From bf87b3460ac23d77f2585d247292f40616f59c4b Mon Sep 17 00:00:00 2001
From: stuebinm
Date: Fri, 11 Nov 2022 23:19:34 +0100
Subject: chaski/tracktrain: add a grafana

---
 chaski/services/tracktrain.nix | 52 +++++++++++++++++++++++++++++++++++++++++-
 1 file changed, 51 insertions(+), 1 deletion(-)

diff --git a/chaski/services/tracktrain.nix b/chaski/services/tracktrain.nix
index 3d59806..5887f73 100644
--- a/chaski/services/tracktrain.nix
+++ b/chaski/services/tracktrain.nix
@@ -19,12 +19,62 @@ in
       proxyPass = "http://192.168.42.41:4000";
       proxyWebsockets = true;
     };
+    # don't expose prometheus endpoint
+    locations."/metrics".return = "404";
+
     enableACME = true;
     forceSSL = true;
     extraConfig = ''
       add_header 'Access-Control-Allow-Origin' '*' always;
     '';
   };
+  services.nginx.virtualHosts."tracktrain.ilztalbahn.eu" = {
+    locations."/api" = {
+      proxyPass = "http://192.168.42.41:4000";
+      proxyWebsockets = true;
+      extraConfig = ''
+        add_header 'Access-Control-Allow-Origin' '*' always;
+      '';
+    };
+    locations."/metrics/" = {
+      proxyPass = "http://localhost:2342";
+      proxyWebsockets = true;
+      extraConfig = ''
+        rewrite  ^/metrics/(.*)  /$1 break;
+      '';
+    };
+    enableACME = true;
+    forceSSL = true;
+  };
+
+  services.prometheus = {
+    enable = true;
+    port = 9001;
+    scrapeConfigs = [ {
+      job_name = "tracktrain";
+      static_configs = [{
+        targets = [  "192.168.42.41:4000" ];
+      }];
+    } ];
+  };
+
+  services.grafana = {
+    enable = true;
+    domain = "tracktrain.ilztalbahn.eu";
+    rootUrl = "%(protocol)s://%(domain)s:/metrics/";
+    port = 2342;
+    addr = "0.0.0.0";
+    extraOptions.serve_from_sub_path = "true";
+
+    provision = {
+      enable = true;
+      datasources = [ {
+        url = "http://localhost:9001";
+        type = "prometheus";
+        name = "prometheus";
+      } ];
+    };
+  };
 
   networking.firewall.allowedTCPPorts = [ 443 ];
 
@@ -56,7 +106,7 @@ in
               sed -i "s/^>=.*//g" *.cabal
               sed -i "s/>=.*//g" *.cabal
             ''; }))
-           }/bin/tracktrain --dbString="dbname=tracktrain user=tracktrain" --warp.port=4000
+           }/bin/tracktrain --dbString="dbname=tracktrain user=tracktrain" --warp.port=4000 +RTS -T
         '';
         startAt = "daily";
       };
-- 
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