Azure Functions Bindings & Triggers - Blob Storage

Understanding Blob Storage Triggers

Blob Storage triggers in Azure Functions allow your function to automatically execute when events occur in your Blob Storage account, such as a new blob being uploaded, a blob being deleted, or a blob being modified.

These triggers can be configured using the Azure portal, Azure CLI, or Infrastructure as Code (e.g., ARM templates).

Key Bindings

Several bindings are commonly used with Blob Storage triggers:

• blobTrigger: This binding specifies the name of the Blob Storage container that your function will listen to.
• connectionString: This binding contains the connection string to your Azure Storage account.
• blobName: This binding allows you to filter events based on the name of the blob.
• blockSize: This binding allows you to configure the size of the block read when fetching blob data.

Example Function Structure

A basic Blob Storage trigger function might look like this (using JavaScript):

                
                    function myFunction(event) {
                        console.log("Triggered by: " + event.triggerName);
                        console.log("Blob Name: " + event.blobName);
                        console.log("Container Name: " + event.containerName);
                        // Your code here to process the blob
                    }