Add UPC temperature sensor monitoring

These sensors are part of their air quality measurements, which just
happen to be very close to our server room.

Reviewed-by: Aleix Boné <abonerib@bsc.es>

m/hut/monitoring.nix

@@ -4,6 +4,7 @@
   imports = [
     ../module/slurm-exporter.nix
     ../module/meteocat-exporter.nix
+    ../module/upc-qaire-exporter.nix
     ./gpfs-probe.nix
     ./nix-daemon-exporter.nix
   ];
@@ -112,6 +113,7 @@
             "127.0.0.1:9966" # GPFS custom exporter
             "127.0.0.1:9999" # Nix-daemon custom exporter
             "127.0.0.1:9929" # Meteocat custom exporter
+            "127.0.0.1:9928" # UPC Qaire custom exporter
             "127.0.0.1:${toString config.services.prometheus.exporters.blackbox.port}"
           ];
         }];

m/module/upc-qaire-exporter.nix

@@ -0,0 +1,17 @@
+{ config, lib, pkgs, ... }:
+
+with lib;
+
+{
+  systemd.services."prometheus-upc-qaire-exporter" = {
+    wantedBy = [ "multi-user.target" ];
+    after = [ "network.target" ];
+    serviceConfig = {
+      Restart = mkDefault "always";
+      PrivateTmp = mkDefault true;
+      WorkingDirectory = mkDefault "/tmp";
+      DynamicUser = mkDefault true;
+      ExecStart = "${pkgs.upc-qaire-exporter}/bin/upc-qaire-exporter";
+    };
+  };
+}

pkgs/overlay.nix

@@ -55,4 +55,5 @@ final: prev:
 
   prometheus-slurm-exporter = prev.callPackage ./slurm-exporter.nix { };
   meteocat-exporter = prev.callPackage ./meteocat-exporter/default.nix { };
+  upc-qaire-exporter = prev.callPackage ./upc-qaire-exporter/default.nix { };
 }

pkgs/upc-qaire-exporter/default.nix

@@ -0,0 +1,24 @@
+{ python3Packages, lib }:
+
+python3Packages.buildPythonApplication rec {
+  pname = "upc-qaire-exporter";
+  version = "1.0";
+
+  src = ./.;
+
+  doCheck = false;
+
+  build-system = with python3Packages; [
+    setuptools
+  ];
+
+  dependencies = with python3Packages; [
+    prometheus-client
+    requests
+  ];
+
+  meta = with lib; {
+    description = "UPC Qaire Prometheus Exporter";
+    platforms = platforms.linux;
+  };
+}

pkgs/upc-qaire-exporter/setup.py

@@ -0,0 +1,11 @@
+#!/usr/bin/env python
+
+from setuptools import setup, find_packages
+
+setup(name='upc-qaire-exporter',
+      version='1.0',
+      # Modules to import from other scripts:
+      packages=find_packages(),
+      # Executables
+      scripts=["upc-qaire-exporter"],
+     )

pkgs/upc-qaire-exporter/upc-qaire-exporter

@@ -0,0 +1,74 @@
+#!/usr/bin/env python3
+
+import time
+from prometheus_client import start_http_server, Gauge
+import requests, json
+from datetime import datetime, timedelta
+
+# Configuration -------------------------------------------
+listening_port = 9928
+update_period = 60 * 5 # Each 5 min
+# ---------------------------------------------------------
+
+metric_temp = Gauge('upc_c6_s302_temp', 'UPC C6 S302 temperature sensor')
+
+def genparams():
+    d = {}
+    d['topic'] = 'TEMPERATURE'
+    d['shift_dates_to'] = ''
+    d['datapoints'] = 301
+    d['devicesAndColors'] = '1148418@@@#40ACB6'
+
+    now = datetime.now()
+
+    d['fromDate'] = now.strftime('%d/%m/%Y')
+    d['toDate'] = now.strftime('%d/%m/%Y')
+    d['serviceFrequency'] = 'NONE'
+
+    # WTF!
+    for i in range(7):
+        for j in range(48):
+            key = 'week.days[{}].hours[{}].value'.format(i, j)
+            d[key] = 'OPEN'
+
+    return d
+
+def measure():
+    # First we need to load session
+    s = requests.Session()
+    r = s.get("https://upc.edu/sirena")
+    if r.status_code != 200:
+        print("bad HTTP status code on new session: {}".format(r.status_code))
+        return
+
+    if s.cookies.get("JSESSIONID") is None:
+        print("cannot get JSESSIONID")
+        return
+
+    # Now we can pull the data
+    url = "https://upcsirena.app.dexma.com/l_12535/analysis/by_datapoints/data.json"
+    r = s.post(url, data=genparams())
+
+    if r.status_code != 200:
+        print("bad HTTP status code on data: {}".format(r.status_code))
+        return
+
+    #print(r.text)
+    j = json.loads(r.content)
+
+    # Just take the last one
+    last = j['data']['chartElementList'][-1]
+    temp = last['values']['1148418-Temperatura']
+
+    return temp
+
+if __name__ == '__main__':
+    start_http_server(port=listening_port, addr="localhost")
+    while True:
+        try:
+            metric_temp.set(measure())
+        except:
+            print("measure failed")
+            metric_temp.set(float("nan"))
+
+        time.sleep(update_period)