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