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pihole-exporter
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Merge pull request #110 from Galorhallen/async 

Connection to Pi-Hole(s) handled in goroutine
This commit is contained in:
Vincent Composieux 2022-02-20 15:11:58 +01:00 committed by GitHub
parent 5242c87cea c2437c8246
commit 5ca28527b1
No known key found for this signature in database
GPG Key ID: 4AEE18F83AFDEB23
8 changed files with 116 additions and 65 deletions
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14
README.md
View File

@ -43,7 +43,6 @@ You can run it using the following example and pass configuration environment va
$ docker run \
-e 'PIHOLE_HOSTNAME=192.168.1.2' \
-e 'PIHOLE_PASSWORD=mypassword' \
-e 'INTERVAL=30s' \
-e 'PORT=9617' \
-p 9617:9617 \
ekofr/pihole-exporter:latest
@ -56,7 +55,6 @@ $ API_TOKEN=$(awk -F= -v key="WEBPASSWORD" '$1==key {print $2}' /etc/pihole/setu
$ docker run \
-e 'PIHOLE_HOSTNAME=192.168.1.2' \
-e "PIHOLE_API_TOKEN=$API_TOKEN" \
-e 'INTERVAL=30s' \
-e 'PORT=9617' \
ekofr/pihole-exporter:latest
```
@ -69,7 +67,6 @@ $ docker run \
-e 'PIHOLE_PROTOCOL=https' \
-e 'PIHOLE_HOSTNAME=192.168.1.2' \
-e 'PIHOLE_PASSWORD=mypassword' \
-e 'INTERVAL=30s' \
-e 'PORT=9617' \
-v '/etc/ssl/certs:/etc/ssl/certs:ro' \
-p 9617:9617 \
@ -85,7 +82,6 @@ $ docker run \
-e 'PIHOLE_HOSTNAME="192.168.1.2,192.168.1.3,192.168.1.4"' \
-e "PIHOLE_API_TOKEN="$API_TOKEN1,$API_TOKEN2,$API_TOKEN3" \
-e "PIHOLE_PORT="8080,8081,8080" \
-e 'INTERVAL=30s' \
-e 'PORT=9617' \
ekofr/pihole-exporter:latest
```
@ -98,7 +94,6 @@ $ docker run \
-e 'PIHOLE_HOSTNAME="192.168.1.2,192.168.1.3,192.168.1.4"' \
-e "PIHOLE_API_TOKEN="$API_TOKEN" \
-e "PIHOLE_PORT="8080" \
-e 'INTERVAL=30s' \
-e 'PORT=9617' \
ekofr/pihole-exporter:latest
```
@ -147,7 +142,7 @@ $ ./pihole_exporter -pihole_hostname 192.168.1.10 -pihole_api_token $API_TOKEN
2019/05/09 20:19:52 PIHoleHostname : 192.168.1.10
2019/05/09 20:19:52 PIHolePassword : azerty
2019/05/09 20:19:52 Port : 9617
2019/05/09 20:19:52 Interval : 10s
2019/05/09 20:19:52 Timeout : 5s
2019/05/09 20:19:52 ------------------------------------
2019/05/09 20:19:52 New Prometheus metric registered: domains_blocked
2019/05/09 20:19:52 New Prometheus metric registered: dns_queries_today
@ -182,15 +177,14 @@ scrape_configs:
## Available CLI options
```bash
# Interval of time the exporter will fetch data from PI-Hole
-interval duration (optional) (default 10s)
# Hostname of the Raspberry PI where PI-Hole is installed
# Hostname of the host(s) where PI-Hole is installed
-pihole_hostname string (optional) (default "127.0.0.1")
# Password defined on the PI-Hole interface
-pihole_password string (optional)
# Timeout to connect and retrieve data from a Pi-Hole instance
-timeout duration (optional) (default 5s)
# WEBPASSWORD / api token defined on the PI-Hole interface at `/etc/pihole/setupVars.conf`
-pihole_api_token string (optional)

