merge: update-example-systemd-file

* Merge branch 'update-example-systemd-file' into 'main'
* See merge request hectorjsmith/fail2ban-prometheus-exporter!115
* Merged by: Hector <hector@hjs.dev>

.gitignore

@@ -4,3 +4,5 @@ vendor/
 
 build/
 dist/
+
+fail2ban_exporter

.gitlab-ci.yml

@@ -1,54 +1,64 @@
-image: golang:latest
-
-before_script:
-  - make go/dependencies
-
 stages:
   - test
   - build
+  - release
 
-dependencies:
+.go_template:
+  image: golang:latest
+
+sast:
   stage: test
-  script:
-    - make go/checkDependencies
+
+include:
+- template: Security/SAST.gitlab-ci.yml
+- template: Security/Dependency-Scanning.gitlab-ci.yml
 
 format:
+  extends: .go_template
   stage: test
   script:
-    - make go/checkFmt
+    - make check/fmt
+
+vet:
+  extends: .go_template
+  stage: test
+  allow_failure: true
+  script:
+    - make vet
 
 test:
+  extends: .go_template
   stage: test
   script:
-    - make go/test
+    - make test
 
 build:
+  extends: .go_template
   stage: build
-  only:
-    - main
-    - tags
   script:
-    - git fetch --tags
-    - make build/snapshot
+    - make build
   artifacts:
     paths:
-      - dist/*.tar.gz
-      - dist/checksums.txt
+      - fail2ban_exporter
     expire_in: 1 day
 
-docker/gitlab:
-  stage: build
-  only:
-    - main
-    - tags
+release:
+  stage: release
   image: docker:stable
   services:
     - docker:dind
-  before_script:
-    - apk add git
-    - apk add make
-    - docker login -u $CI_REGISTRY_USER -p $CI_REGISTRY_PASSWORD $CI_REGISTRY
-  script:
-    - make docker/build/latest
-    - make docker/build/tag
-    - docker push registry.gitlab.com/hectorjsmith/fail2ban-prometheus-exporter
+  variables:
+    DOCKER_REGISTRY: $CI_REGISTRY
+    DOCKER_USERNAME: $CI_REGISTRY_USER
+    DOCKER_PASSWORD: $CI_REGISTRY_PASSWORD
+    GIT_DEPTH: 0
+  rules:
+    - if: $CI_COMMIT_TAG =~ /^v.*$/
+  script: |
+    docker run --rm --privileged \
+      -v $PWD:/go/src/gitlab.com/hectorjsmith/fail2ban-prometheus-exporter \
+      -w /go/src/gitlab.com/hectorjsmith/fail2ban-prometheus-exporter \
+      -v /var/run/docker.sock:/var/run/docker.sock \
+      -e DOCKER_USERNAME -e DOCKER_PASSWORD -e DOCKER_REGISTRY  \
+      -e GITLAB_TOKEN \
+      goreleaser/goreleaser release --clean

.goreleaser.yml

@@ -1,11 +1,7 @@
-# This is an example goreleaser.yaml file with some sane defaults.
-# Make sure to check the documentation at http://goreleaser.com
-before:
-  hooks:
-    - make go/dependencies
+project_name: fail2ban_exporter
 builds:
-  -
-    dir: src
+  - env: [CGO_ENABLED=0]
+    binary: fail2ban_exporter
     goos:
       - linux
       - darwin
@@ -18,13 +14,84 @@ builds:
       - "6"
       - "7"
 
-archives:
-  -
-    files:
-    - LICENSE
-    - README.md
-    - CHANGELOG.md
-checksum:
-  name_template: 'checksums.txt'
+dockers:
+- image_templates:
+  - "registry.gitlab.com/hectorjsmith/fail2ban-prometheus-exporter:{{ .Major }}-amd64"
+  - "registry.gitlab.com/hectorjsmith/fail2ban-prometheus-exporter:{{ .Major }}.{{ .Minor }}-amd64"
+  - 'registry.gitlab.com/hectorjsmith/fail2ban-prometheus-exporter:{{ .Version }}-amd64'
+  - "registry.gitlab.com/hectorjsmith/fail2ban-prometheus-exporter:latest-amd64"
+  extra_files:
+  - health
+  use: buildx
+  dockerfile: Dockerfile.goreleaser
+  build_flag_templates:
+  - "--pull"
+  - "--platform=linux/amd64"
+  - --label=org.opencontainers.image.title={{ .ProjectName }}
+  - --label=org.opencontainers.image.description={{ .ProjectName }}
+  - --label=org.opencontainers.image.url=https://gitlab.com/hectorjsmith/fail2ban-prometheus-exporter
+  - --label=org.opencontainers.image.source=https://gitlab.com/hectorjsmith/fail2ban-prometheus-exporter
+  - --label=org.opencontainers.image.version={{ .Version }}
+  - --label=org.opencontainers.image.created={{ time "2006-01-02T15:04:05Z07:00" }}
+  - --label=org.opencontainers.image.revision={{ .FullCommit }}
+  - --label=org.opencontainers.image.licenses=MIT
+- image_templates:
+  - "registry.gitlab.com/hectorjsmith/fail2ban-prometheus-exporter:{{ .Major }}-arm64"
+  - "registry.gitlab.com/hectorjsmith/fail2ban-prometheus-exporter:{{ .Major }}.{{ .Minor }}-arm64"
+  - 'registry.gitlab.com/hectorjsmith/fail2ban-prometheus-exporter:{{ .Version }}-arm64'
+  - "registry.gitlab.com/hectorjsmith/fail2ban-prometheus-exporter:latest-arm64"
+  extra_files:
+  - health
+  use: buildx
+  dockerfile: Dockerfile.goreleaser
+  build_flag_templates:
+  - "--pull"
+  - "--platform=linux/arm64"
+  - --label=org.opencontainers.image.title={{ .ProjectName }}
+  - --label=org.opencontainers.image.description={{ .ProjectName }}
+  - --label=org.opencontainers.image.url=https://gitlab.com/hectorjsmith/fail2ban-prometheus-exporter
+  - --label=org.opencontainers.image.source=https://gitlab.com/hectorjsmith/fail2ban-prometheus-exporter
+  - --label=org.opencontainers.image.version={{ .Version }}
+  - --label=org.opencontainers.image.created={{ time "2006-01-02T15:04:05Z07:00" }}
+  - --label=org.opencontainers.image.revision={{ .FullCommit }}
+  - --label=org.opencontainers.image.licenses=MIT
+  goarch: arm64
+
+docker_manifests:
+- name_template: 'registry.gitlab.com/hectorjsmith/fail2ban-prometheus-exporter:{{ .Major }}'
+  image_templates:
+  - 'registry.gitlab.com/hectorjsmith/fail2ban-prometheus-exporter:{{ .Major }}-amd64'
+  - 'registry.gitlab.com/hectorjsmith/fail2ban-prometheus-exporter:{{ .Major }}-arm64'
+
+- name_template: 'registry.gitlab.com/hectorjsmith/fail2ban-prometheus-exporter:{{ .Major }}.{{ .Minor }}'
+  image_templates:
+  - 'registry.gitlab.com/hectorjsmith/fail2ban-prometheus-exporter:{{ .Major }}.{{ .Minor }}-amd64'
+  - 'registry.gitlab.com/hectorjsmith/fail2ban-prometheus-exporter:{{ .Major }}.{{ .Minor }}-arm64'
+
+- name_template: 'registry.gitlab.com/hectorjsmith/fail2ban-prometheus-exporter:{{ .Version }}'
+  image_templates:
+  - 'registry.gitlab.com/hectorjsmith/fail2ban-prometheus-exporter:{{ .Version }}-amd64'
+  - 'registry.gitlab.com/hectorjsmith/fail2ban-prometheus-exporter:{{ .Version }}-arm64'
+
+- name_template: 'registry.gitlab.com/hectorjsmith/fail2ban-prometheus-exporter:latest'
+  image_templates:
+  - 'registry.gitlab.com/hectorjsmith/fail2ban-prometheus-exporter:latest-amd64'
+  - 'registry.gitlab.com/hectorjsmith/fail2ban-prometheus-exporter:latest-arm64'
+
 changelog:
-  skip: true
+  groups:
+    - title: "⛔ Breaking Changes"
+      regexp: '^.*?!:.+$'
+      order: 0
+    - title: "🎉 Features"
+      regexp: '^.*?feat(\(\w+\))??:.+$'
+      order: 1
+    - title: "🐛 Fixes"
+      regexp: '^.*?fix(\(\w+\))??:.+$'
+      order: 2
+    - title: "📑 Other"
+      order: 999
+  filters:
+    exclude:
+      - "^Merge"
+      - "^merge"

CHANGELOG.md

@@ -1,72 +0,0 @@
-# CHANGELOG
-
-All notable changes to this project will be documented in this file.
-
-The format is based on [Keep a Changelog], and this project adheres to [Semantic Versioning].
-
-## [Unreleased]
-*Nothing yet*
-
-## [0.4.0] - 2021-10-18
-*Add new fail2ban config metrics*
-
-### Added
-- (56730c8) feat: add new jail config metrics
-- (5a107cc) feat: support for textfile metrics ([#13](https://gitlab.com/hectorjsmith/fail2ban-prometheus-exporter/issues/13))
-
-### Removed
-- (b268f86) remove: database-based metrics
-- (0b6a941) remove: windows builds
-
-## [0.3.0] - 2021-09-27
-*Export new version metrics ([#12](https://gitlab.com/hectorjsmith/fail2ban-prometheus-exporter/issues/12))*
-
-### Added
-- (3c9a005) feat: render basic html page at root url
-- (22a165d) feat: improve startup logging
-- (fba9ee2) feat: export new version metric ([#12](https://gitlab.com/hectorjsmith/fail2ban-prometheus-exporter/issues/12))
-
-## [0.2.0] - 2021-08-31
-*Collect metrics through fail2ban socket - based on [#11](https://gitlab.com/hectorjsmith/fail2ban-prometheus-exporter/issues/11)*
-
-### Added
-- (39133d0) feat: collect new up metric from fail2ban socket
-- (4da46f3) feat: export metrics with socket errors
-- (bd841c3) feat: set up metric to 0 if errors found
-- (1964dde) feat: export metrics for failed/banned counts
-- (2ab1f7d) feat: support reading fail2ban socket in docker
-- (1282d63) feat: new metric for enabled jails ([#1](https://gitlab.com/hectorjsmith/fail2ban-prometheus-exporter/issues/1))
-
-### Fixed
-- (526b1c7) fix: update banned metrics to exclude expired bans ([#11](https://gitlab.com/hectorjsmith/fail2ban-prometheus-exporter/issues/11))
-
-### Deprecated
-- Use of the fail2ban database has been deprecated. The exporter now collects metrics through the fail2ban socket file. See [#11](https://gitlab.com/hectorjsmith/fail2ban-prometheus-exporter/-/issues/11) for more details.
-
-## [0.1.0] - 2021-03-28
-*Initial release*
-
-### Added
-- (6355c9e) feat: fail on startup if database file does not exist ([#8](https://gitlab.com/hectorjsmith/fail2ban-prometheus-exporter/issues/8))
-- (4f18bf3) feat: add cli parameters for db path and metrics port ([#4](https://gitlab.com/hectorjsmith/fail2ban-prometheus-exporter/issues/4))
-- (91cba80) feat: export number of banned ips
-- (4b96501) feat: export bad ip count per jail
-- (0b40e5d) feat: connect to fail2ban db and extract total bad ips
-- (7ced846) feat: initial setup of metric exporter
-
-
-### Fixed
-- (0842419) fix: compile tool without cgo_enabled flag
-
-## 0.0.0 - 2021-02-05
-*Repository creation*
-
----
-
-[Keep a Changelog]: https://keepachangelog.com/en/1.0.0/
-[Semantic Versioning]: https://semver.org/spec/v2.0.0.html
-[Unreleased]: https://gitlab.com/hectorjsmith/fail2ban-prometheus-exporter/compare/0.1.0...main
-[0.1.0]: https://gitlab.com/hectorjsmith/fail2ban-prometheus-exporter/compare/0.0.0...0.1.0
-[0.2.0]: https://gitlab.com/hectorjsmith/fail2ban-prometheus-exporter/compare/0.1.0...0.2.0
-[0.3.0]: https://gitlab.com/hectorjsmith/fail2ban-prometheus-exporter/compare/0.2.0...0.3.0
-[0.4.0]: https://gitlab.com/hectorjsmith/fail2ban-prometheus-exporter/compare/0.3.0...0.4.0

