Merge bitcoin#23732: refactor: Remove gArgs from bdb.h and sqlite.h

39b1763 Replace use of `ArgsManager` with `DatabaseOptions` (Kiminuo)

Pull request description:

  Contributes to bitcoin#21005.

  The goal of this PR is to remove `gArgs` from database classes (i.e. `bdb.h` and `sqlite.h`) so that they can be tested without relying on `gArgs` in tests.

  Notes:

  * My goal is to enable unit-testing without relying on `gArgs` as much as possible. Global variables are hard to reason about which in turn makes it slightly harder to contribute to this codebase. When the compiler does the heavy lifting for us and allows us only to construct an object (or call a method) with valid parameters, we may also save some time in code reviews. The cost for this is passing an argument which is not for free but the cost is very miniscule compared to benefits, I think.
      * GUI code is an exception because it seems fine to have `gArgs` there so I don't plan to make changes in `src/qt` folder, for example.
  * My approach to removal of `gArgs` uses is moving from lower levels to upper ones and pass `ArgsManager` as an argument as needed. The approach is very similar to what bitcoin#20158.

ACKs for top commit:
  achow101:
    ACK 39b1763
  ryanofsky:
    Code review ACK 39b1763. Just the two small ReadDatabaseArgs and Berkeley open changes that were discussed since the last review

Tree-SHA512: aa066b314db593e46c18698fe8cdd500f558b405dc04e4a9a3ff57b52b5b3a81a6cb090e0e661785d1d02c1bf18958c1f4cd715ff233aab63381e3f80960622d

Author: MarcoFalke

src/wallet/bdb.cpp

@@ -60,12 +60,12 @@ bool WalletDatabaseFileId::operator==(const WalletDatabaseFileId& rhs) const
  * erases the weak pointer from the g_dbenvs map.
  * @post A new BerkeleyEnvironment weak pointer is inserted into g_dbenvs if the directory path key was not already in the map.
  */
-std::shared_ptr<BerkeleyEnvironment> GetBerkeleyEnv(const fs::path& env_directory)
+std::shared_ptr<BerkeleyEnvironment> GetBerkeleyEnv(const fs::path& env_directory, bool use_shared_memory)
 {
     LOCK(cs_db);
     auto inserted = g_dbenvs.emplace(fs::PathToString(env_directory), std::weak_ptr<BerkeleyEnvironment>());
     if (inserted.second) {
-        auto env = std::make_shared<BerkeleyEnvironment>(env_directory);
+        auto env = std::make_shared<BerkeleyEnvironment>(env_directory, use_shared_memory);
         inserted.first->second = env;
         return env;
     }
@@ -113,7 +113,7 @@ void BerkeleyEnvironment::Reset()
     fMockDb = false;
 }
 
-BerkeleyEnvironment::BerkeleyEnvironment(const fs::path& dir_path) : strPath(fs::PathToString(dir_path))
+BerkeleyEnvironment::BerkeleyEnvironment(const fs::path& dir_path, bool use_shared_memory) : strPath(fs::PathToString(dir_path)), m_use_shared_memory(use_shared_memory)
 {
     Reset();
 }
@@ -145,8 +145,9 @@ bool BerkeleyEnvironment::Open(bilingual_str& err)
     LogPrintf("BerkeleyEnvironment::Open: LogDir=%s ErrorFile=%s\n", fs::PathToString(pathLogDir), fs::PathToString(pathErrorFile));
 
     unsigned int nEnvFlags = 0;
-    if (gArgs.GetBoolArg("-privdb", DEFAULT_WALLET_PRIVDB))
+    if (!m_use_shared_memory) {
         nEnvFlags |= DB_PRIVATE;
+    }
 
     dbenv->set_lg_dir(fs::PathToString(pathLogDir).c_str());
     dbenv->set_cachesize(0, 0x100000, 1); // 1 MiB should be enough for just the wallet
@@ -188,7 +189,7 @@ bool BerkeleyEnvironment::Open(bilingual_str& err)
 }
 
 //! Construct an in-memory mock Berkeley environment for testing
-BerkeleyEnvironment::BerkeleyEnvironment()
+BerkeleyEnvironment::BerkeleyEnvironment() : m_use_shared_memory(false)
 {
     Reset();
 
@@ -377,7 +378,7 @@ void BerkeleyBatch::Flush()
         nMinutes = 1;
 
     if (env) { // env is nullptr for dummy databases (i.e. in tests). Don't actually flush if env is nullptr so we don't segfault
-        env->dbenv->txn_checkpoint(nMinutes ? gArgs.GetIntArg("-dblogsize", DEFAULT_WALLET_DBLOGSIZE) * 1024 : 0, nMinutes, 0);
+        env->dbenv->txn_checkpoint(nMinutes ? m_database.m_max_log_mb * 1024 : 0, nMinutes, 0);
     }
 }
 
