Merge #19310: wallet: BerkeleyDatabase make BerkeleyDatabase::Create, CreateMock, and CreateDummy non-static functions

da7a83c5ee6a51ff4c3eb35dbd447a310c4a0387 Remove WalletDatabase::Create, CreateMock, and CreateDummy (Andrew Chow)
d6045d0ac615b5984b72e83cb25aa8a245a177a0 scripted-diff: Replace WalletDatabase::Create* with CreateWalletDatabase (Andrew Chow)
45c08f8a7b89dda6afb7d7cf9573a8ae8290ac92 Add Create*WalletDatabase functions (Andrew Chow)

Pull request description:

  Instead of having `Create`, `CreateMock`, and `CreateDummy` being static functions in `BerkeleyDatabase`, move these to standalone functions in `walletdb.cpp`. This prepares us for having different `WalletDatabase` classes.

  Part of #18971. This was originally one commit but has been split into 3 to make it (hopefully) easier to review.

ACKs for top commit:
  MarcoFalke:
    ACK da7a83c5ee6a51ff4c3eb35dbd447a310c4a0387 🎂
  ryanofsky:
    Code review ACK da7a83c5ee6a51ff4c3eb35dbd447a310c4a0387. Easy review, nice scripted-diff

Tree-SHA512: 1feb7cb3889168c555154bf3701a49095fd6b8cab911d44b7f7efbf6fcee2280ccb3d4afec8a83755b39a592ecd13b90a318faa655c321f87bdabdf1e2312327

11 files changed, 69 insertions, 60 deletions

diff --git a/src/wallet/bdb.h b/src/wallet/bdb.h
index 1e717b95be..c121bb4228 100644
--- a/src/wallet/bdb.h
+++ b/src/wallet/bdb.h
@@ -120,25 +120,6 @@ public:
         }
     }
 
-    /** Return object for accessing database at specified path. */
-    static std::unique_ptr<BerkeleyDatabase> Create(const fs::path& path)
-    {
-        std::string filename;
-        return MakeUnique<BerkeleyDatabase>(GetWalletEnv(path, filename), std::move(filename));
-    }
-
-    /** Return object for accessing dummy database with no read/write capabilities. */
-    static std::unique_ptr<BerkeleyDatabase> CreateDummy()
-    {
-        return MakeUnique<BerkeleyDatabase>();
-    }
-
-    /** Return object for accessing temporary in-memory database. */
-    static std::unique_ptr<BerkeleyDatabase> CreateMock()
-    {
-        return MakeUnique<BerkeleyDatabase>(std::make_shared<BerkeleyEnvironment>(), "");
-    }
-
     /** Rewrite the entire database on disk, with the exception of key pszSkip if non-zero
      */
     bool Rewrite(const char* pszSkip=nullptr);
diff --git a/src/wallet/salvage.cpp b/src/wallet/salvage.cpp
index 70067ebef0..d42950ee42 100644
--- a/src/wallet/salvage.cpp
+++ b/src/wallet/salvage.cpp
@@ -116,7 +116,7 @@ bool RecoverDatabaseFile(const fs::path& file_path)
     }
 
     DbTxn* ptxn = env->TxnBegin();
-    CWallet dummyWallet(nullptr, WalletLocation(), WalletDatabase::CreateDummy());
+    CWallet dummyWallet(nullptr, WalletLocation(), CreateDummyWalletDatabase());
     for (KeyValPair& row : salvagedData)
     {
         /* Filter for only private key type KV pairs to be added to the salvaged wallet */
diff --git a/src/wallet/test/coinselector_tests.cpp b/src/wallet/test/coinselector_tests.cpp
index 657d0828f2..1deedede4c 100644
--- a/src/wallet/test/coinselector_tests.cpp
+++ b/src/wallet/test/coinselector_tests.cpp
@@ -29,7 +29,7 @@ typedef std::set<CInputCoin> CoinSet;
 static std::vector<COutput> vCoins;
 static NodeContext testNode;
 static auto testChain = interfaces::MakeChain(testNode);
-static CWallet testWallet(testChain.get(), WalletLocation(), WalletDatabase::CreateDummy());
+static CWallet testWallet(testChain.get(), WalletLocation(), CreateDummyWalletDatabase());
 static CAmount balance = 0;
 
