Initial code base

README.md

@@ -1 +1,29 @@
 # hcloud-pricing-exporter
+
+[![Build Status](https://img.shields.io/github/workflow/status/jangraefen/hcloud-pricing-exporter/Build?logo=GitHub)](https://github.com/jangraefen/hcloud-pricing-exporter/actions?query=workflow:Build)
+[![PkgGoDev](https://pkg.go.dev/badge/mod/github.com/jangraefen/hcloud-pricing-exporter)](https://pkg.go.dev/mod/github.com/jangraefen/hcloud-pricing-exporter)
+[![Go Report Card](https://goreportcard.com/badge/github.com/jangraefen/hcloud-pricing-exporter)](https://goreportcard.com/report/github.com/jangraefen/hcloud-pricing-exporter)
+
+A Prometheus exporter that connects to your HCloud account and collects data on your current expenses. The aim is to
+make cost of cloud infrastructure more transparent and manageable, especially for private projects.
+
+Please note that no gurantees on correctness are made and any financial decisions should be always be based on the
+billing and cost functions provided by HCloud itself. Some hourly costs are estimations based on monthly costs, if the
+HCloud API does not provide an hourly expense.
+
+## Exported metrics
+
+- `hcloud_pricing_floatingip_hourly{name, location}` _(Estimated based on the monthly price)_
+- `hcloud_pricing_floatingip_monthly{name, location}`
+- `hcloud_pricing_loadbalancer_hourly{name, location, type}`
+- `hcloud_pricing_loadbalancer_monthly{name, location, type}`
+- `hcloud_pricing_server_hourly{name, location, type}`
+- `hcloud_pricing_server_monthly{name, location, type}`
+- `hcloud_pricing_server_backups_hourly{name, location, type}`
+- `hcloud_pricing_server_backups_monthly{name, location, type}`
+- `hcloud_pricing_server_traffic_hourly{name, location, type}` _(Estimated based on the monthly price)_
+- `hcloud_pricing_server_traffic_monthly{name, location, type}`
+- `hcloud_pricing_snapshot_hourly{name}` _(Estimated based on the monthly price)_
+- `hcloud_pricing_snapshot_monthly{name}`
+- `hcloud_pricing_volume_hourly{name, location, bytes}` _(Estimated based on the monthly price)_
+- `hcloud_pricing_volume_monthly{name, location, bytes}`

fetcher/fetcher.go

@@ -0,0 +1,55 @@
+package fetcher
+
+import (
+	"context"
+	"fmt"
+
+	"github.com/hetznercloud/hcloud-go/hcloud"
+	"github.com/prometheus/client_golang/prometheus"
+)
+
+var (
+	ctx = context.Background()
+)
+
+type Fetcher interface {
+	GetHourly() prometheus.Collector
+	GetMonthly() prometheus.Collector
+	Run(*hcloud.Client) error
+}
+
+type baseFetcher struct {
+	hourly  *prometheus.GaugeVec
+	monthly *prometheus.GaugeVec
+}
+
+func (fetcher baseFetcher) GetHourly() prometheus.Collector {
+	return fetcher.hourly
+}
+
+func (fetcher baseFetcher) GetMonthly() prometheus.Collector {
+	return fetcher.monthly
+}
+
+func new(resource string, additionalLabels ...string) *baseFetcher {
+	labels := []string{"name"}
+	labels = append(labels, additionalLabels...)
+
+	hourlyGaugeOpts := prometheus.GaugeOpts{
+		Namespace: "hcloud",
+		Subsystem: "pricing",
+		Name:      fmt.Sprintf("%s_hourly", resource),
+		Help:      fmt.Sprintf("The cost of the resource %s per hour", resource),
+	}
+	monthlyGaugeOpts := prometheus.GaugeOpts{
+		Namespace: "hcloud",
+		Subsystem: "pricing",
+		Name:      fmt.Sprintf("%s_monthly", resource),
+		Help:      fmt.Sprintf("The cost of the resource %s per month", resource),
+	}
+
+	return &baseFetcher{
+		hourly:  prometheus.NewGaugeVec(hourlyGaugeOpts, labels),
+		monthly: prometheus.NewGaugeVec(monthlyGaugeOpts, labels),
+	}
+}

