.github/CONTRIBUTING.md

@@ -1,6 +1,6 @@
 # Contributing
 
-Pi-hole exporter is an open source project, completely opened to be a community-driven project.
+PI-Hole exporter is an open source project, completely opened to be a community-driven project.
 
 If you'd like to contribute, you are free to do so.
 

.github/dependabot.yml

@@ -1,14 +0,0 @@
-version: 2
-updates:
-- package-ecosystem: gomod
-  directory: "/"
-  schedule:
-    interval: daily
-    time: "04:00"
-  open-pull-requests-limit: 10
-- package-ecosystem: docker
-  directory: "/"
-  schedule:
-    interval: daily
-    time: "04:00"
-  open-pull-requests-limit: 10

.github/main.workflow

@@ -0,0 +1,31 @@
+workflow "Build and Publish" {
+  on = "push"
+  resolves = ["Master", "Docker Push"]
+}
+
+# Filter for master branch
+action "Master" {
+  uses = "actions/bin/filter@master"
+  args = "branch master"
+}
+
+action "Docker Build" {
+  uses = "actions/docker/cli@fe7ed3ce992160973df86480b83a2f8ed581cd50"
+  needs = ["Master"]
+  args = "build -t pihole-exporter ."
+}
+
+action "Docker Registry" {
+  uses = "actions/docker/login@fe7ed3ce992160973df86480b83a2f8ed581cd50"
+  env = {
+    DOCKER_REGISTRY_URL = "docker.pkg.github.com"
+  }
+  secrets = ["DOCKER_PASSWORD", "DOCKER_USERNAME"]
+  needs = ["Docker Build"]
+}
+
+action "Docker Push" {
+  uses = "actions/docker/cli@fe7ed3ce992160973df86480b83a2f8ed581cd50"
+  args = "push pihole-exporter"
+  needs = ["Docker Registry"]
+}

.github/workflows/master.yml

@@ -1,19 +1,22 @@
-name: Test (master)
+name: Build/Push (master)
 
 on:
   push:
     branches:
-      - master
+      - '*'
+  pull_request:
+    branches:
+      - '*'
 
 jobs:
   test:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        go_version: [ '1.20' ]
+        go_version: [ '1.12', '1.13', '1.14' ]
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v2
-      - uses: actions/setup-go@v3
+      - uses: actions/setup-go@v1
         with:
           go-version: ${{ matrix.go_version }}
 
@@ -23,30 +26,31 @@ jobs:
       - name: Run go tests
         run: go test -v -cover -race ./...
 
-  docker-build:
+  build:
     runs-on: ubuntu-latest
     needs: test
+    strategy:
+      matrix:
+        include:
+          - os: linux
+            arch: amd64
+            image: scratch
+          - os: linux
+            arch: arm
+            image: arm32v7/alpine:3.11
+          - os: linux
+            arch: arm64
+            image: arm64v8/alpine:3.11
+
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v2
-      - uses: azure/docker-login@v1
+
+      - name: Build and push docker image (${{ matrix.os }}/${{ matrix.arch }})
+        uses: docker/build-push-action@v1
         with:
           username: ${{ secrets.DOCKER_USERNAME }}
           password: ${{ secrets.DOCKER_PASSWORD }}
+          repository: ekofr/pihole-exporter
+          tags: ${{ matrix.arch }}
+          build_args: OS=${{ matrix.os }},ARCH=${{ matrix.arch }},IMAGE=${{ matrix.image }}
 
-      - name: Set up docker buildx
-        id: buildx
-        uses: crazy-max/ghaction-docker-buildx@v1
-        with:
-          buildx-version: latest
-          qemu-version: latest
-
-      - name: Docker buildx available platforms
-        run: echo ${{ steps.buildx.outputs.platforms }}
-
-      - name: Run docker buildx build
-        run: |
-          docker buildx build \
-            --platform linux/386,linux/amd64,linux/arm/v6,linux/arm/v7,linux/arm64 \
-            --output=type=registry,push=true \
-            --tag ekofr/pihole-exporter:latest \
-            .

.github/workflows/tag.yml

@@ -10,10 +10,10 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        go_version: [ '1.20' ]
+        go_version: [ '1.12', '1.13', '1.14', '1.15' ]
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v2
-      - uses: actions/setup-go@v3
+      - uses: actions/setup-go@v2
         with:
           go-version: ${{ matrix.go_version }}
       - run: go get -t -v ./...
@@ -23,7 +23,7 @@ jobs:
     runs-on: ubuntu-latest
     needs: test
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v2
 
     - uses: azure/docker-login@v1
       with:
@@ -48,7 +48,7 @@ jobs:
       run: |
         docker buildx build \
           --platform linux/386,linux/amd64,linux/arm/v6,linux/arm/v7,linux/arm64 \
-          --output=type=registry,push=true \
+          --output=type=registry \
           --tag ekofr/pihole-exporter:${{ steps.get_version.outputs.TAG_NAME }} \
           .
 
@@ -99,18 +99,17 @@ jobs:
             extension: '.exe'
     runs-on: ${{ matrix.os }}
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v2
-      - uses: actions/setup-go@v3
+      - uses: actions/setup-go@v2
         with:
-          go-version: '1.20'
+          go-version: 1.15
 
       - name: Download go dependencies
         run: go get -t -v ./...
 
-      # Release File
       - name: Create release
         run: GOOS=${{ matrix.goos }} GOARCH=${{ matrix.goarch }} go build -ldflags "-s -w" -o pihole_exporter-${{ matrix.goos }}-${{ matrix.goarch }}${{ matrix.extension }} ./
-   
+
       - name: Upload release assets
         id: upload-release-asset
         uses: actions/upload-release-asset@v1
@@ -121,18 +120,3 @@ jobs:
           asset_path: ./pihole_exporter-${{ matrix.goos }}-${{ matrix.goarch }}${{ matrix.extension }}
           asset_name: pihole_exporter-${{ matrix.goos }}-${{ matrix.goarch }}${{ matrix.extension }}
           asset_content_type: application/octet-stream
-      
-      # SHA256 Sum File
-      - name: Create SHA256 sum
-        run: sha256sum pihole_exporter-${{ matrix.goos }}-${{ matrix.goarch }}${{ matrix.extension }} > pihole_exporter-${{ matrix.goos }}-${{ matrix.goarch }}${{ matrix.extension }}.sha256.txt
-        
-      - name: Upload release assets
-        id: upload-release-sum-asset
-        uses: actions/upload-release-asset@v1
-        env:
-          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
-        with:
-          upload_url: ${{ needs.release.outputs.upload_url }}${{ matrix.extension }}.sha256.txt
-          asset_path: ./pihole_exporter-${{ matrix.goos }}-${{ matrix.goarch }}${{ matrix.extension }}.sha256.txt
-          asset_name: pihole_exporter-${{ matrix.goos }}-${{ matrix.goarch }}${{ matrix.extension }}.sha256.txt
-          asset_content_type: application/octet-stream

.gitignore

@@ -1,7 +1,6 @@
 vendor
 bin
 tmp
-
 .vscode
 report.xml
 debug

.pre-commit-config.yaml

@@ -1,18 +0,0 @@
-repos:
-- repo: https://github.com/dnephin/pre-commit-golang
-  rev: v0.5.1
-  hooks:
-    - id: go-fmt
-    - id: go-vet
-    - id: validate-toml
-    - id: no-go-testing
-    - id: go-unit-tests
-    - id: go-build
-    - id: go-mod-tidy
-- repo: https://github.com/pre-commit/pre-commit-hooks.git
-  rev: v4.3.0
-  hooks:
-    - id: end-of-file-fixer
-    - id: trailing-whitespace
-    - id: mixed-line-ending
-    - id: check-merge-conflict

Dockerfile

@@ -2,7 +2,7 @@ ARG IMAGE=scratch
 ARG OS=linux
 ARG ARCH=amd64
 
-FROM golang:1.21.2-alpine3.17 as builder
+FROM golang:1.15-alpine3.12 as builder
 
 WORKDIR /go/src/github.com/eko/pihole-exporter
 COPY . .

README.md

@@ -1,17 +1,14 @@
-# Pi-hole Prometheus Exporter
+# PI-Hole Prometheus Exporter
 
 ![Build/Push (master)](https://github.com/eko/pihole-exporter/workflows/Build/Push%20(master)/badge.svg)
 [![GoDoc](https://godoc.org/github.com/eko/pihole-exporter?status.png)](https://godoc.org/github.com/eko/pihole-exporter)
 [![GoReportCard](https://goreportcard.com/badge/github.com/eko/pihole-exporter)](https://goreportcard.com/report/github.com/eko/pihole-exporter)
 
-This is a Prometheus exporter for [Pi-hole](https://pi-hole.net/)'s Raspberry PI ad blocker.
+This is a Prometheus exporter for [PI-Hole](https://pi-hole.net/)'s Raspberry PI ad blocker.
 