 CoinEligibilityFilter filter_standard(1, 6, 0);
@@ -283,7 +283,7 @@ BOOST_AUTO_TEST_CASE(bnb_search_test)
     // Make sure that can use BnB when there are preset inputs
     empty_wallet();
     {
-        std::unique_ptr<CWallet> wallet = MakeUnique<CWallet>(m_chain.get(), WalletLocation(), WalletDatabase::CreateMock());
+        std::unique_ptr<CWallet> wallet = MakeUnique<CWallet>(m_chain.get(), WalletLocation(), CreateMockWalletDatabase());
         bool firstRun;
         wallet->LoadWallet(firstRun);
         wallet->SetupLegacyScriptPubKeyMan();
diff --git a/src/wallet/test/ismine_tests.cpp b/src/wallet/test/ismine_tests.cpp
index 4c0e4dc653..cdb0522920 100644
--- a/src/wallet/test/ismine_tests.cpp
+++ b/src/wallet/test/ismine_tests.cpp
@@ -35,7 +35,7 @@ BOOST_AUTO_TEST_CASE(ismine_standard)
 
     // P2PK compressed
     {
-        CWallet keystore(chain.get(), WalletLocation(), WalletDatabase::CreateDummy());
+        CWallet keystore(chain.get(), WalletLocation(), CreateDummyWalletDatabase());
         keystore.SetupLegacyScriptPubKeyMan();
         LOCK(keystore.GetLegacyScriptPubKeyMan()->cs_KeyStore);
         scriptPubKey = GetScriptForRawPubKey(pubkeys[0]);
@@ -52,7 +52,7 @@ BOOST_AUTO_TEST_CASE(ismine_standard)
 
     // P2PK uncompressed
     {
-        CWallet keystore(chain.get(), WalletLocation(), WalletDatabase::CreateDummy());
+        CWallet keystore(chain.get(), WalletLocation(), CreateDummyWalletDatabase());
         keystore.SetupLegacyScriptPubKeyMan();
         LOCK(keystore.GetLegacyScriptPubKeyMan()->cs_KeyStore);
         scriptPubKey = GetScriptForRawPubKey(uncompressedPubkey);
@@ -69,7 +69,7 @@ BOOST_AUTO_TEST_CASE(ismine_standard)
 
     // P2PKH compressed
     {
-        CWallet keystore(chain.get(), WalletLocation(), WalletDatabase::CreateDummy());
+        CWallet keystore(chain.get(), WalletLocation(), CreateDummyWalletDatabase());
         keystore.SetupLegacyScriptPubKeyMan();
         LOCK(keystore.GetLegacyScriptPubKeyMan()->cs_KeyStore);
         scriptPubKey = GetScriptForDestination(PKHash(pubkeys[0]));
@@ -86,7 +86,7 @@ BOOST_AUTO_TEST_CASE(ismine_standard)
 
     // P2PKH uncompressed
     {
-        CWallet keystore(chain.get(), WalletLocation(), WalletDatabase::CreateDummy());
+        CWallet keystore(chain.get(), WalletLocation(), CreateDummyWalletDatabase());
         keystore.SetupLegacyScriptPubKeyMan();
         LOCK(keystore.GetLegacyScriptPubKeyMan()->cs_KeyStore);
         scriptPubKey = GetScriptForDestination(PKHash(uncompressedPubkey));
@@ -103,7 +103,7 @@ BOOST_AUTO_TEST_CASE(ismine_standard)
 
     // P2SH
     {
-        CWallet keystore(chain.get(), WalletLocation(), WalletDatabase::CreateDummy());
+        CWallet keystore(chain.get(), WalletLocation(), CreateDummyWalletDatabase());
         keystore.SetupLegacyScriptPubKeyMan();
         LOCK(keystore.GetLegacyScriptPubKeyMan()->cs_KeyStore);
 
