{
config,
lib,
pkgs,
...
}:
let
cfg = config.services.statsd;
isBuiltinBackend =
name:
builtins.elem name [
"graphite"
"console"
"repeater"
];
backendsToPackages =
mkMap = list: name: if isBuiltinBackend name then list else list ++ [ pkgs.nodePackages.${name} ];
in
lib.foldl mkMap [ ];
configFile = pkgs.writeText "statsd.conf" ''
address: "${cfg.listenAddress}",
port: "${toString cfg.port}",
mgmt_address: "${cfg.mgmt_address}",
mgmt_port: "${toString cfg.mgmt_port}",
backends: [${
lib.concatMapStringsSep "," (
name: if (isBuiltinBackend name) then ''"./backends/${name}"'' else ''"${name}"''
) cfg.backends
}],
${lib.optionalString (cfg.graphiteHost != null) ''graphiteHost: "${cfg.graphiteHost}",''}
${lib.optionalString (cfg.graphitePort != null) ''graphitePort: "${toString cfg.graphitePort}",''}
console: {
prettyprint: false
},
log: {
backend: "stdout"
automaticConfigReload: false${lib.optionalString (cfg.extraConfig != null) ","}
${cfg.extraConfig}
}
'';
deps = pkgs.buildEnv {
name = "statsd-runtime-deps";
pathsToLink = [ "/lib" ];
ignoreCollisions = true;
paths = backendsToPackages cfg.backends;
};
###### interface
options.services.statsd = {
enable = lib.mkEnableOption "statsd";
listenAddress = lib.mkOption {
description = "Address that statsd listens on over UDP";
default = "127.0.0.1";
type = lib.types.str;
port = lib.mkOption {
description = "Port that stats listens for messages on over UDP";
default = 8125;
type = lib.types.int;
mgmt_address = lib.mkOption {
description = "Address to run management TCP interface on";
mgmt_port = lib.mkOption {
description = "Port to run the management TCP interface on";
default = 8126;
backends = lib.mkOption {
description = "List of backends statsd will use for data persistence";
default = [ ];
example = [
"statsd-librato-backend"
"statsd-influxdb-backend"
type = lib.types.listOf lib.types.str;
graphiteHost = lib.mkOption {
description = "Hostname or IP of Graphite server";
default = null;
type = lib.types.nullOr lib.types.str;
graphitePort = lib.mkOption {
description = "Port of Graphite server (i.e. carbon-cache).";
type = lib.types.nullOr lib.types.int;
extraConfig = lib.mkOption {
description = "Extra configuration options for statsd";
default = "";
###### implementation
config = lib.mkIf cfg.enable {
assertions = map (backend: {
assertion = !isBuiltinBackend backend -> lib.hasAttrByPath [ backend ] pkgs.nodePackages;
message = "Only builtin backends (graphite, console, repeater) or backends enumerated in `pkgs.nodePackages` are allowed!";
}) cfg.backends;
users.users.statsd = {
uid = config.ids.uids.statsd;
description = "Statsd daemon user";
systemd.services.statsd = {
description = "Statsd Server";
wantedBy = [ "multi-user.target" ];
environment = {
NODE_PATH = "${deps}/lib/node_modules";
serviceConfig = {
ExecStart = "${pkgs.statsd}/bin/statsd ${configFile}";
User = "statsd";
environment.systemPackages = [ pkgs.statsd ];