Alert on DAO proposals closing soon

import json, urllib.request
from datetime import datetime, timezone

API = "https://api.alphaday.com/items/dao/"
CLOSING_WITHIN_HOURS = 72

def fetch(limit=100):
    with urllib.request.urlopen(f"{API}?limit={limit}") as r:
        return json.load(r)["results"]

def closing_soon(proposals):
    now = datetime.now(timezone.utc)
    out = []
    for p in proposals:
        starts = datetime.fromisoformat(p["starts_at"].replace("Z", "+00:00"))
        ends = datetime.fromisoformat(p["ends_at"].replace("Z", "+00:00"))
        if not (starts <= now <= ends):
            continue
        hours_left = (ends - now).total_seconds() / 3600
        if hours_left <= CLOSING_WITHIN_HOURS:
            out.append((hours_left, p))
    # Sort on the number alone. A bare sorted() falls through to comparing the
    # dicts whenever two proposals share a deadline, and then it raises.
    return sorted(out, key=lambda pair: pair[0])

for hours, p in closing_soon(fetch()):
    print(f"{hours:5.1f}h left  {p['source']['name']:<14} {p['title'][:52]}")

0 * * * * /usr/bin/python3 /opt/alerts/dao_alerts.py