nixos/influxdb2: init

nixos/modules/services/databases/influxdb2.nix

@@ -0,0 +1,53 @@
+{ config, lib, pkgs, ... }:
+with lib;
+let
+  format = pkgs.formats.json { };
+  cfg = config.services.influxdb2;
+  configFile = format.generate "config.json" cfg.settings;
+in
+{
+  options = {
+    services.influxdb2 = {
+      enable = mkEnableOption "the influxdb2 server";
+      package = mkOption {
+        default = pkgs.influxdb2;
+        defaultText = "pkgs.influxdb2";
+        description = "influxdb2 derivation to use.";
+        type = types.package;
+      };
+      settings = mkOption {
+        default = { };
+        description = "configuration options for influxdb2, see https://docs.influxdata.com/influxdb/v2.0/reference/config-options for details.";
+        type = format.type;
+      };
+    };
+  };
+
+  config = mkIf cfg.enable {
+    assertions = [{
+      assertion = !(builtins.hasAttr "bolt-path" cfg.settings) && !(builtins.hasAttr "engine-path" cfg.settings);
+      message = "services.influxdb2.config: bolt-path and engine-path should not be set as they are managed by systemd";
+    }];
+    systemd.services.influxdb2 = {
+      description = "InfluxDB is an open-source, distributed, time series database";
+      documentation = [ "https://docs.influxdata.com/influxdb/" ];
+      wantedBy = [ "multi-user.target" ];
+      after = [ "network.target" ];
+      environment = {
+        INFLUXD_CONFIG_PATH = "${configFile}";
+      };
+      serviceConfig = {
+        ExecStart = "${cfg.package}/bin/influxd --bolt-path \${STATE_DIRECTORY}/influxd.bolt --engine-path \${STATE_DIRECTORY}/engine";
+        StateDirectory = "influxdb2";
+        DynamicUser = true;
+        CapabilityBoundingSet = "";
+        SystemCallFilter = "@system-service";
+        LimitNOFILE = 65536;
+        KillMode = "control-group";
+        Restart = "on-failure";
+      };
+    };
+  };
+
+  meta.maintainers = with lib.maintainers; [ nickcao ];
+}