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only scrape when asked

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will only scape metrics on pihole when asked on /metrics
allow port 0 to be used when using strict https redirects

Resolves: #49
This commit is contained in:
Vanetta 2021-08-16 23:55:05 +02:00
parent ad8778b523
commit 26ddc36a4e
6 changed files with 112 additions and 105 deletions
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26
config/configuration.go
View File

@ -56,6 +56,32 @@ func Load() *Config {
return cfg
}
//Validate check if the config is valid
func (c Config) Validate() error {
if c.PIHoleProtocol != "http" && c.PIHoleProtocol != "https" {
return fmt.Errorf("protocol %s is invalid. Must be http or https", c.PIHoleProtocol)
}
return nil
}
func (c Config) hostnameURL() string {
s := fmt.Sprintf("%s://%s", c.PIHoleProtocol, c.PIHoleHostname)
if c.PIHolePort != 0 {
s += fmt.Sprintf(":%d", c.PIHolePort)
}
return s
}
//PIHoleStatsURL returns the stats url
func (c Config) PIHoleStatsURL() string {
return c.hostnameURL() + "/admin/api.php?summaryRaw&overTimeData&topItems&recentItems&getQueryTypes&getForwardDestinations&getQuerySources&jsonForceObject"
}
//PIHoleLoginURL returns the login url
func (c Config) PIHoleLoginURL() string {
return c.hostnameURL() + "/admin/index.php?login"
}
func (c Config) show() {
val := reflect.ValueOf(&c).Elem()
log.Println("------------------------------------")

1
go.mod
View File

@ -5,5 +5,6 @@ go 1.15
require (
github.com/heetch/confita v0.10.0
github.com/prometheus/client_golang v1.11.0
github.com/xonvanetta/shutdown v0.0.2
golang.org/x/net v0.0.0-20200625001655-4c5254603344
)

8
go.sum
View File

@ -198,12 +198,15 @@ github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+
github.com/stretchr/objx v0.1.1/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
github.com/stretchr/testify v1.2.2/go.mod h1:a8OnRcib4nhh0OaRAV+Yts87kKdq0PP7pXfy6kDkUVs=
github.com/stretchr/testify v1.3.0/go.mod h1:M5WIy9Dh21IEIfnGCwXGc5bZfKNJtfHm1UVUgZn+9EI=
github.com/stretchr/testify v1.4.0 h1:2E4SXV/wtOkTonXsotYi4li6zVWxYlZuYNCXe9XRJyk=
github.com/stretchr/testify v1.4.0/go.mod h1:j7eGeouHqKxXV5pUuKE4zz7dFj8WfuZ+81PSLYec5m4=
github.com/stretchr/testify v1.6.0 h1:jlIyCplCJFULU/01vCkhKuTyc3OorI3bJFuw6obfgho=
github.com/stretchr/testify v1.6.0/go.mod h1:6Fq8oRcR53rry900zMqJjRRixrwX3KX962/h/Wwjteg=
github.com/tmc/grpc-websocket-proxy v0.0.0-20190109142713-0ad062ec5ee5/go.mod h1:ncp9v5uamzpCO7NfCPTXjqaC+bZgJeR0sMTm6dMHP7U=
github.com/tv42/httpunix v0.0.0-20150427012821-b75d8614f926/go.mod h1:9ESjWnEqriFuLhtthL60Sar/7RFoluCcXsuvEwTV5KM=
github.com/ugorji/go v1.1.4/go.mod h1:uQMGLiO92mf5W77hV/PUCpI3pbzQx3CRekS0kk+RGrc=
github.com/xiang90/probing v0.0.0-20190116061207-43a291ad63a2/go.mod h1:UETIi67q53MR2AWcXfiuqkDkRtnGDLqkBTpCHuJHxtU=
github.com/xonvanetta/shutdown v0.0.2 h1:FTbzm/55K8GPgaFdllI71V/cH7IRsyNJD6Z3JVR66Zs=
github.com/xonvanetta/shutdown v0.0.2/go.mod h1:bYnVnX8ITK2E9GpuH/YVfctve/d5oOIvWsyhFj/N450=
go.etcd.io/bbolt v1.3.2/go.mod h1:IbVyRI1SCnLcuJnV2u8VeU0CEYM7e686BmAb1XKL+uU=
golang.org/x/crypto v0.0.0-20180904163835-0709b304e793/go.mod h1:6SG95UA2DQfeDnfUPMdvaQW0Q7yPrPDi9nlGo2tz2b4=
golang.org/x/crypto v0.0.0-20181029021203-45a5f77698d3/go.mod h1:6SG95UA2DQfeDnfUPMdvaQW0Q7yPrPDi9nlGo2tz2b4=
@ -296,7 +299,8 @@ gopkg.in/yaml.v2 v2.2.1/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
gopkg.in/yaml.v2 v2.2.2/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
gopkg.in/yaml.v2 v2.2.4/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
gopkg.in/yaml.v2 v2.2.5/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
gopkg.in/yaml.v2 v2.3.0 h1:clyUAQHOM3G0M3f5vQj7LuJrETvjVot3Z5el9nffUtU=
gopkg.in/yaml.v2 v2.3.0/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c h1:dUUwHk2QECo/6vqA44rthZ8ie2QXMNeKRTHCNY2nXvo=
gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
honnef.co/go/tools v0.0.0-20190102054323-c2f93a96b099/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
honnef.co/go/tools v0.0.0-20190523083050-ea95bdfd59fc/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=

