161 lines
4.2 KiB
Nix
161 lines
4.2 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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pluginPath = lib.concatStringsSep ":" cfg.plugins;
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havePluginPath = lib.length cfg.plugins > 0;
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ops = lib.optionalString;
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verbosityFlag = {
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debug = "--debug";
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info = "--verbose";
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warn = ""; # intentionally empty
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error = "--quiet";
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fatal = "--silent";
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}."${cfg.logLevel}";
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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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type = types.bool;
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default = false;
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description = "Enable logstash.";
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};
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package = mkOption {
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type = types.package;
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default = pkgs.logstash;
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defaultText = "pkgs.logstash";
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example = literalExample "pkgs.logstash";
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description = "Logstash package to use.";
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};
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plugins = mkOption {
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type = types.listOf types.path;
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default = [ ];
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example = literalExample "[ pkgs.logstash-contrib ]";
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description = "The paths to find other logstash plugins in.";
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};
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logLevel = mkOption {
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type = types.enum [ "debug" "info" "warn" "error" "fatal" ];
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default = "warn";
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description = "Logging verbosity level.";
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};
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watchdogTimeout = mkOption {
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type = types.int;
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default = 10;
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description = "Set watchdog timeout value in seconds.";
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};
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filterWorkers = mkOption {
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type = types.int;
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default = 1;
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description = "The quantity of filter workers to run.";
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};
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enableWeb = mkOption {
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type = types.bool;
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default = false;
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description = "Enable the logstash web interface.";
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};
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address = mkOption {
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type = types.str;
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default = "0.0.0.0";
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description = "Address on which to start webserver.";
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};
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port = mkOption {
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type = types.str;
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default = "9292";
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description = "Port on which to start webserver.";
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};
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inputConfig = mkOption {
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type = types.lines;
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default = ''stdin { type => "example" }'';
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description = "Logstash input configuration.";
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example = literalExample ''
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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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type = types.lines;
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default = ''noop {}'';
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description = "logstash filter configuration.";
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example = literalExample ''
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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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type = types.lines;
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default = literalExample ''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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environment = { JAVA_HOME = jre; };
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path = [ pkgs.bash ];
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serviceConfig = {
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ExecStart =
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"${cfg.package}/bin/logstash agent " +
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"-w ${toString cfg.filterWorkers} " +
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ops havePluginPath "--pluginpath ${pluginPath} " +
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"${verbosityFlag} " +
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"--watchdog-timeout ${toString cfg.watchdogTimeout} " +
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"-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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ops cfg.enableWeb "-- web -a ${cfg.address} -p ${cfg.port}";
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};
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};
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};
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}
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