From 20a394f9118439305cdcde7bf99f6cadfdb4a868 Mon Sep 17 00:00:00 2001
From: Pim Kunis <pim@kunis.nl>
Date: Tue, 5 Mar 2024 22:51:26 +0100
Subject: [PATCH] monitor hosts and dns

---
 nix/modules/monitoring/default.nix         |  3 +-
 nix/modules/monitoring/gatus-endpoints.nix | 56 +++++++++++++++++++---
 2 files changed, 51 insertions(+), 8 deletions(-)

diff --git a/nix/modules/monitoring/default.nix b/nix/modules/monitoring/default.nix
index bc9099b..8384b1d 100644
--- a/nix/modules/monitoring/default.nix
+++ b/nix/modules/monitoring/default.nix
@@ -5,6 +5,7 @@ in
 {
   imports = [
     "${nixpkgs-unstable}/nixos/modules/services/monitoring/gatus.nix"
+    ./gatus-endpoints.nix
   ];
 
   options = {
@@ -57,7 +58,6 @@ in
 
       settings = {
         web.port = 4242;
-        endpoints = import ./gatus-endpoints.nix;
 
         alerting.email = {
           from = "gatus@kun.is";
@@ -65,6 +65,7 @@ in
           port = 2525;
           to = "pim@kunis.nl";
           client.insecure = true;
+
           default-alert = {
             enabled = true;
             failure-threshold = 2;
diff --git a/nix/modules/monitoring/gatus-endpoints.nix b/nix/modules/monitoring/gatus-endpoints.nix
index 92a7f66..8680367 100644
--- a/nix/modules/monitoring/gatus-endpoints.nix
+++ b/nix/modules/monitoring/gatus-endpoints.nix
@@ -1,8 +1,24 @@
+{ lib, config, machines, ... }:
 let
+  cfg = config.lab.monitoring;
+
   status = code: "[STATUS] == ${toString code}";
   bodyContains = text: "[BODY] == pat(*${text}*)";
   maxResponseTime = ms: "[RESPONSE_TIME] < ${toString ms}";
-  endpoints = [
+
+  machineEndpoints = lib.attrsets.mapAttrsToList
+    (name: machine:
+      let
+        domain = if machine.isPhysical then "hyp" else "dmz";
+      in
+      {
+        name = "Host ${name}";
+        url = "icmp://${name}.${domain}";
+        conditions = [ "[RESPONSE_TIME] < 10" ];
+      })
+    machines;
+
+  otherEndpoints = [
     {
       name = "Forgejo";
       url = "https://git.kun.is";
@@ -182,11 +198,37 @@ let
         (maxResponseTime 750)
       ];
     }
+    {
+      name = "BIND";
+      url = "192.168.30.7";
+      dns = {
+        query-type = "SOA";
+        query-name = "kun.is";
+      };
+      conditions = [
+        "[DNS_RCODE] == NOERROR"
+      ];
+    }
+    {
+      name = "Pi-hole DNS";
+      url = "192.168.30.8";
+      dns = {
+        query-type = "SOA";
+        query-name = "kun.is";
+      };
+      conditions = [
+        "[DNS_RCODE] == NOERROR"
+      ];
+    }
   ];
 in
-map
-  (endpoint: endpoint // {
-    interval = "5m";
-    alerts = [{ type = "email"; }];
-  })
-  endpoints
+{
+  config = lib.mkIf cfg.server.enable {
+    services.gatus.settings.endpoints = map
+      (endpoint: endpoint // {
+        interval = "5m";
+        alerts = [{ type = "email"; }];
+      })
+      (machineEndpoints ++ otherEndpoints);
+  };
+}