113
internal/pihole/client.go
View File

@ -12,40 +12,28 @@ import (
"strings"
"time"
"github.com/eko/pihole-exporter/config"
"github.com/eko/pihole-exporter/internal/metrics"
)
var (
loginURLPattern = "%s://%s:%d/admin/index.php?login"
statsURLPattern = "%s://%s:%d/admin/api.php?summaryRaw&overTimeData&topItems&recentItems&getQueryTypes&getForwardDestinations&getQuerySources&jsonForceObject"
"github.com/prometheus/client_golang/prometheus/promhttp"
)
// Client struct is a PI-Hole client to request an instance of a PI-Hole ad blocker.
type Client struct {
httpClient http.Client
interval time.Duration
protocol string
hostname string
port uint16
password string
sessionID string
apiToken string
config *config.Config
}
// NewClient method initializes a new PI-Hole client.
func NewClient(protocol, hostname string, port uint16, password, apiToken string, interval time.Duration) *Client {
if protocol != "http" && protocol != "https" {
log.Printf("protocol %s is invalid. Must be http or https.", protocol)
func NewClient(config *config.Config) *Client {
err := config.Validate()
if err != nil {
log.Print(err)
os.Exit(1)
}
return &Client{
protocol: protocol,
hostname: hostname,
port: port,
password: password,
apiToken: apiToken,
interval: interval,
config: config,
httpClient: http.Client{
CheckRedirect: func(req *http.Request, via []*http.Request) error {
return http.ErrUseLastResponse
@ -54,67 +42,70 @@ func NewClient(protocol, hostname string, port uint16, password, apiToken string
}
}
// Scrape method authenticates and retrieves statistics from PI-Hole JSON API
// and then pass them as Prometheus metrics.
func (c *Client) Scrape() {
for range time.Tick(c.interval) {
stats := c.getStatistics()
// Metrics scrapes pihole and sets them
func (c *Client) Metrics() http.HandlerFunc {
return func(writer http.ResponseWriter, request *http.Request) {
stats, err := c.getStatistics()
if err != nil {
writer.WriteHeader(http.StatusBadRequest)
_, _ = writer.Write([]byte(err.Error()))
return
}
c.setMetrics(stats)
log.Printf("New tick of statistics: %s", stats.ToString())
promhttp.Handler().ServeHTTP(writer, request)
}
}
func (c *Client) setMetrics(stats *Stats) {
metrics.DomainsBlocked.WithLabelValues(c.hostname).Set(float64(stats.DomainsBeingBlocked))
metrics.DNSQueriesToday.WithLabelValues(c.hostname).Set(float64(stats.DNSQueriesToday))
metrics.AdsBlockedToday.WithLabelValues(c.hostname).Set(float64(stats.AdsBlockedToday))
metrics.AdsPercentageToday.WithLabelValues(c.hostname).Set(float64(stats.AdsPercentageToday))
metrics.UniqueDomains.WithLabelValues(c.hostname).Set(float64(stats.UniqueDomains))
metrics.QueriesForwarded.WithLabelValues(c.hostname).Set(float64(stats.QueriesForwarded))
metrics.QueriesCached.WithLabelValues(c.hostname).Set(float64(stats.QueriesCached))
metrics.ClientsEverSeen.WithLabelValues(c.hostname).Set(float64(stats.ClientsEverSeen))
metrics.UniqueClients.WithLabelValues(c.hostname).Set(float64(stats.UniqueClients))
metrics.DNSQueriesAllTypes.WithLabelValues(c.hostname).Set(float64(stats.DNSQueriesAllTypes))
metrics.DomainsBlocked.WithLabelValues(c.config.PIHoleHostname).Set(float64(stats.DomainsBeingBlocked))
metrics.DNSQueriesToday.WithLabelValues(c.config.PIHoleHostname).Set(float64(stats.DNSQueriesToday))
metrics.AdsBlockedToday.WithLabelValues(c.config.PIHoleHostname).Set(float64(stats.AdsBlockedToday))
metrics.AdsPercentageToday.WithLabelValues(c.config.PIHoleHostname).Set(float64(stats.AdsPercentageToday))
metrics.UniqueDomains.WithLabelValues(c.config.PIHoleHostname).Set(float64(stats.UniqueDomains))
metrics.QueriesForwarded.WithLabelValues(c.config.PIHoleHostname).Set(float64(stats.QueriesForwarded))
metrics.QueriesCached.WithLabelValues(c.config.PIHoleHostname).Set(float64(stats.QueriesCached))
metrics.ClientsEverSeen.WithLabelValues(c.config.PIHoleHostname).Set(float64(stats.ClientsEverSeen))
metrics.UniqueClients.WithLabelValues(c.config.PIHoleHostname).Set(float64(stats.UniqueClients))
metrics.DNSQueriesAllTypes.WithLabelValues(c.config.PIHoleHostname).Set(float64(stats.DNSQueriesAllTypes))
metrics.Reply.WithLabelValues(c.hostname, "no_data").Set(float64(stats.ReplyNoData))
metrics.Reply.WithLabelValues(c.hostname, "nx_domain").Set(float64(stats.ReplyNxDomain))
