nix-bitcoin/modules/lightning-loop.nix

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{ config, lib, pkgs, ... }:
with lib;
let
cfg = config.services.lightning-loop;
inherit (config) nix-bitcoin-services;
secretsDir = config.nix-bitcoin.secretsDir;
in {
options.services.lightning-loop = {
enable = mkEnableOption "lightning-loop";
package = mkOption {
type = types.package;
default = pkgs.nix-bitcoin.lightning-loop;
defaultText = "pkgs.nix-bitcoin.lightning-loop";
description = "The package providing lightning-loop binaries.";
};
proxy = mkOption {
type = types.nullOr types.str;
default = null;
description = "Connect through SOCKS5 proxy";
};
extraArgs = mkOption {
type = types.separatedString " ";
default = "";
description = "Extra command line arguments passed to loopd.";
};
cli = mkOption {
default = pkgs.writeScriptBin "loop"
# Switch user because lnd makes datadir contents readable by user only
''
${cfg.cliExec} sudo -u lnd ${cfg.package}/bin/loop "$@"
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'';
description = "Binary to connect with the lnd instance.";
};
inherit (nix-bitcoin-services) cliExec;
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enforceTor = nix-bitcoin-services.enforceTor;
};
config = mkIf cfg.enable {
assertions = [
{ assertion = config.services.lnd.enable;
message = "lightning-loop requires lnd.";
}
];
environment.systemPackages = [ cfg.package (hiPrio cfg.cli) ];
systemd.services.lightning-loop = {
description = "Run loopd";
wantedBy = [ "multi-user.target" ];
requires = [ "lnd.service" ];
after = [ "lnd.service" ];
serviceConfig = nix-bitcoin-services.defaultHardening // {
ExecStart = ''
${cfg.package}/bin/loopd \
--lnd.host=${config.services.lnd.listen}:10009 \
--lnd.macaroondir=${config.services.lnd.dataDir}/chain/bitcoin/mainnet \
--lnd.tlspath=${secretsDir}/lnd-cert \
${optionalString (cfg.proxy != null) "--server.proxy=${cfg.proxy}"} \
${cfg.extraArgs}
'';
User = "lnd";
Restart = "on-failure";
RestartSec = "10s";
ReadWritePaths = "${config.services.lnd.dataDir}";
} // (if cfg.enforceTor
then nix-bitcoin-services.allowTor
else nix-bitcoin-services.allowAnyIP);
};
};
}