Text back missed callers and post a call-back note in Slack

from twilio.rest import Client
from datetime import datetime
from clickruntime import on_event, credentials, http, notify, state

FROM = "+15005550006"

def sms(to, body):
    return Client(credentials.secret("TWILIO_ACCOUNT_SID"), credentials.secret("TWILIO_AUTH_TOKEN")).messages.create(to=to, from_=FROM, body=body)

@on_event
def handle(event):
    f = event.json or {}
    if f.get("CallStatus") not in ("no-answer", "busy"):
        return {"skipped": f.get("CallStatus")}
    caller = f.get("From", "unknown")
    try:
        sms(caller, "Sorry we missed your call. We'll ring you back shortly.")
    except Exception:
        pass
    state.increment_metric("missed_calls", ttl_days=30)
    today = sum(b["value"] for b in state.query_metric("missed_calls", bucket="day")[-1:])
    notify.slack(f":telephone: Missed call from {caller} at {datetime.now():%H:%M}. Please call back. ({today} missed today)", channel="#calls")
    return {"caller": caller}