How to get the Azure Blob Uri from Azure Functions with Powershell?

Question

I have a BlobTrigger azure function on Powershell. I am trying get the blob uri in order to create a managed disk out of this vhd blob with the below scipt:

$diskConfig = New-AzDiskConfig -AccountType $storageType -Location $location -CreateOption Import -StorageAccountId $storageAccountId -SourceUri $sourceVHDURI

New-AzDisk -Disk $diskConfig -ResourceGroupName $resourceGroupName -DiskName $diskName

From the cloud shell, i can get the uri with code below:

$(Get-AzureStorageBlob -Blob myblob -Container 'mycontainer' -Context $StorageContext).ICloudBlob.uri.AbsoluteUri

But with Azure Functions, i cannot. My AF code is below:

# Input bindings are passed in via param block.
param([byte[]] $InputBlob, $TriggerMetadata)

# Write out the blob name and size to the information log.
Write-Host "PowerShell Blob trigger function Processed blob! Uri: $($InputBlob.ICloudBlob.uri.AbsoluteUri)"

$InputBlob.ICloudBlob.uri.AbsoluteUri returns empty. I have checked blob documentation , but couldn't find any solutions.

Do you have any suggestions?

$InputBlob already contains the data from the blob as a byte array. Are you sure you need the URI? — Anatoli Beliaev
– Anatoli Beliaev, Commented Aug 28, 2020 at 21:55
I have added to the question my script which creates a NewAzDisk. There, i need the blob uri for -SourceUri parameter. I don't know how to create a NewAzDisk by using a byte array with Powershell — MoonHorse
– MoonHorse, Commented Aug 29, 2020 at 9:43

Alex · Accepted Answer · 2020-08-30 06:08:50Z

2

You can try $TriggerMetadata.Name to get the name, or $TriggerMetadata.Uri as suggested by @Anatoli Beliaev.

As an alternative, you can try something like this (untested):

param([Microsoft.Azure.Storage.Blob.ICloudBlob] $myBlob)

This works in .NET at least, and the documentation looks like it might behave similarly.

https://learn.microsoft.com/en-us/azure/azure-functions/functions-reference-powershell?tabs=portal#type-casting-for-triggers-and-bindings

For certain bindings like the blob binding, you're able to specify the type of the parameter.

For example, to have data from Blob storage supplied as a string, add the following type cast to my param block:
param([string] $myBlob)

edited Aug 30, 2020 at 6:08

answered Aug 29, 2020 at 10:58

Alex

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3 Comments

Anatoli Beliaev Over a year ago

[string] $myBlob will still give you the same content of the blob, just converted to a string.

Alex Over a year ago

Ah, obviously it does, I somehow got confused. Thanks for the info, I changed the answer.

JDoshi Over a year ago

@AlexAIT I am using $TriggerMetaData.Name to get Name of blob but it happens to be empty. Please let me know quick fix if possible. Otherwise i'll post different thread for the same.

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