Storage Writer

This guide shows you how to work with Azure Functions locally using Azurite, Docker Compose, and Python. This lab demonstrates how to create an HTTP-triggered function that uploads files to Azurite blob storage.

Prerequisites

Docker installed and running.
Dev Containers extension installed (optional).

How to execute

Setup Environment:
- Dev Container (recommended)
- Manually
Open VS Code in the project folder and execute this command in the Command Palette:
Terminal window
> Dev Containers: Reopen in Container
1. Install Azure Functions Core Tools: Follow the official installation guide.
2. Install dependencies:
  Terminal window
  pip3 install uv && uv sync
Start Infrastructure: Launch the Azurite container:
Terminal window
```
docker compose up -d
```
Start Function Host:
Terminal window
```
func start --prefix ./upload-function/
```
Run the Example:
Terminal window
```
python main.py
```

Validate results

Check using Azure Storage extension:

Open: Open the Azure view in VS Code (Azure icon in the sidebar).
Connect: Under Storage Accounts, click Attach Storage Account > Attach to a local emulator.
Browse: Use the default Azurite connection settings to browse your containers and blobs visually.

Clean Up

docker compose down -v

Troubleshooting

Issue	Solution
Connection Refused	Ensure Azurite is running: `docker ps`
Module Not Found	Reinstall function dependencies: `cd upload-function && pip install -r requirements.txt`