Generic Azure Functions - Dynamic Connections

Question

I want to create and host a azure function that would take as input "azure-storage-account-name" and "path" and run some common logic and then return a list of processed blobs in that storage account at that path. I have 20 storage accounts and I was thinking to write single azure function in same subscription to have listing capability across all of them

I went through Azure function documentation couldn't figure out if this is even possible in current offering. Any pointers would be helpful

you also need a key to access the storage account unless you have made the folders public — viperguynaz
Any particular reason why you would do that using a function instead of the Azure Blog Storage - List Blobs ? You could also do it in a Function, using the Azure Storage Library nuget package. Keep in mind that you'll need to store the storage connection strings for each storage account as well then. — Steven Van Eycken
When you say path ? you mean filename or every file in a container or in specific folder ? — Thomas
Actually the idea is not only to list, but also delete the ones that are no longer needed. The logic is same for blobs across storage accounts. Hence, I need this functionality abstracted out so that its called for each storage account externally (say logic app) — Illuminati

Mikhail Shilkov Mikhail Shilkov · Accepted Answer · 2018-01-11T07:07:58

You can use Imperative Bindings feature of Azure Functions. This is a sample code:

public static async Task<HttpResponseMessage> Run(HttpRequestMessage req, Binder binder, TraceWriter log)
{
    var attributes = new Attribute[]
    {
        new StorageAccountAttribute("your account"),
        new BlobAttribute("your folder name")
    };

    var directory = await binder.BindAsync<CloudBlobDirectory>(attributes);
    log.Info(directory.ListBlobs().Count().ToString());

    return new HttpResponseMessage(HttpStatusCode.OK);
}

Generic Azure Functions - Dynamic Connections

2 Answers