Merge bitcoin/bitcoin#23280: init: Coalesce Chainstate loading sequence between {,non-}unittest codepaths

7f15eff2dd style-only: Remove redundant scope in *Chainstate (Carl Dong)
89bec827fd Collapse the 2 cs_main locks in LoadChainstate (Carl Dong)
3b1584b794 Remove all #include // for * comments (Carl Dong)
9a5a5a3d08 test/setup: Use LoadChainstate (Carl Dong)
c541da0d62 node/chainstate: Add options for in-memory DBs (Carl Dong)
ceb9790341 node/caches: Remove intermediate variables (Carl Dong)
ac4bf138b8 node/caches: Extract cache calculation logic (Carl Dong)
15f2e33bb3 validation: VerifyDB only needs Consensus::Params (Carl Dong)
4da9c076d1 node/chainstate: Decouple from ShutdownRequested (Carl Dong)
05441c2dc5 node/chainstate: Decouple from GetTime (Carl Dong)
2414ebc18b init: Delay RPC block notif until warmup finished (Carl Dong)
8d466a8504 Move -checkblocks LogPrintf to AppInitMain (Carl Dong)
aad8d59789 node/chainstate: Reduce coupling of LogPrintf (Carl Dong)
b345979a2b node/chainstate: Decouple from concept of uiInterface (Carl Dong)
ca7c0b934d Split off VerifyLoadedChainstate (Carl Dong)
adf4912d77 node/chainstate: Remove do/while loop (Carl Dong)
975235ca0a Move init logistics message for BAD_GENESIS_BLOCK to init.cpp (Carl Dong)
8715658983 Move mempool nullptr Assert out of LoadChainstate (Carl Dong)
9162a4f93e node/chainstate: Decouple from concept of NodeContext (Carl Dong)
c7a5c46e6f node/chainstate: Decouple from ArgsManager (Carl Dong)
ae9121f958 node/chainstate: Decouple from stringy errors (Carl Dong)
cbac28b72f node/chainstate: Decouple from GetTimeMillis (Carl Dong)
cb64af9635 node: Extract chainstate loading sequence (Carl Dong)

Pull request description:

  This PR:
  1. Coalesce the Chainstate loading sequence between `AppInitMain` and `*TestingSetup` (which makes it more tested)
  2. Makes the Chainstate loading sequence reusable in preparation for future work extracting out our consensus engine.

  Code-wise, this PR:
  1. Extracts `AppInitMain`'s Chainstate loading sequence into a `::LoadChainstateSequence` function
  2. Makes this `::LoadChainstateSequence` function reusable by
      1. Decoupling it from various concepts (`ArgsManager`, `uiInterface`, etc)
      2. Making it report errors using an `enum` rather than by setting a `bilingual_str`
  3. Makes `*TestingSetup` use this new `::LoadChainstateSequence`

  Reviewers: Aside from commentary, I've also included `git diff` flags of interest in the commit messages which I hope will aid review!

ACKs for top commit:
  ryanofsky:
    Code review ACK 7f15eff2dd. Thanks for updates!
  MarcoFalke:
    review ACK 7f15eff2dd 💳

Tree-SHA512: fb9a6cbd1c511a52b477c62a5e68e53a8be5dec2fff0e44a279966afb91efbab44bf1fe7c6b1519f8464ecc25f42dd4bae8e1efbf55ee91fc90fa0b92e3a83e2

src/test/util/setup_common.cpp

@@ -17,6 +17,8 @@
 #include <net_processing.h>
 #include <node/miner.h>
 #include <noui.h>
+#include <node/blockstorage.h>
+#include <node/chainstate.h>
 #include <policy/fees.h>
 #include <pow.h>
 #include <rpc/blockchain.h>
@@ -24,6 +26,7 @@
 #include <rpc/server.h>
 #include <scheduler.h>
 #include <script/sigcache.h>
+#include <shutdown.h>
 #include <streams.h>
 #include <txdb.h>
 #include <util/strencodings.h>
@@ -143,8 +146,10 @@ ChainTestingSetup::ChainTestingSetup(const std::string& chainName, const std::ve
     m_node.fee_estimator = std::make_unique<CBlockPolicyEstimator>();
     m_node.mempool = std::make_unique<CTxMemPool>(m_node.fee_estimator.get(), 1);
 
+    m_cache_sizes = CalculateCacheSizes(m_args);
+
     m_node.chainman = std::make_unique<ChainstateManager>();
-    m_node.chainman->m_blockman.m_block_tree_db = std::make_unique<CBlockTreeDB>(1 << 20, true);
+    m_node.chainman->m_blockman.m_block_tree_db = std::make_unique<CBlockTreeDB>(m_cache_sizes.block_tree_db, true);
 
     // Start script-checking threads. Set g_parallel_script_checks to true so they are used.
     constexpr int script_check_threads = 2;
@@ -177,15 +182,18 @@ TestingSetup::TestingSetup(const std::string& chainName, const std::vector<const
     // instead of unit tests, but for now we need these here.
     RegisterAllCoreRPCCommands(tableRPC);
 
-    m_node.chainman->InitializeChainstate(m_node.mempool.get());
-    m_node.chainman->ActiveChainstate().InitCoinsDB(
-        /*cache_size_bytes=*/1 << 23, /*in_memory=*/true, /*should_wipe=*/false);
-    assert(!m_node.chainman->ActiveChainstate().CanFlushToDisk());
-    m_node.chainman->ActiveChainstate().InitCoinsCache(1 << 23);
-    assert(m_node.chainman->ActiveChainstate().CanFlushToDisk());
-    if (!m_node.chainman->ActiveChainstate().LoadGenesisBlock()) {
-        throw std::runtime_error("LoadGenesisBlock failed.");
-    }
+    auto rv = LoadChainstate(fReindex.load(),
+                             *Assert(m_node.chainman.get()),
+                             Assert(m_node.mempool.get()),
+                             fPruneMode,
+                             chainparams.GetConsensus(),
+                             m_args.GetBoolArg("-reindex-chainstate", false),
+                             m_cache_sizes.block_tree_db,
+                             m_cache_sizes.coins_db,
+                             m_cache_sizes.coins,
+                             true,
+                             true);
+    assert(!rv.has_value());
 
     BlockValidationState state;
     if (!m_node.chainman->ActiveChainstate().ActivateBestChain(state)) {

src/test/util/setup_common.h

@@ -9,6 +9,7 @@
 #include <fs.h>
 #include <key.h>
 #include <util/system.h>
+#include <node/caches.h>
 #include <node/context.h>
 #include <pubkey.h>
 #include <random.h>
@@ -89,6 +90,7 @@ struct BasicTestingSetup {
  * initialization behaviour.
  */
 struct ChainTestingSetup : public BasicTestingSetup {
+    CacheSizes m_cache_sizes{};
 
     explicit ChainTestingSetup(const std::string& chainName = CBaseChainParams::MAIN, const std::vector<const char*>& extra_args = {});
     ~ChainTestingSetup();