metrics.Reply.WithLabelValues(c.hostname, "cname").Set(float64(stats.ReplyCname))
metrics.Reply.WithLabelValues(c.hostname, "ip").Set(float64(stats.ReplyIP))
metrics.Reply.WithLabelValues(c.config.PIHoleHostname, "no_data").Set(float64(stats.ReplyNoData))
metrics.Reply.WithLabelValues(c.config.PIHoleHostname, "nx_domain").Set(float64(stats.ReplyNxDomain))
metrics.Reply.WithLabelValues(c.config.PIHoleHostname, "cname").Set(float64(stats.ReplyCname))
metrics.Reply.WithLabelValues(c.config.PIHoleHostname, "ip").Set(float64(stats.ReplyIP))
var isEnabled int = 0
if stats.Status == enabledStatus {
isEnabled = 1
}
metrics.Status.WithLabelValues(c.hostname).Set(float64(isEnabled))
metrics.Status.WithLabelValues(c.config.PIHoleHostname).Set(float64(isEnabled))
for domain, value := range stats.TopQueries {
metrics.TopQueries.WithLabelValues(c.hostname, domain).Set(float64(value))
metrics.TopQueries.WithLabelValues(c.config.PIHoleHostname, domain).Set(float64(value))
}
for domain, value := range stats.TopAds {
metrics.TopAds.WithLabelValues(c.hostname, domain).Set(float64(value))
metrics.TopAds.WithLabelValues(c.config.PIHoleHostname, domain).Set(float64(value))
}
for source, value := range stats.TopSources {
metrics.TopSources.WithLabelValues(c.hostname, source).Set(float64(value))
metrics.TopSources.WithLabelValues(c.config.PIHoleHostname, source).Set(float64(value))
}
for destination, value := range stats.ForwardDestinations {
metrics.ForwardDestinations.WithLabelValues(c.hostname, destination).Set(value)
metrics.ForwardDestinations.WithLabelValues(c.config.PIHoleHostname, destination).Set(value)
}
for queryType, value := range stats.QueryTypes {
metrics.QueryTypes.WithLabelValues(c.hostname, queryType).Set(value)
metrics.QueryTypes.WithLabelValues(c.config.PIHoleHostname, queryType).Set(value)
}
}
func (c *Client) getPHPSessionID() (sessionID string) {
loginURL := fmt.Sprintf(loginURLPattern, c.protocol, c.hostname, c.port)
values := url.Values{"pw": []string{c.password}}
values := url.Values{"pw": []string{c.config.PIHolePassword}}
req, err := http.NewRequest("POST", loginURL, strings.NewReader(values.Encode()))
req, err := http.NewRequest("POST", c.config.PIHoleLoginURL(), strings.NewReader(values.Encode()))
if err != nil {
log.Fatal("An error has occured when creating HTTP statistics request", err)
}
@ -137,18 +128,18 @@ func (c *Client) getPHPSessionID() (sessionID string) {
return
}
func (c *Client) getStatistics() *Stats {
var stats Stats
func (c *Client) getStatistics() (*Stats, error) {
stats := new(Stats)
statsURL := fmt.Sprintf(statsURLPattern, c.protocol, c.hostname, c.port)
statsURL := c.config.PIHoleStatsURL()
if c.isUsingApiToken() {
statsURL = fmt.Sprintf("%s&auth=%s", statsURL, c.apiToken)
statsURL = fmt.Sprintf("%s&auth=%s", statsURL, c.config.PIHoleApiToken)
}
req, err := http.NewRequest("GET", statsURL, nil)
if err != nil {
log.Fatal("An error has occured when creating HTTP statistics request", err)
return nil, fmt.Errorf("an error has occured when creating HTTP statistics request: %w", err)
}
if c.isUsingPassword() {
@ -157,28 +148,28 @@ func (c *Client) getStatistics() *Stats {
resp, err := c.httpClient.Do(req)
if err != nil {
log.Println("An error has occured during retrieving PI-Hole statistics", err)
return nil, fmt.Errorf("an error has occured during retrieving PI-Hole statistics: %w", err)
}
body, err := ioutil.ReadAll(resp.Body)
if err != nil {
log.Println("Unable to read PI-Hole statistics HTTP response", err)
return nil, fmt.Errorf("unable to read PI-Hole statistics HTTP response: %w", err)
}
err = json.Unmarshal(body, &stats)
err = json.Unmarshal(body, stats)
if err != nil {
log.Println("Unable to unmarshal PI-Hole statistics to statistics struct model", err)
return nil, fmt.Errorf("unable to unmarshal PI-Hole statistics to statistics struct model: %w", err)
}
return &stats
return stats, nil
}
func (c *Client) isUsingPassword() bool {
return len(c.password) > 0
return len(c.config.PIHolePassword) > 0
}
func (c *Client) isUsingApiToken() bool {
return len(c.apiToken) > 0
return len(c.config.PIHoleApiToken) > 0
}
func (c *Client) authenticateRequest(req *http.Request) {

