Interaction between Slack and Blink1.

slack-blink1.py

#!/usr/bin/env python3.6
# coding: utf-8

"""Interaction between Slack and Blink1.

Use the Slack Real Time Messaging API to analyze message and turn on the
Blink1 device.

Based on this great blog article :
https://www.fullstackpython.com/blog/build-first-slack-bot-python.html

In Slack, create an app with a bot.
Start this script and send message to the corresponding bot like this :

    @bot red
    @bot #00ff00
"""


import os
import time
import webcolors
from slackclient import SlackClient
from blink1.blink1 import Blink1


# Define SLACK_BOT_ID and SLACK_BOT_TOKEN environnement varible.
BOT_ID = os.environ.get('SLACK_BOT_ID')
TOKEN = os.environ.get('SLACK_BOT_TOKEN')
AT_BOT = f"<@{BOT_ID}>"


# Init
sc = SlackClient(TOKEN)
b = Blink1()


def parse_slack_output(outputs):
    """The Slack Real Time Messaging API is an events firehose.
    this parsing function returns None unless a message is
    directed at the Bot, based on its ID.
    """
    if outputs and len(outputs) > 0:
        for output in outputs:
            if output and 'text' in output and AT_BOT in output['text']:
                # return text after the @ mention and channel
                return (output['text'].split(AT_BOT)[1].strip().lower(),
                        output['channel'])
    return None, None


def send_message(message, channel):
    """Send a message in Slack."""
    sc.api_call("chat.postMessage", channel=channel, text=message,
                 as_user=True)


def handle_blink(color, channel):
    """Handle command."""
    # Is it a name of a hex ?
    if color in webcolors.CSS3_NAMES_TO_HEX:
        b.fade_to_color(200, color)
        send_message("ok", channel)
        return True

    else:
        if '#' in color and len(color) == 7:
            rgb = webcolors.hex_to_rgb(color)
            b.fade_to_rgb(200, *rgb)
            send_message("ok", channel)
            return True

        elif '#' not in color and len(color) == 6:
            rgb = webcolors.hex_to_rgb(f'#{color}')
            b.fade_to_rgb(200, *rgb)
            send_message("ok", channel)
            return True

    send_message("I do not understand the color.", channel)
    print(f"Cannot understand color '{color}'")
    return False


def main():
    """Main."""
    if sc.rtm_connect():
        print("Ready!")
        while True:
            color, channel = parse_slack_output(sc.rtm_read())
            if color and channel:
                handle_blink(color, channel)
            time.sleep(1)

    else:
        print("Connection Failed")


if __name__ == '__main__':
    main()