Dockerfile

@@ -1,26 +1,30 @@
-# Using golang:latest instead of alpine because of issues with sqlite3
-FROM golang:latest AS build
+FROM golang:1.20-buster AS build
 
-# Create build folder to compile tool
-WORKDIR /build
+# Create build workspace folder
+WORKDIR /workspace
+ADD . /workspace
 
-# Copy source files to build folder and link to the /go folder
-COPY . /build
-RUN ln -s /go/src/ /build/src
+# Install updates and build tools
+RUN apt update --yes && \
+    apt install --yes build-essential
 
-# Compile the tool using a Make command
-RUN make build/docker
+# Build the actual binary
+RUN make build
 
+# -- -- -- -- -- --
 
-FROM debian:buster-slim
+# Set up image to run the tool
+FROM alpine
 
 # Create main app folder to run from
 WORKDIR /app
 
-# Copy compiled binary to release image
-COPY --from=build /build/src/exporter /app/fail2ban-prometheus-exporter
+# Copy built binary from build image
+COPY --from=build /workspace/fail2ban_exporter /app
 
-# Copy init script into main app folder and set as entry point
-COPY docker/run.sh /app/
-RUN chmod +x /app/*
-ENTRYPOINT /app/run.sh
+# Setup a healthcheck
+COPY health /app/health
+RUN apk add curl
+HEALTHCHECK --interval=10s --timeout=4s --retries=3 CMD /app/health
+
+ENTRYPOINT ["/app/fail2ban_exporter"]

Dockerfile.goreleaser

@@ -0,0 +1,15 @@
+FROM alpine
+
+# Create main app folder to run from
+WORKDIR /app
+
+# Copy compiled binary to release image
+# (must build the binary before running docker build)
+COPY fail2ban_exporter /app/fail2ban_exporter
+
+# Setup a healthcheck
+COPY health /app/health
+RUN apk add curl
+HEALTHCHECK --interval=10s --timeout=4s --retries=3 CMD /app/health
+
+ENTRYPOINT ["/app/fail2ban_exporter"]

Makefile

@@ -1,36 +1,55 @@
-go/dependencies:
-	cd src/ && go mod download
+# List make commands
+.PHONY: ls
+ls:
+	cat Makefile | grep "^[a-zA-Z#].*" | cut -d ":" -f 1 | sed s';#;\n#;'g
 
-# Make sure no unnecessary dependencies are present
-go/checkDependencies:
-	cd src/ && go mod tidy -v
-	git diff-index --quiet HEAD
+# Download dependencies
+.PHONY: download
+download:
+	go mod download
 
-# Standard go test
-go/test:
-	cd src/ && go test ./... -v -race
+# Update project dependencies
+.PHONY: update
+update:
+	go get -u
+	go mod download
+	go mod tidy
 
-go/fmt:
-	cd src/ && go fmt ./...
+# Run project tests
+.PHONY: test
+test: download
+	go test ./... -v -race
 
-go/checkFmt:
+# Look for "suspicious constructs" in source code
+.PHONY: vet
+vet: download
+	go vet ./...
+
+# Format code
+.PHONY: fmt
+fmt: download
+	go mod tidy
+	go fmt ./...
+
+# Check for unformatted go code
+.PHONY: check/fmt
+check/fmt: download
 	test -z $(shell gofmt -l .)
 
-docs/genChangelog:
-	./tools/git-chglog_linux_amd64 --config tools/chglog/config.yml 0.0.0.. > CHANGELOG_gen.md
-
-build/snapshot:
-	./tools/goreleaser_linux_amd64 --snapshot --rm-dist --skip-publish
-
-build/release:
-	./tools/goreleaser_linux_amd64 --rm-dist --skip-publish
+# Build project
+.PHONY: build
+build:
+	CGO_ENABLED=0 go build \
+	-ldflags "\
+	-X main.version=${shell git describe --tags} \
+	-X main.commit=${shell git rev-parse HEAD} \
+	-X main.date=${shell date --iso-8601=seconds} \
+	-X main.builtBy=manual \
+	" \
+	-o fail2ban_exporter \
+	exporter.go
 
+# Build project docker container
+.PHONY: build/docker
 build/docker:
-	cd src/ && go build -o exporter \
-     -ldflags '-X main.version=$(shell git describe --tags) -X main.commit=${shell git rev-parse HEAD} -X "main.date=${shell date --rfc-3339=seconds}" -X main.builtBy=docker' exporter.go
-
-docker/build/latest:
-	docker build -t registry.gitlab.com/hectorjsmith/fail2ban-prometheus-exporter:latest .
-
-docker/build/tag:
-	docker build -t registry.gitlab.com/hectorjsmith/fail2ban-prometheus-exporter:$(shell git describe --tags) .
+	docker build -t fail2ban-prometheus-exporter .

README.md

@@ -1,92 +1,44 @@
 # Fail2Ban Prometheus Exporter
 
-Go tool to collect and export metrics on Fail2Ban
+[![Pipeline](https://gitlab.com/hectorjsmith/fail2ban-prometheus-exporter/badges/main/pipeline.svg)](https://gitlab.com/hectorjsmith/fail2ban-prometheus-exporter)
+[![Go Report Card](https://goreportcard.com/badge/gitlab.com/hectorjsmith/fail2ban-prometheus-exporter)](https://goreportcard.com/report/gitlab.com/hectorjsmith/fail2ban-prometheus-exporter)
+
+Collect metrics from a running fail2ban instance.
 
 ## Table of Contents
-1. Introduction
-2. Running the Exporter
-3. Running in Docker
-4. Metrics
+1. Quick Start
+2. Metrics
+3. Configuration
+4. Building from source
+5. Textfile metrics
+6. Troubleshooting
 
-## 1. Introduction
-The exporter can collect metrics from 2 locations: the fail2ban server socket and the fail2ban server database.
+## 1. Quick Start
 
-Once the exporter is running, metrics are available at `localhost:9191/metrics`.
+The exporter can be run as a standalone binary or a docker container.
 
-(The default port is `9191` but can be modified with the `-port` flag)
+### 1.1. Standalone
 
-The exporter communicates with the fail2ban server over its socket.
-This allows the data collected by the exporter to always align with the output of the `fail2ban-client`.
-
-The default location of the socket is: `/var/run/fail2ban/fail2ban.sock`
-
-## 2. Running the Exporter
-
-The exporter is compiled and released as a single binary.
-This makes it very easy to run in any environment.
-No additional runtime dependencies are required.
-
-Compiled binaries for various platforms are provided in each release.
-See the [releases page](https://gitlab.com/hectorjsmith/fail2ban-prometheus-exporter/-/releases) for more information.
-
-**Usage**
-```
-$ fail2ban-prometheus-exporter -h
-
-  -port int
-        port to use for the metrics server (default 9191)
-  -socket string
-        path to the fail2ban server socket
-  -version
-        show version info and exit
-  -collector.textfile
-        enable the textfile collector
-  -collector.textfile.directory string
-        directory to read text files with metrics from
-```
-
-**Example**
+The following command will start collecting metrics from the `/var/run/fail2ban/fail2ban.sock` file and expose them on port `9191`.
 
 ```
-fail2ban-prometheus-exporter -socket /var/run/fail2ban/fail2ban.sock -port 9191
+$ fail2ban_exporter --collector.f2b.socket=/var/run/fail2ban/fail2ban.sock --web.listen-address=":9191"
+
+2022/02/20 09:54:06 fail2ban exporter version 0.8.1
+2022/02/20 09:54:06 starting server at :9191
+2022/02/20 09:54:06 reading metrics from fail2ban socket: /var/run/fail2ban/fail2ban.sock
+2022/02/20 09:54:06 metrics available at '/metrics'
+2022/02/20 09:54:06 ready
 ```
 
-Note that the exporter will need read access to the fail2ban socket.
+Binary files for each release can be found on the [releases](https://gitlab.com/hectorjsmith/fail2ban-prometheus-exporter/-/releases) page.
 
-### 2.1. Compile from Source
+There is also an [example systemd service file](/_examples/systemd/fail2ban_exporter.service) included in the repository.
+This is a starting point to run the exporter as a service.
 
-The code can be compiled from source by running `go build` inside the `src/` folder.
-Go version `1.15` or greater is required.
-
-Run `go mod download` to download all necessary dependencies before running the build.
-
-## 3. Running in Docker
-
-An official docker image is available on the Gitlab container registry.
-Use it by pulling the following image:
-
-```
-registry.gitlab.com/hectorjsmith/fail2ban-prometheus-exporter:latest
-```
-
-Use the `:latest` tag to get the most up to date code (less stable) or use one of the version tagged images to use a specific release.
-See the [registry page](https://gitlab.com/hectorjsmith/fail2ban-prometheus-exporter/container_registry) for all available tags.
-
-### 3.1. Volumes
-
-The docker image is designed to run by mounting the fail2ban run folder.
-The run folder should be mounted in the container at: `/var/run/fail2ban`.
-
-The folder can be mounted with read-only (`ro`) permissions.
-
-**NOTE:** While it is possible to mount the `fail2ban.sock` file directly, it is recommended to mount the parent folder instead.
-The `.sock` file is deleted by fail2ban on shutdown and re-created on startup and this causes problems for the docker mount.
-See [this reply](https://gitlab.com/hectorjsmith/fail2ban-prometheus-exporter/-/issues/11#note_665003499) for more details.
-
-### 3.2. Docker run
-
-Use the following command to run the exporter as a docker container.
+### 1.2. Docker
 
+**Docker run**
 ```
 docker run -d \
     --name "fail2ban-exporter" \
@@ -95,9 +47,7 @@ docker run -d \
     registry.gitlab.com/hectorjsmith/fail2ban-prometheus-exporter:latest
 ```
 
-### 3.3. Docker compose
-
-The following is a simple docker-compose file to run the exporter.
+**Docker compose**
 
 ```
 version: "2"
@@ -110,92 +60,39 @@ services:
     - "9191:9191"
 ```
 
-## 4. Metrics
+Use the `:latest` tag to get the latest stable release.
+See the [registry page](https://gitlab.com/hectorjsmith/fail2ban-prometheus-exporter/container_registry) for all available tags.
 
-Access exported metrics at the `/metrics` path on the configured port.
+**NOTE:** While it is possible to mount the `fail2ban.sock` file directly, it is recommended to mount the parent folder instead.
+The `.sock` file is deleted by fail2ban on shutdown and re-created on startup and this causes problems for the docker mount.
+See [this reply](https://gitlab.com/hectorjsmith/fail2ban-prometheus-exporter/-/issues/11#note_665003499) for more details.
 
