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