Reading blob using Azure function

Question

Hi Team,
I've written a Azure function in Python using VCC. I'm able to deploy and run the program in Azure portal. The problem I'm facing is to read the blob/and its content. I've used the http template of Azure function.

I'm using below code to read the content,

containerName = "test1"
        conn_str = ("BlobEndpoint=https://mydev.blob.core.windows.net/sandbox/test1/random?sp=r&st=2021-10-26T12:36:21Z&se=2021-10-26T20:36:21Z&spr=https&sv=2020-08-04&sr=b&sig=M1WCxkqcHdzRaFjkJOZmbU2%2Bj9yhQu416%2FkXaEYBCm0%3D")
        blob_service_client = BlobServiceClient.from_connection_string(conn_str)
        container_client = blob_service_client.get_container_client(containerName)
        blob_client=container_client.get_blob_client("random")
        stream_loader = blob_client.download_blob()

        filereader = json.loads(stream_loader.readall)
        a_file = open("fileReader.json","w")
        a_file = json.dump(filereader,a_file)
        with open("fileReader.json", 'r',encoding='utf-8-sig') as f:
                data = json.load(f)

blob_list = container_client.list_blobs()
        for blob in blob_list:
            print("\t" + blob.name)
            with open("fileReader.json", 'r',encoding='utf-8-sig') as f:
                data = json.load(f)

The connection string I'm using above is created using "Generate SAS" option. Please correct if this is not the right approach.

Also when I run this I get below error,

2021-10-26T12:40:05Z   [Information]   CORS policy execution failed.
2021-10-26T12:40:05Z   [Information]   Request origin https://functions.azure.com does not have permission to access the resource.

Could you please help me in getting the things right.

Thanks,
Raja

Answer 1

Can you please check if there are any CORS policies set on the storage account you are trying to access?