python azure function app define variables for path

user_10513304 0
Viewed 1789

I have defined a out binding to store file in blobstorage:

function.json:

{
  "type": "blob",
  "direction": "out",
  "name": "outputBlob",
  "path": "outcontainer/{outname}",
  "connection": "storagevoyager_STORAGE"
}

Now i try to specify the "outname" in python code:

outputBlob.outname = "test.txt"
outname = "test.txt"
outputBlob.set(fileobj)

System.Private.CoreLib: Exception while executing function: Functions..Microsoft.Azure.WebJobs.Host: No value for named parameter 'outname'.

So how can i define the outname in my code ? I can't find any good reference.

Do i need to update enviroment variables? Also with {rand-guid} it will work.

azure-functions azure python-3.x python
3 Answers

Seems its impossible to change the variable with Python, in C# its possible to change.

To use it in python i am using python sdk and connect manually to my storage:

from azure.storage.blob import BlockBlobService

blob_service_client = BlockBlobService(account_name="storageacc", account_key="acckey")
blob_service_client.create_container(container_name)
blob_service_client.create_blob_from_bytes(container_name="container_name", blob_name="filename.txt", blob=b"blob")
user_105133040

If you are using a trigger like HttpTrigger, you can actually set the {outname} if you pass outname as a param in your http request! if you are using any other triggers like service bus if you pass in the json message. You could just set the input and output binding path with the json value from the trigger json data. take a look at this JSON payloads i tried this and it works in python

user_105454260

If you want to change the output blob name with the code, it is impossible. If you want to dynamically create output blob name, you can use the binding expression {rand-guid} in function.json to implement it.

For example

{
  "type": "blob",
  "direction": "out",
  "name": "outputBlob",
  "path": "outcontainer/{rand-guid}.txt",
  "connection": "storagevoyager_STORAGE"
}

For more details, please refer to the document

user_105050400
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