first test

main.go

@@ -0,0 +1,132 @@
+// vi:ts=4:sts=4:sw=4:noet:tw=72
+//
+// covid-exporter
+//
+// Copyright (c) 2021 Andreas Neue <an@dnix.de>
+
+package main
+
+import (
+	"encoding/json"
+	"fmt"
+	"io/ioutil"
+	"net/http"
+	"time"
+
+	"github.com/prometheus/client_golang/prometheus"
+)
+
+type CovidRecord struct {
+	Updated                int
+	Country                string
+	CountryInfo            interface{}
+	Cases                  int
+	TodayCases             int
+	Deaths                 int
+	TodayDeaths            int
+	Recovered              int
+	TodayRecovered         int
+	Active                 int
+	Critical               int
+	CasesPerOneMillion     float32
+	DeathsPerOneMillion    float32
+	Tests                  int
+	TestsPerOneMillion     int
+	Population             int
+	Continent              string
+	OneCasePerPeople       int
+	OneDeathPerPeople      int
+	OneTestPerPeople       int
+	ActivePerOneMillion    float32
+	RecoveredPerOneMillion float32
+	CriticalPerOneMillion  float32
+}
+
+var (
+	gaugeCases      *prometheus.GaugeVec
+	gaugeActive     *prometheus.GaugeVec
+	gaugeCritical   *prometheus.GaugeVec
+	gaugePopulation *prometheus.GaugeVec
+)
+
+func main() {
+	url := "https://corona.lmao.ninja/v3/covid-19/countries"
+
+	go getCovidStats(url)
+	serveMetrics()
+}
+
+func getCovidStats(url string) {
+	for {
+		resp, err := http.Get(url)
+		if err != nil {
+			fmt.Printf("%v\n", err)
+			continue
+		}
+		defer resp.Body.Close()
+		data, err := ioutil.ReadAll(resp.Body)
+		if err != nil {
+			fmt.Printf("%v\n", err)
+			continue
+		}
+		var cr []CovidRecord
+		err = json.Unmarshal(data, &cr)
+		if err != nil {
+			fmt.Printf("%v\n", err)
+			continue
+		}
+		for i := range cr {
+			gaugeCases.WithLabelValues(cr[i].Country).Set(float64(cr[i].Cases))
+			gaugeActive.WithLabelValues(cr[i].Country).Set(float64(cr[i].Active))
+			gaugeCritical.WithLabelValues(cr[i].Country).Set(float64(cr[i].Critical))
+			gaugePopulation.WithLabelValues(cr[i].Country).Set(float64(cr[i].Population))
+		}
+		time.Sleep(15 * time.Minute)
+	}
+}
+
+func serveMetrics() {
+	gaugeCases = prometheus.NewGaugeVec(
+		prometheus.GaugeOpts{
+			Name: "covid_cases",
+			Help: "Covid-19 cases",
+		},
+		[]string{
+			"country",
+		},
+	)
+	prometheus.MustRegister(gaugeCases)
+	gaugeActive = prometheus.NewGaugeVec(
+		prometheus.GaugeOpts{
+			Name: "covid_active",
+			Help: "Covid-19 active cases",
+		},
+		[]string{
+			"country",
+		},
+	)
+	prometheus.MustRegister(gaugeActive)
+	gaugeCritical = prometheus.NewGaugeVec(
+		prometheus.GaugeOpts{
+			Name: "covid_critical",
+			Help: "Covid-19 critical cases",
+		},
+		[]string{
+			"country",
+		},
+	)
+	prometheus.MustRegister(gaugeCritical)
+	gaugePopulation = prometheus.NewGaugeVec(
+		prometheus.GaugeOpts{
+			Name: "covid_population",
+			Help: "Population",
+		},
+		[]string{
+			"country",
+		},
+	)
+	prometheus.MustRegister(gaugePopulation)
+
+	http.Handle("/metrics", prometheus.Handler())
+	http.ListenAndServe(":9099", nil)
+}