 ![Grafana dashboard](https://raw.githubusercontent.com/eko/pihole-exporter/master/dashboard.jpg)
 
-Available Grafana Dasboards:
+Grafana dashboard is [available here](https://grafana.com/dashboards/10176) on the Grafana dashboard website and also [here](https://raw.githubusercontent.com/eko/pihole-exporter/master/grafana/dashboard.json) on the GitHub repository.
-
-* Prometheus: [Grafana Labs](https://grafana.com/grafana/dashboards/10176-pi-hole-exporter/) / [JSON/Github](https://raw.githubusercontent.com/eko/pihole-exporter/master/grafana/dashboard.json) --> [Preview](https://raw.githubusercontent.com/eko/pihole-exporter/master/dashboard.jpg)
-* InfluxDB 2 (Flux): [Grafana Labs](https://grafana.com/grafana/dashboards/17094-pi-hole-exporter-influxdb-2/) / [JSON/Github](https://raw.githubusercontent.com/eko/pihole-exporter/master/grafana/dashboard-influxdb2.json) --> [Preview](https://raw.githubusercontent.com/eko/pihole-exporter/master/dashboard-influxdb2.png)
 
 ## Prerequisites
 
@@ -46,6 +43,7 @@ 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
@@ -58,8 +56,8 @@ $ 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' \
-  -p 9617:9617 \
   ekofr/pihole-exporter:latest
 ```
 
@@ -71,44 +69,18 @@ $ 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 \
   ekofr/pihole-exporter:latest
 ```
 
-A single instance of pihole-exporter can monitor multiple pi-holes instances.
-To do so, you can specify a list of hostnames, protocols, passwords/API tokens and ports by separating them with commas in their respective environment variable:
-
-```
-$ docker run \
-  -e 'PIHOLE_PROTOCOL=http,http,http" \
-  -e 'PIHOLE_HOSTNAME=192.168.1.2,192.168.1.3,192.168.1.4"' \
-  -e "PIHOLE_API_TOKEN=$API_TOKEN1,$API_TOKEN2,$API_TOKEN3" \
-  -e "PIHOLE_PORT=8080,8081,8080" \
-  -e 'PORT=9617' \
-  -p 9617:9617 \
-  ekofr/pihole-exporter:latest
-```
-
-If port, protocol and API token/password is the same for all instances, you can specify them only once:
-
-```
-$ docker run \
-  -e 'PIHOLE_PROTOCOL=http" \
-  -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 'PORT=9617' \
-  -p 9617:9617 \
-  ekofr/pihole-exporter:latest
-```
-
 ### From sources
 
 Optionally, you can download and build it from the sources. You have to retrieve the project sources by using one of the following way:
 ```bash
-$ go install github.com/eko/pihole-exporter@latest
+$ go get -u github.com/eko/pihole-exporter
 # or
 $ git clone https://github.com/eko/pihole-exporter.git
 ```
@@ -143,12 +115,12 @@ $ ./pihole_exporter -pihole_hostname 192.168.1.10 -pihole_api_token $API_TOKEN
 
 ```bash
 2019/05/09 20:19:52 ------------------------------------
-2019/05/09 20:19:52 -  Pi-hole exporter configuration  -
+2019/05/09 20:19:52 -  PI-Hole exporter configuration  -
 2019/05/09 20:19:52 ------------------------------------
 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 Timeout : 5s
+2019/05/09 20:19:52 Interval : 10s
 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
@@ -183,21 +155,19 @@ scrape_configs:
 
 ## Available CLI options
 ```bash
-# Hostname of the host(s) where Pi-hole is installed
+# 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
   -pihole_hostname string (optional) (default "127.0.0.1")
 
-# Password defined on the Pi-hole interface
+# 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`
+# WEBPASSWORD / api token defined on the PI-Hole interface at `/etc/pihole/setupVars.conf`
   -pihole_api_token string (optional)
 