@@ -831,13 +832,13 @@ std::unique_ptr<BerkeleyDatabase> MakeBerkeleyDatabase(const fs::path& path, con
     {
         LOCK(cs_db); // Lock env.m_databases until insert in BerkeleyDatabase constructor
         std::string data_filename = fs::PathToString(data_file.filename());
-        std::shared_ptr<BerkeleyEnvironment> env = GetBerkeleyEnv(data_file.parent_path());
+        std::shared_ptr<BerkeleyEnvironment> env = GetBerkeleyEnv(data_file.parent_path(), options.use_shared_memory);
         if (env->m_databases.count(data_filename)) {
             error = Untranslated(strprintf("Refusing to load database. Data file '%s' is already loaded.", fs::PathToString(env->Directory() / data_filename)));
             status = DatabaseStatus::FAILED_ALREADY_LOADED;
             return nullptr;
         }
-        db = std::make_unique<BerkeleyDatabase>(std::move(env), std::move(data_filename));
+        db = std::make_unique<BerkeleyDatabase>(std::move(env), std::move(data_filename), options);
     }
 
     if (options.verify && !db->Verify(error)) {

src/wallet/bdb.h

@@ -32,8 +32,6 @@
 struct bilingual_str;
 
 namespace wallet {
-static const unsigned int DEFAULT_WALLET_DBLOGSIZE = 100;
-static const bool DEFAULT_WALLET_PRIVDB = true;
 
 struct WalletDatabaseFileId {
     u_int8_t value[DB_FILE_ID_LEN];
@@ -56,8 +54,9 @@ class BerkeleyEnvironment
     std::map<std::string, std::reference_wrapper<BerkeleyDatabase>> m_databases;
     std::unordered_map<std::string, WalletDatabaseFileId> m_fileids;
     std::condition_variable_any m_db_in_use;
+    bool m_use_shared_memory;
 
-    explicit BerkeleyEnvironment(const fs::path& env_directory);
+    explicit BerkeleyEnvironment(const fs::path& env_directory, bool use_shared_memory);
     BerkeleyEnvironment();
     ~BerkeleyEnvironment();
     void Reset();
@@ -85,7 +84,7 @@ class BerkeleyEnvironment
 };
 
 /** Get BerkeleyEnvironment given a directory path. */
-std::shared_ptr<BerkeleyEnvironment> GetBerkeleyEnv(const fs::path& env_directory);
+std::shared_ptr<BerkeleyEnvironment> GetBerkeleyEnv(const fs::path& env_directory, bool use_shared_memory);
 
 class BerkeleyBatch;
 
@@ -98,8 +97,8 @@ class BerkeleyDatabase : public WalletDatabase
     BerkeleyDatabase() = delete;
 
     /** Create DB handle to real database */
-    BerkeleyDatabase(std::shared_ptr<BerkeleyEnvironment> env, std::string filename) :
-        WalletDatabase(), env(std::move(env)), strFile(std::move(filename))
+    BerkeleyDatabase(std::shared_ptr<BerkeleyEnvironment> env, std::string filename, const DatabaseOptions& options) :
+        WalletDatabase(), env(std::move(env)), strFile(std::move(filename)), m_max_log_mb(options.max_log_mb)
     {
         auto inserted = this->env->m_databases.emplace(strFile, std::ref(*this));
         assert(inserted.second);
@@ -160,6 +159,7 @@ class BerkeleyDatabase : public WalletDatabase
     std::unique_ptr<Db> m_db;
 
     std::string strFile;
+    int64_t m_max_log_mb;
 
     /** Make a BerkeleyBatch connected to this database */
     std::unique_ptr<DatabaseBatch> MakeBatch(bool flush_on_close = true) override;

src/wallet/db.cpp

@@ -6,6 +6,7 @@
 #include <chainparams.h>
 #include <fs.h>
 #include <logging.h>
+#include <util/system.h>
 #include <wallet/db.h>
 
