feat(12): nix installation of exercise

12-order-summary-component-thymeleaf/.gitignore

@@ -0,0 +1,16 @@
+.bsp/
+.scala-build/
+.metals/
+.direnv
+*/dist/
+/11-single-price-grid-component/.bloop/
+
+**/.bloop
+**/project/project/
+**/project/metals.sbt
+**/project/.bloop
+**/project/target/
+**/target/
+
+*/result
+result

12-order-summary-component-thymeleaf/default.nix

@@ -0,0 +1,90 @@
+{ pkgs, lib, sbt-derivation }:
+
+let
+  package = sbt-derivation.lib.mkSbtDerivation {
+    inherit pkgs;
+    # ...and the rest of the arguments
+    pname = "order-summary-component-app";
+    version = "0.0.1";
+    src = pkgs.nix-gitignore.gitignoreSource [ ] ./.;
+    nativeBuildInputs = [ pkgs.nodePackages.tailwindcss ];
+    buildPhase = ''
+      sbt assembly
+      tailwindcss -i ./src/input.css -o ./output.css
+    '';
+    # css path different from ordinary development,
+    # because .gitignore makes it unavailable during nix build
+    # anyway copied to correct place
+    installPhase = ''
+      mkdir -p $out/bin
+      cp target/scala-*/order-summary-component-assembly-*.jar $out/bin/order-summary-component.jar
+      mkdir -p $out/bin/dist
+      cp ./output.css $out/bin/dist/output.css
+      cp -r public $out/bin/public
+    '';
+
+    depsSha256 = "sha256-ADQB4qTl69ERlLAURrtR3fWa7PUdYjFLk5QdU5QgxRQ=";
+  };
+
+  module = { config, pkgs, ... }:
+    let cfg = config.services.orderSummaryComponent;
+    in {
+      options.services.orderSummaryComponent = {
+        enable = lib.mkEnableOption "My service";
+
+        port = lib.mkOption {
+          type = lib.types.int;
+          default = 8080;
+          description = "Port to listen on.";
+        };
+
+        host = lib.mkOption {
+          type = lib.types.str;
+          default = "localhost";
+          description = "Host to bind to.";
+        };
+
+        useNginx = lib.mkOption {
+          type = lib.types.bool;
+          default = true;
+          description = "Whether to use Nginx to proxy requests.";
+        };
+      };
+      config = lib.mkIf cfg.enable {
+        users.groups.order-summary-component-group = { };
+        users.users.order-summary-component-user = {
+          isSystemUser = true;
+          group = "order-summary-component-group";
+        };
+
+        systemd.services.orderSummaryComponent =
+          let serverHost = if cfg.useNginx then "localhost" else cfg.host;
+          in {
+            description = "Exercise app Order Summary Component";
+            wantedBy = [ "multi-user.target" ];
+            after = [ "network.target" ];
+            startLimitIntervalSec = 30;
+            startLimitBurst = 10;
+            serviceConfig = {
+              ExecStart =
+                "${pkgs.jdk}/bin/java -jar ${package}/bin/order-summary-component.jar -p ${
+                  toString cfg.port
+                } --host ${serverHost}";
+              WorkingDirectory = "${package}/bin";
+              Restart = "on-failure";
+              User = "order-summary-component-user";
+              Group = "order-summary-component-group";
+            };
+          };
+
+        services.nginx = lib.mkIf cfg.useNginx {
+          virtualHosts.${cfg.host} = {
+            locations."/".proxyPass = "http://127.0.0.1:${toString cfg.port}";
+          };
+        };
+      };
+    };
+in {
+  package = package;
+  module = module;
+}

12-order-summary-component-thymeleaf/project/plugins.sbt

@@ -1 +1,3 @@
 addSbtPlugin("io.spray" % "sbt-revolver" % "0.10.0")
+
+addSbtPlugin("com.eed3si9n" % "sbt-assembly" % "2.1.1")

flake.nix

@@ -15,6 +15,10 @@
           inherit pkgs sbt-derivation;
           lib = pkgs.lib;
         };
+        order-summary = import ./12-order-summary-component-thymeleaf/default.nix {
+          inherit pkgs sbt-derivation;
+          lib = pkgs.lib;
+        };
       in {
         devShells.default = pkgs.mkShell {
           buildInputs = [
@@ -28,6 +32,8 @@
         };
         packages.price-grid-app = price-grid.package;
         nixosModules.price-grid-app = price-grid.module;
+        packages.order-summary = order-summary.package;
+        nixosModules.order-summary = order-summary.module;
       });
   # see https://serokell.io/blog/practical-nix-flakes
 }