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validation: make CChainState::m_mempool optional

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Since we now have multiple chainstate objects, only one of them is active at any given
time. An active chainstate has a mempool, but there's no point to others having one.

This change will simplify proposed assumeutxo semantics. See the discussion here:
https://github.com/bitcoin/bitcoin/pull/15606#pullrequestreview-692965905

Co-authored-by: Russell Yanofsky <russ@yanofsky.org>
This commit is contained in:
James O'Beirne
2021-07-06 17:05:25 -04:00
parent 088b348dbe
commit 617661703a
7 changed files with 64 additions and 40 deletions
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8
src/test/validation_chainstatemanager_tests.cpp
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@@ -36,7 +36,7 @@ BOOST_AUTO_TEST_CASE(chainstatemanager)
// Create a legacy (IBD) chainstate.
//
CChainState& c1 = WITH_LOCK(::cs_main, return manager.InitializeChainstate(mempool));
CChainState& c1 = WITH_LOCK(::cs_main, return manager.InitializeChainstate(&mempool));
chainstates.push_back(&c1);
c1.InitCoinsDB(
/* cache_size_bytes */ 1 << 23, /* in_memory */ true, /* should_wipe */ false);
@@ -66,7 +66,7 @@ BOOST_AUTO_TEST_CASE(chainstatemanager)
//
const uint256 snapshot_blockhash = GetRandHash();
CChainState& c2 = WITH_LOCK(::cs_main, return manager.InitializeChainstate(
mempool, snapshot_blockhash));
&mempool, snapshot_blockhash));
chainstates.push_back(&c2);
BOOST_CHECK_EQUAL(manager.SnapshotBlockhash().value(), snapshot_blockhash);
@@ -129,7 +129,7 @@ BOOST_AUTO_TEST_CASE(chainstatemanager_rebalance_caches)
// Create a legacy (IBD) chainstate.
//
CChainState& c1 = WITH_LOCK(cs_main, return manager.InitializeChainstate(mempool));
CChainState& c1 = WITH_LOCK(cs_main, return manager.InitializeChainstate(&mempool));
chainstates.push_back(&c1);
c1.InitCoinsDB(
/* cache_size_bytes */ 1 << 23, /* in_memory */ true, /* should_wipe */ false);
@@ -147,7 +147,7 @@ BOOST_AUTO_TEST_CASE(chainstatemanager_rebalance_caches)
// Create a snapshot-based chainstate.
//
CChainState& c2 = WITH_LOCK(cs_main, return manager.InitializeChainstate(mempool, GetRandHash()));
CChainState& c2 = WITH_LOCK(cs_main, return manager.InitializeChainstate(&mempool, GetRandHash()));
chainstates.push_back(&c2);
c2.InitCoinsDB(
/* cache_size_bytes */ 1 << 23, /* in_memory */ true, /* should_wipe */ false);