@@ -127,7 +127,7 @@ BOOST_AUTO_TEST_CASE(ismine_standard)
 
     // (P2PKH inside) P2SH inside P2SH (invalid)
     {
-        CWallet keystore(chain.get(), WalletLocation(), WalletDatabase::CreateDummy());
+        CWallet keystore(chain.get(), WalletLocation(), CreateDummyWalletDatabase());
         keystore.SetupLegacyScriptPubKeyMan();
         LOCK(keystore.GetLegacyScriptPubKeyMan()->cs_KeyStore);
 
@@ -145,7 +145,7 @@ BOOST_AUTO_TEST_CASE(ismine_standard)
 
     // (P2PKH inside) P2SH inside P2WSH (invalid)
     {
-        CWallet keystore(chain.get(), WalletLocation(), WalletDatabase::CreateDummy());
+        CWallet keystore(chain.get(), WalletLocation(), CreateDummyWalletDatabase());
         keystore.SetupLegacyScriptPubKeyMan();
         LOCK(keystore.GetLegacyScriptPubKeyMan()->cs_KeyStore);
 
@@ -163,7 +163,7 @@ BOOST_AUTO_TEST_CASE(ismine_standard)
 
     // P2WPKH inside P2WSH (invalid)
     {
-        CWallet keystore(chain.get(), WalletLocation(), WalletDatabase::CreateDummy());
+        CWallet keystore(chain.get(), WalletLocation(), CreateDummyWalletDatabase());
         keystore.SetupLegacyScriptPubKeyMan();
         LOCK(keystore.GetLegacyScriptPubKeyMan()->cs_KeyStore);
 
@@ -179,7 +179,7 @@ BOOST_AUTO_TEST_CASE(ismine_standard)
 
     // (P2PKH inside) P2WSH inside P2WSH (invalid)
     {
-        CWallet keystore(chain.get(), WalletLocation(), WalletDatabase::CreateDummy());
+        CWallet keystore(chain.get(), WalletLocation(), CreateDummyWalletDatabase());
         keystore.SetupLegacyScriptPubKeyMan();
         LOCK(keystore.GetLegacyScriptPubKeyMan()->cs_KeyStore);
 
@@ -197,7 +197,7 @@ BOOST_AUTO_TEST_CASE(ismine_standard)
 
     // P2WPKH compressed
     {
-        CWallet keystore(chain.get(), WalletLocation(), WalletDatabase::CreateDummy());
+        CWallet keystore(chain.get(), WalletLocation(), CreateDummyWalletDatabase());
         keystore.SetupLegacyScriptPubKeyMan();
         LOCK(keystore.GetLegacyScriptPubKeyMan()->cs_KeyStore);
         BOOST_CHECK(keystore.GetLegacyScriptPubKeyMan()->AddKey(keys[0]));
@@ -212,7 +212,7 @@ BOOST_AUTO_TEST_CASE(ismine_standard)
 
     // P2WPKH uncompressed
     {
-        CWallet keystore(chain.get(), WalletLocation(), WalletDatabase::CreateDummy());
+        CWallet keystore(chain.get(), WalletLocation(), CreateDummyWalletDatabase());
         keystore.SetupLegacyScriptPubKeyMan();
         LOCK(keystore.GetLegacyScriptPubKeyMan()->cs_KeyStore);
         BOOST_CHECK(keystore.GetLegacyScriptPubKeyMan()->AddKey(uncompressedKey));
@@ -231,7 +231,7 @@ BOOST_AUTO_TEST_CASE(ismine_standard)
 
     // scriptPubKey multisig
     {
-        CWallet keystore(chain.get(), WalletLocation(), WalletDatabase::CreateDummy());
+        CWallet keystore(chain.get(), WalletLocation(), CreateDummyWalletDatabase());
         keystore.SetupLegacyScriptPubKeyMan();
         LOCK(keystore.GetLegacyScriptPubKeyMan()->cs_KeyStore);
 
@@ -262,7 +262,7 @@ BOOST_AUTO_TEST_CASE(ismine_standard)
 
