Add MakeBerkeleyRODatabase

Implements MakeBerkeleyRODatabase and adds DatabaseFormat::BERKELEY_RO
so that MakeDatabase can use BerkeleyRO as the backend database.

src/wallet/db.h

@@ -183,6 +183,7 @@ public:
 enum class DatabaseFormat {
     BERKELEY,
     SQLITE,
+    BERKELEY_RO,
 };
 
 struct DatabaseOptions {

src/wallet/migrate.cpp

@@ -5,6 +5,7 @@
 #include <crypto/common.h> // For ReadBE32
 #include <logging.h>
 #include <streams.h>
+#include <util/translation.h>
 #include <wallet/migrate.h>
 
 #include <optional>
@@ -748,4 +749,18 @@ std::unique_ptr<DatabaseCursor> BerkeleyROBatch::GetNewPrefixCursor(Span<const s
 {
     return std::make_unique<BerkeleyROCursor>(m_database, prefix);
 }
+
+std::unique_ptr<BerkeleyRODatabase> MakeBerkeleyRODatabase(const fs::path& path, const DatabaseOptions& options, DatabaseStatus& status, bilingual_str& error)
+{
+    fs::path data_file = BDBDataFile(path);
+    try {
+        std::unique_ptr<BerkeleyRODatabase> db = std::make_unique<BerkeleyRODatabase>(data_file);
+        status = DatabaseStatus::SUCCESS;
+        return db;
+    } catch (const std::runtime_error& e) {
+        error.original = e.what();
+        status = DatabaseStatus::FAILED_LOAD;
+        return nullptr;
+    }
+}
 } // namespace wallet

src/wallet/migrate.h

@@ -116,6 +116,9 @@ public:
     bool TxnCommit() override { return false; }
     bool TxnAbort() override { return false; }
 };
+
+//! Return object giving access to Berkeley Read Only database at specified path.
+std::unique_ptr<BerkeleyRODatabase> MakeBerkeleyRODatabase(const fs::path& path, const DatabaseOptions& options, DatabaseStatus& status, bilingual_str& error);
 } // namespace wallet
 
 #endif // BITCOIN_WALLET_MIGRATE_H

src/wallet/walletdb.cpp

@@ -23,6 +23,7 @@
 #ifdef USE_BDB
 #include <wallet/bdb.h>
 #endif
+#include <wallet/migrate.h>
 #ifdef USE_SQLITE
 #include <wallet/sqlite.h>
 #endif
@@ -1389,6 +1390,11 @@ std::unique_ptr<WalletDatabase> MakeDatabase(const fs::path& path, const Databas
         return nullptr;
     }
 
+    // If BERKELEY was the format, then change the format from BERKELEY to BERKELEY_RO
+    if (format && options.require_format && format == DatabaseFormat::BERKELEY && options.require_format == DatabaseFormat::BERKELEY_RO) {
+        format = DatabaseFormat::BERKELEY_RO;
+    }
+
     // A db already exists so format is set, but options also specifies the format, so make sure they agree
     if (format && options.require_format && format != options.require_format) {
         error = Untranslated(strprintf("Failed to load database path '%s'. Data is not in required format.", fs::PathToString(path)));
@@ -1422,6 +1428,10 @@ std::unique_ptr<WalletDatabase> MakeDatabase(const fs::path& path, const Databas
         }
     }
 
+    if (format == DatabaseFormat::BERKELEY_RO) {
+        return MakeBerkeleyRODatabase(path, options, status, error);
+    }
+
 #ifdef USE_BDB
     if constexpr (true) {
         return MakeBerkeleyDatabase(path, options, status, error);