change scope of tokens to global constants, obtained from env vars

main.py

@@ -1,5 +1,5 @@
+import os
 from asyncio import Condition, Lock, create_task, shield, to_thread, wait_for
-from os import getenv
 
 import requests
 from discord import Game, Intents, Interaction, app_commands
@@ -8,6 +8,8 @@ from discord.ext import commands
 from PICable import PICable
 
 MAX_STORAGE_KB = 50 * 1024 * 1024  # 50GB
+DISCORD_TOKEN = os.getenv("PICABLE_DISCORD_TOKEN")
+GITHUB_TOKEN = os.getenv("PICABLE_GITHUB_TOKEN")
 
 if __name__ == "__main__":
     current_storage_kb = 0
@@ -15,17 +17,14 @@ if __name__ == "__main__":
     current_repositories = set()
     current_repositories_lock = Lock()
 
-    discord_token = getenv("PICABLE_DISCORD_TOKEN")
-    github_token = getenv("PICABLE_GITHUB_TOKEN")
-
-    if not discord_token or not github_token:
+    if not DISCORD_TOKEN or not GITHUB_TOKEN:
         print("Discord or Github tokens not set in env. Use variables PICABLE_DISCORD_TOKEN and PICABLE_GITHUB_TOKEN")
         exit(1)
 
     intents = Intents.default()
     intents.message_content = True
     client = commands.Bot(command_prefix="/", intents=intents)
-    client.run(discord_token)
+    client.run(DISCORD_TOKEN)
 
     @client.event
     async def on_ready():
@@ -67,7 +66,7 @@ if __name__ == "__main__":
             current_repositories.add(repository_full_name)
 
         url = f"https://api.github.com/repos/{owner}/{repository}"
-        headers = {"Authorization": f"token {github_token}"}
+        headers = {"Authorization": f"token {GITHUB_TOKEN}"}
         response = requests.get(url, headers=headers)
 
         if not response.status_code == 200:
@@ -90,7 +89,7 @@ if __name__ == "__main__":
 
         global current_storage_kb
         try:
-            result_future = create_task(handle_picable(owner, repository, repository_size_kb, github_token))
+            result_future = create_task(handle_picable(owner, repository, repository_size_kb, GITHUB_TOKEN))
             try:
                 result = await wait_for(shield(result_future), timeout=600)
                 await interaction.followup.send(result)