refactoring: introduce CChainState::GetCoinsCacheSizeState

This separates out some logic for detecting how full the coins cache is from
FlushStateToDisk. We'll want to reuse this logic when deciding when to flush
the coins cache during UTXO snapshot activation.

1 files changed, 20 insertions, 0 deletions

diff --git a/src/validation.h b/src/validation.h
index 54f97e7213..81b2ccffc2 100644
--- a/src/validation.h
+++ b/src/validation.h
@@ -530,6 +530,15 @@ public:
     void InitCache() EXCLUSIVE_LOCKS_REQUIRED(::cs_main);
 };
 
+enum class CoinsCacheSizeState
+{
+    //! The coins cache is in immediate need of a flush.
+    CRITICAL = 2,
+    //! The cache is at >= 90% capacity.
+    LARGE = 1,
+    OK = 0
+};
+
 /**
  * CChainState stores and provides an API to update our local knowledge of the
  * current best chain.
@@ -721,6 +730,17 @@ public:
     /** Update the chain tip based on database information, i.e. CoinsTip()'s best block. */
     bool LoadChainTip(const CChainParams& chainparams) EXCLUSIVE_LOCKS_REQUIRED(cs_main);
 
+    //! Dictates whether we need to flush the cache to disk or not.
+    //!
+    //! @return the state of the size of the coins cache.
+    CoinsCacheSizeState GetCoinsCacheSizeState(const CTxMemPool& tx_pool)
+        EXCLUSIVE_LOCKS_REQUIRED(::cs_main);
+
+    CoinsCacheSizeState GetCoinsCacheSizeState(
+        const CTxMemPool& tx_pool,
+        size_t max_coins_cache_size_bytes,
+        size_t max_mempool_size_bytes) EXCLUSIVE_LOCKS_REQUIRED(::cs_main);
+
 private:
     bool ActivateBestChainStep(BlockValidationState& state, const CChainParams& chainparams, CBlockIndex* pindexMostWork, const std::shared_ptr<const CBlock>& pblock, bool& fInvalidFound, ConnectTrace& connectTrace) EXCLUSIVE_LOCKS_REQUIRED(cs_main, ::mempool.cs);
     bool ConnectTip(BlockValidationState& state, const CChainParams& chainparams, CBlockIndex* pindexNew, const std::shared_ptr<const CBlock>& pblock, ConnectTrace& connectTrace, DisconnectedBlockTransactions& disconnectpool) EXCLUSIVE_LOCKS_REQUIRED(cs_main, ::mempool.cs);