-**Note on Fail2Ban Jails**
+## 2. Metrics
 
-fail2ban can be configured to process different log files and use different rules for each one.
-These separate configurations are referred to as *jails*.
+The exporter exposes the following metrics:
 
-For example, fail2ban can be configured to watch the system logs for failed SSH connections and Nextcloud logs for failed logins.
-In this configuration, there will be two jails - one for IPs banned from the SSH logs, and one for IPs banned from the Nextcloud logs.
+*All metric names are prefixed with `f2b_`*
 
-This tool exports several metrics *per jail*, meaning that it is possible to track how many IPs are being banned in each jail as well as the overall total.
-This can be useful to track what services are seeing more failed logins.
-
-### 4.1. Socket-based Metrics
-
-These are the metrics exported by reading data from the fail2ban server socket.
-All metrics are prefixed with `f2b_`.
-
-Exposed metrics:
-* `up` - Returns 1 if the fail2ban server is up and connection succeeds
-* `errors` - Number of errors since startup
-    * `db` - Errors connecting to the database
-    * `socket_conn` - Errors connecting to the fail2ban socket (e.g. connection refused)
-    * `socket_req` - Errors sending requests to the fail2ban server (e.g. invalid responses)
-* `jail_count` - Number of jails configured in fail2ban
-* `jail_banned_current` (per jail) - Number of IPs currently banned
-* `jail_banned_total` (per jail) - Total number of banned IPs since fail2ban startup (includes expired bans)
-* `jail_failed_current` (per jail) - Number of current failures
-* `jail_failed_total` (per jail) - Total number of failures since fail2ban startup
-* `jail_config_ban_time` (per jail) - How long an IP is banned for in this jail (in seconds)
-* `jail_config_find_time` (per jail) - How far back the filter will look for failures in this jail (in seconds)
-* `jail_config_max_retry` (per jail) - The max number of failures allowed before banning an IP in this jail
-* `version` - Version string of the exporter and fail2ban
-
-**Sample**
-
-```
-# HELP f2b_errors Number of errors found since startup
-# TYPE f2b_errors counter
-f2b_errors{type="db"} 0
-f2b_errors{type="socket_conn"} 0
-f2b_errors{type="socket_req"} 0
-# HELP f2b_jail_banned_current Number of IPs currently banned in this jail
-# TYPE f2b_jail_banned_current gauge
-f2b_jail_banned_current{jail="recidive"} 5
-f2b_jail_banned_current{jail="sshd"} 15
-# HELP f2b_jail_banned_total Total number of IPs banned by this jail (includes expired bans)
-# TYPE f2b_jail_banned_total gauge
-f2b_jail_banned_total{jail="recidive"} 6
-f2b_jail_banned_total{jail="sshd"} 31
-# HELP f2b_jail_count Number of defined jails
-# TYPE f2b_jail_count gauge
-f2b_jail_count 2
-# HELP f2b_jail_failed_current Number of current failures on this jail's filter
-# TYPE f2b_jail_failed_current gauge
-f2b_jail_failed_current{jail="recidive"} 5
-f2b_jail_failed_current{jail="sshd"} 6
-# HELP f2b_jail_failed_total Number of total failures on this jail's filter
-# TYPE f2b_jail_failed_total gauge
-f2b_jail_failed_total{jail="recidive"} 7
-f2b_jail_failed_total{jail="sshd"} 125
-# HELP f2b_config_jail_ban_time How long an IP is banned for in this jail (in seconds)
-# TYPE f2b_config_jail_ban_time gauge
-f2b_config_jail_ban_time{jail="recidive"} 604800
-f2b_config_jail_ban_time{jail="sshd"} 600
-# HELP f2b_config_jail_find_time How far back will the filter look for failures in this jail (in seconds)
-# TYPE f2b_config_jail_find_time gauge
-f2b_config_jail_find_time{jail="recidive"} 86400
-f2b_config_jail_find_time{jail="sshd"} 600
-# HELP f2b_config_jail_max_retries The number of failures allowed until the IP is banned by this jail
-# TYPE f2b_config_jail_max_retries gauge
-f2b_config_jail_max_retries{jail="recidive"} 5
-f2b_config_jail_max_retries{jail="sshd"} 5
-# HELP f2b_up Check if the fail2ban server is up
-# TYPE f2b_up gauge
-f2b_up 1
-# HELP f2b_version Version of the exporter and fail2ban server
-# TYPE f2b_version gauge
-f2b_version{exporter="0.3.0",fail2ban="0.11.1"} 1
-```
+| Metric                       | Description                                                                        | Example                                             |
+|------------------------------|------------------------------------------------------------------------------------|-----------------------------------------------------|
+| `up`                         | Returns 1 if the exporter is up and running                                        | `f2b_up 1`                                          |
+| `errors`                     | Count the number of errors since startup by type                                   |                                                     |
+| `errors{type="socket_conn"}` | Errors connecting to the fail2ban socket (e.g. connection refused)                 | `f2b_errors{type="socket_conn"} 0`                  |
+| `errors{type="socket_req"}`  | Errors sending requests to the fail2ban server (e.g. invalid responses)            | `f2b_errors{type="socket_req"} 0`                   |
+| `jail_count`                 | Number of jails configured in fail2ban                                             | `f2b_jail_count 2`                                  |
+| `jail_banned_current`        | Number of IPs currently banned per jail                                            | `f2b_jail_banned_current{jail="sshd"} 15`           |
+| `jail_banned_total`          | Total number of banned IPs since fail2ban startup per jail (includes expired bans) | `f2b_jail_banned_total{jail="sshd"} 31`             |
+| `jail_failed_current`        | Number of current failures per jail                                                | `f2b_jail_failed_current{jail="sshd"} 6`            |
+| `jail_failed_total`          | Total number of failures since fail2ban startup per jail                           | `f2b_jail_failed_total{jail="sshd"} 125`            |
+| `jail_config_ban_time`       | How long an IP is banned for in this jail (in seconds)                             | `f2b_config_jail_ban_time{jail="sshd"} 600`         |
+| `jail_config_find_time`      | How far back the filter will look for failures in this jail (in seconds)           | `f2b_config_jail_find_time{jail="sshd"} 600`        |
+| `jail_config_max_retry`      | The max number of failures allowed before banning an IP in this jail               | `f2b_config_jail_max_retries{jail="sshd"} 5`        |
+| `version`                    | Version string of the exporter and fail2ban                                        | `f2b_version{exporter="0.5.0",fail2ban="0.11.1"} 1` |
 
 The metrics above correspond to the matching fields in the `fail2ban-client status <jail>` command:
 ```
-Status for the jail: sshd|- Filter
+Status for the jail: sshd
+|- Filter
 |  |- Currently failed: 6
 |  |- Total failed:     125
 |  `- File list:        /var/log/auth.log
@@ -205,13 +102,79 @@ Status for the jail: sshd|- Filter
    `- Banned IP list:   ...
 ```
 
-### 4.2. Textfile Metrics
+### 2.1. Grafana
+
+The metrics exported by this tool are compatible with Prometheus and Grafana.
+A sample grafana dashboard can be found in the [grafana.json](/_examples/grafana/dashboard.json) file.
+Just import the contents of this file into a new Grafana dashboard to get started.
+
+The dashboard supports displaying data from multiple exporters. Use the `instance` dashboard variable to select which ones to display.
+
+*(Sample dashboard is compatible with Grafana `9.1.8` and above)*
+
+## 3. Configuration
+
+The exporter is configured with CLI flags and environment variables.
+There are no configuration files.
+
+**CLI flags**
+```
+🚀 Collect prometheus metrics from a running Fail2Ban instance
+
+Flags:
+  -h, --help                          Show context-sensitive help.
+  -v, --version                       Show version info and exit
+      --dry-run                       Attempt to connect to the fail2ban socket then exit
+                                      before starting the server
+      --web.listen-address=":9191"    Address to use for the metrics server
+                                      ($F2B_WEB_LISTEN_ADDRESS)
+      --collector.f2b.socket="/var/run/fail2ban/fail2ban.sock"
+                                      Path to the fail2ban server socket
+                                      ($F2B_COLLECTOR_SOCKET)
+      --collector.f2b.exit-on-socket-connection-error
+                                      When set to true the exporter will immediately
+                                      exit on a fail2ban socket connection error
+                                      ($F2B_EXIT_ON_SOCKET_CONN_ERROR)
+      --collector.textfile.directory=STRING
+                                      Directory to read text files with metrics from
+                                      ($F2B_COLLECTOR_TEXT_PATH)
+      --web.basic-auth.username=STRING
+                                      Username to use to protect endpoints with basic auth
+                                      ($F2B_WEB_BASICAUTH_USER)
+      --web.basic-auth.password=STRING
+                                      Password to use to protect endpoints with basic auth
+                                      ($F2B_WEB_BASICAUTH_PASS)
+```
+
+**Environment variables**
+
+Each environment variable corresponds to a CLI flag.
+If both are specified, the CLI flag takes precedence.
+
+| Environment variable            | Corresponding CLI flag                            |
+|---------------------------------|---------------------------------------------------|
+| `F2B_COLLECTOR_SOCKET`          | `--collector.f2b.socket`                          |
+| `F2B_COLLECTOR_TEXT_PATH`       | `--collector.textfile.directory`                  |
+| `F2B_WEB_LISTEN_ADDRESS`        | `--web.listen-address`                            |
+| `F2B_WEB_BASICAUTH_USER`        | `--web.basic-auth.username`                       |
+| `F2B_WEB_BASICAUTH_PASS`        | `--web.basic-auth.password`                       |
+| `F2B_EXIT_ON_SOCKET_CONN_ERROR` | `--collector.f2b.exit-on-socket-connection-error` |
+
+## 4. Building from source
+
+Building from source has the following dependencies:
+- Go v1.20
+- Make
+
+From there, simply run `make build`
+
+This will download the necessary dependencies and build a `fail2ban_exporter` binary in the root of the project.
+
+## 5. Textfile metrics
 
 For more flexibility the exporter also allows exporting metrics collected from a text file.
 
-To enable textfile metrics:
-1. Enable the collector with `-collector.textfile=true`
-2. Provide the directory to read files from with the `-collector.textfile.directory` flag
+To enable textfile metrics provide the directory to read files from with the `--collector.textfile.directory` flag.
 
