{ pkgs, ... }:
let

  perlEnv = pkgs.perl.withPackages (p: [ p.NetZooKeeper ]);

in
{
  name = "zookeeper";
  meta = with pkgs.lib.maintainers; {
    maintainers = [
      ztzg
    ];
  };

  nodes = {
    server =
      { ... }:
      {
        services.zookeeper = {
          enable = true;
        };

        networking.firewall.allowedTCPPorts = [ 2181 ];
      };
  };

  testScript = ''
    start_all()

    server.wait_for_unit("zookeeper")
    server.wait_for_unit("network.target")
    server.wait_for_open_port(2181)

    server.wait_until_succeeds(
        "${pkgs.zookeeper}/bin/zkCli.sh -server localhost:2181 create /foo bar"
    )
    server.wait_until_succeeds(
        "${pkgs.zookeeper}/bin/zkCli.sh -server localhost:2181 set /foo hello"
    )
    server.wait_until_succeeds(
        "${pkgs.zookeeper}/bin/zkCli.sh -server localhost:2181 get /foo | grep hello"
    )

    server.wait_until_succeeds(
        "${perlEnv}/bin/perl -E 'use Net::ZooKeeper qw(:acls); $z=Net::ZooKeeper->new(q(localhost:2181)); $z->create(qw(/perl foo acl), ZOO_OPEN_ACL_UNSAFE) || die $z->get_error()'"
    )
    server.wait_until_succeeds(
        "${perlEnv}/bin/perl -E 'use Net::ZooKeeper qw(:acls); $z=Net::ZooKeeper->new(q(localhost:2181)); $z->get(qw(/perl)) eq qw(foo) || die $z->get_error()'"
    )
  '';
}
