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POChecking for expiration and renewing auth session (pythonic way)
 

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    <p>A complete python newbie here, so don't shout at me :D</p> <p>I'm communicating with an online service and some questions popped up. :)</p> <p>The errors returned by the service are: <code>{"error" : {"code" : 1, "message" : "Descriptive message."}}</code> The sessions last for about 6 hours, so i really want to cache my session and reuse it, because in those 6 hours i can make hundreds of requests and it will be rude to reauth on every one.</p> <p>So this script works, but i don't like the big execution bit at the end.</p> <pre><code>import requests session_file = 'session' url = 'service.com/articles/get' api_key = 'my_api_key_goes_here' class MyException(Exception): pass def load_session(session_file): f = open(session_file, 'r') session = f.read() f.close return session def make_post(session, parameters): post_data = json.dumps({"jsonrpc":"2.0", "session_id":session, "params":parameters}) return post_data def get_article(article_id): session = load_session(session_file) post_data = (session, article_id) result = requests.post(url, post_data) if 'error' in result: raise MyException(result['error']) else: return result for attempt in range(2): try: article = get_article(123) print(article) break except MyException as e: if e.args[0]['code'] == 1: print('Session expired, renewing') login(api_key) #login function omitted for clarity #it also writes the session string to a file else: print(e) #something else happened (for example 'no such article') break else: break </code></pre> <p>Is there a way to do this better?</p> <p>It's possible to move the check and renewal in the function itself. And the execution at the end will be just:</p> <pre><code>try: article = get_article(123) print(article) except MyException as e: print(e) </code></pre> <p>My issue with this is that i have a bunch of other functions that communicate with the api and then i'll have to bloat every one of them with this check.</p> <p>Maybe the check can be made into a function (i can't figure out how)?</p> <p>Thanks!</p> <p>P.S. In the future i plan to move the functions to another file, and just import them. I also have some questions on this part, but i'll post into a new question later :)</p>
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