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engelkeTakashi Matsuo
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Takashi Matsuo
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feat(appengine): Pub/Sub sample for both Python 2.7 and 3 (GoogleCloudPlatform#4489)
* Make sample work in both Python 2.7 and 3 environments * Lint fix Co-authored-by: Takashi Matsuo <[email protected]>
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‎appengine/standard_python3/pubsub/README.md

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# Python 3 Google Cloud Pub/Sub sample for Google App Engine Standard Environment
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# Python Google Cloud Pub/Sub sample for Google App Engine Standard Environment
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[![Open in Cloud Shell][shell_img]][shell_link]
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[shell_img]: http://gstatic.com/cloudssh/images/open-btn.png
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[shell_link]: https://console.cloud.google.com/cloudshell/open?git_repo=https://github.com/GoogleCloudPlatform/python-docs-samples&page=editor&open_in_editor=appengine/standard/pubsub/README.md
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This demonstrates how to send and receive messages using [Google Cloud Pub/Sub](https://cloud.google.com/pubsub) on [Google App Engine Standard Environment](https://cloud.google.com/appengine/docs/standard/).
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This demonstrates how to send and receive messages using [Google Cloud Pub/Sub](https://cloud.google.com/pubsub) on [Google App Engine Standard Environment](https://cloud.google.com/appengine/docs/standard/) for
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Python 2.7 or for Python 3. See instructions below for deploying in either
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of those two environments.
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## Setup
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--push-auth-service-account=[your-service-account] \
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--push-auth-token-audience=example.com
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1. Update the environment variables in ``app.yaml``.
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1. Update the environment variables in ``app.yaml`` for Python 3, or ``app27.yaml`` for Python 2.7.
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## Running locally
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Note: Not all the files in the current directory are needed to run your code on App Engine. Specifically, `main_test.py` and the `data` directory, which contains a mocked private key file and a mocked public certs file, are for testing purposes only. They SHOULD NOT be included when deploying your app. When your app is up and running, Cloud Pub/Sub's push servers create tokens using a private key, then the Google Auth Python library takes care of verifying and decoding the token using Google's public certs, to confirm that the push requests indeed come from Cloud Pub/Sub.
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In the current directory, deploy using `gcloud`:
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In the current directory, deploy using `gcloud`. For Python 2.7 you must first
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install the required libraries in the `lib` folder:
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$ gcloud app deploy app.yaml
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$ pip -t lib -r requirements.txt
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$ gcloud app deploy app27.yaml
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You can now access the application at `https://[your-app-id].appspot.com`. You can use the form to submit messages, but it's non-deterministic which instance of your application will receive the notification. You can send multiple messages and refresh the page to see the received message.
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For Python 3, you can simply run the deploy command:
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$ gcloud app deploy app27.yaml
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You can now access the application using the `gcloud app browse` command. You
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can use the form to submit messages, but it's non-deterministic which instance
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of your application will receive the notification. You can send multiple
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messages and refresh the page to see the received message.

‎appengine/standard_python3/pubsub/app.yaml

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#[START env]
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env_variables:
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PUBSUB_TOPIC: your-topic
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# This token is used to verify that requests originate from your
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# application. It can be any sufficiently random string.
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PUBSUB_VERIFICATION_TOKEN: 1234abc
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PUBSUB_TOPIC: '<YOUR_TOPIC>'
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# This token is used to verify that requests originate from your
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# application. It can be any sufficiently random string.
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PUBSUB_VERIFICATION_TOKEN: '<YOUR_VERIFICATION_TOKEN>'
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#[END env]

‎appengine/standard_python3/pubsub/app27.yaml

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runtime: python27
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api_version: 1
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threadsafe: yes
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handlers:
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- url: .*
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script: main.app
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libraries:
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- name: setuptools
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version: 36.6.0
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- name: grpcio
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version: 1.0.0
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- name: ssl
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version: latest
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env_variables:
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PUBSUB_TOPIC: '<YOUR_TOPIC>'
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PUBSUB_VERIFICATION_TOKEN: '<YOUR_VERIFICATION_TOKEN>'
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GOOGLE_CLOUD_PROJECT: '<YOUR_PROJECT_ID>'

‎appengine/standard_python3/pubsub/appengine_config.py

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from google.appengine.ext import vendor
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import pkg_resources
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# Set path to your libraries folder.
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path = 'lib'
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# Add libraries installed in the path folder.
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vendor.add(path)
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# Add libraries to pkg_resources working set to find the distribution.
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pkg_resources.working_set.add_entry(path)

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