nixops-configuration/lib/node-application.nix

{pkgs, config, ...}@args:
	{src, name, mainBinaryPath, setupCommands ? "", serviceOptions ? {}, serviceConfig ? {}, hasErrorReporting ? false, errorPath ? null}:
		with pkgs.stdenv.lib;

		let
			buildNode2nixPackage = (import ./build/node2nix-package.nix) args;
			errorReporter = (import ./node-error-reporter) args;
			optionalValue = (import ./util/optional-value.nix);
		in let
			serviceName = "node-${name}";
			cfg = config.services."${serviceName}";

			application = buildNode2nixPackage {
				name = "${serviceName}-source";
				inherit src setupCommands;
			};

			errorReporterModule = optionalValue hasErrorReporting (errorReporter {
				applicationName = name;
				inherit application errorPath;
			});
		in
			{
				imports = [
					errorReporterModule
				];

				options.services."${serviceName}" = {
					enable = mkEnableOption "${name}";
				} // serviceOptions;

				config = {
					# FIXME: What if a username conflict occurs?
					users.extraUsers."${name}" = mkIf cfg.enable {
						description = "${name} Service User";
					};

					systemd.services."${serviceName}" = mkIf cfg.enable ({
						description = "${name} Service";
						wantedBy = ["multi-user.target"];
						after = ["network.target"];

						serviceConfig = {
							ExecStart = "${application}/${mainBinaryPath}";
							User = name;
							PermissionsStartOnly = true;
							Restart = "on-failure";
						};
					} // serviceConfig);
				};
			}