{ config, lib, options, pkgs, ... }: let cfg = config.services.wasabibackend; opt = options.services.wasabibackend; inherit (lib) literalExpression mkEnableOption mkIf mkOption optionalAttrs optionalString types; confOptions = { BitcoinRpcConnectionString = "${cfg.rpc.user}:${cfg.rpc.password}"; } // optionalAttrs (cfg.network == "mainnet") { Network = "Main"; MainNetBitcoinP2pEndPoint = "${cfg.endpoint.ip}:${toString cfg.endpoint.port}"; MainNetBitcoinCoreRpcEndPoint = "${cfg.rpc.ip}:${toString cfg.rpc.port}"; } // optionalAttrs (cfg.network == "testnet") { Network = "TestNet"; TestNetBitcoinP2pEndPoint = "${cfg.endpoint.ip}:${toString cfg.endpoint.port}"; TestNetBitcoinCoreRpcEndPoint = "${cfg.rpc.ip}:${toString cfg.rpc.port}"; } // optionalAttrs (cfg.network == "regtest") { Network = "RegTest"; RegTestBitcoinP2pEndPoint = "${cfg.endpoint.ip}:${toString cfg.endpoint.port}"; RegTestBitcoinCoreRpcEndPoint = "${cfg.rpc.ip}:${toString cfg.rpc.port}"; }; configFile = pkgs.writeText "wasabibackend.conf" (builtins.toJSON confOptions); in { options = { services.wasabibackend = { enable = mkEnableOption (lib.mdDoc "Wasabi backend service"); dataDir = mkOption { type = types.path; default = "/var/lib/wasabibackend"; description = lib.mdDoc "The data directory for the Wasabi backend node."; }; customConfigFile = mkOption { type = types.nullOr types.path; default = null; description = lib.mdDoc "Defines the path to a custom configuration file that is copied to the user's directory. Overrides any config options."; }; network = mkOption { type = types.enum [ "mainnet" "testnet" "regtest" ]; default = "mainnet"; description = lib.mdDoc "The network to use for the Wasabi backend service."; }; endpoint = { ip = mkOption { type = types.str; default = "127.0.0.1"; description = lib.mdDoc "IP address for P2P connection to bitcoind."; }; port = mkOption { type = types.port; default = 8333; description = lib.mdDoc "Port for P2P connection to bitcoind."; }; }; rpc = { ip = mkOption { type = types.str; default = "127.0.0.1"; description = lib.mdDoc "IP address for RPC connection to bitcoind."; }; port = mkOption { type = types.port; default = 8332; description = lib.mdDoc "Port for RPC connection to bitcoind."; }; user = mkOption { type = types.str; default = "bitcoin"; description = lib.mdDoc "RPC user for the bitcoin endpoint."; }; password = mkOption { type = types.str; default = "password"; description = lib.mdDoc "RPC password for the bitcoin endpoint. Warning: this is stored in cleartext in the Nix store! Use `configFile` or `passwordFile` if needed."; }; passwordFile = mkOption { type = types.nullOr types.path; default = null; description = lib.mdDoc "File that contains the password of the RPC user."; }; }; user = mkOption { type = types.str; default = "wasabibackend"; description = lib.mdDoc "The user as which to run the wasabibackend node."; }; group = mkOption { type = types.str; default = cfg.user; defaultText = literalExpression "config.${opt.user}"; description = lib.mdDoc "The group as which to run the wasabibackend node."; }; }; }; config = mkIf cfg.enable { systemd.tmpfiles.rules = [ "d '${cfg.dataDir}' 0770 '${cfg.user}' '${cfg.group}' - -" ]; systemd.services.wasabibackend = { description = "wasabibackend server"; wantedBy = [ "multi-user.target" ]; after = [ "network-online.target" ]; environment = { DOTNET_PRINT_TELEMETRY_MESSAGE = "false"; DOTNET_CLI_TELEMETRY_OPTOUT = "true"; }; preStart = '' mkdir -p ${cfg.dataDir}/.walletwasabi/backend ${if cfg.customConfigFile != null then '' cp -v ${cfg.customConfigFile} ${cfg.dataDir}/.walletwasabi/backend/Config.json '' else '' cp -v ${configFile} ${cfg.dataDir}/.walletwasabi/backend/Config.json ${optionalString (cfg.rpc.passwordFile != null) '' CONFIGTMP=$(mktemp) cat ${cfg.dataDir}/.walletwasabi/backend/Config.json | ${pkgs.jq}/bin/jq --arg rpconnection "${cfg.rpc.user}:$(cat "${cfg.rpc.passwordFile}")" '. + { BitcoinRpcConnectionString: $rpconnection }' > $CONFIGTMP mv $CONFIGTMP ${cfg.dataDir}/.walletwasabi/backend/Config.json ''} ''} chmod ug+w ${cfg.dataDir}/.walletwasabi/backend/Config.json ''; serviceConfig = { User = cfg.user; Group = cfg.group; ExecStart = "${pkgs.wasabibackend}/bin/WasabiBackend"; ProtectSystem = "full"; }; }; users.users.${cfg.user} = { name = cfg.user; group = cfg.group; description = "wasabibackend daemon user"; home = cfg.dataDir; isSystemUser = true; }; users.groups.${cfg.group} = {}; }; }