db: add StoragePath to CDBWrapper/CCoinsViewDB

This is used in subsequent commits. It allows us to clean up UTXO
snapshot chainstate after background validation completes.

src/dbwrapper.cpp

@@ -128,7 +128,7 @@ static leveldb::Options GetOptions(size_t nCacheSize)
 }
 
 CDBWrapper::CDBWrapper(const fs::path& path, size_t nCacheSize, bool fMemory, bool fWipe, bool obfuscate)
-    : m_name{fs::PathToString(path.stem())}
+    : m_name{fs::PathToString(path.stem())}, m_path{path}, m_is_memory{fMemory}
 {
     penv = nullptr;
     readoptions.verify_checksums = true;

src/dbwrapper.h

@@ -39,6 +39,10 @@ public:
 
 class CDBWrapper;
 
+namespace dbwrapper {
+    using leveldb::DestroyDB;
+}
+
 /** These should be considered an implementation detail of the specific database.
  */
 namespace dbwrapper_private {
@@ -219,6 +223,12 @@ private:
 
     std::vector<unsigned char> CreateObfuscateKey() const;
 
+    //! path to filesystem storage
+    const fs::path m_path;
+
+    //! whether or not the database resides in memory
+    bool m_is_memory;
+
 public:
     /**
      * @param[in] path        Location in the filesystem where leveldb data will be stored.
@@ -268,6 +278,14 @@ public:
         return WriteBatch(batch, fSync);
     }
 
+    //! @returns filesystem path to the on-disk data.
+    std::optional<fs::path> StoragePath() {
+        if (m_is_memory) {
+            return {};
+        }
+        return m_path;
+    }
+
     template <typename K>
     bool Exists(const K& key) const
     {

src/txdb.h

@@ -9,6 +9,7 @@
 #include <coins.h>
 #include <dbwrapper.h>
 #include <sync.h>
+#include <fs.h>
 
 #include <memory>
 #include <optional>
@@ -72,6 +73,9 @@ public:
 
     //! Dynamically alter the underlying leveldb cache size.
     void ResizeCache(size_t new_cache_size) EXCLUSIVE_LOCKS_REQUIRED(cs_main);
+
+    //! @returns filesystem path to on-disk storage or std::nullopt if in memory.
+    std::optional<fs::path> StoragePath() { return m_db->StoragePath(); }
 };
 
 /** Access to the block database (blocks/index/) */