-# Address to be used for the exporter
-  -bind_addr string (optional) (default "0.0.0.0")
-
 # Port to be used for the exporter
   -port string (optional) (default "9617")
 ```
@@ -217,12 +187,12 @@ scrape_configs:
 | pihole_unique_clients        | This represent the number of unique clients seen                                          |
 | pihole_dns_queries_all_types | This represent the number of DNS queries made for all types                               |
 | pihole_reply                 | This represent the number of replies made for all types                                   |
-| pihole_top_queries           | This represent the number of top queries made by Pi-hole by domain                        |
+| pihole_top_queries           | This represent the number of top queries made by PI-Hole by domain                        |
-| pihole_top_ads               | This represent the number of top ads made by Pi-hole by domain                            |
+| pihole_top_ads               | This represent the number of top ads made by PI-Hole by domain                            |
-| pihole_top_sources           | This represent the number of top sources requests made by Pi-hole by source host          |
+| pihole_top_sources           | This represent the number of top sources requests made by PI-Hole by source host          |
-| pihole_forward_destinations  | This represent the number of forward destinations requests made by Pi-hole by destination |
+| pihole_forward_destinations  | This represent the number of forward destinations requests made by PI-Hole by destination |
-| pihole_querytypes            | This represent the number of queries made by Pi-hole by type                              |
+| pihole_querytypes            | This represent the number of queries made by PI-Hole by type                              |
-| pihole_status                | This represent if Pi-hole is enabled                                                      |
+| pihole_status                | This represent if PI-Hole is enabled                                                      |
 
 
 ## Pihole-Exporter Helm Chart

config/configuration.go

@@ -2,15 +2,11 @@ package config
 
 import (
 	"context"
-	"errors"
 	"fmt"
+	"log"
 	"reflect"
-	"runtime"
-	"strings"
 	"time"
 
-	log "github.com/sirupsen/logrus"
-
 	"github.com/heetch/confita"
 	"github.com/heetch/confita/backend"
 	"github.com/heetch/confita/backend/env"
@@ -19,41 +15,29 @@ import (
 
 // Config is the exporter CLI configuration.
 type Config struct {
-	PIHoleProtocol string `config:"pihole_protocol"`
+	PIHoleProtocol string        `config:"pihole_protocol"`
-	PIHoleHostname string `config:"pihole_hostname"`
+	PIHoleHostname string        `config:"pihole_hostname"`
-	PIHolePort     uint16 `config:"pihole_port"`
+	PIHolePort     uint16        `config:"pihole_port"`
-	PIHolePassword string `config:"pihole_password"`
+	PIHolePassword string        `config:"pihole_password"`
-	PIHoleApiToken string `config:"pihole_api_token"`
+	PIHoleApiToken string        `config:"pihole_api_token"`
-	BindAddr       string `config:"bind_addr"`
+	Port           string        `config:"port"`
-	Port           uint16 `config:"port"`
+	Interval       time.Duration `config:"interval"`
 }
 
-type EnvConfig struct {
+func getDefaultConfig() *Config {
-	PIHoleProtocol []string      `config:"pihole_protocol"`
+	return &Config{
-	PIHoleHostname []string      `config:"pihole_hostname"`
+		PIHoleProtocol: "http",
-	PIHolePort     []uint16      `config:"pihole_port"`
+		PIHoleHostname: "127.0.0.1",
-	PIHolePassword []string      `config:"pihole_password"`
+		PIHolePort:     80,
-	PIHoleApiToken []string      `config:"pihole_api_token"`
+		PIHolePassword: "",
-	BindAddr       string        `config:"bind_addr"`
+		PIHoleApiToken: "",
-	Port           uint16        `config:"port"`
+		Port:           "9617",
-	Timeout        time.Duration `config:"timeout"`
+		Interval:       10 * time.Second,
-}
-
-func getDefaultEnvConfig() *EnvConfig {
-	return &EnvConfig{
-		PIHoleProtocol: []string{"http"},
-		PIHoleHostname: []string{"127.0.0.1"},
-		PIHolePort:     []uint16{80},
-		PIHolePassword: []string{},
-		PIHoleApiToken: []string{},
-		BindAddr:       "0.0.0.0",
-		Port:           9617,
-		Timeout:        5 * time.Second,
 	}
 }
 
 // Load method loads the configuration by using both flag or environment variables.
-func Load() (*EnvConfig, []Config, error) {
+func Load() *Config {
 	loaders := []backend.Backend{
 		env.NewBackend(),
 		flags.NewBackend(),
@@ -61,7 +45,7 @@ func Load() (*EnvConfig, []Config, error) {
 
 	loader := confita.NewLoader(loaders...)
 
-	cfg := getDefaultEnvConfig()
+	cfg := getDefaultConfig()
 	err := loader.Load(context.Background(), cfg)
 	if err != nil {
 		panic(err)
@@ -69,150 +53,30 @@ func Load() (*EnvConfig, []Config, error) {
 
 	cfg.show()
 
-	if clientsConfig, err := cfg.Split(); err != nil {
+	return cfg
-		return cfg, nil, err
-	} else {
-		return cfg, clientsConfig, nil
-	}
 }
 
-func (c *Config) String() string {
+func (c Config) show() {
-	ref := reflect.ValueOf(c)
-	fields := ref.Elem()
-
-	buffer := make([]string, fields.NumField(), fields.NumField())
-	for i := 0; i < fields.NumField(); i++ {
-		valueField := fields.Field(i)
-		typeField := fields.Type().Field(i)
-		if typeField.Name != "PIHolePassword" && typeField.Name != "PIHoleApiToken" {
-			buffer[i] = fmt.Sprintf("%s=%v", typeField.Name, valueField.Interface())
-		} else if valueField.Len() > 0 {
-			buffer[i] = fmt.Sprintf("%s=%s", typeField.Name, "*****")
-		}
-	}
-
-	buffer = removeEmptyString(buffer)
-	return fmt.Sprintf("<Config@%X %s>", &c, strings.Join(buffer, ", "))
-}
-
-// 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 EnvConfig) Split() ([]Config, error) {
-	hostsCount := len(c.PIHoleHostname)
-	result := make([]Config, 0, hostsCount)
-
-	for i, hostname := range c.PIHoleHostname {
-		config := Config{
-			PIHoleHostname: strings.TrimSpace(hostname),
-		}
-
-		if len(c.PIHolePort) == 1 {
-			config.PIHolePort = c.PIHolePort[0]
-		} else if len(c.PIHolePort) == hostsCount {
-			config.PIHolePort = c.PIHolePort[i]
-		} else if len(c.PIHolePort) != 0 {
-			return nil, errors.New("Wrong number of ports. Port can be empty to use default, one value to use for all hosts, or match the number of hosts")
-		}
-
-		if hasData, data, isValid := extractStringConfig(c.PIHoleProtocol, i, hostsCount); hasData {
-			config.PIHoleProtocol = data
-		} else if !isValid {
-			return nil, errors.New("Wrong number of PIHoleProtocol. PIHoleProtocol can be empty to use default, one value to use for all hosts, or match the number of hosts")
-		}
-
-		if hasData, data, isValid := extractStringConfig(c.PIHoleApiToken, i, hostsCount); hasData {
-			config.PIHoleApiToken = data
-		} else if !isValid {
-			return nil, errors.New(fmt.Sprintf("Wrong number of PIHoleApiToken %d (Hosts: %d). PIHoleApiToken can be empty to use default, one value to use for all hosts, or match the number of hosts", len(c.PIHoleApiToken), hostsCount))
-		}
-
-		if hasData, data, isValid := extractStringConfig(c.PIHolePassword, i, hostsCount); hasData {
-			config.PIHolePassword = data
-		} else if !isValid {
-			return nil, errors.New("Wrong number of PIHolePassword. PIHolePassword can be empty to use default, one value to use for all hosts, or match the number of hosts")
-		}
-
-		result = append(result, config)
-	}
-
-	return result, nil
-}
-
-func extractStringConfig(data []string, idx int, hostsCount int) (bool, string, bool) {
-	if len(data) == 1 {
-		v := strings.TrimSpace(data[0])
-		if v != "" {
-			return true, v, true
-		}
-	} else if len(data) == hostsCount {
-		v := strings.TrimSpace(data[idx])
-		if v != "" {
-			return true, v, true
-		}
-	} else if len(data) != 0 { //Host count missmatch
-		return false, "", false
-	}
-
-	// Empty
-	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 {
-		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 EnvConfig) show() {
