Merge #17477: Remove the mempool's NotifyEntryAdded and NotifyEntryRemoved signals

e57980b4738c10344baf136de3e050a3cb958ca5 [mempool] Remove NotifyEntryAdded and NotifyEntryRemoved callbacks (John Newbery)
2dd561f36124972d2364f941de9c3417c65f05b6 [validation] Remove pool member from ConnectTrace (John Newbery)
969b65f3f527631ede1a31c7855151e5c5d91f8f [validation] Remove NotifyEntryRemoved callback from ConnectTrace (John Newbery)
5613f9842b4000fed088b8cf7b99674c328d15e1 [validation] Remove conflictedTxs from PerBlockConnectTrace (John Newbery)
cdb893443cc16edf974f099b8485e04b3db1b1d7 [validation interface] Remove vtxConflicted from BlockConnected (John Newbery)
1168394d759b13af68acec6d5bfa04aaa24561f8 [wallet] Notify conflicted transactions in TransactionRemovedFromMempool (John Newbery)

Pull request description:

  These boost signals were added in #9371, before we had a `TransactionRemovedFromMempool` method in the validation interface. The `NotifyEntryAdded` callback was used by validation to build a vector of conflicted transactions when connecting a block, which the wallet was notified of in the `BlockConnected` CValidationInterface callback.

  Now that we have a `TransactionRemovedFromMempool` callback, we can fire that signal directly from the mempool for conflicted transactions.

  Note that #9371 was implemented to ensure `-walletnotify` events were fired for these conflicted transaction. We inadvertently stopped sending these notifications in #16624 (Sep 2019 commit 7e89994). We should probably fix that, but in a different PR.

ACKs for top commit:
  jonatack:
    Re-ACK e57980b
  ryanofsky:
    Code review ACK e57980b4738c10344baf136de3e050a3cb958ca5, no code changes since previous review, but helpful new code comments have been added and the PR description is now more clear about where the old code came from

Tree-SHA512: 3bdbaf1ef2731e788462d4756e69c42a1efdcf168691ce1bbfdaa4b7b55ac3c5b1fd4ab7b90bcdec653703600501b4224d252cfc086aef28f9ce0da3b0563a69

3 files changed, 5 insertions, 5 deletions

diff --git a/src/interfaces/chain.cpp b/src/interfaces/chain.cpp
index 643bb58d56..d16f4e7ccc 100644
--- a/src/interfaces/chain.cpp
+++ b/src/interfaces/chain.cpp
@@ -172,11 +172,9 @@ public:
     {
         m_notifications->TransactionRemovedFromMempool(tx);
     }
-    void BlockConnected(const std::shared_ptr<const CBlock>& block,
-        const CBlockIndex* index,
-        const std::vector<CTransactionRef>& tx_conflicted) override
+    void BlockConnected(const std::shared_ptr<const CBlock>& block, const CBlockIndex* index) override
     {
-        m_notifications->BlockConnected(*block, tx_conflicted, index->nHeight);
+        m_notifications->BlockConnected(*block, index->nHeight);
     }
     void BlockDisconnected(const std::shared_ptr<const CBlock>& block, const CBlockIndex* index) override
     {
diff --git a/src/interfaces/chain.h b/src/interfaces/chain.h
index 7304f82749..03a600d5a3 100644
--- a/src/interfaces/chain.h
+++ b/src/interfaces/chain.h
@@ -219,7 +219,7 @@ public:
         virtual ~Notifications() {}
         virtual void TransactionAddedToMempool(const CTransactionRef& tx) {}
         virtual void TransactionRemovedFromMempool(const CTransactionRef& ptx) {}
-        virtual void BlockConnected(const CBlock& block, const std::vector<CTransactionRef>& tx_conflicted, int height) {}
+        virtual void BlockConnected(const CBlock& block, int height) {}
         virtual void BlockDisconnected(const CBlock& block, int height) {}
         virtual void UpdatedBlockTip() {}
         virtual void ChainStateFlushed(const CBlockLocator& locator) {}
diff --git a/src/interfaces/node.cpp b/src/interfaces/node.cpp
index 8a64a9d26a..b720a63017 100644
--- a/src/interfaces/node.cpp
+++ b/src/interfaces/node.cpp
@@ -37,6 +37,8 @@
 
 #include <univalue.h>
 
+#include <boost/signals2/signal.hpp>
+
 class CWallet;
 fs::path GetWalletDir();
 std::vector<fs::path> ListWalletDir();