How to access the blob name in function.json output bindings path key of a particular blob which triggered event grid

I was referred to this repo by a official member.

{
  "bindings": [
    {
      "type": "eventGridTrigger",
      "name": "eventGridEvent",
      "direction": "in"
    },
    {
      "name": "inputBlob",
      "type": "blob",
      "path": "{data.url}",
      "connection": "projectimagestore_STORAGE",
      "direction": "in",
      "datatype": "binary"
    },
    {
      "name": "outputBlob",
      "direction": "out",
      "type": "blob",
      "path": "compressedprojectimages/{filename}",
      "connection": "projectimagestore_STORAGE"
   ]
}

I want to access the current filename (blob name on which function is being processed) on key “path”: “container/{filename}” suppose the file name is test.jpg so the container container should also store test.jpg.

Note: I have two different container. I am getting input from one container and want to store the processed blob with same filename in another container.

As of now if I try to run function it gives an error like no value for filename

I don’t know what to put in path.

How my function looks like

const fetch = require("node-fetch");
module.exports = async function (context, eventGridEvent, inputBlob) {
    try{
    context.log(typeof eventGridEvent);
    context.log(eventGridEvent);
    context.log(context);
    context.log(typeof inputBlob);
    context.log({inputBlob})

   // context.bindings.outputBlob = inputBlob

    }
};

azure func v2 core tools

node v 12 LTS

Using Blob storage

Found this error which blob was created in container

Thanks

[ramya-rao-a]

Hey @DVGY

Thanks for the clarification and your patience

This repository is for the JavaScript libraries for different Azure services. Your question is more on the side of working with bindings in Azure functions. Based on this pointer for reporting issues, it looks like the right place for you to log this issue would be https://github.com/Azure/azure-webjobs-sdk-script

I was referred to this repo by a official member.

Can you share who referred this repo to you? We would like to make sure we clarify the purpose of this repo to them as well.

Q1. What really happens when we write path:{data.url}? How data.url is made available inside “name”: “inputBlob”, “type”: “blob”, “path”: “{data.url}”, Does it do a search for data.url key inside bindingsData or bindings value present inside Invocation Context. ?

According to JSON payloads and binding expressions, since the event data payload is a JSON object, you are able to refer to anything inside it in the bindings

Unfortunately, the event data payload only has the blob url and not the blob name, otherwise you could have used it. The folks at https://github.com/Azure/azure-webjobs-sdk-script should be able to help you better.

[ramya-rao-a]

Thanks @DVGY

@jiacfan fyi, please see https://github.com/Azure/azure-sdk-for-js/issues/13024#issuecomment-751905247