nix-bitcoin/modules/electrs.nix

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{ config, lib, pkgs, ... }:
with lib;
let
nix-bitcoin-services = pkgs.callPackage ./nix-bitcoin-services.nix { };
cfg = config.services.electrs;
index-batch-size = "${if cfg.high-memory then "" else "--index-batch-size=10"}";
jsonrpc-import = "${if cfg.high-memory then "" else "--jsonrpc-import"}";
in {
options.services.electrs = {
enable = mkOption {
type = types.bool;
default = false;
description = ''
If enabled, the electrs service will be installed.
'';
};
dataDir = mkOption {
type = types.path;
default = "/var/lib/electrs";
description = "The data directory for 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).
'';
};
port = mkOption {
type = types.ints.u16;
default = 50001;
description = "Override the default port on which to listen for connections.";
};
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onionport = mkOption {
type = types.ints.u16;
default = 50002;
description = "Override the default port on which to listen for connections.";
};
nginxport = mkOption {
type = types.ints.u16;
default = 50003;
description = "Override the default port on which to listen for connections.";
};
enforceTor = nix-bitcoin-services.enforceTor;
};
config = mkIf cfg.enable {
users.users.electrs = {
description = "electrs User";
group = "electrs";
extraGroups = [ "bitcoinrpc" "keys" "bitcoin"];
home = cfg.dataDir;
};
users.groups.electrs = {
name = "electrs";
};
systemd.services.electrs = {
description = "Run electrs";
wantedBy = [ "multi-user.target" ];
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requires = [ "bitcoind.service" "nginx.service"];
after = [ "bitcoind.service" ];
# create shell script to start up electrs safely with password parameter
preStart = ''
mkdir -m 0770 -p ${cfg.dataDir}
chown 'electrs:electrs' ${cfg.dataDir}
echo "${pkgs.electrs}/bin/electrs -vvv ${index-batch-size} ${jsonrpc-import} --timestamp --db-dir ${cfg.dataDir} --daemon-dir /var/lib/bitcoind --cookie=${config.services.bitcoind.rpcuser}:$(cat /secrets/bitcoin-rpcpassword) --electrum-rpc-addr=127.0.0.1:${toString cfg.port}" > /var/lib/electrs/startscript.sh
chown -R 'electrs:electrs' ${cfg.dataDir}
chmod u+x ${cfg.dataDir}/startscript.sh
'';
serviceConfig = {
PermissionsStartOnly = "true";
ExecStart = "${pkgs.bash}/bin/bash ${cfg.dataDir}/startscript.sh";
User = "electrs";
Restart = "on-failure";
RestartSec = "10s";
} // nix-bitcoin-services.defaultHardening
// (if cfg.enforceTor
then nix-bitcoin-services.allowTor
else nix-bitcoin-services.allowAnyIP
);
};
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services.nginx = {
enable = true;
appendConfig = ''
stream {
upstream electrs {
server 127.0.0.1:${toString config.services.electrs.port};
}
server {
listen ${toString config.services.electrs.nginxport} ssl;
proxy_pass electrs;
ssl_certificate /secrets/ssl_certificate;
ssl_certificate_key /secrets/ssl_certificate_key;
ssl_session_cache shared:SSL:1m;
ssl_session_timeout 4h;
ssl_protocols TLSv1 TLSv1.1 TLSv1.2 TLSv1.3;
ssl_prefer_server_ciphers on;
}
}
'';
};
};
}