commit 1136ac0b01b67967c5b65abf96aa0e6b03b9a1b6
Author: Simon Rieger <simon@rieger.app>
Date:   Sun Mar 9 23:25:18 2025 +0100

    first commit

diff --git a/.env.example b/.env.example
new file mode 100644
index 0000000..9d1db55
--- /dev/null
+++ b/.env.example
@@ -0,0 +1 @@
+TRAEWELLING_TOKEN=
diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..4c49bd7
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1 @@
+.env
diff --git a/docker-compose.yml b/docker-compose.yml
new file mode 100644
index 0000000..ca05ed2
--- /dev/null
+++ b/docker-compose.yml
@@ -0,0 +1,20 @@
+version: '3.8'
+
+services:
+  traewelling-metrics:
+    build:
+      context: go/.
+      dockerfile: Dockerfile
+    #ports:
+    #  - "8080:8080" # Exponiere Port 8080 für Prometheus-Scraping
+    restart: always # Neustart bei Fehlern oder Updates
+    environment:
+      - TRAEWELLING_TOKEN=${TRAEWELLING_TOKEN}
+    networks:
+      default:
+      dns:
+        ipv4_address: 172.28.0.245
+
+networks:
+  dns:
+    external: true
diff --git a/go/Dockerfile b/go/Dockerfile
new file mode 100644
index 0000000..a287108
--- /dev/null
+++ b/go/Dockerfile
@@ -0,0 +1,28 @@
+# syntax=docker/dockerfile:1
+
+# Build the application from source
+FROM golang:1.21 AS build-stage
+
+WORKDIR /app
+
+COPY * ./
+RUN go mod download
+
+RUN CGO_ENABLED=0 GOOS=linux go build -o /main
+
+# Run the tests in the container
+FROM build-stage AS run-test-stage
+RUN go test -v ./...
+
+# Deploy the application binary into a lean image
+FROM gcr.io/distroless/base-debian11 AS build-release-stage
+
+WORKDIR /
+
+COPY --from=build-stage /main /main
+
+EXPOSE 8080
+
+USER nonroot:nonroot
+
+ENTRYPOINT ["/main"]
diff --git a/go/go.mod b/go/go.mod
new file mode 100644
index 0000000..b9e477d
--- /dev/null
+++ b/go/go.mod
@@ -0,0 +1,17 @@
+module traewelling-exporter
+
+go 1.19
+
+require github.com/prometheus/client_golang v1.21.1
+
+require (
+	github.com/beorn7/perks v1.0.1 // indirect
+	github.com/cespare/xxhash/v2 v2.3.0 // indirect
+	github.com/klauspost/compress v1.17.11 // indirect
+	github.com/munnerz/goautoneg v0.0.0-20191010083416-a7dc8b61c822 // indirect
+	github.com/prometheus/client_model v0.6.1 // indirect
+	github.com/prometheus/common v0.62.0 // indirect
+	github.com/prometheus/procfs v0.15.1 // indirect
+	golang.org/x/sys v0.28.0 // indirect
+	google.golang.org/protobuf v1.36.1 // indirect
+)
diff --git a/go/go.sum b/go/go.sum
new file mode 100644
index 0000000..428bf62
--- /dev/null
+++ b/go/go.sum
@@ -0,0 +1,26 @@
+github.com/beorn7/perks v1.0.1 h1:VlbKKnNfV8bJzeqoa4cOKqO6bYr3WgKZxO8Z16+hsOM=
+github.com/beorn7/perks v1.0.1/go.mod h1:G2ZrVWU2WbWT9wwq4/hrbKbnv/1ERSJQ0ibhJ6rlkpw=
+github.com/cespare/xxhash/v2 v2.3.0 h1:UL815xU9SqsFlibzuggzjXhog7bL6oX9BbNZnL2UFvs=
+github.com/cespare/xxhash/v2 v2.3.0/go.mod h1:VGX0DQ3Q6kWi7AoAeZDth3/j3BFtOZR5XLFGgcrjCOs=
+github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
+github.com/google/go-cmp v0.6.0 h1:ofyhxvXcZhMsU5ulbFiLKl/XBFqE1GSq7atu8tAmTRI=
+github.com/klauspost/compress v1.17.11 h1:In6xLpyWOi1+C7tXUUWv2ot1QvBjxevKAaI6IXrJmUc=
+github.com/klauspost/compress v1.17.11/go.mod h1:pMDklpSncoRMuLFrf1W9Ss9KT+0rH90U12bZKk7uwG0=
+github.com/kylelemons/godebug v1.1.0 h1:RPNrshWIDI6G2gRW9EHilWtl7Z6Sb1BR0xunSBf0SNc=
+github.com/munnerz/goautoneg v0.0.0-20191010083416-a7dc8b61c822 h1:C3w9PqII01/Oq1c1nUAm88MOHcQC9l5mIlSMApZMrHA=
+github.com/munnerz/goautoneg v0.0.0-20191010083416-a7dc8b61c822/go.mod h1:+n7T8mK8HuQTcFwEeznm/DIxMOiR9yIdICNftLE1DvQ=
+github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
+github.com/prometheus/client_golang v1.21.1 h1:DOvXXTqVzvkIewV/CDPFdejpMCGeMcbGCQ8YOmu+Ibk=
+github.com/prometheus/client_golang v1.21.1/go.mod h1:U9NM32ykUErtVBxdvD3zfi+EuFkkaBvMb09mIfe0Zgg=
+github.com/prometheus/client_model v0.6.1 h1:ZKSh/rekM+n3CeS952MLRAdFwIKqeY8b62p8ais2e9E=
+github.com/prometheus/client_model v0.6.1/go.mod h1:OrxVMOVHjw3lKMa8+x6HeMGkHMQyHDk9E3jmP2AmGiY=
+github.com/prometheus/common v0.62.0 h1:xasJaQlnWAeyHdUBeGjXmutelfJHWMRr+Fg4QszZ2Io=