fetcher/floatingip.go

@@ -0,0 +1,38 @@
+package fetcher
+
+import (
+	"github.com/hetznercloud/hcloud-go/hcloud"
+)
+
+const (
+	floatingIPPrice = float64(1.19)
+)
+
+var _ Fetcher = &floatingIP{}
+
+func NewFloatingIP() Fetcher {
+	return &floatingIP{new("floatingip", "location")}
+}
+
+type floatingIP struct {
+	*baseFetcher
+}
+
+func (floatingIP floatingIP) Run(client *hcloud.Client) error {
+	floatingIPs, _, err := client.FloatingIP.List(ctx, hcloud.FloatingIPListOpts{})
+	if err != nil {
+		return err
+	}
+
+	for _, f := range floatingIPs {
+		location := f.HomeLocation
+
+		monthlyPrice := floatingIPPrice
+		hourlyPrice := pricingPerHour(monthlyPrice)
+
+		floatingIP.hourly.WithLabelValues(f.Name, location.Name).Set(hourlyPrice)
+		floatingIP.monthly.WithLabelValues(f.Name, location.Name).Set(monthlyPrice)
+	}
+
+	return nil
+}

fetcher/loadbalancer.go

@@ -0,0 +1,48 @@
+package fetcher
+
+import (
+	"fmt"
+
+	"github.com/hetznercloud/hcloud-go/hcloud"
+)
+
+var _ Fetcher = &loadBalancer{}
+
+func NewLoadbalancer() Fetcher {
+	return &loadBalancer{new("loadbalancer", "location", "type")}
+}
+
+type loadBalancer struct {
+	*baseFetcher
+}
+
+func (loadBalancer loadBalancer) Run(client *hcloud.Client) error {
+	loadBalancers, _, err := client.LoadBalancer.List(ctx, hcloud.LoadBalancerListOpts{})
+	if err != nil {
+		return err
+	}
+
+	for _, lb := range loadBalancers {
+		location := lb.Location
+
+		pricing, err := findLBPricing(location, lb.LoadBalancerType.Pricings)
+		if err != nil {
+			return err
+		}
+
+		parseToGauge(loadBalancer.hourly.WithLabelValues(lb.Name, location.Name, lb.LoadBalancerType.Name), pricing.Hourly.Gross)
+		parseToGauge(loadBalancer.monthly.WithLabelValues(lb.Name, location.Name, lb.LoadBalancerType.Name), pricing.Monthly.Gross)
+	}
+
+	return nil
+}
+
+func findLBPricing(location *hcloud.Location, pricings []hcloud.LoadBalancerTypeLocationPricing) (*hcloud.LoadBalancerTypeLocationPricing, error) {
+	for _, pricing := range pricings {
+		if pricing.Location.ID == location.ID {
+			return &pricing, nil
+		}
+	}
+
+	return nil, fmt.Errorf("no pricing found for location %s", location.Name)
+}

fetcher/server.go

@@ -0,0 +1,48 @@
+package fetcher
+
+import (
+	"fmt"
+
+	"github.com/hetznercloud/hcloud-go/hcloud"
+)
+
+var _ Fetcher = &server{}
+
+func NewServer() Fetcher {
+	return &server{new("server", "location")}
+}
+
+type server struct {
+	*baseFetcher
+}
+
+func (server server) Run(client *hcloud.Client) error {
+	servers, _, err := client.Server.List(ctx, hcloud.ServerListOpts{})
+	if err != nil {
+		return err
+	}
+
+	for _, s := range servers {
+		location := s.Datacenter.Location
+
+		pricing, err := findServerPricing(location, s.ServerType.Pricings)
+		if err != nil {
+			return err
+		}
+
+		parseToGauge(server.hourly.WithLabelValues(s.Name, location.Name, s.ServerType.Name), pricing.Hourly.Gross)
+		parseToGauge(server.monthly.WithLabelValues(s.Name, location.Name, s.ServerType.Name), pricing.Monthly.Gross)
+	}
+
+	return nil
+}
+
+func findServerPricing(location *hcloud.Location, pricings []hcloud.ServerTypeLocationPricing) (*hcloud.ServerTypeLocationPricing, error) {
+	for _, pricing := range pricings {
+		if pricing.Location.ID == location.ID {
+			return &pricing, nil
+		}
+	}
+
+	return nil, fmt.Errorf("no pricing found for location %s", location.Name)
+}