30
config/configuration.go
View File

@ -4,11 +4,12 @@ import (
"context"
"errors"
"fmt"
"log"
"reflect"
"strings"
"time"
log "github.com/sirupsen/logrus"
"github.com/heetch/confita"
"github.com/heetch/confita/backend"
"github.com/heetch/confita/backend/env"
@ -31,7 +32,7 @@ type EnvConfig struct {
PIHolePassword []string `config:"pihole_password"`
PIHoleApiToken []string `config:"pihole_api_token"`
Port uint16 `config:"port"`
Interval time.Duration `config:"interval"`
Timeout time.Duration `config:"timeout"`
}
func getDefaultEnvConfig() *EnvConfig {
@ -42,7 +43,7 @@ func getDefaultEnvConfig() *EnvConfig {
PIHolePassword: []string{},
PIHoleApiToken: []string{},
Port: 9617,
Interval: 10 * time.Second,
Timeout: 5 * time.Second,
}
}
@ -85,6 +86,7 @@ func (c *Config) String() string {
}
}
buffer = removeEmptyString(buffer)
return fmt.Sprintf("<Config@%X %s>", &c, strings.Join(buffer, ", "))
}
@ -156,6 +158,16 @@ func extractStringConfig(data []string, idx int, hostsCount int) (bool, string,
return false, "", true
}
func removeEmptyString(source []string) []string {
var result []string
for _, s := range source {
if s != "" {
result = append(result, s)
}
}
return result
}
func (c Config) hostnameURL() string {
s := fmt.Sprintf("%s://%s", c.PIHoleProtocol, c.PIHoleHostname)
if c.PIHolePort != 0 {
@ -176,25 +188,25 @@ func (c Config) PIHoleLoginURL() string {
func (c EnvConfig) show() {
val := reflect.ValueOf(&c).Elem()
log.Println("------------------------------------")
log.Println("- PI-Hole exporter configuration -")
log.Println("------------------------------------")
log.Info("------------------------------------")
log.Info("- PI-Hole exporter configuration -")
log.Info("------------------------------------")
for i := 0; i < val.NumField(); i++ {
valueField := val.Field(i)
typeField := val.Type().Field(i)
// Do not print password or api token but do print the authentication method
if typeField.Name != "PIHolePassword" && typeField.Name != "PIHoleApiToken" {
log.Println(fmt.Sprintf("%s : %v", typeField.Name, valueField.Interface()))
log.Info(fmt.Sprintf("%s : %v", typeField.Name, valueField.Interface()))
} else {
showAuthenticationMethod(typeField.Name, valueField.Len())
}
}
log.Println("------------------------------------")
log.Info("------------------------------------")
}
func showAuthenticationMethod(name string, length int) {
if length > 0 {
log.Println(fmt.Sprintf("Pi-Hole Authentication Method : %s", name))
log.Info(fmt.Sprintf("Pi-Hole Authentication Method : %s", name))
}
}

2
go.mod
View File

@ -5,6 +5,7 @@ go 1.17
require (
github.com/heetch/confita v0.10.0
github.com/prometheus/client_golang v1.12.1
github.com/sirupsen/logrus v1.6.0
github.com/stretchr/testify v1.7.0
github.com/xonvanetta/shutdown v0.0.3
golang.org/x/net v0.0.0-20210525063256-abc453219eb5
@ -15,6 +16,7 @@ require (
github.com/cespare/xxhash/v2 v2.1.2 // indirect
github.com/davecgh/go-spew v1.1.1 // indirect
github.com/golang/protobuf v1.5.2 // indirect
github.com/konsorten/go-windows-terminal-sequences v1.0.3 // indirect
github.com/matttproud/golang_protobuf_extensions v1.0.1 // indirect
github.com/pkg/errors v0.9.1 // indirect
github.com/pmezard/go-difflib v1.0.0 // indirect