     // P2SH multisig
     {
-        CWallet keystore(chain.get(), WalletLocation(), WalletDatabase::CreateDummy());
+        CWallet keystore(chain.get(), WalletLocation(), CreateDummyWalletDatabase());
         keystore.SetupLegacyScriptPubKeyMan();
         LOCK(keystore.GetLegacyScriptPubKeyMan()->cs_KeyStore);
         BOOST_CHECK(keystore.GetLegacyScriptPubKeyMan()->AddKey(uncompressedKey));
@@ -283,7 +283,7 @@ BOOST_AUTO_TEST_CASE(ismine_standard)
 
     // P2WSH multisig with compressed keys
     {
-        CWallet keystore(chain.get(), WalletLocation(), WalletDatabase::CreateDummy());
+        CWallet keystore(chain.get(), WalletLocation(), CreateDummyWalletDatabase());
         keystore.SetupLegacyScriptPubKeyMan();
         LOCK(keystore.GetLegacyScriptPubKeyMan()->cs_KeyStore);
         BOOST_CHECK(keystore.GetLegacyScriptPubKeyMan()->AddKey(keys[0]));
@@ -309,7 +309,7 @@ BOOST_AUTO_TEST_CASE(ismine_standard)
 
     // P2WSH multisig with uncompressed key
     {
-        CWallet keystore(chain.get(), WalletLocation(), WalletDatabase::CreateDummy());
+        CWallet keystore(chain.get(), WalletLocation(), CreateDummyWalletDatabase());
         keystore.SetupLegacyScriptPubKeyMan();
         LOCK(keystore.GetLegacyScriptPubKeyMan()->cs_KeyStore);
         BOOST_CHECK(keystore.GetLegacyScriptPubKeyMan()->AddKey(uncompressedKey));
@@ -335,7 +335,7 @@ BOOST_AUTO_TEST_CASE(ismine_standard)
 
     // P2WSH multisig wrapped in P2SH
     {
-        CWallet keystore(chain.get(), WalletLocation(), WalletDatabase::CreateDummy());
+        CWallet keystore(chain.get(), WalletLocation(), CreateDummyWalletDatabase());
         keystore.SetupLegacyScriptPubKeyMan();
         LOCK(keystore.GetLegacyScriptPubKeyMan()->cs_KeyStore);
 
@@ -362,7 +362,7 @@ BOOST_AUTO_TEST_CASE(ismine_standard)
 
     // OP_RETURN
     {
-        CWallet keystore(chain.get(), WalletLocation(), WalletDatabase::CreateDummy());
+        CWallet keystore(chain.get(), WalletLocation(), CreateDummyWalletDatabase());
         keystore.SetupLegacyScriptPubKeyMan();
         LOCK(keystore.GetLegacyScriptPubKeyMan()->cs_KeyStore);
         BOOST_CHECK(keystore.GetLegacyScriptPubKeyMan()->AddKey(keys[0]));
@@ -376,7 +376,7 @@ BOOST_AUTO_TEST_CASE(ismine_standard)
 
     // witness unspendable
     {
-        CWallet keystore(chain.get(), WalletLocation(), WalletDatabase::CreateDummy());
+        CWallet keystore(chain.get(), WalletLocation(), CreateDummyWalletDatabase());
         keystore.SetupLegacyScriptPubKeyMan();
         LOCK(keystore.GetLegacyScriptPubKeyMan()->cs_KeyStore);
         BOOST_CHECK(keystore.GetLegacyScriptPubKeyMan()->AddKey(keys[0]));
@@ -390,7 +390,7 @@ BOOST_AUTO_TEST_CASE(ismine_standard)
 
     // witness unknown
     {
-        CWallet keystore(chain.get(), WalletLocation(), WalletDatabase::CreateDummy());
+        CWallet keystore(chain.get(), WalletLocation(), CreateDummyWalletDatabase());
         keystore.SetupLegacyScriptPubKeyMan();
         LOCK(keystore.GetLegacyScriptPubKeyMan()->cs_KeyStore);
         BOOST_CHECK(keystore.GetLegacyScriptPubKeyMan()->AddKey(keys[0]));
@@ -404,7 +404,7 @@ BOOST_AUTO_TEST_CASE(ismine_standard)
 