 Metrics collected from these files will be exposed directly alongside the other metrics without any additional processing.
 This means that it is the responsibility of the file creator to ensure the format is correct.
@@ -225,3 +188,52 @@ textfile_error{path="file.prom"} 0
 ```
 
 **NOTE:** Any file not ending with `.prom` will be ignored.
+
+**Running in Docker**
+
+To collect textfile metrics inside a docker container, a couple of things need to be done:
+1. Mount the folder with the metrics files
+2. Set the `F2B_COLLECTOR_TEXT_PATH` environment variable
+
+*For example:*
+```
+docker run -d \
+    --name "fail2ban-exporter" \
+    -v /var/run/fail2ban:/var/run/fail2ban:ro \
+    -v /path/to/metrics:/app/metrics/:ro \
+    -e F2B_COLLECTOR_TEXT_PATH=/app/metrics \
+    -p "9191:9191" \
+    registry.gitlab.com/hectorjsmith/fail2ban-prometheus-exporter:latest
+```
+
+## 6. Troubleshooting
+
+### 6.1. "no such file or directory"
+
+```
+error opening socket: dial unix /var/run/fail2ban/fail2ban.sock: connect: no such file or directory
+```
+
+There are a couple of potential causes for the error above.
+
+**File not found**
+
+The first is that the file does not exist, so first check that the file path shown in the error actually exists on the system running the exporter.
+The fail2ban server may be storing the socket file in another location on your machine.
+
+If you are using docker, make sure the correct host folder was mounted to the correct location.
+
+If the file is not in the expected location, you can run the exporter with the corresponding CLI flag or environment variable to use a different file path.
+
+**Permissions**
+
+If the file does exist, the likely cause are file permissions.
+By default, the fail2ban server runs as the `root` user and the socket file can only be accessed by the same user.
+If you are running the exporter as a non-root user, it will not be able to open the socket file to read/write commands to the server, leading to the error above.
+
+In this case there are a few solutions:
+1. Run the exporter as the same user as fail2ban (usually `root`)
+2. Update the fail2ban server config to run as a non-root user, then run the exporter as the same user
+3. Update the socket file permissions to be less restrictive
+
+I would recommend option `1.` since it is the simplest. Option `2.` is a bit more complex, check the [fail2ban server documentation](https://coderwall.com/p/haj28a/running-rootless-fail2ban-on-debian) for more details. And option `3.` is just a temporary fix. The socket file gets re-created each time the fail2ban server is restarted and the original permissions will be restored, so you will need to update the permissions every time the server restarts.

_examples/grafana/dashboard.json

@@ -0,0 +1,877 @@
+{
+  "__inputs": [
+    {
+      "name": "DS_PROMETHEUS",
+      "label": "Prometheus",
+      "description": "",
+      "type": "datasource",
+      "pluginId": "prometheus",
+      "pluginName": "Prometheus"
+    }
+  ],
+  "__elements": {},
+  "__requires": [
+    {
+      "type": "grafana",
+      "id": "grafana",
+      "name": "Grafana",
+      "version": "9.1.8"
+    },
+    {
+      "type": "datasource",
+      "id": "prometheus",
+      "name": "Prometheus",
+      "version": "1.0.0"
+    },
+    {
+      "type": "panel",
+      "id": "table",
+      "name": "Table",
+      "version": ""
+    },
+    {
+      "type": "panel",
+      "id": "timeseries",
+      "name": "Time series",
+      "version": ""
+    }
+  ],
+  "annotations": {
+    "list": [
+      {
+        "builtIn": 1,
+        "datasource": {
+          "type": "datasource",
+          "uid": "grafana"
+        },
+        "enable": true,
+        "hide": true,
+        "iconColor": "rgba(0, 211, 255, 1)",
+        "name": "Annotations & Alerts",
+        "target": {
+          "limit": 100,
+          "matchAny": false,
+          "tags": [],
+          "type": "dashboard"
+        },
+        "type": "dashboard"
+      }
+    ]
+  },
+  "editable": true,
+  "fiscalYearStartMonth": 0,
+  "graphTooltip": 2,
+  "id": null,
+  "links": [],
+  "liveNow": false,
+  "panels": [
+    {
+      "datasource": {
+        "type": "prometheus",
+        "uid": "${DS_PROMETHEUS}"
+      },
+      "description": "",
+      "fieldConfig": {
+        "defaults": {
+          "color": {
+            "mode": "thresholds"
+          },
+          "custom": {
+            "align": "auto",
+            "displayMode": "auto",
+            "inspect": false
+          },
+          "mappings": [],
+          "thresholds": {
+            "mode": "absolute",
+            "steps": [
+              {
+                "color": "green",
+                "value": null
+              }
+            ]
+          }
+        },
+        "overrides": [
+          {
+            "matcher": {
+              "id": "byRegexp",
+              "options": ".*Time"
+            },
+            "properties": [
+              {
+                "id": "unit",
+                "value": "s"
+              }
+            ]
+          }
+        ]
+      },
+      "gridPos": {
+        "h": 6,
+        "w": 24,
+        "x": 0,
+        "y": 0
+      },
+      "id": 206,
+      "options": {
+        "footer": {
+          "fields": "",
+          "reducer": [
+            "sum"
+          ],
+          "show": false
+        },
+        "showHeader": true
+      },
+      "pluginVersion": "9.1.8",
+      "targets": [
+        {
+          "datasource": {
+            "type": "prometheus",
+            "uid": "${DS_PROMETHEUS}"
+          },
+          "editorMode": "code",
+          "exemplar": false,
+          "expr": "f2b_config_jail_max_retries{instance=~\"$instance\"}",
+          "format": "table",
+          "instant": true,
+          "interval": "",
+          "legendFormat": "{{jail}}",
+          "refId": "A"
+        },
+        {
+          "datasource": {
+            "type": "prometheus",
+            "uid": "${DS_PROMETHEUS}"
+          },
+          "editorMode": "code",
+          "exemplar": false,
+          "expr": "f2b_config_jail_ban_time{instance=~\"$instance\"}",
+          "format": "table",
+          "hide": false,
+          "instant": true,
+          "interval": "",
+          "legendFormat": "{{jail}}",
+          "refId": "B"
+        },
+        {
+          "datasource": {
+            "type": "prometheus",
+            "uid": "${DS_PROMETHEUS}"
+          },
+          "editorMode": "code",
+          "exemplar": false,
+          "expr": "f2b_config_jail_find_time{instance=~\"$instance\"}",
+          "format": "table",
+          "hide": false,
+          "instant": true,
+          "interval": "",
+          "legendFormat": "{{jail}}",
+          "refId": "C"
+        }
+      ],
+      "title": "F2B Config",
+      "transformations": [
+        {
+          "id": "merge",
+          "options": {}
+        },
+        {
+          "id": "groupBy",
+          "options": {
+            "fields": {
+              "Value #A": {
+                "aggregations": [
+                  "lastNotNull"
+                ],
+                "operation": "aggregate"
+              },
+              "Value #B": {
+                "aggregations": [
+                  "lastNotNull"
+                ],
+                "operation": "aggregate"
+              },
+              "Value #C": {
+                "aggregations": [
+                  "lastNotNull"
+                ],
+                "operation": "aggregate"
+              },
+              "instance": {
+                "aggregations": [],
+                "operation": "groupby"
+              },
+              "jail": {
+                "aggregations": [],
+                "operation": "groupby"
+              }
+            }
+          }
+        },
+        {
+          "id": "organize",
+          "options": {
+            "excludeByName": {},
+            "indexByName": {},
+            "renameByName": {
+              "Value #A (lastNotNull)": "Max Retries",
+              "Value #B (lastNotNull)": "Ban Time",
+              "Value #C (lastNotNull)": "Find Time",
+              "jail": "Jail"
+            }
+          }
+        }
+      ],
+      "transparent": true,
+      "type": "table"
+    },
+    {
+      "datasource": {
+        "type": "prometheus",
+        "uid": "${DS_PROMETHEUS}"
+      },
+      "description": "",
+      "fieldConfig": {
+        "defaults": {
+          "color": {
+            "mode": "palette-classic"
+          },
+          "custom": {
+            "axisCenteredZero": false,
+            "axisColorMode": "text",
+            "axisLabel": "",
+            "axisPlacement": "auto",
+            "barAlignment": 0,
+            "drawStyle": "line",
+            "fillOpacity": 10,
+            "gradientMode": "none",
+            "hideFrom": {
+              "legend": false,
+              "tooltip": false,
+              "viz": false
+            },
+            "lineInterpolation": "linear",
+            "lineWidth": 1,
+            "pointSize": 5,
+            "scaleDistribution": {
+              "type": "linear"
+            },
+            "showPoints": "never",
+            "spanNulls": true,
+            "stacking": {
+              "group": "A",
+              "mode": "none"
+            },
+            "thresholdsStyle": {
+              "mode": "off"
+            }
+          },
+          "mappings": [],
+          "min": 0,
+          "thresholds": {
+            "mode": "absolute",
+            "steps": [
+              {
+                "color": "green",
+                "value": null
+              }
+            ]
+          },
+          "unit": "short"
+        },
+        "overrides": []
+      },
+      "gridPos": {
+        "h": 8,
+        "w": 12,
+        "x": 0,
+        "y": 6
+      },
+      "id": 190,
+      "options": {
+        "legend": {
+          "calcs": [
+            "lastNotNull"
+          ],
+          "displayMode": "table",
+          "placement": "right",
+          "showLegend": true
+        },
+        "tooltip": {
+          "mode": "single",
+          "sort": "none"
+        }
+      },
+      "pluginVersion": "8.2.1",
+      "targets": [
+        {
+          "datasource": {
+            "type": "prometheus",
+            "uid": "${DS_PROMETHEUS}"
+          },
+          "editorMode": "code",
+          "exemplar": true,
+          "expr": "f2b_jail_failed_total{instance=~\"$instance\"}",
+          "hide": false,
+          "interval": "",
+          "legendFormat": "{{jail}} ({{instance}})",
+          "range": true,
+          "refId": "A"
+        }
+      ],
+      "title": "Fail2Ban Failures (Total)",
+      "transparent": true,
+      "type": "timeseries"
+    },
+    {
+      "datasource": {
+        "type": "prometheus",
+        "uid": "${DS_PROMETHEUS}"
+      },
+      "description": "",
+      "fieldConfig": {
+        "defaults": {
+          "color": {
+            "mode": "palette-classic"
+          },
+          "custom": {
+            "axisCenteredZero": false,
+            "axisColorMode": "text",
+            "axisLabel": "",
+            "axisPlacement": "auto",
