nixpkgs/nixos/modules/services/misc/apache-kafka.nix
pennae 2e751c0772 treewide: automatically md-convert option descriptions
the conversion procedure is simple:

 - find all things that look like options, ie calls to either `mkOption`
   or `lib.mkOption` that take an attrset. remember the attrset as the
   option
 - for all options, find a `description` attribute who's value is not a
   call to `mdDoc` or `lib.mdDoc`
 - textually convert the entire value of the attribute to MD with a few
   simple regexes (the set from mdize-module.sh)
 - if the change produced a change in the manual output, discard
 - if the change kept the manual unchanged, add some text to the
   description to make sure we've actually found an option. if the
   manual changes this time, keep the converted description

this procedure converts 80% of nixos options to markdown. around 2000
options remain to be inspected, but most of those fail the "does not
change the manual output check": currently the MD conversion process
does not faithfully convert docbook tags like <code> and <package>, so
any option using such tags will not be converted at all.
2022-07-30 15:16:34 +02:00

152 lines
4.0 KiB
Nix

{ config, lib, pkgs, ... }:
with lib;
let
cfg = config.services.apache-kafka;
serverProperties =
if cfg.serverProperties != null then
cfg.serverProperties
else
''
# Generated by nixos
broker.id=${toString cfg.brokerId}
port=${toString cfg.port}
host.name=${cfg.hostname}
log.dirs=${concatStringsSep "," cfg.logDirs}
zookeeper.connect=${cfg.zookeeper}
${toString cfg.extraProperties}
'';
serverConfig = pkgs.writeText "server.properties" serverProperties;
logConfig = pkgs.writeText "log4j.properties" cfg.log4jProperties;
in {
options.services.apache-kafka = {
enable = mkOption {
description = lib.mdDoc "Whether to enable Apache Kafka.";
default = false;
type = types.bool;
};
brokerId = mkOption {
description = lib.mdDoc "Broker ID.";
default = -1;
type = types.int;
};
port = mkOption {
description = lib.mdDoc "Port number the broker should listen on.";
default = 9092;
type = types.int;
};
hostname = mkOption {
description = lib.mdDoc "Hostname the broker should bind to.";
default = "localhost";
type = types.str;
};
logDirs = mkOption {
description = lib.mdDoc "Log file directories";
default = [ "/tmp/kafka-logs" ];
type = types.listOf types.path;
};
zookeeper = mkOption {
description = lib.mdDoc "Zookeeper connection string";
default = "localhost:2181";
type = types.str;
};
extraProperties = mkOption {
description = lib.mdDoc "Extra properties for server.properties.";
type = types.nullOr types.lines;
default = null;
};
serverProperties = mkOption {
description = lib.mdDoc ''
Complete server.properties content. Other server.properties config
options will be ignored if this option is used.
'';
type = types.nullOr types.lines;
default = null;
};
log4jProperties = mkOption {
description = lib.mdDoc "Kafka log4j property configuration.";
default = ''
log4j.rootLogger=INFO, stdout
log4j.appender.stdout=org.apache.log4j.ConsoleAppender
log4j.appender.stdout.layout=org.apache.log4j.PatternLayout
log4j.appender.stdout.layout.ConversionPattern=[%d] %p %m (%c)%n
'';
type = types.lines;
};
jvmOptions = mkOption {
description = lib.mdDoc "Extra command line options for the JVM running Kafka.";
default = [];
type = types.listOf types.str;
example = [
"-Djava.net.preferIPv4Stack=true"
"-Dcom.sun.management.jmxremote"
"-Dcom.sun.management.jmxremote.local.only=true"
];
};
package = mkOption {
description = lib.mdDoc "The kafka package to use";
default = pkgs.apacheKafka;
defaultText = literalExpression "pkgs.apacheKafka";
type = types.package;
};
jre = mkOption {
description = lib.mdDoc "The JRE with which to run Kafka";
default = cfg.package.passthru.jre;
defaultText = literalExpression "pkgs.apacheKafka.passthru.jre";
type = types.package;
};
};
config = mkIf cfg.enable {
environment.systemPackages = [cfg.package];
users.users.apache-kafka = {
isSystemUser = true;
group = "apache-kafka";
description = "Apache Kafka daemon user";
home = head cfg.logDirs;
};
users.groups.apache-kafka = {};
systemd.tmpfiles.rules = map (logDir: "d '${logDir}' 0700 apache-kafka - - -") cfg.logDirs;
systemd.services.apache-kafka = {
description = "Apache Kafka Daemon";
wantedBy = [ "multi-user.target" ];
after = [ "network.target" ];
serviceConfig = {
ExecStart = ''
${cfg.jre}/bin/java \
-cp "${cfg.package}/libs/*" \
-Dlog4j.configuration=file:${logConfig} \
${toString cfg.jvmOptions} \
kafka.Kafka \
${serverConfig}
'';
User = "apache-kafka";
SuccessExitStatus = "0 143";
};
};
};
}