From 024b431cbcf678a9e6f144020d387cd25c26ffa0 Mon Sep 17 00:00:00 2001
From: Raito Bezarius <masterancpp@gmail.com>
Date: Sat, 24 Aug 2024 11:19:33 +0200
Subject: [PATCH] feat(grafana): plug jsonnet-based dashboards in provisioning

Add the gerrit dashboards as an example.

Signed-off-by: Raito Bezarius <masterancpp@gmail.com>
---
 dashboards/default.nix               | 30 ++++++++++++++++++++++++----
 flake.lock                           |  8 ++++----
 services/monitoring/lgtm/grafana.nix |  9 +++++++++
 3 files changed, 39 insertions(+), 8 deletions(-)

diff --git a/dashboards/default.nix b/dashboards/default.nix
index 307ef9e..0803f62 100644
--- a/dashboards/default.nix
+++ b/dashboards/default.nix
@@ -1,4 +1,8 @@
-{ stdenv, jsonnet, fetchFromGitHub, lib, ... }:
+{ gerrit-dashboard, stdenv, symlinkJoin, jsonnet, fetchFromGitHub, lib, ... }:
+let
+  inherit (lib) concatMapStringsSep;
+  datasource-id = "mimir";
+in
 rec {
   grafonnet = fetchFromGitHub {
     owner = "grafana";
@@ -8,14 +12,32 @@ rec {
     rev = "a1d61cce1da59c71409b99b5c7568511fec661ea";
     hash = "sha256-fs5JZJbcL6sQXBjYhp5eeRtjTFw0J1O/BcwBC8Vm9EM=";
   };
-  buildJsonnetDashboards = dashboardSrc: target: stdenv.mkDerivation {
-    name = "jsonnet-grafana-dashboard-${baseNameOf target}";
+  buildJsonnetDashboards = dashboardSrc: targets: stdenv.mkDerivation {
+    name = "jsonnet-grafana-dashboards";
     src = dashboardSrc;
     buildInputs = [ jsonnet ];
     buildPhase = ''
       runHook preBuild
-      jsonnet -J ${grafonnet} --ext-code publish=false ${target} > $out
+      mkdir -p $out
+      ${concatMapStringsSep "\n" (target: "jsonnet -J ${grafonnet} --ext-str datasource=${datasource-id} --ext-code publish=true $src/${target} > $out/${baseNameOf target}.json") targets}
       runHook postBuild
     '';
   };
+
+  allDashboards = symlinkJoin {
+    name = "all-jsonnet-dashboards";
+    paths = [
+      (buildJsonnetDashboards gerrit-dashboard [
+        "dashboards/gerrit/caches/gerrit-caches.jsonnet"
+        "dashboards/gerrit/fetch-clone/gerrit-fetch-clone.jsonnet"
+        "dashboards/gerrit/fetch-clone/gerrit-phases.jsonnet"
+        "dashboards/gerrit/healthcheck/gerrit-healthcheck.jsonnet"
+        "dashboards/gerrit/latency/gerrit-push-latency.jsonnet"
+        "dashboards/gerrit/latency/gerrit-ui-actions-latency.jsonnet"
+        "dashboards/gerrit/overview/gerrit-overview.jsonnet"
+        "dashboards/gerrit/process/gerrit-process.jsonnet"
+        "dashboards/gerrit/queues/gerrit-queues.jsonnet"
+      ])
+    ];
+  };
 }
diff --git a/flake.lock b/flake.lock
index bf94103..e60d6fb 100644
--- a/flake.lock
+++ b/flake.lock
@@ -388,11 +388,11 @@
     "gerrit-dashboard": {
       "flake": false,
       "locked": {
-        "lastModified": 1724491526,
-        "narHash": "sha256-iBI8Rkcv3CYdZHz5hDI0104C+DgPZRh5K6Zcqz9iUWw=",
+        "lastModified": 1724509518,
+        "narHash": "sha256-fwYXZVddxfzrlDa3QnFCwHqrbEX+3PrWy0QOlbO+8jk=",
         "ref": "refs/heads/master",
-        "rev": "d6badc64723b888a4cfa0cf966aec8b91dcb8a2b",
-        "revCount": 74,
+        "rev": "e544abac81c581558d68abb2a8dd583049073939",
+        "revCount": 75,
         "type": "git",
         "url": "https://git.lix.systems/the-distro/gerrit-monitoring.git"
       },
diff --git a/services/monitoring/lgtm/grafana.nix b/services/monitoring/lgtm/grafana.nix
index 7867685..d803304 100644
--- a/services/monitoring/lgtm/grafana.nix
+++ b/services/monitoring/lgtm/grafana.nix
@@ -1,11 +1,16 @@
 {
   config,
   lib,
+  pkgs,
+  inputs,
   ...
 }:
 let
   cfg = config.bagel.services.grafana;
   inherit (lib) mkEnableOption mkIf;
+  generatedJsonnetDashboards = (pkgs.callPackage ../../../dashboards { 
+    inherit (inputs) gerrit-dashboard;
+  }).allDashboards;
 in
 {
   options.bagel.services.grafana.enable = mkEnableOption "Grafana frontend";
@@ -84,6 +89,10 @@ in
                 name = "default";
                 options.path = ./dashboards;
               }
+              {
+                name = "jsonnet";
+                options.path = generatedJsonnetDashboards;
+              }
             ];
           };