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{ config, lib, pkgs, options }:
with lib;
let
logPrefix = "services.prometheus.exporters.snmp";
cfg = config.services.prometheus.exporters.snmp;
# This ensures that we can deal with string paths, path types and
# store-path strings with context.
coerceConfigFile = file:
if (builtins.isPath file) || (lib.isStorePath file) then
file
else
(lib.warn ''
${logPrefix}: configuration file "${file}" is being copied to the nix-store.
If you would like to avoid that, please set enableConfigCheck to false.
'' /. + file);
checkConfig = file:
pkgs.runCommandLocal "checked-snmp-exporter-config.yml" {
nativeBuildInputs = [ pkgs.buildPackages.prometheus-snmp-exporter ];
} ''
ln -s ${coerceConfigFile file} $out
snmp_exporter --dry-run --config.file $out
'';
in
{
port = 9116;
extraOpts = {
configurationPath = mkOption {
type = types.nullOr types.path;
default = null;
description = lib.mdDoc ''
Path to a snmp exporter configuration file. Mutually exclusive with 'configuration' option.
'';
example = literalExpression "./snmp.yml";
};
configuration = mkOption {
type = types.nullOr types.attrs;
default = null;
description = lib.mdDoc ''
Snmp exporter configuration as nix attribute set. Mutually exclusive with 'configurationPath' option.
'';
example = {
auths.public_v2 = {
community = "public";
version = 2;
};
};
};
enableConfigCheck = mkOption {
type = types.bool;
default = true;
description = lib.mdDoc ''
Whether to run a correctness check for the configuration file. This depends
on the configuration file residing in the nix-store. Paths passed as string will
be copied to the store.
'';
};
logFormat = mkOption {
type = types.enum ["logfmt" "json"];
default = "logfmt";
description = lib.mdDoc ''
Output format of log messages.
'';
};
logLevel = mkOption {
type = types.enum ["debug" "info" "warn" "error"];
default = "info";
description = lib.mdDoc ''
Only log messages with the given severity or above.
'';
};
};
serviceOpts = let
uncheckedConfigFile = if cfg.configurationPath != null
then cfg.configurationPath
else "${pkgs.writeText "snmp-exporter-conf.yml" (builtins.toJSON cfg.configuration)}";
configFile = if cfg.enableConfigCheck then
checkConfig uncheckedConfigFile
else
uncheckedConfigFile;
in {
serviceConfig = {
ExecStart = ''
${pkgs.prometheus-snmp-exporter}/bin/snmp_exporter \
--config.file=${escapeShellArg configFile} \
--log.format=${escapeShellArg cfg.logFormat} \
--log.level=${cfg.logLevel} \
--web.listen-address=${cfg.listenAddress}:${toString cfg.port} \
${concatStringsSep " \\\n " cfg.extraFlags}
'';
};
};
}
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