PulumiFn.Create<TStack>() only accepts empty constructor stacks

[dsarosi]

Hello!

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Issue details

PulumiFn.Create() only works with empty Constructors. However, I wish to implement a web service that creates a stack per user. Thus the web app needs to pass parameters to the Stack via the constructor.

public class MyCustomStack: Stack
{
    public MyCustomStack(string parameter1, string parameter2)
    {
      ....
    }
}

var program = PulumiFn<MyCustomStack>("param1", "param2");

I cannot do the following as PulumiFn is marked as an internal class.

new PulumiFn<MyCustomStack>(() =>
            new MyCustomStack("param1", "param2"));

Affected area/feature

Automation API, but could also be implemented for the CLI.

[justinvp]

Thanks for the suggestion!

Seems reasonable to provide an overload of Create that could enable that, something like:

public static PulumiFn Create<TStack>(Func<TStack> stackFactory)
    where TStack : Stack

Usage:

var program = PulumiFn.Create(() => MyCustomStack("param1", "param2"));

In the meantime, as a workaround, you could use other overloads of PulumiFn.Create that aren't based on Pulumi.Stack.

[JasonWhall]

@dsarosi - This works for me:

PulumiFn.Create(() => new MyCustomStack("param1", "param2");

Full example for completeness

  using System.Collections;
  using Pulumi.Automation;
  using Pulumi.Random;
  
  var program = PulumiFn.Create(() => new MyCustomStack("test", "example"));
  
  var programArgs = new InlineProgramArgs("test", "test-random", program)
  {
      EnvironmentVariables = new Dictionary<string, string?>
      {
          { "PULUMI_CONFIG_PASSPHRASE", "supersecret" }
      }
  };
  
  var stack = await LocalWorkspace.CreateOrSelectStackAsync(programArgs);
  
  await stack.UpAsync(new UpOptions
  {
      OnStandardOutput = Console.WriteLine,
      OnStandardError = Console.WriteLine
  });
  
  public class MyCustomStack : Stack
  {
      public MyCustomStack(string param1, string param2)
      {
          _ = new RandomPet($"{param1}-{param2}");
      }
  }