 	val := reflect.ValueOf(&c).Elem()
-	log.Info("------------------------------------")
+	log.Println("------------------------------------")
-	log.Info("-  Pi-hole exporter configuration  -")
+	log.Println("-  PI-Hole exporter configuration  -")
-	log.Info("------------------------------------")
+	log.Println("------------------------------------")
-	log.Info("Go version: ", runtime.Version())
 	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.Info(fmt.Sprintf("%s : %v", typeField.Name, valueField.Interface()))
+			log.Println(fmt.Sprintf("%s : %v", typeField.Name, valueField.Interface()))
 		} else {
-			showAuthenticationMethod(typeField.Name, valueField.Len())
+			showAuthenticationMethod(typeField.Name, valueField.String())
 		}
 	}
-	log.Info("------------------------------------")
+	log.Println("------------------------------------")
 }
 
-func showAuthenticationMethod(name string, length int) {
+func showAuthenticationMethod(name, value string) {
-	if length > 0 {
+	if len(value) > 0 {
-		log.Info(fmt.Sprintf("Pi-hole Authentication Method : %s", name))
+		log.Println(fmt.Sprintf("Pi-Hole Authentication Method : %s", name))
 	}
 }

config/configuration_test.go

@@ -1,154 +0,0 @@
-package config
-
-import (
-	"fmt"
-	"testing"
-
-	"github.com/stretchr/testify/assert"
-)
-
-const (
-	PIHOLE_HOSTNAME  = "PIHOLE_HOSTNAME"
-	PIHOLE_PORT      = "PIHOLE_PORT"
-	PIHOLE_API_TOKEN = "PIHOLE_API_TOKEN"
-	PIHOLE_PROTOCOL  = "PIHOLE_PROTOCOL"
-)
-
-type EnvInitiazlier func(*testing.T)
-
-type TestCase struct {
-	Name        string
-	Initializer EnvInitiazlier
-}
-
-func TestSplitDefault(t *testing.T) {
-	assert := assert.New(t)
-
-	env := getDefaultEnvConfig()
-
-	clientConfigs, err := env.Split()
-	assert.NoError(err)
-
-	clientConfig := clientConfigs[0]
-	assert.Equal("127.0.0.1", clientConfig.PIHoleHostname)
-	assert.Equal("http", clientConfig.PIHoleProtocol)
-	assert.Equal(uint16(80), clientConfig.PIHolePort)
-	assert.Empty(clientConfig.PIHoleApiToken)
-	assert.Empty(clientConfig.PIHolePassword)
-}
-
-func TestSplitMultipleHostWithSameConfig(t *testing.T) {
-	assert := assert.New(t)
-
-	env := getDefaultEnvConfig()
-	env.PIHoleHostname = []string{"127.0.0.1", "127.0.0.2", "127.0.0.3"}
-	env.PIHoleApiToken = []string{"api-token"}
-	env.PIHolePort = []uint16{8080}
-
-	clientConfigs, err := env.Split()
-	assert.NoError(err)
-	assert.Len(clientConfigs, 3)
-
-	testCases := []struct {
-		Host     string
-		Port     uint16
-		Protocol string
-	}{
-		{
-			Host:     "127.0.0.1",
-			Port:     8080,
-			Protocol: "http",
-		},
-		{
-			Host:     "127.0.0.2",
-			Port:     8080,
-			Protocol: "http",
-		},
-		{
-			Host:     "127.0.0.3",
-			Port:     8080,
-			Protocol: "http",
-		},
-	}
-
-	for i, tc := range testCases {
-		t.Run(fmt.Sprintf("Test %s", tc.Host), func(t *testing.T) {
-			clientConfig := clientConfigs[i]
-
-			assert.Equal(tc.Host, clientConfig.PIHoleHostname)
-			assert.Equal(tc.Protocol, clientConfig.PIHoleProtocol)
-			assert.Equal(tc.Port, clientConfig.PIHolePort)
-			assert.Equal("api-token", clientConfig.PIHoleApiToken)
-			assert.Empty(clientConfig.PIHolePassword)
-		})
-	}
-}
-
-func TestSplitMultipleHostWithMultipleConfigs(t *testing.T) {
-	assert := assert.New(t)
-
-	env := getDefaultEnvConfig()
-	env.PIHoleHostname = []string{"127.0.0.1", "127.0.0.2", "127.0.0.3"}
-	env.PIHoleApiToken = []string{"api-token1", "", "api-token3"}
-	env.PIHolePassword = []string{"", "password2", ""}
-	env.PIHolePort = []uint16{8081, 8082, 8083}
-
-	clientConfigs, err := env.Split()
-	assert.NoError(err)
-	assert.Len(clientConfigs, 3)
-
-	testCases := []struct {
-		Host     string
-		Port     uint16
-		Protocol string
-		ApiToken string
-		Password string
-	}{
-		{
-			Host:     "127.0.0.1",
-			Port:     8081,
-			Protocol: "http",
-			ApiToken: "api-token1",
-			Password: "",
-		},
-		{
-			Host:     "127.0.0.2",
-			Port:     8082,
-			Protocol: "http",
-			ApiToken: "",
-			Password: "password2",
-		},
-		{
-			Host:     "127.0.0.3",
-			Port:     8083,
-			Protocol: "http",
-			ApiToken: "api-token3",
-			Password: "",
-		},
-	}
-
-	for i, tc := range testCases {
-		t.Run(fmt.Sprintf("Test %s", tc.Host), func(t *testing.T) {
-			clientConfig := clientConfigs[i]
-
-			assert.Equal(tc.Host, clientConfig.PIHoleHostname)
-			assert.Equal(tc.Protocol, clientConfig.PIHoleProtocol)
-			assert.Equal(tc.Port, clientConfig.PIHolePort)
-			assert.Equal(tc.ApiToken, clientConfig.PIHoleApiToken)
-			assert.Equal(tc.Password, clientConfig.PIHolePassword)
-		})
-	}
-}
-
-func TestWrongParams(t *testing.T) {
-	assert := assert.New(t)
-
-	env := getDefaultEnvConfig()
-	env.PIHoleHostname = []string{"127.0.0.1", "127.0.0.2", "127.0.0.3"}
-	env.PIHoleApiToken = []string{"api-token1", "api-token2"}
-	env.PIHolePort = []uint16{808}
-
-	clientConfigs, err := env.Split()
-	assert.Errorf(err, "Wrong number of PIHoleApiToken. PIHoleApiToken can be empty to use default, one value to use for all hosts, or match the number of hosts")
-	assert.Nil(clientConfigs)
-}

docker-compose.yml

@@ -1,19 +0,0 @@
-version: "3.6"
-services:
-  pihole_exporter:
-    build:
-      context: ./
-      args:
-        ARCH: CHANGE_ME
-      dockerfile: Dockerfile
-    image: ekofr/pihole-exporter:arm64
-    container_name: pihole_exporter
-    expose:
-      - 9617
-    environment:
-      PIHOLE_HOSTNAME: CHANGE_ME 
-      PIHOLE_PORT: CHANGE_ME
-      PIHOLE_PASSWORD: CHANGE_ME
-      INTERVAL: 30s
-      PORT: 9617
-    restart: always

go.mod

@@ -1,28 +1,9 @@
 module github.com/eko/pihole-exporter
 
-go 1.20
+go 1.15
 
 require (
-	github.com/heetch/confita v0.10.0
+	github.com/heetch/confita v0.9.2
-	github.com/prometheus/client_golang v1.17.0
+	github.com/prometheus/client_golang v1.9.0
-	github.com/sirupsen/logrus v1.9.3
+	golang.org/x/net v0.0.0-20200625001655-4c5254603344
-	github.com/stretchr/testify v1.8.4
-	github.com/xonvanetta/shutdown v0.0.3
-	golang.org/x/net v0.16.0
-)
-
-require (
-	github.com/beorn7/perks v1.0.1 // indirect
-	github.com/cespare/xxhash/v2 v2.2.0 // indirect
-	github.com/davecgh/go-spew v1.1.1 // indirect
-	github.com/golang/protobuf v1.5.3 // indirect
-	github.com/matttproud/golang_protobuf_extensions v1.0.4 // indirect
-	github.com/pkg/errors v0.9.1 // indirect
-	github.com/pmezard/go-difflib v1.0.0 // indirect
-	github.com/prometheus/client_model v0.4.1-0.20230718164431-9a2bf3000d16 // indirect
-	github.com/prometheus/common v0.44.0 // indirect
-	github.com/prometheus/procfs v0.11.1 // indirect
-	golang.org/x/sys v0.13.0 // indirect
-	google.golang.org/protobuf v1.31.0 // indirect
-	gopkg.in/yaml.v3 v3.0.1 // indirect
 )

go.sum

@@ -1,61 +1,133 @@
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@@ -76,6 +148,7 @@ github.com/hashicorp/go-syslog v1.0.0/go.mod h1:qPfqrKkXGihmCqbJM2mZgkZGvKG1dFdv
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@@ -88,23 +161,41 @@ github.com/hashicorp/vault/api v1.0.4/go.mod h1:gDcqh3WGcR1cpF5AJz/B1UFheUEneMoI
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 google.golang.org/grpc v1.14.0/go.mod h1:yo6s7OP7yaDglbqo1J04qKzAhqBH6lvTonzMVmEdcZw=
+google.golang.org/grpc v1.17.0/go.mod h1:6QZJwpn2B+Zp71q/5VxRsJ6NXXVCE5NRUHRo+f3cWCs=
 google.golang.org/grpc v1.19.0/go.mod h1:mqu4LbDTu4XGKhr4mRzUsmM4RtVoemTSY81AxZiDr8c=
+google.golang.org/grpc v1.20.0/go.mod h1:chYK+tFQF0nDUGJgXMSgLCQk3phJEuONr2DCgLDdAQM=
+google.golang.org/grpc v1.20.1/go.mod h1:10oTOabMzJvdu6/UiuZezV6QK5dSlG84ov/aaiqXj38=
+google.golang.org/grpc v1.21.0/go.mod h1:oYelfM1adQP15Ek0mdvEgi9Df8B9CZIaU1084ijfRaM=
 google.golang.org/grpc v1.22.0/go.mod h1:Y5yQAOtifL1yxbo5wqy6BxZv8vAUGQwXBOALyacEbxg=
-google.golang.org/protobuf v1.26.0-rc.1/go.mod h1:jlhhOSvTdKEhbULTjvd4ARK9grFBp09yW+WbY/TyQbw=
+google.golang.org/grpc v1.22.1/go.mod h1:Y5yQAOtifL1yxbo5wqy6BxZv8vAUGQwXBOALyacEbxg=
-google.golang.org/protobuf v1.26.0/go.mod h1:9q0QmTI4eRPtz6boOQmLYwt+qCgq0jsYwAQnmE0givc=
+google.golang.org/grpc v1.23.0/go.mod h1:Y5yQAOtifL1yxbo5wqy6BxZv8vAUGQwXBOALyacEbxg=
