epub converter: prettify solver.py

src/solver.py

@@ -1,15 +1,23 @@
-""" This is Interface for solving a task of a book conversion"""
+""" This is Main Abstract class for solving a task of a book conversion
+
+Having an id of coming book, gets book from server, runs conversion.
+In parallel it updates status of a book conversion on admin panel.
+Finally sends result to server.
+Result is a json, JSON schema in book_schema.json
+"""
 
 import codecs
 import json
 import logging
 import os
 import pathlib
+from abc import abstractmethod, ABCMeta
 
 from livecarta_config import BookLogger, BookStatusWrapper, LawCartaConfig
 
 
 class BookSolver:
+    __metaclass__ = ABCMeta
 
     def __init__(self, book_id=0, access=None, main_logger=None, logging_format='%(asctime)s - %(levelname)s - %(message)s'):
         self.book_type = None
@@ -82,7 +90,7 @@ class BookSolver:
                 json.dump(content, f, ensure_ascii=False)
             self.logger_object.log(f'Data has been saved to .json file: {self.output_path}')
         except Exception as exc:
-            self.logger_object.log('Error has occurred while writing json file.'+ str(exc), logging.ERROR)
+            self.logger_object.log('Error has occurred while writing json file.' + str(exc), logging.ERROR)
 
     def send_json_content_to_server(self, content: dict):
         try:
@@ -94,6 +102,7 @@ class BookSolver:
             self.status_wrapper.set_error()
             raise exc
 
+    @abstractmethod
     def get_converted_book(self):
         self.logger_object.log('Beginning of processing json output.')
         self.status_wrapper.set_generating()
@@ -106,7 +115,7 @@ class BookSolver:
         folder_path = os.path.join(folder_path, f'{self.book_type}')
         file_path = os.path.join(folder_path, f'{self.book_id}.{self.book_type}')
         self.file_path = pathlib.Path(file_path)
-        self.logger_object.log(f'Test epub path: {self.file_path}')
+        self.logger_object.log(f'Test on {self.book_type}: {self.file_path}')
         content_dict = self.get_converted_book()
         self.write_to_json(content_dict)
         self.logger_object.log('End of the test.')