Azure function blob trigger for subfolders

Question

I have a container folder where there are many sub-folders(around 3000), a file can land in any of the sub-folders. I need to react to a blob that's added into a sub-folder. I still can't figure out how to create a blob trigger if files are added to sub-folders.

Example:

Excerpt from function.json:
{
"name": "myblob",
"type": "blobTrigger",
"direction": "in",
"path": "rootContainer/{name}"
}

OK, a function is triggered if I receive the blob in rootContainer folder

Except from function.json:
{
"name": "/myblob",
"type": "blobTrigger",
"direction": "in",
"path": "rootContainer/{name}"
}
or
{
"name": "myblob",
"type": "blobTrigger",
"direction": "in",
"path": "rootContainer//{name}"
}
NOT OK, a function isn't triggered

There are not many questions regarding this problem and they still don't provide a normal answer. Can't find any info in documentation either.

Thanks!

Answer 1

Hi @Amey Pimpley

The first function.json content that you used should work for you. I have created function from the Azure portal and have also tested locally and didn't observe any issue. When there is any blob uploaded to any of the subfolders the function app is getting triggered. You can refer to blob trigger input binding document.

If you are created function from the Azure portal make sure that you have defined the connection parameter.

In the below logs you can see it works when there is a file uploaded in subdirectories.

If you are still facing the issue please let me know so I can connect with you offline and assist you further.

Please 'Accept as answer' and ‘Upvote’ if it helped so that it can help others in the community looking for help on similar topics.

Answer 2

source:
BlobTrigger("staging/{name}/lots/images"

Destination:
[Blob("staging/{name}/lots/thumbnails/{name}_thumbnail"

BlogTrigger not triggering when image added in subdirectory