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Hi,
I'm writing an Azure Function that will need to read a file that has been uploaded to a certain container in a storage account in my Azure subscription.
I had a look at the docs of both Javascript (NodeJS) and Python SDKs, but apparently all the utils access to a file share instead of a container in a storage account.
Is there a way to read files from a container?
Thank you. Regards.
An Azure service that provides an event-driven serverless compute platform.
Globally unique resources that provide access to data management services and serve as the parent namespace for the services.
Answer accepted by question author
@Francisco Dominguez Azure function storage trigger only triggered when the blob is added/updated. If your requirement is you want to monitor only one container then you can configure the path with the container path for your input binding so your function only monitors your define container/path when the blob is added/updated.
Thanks for your fast answer. The issue here is that I'm trying to read and perform certain operations with an excel file. I believe there's no way to read an excel file from a blob (the one you get as parameter in the Azure Function), that's why I wanted to read the file directly from the container.
Is there something that I'm missing here?
Regards.
@Francisco Dominguez The input binding allows you to read blob storage data as input to an Azure Function. Using this input stream you need to create the file/modify it and then use Output binding to modify/create to the blob storage. You can use temporary folder to save the file for the operation.
Hi @MayankBargali-MSFT thanks again for your answer.
Are there any Microsoft Learn on how to manipulate the blob storage data? As I said, I need to read the file as a whole, and this file is an excel. What is the proper way to load a file from the given blob data?
Regards.
@Francisco Dominguez The storage trigger document does cover the usage, configuration, attributes of your binding. As per the usage section it is used as InputStream. I am using this inputstream and creating the file in the temp location on my function. Now you can write you own code to load this file, modify it according to your need. Rather than creating the temporay file you can also load this InputStream to any of the library that supports excel operation.
If your requirement is that you want to replace the same storage file then I will not suggest you to use blob trigger as mentioned previously as it will retrigger the function again once you have uploaded the blob.
def main(myblob: func.InputStream) :
logging.info(f"Python blob trigger function processed blob \n")
tempFilePath = tempfile.gettempdir()
filepath = tempFilePath + "\\" + myblob.name.split("/")[-1]
with open(filepath,"w+b") as local_blob:
local_blob.write(myblob.read())