Exception binding blob in Azure Functions

1
votes

I'm following tutorial on http://martinabbott.azurewebsites.net/2016/06/11/fun-with-azure-functions-and-the-emotion-api/

I have Blob Trigger Storage container named "pictures" in integration tab. myblob path is "pictures/{name}" There are no input defined. Output is DocumentDB. I have verified that access key is correct.

I wonder what is reason for error? Connection problem to Azure Storage or cannot locate file for ?

Exception while executing function: Functions.BlobTriggerEmotionFunction. Microsoft.Azure.WebJobs.Host: Exception binding parameter 'myBlob'. Microsoft.WindowsAzure.Storage: The remote server returned an error: (404) Not Found.

1
azure-functions

1 Answers

3
votes

You are seeing this exception because the blob container named pictures cannot be found in the storage account used by your Function App. You have to create the blob container yourself as an out-of-band workflow. This will allow Azure Functions to listen for any upload activity on the blob container.

You may download the Azure Storage Explorer client to create/confirm that the blob container pictures was created for the storage account tied to your Function app. You can locate the storage account name and key by performing the following steps:

  1. Visit the Functions Portal (using latest Runtime version ~0.9) for your Function app.
  2. Click on Function app settings->Configure app settings.
  3. Locate the AzureWebJobsDashboard or AzureWebJobsStorage settings value (whichever you chose when you created the Function), and lookup the AccountName and AccountKey values.

A sample snapshot of a similar setup is shown below,

enter image description here

If the pictures container does not exist, you can use the Azure Storage Explorer client to create one. Make sure that you choose either the Public container, or Public blob option.

Thanks for sharing the tutorial. It works for me. I hope this helps!