     // Nonstandard
     {
-        CWallet keystore(chain.get(), WalletLocation(), WalletDatabase::CreateDummy());
+        CWallet keystore(chain.get(), WalletLocation(), CreateDummyWalletDatabase());
         keystore.SetupLegacyScriptPubKeyMan();
         LOCK(keystore.GetLegacyScriptPubKeyMan()->cs_KeyStore);
         BOOST_CHECK(keystore.GetLegacyScriptPubKeyMan()->AddKey(keys[0]));
diff --git a/src/wallet/test/scriptpubkeyman_tests.cpp b/src/wallet/test/scriptpubkeyman_tests.cpp
index 757865ea37..4f12079768 100644
--- a/src/wallet/test/scriptpubkeyman_tests.cpp
+++ b/src/wallet/test/scriptpubkeyman_tests.cpp
@@ -19,7 +19,7 @@ BOOST_AUTO_TEST_CASE(CanProvide)
     // Set up wallet and keyman variables.
     NodeContext node;
     std::unique_ptr<interfaces::Chain> chain = interfaces::MakeChain(node);
-    CWallet wallet(chain.get(), WalletLocation(), WalletDatabase::CreateDummy());
+    CWallet wallet(chain.get(), WalletLocation(), CreateDummyWalletDatabase());
     LegacyScriptPubKeyMan& keyman = *wallet.GetOrCreateLegacyScriptPubKeyMan();
 
     // Make a 1 of 2 multisig script
diff --git a/src/wallet/test/wallet_test_fixture.cpp b/src/wallet/test/wallet_test_fixture.cpp
index 7ba3148ff3..44f9eb5ddd 100644
--- a/src/wallet/test/wallet_test_fixture.cpp
+++ b/src/wallet/test/wallet_test_fixture.cpp
@@ -6,7 +6,7 @@
 
 WalletTestingSetup::WalletTestingSetup(const std::string& chainName)
     : TestingSetup(chainName),
-      m_wallet(m_chain.get(), WalletLocation(), WalletDatabase::CreateMock())
+      m_wallet(m_chain.get(), WalletLocation(), CreateMockWalletDatabase())
 {
     bool fFirstRun;
     m_wallet.LoadWallet(fFirstRun);
diff --git a/src/wallet/test/wallet_tests.cpp b/src/wallet/test/wallet_tests.cpp
index 6f8c973f25..497ccd14bb 100644
--- a/src/wallet/test/wallet_tests.cpp
+++ b/src/wallet/test/wallet_tests.cpp
@@ -80,7 +80,7 @@ BOOST_FIXTURE_TEST_CASE(scan_for_wallet_transactions, TestChain100Setup)
 
     // Verify ScanForWalletTransactions fails to read an unknown start block.
     {
-        CWallet wallet(chain.get(), WalletLocation(), WalletDatabase::CreateDummy());
+        CWallet wallet(chain.get(), WalletLocation(), CreateDummyWalletDatabase());
         {
             LOCK(wallet.cs_wallet);
             wallet.SetLastBlockProcessed(::ChainActive().Height(), ::ChainActive().Tip()->GetBlockHash());
@@ -99,7 +99,7 @@ BOOST_FIXTURE_TEST_CASE(scan_for_wallet_transactions, TestChain100Setup)
     // Verify ScanForWalletTransactions picks up transactions in both the old
     // and new block files.
     {
-        CWallet wallet(chain.get(), WalletLocation(), WalletDatabase::CreateDummy());
+        CWallet wallet(chain.get(), WalletLocation(), CreateDummyWalletDatabase());
         {
             LOCK(wallet.cs_wallet);
             wallet.SetLastBlockProcessed(::ChainActive().Height(), ::ChainActive().Tip()->GetBlockHash());
@@ -125,7 +125,7 @@ BOOST_FIXTURE_TEST_CASE(scan_for_wallet_transactions, TestChain100Setup)
     // Verify ScanForWalletTransactions only picks transactions in the new block
     // file.
     {
-        CWallet wallet(chain.get(), WalletLocation(), WalletDatabase::CreateDummy());
+        CWallet wallet(chain.get(), WalletLocation(), CreateDummyWalletDatabase());
         {
             LOCK(wallet.cs_wallet);
             wallet.SetLastBlockProcessed(::ChainActive().Height(), ::ChainActive().Tip()->GetBlockHash());
@@ -150,7 +150,7 @@ BOOST_FIXTURE_TEST_CASE(scan_for_wallet_transactions, TestChain100Setup)
 