 #include <exception>
@@ -137,4 +138,13 @@ bool IsSQLiteFile(const fs::path& path)
     // Check the application id matches our network magic
     return memcmp(Params().MessageStart(), app_id, 4) == 0;
 }
+
+void ReadDatabaseArgs(const ArgsManager& args, DatabaseOptions& options)
+{
+    // Override current options with args values, if any were specified
+    options.use_unsafe_sync = args.GetBoolArg("-unsafesqlitesync", options.use_unsafe_sync);
+    options.use_shared_memory = !args.GetBoolArg("-privdb", !options.use_shared_memory);
+    options.max_log_mb = args.GetIntArg("-dblogsize", options.max_log_mb);
+}
+
 } // namespace wallet

src/wallet/db.h

@@ -16,6 +16,7 @@
 #include <optional>
 #include <string>
 
+class ArgsManager;
 struct bilingual_str;
 
 namespace wallet {
@@ -207,7 +208,12 @@ struct DatabaseOptions {
     std::optional<DatabaseFormat> require_format;
     uint64_t create_flags = 0;
     SecureString create_passphrase;
-    bool verify = true;
+
+    // Specialized options. Not every option is supported by every backend.
+    bool verify = true;             //!< Check data integrity on load.
+    bool use_unsafe_sync = false;   //!< Disable file sync for faster performance.
+    bool use_shared_memory = false; //!< Let other processes access the database.
+    int64_t max_log_mb = 100;       //!< Max log size to allow before consolidating.
 };
 
 enum class DatabaseStatus {
@@ -227,6 +233,7 @@ enum class DatabaseStatus {
 /** Recursively list database paths in directory. */
 std::vector<fs::path> ListDatabases(const fs::path& path);
 
+void ReadDatabaseArgs(const ArgsManager& args, DatabaseOptions& options);
 std::unique_ptr<WalletDatabase> MakeDatabase(const fs::path& path, const DatabaseOptions& options, DatabaseStatus& status, bilingual_str& error);
 
 fs::path BDBDataFile(const fs::path& path);

src/wallet/dump.cpp

@@ -19,10 +19,10 @@ namespace wallet {
 static const std::string DUMP_MAGIC = "BITCOIN_CORE_WALLET_DUMP";
 uint32_t DUMP_VERSION = 1;
 
-bool DumpWallet(CWallet& wallet, bilingual_str& error)
+bool DumpWallet(const ArgsManager& args, CWallet& wallet, bilingual_str& error)
 {
     // Get the dumpfile
-    std::string dump_filename = gArgs.GetArg("-dumpfile", "");
+    std::string dump_filename = args.GetArg("-dumpfile", "");
     if (dump_filename.empty()) {
         error = _("No dump file provided. To use dump, -dumpfile=<filename> must be provided.");
         return false;
@@ -114,10 +114,10 @@ static void WalletToolReleaseWallet(CWallet* wallet)
     delete wallet;
 }
 
-bool CreateFromDump(const std::string& name, const fs::path& wallet_path, bilingual_str& error, std::vector<bilingual_str>& warnings)
+bool CreateFromDump(const ArgsManager& args, const std::string& name, const fs::path& wallet_path, bilingual_str& error, std::vector<bilingual_str>& warnings)
 {
     // Get the dumpfile
-    std::string dump_filename = gArgs.GetArg("-dumpfile", "");
+    std::string dump_filename = args.GetArg("-dumpfile", "");
     if (dump_filename.empty()) {
         error = _("No dump file provided. To use createfromdump, -dumpfile=<filename> must be provided.");
         return false;
@@ -171,7 +171,7 @@ bool CreateFromDump(const std::string& name, const fs::path& wallet_path, biling
         return false;
     }
     // Get the data file format with format_value as the default
-    std::string file_format = gArgs.GetArg("-format", format_value);
+    std::string file_format = args.GetArg("-format", format_value);
     if (file_format.empty()) {
         error = _("No wallet file format provided. To use createfromdump, -format=<format> must be provided.");
         return false;
@@ -193,6 +193,7 @@ bool CreateFromDump(const std::string& name, const fs::path& wallet_path, biling
 
     DatabaseOptions options;
     DatabaseStatus status;
+    ReadDatabaseArgs(args, options);
     options.require_create = true;
     options.require_format = data_format;
     std::unique_ptr<WalletDatabase> database = MakeDatabase(wallet_path, options, status, error);

src/wallet/dump.h

@@ -11,11 +11,12 @@
 #include <vector>
 
 struct bilingual_str;
+class ArgsManager;
 
 namespace wallet {
 class CWallet;
-bool DumpWallet(CWallet& wallet, bilingual_str& error);
-bool CreateFromDump(const std::string& name, const fs::path& wallet_path, bilingual_str& error, std::vector<bilingual_str>& warnings);
+bool DumpWallet(const ArgsManager& args, CWallet& wallet, bilingual_str& error);
+bool CreateFromDump(const ArgsManager& args, const std::string& name, const fs::path& wallet_path, bilingual_str& error, std::vector<bilingual_str>& warnings);
 } // namespace wallet
 
 #endif // BITCOIN_WALLET_DUMP_H

src/wallet/init.cpp

@@ -80,9 +80,9 @@ void WalletInit::AddWalletOptions(ArgsManager& argsman) const
     argsman.AddArg("-walletrbf", strprintf("Send transactions with full-RBF opt-in enabled (RPC only, default: %u)", DEFAULT_WALLET_RBF), ArgsManager::ALLOW_ANY, OptionsCategory::WALLET);
 
