aaf1e1c4fb
These packages will be placed into an environment using
`backendsToPackages`. This function explicitly maps backends to
`pkgs.nodePackages.${type}` unless it's a builtin. This ensures that only
valid backends that work on NixOS are used (if not, the build already
breaks at evaluation time).
The log will be redirected to `stdout` to be able to watch the entire
output using `journalctl`.
Configuration parameters for the backends need to be set using
`services.statsd.extraConfig` as each backend has its own options and
all of them shouldn't be validated and checked explicitly and manually.
151 lines
3.6 KiB
Nix
151 lines
3.6 KiB
Nix
{ config, lib, pkgs, ... }:
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with lib;
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let
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cfg = config.services.statsd;
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isBuiltinBackend = name:
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builtins.elem name [ "graphite" "console" "repeater" ];
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backendsToPackages = let
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mkMap = list: name:
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if isBuiltinBackend name then list
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else list ++ [ pkgs.nodePackages.${name} ];
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in foldl mkMap [];
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configFile = pkgs.writeText "statsd.conf" ''
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{
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address: "${cfg.listenAddress}",
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port: "${toString cfg.port}",
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mgmt_address: "${cfg.mgmt_address}",
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mgmt_port: "${toString cfg.mgmt_port}",
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backends: [${
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concatMapStringsSep "," (name:
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if (isBuiltinBackend name)
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then ''"./backends/${name}"''
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else ''"${name}"''
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) cfg.backends}],
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${optionalString (cfg.graphiteHost!=null) ''graphiteHost: "${cfg.graphiteHost}",''}
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${optionalString (cfg.graphitePort!=null) ''graphitePort: "${toString cfg.graphitePort}",''}
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console: {
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prettyprint: false
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},
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log: {
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backend: "stdout"
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},
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automaticConfigReload: false${optionalString (cfg.extraConfig != null) ","}
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${cfg.extraConfig}
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}
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'';
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deps = pkgs.buildEnv {
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name = "statsd-runtime-deps";
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pathsToLink = [ "/lib" ];
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ignoreCollisions = true;
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paths = backendsToPackages cfg.backends;
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};
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in
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{
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###### interface
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options.services.statsd = {
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enable = mkEnableOption "statsd";
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listenAddress = mkOption {
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description = "Address that statsd listens on over UDP";
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default = "127.0.0.1";
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type = types.str;
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};
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port = mkOption {
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description = "Port that stats listens for messages on over UDP";
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default = 8125;
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type = types.int;
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};
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mgmt_address = mkOption {
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description = "Address to run management TCP interface on";
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default = "127.0.0.1";
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type = types.str;
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};
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mgmt_port = mkOption {
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description = "Port to run the management TCP interface on";
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default = 8126;
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type = types.int;
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};
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backends = mkOption {
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description = "List of backends statsd will use for data persistence";
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default = [];
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example = [
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"graphite"
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"console"
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"repeater"
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"statsd-librato-backend"
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"stackdriver-statsd-backend"
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"statsd-influxdb-backend"
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];
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type = types.listOf types.str;
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};
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graphiteHost = mkOption {
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description = "Hostname or IP of Graphite server";
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default = null;
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type = types.nullOr types.str;
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};
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graphitePort = mkOption {
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description = "Port of Graphite server (i.e. carbon-cache).";
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default = null;
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type = types.nullOr types.int;
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};
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extraConfig = mkOption {
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description = "Extra configuration options for statsd";
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default = "";
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type = types.nullOr types.str;
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};
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};
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###### implementation
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config = mkIf cfg.enable {
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assertions = map (backend: {
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assertion = !isBuiltinBackend backend -> hasAttrByPath [ backend ] pkgs.nodePackages;
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message = "Only builtin backends (graphite, console, repeater) or backends enumerated in `pkgs.nodePackages` are allowed!";
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}) cfg.backends;
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users.extraUsers = singleton {
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name = "statsd";
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uid = config.ids.uids.statsd;
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description = "Statsd daemon user";
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};
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systemd.services.statsd = {
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description = "Statsd Server";
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wantedBy = [ "multi-user.target" ];
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environment = {
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NODE_PATH = "${deps}/lib/node_modules";
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};
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serviceConfig = {
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ExecStart = "${pkgs.statsd}/bin/statsd ${configFile}";
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User = "statsd";
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};
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};
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environment.systemPackages = [ pkgs.statsd ];
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};
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}
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