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