nix-bitcoin/modules/electrs.nix

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{ config, lib, pkgs, ... }:
with lib;
let
cfg = config.services.electrs;
inherit (config) nix-bitcoin-services;
secretsDir = config.nix-bitcoin.secretsDir;
in {
imports = [
(mkRenamedOptionModule [ "services" "electrs" "nginxport" ] [ "services" "electrs" "TLSProxy" "port" ])
];
options.services.electrs = {
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enable = mkEnableOption "electrs";
dataDir = mkOption {
type = types.path;
default = "/var/lib/electrs";
description = "The data directory for 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.";
};
high-memory = mkOption {
type = types.bool;
default = false;
description = ''
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If enabled, the electrs service will sync faster on high-memory systems ( 8GB).
'';
};
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address = mkOption {
type = types.str;
default = "127.0.0.1";
description = "RPC listening address.";
};
port = mkOption {
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type = types.ints.u16;
default = 50001;
description = "RPC port.";
};
extraArgs = mkOption {
type = types.separatedString " ";
default = "";
description = "Extra command line arguments passed to electrs.";
};
TLSProxy = {
enable = mkEnableOption "Nginx TLS proxy";
port = mkOption {
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type = types.ints.u16;
default = 50003;
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description = "Port on which to listen for TLS client connections.";
};
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};
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enforceTor = nix-bitcoin-services.enforceTor;
};
config = mkIf cfg.enable (mkMerge [{
environment.systemPackages = [ pkgs.nix-bitcoin.electrs ];
systemd.services.electrs = {
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description = "Electrs Electrum Server";
wantedBy = [ "multi-user.target" ];
requires = [ "bitcoind.service" ];
after = [ "bitcoind.service" ];
preStart = ''
mkdir -m 0770 -p ${cfg.dataDir}
chown -R '${cfg.user}:${cfg.group}' ${cfg.dataDir}
echo "cookie = \"${config.services.bitcoind.rpcuser}:$(cat ${secretsDir}/bitcoin-rpcpassword)\"" \
> electrs.toml
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'';
serviceConfig = nix-bitcoin-services.defaultHardening // {
RuntimeDirectory = "electrs";
RuntimeDirectoryMode = "700";
WorkingDirectory = "/run/electrs";
PermissionsStartOnly = "true";
ExecStart = ''
${pkgs.nix-bitcoin.electrs}/bin/electrs -vvv \
${if cfg.high-memory then
traceIf (!config.services.bitcoind.dataDirReadableByGroup) ''
Warning: For optimal electrs syncing performance, enable services.bitcoind.dataDirReadableByGroup.
Note that this disables wallet support in bitcoind.
'' ""
else
"--jsonrpc-import --index-batch-size=10"
} \
--db-dir '${cfg.dataDir}' --daemon-dir '${config.services.bitcoind.dataDir}' \
--electrum-rpc-addr=${toString cfg.address}:${toString cfg.port} ${cfg.extraArgs}
'';
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User = cfg.user;
Group = cfg.group;
Restart = "on-failure";
RestartSec = "10s";
} // (if cfg.enforceTor
then nix-bitcoin-services.allowTor
else nix-bitcoin-services.allowAnyIP
);
};
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users.users.${cfg.user} = {
description = "electrs User";
group = cfg.group;
extraGroups = optionals cfg.high-memory [ "bitcoin" ];
};
users.groups.${cfg.group} = {};
}
(mkIf cfg.TLSProxy.enable {
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services.nginx = {
enable = true;
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appendConfig = let
address =
if cfg.address == "0.0.0.0" then
"127.0.0.1"
else if cfg.address == "::" then
"::1"
else
cfg.address;
in ''
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stream {
upstream electrs {
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server ${address}:${toString cfg.port};
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}
server {
listen ${toString cfg.TLSProxy.port} ssl;
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proxy_pass electrs;
ssl_certificate ${secretsDir}/nginx-cert;
ssl_certificate_key ${secretsDir}/nginx-key;
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ssl_session_cache shared:SSL:1m;
ssl_session_timeout 4h;
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ssl_protocols TLSv1.2 TLSv1.3;
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ssl_prefer_server_ciphers on;
}
}
'';
};
systemd.services = {
electrs.wants = [ "nginx.service" ];
nginx = {
requires = [ "nix-bitcoin-secrets.target" ];
after = [ "nix-bitcoin-secrets.target" ];
};
};
nix-bitcoin.secrets = rec {
nginx-key = {
user = "nginx";
group = "root";
};
nginx-cert = nginx-key;
};
})
]);
}