Introduction

This document outlines the process of creating an Azure Function with a Blob trigger. This setup allows the Function to process files uploaded to a specific container within a Storage Account.

Table of Contents

• Introduction
• Architecture
• Prerequisites
• Steps to Create and Configure the Azure Function
  • 1. Create an Azure Function App
  • 2. Enable Application Insights
  • 3. Add a Blob Trigger Function
  • 4. Configure Blob Trigger Settings
  • 5. Test the Function
  • 6. Check Logs
• Conclusion

Architecture

The following diagram illustrates the architecture of the solution:

Figure 1: Solution Architecture

Prerequisites

Before you begin, ensure you have the following:

• An active Azure subscription.
• Access to the Azure Portal.
• A Storage Account created in Azure.

Steps to Create and Configure the Azure Function

Follow these steps to set up your Azure Function with a Blob trigger:

1. Create an Azure Function App

First, create a new Function App resource in the Azure portal.

2. Enable Application Insights

During the Function App creation or afterwards, remember to enable Application Insights for monitoring and logging.

3. Add a Blob Trigger Function

Once the Function App is created, navigate to it and add a new function. Select the Blob Trigger template.

Figure 2: Create Blob Trigger Function Page

4. Configure Blob Trigger Settings

When configuring the Blob Trigger:

• Container Name: Correctly set the name of the container in your Storage Account that the trigger will monitor.
• Path (File Name Pattern): Set the path to {file}. This configuration ensures that any file uploaded to the specified container will trigger the function.
• Storage Account Connection: Create a new Storage Account connection or select an existing one, pointing to the Storage Account containing your target blob container.

Important:

• Ensure the container name is accurately specified.
• Using {file} as the file name pattern allows the function to be triggered by any uploaded file in the container.
• Verify that the Storage Account connection string is correctly configured and has the necessary permissions.

5. Test the Function

Upload a file to the container you specified in the Blob Trigger configuration. This action should trigger the function.

6. Check Logs

You can monitor the function's execution and check for logs:

1. Navigate to your function in the Azure Portal.
2. Go to the Code + Test section.
3. In the console, switch the log view to Filesystem Logs to see the detailed execution logs.

Figure 3: Filesystem Logs View

Log Output Example: The logs will show entries indicating that the function was triggered by the blob upload and processed it.

Conclusion

As demonstrated, uploading a blob to the configured container successfully triggers the Azure Function, which then processes the blob. The execution logs can be easily accessed and reviewed through the Azure Portal.