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I wanted to even further simplify the build tooling overhead. My general
goal is to not have to think about declaring packages, or dependencies,
or really anything that you might find in a cabal file. Not all of these
goals are possible, but we can get pretty close. With this commit all I
need for the 'buildGhc/buildGhcjs' functions is the path to the
entrypoint file; everything else is either inferred by the Nix code or
declared in the Haskell code comments.
The strategy is to map a Haskell module to an executable artifact, and
pass just that module to 'ghc --make'. Then we can rely on ghc to handle
walking the local filesystem for imports. The only thing ghc really
needs to know is a name for the output executable; it is hard to
automatically infer this, so we have a simple comment syntax to declare
this in the file. The comment syntax is inspired by existing Haskell
'LANGUAGE' pragmas; having this in the same file keeps the configuration
as close to the real code as possible. The Nix code then extracts this
info from the code comments, and sets the required ghc flags.
Second, we need to declare the set of 3rd-party packages that our
program relies on. For this we can re-use the same comment syntax and
just list the dependencies, then extract them in Nix and construct a
package set as we were before.
This reduces the amount of "package declaration" code we have to write
in default.nix, and reduces the amount of time we have to spend
switching between the Haskell code and the Nix code (I find such context
switching super annoying). I also think having the configuration in with
the Haskell code encourages us to write smaller, simpler modules and
only write code that we need.
Additionally, I refactored the bild and ghci (now called 'repl') scripts
to work in any directory. The .envrc uses direnv to set the path so that
you can run these scripts anywhere. That means the following works:
$ cd Run/Que
$ bild Website
$ repl Server
λ> :l Run.Que.Server
I find this to be a rather nice workflow.
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I also block before taking, instead of doing a mult and tap. This is a
simple way to fix the memory issue, and makes them conceptually simpler
to work with I think.
The channels are still mutli-consumer and multi-producer, which is
fine. I'm not sure now I will implement the regular pubsub, but I'm not
sure there is a great usecase for that anyway.
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If we've gotten past the first auth check then we are already
"authenticated", or whatever.
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Turns out the ultimate reason was that I wasn't actually returning out
of the handler, I was just setting the HTTP status. Now I'm sure that it
works correctly.
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First problem was that my `extract` function wasn't working. Second
problem was that nginx wasn't passing along the headers anyway.
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So now _ is the special namespace that only I can post to. Unfortunately
I think the guardIP function is still broken.
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Apparently guardIP wasn't working because it wasn't matching on the
right string, *and* I had typo'ed my IP address. I took this opportunity
to also organize the Scotty code a bit better with some comments.
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This is a simple website server that uses que.run itself to host the que
webpages.
I had to rename Run.Que to Run.Que.Server because nix was
complaining about Run.Que being both a derivation and an attrset with
Run.Que.Website in it.
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