index: Check availability of undo data for indices

src/index/base.h

@@ -122,9 +122,6 @@ protected:
 
     void ChainStateFlushed(const kernel::ChainstateRole& role, const CBlockLocator& locator) override;
 
-    /// Return custom notification options for index.
-    [[nodiscard]] virtual interfaces::Chain::NotifyOptions CustomOptions() { return {}; }
-
     /// Initialize internal state from the database and block index.
     [[nodiscard]] virtual bool CustomInit(const std::optional<interfaces::BlockRef>& block) { return true; }
 
@@ -151,6 +148,9 @@ public:
     /// Get the name of the index for display in logs.
     const std::string& GetName() const LIFETIMEBOUND { return m_name; }
 
+    /// Return custom notification options for index.
+    [[nodiscard]] virtual interfaces::Chain::NotifyOptions CustomOptions() { return {}; }
+
     /// Blocks the current thread until the index is caught up to the current
     /// state of the block chain. This only blocks if the index has gotten in
     /// sync once and only needs to process blocks in the ValidationInterface

src/index/blockfilterindex.h

@@ -63,8 +63,6 @@ private:
     std::optional<uint256> ReadFilterHeader(int height, const uint256& expected_block_hash);
 
 protected:
-    interfaces::Chain::NotifyOptions CustomOptions() override;
-
     bool CustomInit(const std::optional<interfaces::BlockRef>& block) override;
 
     bool CustomCommit(CDBBatch& batch) override;
@@ -80,6 +78,8 @@ public:
     explicit BlockFilterIndex(std::unique_ptr<interfaces::Chain> chain, BlockFilterType filter_type,
                               size_t n_cache_size, bool f_memory = false, bool f_wipe = false);
 
+    interfaces::Chain::NotifyOptions CustomOptions() override;
+
     BlockFilterType GetFilterType() const { return m_filter_type; }
 
     /** Get a single filter by block. */

src/index/coinstatsindex.h

@@ -52,8 +52,6 @@ private:
     bool AllowPrune() const override { return true; }
 
 protected:
-    interfaces::Chain::NotifyOptions CustomOptions() override;
-
     bool CustomInit(const std::optional<interfaces::BlockRef>& block) override;
 
     bool CustomCommit(CDBBatch& batch) override;
@@ -68,6 +66,8 @@ public:
     // Constructs the index, which becomes available to be queried.
     explicit CoinStatsIndex(std::unique_ptr<interfaces::Chain> chain, size_t n_cache_size, bool f_memory = false, bool f_wipe = false);
 
+    interfaces::Chain::NotifyOptions CustomOptions() override;
+
     // Look up stats for a specific block using CBlockIndex
     std::optional<kernel::CCoinsStats> LookUpStats(const CBlockIndex& block_index) const;
 };