Custom binding error

[asavaritayal]

I created an HTTP triggered function with an output binding of type Azure Table Storage. Here is the function.json definition:

{
  "scriptFile": "__init__.py",
  "bindings": [
    {
      "authLevel": "anonymous",
      "type": "httpTrigger",
      "direction": "in",
      "name": "req",
      "methods": [
        "get",
        "post"
      ]
    },
    {
      "type": "http",
      "direction": "out",
      "name": "$return"
    },
    {
      "type": "table",
      "dataType": "string",
      "direction": "out",
      "name": "table",
      "tableName": "commitsTable",
      "connection": "AzureWebJobsStorage"
    }
  ]
}

I see the following error when trying to run locally:

Executing 'Functions.PushEvent' (Reason='This function was programmatically called via the host APIs.', Id=a079f757-06a1-4ca0-b2fd-6eb41f4e8953)
[5/6/19 5:38:18 AM] Executed 'Functions.PushEvent' (Failed, Id=a079f757-06a1-4ca0-b2fd-6eb41f4e8953)
[5/6/19 5:38:18 AM] System.Private.CoreLib: Exception while executing function: Functions.PushEvent. System.Private.CoreLib: Result: Failure
[5/6/19 5:38:18 AM] Exception: FunctionLoadError: cannot load the PushEvent function: unknown type for table binding: "table"
[5/6/19 5:38:18 AM] Stack:   File "/usr/local/Cellar/azure-functions-core-tools/2.7.1149/workers/python/deps/azure/functions_worker/dispatcher.py", line 232, in _handle__function_load_request
[5/6/19 5:38:18 AM]     function_id, func, func_request.metadata)
[5/6/19 5:38:18 AM]   File "/usr/local/Cellar/azure-functions-core-tools/2.7.1149/workers/python/deps/azure/functions_worker/functions.py", line 179, in add_function
[5/6/19 5:38:18 AM]     f'unknown type for {param.name} binding: "{desc.type}"')
[5/6/19 5:38:18 AM] .

I expected this to work since the issue here - #66 has been closed.

[elprans]

@asavaritayal #66 laid the foundation for the unstructured bindings, but we didn't explicitly enable support for arbitrary binding types, only the bindings that are supported (registered) otherwise. If generic support for arbitrary bindings is desired, I can make a PR to enable this behavior.

[asavaritayal]

@elprans the primary purpose of #66 was to enable bindings that are not supported out of the box in Functions. The current functionality does not provide any net new addition to the platform. I'll re-open the issue to track the work required.