merge `master` into `loek/savemgr`loek/savemgr

1 files changed, 67 insertions, 0 deletions

diff --git a/src/crepe/facade/DB.cpp b/src/crepe/facade/DB.cpp
new file mode 100644
index 0000000..bd2f089
--- /dev/null
+++ b/src/crepe/facade/DB.cpp
@@ -0,0 +1,67 @@
+#include <cstring>
+
+#include "util/log.h"
+
+#include "DB.h"
+
+using namespace std;
+using namespace crepe;
+
+DB::DB(const string & path) {
+	dbg_trace();
+	int ret;
+
+	// init database struct
+	libdb::DB * db;
+	if ((ret = libdb::db_create(&db, NULL, 0)) != 0)
+		throw nullptr; // TODO: exception
+	this->db = { db, [] (libdb::DB * db) { db->close(db, 0); } };
+
+	// load or create database file
+	if ((ret = this->db->open(this->db.get(), NULL, path.c_str(), NULL, libdb::DB_BTREE, DB_CREATE, 0)) != 0) {
+		throw nullptr;
+	}
+
+	// create cursor
+	libdb::DBC * cursor;
+	if ((ret = this->db->cursor(this->db.get(), NULL, &cursor, 0)) != 0) {
+		throw nullptr;
+	}
+	this->cursor = { cursor, [] (libdb::DBC * cursor) { cursor->close(cursor); } };
+}
+
+
+libdb::DBT DB::to_thing(const string & thing) const {
+	libdb::DBT thang;
+	memset(&thang, 0, sizeof(libdb::DBT));
+	thang.data = (void *) thing.data();
+	thang.size = thing.size();
+	return thang;
+}
+
+string DB::get(const string & key) {
+	libdb::DBT db_key = this->to_thing(key);
+	libdb::DBT db_val;
+	memset(&db_val, 0, sizeof(libdb::DBT));
+
+	int ret = this->cursor->get(this->cursor.get(), &db_key, &db_val, DB_FIRST);
+	if (ret != 0) throw nullptr; // TODO: proper exception
+	return { static_cast<char *>(db_val.data), db_val.size };
+}
+
+void DB::set(const string & key, const string & value) {
+	libdb::DBT db_key = this->to_thing(key);
+	libdb::DBT db_val = this->to_thing(value);
+	int ret = this->db->put(this->db.get(), NULL, &db_key, &db_val, 0);
+	if (ret != 0) throw nullptr; // TODO: proper exception
+}
+
+bool DB::has(const std::string & key) noexcept {
+	try {
+		this->get(key);
+	} catch (...) {
+		return false;
+	}
+	return true;
+}
+