refactor: Move CDBWrapper leveldb members to their own context struct

The context of this commit is an effort to decouple the dbwrapper header
file from leveldb includes. To this end, the includes are moved to the
dbwrapper implementation file. This is done as part of the kernel
project to reduce the number of required includes for users of the
kernel.

1 files changed, 7 insertions, 25 deletions

diff --git a/src/dbwrapper.h b/src/dbwrapper.h
index fa7b6397cb..66170b5efa 100644
--- a/src/dbwrapper.h
+++ b/src/dbwrapper.h
@@ -5,24 +5,21 @@
 #ifndef BITCOIN_DBWRAPPER_H
 #define BITCOIN_DBWRAPPER_H
 
+#include <attributes.h>
 #include <clientversion.h>
 #include <serialize.h>
 #include <span.h>
 #include <streams.h>
+#include <util/check.h>
 #include <util/fs.h>
 
 #include <cstddef>
 #include <exception>
-#include <leveldb/options.h>
 #include <memory>
 #include <optional>
 #include <stdexcept>
 #include <string>
 #include <vector>
-namespace leveldb {
-class DB;
-class Env;
-}
 
 static const size_t DBWRAPPER_PREALLOC_KEY_SIZE = 64;
 static const size_t DBWRAPPER_PREALLOC_VALUE_SIZE = 1024;
@@ -180,30 +177,14 @@ public:
     }
 };
 
+struct LevelDBContext;
+
 class CDBWrapper
 {
     friend const std::vector<unsigned char>& dbwrapper_private::GetObfuscateKey(const CDBWrapper &w);
 private:
-    //! custom environment this database is using (may be nullptr in case of default environment)
-    leveldb::Env* penv;
-
-    //! database options used
-    leveldb::Options options;
-
-    //! options used when reading from the database
-    leveldb::ReadOptions readoptions;
-
-    //! options used when iterating over values of the database
-    leveldb::ReadOptions iteroptions;
-
-    //! options used when writing to the database
-    leveldb::WriteOptions writeoptions;
-
-    //! options used when sync writing to the database
-    leveldb::WriteOptions syncoptions;
-
-    //! the database itself
-    leveldb::DB* pdb;
+    //! holds all leveldb-specific fields of this class
+    std::unique_ptr<LevelDBContext> m_db_context;
 
     //! the name of this database
     std::string m_name;
@@ -228,6 +209,7 @@ private:
     std::optional<std::string> ReadImpl(Span<const std::byte> ssKey) const;
     bool ExistsImpl(Span<const std::byte> ssKey) const;
     size_t EstimateSizeImpl(Span<const std::byte> ssKey1, Span<const std::byte> ssKey2) const;
+    auto& DBContext() const LIFETIMEBOUND { return *Assert(m_db_context); }
 
 public:
     CDBWrapper(const DBParams& params);