+            "barAlignment": 0,
+            "drawStyle": "line",
+            "fillOpacity": 10,
+            "gradientMode": "none",
+            "hideFrom": {
+              "legend": false,
+              "tooltip": false,
+              "viz": false
+            },
+            "lineInterpolation": "linear",
+            "lineWidth": 1,
+            "pointSize": 5,
+            "scaleDistribution": {
+              "type": "linear"
+            },
+            "showPoints": "never",
+            "spanNulls": true,
+            "stacking": {
+              "group": "A",
+              "mode": "none"
+            },
+            "thresholdsStyle": {
+              "mode": "off"
+            }
+          },
+          "mappings": [],
+          "min": 0,
+          "thresholds": {
+            "mode": "absolute",
+            "steps": [
+              {
+                "color": "green",
+                "value": null
+              }
+            ]
+          },
+          "unit": "short"
+        },
+        "overrides": []
+      },
+      "gridPos": {
+        "h": 8,
+        "w": 12,
+        "x": 12,
+        "y": 6
+      },
+      "id": 191,
+      "options": {
+        "legend": {
+          "calcs": [
+            "lastNotNull"
+          ],
+          "displayMode": "table",
+          "placement": "right",
+          "showLegend": true
+        },
+        "tooltip": {
+          "mode": "single",
+          "sort": "none"
+        }
+      },
+      "pluginVersion": "8.2.1",
+      "targets": [
+        {
+          "datasource": {
+            "type": "prometheus",
+            "uid": "${DS_PROMETHEUS}"
+          },
+          "editorMode": "code",
+          "exemplar": true,
+          "expr": "f2b_jail_banned_total{instance=~\"$instance\"}",
+          "interval": "",
+          "legendFormat": "{{jail}} ({{instance}})",
+          "range": true,
+          "refId": "A"
+        }
+      ],
+      "title": "Fail2Ban Bans (Total)",
+      "transparent": true,
+      "type": "timeseries"
+    },
+    {
+      "datasource": {
+        "type": "prometheus",
+        "uid": "${DS_PROMETHEUS}"
+      },
+      "description": "",
+      "fieldConfig": {
+        "defaults": {
+          "color": {
+            "mode": "palette-classic"
+          },
+          "custom": {
+            "axisCenteredZero": false,
+            "axisColorMode": "text",
+            "axisLabel": "",
+            "axisPlacement": "auto",
+            "barAlignment": 0,
+            "drawStyle": "line",
+            "fillOpacity": 10,
+            "gradientMode": "none",
+            "hideFrom": {
+              "legend": false,
+              "tooltip": false,
+              "viz": false
+            },
+            "lineInterpolation": "linear",
+            "lineWidth": 1,
+            "pointSize": 5,
+            "scaleDistribution": {
+              "type": "linear"
+            },
+            "showPoints": "never",
+            "spanNulls": true,
+            "stacking": {
+              "group": "A",
+              "mode": "none"
+            },
+            "thresholdsStyle": {
+              "mode": "off"
+            }
+          },
+          "mappings": [],
+          "min": 0,
+          "thresholds": {
+            "mode": "absolute",
+            "steps": [
+              {
+                "color": "green",
+                "value": null
+              }
+            ]
+          },
+          "unit": "short"
+        },
+        "overrides": []
+      },
+      "gridPos": {
+        "h": 8,
+        "w": 12,
+        "x": 0,
+        "y": 14
+      },
+      "id": 208,
+      "options": {
+        "legend": {
+          "calcs": [
+            "lastNotNull"
+          ],
+          "displayMode": "table",
+          "placement": "right",
+          "showLegend": true
+        },
+        "tooltip": {
+          "mode": "single",
+          "sort": "none"
+        }
+      },
+      "pluginVersion": "8.2.1",
+      "targets": [
+        {
+          "datasource": {
+            "type": "prometheus",
+            "uid": "${DS_PROMETHEUS}"
+          },
+          "editorMode": "code",
+          "exemplar": true,
+          "expr": "f2b_jail_failed_current{instance=~\"$instance\"}",
+          "interval": "",
+          "legendFormat": "{{jail}} ({{instance}})",
+          "range": true,
+          "refId": "A"
+        }
+      ],
+      "title": "Fail2Ban Failures (Current)",
+      "transparent": true,
+      "type": "timeseries"
+    },
+    {
+      "datasource": {
+        "type": "prometheus",
+        "uid": "${DS_PROMETHEUS}"
+      },
+      "description": "",
+      "fieldConfig": {
+        "defaults": {
+          "color": {
+            "mode": "palette-classic"
+          },
+          "custom": {
+            "axisCenteredZero": false,
+            "axisColorMode": "text",
+            "axisLabel": "",
+            "axisPlacement": "auto",
+            "barAlignment": 0,
+            "drawStyle": "line",
+            "fillOpacity": 10,
+            "gradientMode": "none",
+            "hideFrom": {
+              "legend": false,
+              "tooltip": false,
+              "viz": false
+            },
+            "lineInterpolation": "linear",
+            "lineWidth": 1,
+            "pointSize": 5,
+            "scaleDistribution": {
+              "type": "linear"
+            },
+            "showPoints": "never",
+            "spanNulls": true,
+            "stacking": {
+              "group": "A",
+              "mode": "none"
+            },
+            "thresholdsStyle": {
+              "mode": "off"
+            }
+          },
+          "mappings": [],
+          "min": 0,
+          "thresholds": {
+            "mode": "absolute",
+            "steps": [
+              {
+                "color": "green",
+                "value": null
+              }
+            ]
+          },
+          "unit": "short"
+        },
+        "overrides": []
+      },
+      "gridPos": {
+        "h": 8,
+        "w": 12,
+        "x": 12,
+        "y": 14
+      },
+      "id": 209,
+      "options": {
+        "legend": {
+          "calcs": [
+            "lastNotNull"
+          ],
+          "displayMode": "table",
+          "placement": "right",
+          "showLegend": true
+        },
+        "tooltip": {
+          "mode": "single",
+          "sort": "none"
+        }
+      },
+      "pluginVersion": "8.2.1",
+      "targets": [
+        {
+          "datasource": {
+            "type": "prometheus",
+            "uid": "${DS_PROMETHEUS}"
+          },
+          "editorMode": "code",
+          "exemplar": true,
+          "expr": "f2b_jail_banned_current{instance=~\"$instance\"}",
+          "interval": "",
+          "legendFormat": "{{jail}} ({{instance}})",
+          "range": true,
+          "refId": "A"
+        }
+      ],
+      "title": "Fail2Ban Bans (Current)",
+      "transparent": true,
+      "type": "timeseries"
+    },
+    {
+      "datasource": {
+        "type": "prometheus",
+        "uid": "${DS_PROMETHEUS}"
+      },
+      "description": "",
+      "fieldConfig": {
+        "defaults": {
+          "color": {
+            "mode": "palette-classic"
+          },
+          "custom": {
+            "axisCenteredZero": false,
+            "axisColorMode": "text",
+            "axisLabel": "",
+            "axisPlacement": "auto",
+            "barAlignment": 0,
+            "drawStyle": "line",
+            "fillOpacity": 10,
+            "gradientMode": "none",
+            "hideFrom": {
+              "legend": false,
+              "tooltip": false,
+              "viz": false
+            },
+            "lineInterpolation": "linear",
+            "lineWidth": 1,
+            "pointSize": 5,
+            "scaleDistribution": {
+              "type": "linear"
+            },
+            "showPoints": "never",
+            "spanNulls": true,
+            "stacking": {
+              "group": "A",
+              "mode": "none"
+            },
+            "thresholdsStyle": {
+              "mode": "off"
+            }
+          },
+          "mappings": [],
+          "max": 1,
+          "min": 0,
+          "thresholds": {
+            "mode": "absolute",
+            "steps": [
+              {
+                "color": "green",
+                "value": null
+              }
+            ]
+          },
+          "unit": "short"
+        },
+        "overrides": []
+      },
+      "gridPos": {
+        "h": 5,
+        "w": 12,
+        "x": 0,
+        "y": 22
+      },
+      "id": 203,
+      "options": {
+        "legend": {
+          "calcs": [
+            "lastNotNull"
+          ],
+          "displayMode": "table",
+          "placement": "right",
+          "showLegend": true
+        },
+        "tooltip": {
+          "mode": "single",
+          "sort": "none"
+        }
+      },
+      "pluginVersion": "8.2.1",
+      "targets": [
+        {
+          "datasource": {
+            "type": "prometheus",
+            "uid": "${DS_PROMETHEUS}"
+          },
+          "editorMode": "code",
+          "exemplar": true,
+          "expr": "f2b_up{instance=~\"$instance\"}",
+          "interval": "",
+          "legendFormat": "Up ({{instance}})",
+          "range": true,
+          "refId": "A"
+        }
+      ],
+      "title": "Fail2Ban Up",
+      "transparent": true,
+      "type": "timeseries"
+    },
+    {
+      "datasource": {
+        "type": "prometheus",
+        "uid": "${DS_PROMETHEUS}"
+      },
+      "description": "",
+      "fieldConfig": {
+        "defaults": {
+          "color": {
+            "mode": "palette-classic"
+          },
+          "custom": {
+            "axisCenteredZero": false,
+            "axisColorMode": "text",
+            "axisLabel": "",
+            "axisPlacement": "auto",
+            "barAlignment": 0,
+            "drawStyle": "line",
+            "fillOpacity": 10,
+            "gradientMode": "none",
+            "hideFrom": {
+              "legend": false,
+              "tooltip": false,
+              "viz": false
+            },
+            "lineInterpolation": "linear",
+            "lineWidth": 1,
+            "pointSize": 5,
+            "scaleDistribution": {
+              "type": "linear"
+            },
+            "showPoints": "never",
+            "spanNulls": true,
+            "stacking": {
+              "group": "A",
+              "mode": "none"
+            },
+            "thresholdsStyle": {
+              "mode": "off"
+            }
+          },
+          "mappings": [],
+          "max": 1,
+          "min": 0,
+          "thresholds": {
+            "mode": "absolute",
+            "steps": [
+              {
+                "color": "green",
+                "value": null
+              }
+            ]
+          },
+          "unit": "short"
+        },
+        "overrides": []
+      },
+      "gridPos": {
+        "h": 5,
+        "w": 12,
+        "x": 12,
+        "y": 22
+      },
+      "id": 204,
+      "options": {
+        "legend": {
+          "calcs": [
+            "lastNotNull"
+          ],
+          "displayMode": "table",
+          "placement": "right",
