Refactor config and get rid of some dependencies

Dockerfile

@@ -1,5 +1,5 @@
 # Builder image
-FROM golang:1.23.4 as builder
+FROM golang:1.23.4 AS builder
 WORKDIR /workspace
 
 ENV GO111MODULE=on

README.md

@@ -1,64 +1,48 @@
-# IPsec Prometheus Exporter
+# IPSec Prometheus Exporter
 
-_The IPsec Prometheus exporter subscribes to the strongSwan via Vici API and exposes [Security Associations](https://github.com/strongswan/strongswan/blob/master/src/libcharon/plugins/vici/README.md#list-sa) (SAs) metrics._
+_The IPSec Prometheus exporter subscribes to the strongSwan via Vici API and exposes [Security Associations](https://github.com/strongswan/strongswan/blob/master/src/libcharon/plugins/vici/README.md#list-sa) (SAs) metrics._
 
 Collected metrics (together with application metrics) are exposed on `/metrics` endpoint. Prometheus target is then configured with this endpoint and port e.g. `http://localhost:8079/metrics`.
 
 ## Configuration
 
-IPsec Prometheus exporter configuration yaml file is optional. If not provided, the default values are used.
+IPSec Prometheus exporter is configured via command-line arguments. If not provided, the default values are used.
 
-### Config file
+### Command-line arguments
 
 If the default value match with your choice you can omit it.
 
-```yaml
-# Logger configuration
-logging:
-  # logging level - default: INFO
-  level: DEBUG
-
-# HTTP server configuration
-server:
-  # server port - default: 8079
-  port: 8080
-
-# Vici configuration
-vici:
-  # Vici network scheme - default: tcp
-  network: "udp"
-  # Vici host is the ip-address or hostname.
-  # Default values for hostname is "localhost".
-  # IPv6 is supported. Use host in format of "[fd12:3456:789a::1]".
-  host: "127.0.0.1"
-  # Vici port - default: 4502
-  port: 30123
+```
+Options and default values:
+--server-port=8079              Application port where the collected metrics are available
+--log-level=info                Logging level (debug, info, warn, error)
+--vici-network=tcp              Vici network scheme (tcp, udp, unix)
+--vici-address=localhost:4502   IP address or hostname with a port or unix socket path
+                                IPv6 is supported. Use address in format of "[fd12:3456:789a::1]:4502"
 ```
 
 ## Value Definition
 
-
-
-| Metric | Value | Description |
-|--------|-------|-------------|
-| strongswan_*_status | 0 | The tunnel is installed and is up and running. |
-| strongswan_*_status | 1 | The connection is established. |
-| strongswan_*_status | 2 | The tunnel or connection is down. |
-| strongswan_*_status | 3 | The tunnel or connection status is not recognized. |
+| Metric              | Value | Description                                        |
+|---------------------|-------|----------------------------------------------------|
+| strongswan_*_status | 0     | The tunnel is installed and is up and running.     |
+| strongswan_*_status | 1     | The connection is established.                     |
+| strongswan_*_status | 2     | The tunnel or connection is down.                  |
+| strongswan_*_status | 3     | The tunnel or connection status is not recognized. |
 
 ## Build & Run
 To build the binary run:
 ```bash
 make build
 ```
 
-Run the binary with optional `config` parameter provided:
+Run the binary with optional arguments provided:
 ```bash
-./ipsec-prometheus-exporter [--config=<path to yaml config file>]
+./ipsec-prometheus-exporter [--server-port=8079] [--log-level=info] [--vici-network=tcp] [--vici-address=localhost:4502]
 ```
 
 ## Docker image
 Public docker image is available for multiple platforms: https://hub.docker.com/r/torilabs/ipsec-prometheus-exporter
 ```
-docker run -it -p 8079:8079 -v $(pwd)/my-config.yaml:/config.yaml --rm torilabs/ipsec-prometheus-exporter:latest
+docker run -it -p 8079:8079 --rm torilabs/ipsec-prometheus-exporter:latest --server-port=8079
 ```

go.mod

@@ -8,8 +8,6 @@ require (
 	github.com/etherlabsio/healthcheck/v2 v2.0.0
 	github.com/pkg/errors v0.9.1
 	github.com/prometheus/client_golang v1.20.5
-	github.com/spf13/cobra v1.8.1
-	github.com/spf13/viper v1.19.0
 	github.com/stretchr/testify v1.10.0
 	github.com/strongswan/govici v0.7.0
 	go.uber.org/zap v1.27.0
@@ -19,31 +17,15 @@ require (
 	github.com/beorn7/perks v1.0.1 // indirect
 	github.com/cespare/xxhash/v2 v2.3.0 // indirect
 	github.com/davecgh/go-spew v1.1.2-0.20180830191138-d8f796af33cc // indirect
-	github.com/fsnotify/fsnotify v1.7.0 // indirect
-	github.com/hashicorp/hcl v1.0.0 // indirect
-	github.com/inconshreveable/mousetrap v1.1.0 // indirect
 	github.com/klauspost/compress v1.17.9 // indirect
 	github.com/kylelemons/godebug v1.1.0 // indirect
-	github.com/magiconair/properties v1.8.7 // indirect
-	github.com/mitchellh/mapstructure v1.5.0 // indirect
 	github.com/munnerz/goautoneg v0.0.0-20191010083416-a7dc8b61c822 // indirect
-	github.com/pelletier/go-toml/v2 v2.2.2 // indirect
 	github.com/pmezard/go-difflib v1.0.1-0.20181226105442-5d4384ee4fb2 // indirect
 	github.com/prometheus/client_model v0.6.1 // indirect
 	github.com/prometheus/common v0.55.0 // indirect
 	github.com/prometheus/procfs v0.15.1 // indirect
-	github.com/sagikazarmark/locafero v0.4.0 // indirect
-	github.com/sagikazarmark/slog-shim v0.1.0 // indirect
-	github.com/sourcegraph/conc v0.3.0 // indirect
-	github.com/spf13/afero v1.11.0 // indirect
-	github.com/spf13/cast v1.6.0 // indirect
-	github.com/spf13/pflag v1.0.5 // indirect
-	github.com/subosito/gotenv v1.6.0 // indirect
 	go.uber.org/multierr v1.10.0 // indirect
-	golang.org/x/exp v0.0.0-20230905200255-921286631fa9 // indirect
 	golang.org/x/sys v0.22.0 // indirect
-	golang.org/x/text v0.16.0 // indirect
 	google.golang.org/protobuf v1.34.2 // indirect
-	gopkg.in/ini.v1 v1.67.0 // indirect
 	gopkg.in/yaml.v3 v3.0.1 // indirect
 )