improve Dockerfile and bug fixes

Dockerfile

@@ -1,14 +1,14 @@
 FROM python:3.9-alpine
 
-RUN apt-get update && \
-    apt-get install ffmpeg -y && \
-    rm -rf /var/lib/apt/lists/*
+ENV PYTHONFAULTHANDLER=1 \
+     PYTHONUNBUFFERED=1 \
+     PYTHONDONTWRITEBYTECODE=1 \
+     PIP_DISABLE_PIP_VERSION_CHECK=on
 
-RUN useradd -m appuser
-USER appuser
-WORKDIR /home/appuser/app
+RUN apk --no-cache add ffmpeg
 
-COPY --chown=appuser . .
+WORKDIR /app
+COPY . .
 RUN pip install -r requirements.txt --no-cache-dir
 
 CMD ["python", "bot/main.py"]

bot/openai_helper.py

@@ -28,7 +28,7 @@ class OpenAIHelper:
         Gets a response from the GPT-3 model.
         :param chat_id: The chat ID
         :param query: The query to send to the model
-        :return: The answer from the model and the number of tokens used
+        :return: The answer from the model and the number of tokens used, or an error message
         """
         try:
             if chat_id not in self.conversations or self.__max_age_reached(chat_id):

bot/telegram_bot.py

@@ -214,7 +214,7 @@ class ChatGPT3TelegramBot:
 
             # add guest chat request to guest usage tracker
             allowed_user_ids = self.config['allowed_user_ids'].split(',')
-            if str(user_id) not in allowed_user_ids:
+            if str(user_id) not in allowed_user_ids and 'guests' in self.usage:
                 self.usage["guests"].add_transcription_seconds(audio_track.duration_seconds, transcription_price)
 
             if self.config['voice_reply_transcript']:
@@ -241,7 +241,7 @@ class ChatGPT3TelegramBot:
                 # add chat request to users usage tracker
                 self.usage[user_id].add_chat_tokens(total_tokens, self.config['token_price'])
                 # add guest chat request to guest usage tracker
-                if str(user_id) not in allowed_user_ids:
+                if str(user_id) not in allowed_user_ids and 'guests' in self.usage:
                     self.usage["guests"].add_chat_tokens(total_tokens, self.config['token_price'])
 
                 # Split into chunks of 4096 characters (Telegram's message limit)