     // Verify ScanForWalletTransactions scans no blocks.
     {
-        CWallet wallet(chain.get(), WalletLocation(), WalletDatabase::CreateDummy());
+        CWallet wallet(chain.get(), WalletLocation(), CreateDummyWalletDatabase());
         {
             LOCK(wallet.cs_wallet);
             wallet.SetLastBlockProcessed(::ChainActive().Height(), ::ChainActive().Tip()->GetBlockHash());
@@ -189,7 +189,7 @@ BOOST_FIXTURE_TEST_CASE(importmulti_rescan, TestChain100Setup)
     // before the missing block, and success for a key whose creation time is
     // after.
     {
-        std::shared_ptr<CWallet> wallet = std::make_shared<CWallet>(chain.get(), WalletLocation(), WalletDatabase::CreateDummy());
+        std::shared_ptr<CWallet> wallet = std::make_shared<CWallet>(chain.get(), WalletLocation(), CreateDummyWalletDatabase());
         wallet->SetupLegacyScriptPubKeyMan();
         WITH_LOCK(wallet->cs_wallet, wallet->SetLastBlockProcessed(newTip->nHeight, newTip->GetBlockHash()));
         AddWallet(wallet);
@@ -254,7 +254,7 @@ BOOST_FIXTURE_TEST_CASE(importwallet_rescan, TestChain100Setup)
 
     // Import key into wallet and call dumpwallet to create backup file.
     {
-        std::shared_ptr<CWallet> wallet = std::make_shared<CWallet>(chain.get(), WalletLocation(), WalletDatabase::CreateDummy());
+        std::shared_ptr<CWallet> wallet = std::make_shared<CWallet>(chain.get(), WalletLocation(), CreateDummyWalletDatabase());
         {
             auto spk_man = wallet->GetOrCreateLegacyScriptPubKeyMan();
             LOCK2(wallet->cs_wallet, spk_man->cs_KeyStore);
@@ -276,7 +276,7 @@ BOOST_FIXTURE_TEST_CASE(importwallet_rescan, TestChain100Setup)
     // Call importwallet RPC and verify all blocks with timestamps >= BLOCK_TIME
     // were scanned, and no prior blocks were scanned.
     {
-        std::shared_ptr<CWallet> wallet = std::make_shared<CWallet>(chain.get(), WalletLocation(), WalletDatabase::CreateDummy());
+        std::shared_ptr<CWallet> wallet = std::make_shared<CWallet>(chain.get(), WalletLocation(), CreateDummyWalletDatabase());
         LOCK(wallet->cs_wallet);
         wallet->SetupLegacyScriptPubKeyMan();
 
@@ -312,7 +312,7 @@ BOOST_FIXTURE_TEST_CASE(coin_mark_dirty_immature_credit, TestChain100Setup)
     NodeContext node;
     auto chain = interfaces::MakeChain(node);
 
-    CWallet wallet(chain.get(), WalletLocation(), WalletDatabase::CreateDummy());
+    CWallet wallet(chain.get(), WalletLocation(), CreateDummyWalletDatabase());
     auto spk_man = wallet.GetOrCreateLegacyScriptPubKeyMan();
     CWalletTx wtx(&wallet, m_coinbase_txns.back());
 
