Behavior Adjustment:

- Change path to ${current}/.data/

Dockerfile

@@ -14,13 +14,14 @@ RUN dart compile exe bin/tcp_server.dart -o bin/tcp_server
 
 FROM ubuntu:latest
 
-RUN apt-get update
-RUN apt-get -y install libsqlite3-0 libsqlite3-dev
+RUN apt-get update && apt-get -y install libsqlite3-0 libsqlite3-dev
 
 # Copy the previously built executable into the scratch layer
-COPY --from=compile /runtime/ ~/server/
-COPY --from=compile /lchatserver/bin/tcp_server ~/server/lchatserver/bin/
+RUN mkdir /lchatserver
+COPY --from=compile /runtime/ /lchatserver/
+COPY --from=compile /lchatserver/bin/tcp_server /lchatserver/bin/
 
 # Start server.
 EXPOSE 20706
-CMD ["~/server/lchatserver/bin/tcp_server"]
+WORKDIR /lchatserver/bin
+CMD ["/lchatserver/bin/tcp_server"]

bin/tcp_server.dart

@@ -1,7 +1,7 @@
 /*
  * @Author       : Linloir
  * @Date         : 2022-10-06 15:44:16
- * @LastEditTime : 2022-10-20 16:34:10
+ * @LastEditTime : 2022-10-20 20:25:43
  * @Description  : 
  */
 
@@ -17,10 +17,13 @@ import 'package:tcp_server/tcpcontroller/response.dart';
 void main(List<String> arguments) async {
   //Set address
   var port = arguments.isEmpty ? 20706 : int.tryParse(arguments[1]) ?? 20706;
+
+  print('[L] [STARTUP  ]-----------------------');
+  print('[L] Running at directory ${Directory.current.path}');
   
   //Create nessesary working directories
-  await Directory('${Directory.current.path}/.tmp').create();
   await Directory('${Directory.current.path}/.data').create();
+  await Directory('${Directory.current.path}/.data/.tmp').create();
   await Directory('${Directory.current.path}/.data/files').create();
 
   await DataBaseHelper().initialize();

lib/database.dart

@@ -1,7 +1,7 @@
 /*
  * @Author       : Linloir
  * @Date         : 2022-10-06 16:15:01
- * @LastEditTime : 2022-10-20 13:14:40
+ * @LastEditTime : 2022-10-20 20:58:57
  * @Description  : 
  */
 
@@ -25,7 +25,7 @@ class DataBaseHelper {
 
   Future<void> initialize() async {
     _database = await databaseFactoryFfi.openDatabase(
-      '${Directory.current.path}/.tmp/database.db',
+      '${Directory.current.path}/.data/.tmp/database.db',
       options: OpenDatabaseOptions(
         version: 1,
         onCreate: (db, version) async {
@@ -34,7 +34,7 @@ class DataBaseHelper {
             '''
               CREATE TABLE users (
                 userid    integer primary key autoincrement,
-                username  text not null,
+                username  text unique not null,
                 passwd    text not null,
                 avatar    text
               );
@@ -241,17 +241,29 @@ class DataBaseHelper {
     
     //Insert into users
     try {
-      await _database.insert(
-        'users',
-        {
-          'username': identity.userName,
-          'passwd': identity.userPasswd,
-          'avatar': null
-        },
-        conflictAlgorithm: ConflictAlgorithm.rollback
-      );
-    } catch (conflict) {
-      throw Exception(['Database failure', conflict.toString()]);
+      await _database.transaction((txn) async {
+        var result = await txn.query(
+          'users',
+          where: 'username = ?',
+          whereArgs: [
+            identity.userName
+          ]
+        );
+        if(result.isNotEmpty) {
+          throw Exception('Username already exists');
+        }
+        await txn.insert(
+          'users',
+          {
+            'username': identity.userName,
+            'passwd': identity.userPasswd,
+            'avatar': null
+          },
+          conflictAlgorithm: ConflictAlgorithm.rollback
+        );
+      });
+    } catch (e) {
+      rethrow;
     }
 
     //Get new userid

lib/tcpcontroller/controller.dart

@@ -1,7 +1,7 @@
 /*
  * @Author       : Linloir
  * @Date         : 2022-10-08 15:10:04
- * @LastEditTime : 2022-10-20 17:33:52
+ * @LastEditTime : 2022-10-20 20:20:00
  * @Description  : 
  */
 
@@ -133,7 +133,7 @@ class TCPController {
           //Create a future that listens to the status of the payload transmission
           () {
             var payloadPullStream = _payloadPullStreamController.stream;
-            var tempFile = File('${Directory.current.path}/.tmp/${DateTime.now().microsecondsSinceEpoch}$_fileCounter')..createSync();
+            var tempFile = File('${Directory.current.path}/.data/.tmp/${DateTime.now().microsecondsSinceEpoch}$_fileCounter')..createSync();
             _fileCounter += 1;
             _fileCounter %= 1000;
             Future(() async {