+          "showLegend": true
+        },
+        "tooltip": {
+          "mode": "single",
+          "sort": "none"
+        }
+      },
+      "pluginVersion": "8.2.1",
+      "targets": [
+        {
+          "datasource": {
+            "type": "prometheus",
+            "uid": "${DS_PROMETHEUS}"
+          },
+          "editorMode": "code",
+          "exemplar": true,
+          "expr": "f2b_errors{instance=~\"$instance\"}",
+          "interval": "",
+          "legendFormat": "{{type}} ({{instance}})",
+          "range": true,
+          "refId": "A"
+        }
+      ],
+      "title": "Fail2Ban Exporter Errors",
+      "transparent": true,
+      "type": "timeseries"
+    }
+  ],
+  "refresh": "30s",
+  "schemaVersion": 37,
+  "style": "dark",
+  "tags": [],
+  "templating": {
+    "list": [
+      {
+        "current": {
+          "selected": false,
+          "text": "Prometheus",
+          "value": "Prometheus"
+        },
+        "hide": 0,
+        "includeAll": false,
+        "label": "Data Source",
+        "multi": false,
+        "name": "DataSource",
+        "options": [],
+        "query": "prometheus",
+        "queryValue": "",
+        "refresh": 1,
+        "regex": "",
+        "skipUrlSync": false,
+        "type": "datasource"
+      },
+      {
+        "current": {},
+        "datasource": {
+          "type": "prometheus",
+          "uid": "${DS_PROMETHEUS}"
+        },
+        "definition": "f2b_up",
+        "description": "Select which instance(s) to show",
+        "hide": 0,
+        "includeAll": false,
+        "label": "Instance",
+        "multi": true,
+        "name": "instance",
+        "options": [],
+        "query": {
+          "query": "f2b_up",
+          "refId": "StandardVariableQuery"
+        },
+        "refresh": 1,
+        "regex": "/.*instance=\"([^\"]+)\"/",
+        "skipUrlSync": false,
+        "sort": 0,
+        "type": "query"
+      }
+    ]
+  },
+  "time": {
+    "from": "now-6h",
+    "to": "now"
+  },
+  "timepicker": {},
+  "timezone": "",
+  "title": "F2B",
+  "uid": "cTkH9AT7z",
+  "version": 3,
+  "weekStart": ""
+}

_examples/systemd/README.md

@@ -0,0 +1,7 @@
+# Systemd
+
+The `.service` file in this directory should be copied to the `/etc/systemd/system/` folder.
+- It expects the binary file to be installed at `/usr/sbin/fail2ban_exporter`.
+- It expects a user named `fail2ban_exporter` to exist. This user should not have a shell or any special privileges aside from read-access to the fail2ban socket file.
+
+The `ExecStart` line can be modified to add any custom CLI flags.

_examples/systemd/fail2ban_exporter.service

@@ -0,0 +1,19 @@
+[Unit]
+Description=Fail2ban metric exporter for Prometheus
+Documentation=https://gitlab.com/hectorjsmith/fail2ban-prometheus-exporter/-/blob/main/README.md
+Requires=network-online.target
+After=network-online.target
+
+[Service]
+ExecStart=/usr/sbin/fail2ban_exporter
+Restart=on-failure
+RestartSec=5s
+NoNewPrivileges=true
+
+# Currently need to run the exporter as root to ensure it has read/write access to the
+# fail2ban socket file.
+User=root
+Group=root
+
+[Install]
+WantedBy=multi-user.target

auth/basic.go

@@ -0,0 +1,29 @@
+package auth
+
+import (
+	"fmt"
+	"net/http"
+)
+
+func NewBasicAuthProvider(username, password string) AuthProvider {
+	return &basicAuthProvider{
+		hashedAuth: encodeBasicAuth(username, password),
+	}
+}
+
+type basicAuthProvider struct {
+	hashedAuth string
+}
+
+func (p *basicAuthProvider) IsAllowed(request *http.Request) bool {
+	username, password, ok := request.BasicAuth()
+	if !ok {
+		return false
+	}
+	requestAuth := encodeBasicAuth(username, password)
+	return p.hashedAuth == requestAuth
+}
+
+func encodeBasicAuth(username, password string) string {
+	return HashString(fmt.Sprintf("%s:%s", username, password))
+}

auth/basic_test.go

@@ -0,0 +1,53 @@
+package auth
+
+import (
+	"net/http"
+	"net/http/httptest"
+	"testing"
+)
+
+func Test_GIVEN_BasicAuthSet_WHEN_CallingIsAllowedWithCorrectCreds_THEN_TrueReturned(t *testing.T) {
+	// assemble
+	username := "u1"
+	password := HashString("abc")
+	request := httptest.NewRequest(http.MethodGet, "http://example.com", nil)
+	request.SetBasicAuth(username, password)
+	provider := NewBasicAuthProvider(username, password)
+
+	// act
+	result := provider.IsAllowed(request)
+
+	// assert
+	if !result {
+		t.Errorf("expected request to be allowed, but failed")
+	}
+}
+
+func Test_GIVEN_BasicAuthSet_WHEN_CallingIsAllowedWithoutCreds_THEN_FalseReturned(t *testing.T) {
+	// assemble
+	request := httptest.NewRequest(http.MethodGet, "http://example.com", nil)
+	provider := NewBasicAuthProvider("u1", "p1")
+
+	// act
+	result := provider.IsAllowed(request)
+
+	// assert
+	if result {
+		t.Errorf("expected request to be denied, but was allowed")
+	}
+}
+
+func Test_GIVEN_BasicAuthSet_WHEN_CallingIsAllowedWithWrongCreds_THEN_FalseReturned(t *testing.T) {
+	// assemble
+	request := httptest.NewRequest(http.MethodGet, "http://example.com", nil)
+	request.SetBasicAuth("wrong", "pw")
+	provider := NewBasicAuthProvider("u1", "p1")
+
+	// act
+	result := provider.IsAllowed(request)
+
+	// assert
+	if result {
+		t.Errorf("expected request to be denied, but was allowed")
+	}
+}

auth/empty.go

@@ -0,0 +1,14 @@
+package auth
+
+import "net/http"
+
+func NewEmptyAuthProvider() AuthProvider {
+	return &emptyAuthProvider{}
+}
+
+type emptyAuthProvider struct {
+}
+
+func (p *emptyAuthProvider) IsAllowed(request *http.Request) bool {
+	return true
+}

auth/empty_test.go

@@ -0,0 +1,36 @@
+package auth
+
+import (
+	"net/http"
+	"net/http/httptest"
+	"testing"
+)
+
+func Test_GIVEN_EmptyAuth_WHEN_CallingIsAllowedWithoutAuth_THEN_TrueReturned(t *testing.T) {
+	// assemble
+	request := httptest.NewRequest(http.MethodGet, "http://example.com", nil)
+	provider := NewEmptyAuthProvider()
+
+	// act
+	response := provider.IsAllowed(request)
+
+	// assert
+	if !response {
+		t.Errorf("expected request to be allowed, but failed")
+	}
+}
+
+func Test_GIVEN_EmptyAuth_WHEN_CallingIsAllowedWithAuth_THEN_TrueReturned(t *testing.T) {
+	// assemble
+	request := httptest.NewRequest(http.MethodGet, "http://example.com", nil)
+	request.SetBasicAuth("user", "pass")
+	provider := NewEmptyAuthProvider()
+
+	// act
+	response := provider.IsAllowed(request)
+
+	// assert
+	if !response {
+		t.Errorf("expected request to be allowed, but failed")
+	}
+}

auth/hash.go

@@ -0,0 +1,18 @@
+package auth
+
+import (
+	"crypto/sha256"
+	"encoding/hex"
+)
+
+func hash(data []byte) []byte {
+	if len(data) == 0 {
+		return []byte{}
+	}
+	b := sha256.Sum256(data)
+	return b[:]
+}
+
+func HashString(data string) string {
+	return hex.EncodeToString(hash([]byte(data)))
+}

auth/hash_test.go

@@ -0,0 +1,26 @@
+package auth
+
+import (
+	"reflect"
+	"testing"
+)
+
+func TestHashString(t *testing.T) {
+	tests := []struct {
+		name string
+		args string
+		want string
+	}{
+		{"Happy path #1", "123", "a665a45920422f9d417e4867efdc4fb8a04a1f3fff1fa07e998e86f7f7a27ae3"},
+		{"Happy path #2", "hello world", "b94d27b9934d3e08a52e52d7da7dabfac484efe37a5380ee9088f7ace2efcde9"},
+		{"Happy path #3", "H3Ll0_W0RLD", "d58a27fe9a6e73a1d8a67189fb8acace047e7a1a795276a0056d3717ad61bd0e"},
+		{"Blank string", "", ""},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			if got := HashString(tt.args); !reflect.DeepEqual(got, tt.want) {
+				t.Errorf("HashString() = %v, want %v", got, tt.want)
+			}
+		})
+	}
+}

auth/provider.go

@@ -0,0 +1,9 @@
+package auth
+
+import (
+	"net/http"
+)
+
+type AuthProvider interface {
+	IsAllowed(*http.Request) bool
+}

cfg/cfg.go

@@ -0,0 +1,84 @@
+package cfg
+
+import (
+	"fmt"
+	"log"
+	"os"
+
+	"github.com/alecthomas/kong"
+	"gitlab.com/hectorjsmith/fail2ban-prometheus-exporter/auth"
+)
+
+var cliStruct struct {
+	VersionMode          bool   `name:"version" short:"v" help:"Show version info and exit"`
+	DryRunMode           bool   `name:"dry-run" help:"Attempt to connect to the fail2ban socket then exit before starting the server"`
+	ServerAddress        string `name:"web.listen-address" env:"F2B_WEB_LISTEN_ADDRESS" help:"Address to use for the metrics server" default:"${default_address}"`
+	F2bSocketPath        string `name:"collector.f2b.socket" env:"F2B_COLLECTOR_SOCKET" help:"Path to the fail2ban server socket" default:"${default_socket}"`
+	ExitOnSocketError    bool   `name:"collector.f2b.exit-on-socket-connection-error" env:"F2B_EXIT_ON_SOCKET_CONN_ERROR" help:"When set to true the exporter will immediately exit on a fail2ban socket connection error"`
+	TextFileExporterPath string `name:"collector.textfile.directory" env:"F2B_COLLECTOR_TEXT_PATH" help:"Directory to read text files with metrics from"`
+	BasicAuthUser        string `name:"web.basic-auth.username" env:"F2B_WEB_BASICAUTH_USER" help:"Username to use to protect endpoints with basic auth"`
+	BasicAuthPass        string `name:"web.basic-auth.password" env:"F2B_WEB_BASICAUTH_PASS" help:"Password to use to protect endpoints with basic auth"`
+}
+
+func Parse() *AppSettings {
+	ctx := kong.Parse(
+		&cliStruct,
+		kong.Vars{
+			"default_socket":  "/var/run/fail2ban/fail2ban.sock",
+			"default_address": ":9191",
+		},
+		kong.Name("fail2ban_exporter"),
+		kong.Description("🚀 Export prometheus metrics from a running Fail2Ban instance"),
+		kong.UsageOnError(),
+	)
+
+	validateFlags(ctx)
+	settings := &AppSettings{
+		VersionMode:           cliStruct.VersionMode,
+		DryRunMode:            cliStruct.DryRunMode,
+		MetricsAddress:        cliStruct.ServerAddress,
+		Fail2BanSocketPath:    cliStruct.F2bSocketPath,
+		FileCollectorPath:     cliStruct.TextFileExporterPath,
+		ExitOnSocketConnError: cliStruct.ExitOnSocketError,
+		AuthProvider:          createAuthProvider(),
+	}
+	return settings
+}
+
+func createAuthProvider() auth.AuthProvider {
+	username := cliStruct.BasicAuthUser
+	password := cliStruct.BasicAuthPass
+
+	if len(username) == 0 && len(password) == 0 {
+		return auth.NewEmptyAuthProvider()
+	}
+	log.Print("basic auth enabled")
+	return auth.NewBasicAuthProvider(username, password)
+}
+
+func validateFlags(cliCtx *kong.Context) {
+	var flagsValid = true
+	var messages = []string{}
+	if !cliStruct.VersionMode {
+		if cliStruct.F2bSocketPath == "" {
+			messages = append(messages, "error: fail2ban socket path must not be blank")
+			flagsValid = false
+		}
+		if cliStruct.ServerAddress == "" {
+			messages = append(messages, "error: invalid server address, must not be blank")
+			flagsValid = false
+		}
+		if (len(cliStruct.BasicAuthUser) > 0) != (len(cliStruct.BasicAuthPass) > 0) {
+			messages = append(messages, "error: to enable basic auth both the username and the password must be provided")
+			flagsValid = false
+		}
+	}
+	if !flagsValid {
+		cliCtx.PrintUsage(false)
+		fmt.Println()
+		for i := 0; i < len(messages); i++ {
+			fmt.Println(messages[i])
+		}
+		os.Exit(1)
+	}
+}

cfg/settings.go

@@ -0,0 +1,13 @@
+package cfg
+
+import "gitlab.com/hectorjsmith/fail2ban-prometheus-exporter/auth"
+
+type AppSettings struct {
+	VersionMode           bool
+	DryRunMode            bool
+	MetricsAddress        string
+	Fail2BanSocketPath    string
+	FileCollectorPath     string
+	AuthProvider          auth.AuthProvider