fetcher/server_backups.go

@@ -0,0 +1,56 @@
+package fetcher
+
+import (
+	"strconv"
+
+	"github.com/hetznercloud/hcloud-go/hcloud"
+)
+
+const (
+	backupPriceMultiplier = 0.2
+)
+
+var _ Fetcher = &server{}
+
+func NewServerBackup() Fetcher {
+	return &serverBackup{new("server_backup", "location", "type")}
+}
+
+type serverBackup struct {
+	*baseFetcher
+}
+
+func (serverBackup serverBackup) Run(client *hcloud.Client) error {
+	servers, _, err := client.Server.List(ctx, hcloud.ServerListOpts{})
+	if err != nil {
+		return err
+	}
+
+	for _, s := range servers {
+		if s.BackupWindow != "" {
+			location := s.Datacenter.Location
+
+			serverPrice, err := findServerPricing(location, s.ServerType.Pricings)
+			if err != nil {
+				return err
+			}
+
+			hourlyPrice := toBackupPrice(serverPrice.Hourly.Gross)
+			monthlyPrice := toBackupPrice(serverPrice.Monthly.Gross)
+
+			serverBackup.hourly.WithLabelValues(s.Name, location.Name, s.ServerType.Name).Set(hourlyPrice)
+			serverBackup.monthly.WithLabelValues(s.Name, location.Name, s.ServerType.Name).Set(monthlyPrice)
+		}
+	}
+
+	return nil
+}
+
+func toBackupPrice(rawServerPrice string) float64 {
+	serverPrice, err := strconv.Atoi(rawServerPrice)
+	if err != nil {
+		return 0
+	}
+
+	return float64(serverPrice) * backupPriceMultiplier
+}

fetcher/server_traffic.go

@@ -0,0 +1,47 @@
+package fetcher
+
+import (
+	"math"
+
+	"github.com/hetznercloud/hcloud-go/hcloud"
+)
+
+const (
+	trafficPrice = 1.19
+)
+
+var _ Fetcher = &serverTraffic{}
+
+func NewServerTraffic() Fetcher {
+	return &serverTraffic{new("server_traffic", "location", "type")}
+}
+
+type serverTraffic struct {
+	*baseFetcher
+}
+
+func (serverTraffic serverTraffic) Run(client *hcloud.Client) error {
+	servers, _, err := client.Server.List(ctx, hcloud.ServerListOpts{})
+	if err != nil {
+		return err
+	}
+
+	for _, s := range servers {
+		location := s.Datacenter.Location
+
+		additionalTraffic := s.OutgoingTraffic - s.IncludedTraffic
+		if additionalTraffic < 0 {
+			serverTraffic.hourly.WithLabelValues(s.Name, location.Name, s.ServerType.Name).Set(0)
+			serverTraffic.monthly.WithLabelValues(s.Name, location.Name, s.ServerType.Name).Set(0)
+			break
+		}
+
+		monthlyPrice := math.Ceil(float64(additionalTraffic)/sizeTB) * trafficPrice
+		hourlyPrice := pricingPerHour(monthlyPrice)
+
+		serverTraffic.hourly.WithLabelValues(s.Name, location.Name, s.ServerType.Name).Set(hourlyPrice)
+		serverTraffic.monthly.WithLabelValues(s.Name, location.Name, s.ServerType.Name).Set(monthlyPrice)
+	}
+
+	return nil
+}