-google.golang.org/protobuf v1.31.0 h1:g0LDEJHgrBl9N9r17Ru3sqWhkIx2NB67okBHPwC7hs8=
+google.golang.org/grpc v1.23.1/go.mod h1:Y5yQAOtifL1yxbo5wqy6BxZv8vAUGQwXBOALyacEbxg=
-google.golang.org/protobuf v1.31.0/go.mod h1:HV8QOd/L58Z+nl8r43ehVNZIU/HEI6OcFqwMG9pJV4I=
+google.golang.org/grpc v1.26.0/go.mod h1:qbnxyOmOxrQa7FizSgH+ReBfzJrCY1pSN7KXBS8abTk=
+google.golang.org/protobuf v0.0.0-20200109180630-ec00e32a8dfd/go.mod h1:DFci5gLYBciE7Vtevhsrf46CRTquxDuWsQurQQe4oz8=
+google.golang.org/protobuf v0.0.0-20200221191635-4d8936d0db64/go.mod h1:kwYJMbMJ01Woi6D6+Kah6886xMZcty6N08ah7+eCXa0=
+google.golang.org/protobuf v0.0.0-20200228230310-ab0ca4ff8a60/go.mod h1:cfTl7dwQJ+fmap5saPgwCLgHXTUD7jkjRqWcaiX5VyM=
+google.golang.org/protobuf v1.20.1-0.20200309200217-e05f789c0967/go.mod h1:A+miEFZTKqfCUM6K7xSMQL9OKL/b6hQv+e19PK+JZNE=
+google.golang.org/protobuf v1.21.0/go.mod h1:47Nbq4nVaFHyn7ilMalzfO3qCViNmqZ2kzikPIcrTAo=
+google.golang.org/protobuf v1.23.0 h1:4MY060fB1DLGMB/7MBTLnwQUY6+F09GEiz6SsrNqyzM=
+google.golang.org/protobuf v1.23.0/go.mod h1:EGpADcykh3NcUnDUJcl1+ZksZNG86OlYog2l/sGQquU=
 gopkg.in/alecthomas/kingpin.v2 v2.2.6/go.mod h1:FMv+mEhP44yOT+4EoQTLFTRgOQ1FBLkstjWtayDeSgw=
 gopkg.in/asn1-ber.v1 v1.0.0-20181015200546-f715ec2f112d/go.mod h1:cuepJuh7vyXfUyUwEgHQXw849cJrilpS5NeIjOWESAw=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
+gopkg.in/check.v1 v1.0.0-20180628173108-788fd7840127 h1:qIbj1fsPNlZgppZ+VLlY7N33q108Sa+fhmuc+sWQYwY=
 gopkg.in/check.v1 v1.0.0-20180628173108-788fd7840127/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
-gopkg.in/check.v1 v1.0.0-20201130134442-10cb98267c6c h1:Hei/4ADfdWqJk1ZMxUNpqntNwaWcugrBjAiHlqqRiVk=
+gopkg.in/check.v1 v1.0.0-20190902080502-41f04d3bba15 h1:YR8cESwS4TdDjEe65xsg0ogRM/Nc3DYOhEAlW+xobZo=
+gopkg.in/check.v1 v1.0.0-20190902080502-41f04d3bba15/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
+gopkg.in/cheggaaa/pb.v1 v1.0.25/go.mod h1:V/YB90LKu/1FcN3WVnfiiE5oMCibMjukxqG/qStrOgw=
+gopkg.in/errgo.v2 v2.1.0/go.mod h1:hNsd1EY+bozCKY1Ytp96fpM3vjJbqLJn88ws8XvfDNI=
+gopkg.in/fsnotify.v1 v1.4.7/go.mod h1:Tz8NjZHkW78fSQdbUxIjBTcgA1z1m8ZHf0WmKUhAMys=
+gopkg.in/gcfg.v1 v1.2.3/go.mod h1:yesOnuUOFQAhST5vPY4nbZsb/huCgGGXlipJsBn0b3o=
 gopkg.in/resty.v1 v1.12.0/go.mod h1:mDo4pnntr5jdWRML875a/NmxYqAlA73dVijT2AXvQQo=
 gopkg.in/square/go-jose.v2 v2.3.1/go.mod h1:M9dMgbHiYLoDGQrXy7OpJDJWiKiU//h+vD76mk0e1AI=
+gopkg.in/tomb.v1 v1.0.0-20141024135613-dd632973f1e7/go.mod h1:dt/ZhP58zS4L8KSrWDmTeBkI65Dw0HsyUHuEVlX15mw=
+gopkg.in/warnings.v0 v0.1.2/go.mod h1:jksf8JmL6Qr/oQM2OXTHunEvvTAsrWBLb6OOjuVWRNI=
 gopkg.in/yaml.v2 v2.0.0-20170812160011-eb3733d160e7/go.mod h1:JAlM8MvJe8wmxCU4Bli9HhUf9+ttbYbLASfIpnQbh74=
 gopkg.in/yaml.v2 v2.2.1/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
+gopkg.in/yaml.v2 v2.2.2 h1:ZCJp+EgiOT7lHqUV2J862kp8Qj64Jo6az82+3Td9dZw=
 gopkg.in/yaml.v2 v2.2.2/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
-gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
+gopkg.in/yaml.v2 v2.2.4/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
-gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA=
+gopkg.in/yaml.v2 v2.2.5/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
-gopkg.in/yaml.v3 v3.0.1/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
+gopkg.in/yaml.v2 v2.3.0 h1:clyUAQHOM3G0M3f5vQj7LuJrETvjVot3Z5el9nffUtU=
+gopkg.in/yaml.v2 v2.3.0/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
+honnef.co/go/tools v0.0.0-20180728063816-88497007e858/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
 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=
+honnef.co/go/tools v0.0.1-2019.2.3/go.mod h1:a3bituU0lyd329TUQxRnasdCoJDkEUEAqEt0JzvZhAg=
+sigs.k8s.io/yaml v1.1.0/go.mod h1:UJmg0vDUVViEyp3mgSv9WPwZCDxu4rQW1olrI1uml+o=
+sourcegraph.com/sourcegraph/appdash v0.0.0-20190731080439-ebfcffb1b5c0/go.mod h1:hI742Nqp5OhwiqlzhgfbWU4mW4yO10fP+LoT9WOswdU=

grafana/dashboard.json

@@ -1,3 +1,4 @@
+{
 {
   "__inputs": [
     {
@@ -67,7 +68,7 @@
       }
     ]
   },
-  "description": "This is a Pi-hole dashboard when using the https://github.com/eko/pihole-exporter Prometheus exporter",
+  "description": "This is a PI-Hole dashboard when using the https://github.com/eko/pihole-exporter Prometheus exporter",
   "editable": true,
   "gnetId": 10176,
   "graphTooltip": 0,
@@ -86,7 +87,7 @@
       },
       "id": 60,
       "panels": [],
-      "title": "🥧🕳️ Pi-hole",
+      "title": "🍓PI-Hole",
       "type": "row"
     },
     {
@@ -100,7 +101,7 @@
         "rgba(237, 129, 40, 0.89)",
         "#299c46"
       ],
-      "datasource": "${DS_PROMETHEUS}",
+      "datasource": "Prometheus",
       "fieldConfig": {
         "defaults": {
           "custom": {}
@@ -196,7 +197,7 @@
         "rgba(237, 129, 40, 0.89)",
         "#d44a3a"
       ],
-      "datasource": "${DS_PROMETHEUS}",
+      "datasource": "Prometheus",
       "decimals": null,
       "fieldConfig": {
         "defaults": {
@@ -287,7 +288,7 @@
         "rgba(237, 129, 40, 0.89)",
         "#d44a3a"
       ],
-      "datasource": "${DS_PROMETHEUS}",
+      "datasource": "Prometheus",
       "fieldConfig": {
         "defaults": {
           "custom": {}
@@ -375,7 +376,7 @@
         "label": "Others",
         "threshold": 0
       },
-      "datasource": "${DS_PROMETHEUS}",
+      "datasource": "Prometheus",
       "fieldConfig": {
         "defaults": {
           "custom": {}
@@ -427,7 +428,7 @@
         "label": "Others",
         "threshold": 0
       },
-      "datasource": "${DS_PROMETHEUS}",
+      "datasource": "Prometheus",
       "fieldConfig": {
         "defaults": {
           "custom": {}
@@ -479,7 +480,7 @@
         "label": "Others",
         "threshold": 0
       },
-      "datasource": "${DS_PROMETHEUS}",
+      "datasource": "Prometheus",
       "fieldConfig": {
         "defaults": {
           "custom": {}
@@ -528,7 +529,7 @@
       "bars": false,
       "dashLength": 10,
       "dashes": false,
-      "datasource": "${DS_PROMETHEUS}",
+      "datasource": "Prometheus",
       "fieldConfig": {
         "defaults": {
           "custom": {
@@ -639,7 +640,7 @@
     },
     {
       "cacheTimeout": null,
-      "datasource": "${DS_PROMETHEUS}",
+      "datasource": "Prometheus",
       "fieldConfig": {
         "defaults": {
           "color": {
@@ -717,7 +718,7 @@
       "bars": false,
       "dashLength": 10,
       "dashes": false,
-      "datasource": "${DS_PROMETHEUS}",
+      "datasource": "Prometheus",
       "fieldConfig": {
         "defaults": {
           "custom": {}
@@ -816,7 +817,7 @@
       "bars": false,
       "dashLength": 10,
       "dashes": false,
-      "datasource": "${DS_PROMETHEUS}",
+      "datasource": "Prometheus",
       "fieldConfig": {
         "defaults": {
           "custom": {}
@@ -919,7 +920,7 @@
       "bars": false,
       "dashLength": 10,
       "dashes": false,
-      "datasource": "${DS_PROMETHEUS}",
+      "datasource": "Prometheus",
       "fieldConfig": {
         "defaults": {
           "custom": {}
@@ -1018,7 +1019,7 @@
       "bars": false,
       "dashLength": 10,
       "dashes": false,
-      "datasource": "${DS_PROMETHEUS}",
+      "datasource": "Prometheus",
       "fieldConfig": {
         "defaults": {
           "custom": {}
@@ -1112,7 +1113,7 @@
     },
     {
       "columns": [],
-      "datasource": "${DS_PROMETHEUS}",
+      "datasource": "Prometheus",
       "fieldConfig": {
         "defaults": {
           "custom": {}
@@ -1174,7 +1175,7 @@
     },
     {
       "columns": [],
-      "datasource": "${DS_PROMETHEUS}",
+      "datasource": "Prometheus",
       "fieldConfig": {
         "defaults": {
           "custom": {}
@@ -1242,7 +1243,7 @@
       "bars": false,
       "dashLength": 10,
       "dashes": false,
-      "datasource": "${DS_PROMETHEUS}",
+      "datasource": "Prometheus",
       "fieldConfig": {
         "defaults": {
           "custom": {}
@@ -1346,7 +1347,7 @@
       "bars": false,
       "dashLength": 10,
