nix-bitcoin/modules/lightning-loop.nix

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{ config, lib, pkgs, ... }:
with lib;
let
options.services.lightning-loop = {
enable = mkEnableOption "Lightning Loop, a non-custodial off/on chain bridge";
rpcAddress = mkOption {
type = types.str;
default = "localhost";
description = mdDoc "Address to listen for gRPC connections.";
};
rpcPort = mkOption {
type = types.port;
default = 11010;
description = mdDoc "Port to listen for gRPC connections.";
};
restAddress = mkOption {
type = types.str;
default = cfg.rpcAddress;
description = mdDoc "Address to listen for REST connections.";
};
restPort = mkOption {
type = types.port;
default = 8081;
description = mdDoc "Port to listen for REST connections.";
};
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package = mkOption {
type = types.package;
default = config.nix-bitcoin.pkgs.lightning-loop;
defaultText = "config.nix-bitcoin.pkgs.lightning-loop";
description = mdDoc "The package providing lightning-loop binaries.";
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};
dataDir = mkOption {
type = types.path;
default = "/var/lib/lightning-loop";
description = mdDoc "The data directory for lightning-loop.";
};
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proxy = mkOption {
type = types.nullOr types.str;
default = if cfg.tor.proxy then config.nix-bitcoin.torClientAddressWithPort else null;
description = mdDoc "`host:port` of SOCKS5 proxy for connnecting to the loop server.";
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};
certificate = {
extraIPs = mkOption {
type = with types; listOf str;
default = [];
example = [ "60.100.0.1" ];
description = mdDoc ''
Extra `subjectAltName` IPs added to the certificate.
This works the same as loop option {option}`tlsextraip`.
'';
};
extraDomains = mkOption {
type = with types; listOf str;
default = [];
example = [ "example.com" ];
description = mdDoc ''
Extra `subjectAltName` domain names added to the certificate.
This works the same as loop option {option}`tlsextradomain`.
'';
};
};
extraConfig = mkOption {
type = types.lines;
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default = "";
example = ''
debuglevel=trace
'';
description = mdDoc ''
Extra lines appended to the configuration file.
See here for all available options:
https://github.com/lightninglabs/loop/blob/11ab596080e9d36f1df43edbeba0702b25aa7457/loopd/config.go#L119
'';
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};
cli = mkOption {
default = pkgs.writers.writeBashBin "loop" ''
${cfg.package}/bin/loop \
--rpcserver ${nbLib.addressWithPort cfg.rpcAddress cfg.rpcPort} \
--macaroonpath '${cfg.dataDir}/${network}/loop.macaroon' \
--tlscertpath '${secretsDir}/loop-cert' "$@"
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'';
defaultText = "(See source)";
description = mdDoc "Binary to connect with the lightning-loop instance.";
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};
tor = nbLib.tor;
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};
cfg = config.services.lightning-loop;
nbLib = config.nix-bitcoin.lib;
secretsDir = config.nix-bitcoin.secretsDir;
lnd = config.services.lnd;
network = config.services.bitcoind.network;
configFile = builtins.toFile "loop.conf" ''
datadir=${cfg.dataDir}
network=${network}
rpclisten=${cfg.rpcAddress}:${toString cfg.rpcPort}
restlisten=${cfg.restAddress}:${toString cfg.restPort}
logdir=${cfg.dataDir}/logs
tlscertpath=${secretsDir}/loop-cert
tlskeypath=${secretsDir}/loop-key
lnd.host=${nbLib.addressWithPort lnd.rpcAddress lnd.rpcPort}
lnd.macaroonpath=${lnd.networkDir}/admin.macaroon
lnd.tlspath=${lnd.certPath}
${optionalString (cfg.proxy != null) "server.proxy=${cfg.proxy}"}
${cfg.extraConfig}
'';
in {
inherit options;
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config = mkIf cfg.enable {
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services.lnd.enable = true;
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environment.systemPackages = [ cfg.package (hiPrio cfg.cli) ];
systemd.tmpfiles.rules = [
"d '${cfg.dataDir}' 0770 ${lnd.user} ${lnd.group} - -"
];
services.lightning-loop.certificate.extraIPs = mkIf (cfg.rpcAddress != "localhost") [ "${cfg.rpcAddress}" ];
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systemd.services.lightning-loop = {
wantedBy = [ "multi-user.target" ];
requires = [ "lnd.service" ];
after = [ "lnd.service" ];
serviceConfig = nbLib.defaultHardening // {
ExecStart = "${cfg.package}/bin/loopd --configfile=${configFile}";
User = lnd.user;
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Restart = "on-failure";
RestartSec = "10s";
ReadWritePaths = [ cfg.dataDir ];
} // nbLib.allowedIPAddresses cfg.tor.enforce;
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};
nix-bitcoin.secrets = {
loop-key.user = lnd.user;
loop-cert.user = lnd.user;
};
nix-bitcoin.generateSecretsCmds.lightning-loop = ''
makeCert loop '${nbLib.mkCertExtraAltNames cfg.certificate}'
'';
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};
}