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{ config, lib, pkgs, ... }:
with lib;
let
cfg = config.services.telegraf;
settingsFormat = pkgs.formats.toml {};
configFile = settingsFormat.generate "config.toml" cfg.extraConfig;
in {
###### interface
options = {
services.telegraf = {
enable = mkEnableOption "telegraf server";
package = mkOption {
default = pkgs.telegraf;
defaultText = literalExpression "pkgs.telegraf";
description = "Which telegraf derivation to use";
type = types.package;
};
environmentFiles = mkOption {
type = types.listOf types.path;
default = [];
example = [ "/run/keys/telegraf.env" ];
description = ''
File to load as environment file. Environment variables from this file
will be interpolated into the config file using envsubst with this
syntax: <literal>$ENVIRONMENT</literal> or <literal>''${VARIABLE}</literal>.
This is useful to avoid putting secrets into the nix store.
'';
};
extraConfig = mkOption {
default = {};
description = "Extra configuration options for telegraf";
type = settingsFormat.type;
example = {
outputs.influxdb = {
urls = ["http://localhost:8086"];
database = "telegraf";
};
inputs.statsd = {
service_address = ":8125";
delete_timings = true;
};
};
};
};
};
###### implementation
config = mkIf config.services.telegraf.enable {
systemd.services.telegraf = let
finalConfigFile = if config.services.telegraf.environmentFiles == []
then configFile
else "/var/run/telegraf/config.toml";
in {
description = "Telegraf Agent";
wantedBy = [ "multi-user.target" ];
after = [ "network-online.target" ];
serviceConfig = {
EnvironmentFile = config.services.telegraf.environmentFiles;
ExecStartPre = lib.optional (config.services.telegraf.environmentFiles != [])
(pkgs.writeShellScript "pre-start" ''
umask 077
${pkgs.envsubst}/bin/envsubst -i "${configFile}" > /var/run/telegraf/config.toml
'');
ExecStart="${cfg.package}/bin/telegraf -config ${finalConfigFile}";
ExecReload="${pkgs.coreutils}/bin/kill -HUP $MAINPID";
RuntimeDirectory = "telegraf";
User = "telegraf";
Group = "telegraf";
Restart = "on-failure";
# for ping probes
AmbientCapabilities = [ "CAP_NET_RAW" ];
};
};
users.users.telegraf = {
uid = config.ids.uids.telegraf;
group = "telegraf";
description = "telegraf daemon user";
};
users.groups.telegraf = {};
};
}
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