From 311aca867e54d2fb9db8bdf1cd43d4000808089f Mon Sep 17 00:00:00 2001
From: Jake Stanger <mail@jstanger.dev>
Date: Fri, 26 Apr 2024 23:03:15 +0100
Subject: [PATCH] chore: add nixos config

---
 flake.nix | 86 +++++++++++++++++++++++++++++++++++++++++++------------
 1 file changed, 68 insertions(+), 18 deletions(-)

diff --git a/flake.nix b/flake.nix
index b30f8b0..3dd456d 100644
--- a/flake.nix
+++ b/flake.nix
@@ -8,24 +8,74 @@
   };
 
   outputs = { self, nixpkgs, naersk, utils }:
-    utils.lib.eachDefaultSystem (system:
-      let
-        pkgs = import nixpkgs { inherit system; };
-        naerskLib = pkgs.callPackage naersk { };
-      in
-      {
-        defaultPackage = naerskLib.buildPackage ./.;
-
-        devShell = with pkgs; mkShell {
-          buildInputs = [ cargo rustc rustfmt rustPackages.clippy ];
-          RUST_SRC_PATH = rustPlatform.rustLibSrc;
-        };
+    utils.lib.eachDefaultSystem
+      (system:
+        let
+          pkgs = import nixpkgs { inherit system; };
+          naerskLib = pkgs.callPackage naersk { };
+        in
+        {
+          packages = rec {
+            corn-api = naerskLib.buildPackage ./.;
+            default = corn-api;
+          };
+        }) // {
+      nixosModules.default = { config, pkgs, ... }:
+        let
+          cfg = config.services.corn-api;
+          lib = pkgs.lib;
+          defaultPkg = self.packages.${pkgs.hostPlatform.system}.default;
+        in
+        {
+          options.services.corn-api = {
+            enable = lib.mkEnableOption "Web API for Corn configuration language";
+
+            package = lib.mkOption {
+              type = lib.types.package;
+              default = defaultPkg;
+              description = "The package to use";
+            };
+
+            host = lib.mkOption {
+              type = lib.types.str;
+              description = "The hostname to listen on";
+              default = "127.0.0.1";
+            };
+
+            port = lib.mkOption {
+              type = lib.types.port;
+              description = "The port number to listen on";
+              default = 5050;
+            };
+          };
+
+          config = let pkg = cfg.package; in {
+            systemd.services.corn-api = lib.mkIf cfg.enable {
+              description = "Web API for Corn configuration language";
+              documentation = [ "https://github.com/corn-config/corn-api" ];
 
-        nixConfig = {
-          extra-substituters = [ "https://cache.garnix.io" ];
-          extra-trusted-public-keys =
-            [ "cache.garnix.io:CTFPyKSLcx5RMJKfLo5EEPUObbA78b0YQ2DTCJXqr9g=" ];
+              serviceConfig = {
+                ExecStart = "${pkg}/bin/corn-api";
+                Restart = "on-failure";
+              };
+
+              environment.HOST = cfg.host;
+              environment.PORT = toString cfg.port;
+
+              wantedBy = [ "multi-user.target" ];
+            };
+          };
         };
-      }
-    );
+
+      devShell = with nixpkgs; mkShell {
+        buildInputs = [ cargo rustc rustfmt rustPackages.clippy ];
+        RUST_SRC_PATH = rustPlatform.rustLibSrc;
+      };
+
+      nixConfig = {
+        extra-substituters = [ "https://cache.garnix.io" ];
+        extra-trusted-public-keys =
+          [ "cache.garnix.io:CTFPyKSLcx5RMJKfLo5EEPUObbA78b0YQ2DTCJXqr9g=" ];
+      };
+    };
 }