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README.md

Google Cloud Function Cloud Storage Copy Python example

This folder contains a Google Cloud Function example in Python on Google Cloud Platform (GCP).

It handles a Google Cloud Function that copies an object when it appears in a Cloud Storage bucket to another Cloud Storage bucket.

Requirements

  • You must have a Google Cloud Platform (GCP) account.

  • The code was written for:

    • Python 3
    • Google API Python Client Library

  • Dependencies in Python are managed with pip and expressed in a metadata file called requirements.txt shipped alongside your function.

    This requirements.txt file must be in the same directory as the main.py file that contains your function code.

    The requirements.txt file contains one line per library. Each line contains the package name, and optionally, the requested version.

    In order to use the Google Cloud Python Client Library, the file needs to include this dependency:

    google-cloud-storage==1.12.0

Using the code

  • Access the Google Cloud console.

  • Create a Cloud Storage bucket for the source and another Cloud Storage bucket for the target.

  • Create a Google Cloud Function:

    • Name: <CLOUD_FUNCTION_NAME>
    • Memory allocated: 256 MB
    • Trigger: Cloud Storage
    • Event Type: Finalise/Create
    • Bucket: <BUCKET_NAME>
    • Source code. You can use 2 options:
      • Inline editor: Edit the code of the main.py and requirements.txt files in the browser.
      • ZIP upload: Upload a ZIP file containing the main.py and requirements.txt files.
        • ZIP file: <ZIP_LOCAL_NAME>
        • Stage bucket: <BUCKET_NAME_FOR_STAGGING>
    • Runtime: Python 3.7 (Beta)
    • Function to execute: gcs_copy
    • Region: <GOOGLE_CLOUD_REGION>
    • Timeout: 60 seconds

  • You can select the destination bucket name changing the value of DESTINATION_BUCKET variable in the code.

  • Save the Google Cloud Function.

    The function is deployed and run.

  • Test the function.

    Copy a file in the source Cloud Storage bucket.

    The object from the source Cloud Storage bucket should be copied to the target Cloud Storage bucket.