Node: Blob output binding should support passing a Buffer

[mikhailshilkov]

What problem would the feature you're requesting solve? Please describe.

I'm running a Node.js Azure Function with an output Blob binding. I'm trying to save a binary file from a Buffer.

My binding:

{
  "name":"copy",
  "type":"blob",
  "direction":"out",
  "path":"files/copy-{name}",
  "connection":"StorageConnectionStringKey",
  "dataType":"binary"
}

Note that I tried dataType=binary but it doesn't seem to make any difference.

and in the function body:

return { copy: new Buffer("Hello") };

The blob contents is written as

{"type":"Buffer","data":[72,101,108,108,111]}

Describe the solution you'd like

It should save the data from the Buffer as-is. Hello in this case.

Related Issues

• Set a Content-Type
• Blob bindings can't set ContentType and other properties

[eirikb]

@mikhailshilkov Have you tried using context.bindings instead of return?

context.bindings.copy = Buffer.from('Hello');

[mikhailshilkov]

@eirikb I think I did but I can't remember for sure. Are you saying it works?

[eirikb]

Works for me when I did some tests. Using { copy: Buffer.from('Hello') } gave me same result as you. Also tried converting to Uint8Array and Uint32Array (I have to use the first one for binary data), but without success when using return.

[mikhailshilkov]

@eirikb That's weird! Thank you, I'll give it a try.

[mhoeger]

Fixing this with Functions V3. Thanks!