error out on slack error response

bot.py

@@ -3,6 +3,7 @@ import datetime
 import os
 import pathlib
 import time
+import sys
 
 import requests
 from selenium import webdriver
@@ -63,11 +64,18 @@ def filter_word(word, conditions):
 def slack_request(method, **kwargs):
     kwargs['headers'] = {'Authorization': 'Bearer ' + os.environ['SLACK_TOKEN']}
 
-    return requests.post(
+    r = requests.post(
         f'https://slack.com/api/{method}',
         **kwargs
     )
 
+    resp = r.json()
+    if not resp['ok']:
+        print('Slack API responded with error:')
+        print(resp)
+        sys.exit(1)
+    return resp
+
 
 class Solver:
     def __init__(self):
@@ -171,18 +179,12 @@ if __name__ == '__main__':
         lines = lines + [''.join(row) for row in result['history']]
         
         channel = os.environ['SLACK_CHANNEL']
-        r = slack_request('chat.postMessage', json={'channel': channel, 'text': '\n'.join(lines)})
-        msg = r.json()
-
-        if msg['ok']:
-            r = slack_request(
+        msg = slack_request('chat.postMessage', json={'channel': channel, 'text': '\n'.join(lines)})
+        slack_request(
             'files.upload',
             params={'thread_ts': msg['ts'], 'channels': channel},
             files={'file': (filename, open(filename, 'rb').read())},
         )
-        else:
-            print('Slack API responded with error:')
-            print(msg)
 
     else:
         print('Failed to find the word.')