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|
{ config, lib, pkgs, ... }:
with lib;
let
cfg = config.services.logstash;
atLeast54 = versionAtLeast (builtins.parseDrvName cfg.package.name).version "5.4";
pluginPath = lib.concatStringsSep ":" cfg.plugins;
havePluginPath = lib.length cfg.plugins > 0;
ops = lib.optionalString;
verbosityFlag =
if atLeast54
then "--log.level " + cfg.logLevel
else {
debug = "--debug";
info = "--verbose";
warn = ""; # intentionally empty
error = "--quiet";
fatal = "--silent";
}."${cfg.logLevel}";
pluginsPath =
if atLeast54
then "--path.plugins ${pluginPath}"
else "--pluginpath ${pluginPath}";
logstashConf = pkgs.writeText "logstash.conf" ''
input {
${cfg.inputConfig}
}
filter {
${cfg.filterConfig}
}
output {
${cfg.outputConfig}
}
'';
logstashSettingsYml = pkgs.writeText "logstash.yml" cfg.extraSettings;
logstashSettingsDir = pkgs.runCommand "logstash-settings" {inherit logstashSettingsYml;} ''
mkdir -p $out
ln -s $logstashSettingsYml $out/logstash.yml
'';
in
{
###### interface
options = {
services.logstash = {
enable = mkOption {
type = types.bool;
default = false;
description = "Enable logstash.";
};
package = mkOption {
type = types.package;
default = pkgs.logstash;
defaultText = "pkgs.logstash";
example = literalExample "pkgs.logstash";
description = "Logstash package to use.";
};
plugins = mkOption {
type = types.listOf types.path;
default = [ ];
example = literalExample "[ pkgs.logstash-contrib ]";
description = "The paths to find other logstash plugins in.";
};
dataDir = mkOption {
type = types.str;
default = "/var/lib/logstash";
description = ''
A path to directory writable by logstash that it uses to store data.
Plugins will also have access to this path.
'';
};
logLevel = mkOption {
type = types.enum [ "debug" "info" "warn" "error" "fatal" ];
default = "warn";
description = "Logging verbosity level.";
};
filterWorkers = mkOption {
type = types.int;
default = 1;
description = "The quantity of filter workers to run.";
};
enableWeb = mkOption {
type = types.bool;
default = false;
description = "Enable the logstash web interface.";
};
listenAddress = mkOption {
type = types.str;
default = "0.0.0.0";
description = "Address on which to start webserver.";
};
port = mkOption {
type = types.str;
default = "9292";
description = "Port on which to start webserver.";
};
inputConfig = mkOption {
type = types.lines;
default = ''generator { }'';
description = "Logstash input configuration.";
example = ''
# Read from journal
pipe {
command => "''${pkgs.systemd}/bin/journalctl -f -o json"
type => "syslog" codec => json {}
}
'';
};
filterConfig = mkOption {
type = types.lines;
default = "";
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 { codec => rubydebug }'';
description = "Logstash output configuration.";
example = ''
redis { host => ["localhost"] data_type => "list" key => "logstash" codec => json }
elasticsearch { }
'';
};
extraSettings = mkOption {
type = types.lines;
default = "";
description = "Extra Logstash settings in YAML format.";
example = ''
pipeline:
batch:
size: 125
delay: 5
'';
};
};
};
###### implementation
config = mkIf cfg.enable {
assertions = [
{ assertion = atLeast54 -> !cfg.enableWeb;
message = ''
The logstash web interface is only available for versions older than 5.4.
So either set services.logstash.enableWeb = false,
or set services.logstash.package to an older logstash.
'';
}
];
systemd.services.logstash = with pkgs; {
description = "Logstash Daemon";
wantedBy = [ "multi-user.target" ];
environment = { JAVA_HOME = jre; };
path = [ pkgs.bash ];
serviceConfig = {
ExecStartPre = ''${pkgs.coreutils}/bin/mkdir -p "${cfg.dataDir}" ; ${pkgs.coreutils}/bin/chmod 700 "${cfg.dataDir}"'';
ExecStart = concatStringsSep " " (filter (s: stringLength s != 0) [
"${cfg.package}/bin/logstash"
(ops (!atLeast54) "agent")
"-w ${toString cfg.filterWorkers}"
(ops havePluginPath pluginsPath)
"${verbosityFlag}"
"-f ${logstashConf}"
(ops atLeast54 "--path.settings ${logstashSettingsDir}")
(ops atLeast54 "--path.data ${cfg.dataDir}")
(ops cfg.enableWeb "-- web -a ${cfg.listenAddress} -p ${cfg.port}")
]);
};
};
};
}
|