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;
configFile = builtins.toFile "loop.conf" ''
datadir=${cfg.dataDir}
logdir=${cfg.dataDir}/logs
tlscertpath=${secretsDir}/loop-cert
tlskeypath=${secretsDir}/loop-key
lnd.host=${builtins.elemAt config.services.lnd.rpclisten 0}:${toString config.services.lnd.rpcPort}
lnd.macaroondir=${config.services.lnd.dataDir}/chain/bitcoin/mainnet
lnd.tlspath=${secretsDir}/lnd-cert
${optionalString (cfg.proxy != null) "server.proxy=${cfg.proxy}"}
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${cfg.extraConfig}
'';
in {
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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.";
};
dataDir = mkOption {
type = types.path;
default = "/var/lib/lightning-loop";
description = "The data directory for lightning-loop.";
};
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proxy = mkOption {
type = types.nullOr types.str;
default = null;
description = "host:port of SOCKS5 proxy for connnecting to the loop server.";
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};
extraConfig = mkOption {
type = types.lines;
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default = "";
example = ''
debuglevel=trace
'';
description = "Extra lines appended to the configuration file.";
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};
cli = mkOption {
default = pkgs.writeScriptBin "loop" ''
${cfg.cliExec} ${cfg.package}/bin/loop --tlscertpath ${secretsDir}/loop-cert "$@"
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'';
description = "Binary to connect with the lightning-loop instance.";
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};
inherit (nix-bitcoin-services) cliExec;
enforceTor = nix-bitcoin-services.enforceTor;
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};
config = mkIf cfg.enable {
assertions = [
{ assertion = config.services.lnd.enable;
message = "lightning-loop requires lnd.";
}
];
environment.systemPackages = [ cfg.package (hiPrio cfg.cli) ];
systemd.tmpfiles.rules = [
"d '${cfg.dataDir}' 0770 lnd lnd - -"
];
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systemd.services.lightning-loop = {
wantedBy = [ "multi-user.target" ];
requires = [ "lnd.service" ];
after = [ "lnd.service" ];
serviceConfig = nix-bitcoin-services.defaultHardening // {
ExecStart = "${cfg.package}/bin/loopd --configfile=${configFile}";
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User = "lnd";
Restart = "on-failure";
RestartSec = "10s";
ReadWritePaths = "${cfg.dataDir}";
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} // (if cfg.enforceTor
then nix-bitcoin-services.allowTor
else nix-bitcoin-services.allowAnyIP);
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};
nix-bitcoin.secrets = {
loop-key.user = "lnd";
loop-cert.user = "lnd";
};
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};
}