slack-bot-scheduled-message-example.py

from datetime import date, datetime, time
import logging
import os

from slack_sdk import WebClient
from slack_sdk.errors import SlackApiError

STOIC_CHANNEL = os.environ["STOIC_CHANNEL"]
SLACK_BOT_TOKEN = os.environ["SLACK_BOT_TOKEN"]
THIS_YEAR = date.today().year
DAILY_STOIC_POST_TIME = {"hour": 6, "minute": 0}  # UTC = 8 am CET

client = WebClient(token=SLACK_BOT_TOKEN)
logger = logging.getLogger(__name__)


def _get_date_ordinal(day):
    """https://stackoverflow.com/a/5891598"""
    day = int(day)
    if 4 <= day <= 20 or 24 <= day <= 30:
        suffix = "th"
    else:
        suffix = ["st", "nd", "rd"][day % 10 - 1]
    return f"{day}{suffix}"


def schedule_post(entry):
    day_key = entry["key"]
    title = entry["title"]

    post_day = datetime.strptime(day_key, "%B_%d").replace(year=THIS_YEAR)
    scheduled_time = time(**DAILY_STOIC_POST_TIME)
    schedule_timestamp = datetime.combine(post_day, scheduled_time).strftime("%s")

    month, day = day_key.split("_")
    day_str = _get_date_ordinal(day)

    text = f"{month} {day_str}: {title.capitalize()} 🧵"
    try:
        result = client.chat_scheduleMessage(
            channel=STOIC_CHANNEL, text=text, post_at=schedule_timestamp
        )
        print("Schdule post result:", result)
        logger.info(result)
    except SlackApiError as e:
        logger.error(f"Error scheduling message: {e}")