2
go.sum
View File

@ -199,6 +199,7 @@ github.com/julienschmidt/httprouter v1.2.0/go.mod h1:SYymIcj16QtmaHHD7aYtjjsJG7V
github.com/julienschmidt/httprouter v1.3.0/go.mod h1:JR6WtHb+2LUe8TCKY3cZOxFyyO8IZAc4RVcycCCAKdM=
github.com/kisielk/gotool v1.0.0/go.mod h1:XhKaO+MFFWcvkIS/tQcRk01m1F5IRFswLeQ+oQHNcck=
github.com/konsorten/go-windows-terminal-sequences v1.0.1/go.mod h1:T0+1ngSBFLxvqU3pZ+m/2kptfBszLMUkC4ZK/EgS/cQ=
github.com/konsorten/go-windows-terminal-sequences v1.0.3 h1:CE8S1cTafDpPvMhIxNJKvHsGVBgn1xWYf1NbHQhywc8=
github.com/konsorten/go-windows-terminal-sequences v1.0.3/go.mod h1:T0+1ngSBFLxvqU3pZ+m/2kptfBszLMUkC4ZK/EgS/cQ=
github.com/kr/logfmt v0.0.0-20140226030751-b84e30acd515/go.mod h1:+0opPa2QZZtGFBFZlji/RkVcI2GknAs/DXo4wKdlNEc=
github.com/kr/pretty v0.1.0 h1:L/CwN0zerZDmRFUapSPitk6f+Q3+0za1rQkzVuMiMFI=
@ -278,6 +279,7 @@ github.com/ryanuber/go-glob v1.0.0/go.mod h1:807d1WSdnB0XRJzKNil9Om6lcp/3a0v4qIH
github.com/sean-/seed v0.0.0-20170313163322-e2103e2c3529/go.mod h1:DxrIzT+xaE7yg65j358z/aeFdxmN0P9QXhEzd20vsDc=
github.com/sirupsen/logrus v1.2.0/go.mod h1:LxeOpSwHxABJmUn/MG1IvRgCAasNZTLOkJPxbbu5VWo=
github.com/sirupsen/logrus v1.4.2/go.mod h1:tLMulIdttU9McNUspp0xgXVQah82FyeX6MwdIuYE2rE=
github.com/sirupsen/logrus v1.6.0 h1:UBcNElsrwanuuMsnGSlYmtmgbb23qDR5dG+6X6Oo89I=
github.com/sirupsen/logrus v1.6.0/go.mod h1:7uNnSEd1DgxDLC74fIahvMZmmYsHGZGEOFrfsX/uA88=
github.com/soheilhy/cmux v0.1.4/go.mod h1:IM3LyeVVIOuxMH7sFAkER9+bJ4dT7Ms6E4xg4kGIyLM=
github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=

5
internal/metrics/metrics.go
View File

@ -1,9 +1,8 @@
package metrics
import (
"log"
"github.com/prometheus/client_golang/prometheus"
log "github.com/sirupsen/logrus"
)
var (
@ -201,5 +200,5 @@ func Init() {
func initMetric(name string, metric *prometheus.GaugeVec) {
prometheus.MustRegister(metric)
log.Printf("New Prometheus metric registered: %s", name)
log.Info("New Prometheus metric registered: ", name)
}

64
internal/pihole/client.go
View File

@ -4,7 +4,6 @@ import (
"encoding/json"
"fmt"
"io/ioutil"
"log"
"net/http"
"net/url"
"os"
@ -12,22 +11,51 @@ import (
"strings"
"time"
log "github.com/sirupsen/logrus"
"github.com/eko/pihole-exporter/config"
"github.com/eko/pihole-exporter/internal/metrics"
)
type ClientStatus byte
const (
MetricsCollectionInProgress ClientStatus = iota
MetricsCollectionSuccess
MetricsCollectionError
MetricsCollectionTimeout
)
func (status ClientStatus) String() string {
return []string{"MetricsCollectionInProgress", "MetricsCollectionSuccess", "MetricsCollectionError", "MetricsCollectionTimeout"}[status]
}
type ClientChannel struct {
Status ClientStatus
Err error
}
func (c *ClientChannel) String() string {
if c.Err != nil {
return fmt.Sprintf("ClientChannel<Status: %s, Err: '%s'>", c.Status, c.Err.Error())
} else {
return fmt.Sprintf("ClientChannel<Status: %s, Err: <nil>>", c.Status)
}
}
// 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
config *config.Config
Status chan *ClientChannel
}
// NewClient method initializes a new PI-Hole client.
func NewClient(config *config.Config) *Client {
func NewClient(config *config.Config, envConfig *config.EnvConfig) *Client {
err := config.Validate()
if err != nil {
log.Print(err)
log.Error(err)
os.Exit(1)
}
@ -39,7 +67,9 @@ func NewClient(config *config.Config) *Client {
CheckRedirect: func(req *http.Request, via []*http.Request) error {
return http.ErrUseLastResponse
},
Timeout: envConfig.Timeout,
},
Status: make(chan *ClientChannel, 1),
}
}
@ -47,32 +77,24 @@ func (c *Client) String() string {
return c.config.PIHoleHostname
}
/*
// 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
}
func (c *Client) CollectMetricsAsync(writer http.ResponseWriter, request *http.Request) {
log.Printf("Collecting from %s", c.config.PIHoleHostname)
if stats, err := c.getStatistics(); err == nil {
c.setMetrics(stats)
log.Printf("New tick of statistics: %s", stats.ToString())
promhttp.Handler().ServeHTTP(writer, request)
c.Status <- &ClientChannel{Status: MetricsCollectionSuccess, Err: nil}
log.Printf("New tick of statistics from %s: %s", c.config.PIHoleHostname, stats)
} else {
c.Status <- &ClientChannel{Status: MetricsCollectionError, Err: err}
}
}*/
}
func (c *Client) CollectMetrics(writer http.ResponseWriter, request *http.Request) error {
stats, err := c.getStatistics()
if err != nil {
return err
}
c.setMetrics(stats)
log.Printf("New tick of statistics from %s: %s", c, stats)
log.Printf("New tick of statistics from %s: %s", c.config.PIHoleHostname, stats)
return nil
}
@ -137,7 +159,7 @@ func (c *Client) getPHPSessionID() (sessionID string) {
resp, err := c.httpClient.Do(req)
if err != nil {
log.Printf("An error has occured during login to PI-Hole: %v", err)
log.Errorf("An error has occured during login to PI-Hole: %v", err)
}
for _, cookie := range resp.Cookies() {

