Refactor handling of files in SourceCodeEventHandler

src/event_handlers/source_code_event_handler.py

@@ -1,58 +1,81 @@
 from shutil import copy, rmtree, copytree
-from os.path import splitext
+from os.path import splitext, isfile, join
+from glob import glob
 
 from tfw.util import SupervisorMixin
 from tfw.config import LOGIN_APP_DIR
 from tfw.event_handler_base import EventHandlerBase
 
+from tfw.config.logs import logging
+log = logging.getLogger(__name__)
+
+
+class FileManager:
+    def __init__(self, source_directory, working_directory, selected_file=None):
+        self._sourcedir = source_directory
+        self._workdir = working_directory
+        self._reload_files()
+        self.filename = selected_file or self.files[0]
+        self.language = map_file_extension_to_language(self.filename)
+
+    def select_file(self, filename):
+        if not filename in self.files:
+            raise EnvironmentError('No such file in workdir!')
+        self.filename = filename
+        self.language = map_file_extension_to_language(self.filename)
+
+    @property
+    def files(self):
+        return [file for file in glob(self._workdir) if isfile(file)]
+
+    @property
+    def file_contents(self):
+        with open(self._filepath(self.filename), 'r') as ifile:
+            return ifile.read()
+
+    @file_contents.setter
+    def file_contents(self, value):
+        with open(self._filepath(self.filename), 'w') as ofile:
+            ofile.write(value)
+
+    def _filepath(self, filename):
+        return join(self._workdir, filename)
+
+    def _reload_files(self):
+        rmtree(self._workdir, ignore_errors=True)
+        copytree(self._sourcedir, self._workdir)
+
 
 class SourceCodeEventHandler(EventHandlerBase, SupervisorMixin):
     def __init__(self, anchor, filename, process_name=None):
         super().__init__(anchor)
-        self.working_directory = LOGIN_APP_DIR
-        self.filename = filename
-        self.language = map_file_extension_to_language(filename)
+        self.filemanager = FileManager('login_projectdir', LOGIN_APP_DIR, selected_file=filename)
         self.process_name = process_name or splitext(filename)[0]
         self.commands = {
-            'read': self.read_file,
-            'write': self.write_file
+            'read': self.read,
+            'write': self.write
         }
 
-        self.file = self.create_initial_state()
+        # Supervisor needs these to run the login program
+        copy('source_code_server/server.py', LOGIN_APP_DIR)
+        copy('source_code_server/users.db', LOGIN_APP_DIR)
+
+    def read(self, data_json):
+        data_json['data'] = {
+            'filename': self.filemanager.filename,
+            'content': self.filemanager.file_contents,
+            'language': self.filemanager.language
+        }
+
+    def write(self, data_json):
+        self.filemanager.file_contents = data_json['data']['content']
+        self.restart_process()
 
     def handle_event(self, anchor, data_json):
         data = data_json['data']
         self.commands[data['command']](data_json)
         return data_json
 
-    def handle_reset(self, data_json):
-        self.create_initial_state()
-
-    def read_file(self, data_json):
-        with open(self.file, 'r') as ifile:
-            content = ifile.read()
-        data_json['data'] = {
-            'filename': self.filename,
-            'content': content,
-            'language': self.language
-        }
-
-    def write_file(self, data_json):
-        data = data_json['data']
-        with open(self.file, 'w') as ofile:
-            ofile.write(data['content'])
-        self.restart_process()
-
-    def create_initial_state(self):
-        self.stop_process()
-
-        rmtree(self.working_directory, ignore_errors=True)
-        copytree('source_code_server/', self.working_directory)
-        file = copy(self.filename, self.working_directory)
-
-        self.start_process()
-        return file
-
 
 def map_file_extension_to_language(filename):
     language_map = {