       "dashes": false,
-      "datasource": "${DS_PROMETHEUS}",
+      "datasource": "Prometheus",
       "fieldConfig": {
         "defaults": {
           "custom": {
@@ -1469,7 +1470,7 @@
           "text": "10.10.200.20",
           "value": "10.10.200.20"
         },
-        "datasource": "${DS_PROMETHEUS}",
+        "datasource": "Prometheus",
         "definition": "label_values(pihole_ads_blocked_today, hostname)",
         "hide": 0,
         "includeAll": false,
@@ -1522,7 +1523,7 @@
     ]
   },
   "timezone": "",
-  "title": "Pi-hole Exporter",
+  "title": "PI-Hole Exporter",
-  "uid": "Pi-hole-Exporter",
+  "uid": "PI-Hole-Exporter",
   "version": 31
 }

internal/metrics/metrics.go

@@ -1,12 +1,13 @@
 package metrics
 
 import (
+	"log"
+
 	"github.com/prometheus/client_golang/prometheus"
-	log "github.com/sirupsen/logrus"
 )
 
 var (
-	// DomainsBlocked - The number of domains being blocked by Pi-hole.
+	// DomainsBlocked - The number of domains being blocked by PI-Hole.
 	DomainsBlocked = prometheus.NewGaugeVec(
 		prometheus.GaugeOpts{
 			Name:      "domains_being_blocked",
@@ -16,7 +17,7 @@ var (
 		[]string{"hostname"},
 	)
 
-	// DNSQueriesToday - The number of DNS requests made over Pi-hole over the current day.
+	// DNSQueriesToday - The number of DNS requests made over PI-Hole over the current day.
 	DNSQueriesToday = prometheus.NewGaugeVec(
 		prometheus.GaugeOpts{
 			Name:      "dns_queries_today",
@@ -26,7 +27,7 @@ var (
 		[]string{"hostname"},
 	)
 
-	// AdsBlockedToday - The number of ads blocked by Pi-hole over the current day.
+	// AdsBlockedToday - The number of ads blocked by PI-Hole over the current day.
 	AdsBlockedToday = prometheus.NewGaugeVec(
 		prometheus.GaugeOpts{
 			Name:      "ads_blocked_today",
@@ -36,7 +37,7 @@ var (
 		[]string{"hostname"},
 	)
 
-	// AdsPercentageToday - The percentage of ads blocked by Pi-hole over the current day.
+	// AdsPercentageToday - The percentage of ads blocked by PI-Hole over the current day.
 	AdsPercentageToday = prometheus.NewGaugeVec(
 		prometheus.GaugeOpts{
 			Name:      "ads_percentage_today",
@@ -46,7 +47,7 @@ var (
 		[]string{"hostname"},
 	)
 
-	// UniqueDomains - The number of unique domains seen by Pi-hole.
+	// UniqueDomains - The number of unique domains seen by PI-Hole.
 	UniqueDomains = prometheus.NewGaugeVec(
 		prometheus.GaugeOpts{
 			Name:      "unique_domains",
@@ -56,7 +57,7 @@ var (
 		[]string{"hostname"},
 	)
 
-	// QueriesForwarded - The number of queries forwarded by Pi-hole.
+	// QueriesForwarded - The number of queries forwarded by PI-Hole.
 	QueriesForwarded = prometheus.NewGaugeVec(
 		prometheus.GaugeOpts{
 			Name:      "queries_forwarded",
@@ -66,7 +67,7 @@ var (
 		[]string{"hostname"},
 	)
 
-	// QueriesCached - The number of queries cached by Pi-hole.
+	// QueriesCached - The number of queries cached by PI-Hole.
 	QueriesCached = prometheus.NewGaugeVec(
 		prometheus.GaugeOpts{
 			Name:      "queries_cached",
@@ -76,7 +77,7 @@ var (
 		[]string{"hostname"},
 	)
 
-	// ClientsEverSeen - The number of clients ever seen by Pi-hole.
+	// ClientsEverSeen - The number of clients ever seen by PI-Hole.
 	ClientsEverSeen = prometheus.NewGaugeVec(
 		prometheus.GaugeOpts{
 			Name:      "clients_ever_seen",
@@ -86,7 +87,7 @@ var (
 		[]string{"hostname"},
 	)
 
-	// UniqueClients - The number of unique clients seen by Pi-hole.
+	// UniqueClients - The number of unique clients seen by PI-Hole.
 	UniqueClients = prometheus.NewGaugeVec(
 		prometheus.GaugeOpts{
 			Name:      "unique_clients",
@@ -96,7 +97,7 @@ var (
 		[]string{"hostname"},
 	)
 
-	// DNSQueriesAllTypes - The number of DNS queries made for all types by Pi-hole.
+	// DNSQueriesAllTypes - The number of DNS queries made for all types by PI-Hole.
 	DNSQueriesAllTypes = prometheus.NewGaugeVec(
 		prometheus.GaugeOpts{
 			Name:      "dns_queries_all_types",
@@ -106,7 +107,7 @@ var (
 		[]string{"hostname"},
 	)
 
-	// Reply - The number of replies made for every types by Pi-hole.
+	// Reply - The number of replies made for every types by PI-Hole.
 	Reply = prometheus.NewGaugeVec(
 		prometheus.GaugeOpts{
 			Name:      "reply",
@@ -116,68 +117,68 @@ var (
 		[]string{"hostname", "type"},
 	)
 
-	// TopQueries - The number of top queries made by Pi-hole by domain.
+	// TopQueries - The number of top queries made by PI-Hole by domain.
 	TopQueries = prometheus.NewGaugeVec(
 		prometheus.GaugeOpts{
 			Name:      "top_queries",
 			Namespace: "pihole",
-			Help:      "This represent the number of top queries made by Pi-hole by domain",
+			Help:      "This represent the number of top queries made by PI-Hole by domain",
 		},
 		[]string{"hostname", "domain"},
 	)
 
-	// TopAds - The number of top ads made by Pi-hole by domain.
+	// TopAds - The number of top ads made by PI-Hole by domain.
 	TopAds = prometheus.NewGaugeVec(
 		prometheus.GaugeOpts{
 			Name:      "top_ads",
 			Namespace: "pihole",
-			Help:      "This represent the number of top ads made by Pi-hole by domain",
+			Help:      "This represent the number of top ads made by PI-Hole by domain",
 		},
 		[]string{"hostname", "domain"},
 	)
 
-	// TopSources - The number of top sources requests made by Pi-hole by source host.
+	// TopSources - The number of top sources requests made by PI-Hole by source host.
 	TopSources = prometheus.NewGaugeVec(
 		prometheus.GaugeOpts{
 			Name:      "top_sources",
 			Namespace: "pihole",
-			Help:      "This represent the number of top sources requests made by Pi-hole by source host",
+			Help:      "This represent the number of top sources requests made by PI-Hole by source host",
 		},
 		[]string{"hostname", "source"},
 	)
 
-	// ForwardDestinations - The number of forward destinations requests made by Pi-hole by destination.
+	// ForwardDestinations - The number of forward destinations requests made by PI-Hole by destination.
 	ForwardDestinations = prometheus.NewGaugeVec(
 		prometheus.GaugeOpts{
 			Name:      "forward_destinations",
 			Namespace: "pihole",
-			Help:      "This represent the number of forward destinations requests made by Pi-hole by destination",
+			Help:      "This represent the number of forward destinations requests made by PI-Hole by destination",
 		},
 		[]string{"hostname", "destination"},
 	)
 
-	// QueryTypes - The number of queries made by Pi-hole by type.
+	// QueryTypes - The number of queries made by PI-Hole by type.
 	QueryTypes = prometheus.NewGaugeVec(
 		prometheus.GaugeOpts{
 			Name:      "querytypes",
 			Namespace: "pihole",
-			Help:      "This represent the number of queries made by Pi-hole by type",
+			Help:      "This represent the number of queries made by PI-Hole by type",
 		},
 		[]string{"hostname", "type"},
 	)
 
-	// Status - Is Pi-hole enabled?
+	// Status - Is PI-Hole enabled?
 	Status = prometheus.NewGaugeVec(
 		prometheus.GaugeOpts{
 			Name:      "status",
 			Namespace: "pihole",
-			Help:      "This if Pi-hole is enabled",
+			Help:      "This if PI-Hole is enabled",
 		},
 		[]string{"hostname"},
 	)
 )
 
-// Init initializes all Prometheus metrics made available by Pi-hole exporter.
+// Init initializes all Prometheus metrics made available by PI-Hole exporter.
 func Init() {
 	initMetric("domains_blocked", DomainsBlocked)
 	initMetric("dns_queries_today", DNSQueriesToday)
@@ -200,5 +201,5 @@ func Init() {
 
 func initMetric(name string, metric *prometheus.GaugeVec) {
 	prometheus.MustRegister(metric)
-	log.Info("New Prometheus metric registered: ", name)
+	log.Printf("New Prometheus metric registered: %s", name)
 }

internal/pihole/client.go

@@ -4,6 +4,7 @@ import (
 	"encoding/json"
 	"fmt"
 	"io/ioutil"
+	"log"
 	"net/http"
 	"net/url"
 	"os"
@@ -11,161 +12,109 @@ import (
 	"strings"
 	"time"
 
-	log "github.com/sirupsen/logrus"
-
-	"github.com/eko/pihole-exporter/config"
 	"github.com/eko/pihole-exporter/internal/metrics"
 )
 
-type ClientStatus byte
+var (
-
+	loginURLPattern = "%s://%s:%d/admin/index.php?login"