58
internal/server/server.go
View File

@ -2,7 +2,6 @@ package server
import (
"fmt"
"log"
"net/http"
"strconv"
"strings"
@ -10,6 +9,7 @@ import (
"github.com/eko/pihole-exporter/internal/pihole"
"github.com/prometheus/client_golang/prometheus/promhttp"
log "github.com/sirupsen/logrus"
"golang.org/x/net/context"
)
@ -22,32 +22,31 @@ type Server struct {
// the different routes that will be used by Prometheus (metrics) or for monitoring (readiness, liveness).
func NewServer(port uint16, clients []*pihole.Client) *Server {
mux := http.NewServeMux()
httpServer := &http.Server{Addr: ":" + strconv.Itoa(int(port)), Handler: mux}
httpServer := &http.Server{
Addr: ":" + strconv.Itoa(int(port)),
Handler: mux,
}
s := &Server{
httpServer: httpServer,
}
mux.HandleFunc("/metrics",
func(writer http.ResponseWriter, request *http.Request) {
errors := make([]string, 0)
mux.HandleFunc("/metrics", func(writer http.ResponseWriter, request *http.Request) {
log.Printf("request.Header: %v\n", request.Header)
for _, client := range clients {
if err := client.CollectMetrics(writer, request); err != nil {
errors = append(errors, err.Error())
fmt.Printf("Error %s\n", err)
}
for _, client := range clients {
go client.CollectMetricsAsync(writer, request)
}
for _, client := range clients {
status := <-client.Status
if status.Status == pihole.MetricsCollectionError {
log.Printf("An error occured while contacting %s: %s", client.GetHostname(), status.Err.Error())
}
}
if len(errors) == len(clients) {
writer.WriteHeader(http.StatusBadRequest)
body := strings.Join(errors, "\n")
_, _ = writer.Write([]byte(body))
}
promhttp.Handler().ServeHTTP(writer, request)
},
)
promhttp.Handler().ServeHTTP(writer, request)
})
mux.Handle("/readiness", s.readinessHandler())
mux.Handle("/liveness", s.livenessHandler())
@ -73,6 +72,27 @@ func (s *Server) Stop() {
s.httpServer.Shutdown(ctx)
}
func (s *Server) handleMetrics(clients []*pihole.Client) http.HandlerFunc {
return func(writer http.ResponseWriter, request *http.Request) {
errors := make([]string, 0)
for _, client := range clients {
if err := client.CollectMetrics(writer, request); err != nil {
errors = append(errors, err.Error())
fmt.Printf("Error %s\n", err)
}
}
if len(errors) == len(clients) {
writer.WriteHeader(http.StatusBadRequest)
body := strings.Join(errors, "\n")
_, _ = writer.Write([]byte(body))
}
promhttp.Handler().ServeHTTP(writer, request)
}
}
func (s *Server) readinessHandler() http.HandlerFunc {
return func(w http.ResponseWriter, req *http.Request) {
if s.isReady() {

6
main.go
View File

@ -20,7 +20,7 @@ func main() {
serverDead := make(chan struct{})
clients := buildClients(clientConfigs)
clients := buildClients(clientConfigs, envConf)
s := server.NewServer(envConf.Port, clients)
go func() {
@ -43,12 +43,12 @@ func main() {
log.Println("pihole-exporter HTTP server stopped")
}
func buildClients(clientConfigs []config.Config) []*pihole.Client {
func buildClients(clientConfigs []config.Config, envConfig *config.EnvConfig) []*pihole.Client {
clients := make([]*pihole.Client, 0, len(clientConfigs))
for i := range clientConfigs {
clientConfig := &clientConfigs[i]
client := pihole.NewClient(clientConfig)
client := pihole.NewClient(clientConfig, envConfig)
clients = append(clients, client)
}
return clients