topic Rendering Volumes file content programmatically in Data Engineering

Rendering Volumes file content programmatically

lauraxyz — Fri, 22 Nov 2024 18:47:22 GMT

Hi there!

I have some files stored in Volume, and I have a use case that I need to show the file content in a UI. Say I have a REST API that already knows the Volume path to the file, is there any built-in feature from Databricks that i can use to help get the content?

one of the limitations Unity Catalog Volumes has is: "The DBFS endpoint for the REST API does not support volumes paths.", what does this imply to my use case?

Thank you!

Re: Rendering Volumes file content programmatically

cgrant — Fri, 22 Nov 2024 21:30:57 GMT

Hi @lauraxyz here is an example using the Databricks SDK in Python:

from databricks.sdk import WorkspaceClient ws = WorkspaceClient() image_path = '/Volumes/catalog/schema/volume/filename.jpg' image_data = ( ws.files.download(image_path) # download file .contents # pull out streamed response .read() # materialize bytes )

From here, you can do whatever you like with the image bytes. For example:

from PIL import Image from io import BytesIO image = Image.open(BytesIO(image_data)) # open the image with pillow image.show() #

If using a different language, we can always use the REST API directly, here is a quick Javascript example that uses the REST API (/api/2.0/fs/files):

// Set up API endpoint and headers const host = "https://..."; // Replace with your workspace URL, leaving the end slash off const token = "dapi..."; // Replace with your actual Databricks access token const imagePath = '/Volumes/catalog/schema/volume/filename.jpg'; // Download image using REST API fetch(`${host}/api/2.0/fs/files${imagePath}`, { headers: { 'Authorization': `Bearer ${token}` } }) .then(response => response.blob()) .then(blob => { const img = document.createElement('img'); img.src=URL.createObjectURL(blob); document.body.appendChild(img); }) .catch(error => console.error('Error:', error));

Re: Rendering Volumes file content programmatically

lauraxyz — Mon, 25 Nov 2024 20:18:06 GMT

Thank you @cgrant this is very helpful!

Another related question: if I want to accept user input from a UI and save that into a Volume, how should I do that? I'm referring this Databricks API doc but it is only to update volume metadata instead of volume files.

Re: Rendering Volumes file content programmatically

cgrant — Mon, 25 Nov 2024 20:30:34 GMT

Hi @lauraxyz, the files API should be helpful, particularly the upload endpoint.