Get email and Discord alerts when a site goes down or a domain frees up

import base64
from email.message import EmailMessage
from google.oauth2.credentials import Credentials
from googleapiclient.discovery import build
from clickruntime import on_trigger, credentials, http, state

SITES, DOMAINS = ["https://example.com", "https://docs.example.com"], ["example.io"]
CHANNEL_ID, ME = "your-discord-channel-id", "you@example.com"

def check(target):
    if target in DOMAINS:
        return "taken" if http.get(f"https://rdap.org/domain/{target}", timeout=10).status_code == 200 else "available"
    try:
        return "up" if http.get(target, timeout=10).status_code < 500 else "down"
    except Exception:
        return "down"

@on_trigger
def run(event):
    last, alerts = state.get("last") or {}, []
    for t in SITES + DOMAINS:
        s = check(t)
        if t in last and last[t] != s:
            alerts.append(f"{t} is now {s}")
        last[t] = s
    if alerts:
        text, msg = "\n".join(alerts), EmailMessage()
        msg["To"], msg["Subject"] = ME, alerts[0]
        msg.set_content(text)
        gmail = build("gmail", "v1", credentials=Credentials(credentials.connection("google", "work")), cache_discovery=False)
        gmail.users().messages().send(userId="me", body={"raw": base64.urlsafe_b64encode(msg.as_bytes()).decode()}).execute()
        http.post(f"https://discord.com/api/v10/channels/{CHANNEL_ID}/messages", headers={"Authorization": f"Bot {credentials.secret('DISCORD_BOT_TOKEN')}"}, json={"content": text})
    state.set("last", last)
    return {"alerts": len(alerts)}