29027fd1e1
Using pkgs.lib on the spine of module evaluation is problematic because the pkgs argument depends on the result of module evaluation. To prevent an infinite recursion, pkgs and some of the modules are evaluated twice, which is inefficient. Using ‘with lib’ prevents this problem.
86 lines
2.0 KiB
Nix
86 lines
2.0 KiB
Nix
{ config, lib, pkgs, ... }:
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with lib;
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let
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cfg = config.services.logstash;
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in
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{
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###### interface
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options = {
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services.logstash = {
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enable = mkOption {
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default = false;
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description = "Enable logstash";
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};
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inputConfig = mkOption {
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default = ''stdin { type => "example" }'';
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description = "Logstash input configuration";
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example = ''
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# Read from journal
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pipe {
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command => "${pkgs.systemd}/bin/journalctl -f -o json"
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type => "syslog" codec => json {}
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}
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'';
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};
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filterConfig = mkOption {
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default = ''noop {}'';
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description = "logstash filter configuration";
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example = ''
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if [type] == "syslog" {
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# Keep only relevant systemd fields
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# http://www.freedesktop.org/software/systemd/man/systemd.journal-fields.html
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prune {
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whitelist_names => [
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"type", "@timestamp", "@version",
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"MESSAGE", "PRIORITY", "SYSLOG_FACILITY",
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]
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}
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}
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'';
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};
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outputConfig = mkOption {
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default = ''stdout { debug => true debug_format => "json"}'';
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description = "Logstash output configuration";
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example = ''
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redis { host => "localhost" data_type => "list" key => "logstash" codec => json }
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elasticsearch { embedded => true }
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'';
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};
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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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systemd.services.logstash = with pkgs; {
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description = "Logstash daemon";
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wantedBy = [ "multi-user.target" ];
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serviceConfig = {
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ExecStart = "${jre}/bin/java -jar ${logstash} agent -f ${writeText "logstash.conf" ''
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input {
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${cfg.inputConfig}
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}
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filter {
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${cfg.filterConfig}
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}
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output {
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${cfg.outputConfig}
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}
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''}";
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};
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};
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};
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}
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