luftqualitaet: init

default.nix

@@ -25,6 +25,7 @@ let
 in {
   xerox = wrapScript "xerox" ./xerox/scrape.rb;
   luftdaten = wrapScript "luftdaten" ./luftdaten/scrape.rb;
+  luftqualitaet = wrapScript "luftqualitaet" ./luftqualitaet/scrape.rb;
   fhem = wrapScript "fhem" ./fhem/scrape.rb;
   matemat = wrapScript "matemat" ./matemat/scrape.rb;
   freifunk_node = wrapScript "freifunk_node" ./freifunk_node/scrape.rb;

luftqualitaet/scrape.rb

@@ -0,0 +1,63 @@
+#!/usr/bin/env ruby
+# coding: utf-8
+
+require 'open-uri'
+require 'csv'
+require 'time'
+require 'influxdb'
+
+TIME_PRECISION = 'h'
+
+station = ARGV[0]
+unless station
+  puts "Missing station argument"
+  exit 1
+end
+
+def fmt_date d
+  d.strftime "%Y-%m-%d"
+end
+url = "https://www.umweltbundesamt.de/api/air_data/v2/airquality/csv?date_from=#{fmt_date(Date::today - 1)}&time_from=0&date_to=#{fmt_date Date::today}&time_to=24&station=#{station}&lang=de"
+
+puts "GET #{url}"
+data = open(url).read().force_encoding("UTF-8")
+
+INDEX = {
+  "sehr gut" => 1,
+  "gut" => 2,
+  "mäßig" => 3,
+  "schlecht" => 4,
+  "sehr schlecht" => 5,
+}
+
+points = []
+CSV::parse(data, headers: true, col_sep: ";").each do |data|
+  values = {}
+  station = nil
+  time = nil
+  data.each do |n, v|
+    n = n.dup.force_encoding "UTF-8"
+    case n
+    when /Stationscode/
+      station = v
+    when /Datum/
+      time = Time.strptime v, "'%d.%m.%Y %H:%M'" if v
+    when "Luftqualitätsindex"
+      values["Luftqualitätsindex"] = INDEX[v] if INDEX[v]
+    else
+      values[n] = v.to_f
+    end
+  end
+
+  points.push({
+                series: "umweltbundesamt",
+                tags: {
+                  station: station,
+                },
+                values: values,
+                timestamp: InfluxDB::convert_timestamp(time.to_i, TIME_PRECISION),
+              }) if time
+end
+
+db = InfluxDB::Client.new(url: "http://grafana.serv.zentralwerk.dn42:8086/luftdaten")
+db.write_points points, TIME_PRECISION