14
internal/server/server.go
View File

@ -5,7 +5,7 @@ import (
"net/http"
"time"
"github.com/prometheus/client_golang/prometheus/promhttp"
"github.com/eko/pihole-exporter/internal/pihole"
"golang.org/x/net/context"
)
@ -16,7 +16,7 @@ type Server struct {
// NewServer method initializes a new HTTP server instance and associates
// the different routes that will be used by Prometheus (metrics) or for monitoring (readiness, liveness).
func NewServer(port string) *Server {
func NewServer(port string, client *pihole.Client) *Server {
mux := http.NewServeMux()
httpServer := &http.Server{Addr: ":" + port, Handler: mux}
@ -24,7 +24,7 @@ func NewServer(port string) *Server {
httpServer: httpServer,
}
mux.Handle("/metrics", promhttp.Handler())
mux.Handle("/metrics", client.Metrics())
mux.Handle("/readiness", s.readinessHandler())
mux.Handle("/liveness", s.livenessHandler())
@ -50,19 +50,19 @@ func (s *Server) Stop() {
}
func (s *Server) readinessHandler() http.HandlerFunc {
return http.HandlerFunc(func(w http.ResponseWriter, req *http.Request) {
return func(w http.ResponseWriter, req *http.Request) {
if s.isReady() {
w.WriteHeader(http.StatusOK)
} else {
w.WriteHeader(http.StatusNotFound)
}
})
}
}
func (s *Server) livenessHandler() http.HandlerFunc {
return http.HandlerFunc(func(w http.ResponseWriter, req *http.Request) {
return func(w http.ResponseWriter, req *http.Request) {
w.WriteHeader(http.StatusOK)
})
}
}
func (s *Server) isReady() bool {

51
main.go
View File

@ -2,23 +2,12 @@ package main
import (
"fmt"
"os"
"os/signal"
"syscall"
"time"
"github.com/eko/pihole-exporter/config"
"github.com/eko/pihole-exporter/internal/metrics"
"github.com/eko/pihole-exporter/internal/pihole"
"github.com/eko/pihole-exporter/internal/server"
)
const (
name = "pihole-exporter"
)
var (
s *server.Server
"github.com/xonvanetta/shutdown/pkg/shutdown"
)
func main() {
@ -26,28 +15,24 @@ func main() {
metrics.Init()
initPiHoleClient(conf.PIHoleProtocol, conf.PIHoleHostname, conf.PIHolePort, conf.PIHolePassword, conf.PIHoleApiToken, conf.Interval)
initHttpServer(conf.Port)
serverDead := make(chan struct{})
s := server.NewServer(conf.Port, pihole.NewClient(conf))
go func() {
s.ListenAndServe()
close(serverDead)
}()
handleExitSignal()
}
func initPiHoleClient(protocol, hostname string, port uint16, password, apiToken string, interval time.Duration) {
client := pihole.NewClient(protocol, hostname, port, password, apiToken, interval)
go client.Scrape()
}
func initHttpServer(port string) {
s = server.NewServer(port)
go s.ListenAndServe()
}
func handleExitSignal() {
stop := make(chan os.Signal, 1)
signal.Notify(stop, os.Interrupt, syscall.SIGTERM)
<-stop
ctx := shutdown.Context()
go func() {
<-ctx.Done()
s.Stop()
fmt.Println(fmt.Sprintf("\n%s HTTP server stopped", name))
}()
select {
case <-ctx.Done():
case <-serverDead:
}
fmt.Println("pihole-exporter HTTP server stopped")
}