Any way to share state between route handlers?

[vors]

I'm looking for a way to create few related endpoints.
I would be good to be able to share some objects between them.

For example, that could work in theory

$global:foo = 444
New-PostRoute -Path "/foo" -ScriptBlock {
    param($request,$response)                                                                        $response.Send("foo = " +  $global:foo)
}

[TylerLeonhardt]

Such is the downside of using a runspace pool - no shared state. That said, with #49 middleware could be used to share state.

# New middleware command - will get run before every route script block gets executed
New-RouteMiddleware -Name SetupGlobalFoo -ScriptBlock {
    $global:foo = 444
}

# note the removal of the param! Breaking change in latest PR
New-PostRoute -Path "/foo" -ScriptBlock {
    $response.Send("foo = " +  $global:foo)
}
New-PostRoute -Path "/bar" -ScriptBlock {
    $response.Send("foo = " +  $global:foo)
}

Is it the ideal situation? Not yet - but it's something for now. I'm toying with the idea of taking all $global:* vars and loading them in a middleware.

Middleware just got merged in - still need to update docs and whatnot. Docs are coming though :)

[vors]

Hm, I think it would be good to have a switch, maybe on Start-Polaris to load all vars.
We did something similar for Invoke-Parallel.
It's the same story: we want to benefit from a thread pool, but it should be brain-dead to use. Ideally, a drop-in replacement that can immediately use the code that user already wrote.

In the invoke-parallel case, the goal was to go from 1..100 | % {...} to 1..100 | <something> (...) where the {...} would not need to change. Then it's very easy to adopt when user realize that they will benefit from parallelism. Compare it with the PS job for parallelization: you need to marshall all arguments and write a fair amount of code to achieve it.
So this is a very inefficient switch, but it sure saves time and that's what needed for quick iterations. And that sure should not be the default.

[TylerLeonhardt]

This should work now since we are using Register-ObjectEvent and share the runspace 😃