Google Cloud Functions is a serverless execution environment for building and connecting cloud services. With Cloud Functions you write simple, single-purpose functions that are attached to events emitted from your cloud infrastructure and services. Your function is triggered when an event being watched is fired.
This page shows you how to create and deploy a Python Cloud Function using the GCP Console. When this function is triggered by an HTTP request, it writes a message:
def hello_world(request):
"""Responds to any HTTP request.
Args:
request (flask.Request): HTTP request object.
Returns:
The response text or any set of values that can be turned into a
Response object using
`make_response <http://flask.pocoo.org/docs/1.0/api/#flask.Flask.make_response>`.
"""
request_json = request.get_json()
if request.args and 'message' in request.args:
return request.args.get('message')
elif request_json and 'message' in request_json:
return request_json['message']
else:
return f'Hello World!'
Before you begin
-
Sign in to your Google Account.
If you don't already have one, sign up for a new account.
-
Select or create a GCP project.
-
Make sure that billing is enabled for your Google Cloud Platform project. Learn how to enable billing.
- Enable the Cloud Functions API.
Create a function
Open the Functions Overview page in the GCP Console:
Go to the Cloud Functions Overview page
Make sure that the project for which you enabled Cloud Functions is selected.
Click Create function.
Name your function.
In the Trigger field, select HTTP.
In the Source code field, select Inline editor. In this exercise, you will use the default function provided in the editor.
Use the Runtime dropdown to select the Python runtime.
Your display should resemble the following:
Deploy the function
At the bottom of the page, click Create.
After clicking Create, GCP Console redirects to the Cloud Functions Overview page.
While the function is being deployed, the icon next to it is a small spinner. After it finishes deploying, the spinner turns to a green check mark:
Test the function
Display the menu for your function, and click Test function.
On the testing page, click Test the function.
The Output screen displays the text
"Hello World!"Now change the message. In the Triggering Event field, enter the text
{"message":"Hello, YOUR_NAME!"}, replacingYOUR_NAMEwith a name, and click Test the function.For example, suppose you entered the name "Rowan". In the Output field, you would see the message
Hello, Rowan!.In the Logs field, a status code of 200 indicates success.
View logs
Check the logs to see your actions in the log history:
- Back on the Cloud Functions Overview page, display the menu for your function, and click View logs.
Your log history appears.
