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App Dev: Storing Image and Video Files in Cloud Storage - Python
GSP185
Overview
Cloud Storage allows world-wide storage and retrieval of any amount of data at any time. You can use Cloud Storage for a range of scenarios including serving website content, storing data for archival and disaster recovery, or distributing large data objects to users via direct download.
In this lab you'll configure an application to use Cloud Storage to store and retrieve application data. The application is an online Quiz, the data is the form data, including an image you upload from your local machine.
Objectives
In this lab, you learn how to perform the following tasks:
- Set up Cloud Shell as your development environment
- Update the application code to integrate Cloud Datastore
- Use the Quiz application to upload an image file into Cloud Storage and view the image in the Quiz
Setup and requirements
Before you click the Start Lab button
Read these instructions. Labs are timed and you cannot pause them. The timer, which starts when you click Start Lab, shows how long Google Cloud resources will be made available to you.
This hands-on lab lets you do the lab activities yourself in a real cloud environment, not in a simulation or demo environment. It does so by giving you new, temporary credentials that you use to sign in and access Google Cloud for the duration of the lab.
To complete this lab, you need:
- Access to a standard internet browser (Chrome browser recommended).
- Time to complete the lab---remember, once you start, you cannot pause a lab.
How to start your lab and sign in to the Google Cloud console
-
Click the Start Lab button. If you need to pay for the lab, a pop-up opens for you to select your payment method. On the left is the Lab Details panel with the following:
- The Open Google Cloud console button
- Time remaining
- The temporary credentials that you must use for this lab
- Other information, if needed, to step through this lab
-
Click Open Google Cloud console (or right-click and select Open Link in Incognito Window if you are running the Chrome browser).
The lab spins up resources, and then opens another tab that shows the Sign in page.
Tip: Arrange the tabs in separate windows, side-by-side.
Note: If you see the Choose an account dialog, click Use Another Account. -
If necessary, copy the Username below and paste it into the Sign in dialog.
{{{user_0.username | "Username"}}} You can also find the Username in the Lab Details panel.
-
Click Next.
-
Copy the Password below and paste it into the Welcome dialog.
{{{user_0.password | "Password"}}} You can also find the Password in the Lab Details panel.
-
Click Next.
Important: You must use the credentials the lab provides you. Do not use your Google Cloud account credentials. Note: Using your own Google Cloud account for this lab may incur extra charges. -
Click through the subsequent pages:
- Accept the terms and conditions.
- Do not add recovery options or two-factor authentication (because this is a temporary account).
- Do not sign up for free trials.
After a few moments, the Google Cloud console opens in this tab.
Activate Cloud Shell
Cloud Shell is a virtual machine that is loaded with development tools. It offers a persistent 5GB home directory and runs on the Google Cloud. Cloud Shell provides command-line access to your Google Cloud resources.
- Click Activate Cloud Shell
at the top of the Google Cloud console.
When you are connected, you are already authenticated, and the project is set to your Project_ID,
gcloud
is the command-line tool for Google Cloud. It comes pre-installed on Cloud Shell and supports tab-completion.
- (Optional) You can list the active account name with this command:
- Click Authorize.
Output:
- (Optional) You can list the project ID with this command:
Output:
gcloud
, in Google Cloud, refer to the gcloud CLI overview guide.
Launch the Cloud Shell code editor
- From Cloud Shell, click Open Editor to launch the code editor.
- Run the following command to configure your Project ID, replacing
YOUR-PROJECT-ID
with your Project ID:
Task 1. Prepare the quiz application
In this section, you access Cloud Shell, clone the git repository containing the Quiz application, and run the application.
Clone source code in Cloud Shell
- To clone the repository for the class, execute the following command:
Configure and run the quiz application
-
Change the working directory:
cd ~/training-data-analyst/courses/developingapps/python/cloudstorage/start -
Set the region using a variable:
REGION={{{project_0.default_region | REGION}}} sed -i s/us-central/$REGION/g prepare_environment.sh -
Configure the application:
. prepare_environment.sh Note: Ignore any warnings. This script file:
- Creates an App Engine application.
- Exports an environment variable,
GCLOUD_PROJECT
. - Updates pip, then runs
pip install -r requirements.txt
. - Creates entities in Cloud Datastore.
- Prints out the Project ID.
-
Run the application:
python run_server.py The application is running when you see the following output:
* Running on http://127.0.0.1:8080/ (Press CTRL+C to quit) * Restarting with stat * Debugger is active! * Debugger PIN: 502-577-323
Review the quiz application
-
To view the application, click Web preview > Preview on port 8080.
-
Click the Create Question link in the toolbar.
You should see a simple form that contains textboxes for the question and answers and radio buttons to select the correct answer
Task 2. Examine the quiz application code
In this section, you review the case study application code.
In this lab you'll view and edit files. You can use the shell editors that are installed on Cloud Shell, such as nano
or vim
or the Cloud Shell code editor.
This lab uses the Cloud Shell code editor to review the Quiz application code.
