nixos/hledger-web: init module and test

nixos/modules/module-list.nix

@@ -876,6 +876,7 @@
   ./services/web-apps/gotify-server.nix
   ./services/web-apps/grocy.nix
   ./services/web-apps/hedgedoc.nix
+  ./services/web-apps/hledger-web.nix
   ./services/web-apps/icingaweb2/icingaweb2.nix
   ./services/web-apps/icingaweb2/module-monitoring.nix
   ./services/web-apps/ihatemoney

nixos/modules/services/web-apps/hledger-web.nix

@@ -0,0 +1,77 @@
+{ lib, pkgs, config, ... }:
+with lib;
+let
+  cfg = config.services.hledger-web;
+in {
+  options.services.hledger-web = {
+
+    enable = mkEnableOption "hledger-web service";
+
+    serveApi = mkEnableOption "Serve only the JSON web API, without the web UI.";
+
+    host = mkOption {
+      type = types.str;
+      default = "127.0.0.1";
+      description = ''
+        Address to listen on.
+      '';
+    };
+
+    port = mkOption {
+      type = types.port;
+      default = 5000;
+      example = "80";
+      description = ''
+        Port to listen on.
+      '';
+    };
+
+    capabilities = mkOption {
+      type = types.commas;
+      default = "view";
+      description = ''
+        Enable the view, add, and/or manage capabilities. E.g. view,add
+      '';
+    };
+
+    journalFile = mkOption {
+      type = types.path;
+      example = "/home/hledger/.hledger.journal";
+      description = ''
+        Input journal file.
+      '';
+    };
+
+    baseUrl = mkOption {
+      type = with types; nullOr str;
+      default = null;
+      example = "https://example.org";
+      description = ''
+        Base URL, when sharing over a network.
+      '';
+    };
+  };
+
+  config = mkIf cfg.enable {
+    systemd.services.hledger-web = {
+      description = "hledger-web - web-app for the hledger accounting tool.";
+      documentation = [ https://hledger.org/hledger-web.html ];
+      wantedBy = [ "multi-user.target" ];
+      after = [ "networking.target" ];
+      serviceConfig = {
+        ExecStart = ''
+          ${pkgs.hledger-web}/bin/hledger-web \
+          --host=${cfg.host} \
+          --port=${toString cfg.port} \
+          --file=${cfg.journalFile}  \
+          "--capabilities=${cfg.capabilities}" \
+          ${optionalString (cfg.baseUrl != null) "--base-url=${cfg.baseUrl}"} \
+          ${optionalString (cfg.serveApi) "--serve-api"}
+        '';
+        Restart = "always";
+      };
+    };
+  };
+
+  meta.maintainers = with lib.maintainers; [ marijanp ];
+}

nixos/tests/all-tests.nix

@@ -155,6 +155,7 @@ in
   # not on other platforms.
   hibernate = handleTestOn ["x86_64-linux"] ./hibernate.nix {};
   hitch = handleTest ./hitch {};
+  hledger-web = handleTest ./hledger-web.nix {};
   hocker-fetchdocker = handleTest ./hocker-fetchdocker {};
   home-assistant = handleTest ./home-assistant.nix {};
   hostname = handleTest ./hostname.nix {};

nixos/tests/hledger-web.nix

@@ -0,0 +1,53 @@
+import ./make-test-python.nix ({ pkgs, lib, ... }:
+let
+  journal = pkgs.writeText "test.journal" ''
+    2010/01/10 Loan
+        assets:cash                 500$
+        income:loan                -500$
+    2010/01/10 NixOS Foundation donation
+        expenses:donation           250$
+        assets:cash                -250$
+  '';
+in
+rec {
+  name = "hledger-web";
+  meta.maintainers = with lib.maintainers; [ marijanp ];
+
+  nodes = {
+    server = { config, pkgs, ... }: rec {
+      services.hledger-web = {
+        host = "127.0.0.1";
+        port = 5000;
+        enable = true;
+        journalFile = journal;
+      };
+      networking.firewall.allowedTCPPorts = [ services.hledger-web.port ];
+    };
+    apiserver = { config, pkgs, ... }: rec {
+      services.hledger-web = {
+        host = "127.0.0.1";
+        port = 5000;
+        enable = true;
+        serveApi = true;
+        journalFile = journal;
+      };
+      networking.firewall.allowedTCPPorts = [ services.hledger-web.port ];
+    };
+  };
+
+  testScript = ''
+    start_all()
+
+    server.wait_for_unit("hledger-web.service")
+    server.wait_for_open_port(5000)
+    with subtest("Check if web UI is accessible"):
+        page = server.succeed("curl -L http://127.0.0.1:5000")
+        assert "test.journal" in page
+
+    apiserver.wait_for_unit("hledger-web.service")
+    apiserver.wait_for_open_port(5000)
+    with subtest("Check if the JSON API is served"):
+        transactions = apiserver.succeed("curl -L http://127.0.0.1:5000/transactions")
+        assert "NixOS Foundation donation" in transactions
+  '';
+})