fetcher/snapshot.go

@@ -0,0 +1,40 @@
+package fetcher
+
+import (
+	"math"
+
+	"github.com/hetznercloud/hcloud-go/hcloud"
+)
+
+const (
+	imagePrice = 0.0119
+)
+
+var _ Fetcher = &snapshot{}
+
+func NewSnapshot() Fetcher {
+	return &snapshot{new("snapshot")}
+}
+
+type snapshot struct {
+	*baseFetcher
+}
+
+func (snapshot snapshot) Run(client *hcloud.Client) error {
+	images, _, err := client.Image.List(ctx, hcloud.ImageListOpts{})
+	if err != nil {
+		return err
+	}
+
+	for _, i := range images {
+		if i.Type == "snapshot" {
+			monthlyPrice := math.Ceil(float64(i.ImageSize)/sizeGB) * imagePrice
+			hourlyPrice := pricingPerHour(monthlyPrice)
+
+			snapshot.hourly.WithLabelValues(i.Name).Set(hourlyPrice)
+			snapshot.monthly.WithLabelValues(i.Name).Set(monthlyPrice)
+		}
+	}
+
+	return nil
+}

fetcher/utils.go

@@ -0,0 +1,42 @@
+package fetcher
+
+import (
+	"strconv"
+	"time"
+
+	"github.com/prometheus/client_golang/prometheus"
+)
+
+const (
+	sizeGB = 1 << (10 * 3)
+	sizeTB = 1 << (10 * 4)
+)
+
+func daysInMonth() int {
+	now := time.Now()
+
+	switch now.Month() {
+	case time.April, time.June, time.September, time.November:
+		return 30
+	case time.February:
+		year := now.Year()
+		if year%4 == 0 && (year%100 != 0 || year%400 == 0) {
+			return 29
+		}
+		return 28
+	default:
+		return 31
+	}
+}
+
+func pricingPerHour(monthlyPrice float64) float64 {
+	return monthlyPrice / float64(daysInMonth()) / 24
+}
+
+func parseToGauge(gauge prometheus.Gauge, value string) {
+	parsed, err := strconv.ParseFloat(value, 32)
+	if err != nil {
+		panic(err)
+	}
+	gauge.Set(parsed)
+}

fetcher/volume.go

@@ -0,0 +1,39 @@
+package fetcher
+
+import (
+	"math"
+	"strconv"
+
+	"github.com/hetznercloud/hcloud-go/hcloud"
+)
+
+const (
+	volumePrice = float64(0.0476)
+)
+
+var _ Fetcher = &volume{}
+
+func NewVolume() Fetcher {
+	return &server{new("volume", "location", "bytes")}
+}
+
+type volume struct {
+	*baseFetcher
+}
+
+func (volume volume) Run(client *hcloud.Client) error {
+	volumes, _, err := client.Volume.List(ctx, hcloud.VolumeListOpts{})
+	if err != nil {
+		return err
+	}
+
+	for _, v := range volumes {
+		monthlyPrice := math.Ceil(float64(v.Size/sizeGB)) * volumePrice
+		hourlyPrice := pricingPerHour(monthlyPrice)
+
+		volume.hourly.WithLabelValues(v.Name, v.Location.Name, strconv.Itoa(v.Size)).Set(hourlyPrice)
+		volume.monthly.WithLabelValues(v.Name, v.Location.Name, strconv.Itoa(v.Size)).Set(monthlyPrice)
+	}
+
+	return nil
+}

go.mod

@@ -1,3 +1,9 @@
-module "github.com/jangraefen/hcloud-pricing-exporter"
+module github.com/jangraefen/hcloud-pricing-exporter
 
 go 1.16
+
+require (
+	github.com/hetznercloud/hcloud-go v1.23.1 // indirect
+	github.com/jtaczanowski/go-scheduler v0.1.0 // indirect
+	github.com/prometheus/client_golang v1.9.0 // indirect
+)

