app.py

#!/usr/bin/env python
# -*- coding: utf-8 -*-

from __future__ import print_function

import os
import sys
import subprocess
from flask import Flask, render_template
from sh import git

app = Flask(__name__)

version = git("rev-parse", "--short", "HEAD").strip()
command = os.getenv("HEATLAMP_SCRIPT")


def validate():
    """
    Validate the application configuration before launching.
    """

    missing = []
    if not command:
        missing.append((
            "HEATLAMP_SCRIPT",
            "The shell script to execute when a webhook is triggered."
        ))

    if missing:
        print("Missing required configuration values:\n", file=sys.stderr)
        for envvar, purpose in missing:
            print(" {}: {}".format(envvar, purpose), file=sys.stderr)
        print(file=sys.stderr)
        sys.exit(1)

validate()


@app.route("/", methods=["GET"])
def status():
    """
    Status check. Display the current version of heatlamp, some basic
    diagnostics, and a simple form that may be used to manually trigger
    a deployment.
    """

    return render_template("status.html", version=version)


@app.route("/", methods=["POST", "PUT"])
def refresh():
    """
    Webhook accepted. Perform the configured action.
    """

    status = subprocess.call(["/bin/bash", command])

    if status == 0:
        return "success", 200
    else:
        return "failure", 500

if __name__ == "__main__":
    app.run(host='0.0.0.0', port=10100)