feat(11): initial module with a service

.gitignore

@@ -12,3 +12,4 @@
 */target/
 
 */result
+result

11-single-price-grid-component/default.nix

@@ -1,4 +1,4 @@
-{ pkgs, sbt-derivation }:
+{ pkgs, lib, sbt-derivation }:
 
 let
   package = sbt-derivation.lib.mkSbtDerivation {
@@ -17,7 +17,7 @@ let
     # anyway copied to correct place
     installPhase = ''
       mkdir -p $out/bin
-        cp target/scala-*/priceGrid-assembly-*.jar $out/bin/
+      cp target/scala-*/priceGrid-assembly-*.jar $out/bin/priceGridApp.jar
       mkdir -p $out/bin/dist
       cp ./output.css $out/bin/dist/output.css
       cp -r public $out/bin/public
@@ -26,14 +26,47 @@ let
     depsSha256 = "sha256-aWLqnPXvchtNqpSfXo5sWyK2QFNn1GqToy58cWrML3U=";
   };
 
-  module = { config, pkgs, ... }: {
+  module = { config, pkgs, ... }:
-    services.price-grid-app = {
+    let cfg = config.services.priceGridService;
-      enable = true;
+    in {
-      package = package;
+      options.services.priceGridService = {
+        enable = lib.mkEnableOption "My service";
+
+        port = lib.mkOption {
+          type = lib.types.int;
+          default = 8080;
+          description = "Port to listen on.";
+        };
+
+        host = lib.mkOption {
+          type = lib.types.str;
+          default = "localhost";
+          description = "Host to bind to.";
         };
       };
-in
+      config = lib.mkIf cfg.enable {
-{
+        users.groups.price-grid-app-group = { };
+        users.users.price-grid-app-user = {
+          isSystemUser = true;
+          group = "price-grid-app-group";
+        };
+
+        systemd.services.price-grid-app = {
+          description = "My Java Service";
+          wantedBy = [ "multi-user.target" ];
+          after = [ "network.target" ];
+
+          serviceConfig = {
+            ExecStart =
+              "${pkgs.jdk}/bin/java -jar ${package}/bin/priceGridApp.jar -p ${toString cfg.port} --host ${cfg.host}";
+            Restart = "on-failure";
+            User = "price-grid-app-user";
+            Group = "price-grid-app-group";
+          };
+        };
+      };
+    };
+in {
   package = package;
   module = module;
 }

flake.nix

@@ -13,6 +13,7 @@
         pkgs = nixpkgs.legacyPackages.${system};
         price-grid = import ./11-single-price-grid-component/default.nix {
           inherit pkgs sbt-derivation;
+          lib = pkgs.lib;
         };
       in {
         devShells.default = pkgs.mkShell {