 #ifdef USE_BDB
-    argsman.AddArg("-dblogsize=<n>", strprintf("Flush wallet database activity from memory to disk log every <n> megabytes (default: %u)", DEFAULT_WALLET_DBLOGSIZE), ArgsManager::ALLOW_ANY | ArgsManager::DEBUG_ONLY, OptionsCategory::WALLET_DEBUG_TEST);
+    argsman.AddArg("-dblogsize=<n>", strprintf("Flush wallet database activity from memory to disk log every <n> megabytes (default: %u)", DatabaseOptions().max_log_mb), ArgsManager::ALLOW_ANY | ArgsManager::DEBUG_ONLY, OptionsCategory::WALLET_DEBUG_TEST);
     argsman.AddArg("-flushwallet", strprintf("Run a thread to flush wallet periodically (default: %u)", DEFAULT_FLUSHWALLET), ArgsManager::ALLOW_ANY | ArgsManager::DEBUG_ONLY, OptionsCategory::WALLET_DEBUG_TEST);
-    argsman.AddArg("-privdb", strprintf("Sets the DB_PRIVATE flag in the wallet db environment (default: %u)", DEFAULT_WALLET_PRIVDB), ArgsManager::ALLOW_ANY | ArgsManager::DEBUG_ONLY, OptionsCategory::WALLET_DEBUG_TEST);
+    argsman.AddArg("-privdb", strprintf("Sets the DB_PRIVATE flag in the wallet db environment (default: %u)", !DatabaseOptions().use_shared_memory), ArgsManager::ALLOW_ANY | ArgsManager::DEBUG_ONLY, OptionsCategory::WALLET_DEBUG_TEST);
 #else
     argsman.AddHiddenArgs({"-dblogsize", "-flushwallet", "-privdb"});
 #endif

src/wallet/interfaces.cpp

@@ -544,6 +544,7 @@ class WalletLoaderImpl : public WalletLoader
         std::shared_ptr<CWallet> wallet;
         DatabaseOptions options;
         DatabaseStatus status;
+        ReadDatabaseArgs(*m_context.args, options);
         options.require_create = true;
         options.create_flags = wallet_creation_flags;
         options.create_passphrase = passphrase;
@@ -553,6 +554,7 @@ class WalletLoaderImpl : public WalletLoader
     {
         DatabaseOptions options;
         DatabaseStatus status;
+        ReadDatabaseArgs(*m_context.args, options);
         options.require_existing = true;
         return MakeWallet(m_context, LoadWallet(m_context, name, true /* load_on_start */, options, status, error, warnings));
     }

src/wallet/load.cpp

@@ -57,6 +57,7 @@ bool VerifyWallets(WalletContext& context)
     if (!args.IsArgSet("wallet")) {
         DatabaseOptions options;
         DatabaseStatus status;
+        ReadDatabaseArgs(args, options);
         bilingual_str error_string;
         options.require_existing = true;
         options.verify = false;
@@ -84,6 +85,7 @@ bool VerifyWallets(WalletContext& context)
 
         DatabaseOptions options;
         DatabaseStatus status;
+        ReadDatabaseArgs(args, options);
         options.require_existing = true;
         options.verify = true;
         bilingual_str error_string;
@@ -112,6 +114,7 @@ bool LoadWallets(WalletContext& context)
             }
             DatabaseOptions options;
             DatabaseStatus status;
+            ReadDatabaseArgs(*context.args, options);
             options.require_existing = true;
             options.verify = false; // No need to verify, assuming verified earlier in VerifyWallets()
             bilingual_str error;

src/wallet/rpc/wallet.cpp

@@ -8,6 +8,7 @@
 #include <rpc/server.h>
 #include <rpc/util.h>
 #include <util/translation.h>
+#include <wallet/context.h>
 #include <wallet/receive.h>
 #include <wallet/rpc/wallet.h>
 #include <wallet/rpc/util.h>
@@ -220,6 +221,7 @@ static RPCHelpMan loadwallet()
 
     DatabaseOptions options;
     DatabaseStatus status;
+    ReadDatabaseArgs(*context.args, options);
     options.require_existing = true;
     bilingual_str error;
     std::vector<bilingual_str> warnings;
@@ -381,6 +383,7 @@ static RPCHelpMan createwallet()
 
     DatabaseOptions options;
     DatabaseStatus status;
+    ReadDatabaseArgs(*context.args, options);
     options.require_create = true;
     options.create_flags = flags;
     options.create_passphrase = passphrase;