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|
{ options, config, lib, pkgs, ... }:
with lib;
let
cfg = config.services.kapacitor;
kapacitorConf = pkgs.writeTextFile {
name = "kapacitord.conf";
text = ''
hostname="${config.networking.hostName}"
data_dir="${cfg.dataDir}"
[http]
bind-address = "${cfg.bind}:${toString cfg.port}"
log-enabled = false
auth-enabled = false
[task]
dir = "${cfg.dataDir}/tasks"
snapshot-interval = "${cfg.taskSnapshotInterval}"
[replay]
dir = "${cfg.dataDir}/replay"
[storage]
boltdb = "${cfg.dataDir}/kapacitor.db"
${optionalString (cfg.loadDirectory != null) ''
[load]
enabled = true
dir = "${cfg.loadDirectory}"
''}
${optionalString (cfg.defaultDatabase.enable) ''
[[influxdb]]
name = "default"
enabled = true
default = true
urls = [ "${cfg.defaultDatabase.url}" ]
username = "${cfg.defaultDatabase.username}"
password = "${cfg.defaultDatabase.password}"
''}
${cfg.extraConfig}
'';
};
in
{
options.services.kapacitor = {
enable = mkEnableOption "kapacitor";
dataDir = mkOption {
type = types.path;
example = "/var/lib/kapacitor";
default = "/var/lib/kapacitor";
description = "Location where Kapacitor stores its state";
};
port = mkOption {
type = types.int;
default = 9092;
description = "Port of Kapacitor";
};
bind = mkOption {
type = types.str;
default = "";
example = literalExample "0.0.0.0";
description = "Address to bind to. The default is to bind to all addresses";
};
extraConfig = mkOption {
description = "These lines go into kapacitord.conf verbatim.";
default = "";
type = types.lines;
};
user = mkOption {
type = types.str;
default = "kapacitor";
description = "User account under which Kapacitor runs";
};
group = mkOption {
type = types.str;
default = "kapacitor";
description = "Group under which Kapacitor runs";
};
taskSnapshotInterval = mkOption {
type = types.str;
description = "Specifies how often to snapshot the task state (in InfluxDB time units)";
default = "1m0s";
example = "1m0s";
};
loadDirectory = mkOption {
type = types.nullOr types.path;
description = "Directory where to load services from, such as tasks, templates and handlers (or null to disable service loading on startup)";
default = null;
};
defaultDatabase = {
enable = mkEnableOption "kapacitor.defaultDatabase";
url = mkOption {
description = "The URL to an InfluxDB server that serves as the default database";
example = "http://localhost:8086";
type = types.string;
};
username = mkOption {
description = "The username to connect to the remote InfluxDB server";
type = types.string;
};
password = mkOption {
description = "The password to connect to the remote InfluxDB server";
type = types.string;
};
};
};
config = mkIf cfg.enable {
environment.systemPackages = [ pkgs.kapacitor ];
systemd.services.kapacitor = {
description = "Kapacitor Real-Time Stream Processing Engine";
wantedBy = [ "multi-user.target" ];
after = [ "networking.target" ];
serviceConfig = {
ExecStart = "${pkgs.kapacitor}/bin/kapacitord -config ${kapacitorConf}";
User = "kapacitor";
Group = "kapacitor";
PermissionsStartOnly = true;
};
preStart = ''
mkdir -p ${cfg.dataDir}
chown ${cfg.user}:${cfg.group} ${cfg.dataDir}
'';
};
users.users.kapacitor = {
uid = config.ids.uids.kapacitor;
description = "Kapacitor user";
home = cfg.dataDir;
};
users.groups.kapacitor = {
gid = config.ids.gids.kapacitor;
};
};
}
|