Update C# examples to use the new F.Invoke feature

[t0yv0]

Context: pulumi/pulumi#7948

Updates C# examples to use F.Invoke feature.

This PR will not compile and be ready to merge until:

1. Minimally extend .NET SDK to support 5758 pulumi#8142 is released in a new version of Pulumi .NET SDK
2. 5758 for C#/.NET pulumi#7899 is merged in pulumi/pulumi
3. providers are updated to take advantage of 7899
4. Fix 8322 pulumi#8339 fix released

It is ready for review however, only minimal changes to build refs are expected once the prereqs land.

[t0yv0]

Done 28/295
Next aws-django-voting-app/Pulumi.yaml
Done for C# 28/34
Next C# azure-cs-net5-aks-webapp/Pulumi.yaml

To be continued.

[mikhailshilkov]

For a second, I thought I missed that we landed .NET invokes already. These changes look great!

[t0yv0]

@mikhailshilkov it's fairly close, I expect next planned release to land SDK changes and the cycle after that land the providers changes.

[t0yv0]

CI indicates pulumi-aws has not upgraded yet, but this should be coming shortly.

[t0yv0]

I think the remaining CI failure is legitimate, it's indicative of preview failure; waiting on this fix: pulumi/pulumi#8339

[Frassle]

Invokes normally run at preview time right? So while this looks neater and smaller it's unnecessarily moved to Output space?

[mikhailshilkov]

What's bad about that?

[Frassle]

Well in general Output is more constrained in what you can do with it than Task. I don't think it really matters here because the inputs are always going to be known and so these invokes will run anyway just wondering out loud if this is going to make things more difficult with preview constraints as even more stuff is in Outputs.

[t0yv0]

We had a similar debate in TypeScript with Pat eventually resolved it to the rule "if the change makes Output appear that was not there before, it's a bad change". I'm happy to roll it back.

[t0yv0]

Invokes should not be running in preview AFAIK.

[Frassle]

Invokes should run in preview if the Inputs are known though?

[mikhailshilkov]

Old-style invokes totally run in preview unless inside an unresolved apply

[t0yv0]

Undoing classic-azure examples as C# feature has not rolled out yet.

[t0yv0]

Confirming CI failure fixed on 3.17.1 but something is busted with the release as release automation is picking up 3.17.0.

[t0yv0]

So @Frassle check this out.

using System;
using Pulumi;
using Ec2 = Pulumi.Aws.Ec2;

class EksStack : Stack
{
    public EksStack()
    {
        //NewVersion();
        OldVersion();
    }

    public void NewVersion()
    {
        // Read back the default VPC and public subnets, which we will use.
        var vpc = Ec2.GetVpc.Invoke(new Ec2.GetVpcInvokeArgs { Default = true });

        PrintIsKnown(vpc);

        var vpcId = vpc.Apply(vpc =>
        {
            Console.WriteLine($"vpc.Id={vpc.Id}");
            return vpc.Id;
        });

        PrintIsKnown(vpcId);

        var subnetIds = Ec2.GetSubnetIds.Invoke(new Ec2.GetSubnetIdsInvokeArgs { VpcId = vpcId })
            .Apply(s =>
            {
                Console.WriteLine($"s.Ids={s.Ids}");
                return s.Ids;
            });

        PrintIsKnown(subnetIds);
    }

    public void OldVersion()
    {
        var vpc = Output.Create(Ec2.GetVpc.InvokeAsync(new Ec2.GetVpcArgs
        {
            Default = true
        }));

        PrintIsKnown(vpc);

        var vpcId = vpc.Apply(vpc =>
        {
            Console.WriteLine($"vpc.Id={vpc.Id}");
            return vpc.Id;
        });

        PrintIsKnown(vpcId);

        var subnet = vpcId.Apply(id => Ec2.GetSubnetIds.InvokeAsync(new Ec2.GetSubnetIdsArgs {VpcId = id}));

        var subnetIds = subnet.Apply(s =>
        {
            Console.WriteLine($"s.Ids={s.Ids}");
            return s.Ids;
        });

        PrintIsKnown(subnetIds);
    }


    public void PrintIsKnown<T>(Output<T> output)
    {
        Output.Create(Pulumi.Utilities.OutputUtilities.GetIsKnownAsync(output)).Apply(isKnown =>
        {
            Console.WriteLine($"IsKnown: {isKnown}");
            return 0;
        });
    }

}

Both versions print the same output in pulumi preview:

   vpc.Id=vpc-b6f1edcc
    IsKnown: True
    IsKnown: True
    s.Ids=System.Collections.Immutable.ImmutableArray`1[System.String]
    IsKnown: True

[t0yv0]

So yes it sounds like invokes would run in preview if known. The two forms seem equivalent.

[t0yv0]

Unbelievable, green checkmark from CI! 🙂