Add MetaDataRef:get_keys (#12841)

src/database/database-dummy.cpp

@@ -92,6 +92,17 @@ bool Database_Dummy::getModEntries(const std::string &modname, StringMap *storag
 	return true;
 }
 
+bool Database_Dummy::getModKeys(const std::string &modname, std::vector<std::string> *storage)
+{
+	const auto mod_pair = m_mod_meta_database.find(modname);
+	if (mod_pair != m_mod_meta_database.cend()) {
+		storage->reserve(storage->size() + mod_pair->second.size());
+		for (const auto &pair : mod_pair->second)
+			storage->push_back(pair.first);
+	}
+	return true;
+}
+
 bool Database_Dummy::getModEntry(const std::string &modname,
 	const std::string &key, std::string *value)
 {

src/database/database-dummy.h

@@ -38,6 +38,7 @@ public:
 	void listPlayers(std::vector<std::string> &res);
 
 	bool getModEntries(const std::string &modname, StringMap *storage);
+	bool getModKeys(const std::string &modname, std::vector<std::string> *storage);
 	bool getModEntry(const std::string &modname,
 			const std::string &key, std::string *value);
 	bool hasModEntry(const std::string &modname, const std::string &key);

src/database/database-files.cpp

@@ -396,6 +396,21 @@ bool ModMetadataDatabaseFiles::getModEntries(const std::string &modname, StringM
 	return true;
 }
 
+bool ModMetadataDatabaseFiles::getModKeys(const std::string &modname,
+		std::vector<std::string> *storage)
+{
+	Json::Value *meta = getOrCreateJson(modname);
+	if (!meta)
+		return false;
+
+	std::vector<std::string> keys = meta->getMemberNames();
+	storage->reserve(storage->size() + keys.size());
+	for (std::string &key : keys)
+		storage->push_back(std::move(key));
+
+	return true;
+}
+
 bool ModMetadataDatabaseFiles::getModEntry(const std::string &modname,
 	const std::string &key, std::string *value)
 {

src/database/database-files.h

@@ -79,6 +79,7 @@ public:
 	virtual ~ModMetadataDatabaseFiles() = default;
 
 	virtual bool getModEntries(const std::string &modname, StringMap *storage);
+	virtual bool getModKeys(const std::string &modname, std::vector<std::string> *storage);
 	virtual bool getModEntry(const std::string &modname,
 		const std::string &key, std::string *value);
 	virtual bool hasModEntry(const std::string &modname, const std::string &key);

src/database/database-sqlite3.cpp

@@ -775,6 +775,7 @@ ModMetadataDatabaseSQLite3::~ModMetadataDatabaseSQLite3()
 	FINALIZE_STATEMENT(m_stmt_set)
 	FINALIZE_STATEMENT(m_stmt_has)
 	FINALIZE_STATEMENT(m_stmt_get)
+	FINALIZE_STATEMENT(m_stmt_get_keys)
 	FINALIZE_STATEMENT(m_stmt_get_all)
 }
 
@@ -796,6 +797,7 @@ void ModMetadataDatabaseSQLite3::createDatabase()
 void ModMetadataDatabaseSQLite3::initStatements()
 {
 	PREPARE_STATEMENT(get_all, "SELECT `key`, `value` FROM `entries` WHERE `modname` = ?");
+	PREPARE_STATEMENT(get_keys, "SELECT `key` FROM `entries` WHERE `modname` = ?");
 	PREPARE_STATEMENT(get,
 		"SELECT `value` FROM `entries` WHERE `modname` = ? AND `key` = ? LIMIT 1");
 	PREPARE_STATEMENT(has,
@@ -825,6 +827,24 @@ bool ModMetadataDatabaseSQLite3::getModEntries(const std::string &modname, Strin
 	return true;
 }
 
+bool ModMetadataDatabaseSQLite3::getModKeys(const std::string &modname,
+		std::vector<std::string> *storage)
+{
+	verifyDatabase();
+
+	str_to_sqlite(m_stmt_get_keys, 1, modname);
+	while (sqlite3_step(m_stmt_get_keys) == SQLITE_ROW) {
+		const char *key_data = (const char *) sqlite3_column_blob(m_stmt_get_keys, 0);
+		size_t key_len = sqlite3_column_bytes(m_stmt_get_keys, 0);
+		storage->emplace_back(key_data, key_len);
+	}
+	sqlite3_vrfy(sqlite3_errcode(m_database), SQLITE_DONE);
+
+	sqlite3_reset(m_stmt_get_keys);
+
+	return true;
+}
+
 bool ModMetadataDatabaseSQLite3::getModEntry(const std::string &modname,
 	const std::string &key, std::string *value)
 {

src/database/database-sqlite3.h

@@ -240,6 +240,7 @@ public:
 	virtual ~ModMetadataDatabaseSQLite3();
 
 	virtual bool getModEntries(const std::string &modname, StringMap *storage);
+	virtual bool getModKeys(const std::string &modname, std::vector<std::string> *storage);
 	virtual bool getModEntry(const std::string &modname,
 		const std::string &key, std::string *value);
 	virtual bool hasModEntry(const std::string &modname, const std::string &key);
@@ -258,6 +259,7 @@ protected:
 
 private:
 	sqlite3_stmt *m_stmt_get_all = nullptr;
+	sqlite3_stmt *m_stmt_get_keys = nullptr;
 	sqlite3_stmt *m_stmt_get = nullptr;
 	sqlite3_stmt *m_stmt_has = nullptr;
 	sqlite3_stmt *m_stmt_set = nullptr;

src/database/database.h

@@ -92,6 +92,7 @@ public:
 	virtual ~ModMetadataDatabase() = default;
 
 	virtual bool getModEntries(const std::string &modname, StringMap *storage) = 0;
+	virtual bool getModKeys(const std::string &modname, std::vector<std::string> *storage) = 0;
 	virtual bool hasModEntry(const std::string &modname, const std::string &key) = 0;
 	virtual bool getModEntry(const std::string &modname,
 		const std::string &key, std::string *value) = 0;