+github.com/prometheus/common v0.62.0/go.mod h1:vyBcEuLSvWos9B1+CyL7JZ2up+uFzXhkqml0W5zIY1I=
+github.com/prometheus/procfs v0.15.1 h1:YagwOFzUgYfKKHX6Dr+sHT7km/hxC76UB0learggepc=
+github.com/prometheus/procfs v0.15.1/go.mod h1:fB45yRUv8NstnjriLhBQLuOUt+WW4BsoGhij/e3PBqk=
+github.com/stretchr/testify v1.10.0 h1:Xv5erBjTwe/5IxqUQTdXv5kgmIvbHo3QQyRwhJsOfJA=
+golang.org/x/sys v0.28.0 h1:Fksou7UEQUWlKvIdsqzJmUmCX3cZuD2+P3XyyzwMhlA=
+golang.org/x/sys v0.28.0/go.mod h1:/VUhepiaJMQUp4+oa/7Zr1D23ma6VTLIYjOOTFZPUcA=
+google.golang.org/protobuf v1.36.1 h1:yBPeRvTftaleIgM3PZ/WBIZ7XM/eEYAaEyCwvyjq/gk=
+google.golang.org/protobuf v1.36.1/go.mod h1:9fA7Ob0pmnwhb644+1+CVWFRbNajQ6iRojtC/QF5bRE=
+gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA=
diff --git a/go/main.go b/go/main.go
new file mode 100644
index 0000000..785efd6
--- /dev/null
+++ b/go/main.go
@@ -0,0 +1,119 @@
+package main
+
+import (
+	"encoding/json"
+	"fmt"
+	"net/http"
+	"os"
+	"time"
+
+	"github.com/prometheus/client_golang/prometheus"
+	"github.com/prometheus/client_golang/prometheus/promauto"
+	"github.com/prometheus/client_golang/prometheus/promhttp"
+)
+
+var (
+	totalTrips = promauto.NewGauge(prometheus.GaugeOpts{
+		Name: "traewelling_total_trips",
+		Help: "Gesamtanzahl der Fahrten",
+	})
+	totalDistance = promauto.NewGauge(prometheus.GaugeOpts{
+		Name: "traewelling_total_distance_km",
+		Help: "Gesamtdistanz aller Fahrten in Kilometern",
+	})
+	averageDuration = promauto.NewGauge(prometheus.GaugeOpts{
+		Name: "traewelling_average_duration_minutes",
+		Help: "Durchschnittliche Dauer der Fahrten in Minuten",
+	})
+)
+
+type DashboardResponse struct {
+	Data []struct {
+		ID    int `json:"id"`
+		Train struct {
+			Trip      int     `json:"trip"`
+			Distance  float64 `json:"distance"`
+			Duration  int     `json:"duration"`
+			Category  string  `json:"category"`
+			LineName  string  `json:"lineName"`
+			JourneyNumber int `json:"journeyNumber"`
+			Origin    struct {
+				Name string `json:"name"`
+			} `json:"origin"`
+			Destination struct {
+				Name string `json:"name"`
+			} `json:"destination"`
+		} `json:"train"`
+	} `json:"data"`
+}
+
+func fetchTraewellingData() (*DashboardResponse, error) {
+	url := "https://traewelling.de/api/v1/dashboard"
+	client := &http.Client{Timeout: 10 * time.Second}
+	req, err := http.NewRequest("GET", url, nil)
+	if err != nil {
+		return nil, fmt.Errorf("Fehler beim Erstellen der Anfrage: %v", err)
+	}
+
+	token := os.Getenv("TRAEWELLING_TOKEN")
+	if token == "" {
+		return nil, fmt.Errorf("TRAEWELLING_TOKEN ist nicht gesetzt")
+	}
+	req.Header.Set("Authorization", "Bearer "+token)
+	req.Header.Set("Accept", "application/json")
+
+	resp, err := client.Do(req)
+	if err != nil {
+		return nil, fmt.Errorf("Fehler beim Senden der Anfrage: %v", err)
+	}
+	defer resp.Body.Close()
+
+	if resp.StatusCode != http.StatusOK {
+		return nil, fmt.Errorf("Fehlerhafte Antwort: %d", resp.StatusCode)
+	}
+
+	var apiResponse DashboardResponse
+	err = json.NewDecoder(resp.Body).Decode(&apiResponse)
+	if err != nil {
+		return nil, fmt.Errorf("Fehler beim Parsen der JSON-Daten: %v", err)
+	}
+
+	return &apiResponse, nil
+}
+
+func updateMetrics() {
+	data, err := fetchTraewellingData()
+	if err != nil {
+		fmt.Printf("Fehler beim Abrufen der Daten: %v\n", err)
+		return
+	}
+
+	var totalTripsCount int
+	var totalDistanceSum float64
+	var totalDurationSum int
+
+	for _, trip := range data.Data {
+		totalTripsCount++
+		totalDistanceSum += trip.Train.Distance / 1000
+		totalDurationSum += trip.Train.Duration
+	}
+
+	totalTrips.Set(float64(totalTripsCount))
+	totalDistance.Set(totalDistanceSum)
+	if totalTripsCount > 0 {
+		averageDuration.Set(float64(totalDurationSum) / float64(totalTripsCount))
+	}
+}
+
+func main() {
+	go func() {
+		for {
+			updateMetrics()
+			time.Sleep(30 * time.Second)
+		}
+	}()
+
+	http.Handle("/metrics", promhttp.Handler())
+	fmt.Println("Server läuft auf Port 8080...")
+	http.ListenAndServe(":8080", nil)
+}