+	ExitOnSocketConnError bool
+}

collector/f2b/collector.go

@@ -1,29 +1,33 @@
 package f2b
 
 import (
-	"fail2ban-prometheus-exporter/cfg"
-	"fail2ban-prometheus-exporter/socket"
-	"github.com/prometheus/client_golang/prometheus"
 	"log"
+	"os"
+
+	"github.com/prometheus/client_golang/prometheus"
+	"gitlab.com/hectorjsmith/fail2ban-prometheus-exporter/cfg"
+	"gitlab.com/hectorjsmith/fail2ban-prometheus-exporter/socket"
 )
 
 type Collector struct {
 	socketPath                 string
 	exporterVersion            string
 	lastError                  error
-	dbErrorCount               int
 	socketConnectionErrorCount int
 	socketRequestErrorCount    int
+	exitOnSocketConnError      bool
 }
 
 func NewExporter(appSettings *cfg.AppSettings, exporterVersion string) *Collector {
+	log.Printf("reading fail2ban metrics from socket file: %s", appSettings.Fail2BanSocketPath)
+	printFail2BanServerVersion(appSettings.Fail2BanSocketPath)
 	return &Collector{
 		socketPath:                 appSettings.Fail2BanSocketPath,
 		exporterVersion:            exporterVersion,
 		lastError:                  nil,
-		dbErrorCount:               0,
 		socketConnectionErrorCount: 0,
 		socketRequestErrorCount:    0,
+		exitOnSocketConnError:      appSettings.ExitOnSocketConnError,
 	}
 }
 
@@ -42,6 +46,9 @@ func (c *Collector) Collect(ch chan<- prometheus.Metric) {
 	if err != nil {
 		log.Printf("error opening socket: %v", err)
 		c.socketConnectionErrorCount++
+		if c.exitOnSocketConnError {
+			os.Exit(1)
+		}
 	} else {
 		defer s.Close()
 	}
@@ -53,3 +60,33 @@ func (c *Collector) Collect(ch chan<- prometheus.Metric) {
 	}
 	c.collectErrorCountMetric(ch)
 }
+
+func (c *Collector) IsHealthy() bool {
+	s, err := socket.ConnectToSocket(c.socketPath)
+	if err != nil {
+		log.Printf("error opening socket: %v", err)
+		c.socketConnectionErrorCount++
+		return false
+	}
+	pingSuccess, err := s.Ping()
+	if err != nil {
+		log.Printf("error pinging fail2ban server: %v", err)
+		c.socketRequestErrorCount++
+		return false
+	}
+	return pingSuccess
+}
+
+func printFail2BanServerVersion(socketPath string) {
+	s, err := socket.ConnectToSocket(socketPath)
+	if err != nil {
+		log.Printf("error connecting to socket: %v", err)
+	} else {
+		version, err := s.GetServerVersion()
+		if err != nil {
+			log.Printf("error interacting with socket: %v", err)
+		} else {
+			log.Printf("successfully connected to fail2ban socket! fail2ban version: %s", version)
+		}
+	}
+}

collector/f2b/socket.go

@@ -1,8 +1,8 @@
 package f2b
 
 import (
-	"fail2ban-prometheus-exporter/socket"
 	"github.com/prometheus/client_golang/prometheus"
+	"gitlab.com/hectorjsmith/fail2ban-prometheus-exporter/socket"
 	"log"
 )
 
@@ -69,9 +69,6 @@ var (
 )
 
 func (c *Collector) collectErrorCountMetric(ch chan<- prometheus.Metric) {
-	ch <- prometheus.MustNewConstMetric(
-		metricErrorCount, prometheus.CounterValue, float64(c.dbErrorCount), "db",
-	)
 	ch <- prometheus.MustNewConstMetric(
 		metricErrorCount, prometheus.CounterValue, float64(c.socketConnectionErrorCount), "socket_conn",
 	)

collector/textfile/collector.go

@@ -1,8 +1,8 @@
 package textfile
 
 import (
-	"fail2ban-prometheus-exporter/cfg"
 	"github.com/prometheus/client_golang/prometheus"
+	"gitlab.com/hectorjsmith/fail2ban-prometheus-exporter/cfg"
 	"log"
 )
 
@@ -20,12 +20,12 @@ type fileData struct {
 
 func NewCollector(appSettings *cfg.AppSettings) *Collector {
 	collector := &Collector{
-		enabled:    appSettings.FileCollectorEnabled,
+		enabled:    appSettings.FileCollectorPath != "",
 		folderPath: appSettings.FileCollectorPath,
 		fileMap:    make(map[string]*fileData),
 	}
 	if collector.enabled {
-		log.Printf("collector.textfile directory: %s", collector.folderPath)
+		log.Printf("reading textfile metrics from: %s", collector.folderPath)
 	}
 	return collector
 }

collector/textfile/file.go

@@ -1,11 +1,12 @@
 package textfile
 
 import (
-	"github.com/prometheus/client_golang/prometheus"
-	"io/ioutil"
 	"log"
+	"os"
 	"path/filepath"
 	"strings"
+
+	"github.com/prometheus/client_golang/prometheus"
 )
 
 const namespace = "textfile"
@@ -19,7 +20,7 @@ var (
 )
 
 func (c *Collector) collectFileContents() {
-	files, err := ioutil.ReadDir(c.folderPath)
+	files, err := os.ReadDir(c.folderPath)
 	if err != nil {
 		log.Printf("error reading directory '%s': %v", c.folderPath, err)
 		return
@@ -36,7 +37,7 @@ func (c *Collector) collectFileContents() {
 		}
 
 		fullPath := filepath.Join(c.folderPath, fileName)
-		content, err := ioutil.ReadFile(fullPath)
+		content, err := os.ReadFile(fullPath)
 		if err != nil {
 			c.appendErrorForPath(fileName)
 			log.Printf("error reading contents of file '%s': %v", fileName, err)

docker/run.sh

@@ -1,20 +0,0 @@
-#/bin/sh
-
-# Print version to logs for debugging purposes
-/app/fail2ban-prometheus-exporter -version
-
-socket_path=/var/run/fail2ban/fail2ban.sock
-textfile_dir=/app/textfile/
-textfile_enabled=false
-
-# Enable textfile metrics if the folder exists (i.e. was mounted by docker)
-if [ -d $textfile_dir ]; then
-    textfile_enabled=true
-fi
-
-# Start the exporter (use exec to support graceful shutdown)
-# Inspired by: https://akomljen.com/stopping-docker-containers-gracefully/
-exec /app/fail2ban-prometheus-exporter \
-    -socket "$socket_path" \
-    -collector.textfile=$textfile_enabled \
-    -collector.textfile.directory="$textfile_dir"

exporter.go

@@ -0,0 +1,66 @@
+package main
+
+import (
+	"fmt"
+	"log"
+	"os"
+	"os/signal"
+	"syscall"
+
+	"github.com/prometheus/client_golang/prometheus"
+	"gitlab.com/hectorjsmith/fail2ban-prometheus-exporter/cfg"
+	"gitlab.com/hectorjsmith/fail2ban-prometheus-exporter/collector/f2b"
+	"gitlab.com/hectorjsmith/fail2ban-prometheus-exporter/collector/textfile"
+	"gitlab.com/hectorjsmith/fail2ban-prometheus-exporter/server"
+)
+
+var (
+	version = "dev"
+	commit  = "none"
+	date    = "unknown"
+	builtBy = "unknown"
+)
+
+func printAppVersion() {
+	fmt.Println(version)
+	fmt.Printf("    build date:  %s\r\n    commit hash: %s\r\n    built by:    %s\r\n", date, commit, builtBy)
+}
+
+func main() {
+	appSettings := cfg.Parse()
+	if appSettings.VersionMode {
+		printAppVersion()
+		return
+	}
+
+	handleGracefulShutdown()
+	log.Printf("fail2ban exporter version %s", version)
+	log.Printf("starting server at %s", appSettings.MetricsAddress)
+
+	f2bCollector := f2b.NewExporter(appSettings, version)
+	prometheus.MustRegister(f2bCollector)
+
+	textFileCollector := textfile.NewCollector(appSettings)
+	prometheus.MustRegister(textFileCollector)
+
+	if !appSettings.DryRunMode {
+		svrErr := server.StartServer(appSettings, f2bCollector, textFileCollector)
+		err := <-svrErr
+		log.Fatal(err)
+	} else {
+		log.Print("running in dry-run mode - exiting")
+	}
+}
+
+func handleGracefulShutdown() {
+	var signals = make(chan os.Signal, 1)
+
+	signal.Notify(signals, syscall.SIGTERM)
+	signal.Notify(signals, syscall.SIGINT)
+
+	go func() {
+		sig := <-signals
+		log.Printf("caught signal: %+v", sig)
+		os.Exit(0)
+	}()
+}

go.mod

@@ -0,0 +1,21 @@
+module gitlab.com/hectorjsmith/fail2ban-prometheus-exporter
+
+go 1.20
+
+require (
+	github.com/alecthomas/kong v0.8.1
+	github.com/kisielk/og-rek v1.2.0
+	github.com/nlpodyssey/gopickle v0.2.0
+	github.com/prometheus/client_golang v1.17.0
+)
+
+require (
+	github.com/beorn7/perks v1.0.1 // indirect
+	github.com/cespare/xxhash/v2 v2.2.0 // indirect
+	github.com/matttproud/golang_protobuf_extensions/v2 v2.0.0 // indirect
+	github.com/prometheus/client_model v0.5.0 // indirect
+	github.com/prometheus/common v0.45.0 // indirect
+	github.com/prometheus/procfs v0.12.0 // indirect
+	golang.org/x/sys v0.13.0 // indirect
+	google.golang.org/protobuf v1.31.0 // indirect
+)

go.sum

@@ -0,0 +1,33 @@
+github.com/alecthomas/assert/v2 v2.1.0 h1:tbredtNcQnoSd3QBhQWI7QZ3XHOVkw1Moklp2ojoH/0=
+github.com/alecthomas/kong v0.8.1 h1:acZdn3m4lLRobeh3Zi2S2EpnXTd1mOL6U7xVml+vfkY=
+github.com/alecthomas/kong v0.8.1/go.mod h1:n1iCIO2xS46oE8ZfYCNDqdR0b0wZNrXAIAqro/2132U=
+github.com/alecthomas/repr v0.1.0 h1:ENn2e1+J3k09gyj2shc0dHr/yjaWSHRlrJ4DPMevDqE=
+github.com/beorn7/perks v1.0.1 h1:VlbKKnNfV8bJzeqoa4cOKqO6bYr3WgKZxO8Z16+hsOM=
+github.com/beorn7/perks v1.0.1/go.mod h1:G2ZrVWU2WbWT9wwq4/hrbKbnv/1ERSJQ0ibhJ6rlkpw=
+github.com/cespare/xxhash/v2 v2.2.0 h1:DC2CZ1Ep5Y4k3ZQ899DldepgrayRUGE6BBZ/cd9Cj44=
+github.com/cespare/xxhash/v2 v2.2.0/go.mod h1:VGX0DQ3Q6kWi7AoAeZDth3/j3BFtOZR5XLFGgcrjCOs=
+github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
+github.com/golang/protobuf v1.5.0/go.mod h1:FsONVRAS9T7sI+LIUmWTfcYkHO4aIWwzhcaSAoJOfIk=
+github.com/google/go-cmp v0.5.5/go.mod h1:v8dTdLbMG2kIc/vJvl+f65V22dbkXbowE6jgT/gNBxE=
+github.com/google/go-cmp v0.5.9 h1:O2Tfq5qg4qc4AmwVlvv0oLiVAGB7enBSJ2x2DqQFi38=
+github.com/hexops/gotextdiff v1.0.3 h1:gitA9+qJrrTCsiCl7+kh75nPqQt1cx4ZkudSTLoUqJM=
+github.com/kisielk/og-rek v1.2.0 h1:CTvDIin+YnetsSQAYbe+QNAxXU3B50C5hseEz8xEoJw=
+github.com/kisielk/og-rek v1.2.0/go.mod h1:6ihsOSzSAxR/65S3Bn9zNihoEqRquhDQZ2c6I2+MG3c=
+github.com/matttproud/golang_protobuf_extensions/v2 v2.0.0 h1:jWpvCLoY8Z/e3VKvlsiIGKtc+UG6U5vzxaoagmhXfyg=
+github.com/matttproud/golang_protobuf_extensions/v2 v2.0.0/go.mod h1:QUyp042oQthUoa9bqDv0ER0wrtXnBruoNd7aNjkbP+k=
+github.com/nlpodyssey/gopickle v0.2.0 h1:4naD2DVylYJupQLbCQFdwo6yiXEmPyp+0xf5MVlrBDY=
+github.com/nlpodyssey/gopickle v0.2.0/go.mod h1:YIUwjJ2O7+vnBsxUN+MHAAI3N+adqEGiw+nDpwW95bY=
+github.com/prometheus/client_golang v1.17.0 h1:rl2sfwZMtSthVU752MqfjQozy7blglC+1SOtjMAMh+Q=
+github.com/prometheus/client_golang v1.17.0/go.mod h1:VeL+gMmOAxkS2IqfCq0ZmHSL+LjWfWDUmp1mBz9JgUY=
+github.com/prometheus/client_model v0.5.0 h1:VQw1hfvPvk3Uv6Qf29VrPF32JB6rtbgI6cYPYQjL0Qw=
+github.com/prometheus/client_model v0.5.0/go.mod h1:dTiFglRmd66nLR9Pv9f0mZi7B7fk5Pm3gvsjB5tr+kI=
+github.com/prometheus/common v0.45.0 h1:2BGz0eBc2hdMDLnO/8n0jeB3oPrt2D08CekT0lneoxM=
+github.com/prometheus/common v0.45.0/go.mod h1:YJmSTw9BoKxJplESWWxlbyttQR4uaEcGyv9MZjVOJsY=
+github.com/prometheus/procfs v0.12.0 h1:jluTpSng7V9hY0O2R9DzzJHYb2xULk9VTR1V1R/k6Bo=
+github.com/prometheus/procfs v0.12.0/go.mod h1:pcuDEFsWDnvcgNzo4EEweacyhjeA9Zk3cnaOZAZEfOo=
+golang.org/x/sys v0.13.0 h1:Af8nKPmuFypiUBjVoU9V20FiaFXOcuZI21p0ycVYYGE=
+golang.org/x/sys v0.13.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
+golang.org/x/xerrors v0.0.0-20191204190536-9bdfabe68543/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
+google.golang.org/protobuf v1.26.0-rc.1/go.mod h1:jlhhOSvTdKEhbULTjvd4ARK9grFBp09yW+WbY/TyQbw=
+google.golang.org/protobuf v1.31.0 h1:g0LDEJHgrBl9N9r17Ru3sqWhkIx2NB67okBHPwC7hs8=
+google.golang.org/protobuf v1.31.0/go.mod h1:HV8QOd/L58Z+nl8r43ehVNZIU/HEI6OcFqwMG9pJV4I=

health

@@ -0,0 +1,8 @@
+#!/bin/sh
+
+port=9191
+if [ ! -z $F2B_WEB_LISTEN_ADDRESS ]; then
+    port=`echo $F2B_WEB_LISTEN_ADDRESS | cut -d ":" -f 2 -`
+fi
+
+curl --fail localhost:$port/health || exit 1

server/auth.go

@@ -0,0 +1,17 @@
+package server
+
+import (
+	"net/http"
+
+	"gitlab.com/hectorjsmith/fail2ban-prometheus-exporter/auth"
+)
+
+func AuthMiddleware(handlerFunc http.HandlerFunc, authProvider auth.AuthProvider) http.HandlerFunc {
+	return func(w http.ResponseWriter, r *http.Request) {
+		if authProvider.IsAllowed(r) {
