Merge #11687: External wallet files

be8ab7d08 Create new wallet databases as directories rather than files (Russell Yanofsky)
26c06f24e Allow wallet files not in -walletdir directory (Russell Yanofsky)
d8a99f65e Allow wallet files in multiple directories (Russell Yanofsky)

Pull request description:

  This change consists of three commits:

  * The first commit is a pure refactoring that removes the restriction that two wallets can only be opened at the same time if they are contained in the same directory.
  * The second commit removes the restriction that `-wallet` filenames can only refer to files in the `-walletdir` directory.
  * The third commit makes second commit a little safer by changing bitcoin to create wallet databases as directories rather than files, so they can be safely backed up.

  All three commits should be straightforward:

  *  The first commit adds around 20 lines of new code and then updates a bunch of function signatures (generally updating them to take plain fs::path parameters, instead of combinations of strings, fs::paths, and objects like CDBEnv and CWalletDBWrapper).
  * The second commit removes two `-wallet` filename checks and adds some test cases to the multiwallet unit test.
  * The third commit just changes the mapping from specified wallet paths to bdb environment & data paths.

    ---

  **Note:** For anybody looking at this PR for the first time, I think you can skip the comments before _20 Nov_ and start reading at https://github.com/bitcoin/bitcoin/pull/11687#issuecomment-345625565. Comments before  _20 Nov_ were about an earlier version of the PR that didn't include the third commit, and then confusion from not seeing the first commit.

Tree-SHA512: 00bbb120fe0df847cf57014f75f1f7f1f58b0b62fa0b3adab4560163ebdfe06ccdfff33b4231693f03c5dc23601cb41954a07bcea9a4919c8d42f7d62bcf6024

1 files changed, 5 insertions, 6 deletions

diff --git a/src/wallet/wallet.cpp b/src/wallet/wallet.cpp
index a014f5b2a0..0c468878e1 100644
--- a/src/wallet/wallet.cpp
+++ b/src/wallet/wallet.cpp
@@ -45,7 +45,6 @@ OutputType g_address_type = OUTPUT_TYPE_NONE;
 OutputType g_change_type = OUTPUT_TYPE_NONE;
 bool g_wallet_allow_fallback_fee = true; //<! will be defined via chainparams
 
-const char * DEFAULT_WALLET_DAT = "wallet.dat";
 const uint32_t BIP32_HARDENED_KEY_LIMIT = 0x80000000;
 
 /**
@@ -3908,16 +3907,17 @@ std::vector<std::string> CWallet::GetDestValues(const std::string& prefix) const
     return values;
 }
 
-CWallet* CWallet::CreateWalletFromFile(const std::string walletFile)
+CWallet* CWallet::CreateWalletFromFile(const std::string& name, const fs::path& path)
 {
+    const std::string& walletFile = name;
+
     // needed to restore wallet transaction meta data after -zapwallettxes
     std::vector<CWalletTx> vWtx;
 
     if (gArgs.GetBoolArg("-zapwallettxes", false)) {
         uiInterface.InitMessage(_("Zapping all transactions from wallet..."));
 
-        std::unique_ptr<CWalletDBWrapper> dbw(new CWalletDBWrapper(&bitdb, walletFile));
-        std::unique_ptr<CWallet> tempWallet = MakeUnique<CWallet>(std::move(dbw));
+        std::unique_ptr<CWallet> tempWallet = MakeUnique<CWallet>(name, CWalletDBWrapper::Create(path));
         DBErrors nZapWalletRet = tempWallet->ZapWalletTx(vWtx);
         if (nZapWalletRet != DB_LOAD_OK) {
             InitError(strprintf(_("Error loading %s: Wallet corrupted"), walletFile));
@@ -3929,8 +3929,7 @@ CWallet* CWallet::CreateWalletFromFile(const std::string walletFile)
 
     int64_t nStart = GetTimeMillis();
     bool fFirstRun = true;
-    std::unique_ptr<CWalletDBWrapper> dbw(new CWalletDBWrapper(&bitdb, walletFile));
-    CWallet *walletInstance = new CWallet(std::move(dbw));
+    CWallet *walletInstance = new CWallet(name, CWalletDBWrapper::Create(path));
     DBErrors nLoadWalletRet = walletInstance->LoadWallet(fFirstRun);
     if (nLoadWalletRet != DB_LOAD_OK)
     {