miner: Make mempool optional for BlockAssembler

...also adjust callers

Changes:

- In BlockAssembler::CreateNewBlock, we now only lock m_mempool->cs and
  call addPackageTxs if m_mempool is not nullptr
- BlockAssembler::addPackageTxs now takes in a mempool reference, and is
  annotated to require that mempool's lock.
- In TestChain100Setup::CreateBlock and generateblock, don't construct
  an empty mempool, just pass in a nullptr for mempool

2 files changed, 2 insertions, 3 deletions

diff --git a/src/test/util/mining.cpp b/src/test/util/mining.cpp
index a6d624fe84..88cf9647e7 100644
--- a/src/test/util/mining.cpp
+++ b/src/test/util/mining.cpp
@@ -77,7 +77,7 @@ CTxIn MineBlock(const NodeContext& node, const CScript& coinbase_scriptPubKey)
 std::shared_ptr<CBlock> PrepareBlock(const NodeContext& node, const CScript& coinbase_scriptPubKey)
 {
     auto block = std::make_shared<CBlock>(
-        BlockAssembler{Assert(node.chainman)->ActiveChainstate(), *Assert(node.mempool)}
+        BlockAssembler{Assert(node.chainman)->ActiveChainstate(), Assert(node.mempool.get())}
             .CreateNewBlock(coinbase_scriptPubKey)
             ->block);
 
diff --git a/src/test/util/setup_common.cpp b/src/test/util/setup_common.cpp
index b7566bd1fa..67820d50bd 100644
--- a/src/test/util/setup_common.cpp
+++ b/src/test/util/setup_common.cpp
@@ -277,8 +277,7 @@ CBlock TestChain100Setup::CreateBlock(
     const CScript& scriptPubKey,
     CChainState& chainstate)
 {
-    CTxMemPool empty_pool;
-    CBlock block = BlockAssembler{chainstate, empty_pool}.CreateNewBlock(scriptPubKey)->block;
+    CBlock block = BlockAssembler{chainstate, nullptr}.CreateNewBlock(scriptPubKey)->block;
 
     Assert(block.vtx.size() == 1);
     for (const CMutableTransaction& tx : txns) {