{ config, lib, pkgs, ... }: with lib; let cfg = config.services.bcg; configFile = (pkgs.formats.yaml {}).generate "bcg.conf.yaml" ( filterAttrsRecursive (n: v: v != null) { inherit (cfg) device name mqtt; retain_node_messages = cfg.retainNodeMessages; qos_node_messages = cfg.qosNodeMessages; base_topic_prefix = cfg.baseTopicPrefix; automatic_remove_kit_from_names = cfg.automaticRemoveKitFromNames; automatic_rename_kit_nodes = cfg.automaticRenameKitNodes; automatic_rename_generic_nodes = cfg.automaticRenameGenericNodes; automatic_rename_nodes = cfg.automaticRenameNodes; } ); in { options = { services.bcg = { enable = mkEnableOption "BigClown gateway"; package = mkPackageOption pkgs [ "python3Packages" "bcg" ] { }; environmentFiles = mkOption { type = types.listOf types.path; default = []; example = [ "/run/keys/bcg.env" ]; description = '' File to load as environment file. Environment variables from this file will be interpolated into the config file using envsubst with this syntax: `$ENVIRONMENT` or `''${VARIABLE}`. This is useful to avoid putting secrets into the nix store. ''; }; verbose = mkOption { type = types.enum ["CRITICAL" "ERROR" "WARNING" "INFO" "DEBUG"]; default = "WARNING"; description = "Verbosity level."; }; device = mkOption { type = types.str; description = "Device name to configure gateway to use."; }; name = mkOption { type = with types; nullOr str; default = null; description = '' Name for the device. Supported variables: * `{ip}` IP address * `{id}` The ID of the connected usb-dongle or core-module `null` can be used for automatic detection from gateway firmware. ''; }; mqtt = { host = mkOption { type = types.str; default = "127.0.0.1"; description = "Host where MQTT server is running."; }; port = mkOption { type = types.port; default = 1883; description = "Port of MQTT server."; }; username = mkOption { type = with types; nullOr str; default = null; description = "MQTT server access username."; }; password = mkOption { type = with types; nullOr str; default = null; description = "MQTT server access password."; }; cafile = mkOption { type = with types; nullOr str; default = null; description = "Certificate Authority file for MQTT server access."; }; certfile = mkOption { type = with types; nullOr str; default = null; description = "Certificate file for MQTT server access."; }; keyfile = mkOption { type = with types; nullOr str; default = null; description = "Key file for MQTT server access."; }; }; retainNodeMessages = mkOption { type = types.bool; default = false; description = "Specify that node messages should be retaied in MQTT broker."; }; qosNodeMessages = mkOption { type = types.int; default = 1; description = "Set the guarantee of MQTT message delivery."; }; baseTopicPrefix = mkOption { type = types.str; default = ""; description = "Topic prefix added to all MQTT messages."; }; automaticRemoveKitFromNames = mkOption { type = types.bool; default = true; description = "Automatically remove kits."; }; automaticRenameKitNodes = mkOption { type = types.bool; default = true; description = "Automatically rename kit's nodes."; }; automaticRenameGenericNodes = mkOption { type = types.bool; default = true; description = "Automatically rename generic nodes."; }; automaticRenameNodes = mkOption { type = types.bool; default = true; description = "Automatically rename all nodes."; }; rename = mkOption { type = with types; attrsOf str; default = {}; description = "Rename nodes to different name."; }; }; }; config = mkIf cfg.enable { environment.systemPackages = with pkgs; [ python3Packages.bcg python3Packages.bch ]; systemd.services.bcg = let envConfig = cfg.environmentFiles != []; finalConfig = if envConfig then "\${RUNTIME_DIRECTORY}/bcg.config.yaml" else configFile; in { description = "BigClown Gateway"; wantedBy = [ "multi-user.target" ]; wants = [ "network-online.target" ] ++ lib.optional config.services.mosquitto.enable "mosquitto.service"; after = [ "network-online.target" ]; preStart = mkIf envConfig '' umask 077 ${pkgs.envsubst}/bin/envsubst -i "${configFile}" -o "${finalConfig}" ''; serviceConfig = { EnvironmentFile = cfg.environmentFiles; ExecStart = "${cfg.package}/bin/bcg -c ${finalConfig} -v ${cfg.verbose}"; RuntimeDirectory = "bcg"; }; }; }; }