go.sum

@@ -0,0 +1,394 @@
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main.go

@@ -0,0 +1,92 @@
+package main
+
+import (
+	"flag"
+	"fmt"
+	"net/http"
+	"os"
+	"time"
+
+	"github.com/hetznercloud/hcloud-go/hcloud"
+	"github.com/jangraefen/hcloud-pricing-exporter/fetcher"
+	"github.com/jtaczanowski/go-scheduler"
+	"github.com/prometheus/client_golang/prometheus"
+	"github.com/prometheus/client_golang/prometheus/promhttp"
+)
+
+const (
+	defaultPort          = 8080
+	defaultFetchInterval = 1 * time.Minute
+)
+
+var (
+	floatingIP    = fetcher.NewFloatingIP()
+	loadBalancer  = fetcher.NewLoadbalancer()
+	server        = fetcher.NewServer()
+	serverBackup  = fetcher.NewServerBackup()
+	serverTraffic = fetcher.NewServerTraffic()
+	snapshot      = fetcher.NewSnapshot()
+	volume        = fetcher.NewVolume()
+)
+
+func toScheduler(client *hcloud.Client, f func(*hcloud.Client) error) func() {
+	return func() {
+		if err := f(client); err != nil {
+			panic(err)
+		}
+	}
+}
+
+func main() {
+	var (
+		hcloudAPIToken string
+		port           uint
+		fetchInterval  time.Duration
+	)
+
+	flag.StringVar(&hcloudAPIToken, "hcloud-token", "", "the token to authenticate against the HCloud API")
+	flag.UintVar(&port, "port", defaultPort, "the port that the exporter exposes its data on")
+	flag.DurationVar(&fetchInterval, "fetch-interval", defaultFetchInterval, "the interval between data fetching cycles")
+	flag.Parse()
+
+	if hcloudAPIToken == "" {
+		if envHCloudAPIToken, present := os.LookupEnv("HCLOUD_TOKEN"); present {
+			hcloudAPIToken = envHCloudAPIToken
+		}
+	}
+	if hcloudAPIToken == "" {
+		panic(fmt.Errorf("no API token for HCloud specified, but required"))
+	}
+
+	client := hcloud.NewClient(hcloud.WithToken(hcloudAPIToken))
+	scheduler.RunTaskAtInterval(toScheduler(client, floatingIP.Run), fetchInterval, 0)
+	scheduler.RunTaskAtInterval(toScheduler(client, loadBalancer.Run), fetchInterval, 0)
+	scheduler.RunTaskAtInterval(toScheduler(client, server.Run), fetchInterval, 0)
+	scheduler.RunTaskAtInterval(toScheduler(client, serverBackup.Run), fetchInterval, 0)
+	scheduler.RunTaskAtInterval(toScheduler(client, serverTraffic.Run), fetchInterval, 0)
+	scheduler.RunTaskAtInterval(toScheduler(client, snapshot.Run), fetchInterval, 0)
+	scheduler.RunTaskAtInterval(toScheduler(client, volume.Run), fetchInterval, 0)
+
+	registry := prometheus.NewRegistry()
+	registry.MustRegister(
+		floatingIP.GetHourly(),
+		floatingIP.GetMonthly(),
+		loadBalancer.GetHourly(),
+		loadBalancer.GetMonthly(),
+		server.GetHourly(),
+		server.GetMonthly(),
+		serverBackup.GetHourly(),
+		serverBackup.GetMonthly(),
+		serverTraffic.GetHourly(),
+		serverTraffic.GetMonthly(),
+		snapshot.GetHourly(),
+		snapshot.GetMonthly(),
+		volume.GetHourly(),
+		volume.GetMonthly(),
+	)
+
+	http.Handle("/metrics", promhttp.HandlerFor(registry, promhttp.HandlerOpts{}))
+	if err := http.ListenAndServe(fmt.Sprintf(":%d", port), nil); err != nil {
+		panic(err)
+	}
+}