-const (
+	statsURLPattern = "%s://%s:%d/admin/api.php?summaryRaw&overTimeData&topItems&recentItems&getQueryTypes&getForwardDestinations&getQuerySources&jsonForceObject"
-	MetricsCollectionInProgress ClientStatus = iota
-	MetricsCollectionSuccess
-	MetricsCollectionError
-	MetricsCollectionTimeout
 )
 
-func (status ClientStatus) String() string {
+// Client struct is a PI-Hole client to request an instance of a PI-Hole ad blocker.
-	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
+	protocol   string
-	Status     chan *ClientChannel
+	hostname   string
+	port       uint16
+	password   string
+	sessionID  string
+	apiToken   string
 }
 
-// NewClient method initializes a new Pi-hole client.
+// NewClient method initializes a new PI-Hole client.
-func NewClient(config *config.Config, envConfig *config.EnvConfig) *Client {
+func NewClient(protocol, hostname string, port uint16, password, apiToken string, interval time.Duration) *Client {
-	err := config.Validate()
+	if protocol != "http" && protocol != "https" {
-	if err != nil {
+		log.Printf("protocol %s is invalid. Must be http or https.", protocol)
-		log.Error(err)
 		os.Exit(1)
 	}
 
-	log.Printf("Creating client with config %s\n", config)
-
 	return &Client{
-		config: config,
+		protocol: protocol,
+		hostname: hostname,
+		port:     port,
+		password: password,
+		apiToken: apiToken,
+		interval: interval,
 		httpClient: http.Client{
 			CheckRedirect: func(req *http.Request, via []*http.Request) error {
 				return http.ErrUseLastResponse
 			},
-			Timeout: envConfig.Timeout,
 		},
-		Status: make(chan *ClientChannel, 1),
 	}
 }
 
-func (c *Client) String() string {
+// Scrape method authenticates and retrieves statistics from PI-Hole JSON API
-	return c.config.PIHoleHostname
+// and then pass them as Prometheus metrics.
-}
+func (c *Client) Scrape() {
+	for range time.Tick(c.interval) {
+		stats := c.getStatistics()
 
-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)
-		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 {
+		log.Printf("New tick of statistics: %s", stats.ToString())
-	stats, err := c.getStatistics()
-	if err != nil {
-		return err
 	}
-	c.setMetrics(stats)
-	log.Printf("New tick of statistics from %s: %s", c.config.PIHoleHostname, stats)
-	return nil
-}
-
-func (c *Client) GetHostname() string {
-	return c.config.PIHoleHostname
 }
 
 func (c *Client) setMetrics(stats *Stats) {
-	metrics.DomainsBlocked.WithLabelValues(c.config.PIHoleHostname).Set(float64(stats.DomainsBeingBlocked))
+	metrics.DomainsBlocked.WithLabelValues(c.hostname).Set(float64(stats.DomainsBeingBlocked))
-	metrics.DNSQueriesToday.WithLabelValues(c.config.PIHoleHostname).Set(float64(stats.DNSQueriesToday))
+	metrics.DNSQueriesToday.WithLabelValues(c.hostname).Set(float64(stats.DNSQueriesToday))
-	metrics.AdsBlockedToday.WithLabelValues(c.config.PIHoleHostname).Set(float64(stats.AdsBlockedToday))
+	metrics.AdsBlockedToday.WithLabelValues(c.hostname).Set(float64(stats.AdsBlockedToday))
-	metrics.AdsPercentageToday.WithLabelValues(c.config.PIHoleHostname).Set(float64(stats.AdsPercentageToday))
+	metrics.AdsPercentageToday.WithLabelValues(c.hostname).Set(float64(stats.AdsPercentageToday))
-	metrics.UniqueDomains.WithLabelValues(c.config.PIHoleHostname).Set(float64(stats.UniqueDomains))
+	metrics.UniqueDomains.WithLabelValues(c.hostname).Set(float64(stats.UniqueDomains))
-	metrics.QueriesForwarded.WithLabelValues(c.config.PIHoleHostname).Set(float64(stats.QueriesForwarded))
+	metrics.QueriesForwarded.WithLabelValues(c.hostname).Set(float64(stats.QueriesForwarded))
-	metrics.QueriesCached.WithLabelValues(c.config.PIHoleHostname).Set(float64(stats.QueriesCached))
+	metrics.QueriesCached.WithLabelValues(c.hostname).Set(float64(stats.QueriesCached))
-	metrics.ClientsEverSeen.WithLabelValues(c.config.PIHoleHostname).Set(float64(stats.ClientsEverSeen))
+	metrics.ClientsEverSeen.WithLabelValues(c.hostname).Set(float64(stats.ClientsEverSeen))
-	metrics.UniqueClients.WithLabelValues(c.config.PIHoleHostname).Set(float64(stats.UniqueClients))
+	metrics.UniqueClients.WithLabelValues(c.hostname).Set(float64(stats.UniqueClients))
-	metrics.DNSQueriesAllTypes.WithLabelValues(c.config.PIHoleHostname).Set(float64(stats.DNSQueriesAllTypes))
+	metrics.DNSQueriesAllTypes.WithLabelValues(c.hostname).Set(float64(stats.DNSQueriesAllTypes))
 
-	metrics.Reply.WithLabelValues(c.config.PIHoleHostname, "unknown").Set(float64(stats.ReplyUnknown))
+	metrics.Reply.WithLabelValues(c.hostname, "no_data").Set(float64(stats.ReplyNoData))
-	metrics.Reply.WithLabelValues(c.config.PIHoleHostname, "no_data").Set(float64(stats.ReplyNoData))
+	metrics.Reply.WithLabelValues(c.hostname, "nx_domain").Set(float64(stats.ReplyNxDomain))
-	metrics.Reply.WithLabelValues(c.config.PIHoleHostname, "nx_domain").Set(float64(stats.ReplyNxDomain))
+	metrics.Reply.WithLabelValues(c.hostname, "cname").Set(float64(stats.ReplyCname))
-	metrics.Reply.WithLabelValues(c.config.PIHoleHostname, "cname").Set(float64(stats.ReplyCname))
+	metrics.Reply.WithLabelValues(c.hostname, "ip").Set(float64(stats.ReplyIP))
-	metrics.Reply.WithLabelValues(c.config.PIHoleHostname, "ip").Set(float64(stats.ReplyIP))
-	metrics.Reply.WithLabelValues(c.config.PIHoleHostname, "domain").Set(float64(stats.ReplyDomain))
-	metrics.Reply.WithLabelValues(c.config.PIHoleHostname, "rr_name").Set(float64(stats.ReplyRRName))
-	metrics.Reply.WithLabelValues(c.config.PIHoleHostname, "serv_fail").Set(float64(stats.ReplyServFail))
-	metrics.Reply.WithLabelValues(c.config.PIHoleHostname, "refused").Set(float64(stats.ReplyRefused))
-	metrics.Reply.WithLabelValues(c.config.PIHoleHostname, "not_imp").Set(float64(stats.ReplyNotImp))
-	metrics.Reply.WithLabelValues(c.config.PIHoleHostname, "other").Set(float64(stats.ReplyOther))
-	metrics.Reply.WithLabelValues(c.config.PIHoleHostname, "dnssec").Set(float64(stats.ReplyDNSSEC))
-	metrics.Reply.WithLabelValues(c.config.PIHoleHostname, "none").Set(float64(stats.ReplyNone))
-	metrics.Reply.WithLabelValues(c.config.PIHoleHostname, "blob").Set(float64(stats.ReplyBlob))
 
 	var isEnabled int = 0
 	if stats.Status == enabledStatus {
 		isEnabled = 1
 	}
-	metrics.Status.WithLabelValues(c.config.PIHoleHostname).Set(float64(isEnabled))
+	metrics.Status.WithLabelValues(c.hostname).Set(float64(isEnabled))
-
-	// Pi-hole returns a subset of stats when Auth is missing or incorrect.
-	// This provides a warning to users that metrics are not complete.
-	if len(stats.TopQueries) == 0 {
-		log.Warnf("Invalid Authentication - Some metrics may be missing. Please confirm your Pi-hole API token / Password for %s", c.config.PIHoleHostname)
-	}
 
 	for domain, value := range stats.TopQueries {
-		metrics.TopQueries.WithLabelValues(c.config.PIHoleHostname, domain).Set(float64(value))
+		metrics.TopQueries.WithLabelValues(c.hostname, domain).Set(float64(value))
 	}
 
 	for domain, value := range stats.TopAds {
-		metrics.TopAds.WithLabelValues(c.config.PIHoleHostname, domain).Set(float64(value))
+		metrics.TopAds.WithLabelValues(c.hostname, domain).Set(float64(value))
 	}
 
 	for source, value := range stats.TopSources {
-		metrics.TopSources.WithLabelValues(c.config.PIHoleHostname, source).Set(float64(value))
+		metrics.TopSources.WithLabelValues(c.hostname, source).Set(float64(value))
 	}
 
 	for destination, value := range stats.ForwardDestinations {
-		metrics.ForwardDestinations.WithLabelValues(c.config.PIHoleHostname, destination).Set(value)
+		metrics.ForwardDestinations.WithLabelValues(c.hostname, destination).Set(value)
 	}
 
 	for queryType, value := range stats.QueryTypes {
-		metrics.QueryTypes.WithLabelValues(c.config.PIHoleHostname, queryType).Set(value)
+		metrics.QueryTypes.WithLabelValues(c.hostname, queryType).Set(value)
 	}
 }
 
 func (c *Client) getPHPSessionID() (sessionID string) {
-	values := url.Values{"pw": []string{c.config.PIHolePassword}}
+	loginURL := fmt.Sprintf(loginURLPattern, c.protocol, c.hostname, c.port)
