151 lines
4.9 KiB
Nix
151 lines
4.9 KiB
Nix
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{ lib, pkgs, config, ... }:
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with lib;
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let
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cfg = config.services.grafana-image-renderer;
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format = pkgs.formats.json { };
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configFile = format.generate "grafana-image-renderer-config.json" cfg.settings;
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in {
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options.services.grafana-image-renderer = {
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enable = mkEnableOption "grafana-image-renderer";
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chromium = mkOption {
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type = types.package;
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description = ''
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The chromium to use for image rendering.
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'';
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};
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verbose = mkEnableOption "verbosity for the service";
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provisionGrafana = mkEnableOption "Grafana configuration for grafana-image-renderer";
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settings = mkOption {
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type = types.submodule {
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freeformType = format.type;
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options = {
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service = {
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port = mkOption {
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type = types.port;
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default = 8081;
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description = ''
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The TCP port to use for the rendering server.
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'';
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};
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logging.level = mkOption {
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type = types.enum [ "error" "warning" "info" "debug" ];
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default = "info";
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description = ''
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The log-level of the <filename>grafana-image-renderer.service</filename>-unit.
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'';
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};
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};
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rendering = {
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width = mkOption {
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default = 1000;
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type = types.ints.positive;
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description = ''
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Width of the PNG used to display the alerting graph.
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'';
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};
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height = mkOption {
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default = 500;
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type = types.ints.positive;
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description = ''
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Height of the PNG used to display the alerting graph.
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'';
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};
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mode = mkOption {
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default = "default";
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type = types.enum [ "default" "reusable" "clustered" ];
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description = ''
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Rendering mode of <package>grafana-image-renderer</package>:
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<itemizedlist>
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<listitem><para><literal>default:</literal> Creates on browser-instance
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per rendering request.</para></listitem>
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<listitem><para><literal>reusable:</literal> One browser instance
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will be started and reused for each rendering request.</para></listitem>
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<listitem><para><literal>clustered:</literal> allows to precisely
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configure how many browser-instances are supposed to be used. The values
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for that mode can be declared in <literal>rendering.clustering</literal>.
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</para></listitem>
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</itemizedlist>
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'';
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};
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args = mkOption {
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type = types.listOf types.str;
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default = [ "--no-sandbox" ];
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description = ''
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List of CLI flags passed to <package>chromium</package>.
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'';
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};
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};
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};
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};
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default = {};
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description = ''
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Configuration attributes for <package>grafana-image-renderer</package>.
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See <link xlink:href="https://github.com/grafana/grafana-image-renderer/blob/ce1f81438e5f69c7fd7c73ce08bab624c4c92e25/default.json" />
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for supported values.
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'';
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};
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};
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config = mkIf cfg.enable {
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assertions = [
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{ assertion = cfg.provisionGrafana -> config.services.grafana.enable;
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message = ''
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To provision a Grafana instance to use grafana-image-renderer,
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`services.grafana.enable` must be set to `true`!
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'';
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}
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];
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services.grafana.extraOptions = mkIf cfg.provisionGrafana {
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RENDERING_SERVER_URL = "http://localhost:${toString cfg.settings.service.port}/render";
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RENDERING_CALLBACK_URL = "http://localhost:${toString config.services.grafana.port}";
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};
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services.grafana-image-renderer.chromium = mkDefault pkgs.chromium;
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services.grafana-image-renderer.settings = {
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rendering = mapAttrs (const mkDefault) {
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chromeBin = "${cfg.chromium}/bin/chromium";
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verboseLogging = cfg.verbose;
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timezone = config.time.timeZone;
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};
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services = {
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logging.level = mkIf cfg.verbose (mkDefault "debug");
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metrics.enabled = mkDefault false;
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};
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};
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systemd.services.grafana-image-renderer = {
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wantedBy = [ "multi-user.target" ];
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after = [ "network.target" ];
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description = " A Grafana backend plugin that handles rendering of panels & dashboards to PNGs using headless browser (Chromium/Chrome)";
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environment = {
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PUPPETEER_SKIP_CHROMIUM_DOWNLOAD = "true";
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};
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serviceConfig = {
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DynamicUser = true;
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PrivateTmp = true;
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ExecStart = "${pkgs.grafana-image-renderer}/bin/grafana-image-renderer server --config=${configFile}";
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Restart = "always";
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};
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};
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};
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meta.maintainers = with maintainers; [ ma27 ];
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}
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