shack/powerraw: send stats to influx as well

krebs/2configs/shack/powerraw.nix

@@ -4,6 +4,7 @@
 # Requires mqtt available at mqtt.shack
 # Requires hostname powerraw.shack
 let
+  influx-url = "http://influx.shack:8086";
   pkg = pkgs.python3.pkgs.callPackage (
     pkgs.fetchgit {
       url = "https://git.shackspace.de/rz/powermeter.git";
@@ -13,9 +14,7 @@ let
 in {
   # receive response from light.shack / standby.shack
   networking.firewall.allowedUDPPorts = [ 11111 ];
-  users.users.powermeter = {
-    extraGroups = [ "dialout" ];
-  };
+  users.users.powermeter.extraGroups = [ "dialout" ];
 
   systemd.services.powermeter-serial2mqtt = {
     description = "powerraw Serial -> mqtt";
@@ -38,4 +37,36 @@ in {
       PrivateTmp = true;
     };
   };
+
+  services.telegraf = {
+    enable = true;
+    extraConfig = {
+      agent.debug = false;
+      outputs = {
+        influxdb = [{
+          urls = [ influx-url ];
+          database = "telegraf";
+        }];
+      };
+    };
+  };
+
+  services.telegraf.extraConfig.inputs.mqtt_consumer = let
+    genTopic = name: topic: tags: {
+      servers = [ "tcp://mqtt.shack:1883" ];
+      qos = 0;
+      connection_timeout = "30s";
+      topics = [ topic ];
+      inherit tags;
+      persistent_session = false;
+      name_override = name;
+      data_format = "value";
+      data_type = "float";
+    };
+    sensor = "total";
+    types  = [ "Voltage" "Current" "Power" ];
+    phases = [ 1 2 3 ];
+  in
+    [ (genTopic "Power consumed" "/power/${sensor}/consumed"  { inherit sensor; }) ] ++
+    (lib.flatten (map (type: (map (phase: (genTopic "Power" "/power/${sensor}/L${toString phase}/${type}" { inherit sensor phase type; }) ) phases)) types));
 }