GetWitnessHash() != porphanTx->GetHash()) {
                     // We only add the txid if it differs from the wtxid, to
                     // avoid wasting entries in the rolling bloom filter.
-                    recentRejects->insert(porphanTx->GetHash());
+                    m_recent_rejects.insert(porphanTx->GetHash());
                 }
             }
             m_orphanage.EraseTx(orphanHash);
@@ -3259,7 +3254,7 @@ void PeerManagerImpl::ProcessMessage(CNode& pfrom, const std::string& msg_type,
             std::sort(unique_parents.begin(), unique_parents.end());
             unique_parents.erase(std::unique(unique_parents.begin(), unique_parents.end()), unique_parents.end());
             for (const uint256& parent_txid : unique_parents) {
-                if (recentRejects->contains(parent_txid)) {
+                if (m_recent_rejects.contains(parent_txid)) {
                     fRejectedParents = true;
                     break;
                 }
@@ -3300,8 +3295,8 @@ void PeerManagerImpl::ProcessMessage(CNode& pfrom, const std::string& msg_type,
                 // regardless of what witness is provided, we will not accept
                 // this, so we don't need to allow for redownload of this txid
                 // from any of our non-wtxidrelay peers.
-                recentRejects->insert(tx.GetHash());
-                recentRejects->insert(tx.GetWitnessHash());
+                m_recent_rejects.insert(tx.GetHash());
+                m_recent_rejects.insert(tx.GetWitnessHash());
                 m_txrequest.ForgetTxHash(tx.GetHash());
                 m_txrequest.ForgetTxHash(tx.GetWitnessHash());
             }
@@ -3320,8 +3315,7 @@ void PeerManagerImpl::ProcessMessage(CNode& pfrom, const std::string& msg_type,
                 // See also comments in https://github.com/bitcoin/bitcoin/pull/18044#discussion_r443419034
                 // for concerns around weakening security of unupgraded nodes
                 // if we start doing this too early.
-                assert(recentRejects);
-                recentRejects->insert(tx.GetWitnessHash());
+                m_recent_rejects.insert(tx.GetWitnessHash());
                 m_txrequest.ForgetTxHash(tx.GetWitnessHash());
                 // If the transaction failed for TX_INPUTS_NOT_STANDARD,
                 // then we know that the witness was irrelevant to the policy
@@ -3332,7 +3326,7 @@ void PeerManagerImpl::ProcessMessage(CNode& pfrom, const std::string& msg_type,
                 // transactions are later received (resulting in
                 // parent-fetching by txid via the orphan-handling logic).
                 if (state.GetResult() == TxValidationResult::TX_INPUTS_NOT_STANDARD && tx.GetWitnessHash() != tx.GetHash()) {
-                    recentRejects->insert(tx.GetHash());
+                    m_recent_rejects.insert(tx.GetHash());
                     m_txrequest.ForgetTxHash(tx.GetHash());
                 }
                 if (RecursiveDynamicUsage(*ptx) < 100000) {
@@ -3341,21 +3335,21 @@ void PeerManagerImpl::ProcessMessage(CNode& pfrom, const std::string& msg_type,
             }
         }
 
-        // If a tx has been detected by recentRejects, we will have reached
+        // If a tx has been detected by m_recent_rejects, we will have reached
         // this point and the tx will have been ignored. Because we haven't run
         // the tx through AcceptToMemoryPool, we won't have computed a DoS
         // score for it or determined exactly why we consider it invalid.
         //
         // This means we won't penalize any peer subsequently relaying a DoSy
         // tx (even if we penalized the first peer who gave it to us) because
-        // we have to account for recentRejects showing false positives. In
+        // we have to account for m_recent_rejects showing false positives. In
         // other words, we shouldn't penalize a peer if we aren't *sure* they
         // submitted a DoSy tx.
         //
-        // Note that recentRejects doesn't just record DoSy or invalid
+        // Note that m_recent_rejects doesn't just record DoSy or invalid
         // transactions, but any tx not accepted by the mempool, which may be
         // due to node policy (vs. consensus). So we can't blanket penalize a
-        // peer simply for relaying a tx that our recentRejects has caught,
+        // peer simply for relaying a tx that our m_recent_rejects has caught,
         // regardless of false positives.
 
         if (state.IsInvalid()) {
diff --git a/src/txorphanage.h b/src/txorphanage.h
index e4266e470a..24c8318f36 100644
--- a/src/txorphanage.h
+++ b/src/txorphanage.h
@@ -47,6 +47,13 @@ public:
      * (ie orphans that may have found their final missing parent, and so should be reconsidered for the mempool) */
     void AddChildrenToWorkSet(const CTransaction& tx, std::set<uint256>& orphan_work_set) const EXCLUSIVE_LOCKS_REQUIRED(g_cs_orphans);
 
+    /** Return how many entries exist in the orphange */
+    size_t Size() LOCKS_EXCLUDED(::g_cs_orphans)
+    {
+        LOCK(::g_cs_orphans);
+        return m_orphans.size();
+    }
+
 protected:
     struct OrphanTx {
         CTransactionRef tx;
diff --git a/test/functional/mempool_reorg.py b/test/functional/mempool_reorg.py
index bcc6aa7bcc..b5086e1df1 100755
--- a/test/functional/mempool_reorg.py
+++ b/test/functional/mempool_reorg.py
@@ -80,7 +80,7 @@ class MempoolCoinbaseTest(BitcoinTestFramework):
         self.log.info("Generate a block")
         last_block = self.nodes[0].generate(1)
         # Sync blocks, so that peer 1 gets the block before timelock_tx
-        # Otherwise, peer 1 would put the timelock_tx in recentRejects
+        # Otherwise, peer 1 would put the timelock_tx in m_recent_rejects
         self.sync_all()
 
         self.log.info("The time-locked transaction can now be spent")
diff --git a/test/functional/p2p_permissions.py b/test/functional/p2p_permissions.py
index 594a28d662..8b285907c5 100755
--- a/test/functional/p2p_permissions.py
+++ b/test/functional/p2p_permissions.py
@@ -130,7 +130,7 @@ class P2PPermissionsTests(BitcoinTestFramework):
         tx.vout[0].nValue += 1
         txid = tx.rehash()
         # Send the transaction twice. The first time, it'll be rejected by ATMP because it conflicts
-        # with a mempool transaction. The second time, it'll be in the recentRejects filter.
+        # with a mempool transaction. The second time, it'll be in the m_recent_rejects filter.
         p2p_rebroadcast_wallet.send_txs_and_test(
             [tx],
             self.nodes[1],