import ../make-test-python.nix ({ lib, pkgs, ... }:

{
  name = "prometheus-federation";

  nodes = {
    global1 = { config, pkgs, ... }: {
      environment.systemPackages = [ pkgs.jq ];

      networking.firewall.allowedTCPPorts = [ config.services.prometheus.port ];

      services.prometheus = {
        enable = true;
        globalConfig.scrape_interval = "2s";

        scrapeConfigs = [
          {
            job_name = "federate";
            honor_labels = true;
            metrics_path = "/federate";

            params = {
              "match[]" = [
                "{job=\"node\"}"
                "{job=\"prometheus\"}"
              ];
            };

            static_configs = [
              {
                targets = [
                  "prometheus1:${toString config.services.prometheus.port}"
                  "prometheus2:${toString config.services.prometheus.port}"
                ];
              }
            ];
          }
          {
            job_name = "prometheus";
            static_configs = [
              {
                targets = [
                  "global1:${toString config.services.prometheus.port}"
                  "global2:${toString config.services.prometheus.port}"
                ];
              }
            ];
          }
        ];
      };
    };

    global2 = { config, pkgs, ... }: {
      environment.systemPackages = [ pkgs.jq ];

      networking.firewall.allowedTCPPorts = [ config.services.prometheus.port ];

      services.prometheus = {
        enable = true;
        globalConfig.scrape_interval = "2s";

        scrapeConfigs = [
          {
            job_name = "federate";
            honor_labels = true;
            metrics_path = "/federate";

            params = {
              "match[]" = [
                "{job=\"node\"}"
                "{job=\"prometheus\"}"
              ];
            };

            static_configs = [
              {
                targets = [
                  "prometheus1:${toString config.services.prometheus.port}"
                  "prometheus2:${toString config.services.prometheus.port}"
                ];
              }
            ];
          }
          {
            job_name = "prometheus";
            static_configs = [
              {
                targets = [
                  "global1:${toString config.services.prometheus.port}"
                  "global2:${toString config.services.prometheus.port}"
                ];
              }
            ];
          }
        ];
      };
    };

    prometheus1 = { config, pkgs, ... }: {
      environment.systemPackages = [ pkgs.jq ];

      networking.firewall.allowedTCPPorts = [ config.services.prometheus.port ];

      services.prometheus = {
        enable = true;
        globalConfig.scrape_interval = "2s";

        scrapeConfigs = [
          {
            job_name = "node";
            static_configs = [
              {
                targets = [
                  "node1:${toString config.services.prometheus.exporters.node.port}"
                ];
              }
            ];
          }
          {
            job_name = "prometheus";
            static_configs = [
              {
                targets = [
                  "prometheus1:${toString config.services.prometheus.port}"
                ];
              }
            ];
          }
        ];
      };
    };

    prometheus2 = { config, pkgs, ... }: {
      environment.systemPackages = [ pkgs.jq ];

      networking.firewall.allowedTCPPorts = [ config.services.prometheus.port ];

      services.prometheus = {
        enable = true;
        globalConfig.scrape_interval = "2s";

        scrapeConfigs = [
          {
            job_name = "node";
            static_configs = [
              {
                targets = [
                  "node2:${toString config.services.prometheus.exporters.node.port}"
                ];
              }
            ];
          }
          {
            job_name = "prometheus";
            static_configs = [
              {
                targets = [
                  "prometheus2:${toString config.services.prometheus.port}"
                ];
              }
            ];
          }
        ];
      };
    };

    node1 = { config, pkgs, ... }: {
      services.prometheus.exporters.node = {
        enable = true;
        openFirewall = true;
      };
    };

    node2 = { config, pkgs, ... }: {
      services.prometheus.exporters.node = {
        enable = true;
        openFirewall = true;
      };
    };
  };

  testScript = ''
    for machine in node1, node2:
      machine.wait_for_unit("prometheus-node-exporter")
      machine.wait_for_open_port(9100)

    for machine in prometheus1, prometheus2, global1, global2:
      machine.wait_for_unit("prometheus")
      machine.wait_for_open_port(9090)

    # Verify both servers got the same data from the exporter
    for machine in prometheus1, prometheus2:
      machine.wait_until_succeeds(
        "curl -sf 'http://127.0.0.1:9090/api/v1/query?query=count(up\{job=\"node\"\})' | "
        + "jq '.data.result[0].value[1]' | grep '\"1\"'"
      )
      machine.wait_until_succeeds(
        "curl -sf 'http://127.0.0.1:9090/api/v1/query?query=count(prometheus_build_info)' | "
        + "jq '.data.result[0].value[1]' | grep '\"1\"'"
      )

    for machine in global1, global2:
      machine.wait_until_succeeds(
        "curl -sf 'http://127.0.0.1:9090/api/v1/query?query=count(up\{job=\"node\"\})' | "
        + "jq '.data.result[0].value[1]' | grep '\"2\"'"
      )

      machine.wait_until_succeeds(
        "curl -sf 'http://127.0.0.1:9090/api/v1/query?query=count(prometheus_build_info)' | "
        + "jq '.data.result[0].value[1]' | grep '\"4\"'"
      )
  '';
})