@@ -486,7 +486,7 @@ public:
     ListCoinsTestingSetup()
     {
         CreateAndProcessBlock({}, GetScriptForRawPubKey(coinbaseKey.GetPubKey()));
-        wallet = MakeUnique<CWallet>(m_chain.get(), WalletLocation(), WalletDatabase::CreateMock());
+        wallet = MakeUnique<CWallet>(m_chain.get(), WalletLocation(), CreateMockWalletDatabase());
         {
             LOCK2(wallet->cs_wallet, ::cs_main);
             wallet->SetLastBlockProcessed(::ChainActive().Height(), ::ChainActive().Tip()->GetBlockHash());
@@ -604,7 +604,7 @@ BOOST_FIXTURE_TEST_CASE(wallet_disableprivkeys, TestChain100Setup)
 {
     NodeContext node;
     auto chain = interfaces::MakeChain(node);
-    std::shared_ptr<CWallet> wallet = std::make_shared<CWallet>(chain.get(), WalletLocation(), WalletDatabase::CreateDummy());
+    std::shared_ptr<CWallet> wallet = std::make_shared<CWallet>(chain.get(), WalletLocation(), CreateDummyWalletDatabase());
     wallet->SetupLegacyScriptPubKeyMan();
     wallet->SetMinVersion(FEATURE_LATEST);
     wallet->SetWalletFlag(WALLET_FLAG_DISABLE_PRIVATE_KEYS);
diff --git a/src/wallet/wallet.cpp b/src/wallet/wallet.cpp
index cf42c1cb3c..4037e23b69 100644
--- a/src/wallet/wallet.cpp
+++ b/src/wallet/wallet.cpp
@@ -3705,7 +3705,7 @@ bool CWallet::Verify(interfaces::Chain& chain, const WalletLocation& location, b
     }
 
     // Keep same database environment instance across Verify/Recover calls below.
-    std::unique_ptr<WalletDatabase> database = WalletDatabase::Create(wallet_path);
+    std::unique_ptr<WalletDatabase> database = CreateWalletDatabase(wallet_path);
 
     try {
         if (!WalletBatch::VerifyEnvironment(wallet_path, error_string)) {
@@ -3729,7 +3729,7 @@ std::shared_ptr<CWallet> CWallet::CreateWalletFromFile(interfaces::Chain& chain,
     if (gArgs.GetBoolArg("-zapwallettxes", false)) {
         chain.initMessage(_("Zapping all transactions from wallet...").translated);
 
-        std::unique_ptr<CWallet> tempWallet = MakeUnique<CWallet>(&chain, location, WalletDatabase::Create(location.GetPath()));
+        std::unique_ptr<CWallet> tempWallet = MakeUnique<CWallet>(&chain, location, CreateWalletDatabase(location.GetPath()));
         DBErrors nZapWalletRet = tempWallet->ZapWalletTx(vWtx);
         if (nZapWalletRet != DBErrors::LOAD_OK) {
             error = strprintf(_("Error loading %s: Wallet corrupted"), walletFile);
@@ -3743,7 +3743,7 @@ std::shared_ptr<CWallet> CWallet::CreateWalletFromFile(interfaces::Chain& chain,
     bool fFirstRun = true;
     // TODO: Can't use std::make_shared because we need a custom deleter but
     // should be possible to use std::allocate_shared.
-    std::shared_ptr<CWallet> walletInstance(new CWallet(&chain, location, WalletDatabase::Create(location.GetPath())), ReleaseWallet);
+    std::shared_ptr<CWallet> walletInstance(new CWallet(&chain, location, CreateWalletDatabase(location.GetPath())), ReleaseWallet);
     DBErrors nLoadWalletRet = walletInstance->LoadWallet(fFirstRun);
     if (nLoadWalletRet != DBErrors::LOAD_OK) {
         if (nLoadWalletRet == DBErrors::CORRUPT) {
diff --git a/src/wallet/walletdb.cpp b/src/wallet/walletdb.cpp
index 2f6c2b883a..6f38398076 100644
--- a/src/wallet/walletdb.cpp
+++ b/src/wallet/walletdb.cpp
@@ -1023,3 +1023,22 @@ bool IsWalletLoaded(const fs::path& wallet_path)
 {
     return IsBDBWalletLoaded(wallet_path);
 }
+
+/** Return object for accessing database at specified path. */
+std::unique_ptr<BerkeleyDatabase> CreateWalletDatabase(const fs::path& path)
+{
+    std::string filename;
+    return MakeUnique<BerkeleyDatabase>(GetWalletEnv(path, filename), std::move(filename));
+}
+
+/** Return object for accessing dummy database with no read/write capabilities. */
+std::unique_ptr<BerkeleyDatabase> CreateDummyWalletDatabase()
+{
+    return MakeUnique<BerkeleyDatabase>();
+}
+
+/** Return object for accessing temporary in-memory database. */
+std::unique_ptr<BerkeleyDatabase> CreateMockWalletDatabase()
+{
+    return MakeUnique<BerkeleyDatabase>(std::make_shared<BerkeleyEnvironment>(), "");
+}
diff --git a/src/wallet/walletdb.h b/src/wallet/walletdb.h
index 1037bd579f..61e0f19e56 100644
--- a/src/wallet/walletdb.h
+++ b/src/wallet/walletdb.h
@@ -293,4 +293,13 @@ bool ReadKeyValue(CWallet* pwallet, CDataStream& ssKey, CDataStream& ssValue, st
 /** Return whether a wallet database is currently loaded. */
 bool IsWalletLoaded(const fs::path& wallet_path);
 
