Get discourse topic from discourse.ubuntu.com

get-discourse-topic.py

#! /usr/bin/env python3

import json
import os
import sys
import time
import urllib.request


topic_id = sys.argv[1]
api_key = os.environ["UBUNTU_DISCOURSE_API_KEY"]
url = "https://discourse.ubuntu.com/t/{topic_id}.json?include_raw=true&api_key={api_key}&api_username=system".format(**locals())

response = None

while response is None or response.status == 429:
    if response is not None and response.status == 429:
        seconds = 5
        error_message = json.loads(response.read().decode())["errors"][0]
        seconds_match = re.search("wait (\d+) seconds", error_message)

        if seconds_match:
            seconds = int(seconds_match.groups()[0]) + 1

        print(
            "  > 429 from API, waiting {seconds} seconds ... "
            "('{error_message}')".format(**locals())
        )
        time.sleep(seconds)

    response = urllib.request.urlopen(url)

print(json.loads(response.read().decode())["post_stream"]["posts"][0]["raw"])