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{ pkgs, lib, ... }:
{
  name = "fluentd";

  nodes.machine =
    { pkgs, ... }:
    {
      services.fluentd = {
        enable = true;
        config = ''
          <source>
            @type http
            port 9880
          </source>

          <match **>
            type copy
            <store>
              @type file
              format json
              path /tmp/fluentd
              symlink_path /tmp/current-log
            </store>
            <store>
              @type stdout
            </store>
          </match>
        '';
      };
    };

  testScript =
    let
      testMessage = "an example log message";

      payload = pkgs.writeText "test-message.json" (
        builtins.toJSON {
          inherit testMessage;
        }
      );
    in
    ''
      machine.start()
      machine.wait_for_unit("fluentd.service")
      machine.wait_for_open_port(9880)

      machine.succeed(
          "curl -fsSL -X POST -H 'Content-type: application/json' -d @${payload} http://localhost:9880/test.tag"
      )

      # blocking flush
      machine.succeed("systemctl stop fluentd")

      machine.succeed("grep '${testMessage}' /tmp/current-log")
    '';
}