{ config, lib, pkgs, ... }: with lib; let options.services.electrs = { enable = mkEnableOption "electrs, an Electrum server implemented in Rust"; address = mkOption { type = types.str; default = "127.0.0.1"; description = "Address to listen for RPC connections."; }; port = mkOption { type = types.port; default = 50001; description = "Port to listen for RPC connections."; }; dataDir = mkOption { type = types.path; default = "/var/lib/electrs"; description = "The data directory for electrs."; }; monitoringPort = mkOption { type = types.port; default = 4224; description = "Prometheus monitoring port."; }; extraArgs = mkOption { type = types.separatedString " "; default = ""; description = "Extra command line arguments passed to electrs."; }; user = mkOption { type = types.str; default = "electrs"; description = "The user as which to run electrs."; }; group = mkOption { type = types.str; default = cfg.user; description = "The group as which to run electrs."; }; tor.enforce = nbLib.tor.enforce; }; cfg = config.services.electrs; nbLib = config.nix-bitcoin.lib; secretsDir = config.nix-bitcoin.secretsDir; bitcoind = config.services.bitcoind; in { inherit options; config = mkIf cfg.enable { assertions = [ { assertion = bitcoind.prune == 0; message = "electrs does not support bitcoind pruning."; } ]; services.bitcoind = { enable = true; listenWhitelisted = true; }; systemd.tmpfiles.rules = [ "d '${cfg.dataDir}' 0770 ${cfg.user} ${cfg.group} - -" ]; systemd.services.electrs = { wantedBy = [ "multi-user.target" ]; requires = [ "bitcoind.service" ]; after = [ "bitcoind.service" ]; preStart = '' echo "auth = \"${bitcoind.rpc.users.public.name}:$(cat ${secretsDir}/bitcoin-rpcpassword-public)\"" \ > electrs.toml ''; serviceConfig = nbLib.defaultHardening // { # electrs only uses the working directory for reading electrs.toml WorkingDirectory = cfg.dataDir; ExecStart = '' ${config.nix-bitcoin.pkgs.electrs}/bin/electrs \ --log-filters=INFO \ --network=${bitcoind.makeNetworkName "bitcoin" "regtest"} \ --db-dir='${cfg.dataDir}' \ --daemon-dir='${bitcoind.dataDir}' \ --electrum-rpc-addr=${cfg.address}:${toString cfg.port} \ --monitoring-addr=${cfg.address}:${toString cfg.monitoringPort} \ --daemon-rpc-addr=${nbLib.addressWithPort bitcoind.rpc.address bitcoind.rpc.port} \ --daemon-p2p-addr=${nbLib.addressWithPort bitcoind.address bitcoind.whitelistedPort} \ ${cfg.extraArgs} ''; User = cfg.user; Group = cfg.group; Restart = "on-failure"; RestartSec = "10s"; ReadWritePaths = [ cfg.dataDir ]; } // nbLib.allowedIPAddresses cfg.tor.enforce; }; users.users.${cfg.user} = { isSystemUser = true; group = cfg.group; extraGroups = [ "bitcoinrpc-public" ]; }; users.groups.${cfg.group} = {}; }; }