{ config, lib, pkgs, ... }: with lib; let cfg = config.services.logstash; pluginPath = lib.concatStringsSep ":" cfg.plugins; havePluginPath = lib.length cfg.plugins > 0; ops = lib.optionalString; verbosityFlag = { debug = "--debug"; info = "--verbose"; warn = ""; # intentionally empty error = "--quiet"; fatal = "--silent"; }."${cfg.logLevel}"; in { ###### interface options = { services.logstash = { enable = mkOption { type = types.bool; default = false; description = "Enable logstash."; }; package = mkOption { type = types.package; default = pkgs.logstash; defaultText = "pkgs.logstash"; example = literalExample "pkgs.logstash"; description = "Logstash package to use."; }; plugins = mkOption { type = types.listOf types.path; default = [ ]; example = literalExample "[ pkgs.logstash-contrib ]"; description = "The paths to find other logstash plugins in."; }; logLevel = mkOption { type = types.enum [ "debug" "info" "warn" "error" "fatal" ]; default = "warn"; description = "Logging verbosity level."; }; filterWorkers = mkOption { type = types.int; default = 1; description = "The quantity of filter workers to run."; }; enableWeb = mkOption { type = types.bool; default = false; description = "Enable the logstash web interface."; }; address = mkOption { type = types.str; default = "0.0.0.0"; description = "Address on which to start webserver."; }; port = mkOption { type = types.str; default = "9292"; description = "Port on which to start webserver."; }; inputConfig = mkOption { type = types.lines; default = ''stdin { type => "example" }''; description = "Logstash input configuration."; example = '' # Read from journal pipe { command => "''${pkgs.systemd}/bin/journalctl -f -o json" type => "syslog" codec => json {} } ''; }; filterConfig = mkOption { type = types.lines; default = ''noop {}''; description = "logstash filter configuration."; example = '' if [type] == "syslog" { # Keep only relevant systemd fields # http://www.freedesktop.org/software/systemd/man/systemd.journal-fields.html prune { whitelist_names => [ "type", "@timestamp", "@version", "MESSAGE", "PRIORITY", "SYSLOG_FACILITY" ] } } ''; }; outputConfig = mkOption { type = types.lines; default = ''stdout { debug => true debug_format => "json"}''; description = "Logstash output configuration."; example = '' redis { host => "localhost" data_type => "list" key => "logstash" codec => json } elasticsearch { embedded => true } ''; }; }; }; ###### implementation config = mkIf cfg.enable { systemd.services.logstash = with pkgs; { description = "Logstash Daemon"; wantedBy = [ "multi-user.target" ]; environment = { JAVA_HOME = jre; }; path = [ pkgs.bash ]; serviceConfig = { ExecStart = "${cfg.package}/bin/logstash agent " + "-w ${toString cfg.filterWorkers} " + ops havePluginPath "--pluginpath ${pluginPath} " + "${verbosityFlag} " + "-f ${writeText "logstash.conf" '' input { ${cfg.inputConfig} } filter { ${cfg.filterConfig} } output { ${cfg.outputConfig} } ''} " + ops cfg.enableWeb "-- web -a ${cfg.address} -p ${cfg.port}"; }; }; }; }