+/** Return object for accessing database at specified path. */
+std::unique_ptr<BerkeleyDatabase> CreateWalletDatabase(const fs::path& path);
+
+/** Return object for accessing dummy database with no read/write capabilities. */
+std::unique_ptr<BerkeleyDatabase> CreateDummyWalletDatabase();
+
+/** Return object for accessing temporary in-memory database. */
+std::unique_ptr<BerkeleyDatabase> CreateMockWalletDatabase();
+
 #endif // BITCOIN_WALLET_WALLETDB_H
diff --git a/src/wallet/wallettool.cpp b/src/wallet/wallettool.cpp
index be07c28503..77ed6beb5d 100644
--- a/src/wallet/wallettool.cpp
+++ b/src/wallet/wallettool.cpp
@@ -28,7 +28,7 @@ static std::shared_ptr<CWallet> CreateWallet(const std::string& name, const fs::
         return nullptr;
     }
     // dummy chain interface
-    std::shared_ptr<CWallet> wallet_instance(new CWallet(nullptr /* chain */, WalletLocation(name), WalletDatabase::Create(path)), WalletToolReleaseWallet);
+    std::shared_ptr<CWallet> wallet_instance(new CWallet(nullptr /* chain */, WalletLocation(name), CreateWalletDatabase(path)), WalletToolReleaseWallet);
     LOCK(wallet_instance->cs_wallet);
     bool first_run = true;
     DBErrors load_wallet_ret = wallet_instance->LoadWallet(first_run);
@@ -57,7 +57,7 @@ static std::shared_ptr<CWallet> LoadWallet(const std::string& name, const fs::pa
     }
 
     // dummy chain interface
-    std::shared_ptr<CWallet> wallet_instance(new CWallet(nullptr /* chain */, WalletLocation(name), WalletDatabase::Create(path)), WalletToolReleaseWallet);
+    std::shared_ptr<CWallet> wallet_instance(new CWallet(nullptr /* chain */, WalletLocation(name), CreateWalletDatabase(path)), WalletToolReleaseWallet);
     DBErrors load_wallet_ret;
     try {
         bool first_run;
@@ -107,7 +107,7 @@ static void WalletShowInfo(CWallet* wallet_instance)
 static bool SalvageWallet(const fs::path& path)
 {
     // Create a Database handle to allow for the db to be initialized before recovery
-    std::unique_ptr<WalletDatabase> database = WalletDatabase::Create(path);
+    std::unique_ptr<WalletDatabase> database = CreateWalletDatabase(path);
 
     // Initialize the environment before recovery
     bilingual_str error_string;