+	values := url.Values{"pw": []string{c.password}}
 
-	req, err := http.NewRequest("POST", c.config.PIHoleLoginURL(), strings.NewReader(values.Encode()))
+	req, err := http.NewRequest("POST", loginURL, strings.NewReader(values.Encode()))
 	if err != nil {
 		log.Fatal("An error has occured when creating HTTP statistics request", err)
 	}
@@ -175,7 +124,7 @@ func (c *Client) getPHPSessionID() (sessionID string) {
 
 	resp, err := c.httpClient.Do(req)
 	if err != nil {
-		log.Errorf("An error has occured during login to Pi-hole: %v", err)
+		log.Printf("An error has occured during login to PI-Hole: %v", err)
 	}
 
 	for _, cookie := range resp.Cookies() {
@@ -188,18 +137,18 @@ func (c *Client) getPHPSessionID() (sessionID string) {
 	return
 }
 
-func (c *Client) getStatistics() (*Stats, error) {
+func (c *Client) getStatistics() *Stats {
-	stats := new(Stats)
+	var stats Stats
 
-	statsURL := c.config.PIHoleStatsURL()
+	statsURL := fmt.Sprintf(statsURLPattern, c.protocol, c.hostname, c.port)
 
 	if c.isUsingApiToken() {
-		statsURL = fmt.Sprintf("%s&auth=%s", statsURL, c.config.PIHoleApiToken)
+		statsURL = fmt.Sprintf("%s&auth=%s", statsURL, c.apiToken)
 	}
 
 	req, err := http.NewRequest("GET", statsURL, nil)
 	if err != nil {
-		return nil, fmt.Errorf("an error has occured when creating HTTP statistics request: %w", err)
+		log.Fatal("An error has occured when creating HTTP statistics request", err)
 	}
 
 	if c.isUsingPassword() {
@@ -208,29 +157,28 @@ func (c *Client) getStatistics() (*Stats, error) {
 
 	resp, err := c.httpClient.Do(req)
 	if err != nil {
-		return nil, fmt.Errorf("an error has occured during retrieving Pi-hole statistics: %w", err)
+		log.Println("An error has occured during retrieving PI-Hole statistics", err)
 	}
 
-	defer resp.Body.Close()
 	body, err := ioutil.ReadAll(resp.Body)
 	if err != nil {
-		return nil, fmt.Errorf("unable to read Pi-hole statistics HTTP response: %w", err)
+		log.Println("Unable to read PI-Hole statistics HTTP response", err)
 	}
 
-	err = json.Unmarshal(body, stats)
+	err = json.Unmarshal(body, &stats)
 	if err != nil {
-		return nil, fmt.Errorf("unable to unmarshal Pi-hole statistics to statistics struct model: %w", err)
+		log.Println("Unable to unmarshal PI-Hole statistics to statistics struct model", err)
 	}
 
-	return stats, nil
+	return &stats
 }
 
 func (c *Client) isUsingPassword() bool {
-	return len(c.config.PIHolePassword) > 0
+	return len(c.password) > 0
 }
 
 func (c *Client) isUsingApiToken() bool {
-	return len(c.config.PIHoleApiToken) > 0
+	return len(c.apiToken) > 0
 }
 
 func (c *Client) authenticateRequest(req *http.Request) {

internal/pihole/model.go

@@ -6,7 +6,7 @@ const (
 	enabledStatus = "enabled"
 )
 
-// Stats struct is the Pi-hole statistics JSON API corresponding model.
+// Stats struct is the PI-Hole statistics JSON API corresponding model.
 type Stats struct {
 	DomainsBeingBlocked int                `json:"domains_being_blocked"`
 	DNSQueriesToday     int                `json:"dns_queries_today"`
@@ -18,20 +18,10 @@ type Stats struct {
 	ClientsEverSeen     int                `json:"clients_ever_seen"`
 	UniqueClients       int                `json:"unique_clients"`
 	DNSQueriesAllTypes  int                `json:"dns_queries_all_types"`
-	ReplyUnknown        int                `json:"reply_UNKNOWN"`
 	ReplyNoData         int                `json:"reply_NODATA"`
 	ReplyNxDomain       int                `json:"reply_NXDOMAIN"`
 	ReplyCname          int                `json:"reply_CNAME"`
 	ReplyIP             int                `json:"reply_IP"`
-	ReplyDomain         int                `json:"reply_DOMAIN"`
-	ReplyRRName         int                `json:"reply_RRNAME"`
-	ReplyServFail       int                `json:"reply_SERVFAIL"`
-	ReplyRefused        int                `json:"reply_REFUSED"`
-	ReplyNotImp         int                `json:"reply_NOTIMP"`
-	ReplyOther          int                `json:"reply_OTHER"`
-	ReplyDNSSEC         int                `json:"reply_DNSSEC"`
-	ReplyNone           int                `json:"reply_NONE"`
-	ReplyBlob           int                `json:"reply_BLOB"`
 	TopQueries          map[string]int     `json:"top_queries"`
 	TopAds              map[string]int     `json:"top_ads"`
 	TopSources          map[string]int     `json:"top_sources"`
@@ -41,6 +31,6 @@ type Stats struct {
 }
 
 // ToString method returns a string of the current statistics struct.
-func (s *Stats) String() string {
+func (s *Stats) ToString() string {
 	return fmt.Sprintf("%d ads blocked / %d total DNS queries", s.AdsBlockedToday, s.DNSQueriesAllTypes)
 }

internal/server/server.go

@@ -1,15 +1,11 @@
 package server
 
 import (
-	"fmt"
+	"log"
 	"net/http"
-	"strconv"
-	"strings"
 	"time"
 
-	"github.com/eko/pihole-exporter/internal/pihole"
 	"github.com/prometheus/client_golang/prometheus/promhttp"
-	log "github.com/sirupsen/logrus"
 	"golang.org/x/net/context"
 )
 
@@ -20,34 +16,15 @@ 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(addr string, port uint16, clients []*pihole.Client) *Server {
+func NewServer(port string) *Server {
 	mux := http.NewServeMux()
-	httpServer := &http.Server{
+	httpServer := &http.Server{Addr: ":" + port, Handler: mux}
-		Addr:    addr + ":" + strconv.Itoa(int(port)),
-		Handler: mux,
-	}
 
 	s := &Server{
 		httpServer: httpServer,
 	}
 
-	mux.HandleFunc("/metrics", func(writer http.ResponseWriter, request *http.Request) {
+	mux.Handle("/metrics", promhttp.Handler())
-		log.Printf("request.Header: %v\n", request.Header)
-
-		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())
-			}
-		}
-
-		promhttp.Handler().ServeHTTP(writer, request)
-	})
-
 	mux.Handle("/readiness", s.readinessHandler())
 	mux.Handle("/liveness", s.livenessHandler())
 
@@ -72,41 +49,20 @@ 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) {
+	return http.HandlerFunc(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 func(w http.ResponseWriter, req *http.Request) {
+	return http.HandlerFunc(func(w http.ResponseWriter, req *http.Request) {
 		w.WriteHeader(http.StatusOK)
-	}
+	})
 }
 
 func (s *Server) isReady() bool {

main.go

@@ -1,55 +1,53 @@
 package main
 
 import (
-	"log"
+	"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"
-	"github.com/xonvanetta/shutdown/pkg/shutdown"
+)
+
+const (
+	name = "pihole-exporter"
+)
+
+var (
+	s *server.Server
 )
 
 func main() {
-	envConf, clientConfigs, err := config.Load()
+	conf := config.Load()
-	if err != nil {
-		log.Fatal(err.Error())
-	}
 
 	metrics.Init()
 
-	serverDead := make(chan struct{})
+	initPiHoleClient(conf.PIHoleProtocol, conf.PIHoleHostname, conf.PIHolePort, conf.PIHolePassword, conf.PIHoleApiToken, conf.Interval)
+	initHttpServer(conf.Port)
 
-	clients := buildClients(clientConfigs, envConf)
+	handleExitSignal()
-
-	s := server.NewServer(envConf.BindAddr, envConf.Port, clients)
-	go func() {
-		s.ListenAndServe()
-		close(serverDead)
-	}()
-
-	ctx := shutdown.Context()
-
-	go func() {
-		<-ctx.Done()
-		s.Stop()
-	}()
-
-	select {
-	case <-ctx.Done():
-	case <-serverDead:
-	}
-
-	log.Println("pihole-exporter HTTP server stopped")
 }
 
-func buildClients(clientConfigs []config.Config, envConfig *config.EnvConfig) []*pihole.Client {
+func initPiHoleClient(protocol, hostname string, port uint16, password, apiToken string, interval time.Duration) {
-	clients := make([]*pihole.Client, 0, len(clientConfigs))
+	client := pihole.NewClient(protocol, hostname, port, password, apiToken, interval)
-	for i := range clientConfigs {
+	go client.Scrape()
-		clientConfig := &clientConfigs[i]
+}
-
+
-		client := pihole.NewClient(clientConfig, envConfig)
+func initHttpServer(port string) {
-		clients = append(clients, client)
+	s = server.NewServer(port)
-	}
+	go s.ListenAndServe()
-	return clients
+}
+
+func handleExitSignal() {
+	stop := make(chan os.Signal, 1)
+	signal.Notify(stop, os.Interrupt, syscall.SIGTERM)
+
+	<-stop
+
+	s.Stop()
+	fmt.Println(fmt.Sprintf("\n%s HTTP server stopped", name))
 }