text: # Copyright 2019 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 cloudrun_pubsub_server_setup]
  # [START run_pubsub_server_setup]
  import base64
  import os
  
  from flask import Flask, request
  
  
  app = Flask(__name__)
  # [END run_pubsub_server_setup]
  # [END cloudrun_pubsub_server_setup]
  
  
  # [START cloudrun_pubsub_handler]
  # [START run_pubsub_handler]
  @app.route("/", methods=["POST"])
  def index():
      envelope = request.get_json()
      if not envelope:
          msg = "no Pub/Sub message received"
          print(f"error: {msg}")
          return f"Bad Request: {msg}", 400
  
      if not isinstance(envelope, dict) or "message" not in envelope:
          msg = "invalid Pub/Sub message format"
          print(f"error: {msg}")
          return f"Bad Request: {msg}", 400
  
      pubsub_message = envelope["message"]
  
      name = "World"
      if isinstance(pubsub_message, dict) and "data" in pubsub_message:
          name = base64.b64decode(pubsub_message["data"]).decode("utf-8").strip()
  
      print(f"Hello {name}!")
  
      return ("", 204)
  
  
  # [END run_pubsub_handler]
  # [END cloudrun_pubsub_handler]
  
  
  if __name__ == "__main__":
      PORT = int(os.getenv("PORT")) if os.getenv("PORT") else 8080
  
      # This is used when running locally. Gunicorn is used to run the
      # application on Cloud Run. See entrypoint in Dockerfile.
      app.run(host="127.0.0.1", port=PORT, debug=True)
  