main.py

# Copyright 2020 Google, LLC.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#    http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

# [START eventarc_pubsub_server]
import base64
import os

from flask import Flask, request


app = Flask(__name__)
# [END eventarc_pubsub_server]


# [START eventarc_pubsub_handler]
@app.route("/", methods=["POST"])
def index():
    data = request.get_json()
    if not data:
        msg = "no Pub/Sub message received"
        print(f"error: {msg}")
        return f"Bad Request: {msg}", 400

    if not isinstance(data, dict) or "message" not in data:
        msg = "invalid Pub/Sub message format"
        print(f"error: {msg}")
        return f"Bad Request: {msg}", 400

    pubsub_message = data["message"]

    name = "World"
    if isinstance(pubsub_message, dict) and "data" in pubsub_message:
        name = base64.b64decode(pubsub_message["data"]).decode("utf-8").strip()

    resp = f"Hello, {name}! ID: {request.headers.get('ce-id')}"
    print(resp)

    return (resp, 200)


# [END eventarc_pubsub_handler]


# [START eventarc_pubsub_server]
if __name__ == "__main__":
    app.run(debug=True, host="0.0.0.0", port=int(os.environ.get("PORT", 8080)))
# [END eventarc_pubsub_server]