+			handlerFunc.ServeHTTP(w, r)
+		} else {
+			w.WriteHeader(http.StatusUnauthorized)
+		}
+	}
+}

server/auth_test.go

@@ -0,0 +1,46 @@
+package server
+
+import (
+	"net/http"
+	"net/http/httptest"
+	"testing"
+)
+
+type testAuthProvider struct {
+	match bool
+}
+
+func (p testAuthProvider) IsAllowed(request *http.Request) bool {
+	return p.match
+}
+
+func newTestRequest() *http.Request {
+	return httptest.NewRequest(http.MethodGet, "http://example.com", nil)
+}
+
+func executeAuthMiddlewareTest(t *testing.T, authMatches bool, expectedCode int, expectedCallCount int) {
+	callCount := 0
+	testHandler := func(w http.ResponseWriter, r *http.Request) {
+		callCount++
+	}
+
+	handler := AuthMiddleware(testHandler, testAuthProvider{match: authMatches})
+	recorder := httptest.NewRecorder()
+	request := newTestRequest()
+	handler.ServeHTTP(recorder, request)
+
+	if recorder.Code != expectedCode {
+		t.Errorf("statusCode = %v, want %v", recorder.Code, expectedCode)
+	}
+	if callCount != expectedCallCount {
+		t.Errorf("callCount = %v, want %v", callCount, expectedCallCount)
+	}
+}
+
+func Test_GIVEN_MatchingBasicAuth_WHEN_MethodCalled_THEN_RequestProcessed(t *testing.T) {
+	executeAuthMiddlewareTest(t, true, http.StatusOK, 1)
+}
+
+func Test_GIVEN_NonMatchingBasicAuth_WHEN_MethodCalled_THEN_RequestRejected(t *testing.T) {
+	executeAuthMiddlewareTest(t, false, http.StatusUnauthorized, 0)
+}

server/handler.go

@@ -0,0 +1,44 @@
+package server
+
+import (
+	"log"
+	"net/http"
+
+	"github.com/prometheus/client_golang/prometheus/promhttp"
+	"gitlab.com/hectorjsmith/fail2ban-prometheus-exporter/collector/f2b"
+	"gitlab.com/hectorjsmith/fail2ban-prometheus-exporter/collector/textfile"
+)
+
+const (
+	metricsPath = "/metrics"
+)
+
+func rootHtmlHandler(w http.ResponseWriter, r *http.Request) {
+	_, err := w.Write([]byte(
+		`<html>
+			<head><title>Fail2Ban Exporter</title></head>
+			<body>
+			<h1>Fail2Ban Exporter</h1>
+			<p><a href="` + metricsPath + `">Metrics</a></p>
+			</body>
+		</html>`))
+	if err != nil {
+		log.Printf("error handling root url: %v", err)
+		w.WriteHeader(http.StatusInternalServerError)
+	}
+}
+
+func metricHandler(w http.ResponseWriter, r *http.Request, collector *textfile.Collector) {
+	promhttp.Handler().ServeHTTP(w, r)
+	collector.WriteTextFileMetrics(w, r)
+}
+
+func healthHandler(w http.ResponseWriter, r *http.Request, collector *f2b.Collector) {
+	if collector.IsHealthy() {
+		w.WriteHeader(http.StatusOK)
+		w.Write([]byte("{\"healthy\":true}"))
+	} else {
+		w.WriteHeader(http.StatusInternalServerError)
+		w.Write([]byte("{\"healthy\":false}"))
+	}
+}

server/server.go

@@ -0,0 +1,48 @@
+package server
+
+import (
+	"log"
+	"net/http"
+	"time"
+
+	"gitlab.com/hectorjsmith/fail2ban-prometheus-exporter/cfg"
+	"gitlab.com/hectorjsmith/fail2ban-prometheus-exporter/collector/f2b"
+	"gitlab.com/hectorjsmith/fail2ban-prometheus-exporter/collector/textfile"
+)
+
+func StartServer(
+	appSettings *cfg.AppSettings,
+	f2bCollector *f2b.Collector,
+	textFileCollector *textfile.Collector,
+) chan error {
+	http.HandleFunc("/", AuthMiddleware(
+		rootHtmlHandler,
+		appSettings.AuthProvider,
+	))
+	http.HandleFunc(metricsPath, AuthMiddleware(
+		func(w http.ResponseWriter, r *http.Request) {
+			metricHandler(w, r, textFileCollector)
+		},
+		appSettings.AuthProvider,
+	))
+	http.HandleFunc("/health",
+		func(w http.ResponseWriter, r *http.Request) {
+			healthHandler(w, r, f2bCollector)
+		},
+	)
+	log.Printf("metrics available at '%s'", metricsPath)
+
+	svrErr := make(chan error)
+	go func() {
+		httpServer := &http.Server{
+			Addr:              appSettings.MetricsAddress,
+			ReadHeaderTimeout: 10 * time.Second,
+			ReadTimeout:       10 * time.Second,
+			WriteTimeout:      10 * time.Second,
+			IdleTimeout:       30 * time.Second,
+		}
+		svrErr <- httpServer.ListenAndServe()
+	}()
+	log.Print("ready")
+	return svrErr
+}

socket/protocol.go

@@ -59,7 +59,7 @@ func (s *Fail2BanSocket) read() (interface{}, error) {
 	unpickler := pickle.NewUnpickler(bufReader)
 
 	unpickler.FindClass = func(module, name string) (interface{}, error) {
-		if module == "builtins" && name == "str" {
+		if (module == "builtins" || module == "__builtin__") && name == "str" {
 			return &Py_builtins_str{}, nil
 		}
 		return nil, fmt.Errorf("class not found: " + module + " : " + name)

src/cfg/cfg.go

@@ -1,59 +0,0 @@
-package cfg
-
-import (
-	"flag"
-	"fmt"
-	"os"
-)
-
-const (
-	minServerPort = 1000
-	maxServerPort = 65535
-)
-
-type AppSettings struct {
-	VersionMode          bool
-	MetricsPort          int
-	Fail2BanSocketPath   string
-	FileCollectorPath    string
-	FileCollectorEnabled bool
-}
-
-func Parse() *AppSettings {
-	appSettings := &AppSettings{}
-	flag.BoolVar(&appSettings.VersionMode, "version", false, "show version info and exit")
-	flag.IntVar(&appSettings.MetricsPort, "port", 9191, "port to use for the metrics server")
-	flag.StringVar(&appSettings.Fail2BanSocketPath, "socket", "", "path to the fail2ban server socket")
-	flag.BoolVar(&appSettings.FileCollectorEnabled, "collector.textfile", false, "enable the textfile collector")
-	flag.StringVar(&appSettings.FileCollectorPath, "collector.textfile.directory", "", "directory to read text files with metrics from")
-
-	// deprecated: to be removed in next version
-	_ = flag.String("db", "", "path to the fail2ban sqlite database (removed)")
-
-	flag.Parse()
-	appSettings.validateFlags()
-	return appSettings
-}
-
-func (settings *AppSettings) validateFlags() {
-	var flagsValid = true
-	if !settings.VersionMode {
-		if settings.Fail2BanSocketPath == "" {
-			fmt.Println("fail2ban socket path must not be blank")
-			flagsValid = false
-		}
-		if settings.MetricsPort < minServerPort || settings.MetricsPort > maxServerPort {
-			fmt.Printf("invalid server port, must be within %d and %d (found %d)\n",
-				minServerPort, maxServerPort, settings.MetricsPort)
-			flagsValid = false
-		}
-		if settings.FileCollectorEnabled && settings.FileCollectorPath == "" {
-			fmt.Printf("file collector directory path must not be empty if collector enabled\n")
-			flagsValid = false
-		}
-	}
-	if !flagsValid {
-		flag.Usage()
-		os.Exit(1)
-	}
-}

src/exporter.go

@@ -1,81 +0,0 @@
-package main
-
-import (
-	"fail2ban-prometheus-exporter/cfg"
-	"fail2ban-prometheus-exporter/collector/f2b"
-	"fail2ban-prometheus-exporter/collector/textfile"
-	"fmt"
-	"log"
-	"net/http"
-
-	"github.com/prometheus/client_golang/prometheus"
-	"github.com/prometheus/client_golang/prometheus/promhttp"
-)
-
-const (
-	metricsPath = "/metrics"
-)
-
-var (
-	version = "dev"
-	commit  = "none"
-	date    = "unknown"
-	builtBy = "unknown"
-)
-
-func printAppVersion() {
-	fmt.Println(version)
-	fmt.Printf("    build date:  %s\r\n    commit hash: %s\r\n    built by:    %s\r\n", date, commit, builtBy)
-}
-
-func rootHtmlHandler(w http.ResponseWriter, r *http.Request) {
-	_, err := w.Write([]byte(
-		`<html>
-			<head><title>Fail2Ban Exporter</title></head>
-			<body>
-			<h1>Fail2Ban Exporter</h1>
-			<p><a href="` + metricsPath + `">Metrics</a></p>
-			</body>
-		</html>`))
-	if err != nil {
-		log.Printf("error handling root url: %v", err)
-		w.WriteHeader(http.StatusInternalServerError)
-	}
-}
-
-func metricHandler(w http.ResponseWriter, r *http.Request, collector *textfile.Collector) {
-	promhttp.Handler().ServeHTTP(w, r)
-	collector.WriteTextFileMetrics(w, r)
-}
-
-func main() {
-	appSettings := cfg.Parse()
-	if appSettings.VersionMode {
-		printAppVersion()
-	} else {
-		addr := fmt.Sprintf("0.0.0.0:%d", appSettings.MetricsPort)
-
-		log.Printf("starting fail2ban exporter at %s", addr)
-
-		f2bCollector := f2b.NewExporter(appSettings, version)
-		prometheus.MustRegister(f2bCollector)
-
-		textFileCollector := textfile.NewCollector(appSettings)
-		prometheus.MustRegister(textFileCollector)
-
-		http.HandleFunc("/", rootHtmlHandler)
-		http.HandleFunc(metricsPath, func(w http.ResponseWriter, r *http.Request) {
-			metricHandler(w, r, textFileCollector)
-		})
-		log.Printf("metrics available at '%s'", metricsPath)
-
-		svrErr := make(chan error)
-		go func() {
-			svrErr <- http.ListenAndServe(addr, nil)
-		}()
-		log.Print("ready")
-
-		err := <-svrErr
-		log.Print(err)
-	}
-}

src/go.mod

@@ -1,9 +0,0 @@
-module fail2ban-prometheus-exporter
-
-go 1.15
-
-require (
-	github.com/kisielk/og-rek v1.1.0
-	github.com/nlpodyssey/gopickle v0.1.0
-	github.com/prometheus/client_golang v1.9.0
-)

src/go.sum

@@ -1,404 +0,0 @@
-cloud.google.com/go v0.26.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw=
-cloud.google.com/go v0.34.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw=
-github.com/BurntSushi/toml v0.3.1/go.mod h1:xHWCNGjB5oqiDr8zfno3MHue2Ht5sIBksp03qcyfWMU=
-github.com/Knetic/govaluate v3.0.1-0.20171022003610-9aa49832a739+incompatible/go.mod h1:r7JcOSlj0wfOMncg0iLm8Leh48TZaKVeNIfJntJ2wa0=
-github.com/Shopify/sarama v1.19.0/go.mod h1:FVkBWblsNy7DGZRfXLU0O9RCGt5g3g3yEuWXgklEdEo=
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tools/chglog/CHANGELOG.tpl.md

@@ -1,60 +0,0 @@
-# CHANGELOG
-
-All notable changes to this project will be documented in this file.
-
-The format is based on [Keep a Changelog], and this project adheres to [Semantic Versioning].
-
-{{ if .Versions -}}
-## [Unreleased]
-{{- if .Unreleased.CommitGroups }}
-{{ template "commits" .Unreleased.CommitGroups }}
-{{- end -}}
-
-{{- if .Unreleased.NoteGroups -}}
-{{ template "notes" .Unreleased.NoteGroups }}
-{{- end -}}
-{{- end -}}
-
-{{ range .Versions -}}
-## {{ if .Tag.Previous }}[{{ .Tag.Name }}]{{ else }}{{ .Tag.Name }}{{ end }} - {{ datetime "2006-01-02" .Tag.Date }}
-{{ template "commits" .CommitGroups }}
-{{- if .NoteGroups -}}
-{{ template "notes" .NoteGroups }}
-{{- end -}}
-{{ end }}
----
-
-*This changelog is automatically generated by [git-chglog]*
-
-[Keep a Changelog]: https://keepachangelog.com/en/1.0.0/
-[Semantic Versioning]: https://semver.org/spec/v2.0.0.html
-[git-chglog]: https://github.com/git-chglog/git-chglog
-
-{{- if .Versions }}
-[Unreleased]: {{ .Info.RepositoryURL }}/compare/{{ $latest := index .Versions 0 }}{{ $latest.Tag.Name }}...main
-{{ range .Versions -}}
-{{ if .Tag.Previous -}}
-[{{ .Tag.Name }}]: {{ $.Info.RepositoryURL }}/compare/{{ .Tag.Previous.Name }}...{{ .Tag.Name }}
-{{ end -}}
-{{ end -}}
-{{ end -}}
-
-{{- define "notes" }}
-{{- range . -}}
-### {{ .Title }}
-{{ range .Notes -}}
-- {{ .Body }}
-{{ end }}
-{{ end }}
-{{ end -}}
-
-{{- define "commits" }}
-{{- range . -}}
-{{ if or (eq .RawTitle "feat") (eq .RawTitle "fix") }}
-### {{ .Title }}
-{{ range .Commits -}}
-- ({{ .Hash.Short }}) {{ if .Scope }}**{{ .Scope }}:** {{ end }}{{ .Header }}
-{{ end }}
-{{ end -}}
-{{ end -}}
-{{ end -}}

tools/chglog/config.yml

@@ -1,23 +0,0 @@
-style: gitlab
-template: CHANGELOG.tpl.md
-info:
-  title: CHANGELOG
-  repository_url: https://gitlab.com/hectorjsmith/fail2ban-prometheus-exporter
-options:
-  commit_groups:
-    title_maps:
-      feat: Added
-      fix: Fixed
-      revert: Reverted
-  header:
-    pattern: "^(\\w*)\\:\\s(.*)$"
-    pattern_maps:
-      - Type
-      - Subject
-  notes:
-    keywords:
-      - BREAKING CHANGE
-      - Changed
-      - Deprecated
-      - Removed
-      - Security