Examine the application code
-
Navigate to the
/training-data-analyst/courses/developingapps/python/cloudstorage/start
folder using the file browser panel on the left side of the editor. -
Select the
add.html
file in the...quiz/webapp/templates/
folder.This file contains the template for the Create Question form.
Notice how the form has been modified to use
multipart/form-data
as theenc-type
, and there are two new form controls:- A file upload control called
image
- A hidden field called
imageUrl
- A file upload control called
-
Select the
routes.py
file in the...quiz/webapp
folder.This file contains the route for the POST handler that receives the form data. It has been modified to get the image file from the form.
-
Select the
questions.py
file in the...quiz/webapp
folder.This file contains the handler that processes the form data extracted in the
routes.py
file. You will modify this file to use a new module that is a client for Cloud Storage. -
Select the
...quiz/gcp/storage.py
file.This is the file where you will write code to save image file data into Cloud Storage.
Task 3. Create a Cloud Storage Bucket
In this section, you create a Cloud Storage bucket and export an environment variable that references it.
-
Return to the Cloud Shell command line.
-
Stop the application by pressing Ctrl+C.
-
Create a Cloud Storage bucket named
<Project ID>-media
:gsutil mb gs://$DEVSHELL_PROJECT_ID-media You can create a bucket using the gsutil mb command, passing through the name of the bucket as gs://BUCKET_NAME
You can use $DEVSHELL_PROJECT_ID as the bucket name prefix followed by -media
-
To export the Cloud Storage bucket name as an environment variable named
GCLOUD_BUCKET
, execute the following command:
Click Check my progress to verify the objective.
Task 4. Adding objects to Cloud Storage
In this section, you write code to save uploaded files into Cloud Storage.
For information on API documentation for Cloud Storage, refer to the APIs and reference reference.
Import and use the Python Cloud Storage module
- In code editor, move to the top of the
...quiz/gcp/storage.py
file. - Get the bucket name from the
GCLOUD_BUCKET
environment variable. - Import the storage module from the
google.client
package. - Create a Cloud Storage client.
- Get a reference to the Cloud Storage bucket.
quiz/gcp/storage.py
Write code to send a file to Cloud Storage
- Still in
storage.py
, in the theupload_file(...)
function, remove the existing pass statement, then use the Cloud Storage client to upload a file to your Cloud Storage bucket and make it publicly available. - Get a reference to a Cloud Storage blob object in the bucket.
- Use the blob object to upload the image.
- Make the file public.
- Return the blob's public URL.
quiz/gcp/storage.py - upload)file(...)
function
- Save
storage.py
.
Write code to use the Cloud Storage functionality
- In the editor, move to the top of the
...quiz/webapp/questions.py
file. - Modify the import statement to use your storage client as well as the datastore client.
- Move to the
upload_file(...)
function. Use your storage client to upload a file, and assign the returned public URL to a variable. - Modify the return statement to return the public URL.
- Move to the
save_question(...)
function. Write an if test to see if theimage_file
is present. - If it is, then call the
upload_file(...)
function, and assign the public URL to a entity property named imageUrl. - If not, then assign an empty string to the entity imageUrl property.
quiz/webapp/questions.py
- Save
questions.py
.
Run the application and create a Cloud Storage object
- Save the
...gcp/storage.py
and...webapp/questions.py
files, and then return to the Cloud Shell command. - Return to Cloud Shell to run the application:
-
Download an image file to your local machine from Google storage.
-
In Cloud Shell, click Web preview > Preview on port 8080 to preview the Quiz application.
-
Click the Create Question link.
-
Complete the form with the following values, and then click Save.
Form Field Value Author Your name Quiz Google Cloud Platform
Title Which product does this logo relate to?
Image Upload the Google_Cloud_Storage_logo.png file you previously downloaded
Answer 1 App Engine
Answer 2 Cloud Storage
(Select the Answer 2 radio button)Answer 3 Compute Engine
Answer 4 Container Engine
-
Return to the Cloud Console and navigate to Navigation menu > Cloud Storage.
-
On the Cloud Storage > Browser page, click the correct bucket (named
<Project ID>-media
).
You should see your new object named Google_Cloud_Storage_logo.png
.
Run the client application and test the Cloud Storage public URL
-
Add
/api/quizzes/gcp
to the end of the application's URL.You should see that JSON data has been returned to the client corresponding to the Question you added in the web application.
The imageUrl property should have a value corresponding to the object in Cloud Storage.
-
Return to the application home page and click the Take Test link.
-
Click GCP, and answer each question.
When you get to the question you just added, you should see the image has been formatted inside the client-side web application!
Congratulations!
This concluded the lab, App Dev: Storing Image and Video Files in Cloud Storage - Python. You used Cloud Storage to store and retrieve application data.
Next steps / Learn more
-
See what else you can do with images and video:
-
Learn more about Python on the Google Cloud.
Manual last updated August 08, 2024
Lab last tested August 08, 2024
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