110 lines
3.2 KiB
Go
110 lines
3.2 KiB
Go
package cfg
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import (
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"fmt"
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"github.com/alecthomas/kingpin/v2"
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"os"
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)
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const (
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socketEnvName = "F2B_COLLECTOR_SOCKET"
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fileCollectorPathEnvName = "F2B_COLLECTOR_TEXT_PATH"
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addressEnvName = "F2B_WEB_LISTEN_ADDRESS"
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basicAuthUserEnvName = "F2B_WEB_BASICAUTH_USER"
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basicAuthPassEnvName = "F2B_WEB_BASICAUTH_PASS"
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exitOnSocketConnErrorEnvName = "F2B_EXIT_ON_SOCKET_CONN_ERROR"
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)
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type AppSettings struct {
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VersionMode bool
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MetricsAddress string
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Fail2BanSocketPath string
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FileCollectorPath string
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BasicAuthProvider *hashedBasicAuth
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ExitOnSocketConnError bool
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}
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func init() {
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kingpin.HelpFlag.Short('h')
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}
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func Parse() *AppSettings {
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settings := &AppSettings{}
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readParamsFromCli(settings)
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settings.validateFlags()
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return settings
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}
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func readParamsFromCli(settings *AppSettings) {
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versionMode := kingpin.
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Flag("version", "show version info and exit").
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Short('v').
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Default("false").
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Bool()
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socketPath := kingpin.
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Flag("collector.f2b.socket", "path to the fail2ban server socket").
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Default("/var/run/fail2ban/fail2ban.sock").
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Envar(socketEnvName).
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String()
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fileCollectorPath := kingpin.
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Flag("collector.textfile.directory", "directory to read text files with metrics from").
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Default("").
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Envar(fileCollectorPathEnvName).
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String()
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address := kingpin.
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Flag("web.listen-address", "address to use for the metrics server").
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Default(":9191").
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Envar(addressEnvName).
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String()
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rawBasicAuthUsername := kingpin.
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Flag("web.basic-auth.username", "username to use to protect endpoints with basic auth").
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Default("").
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Envar(basicAuthUserEnvName).
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String()
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rawBasicAuthPassword := kingpin.
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Flag("web.basic-auth.password", "password to use to protect endpoints with basic auth").
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Default("").
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Envar(basicAuthPassEnvName).
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String()
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rawExitOnSocketConnError := kingpin.
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Flag("collector.f2b.exit-on-socket-connection-error", "when set to true the exporter will immediately exit on a fail2ban socket connection error").
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Default("false").
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Envar(exitOnSocketConnErrorEnvName).
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Bool()
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kingpin.Parse()
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settings.VersionMode = *versionMode
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settings.MetricsAddress = *address
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settings.Fail2BanSocketPath = *socketPath
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settings.FileCollectorPath = *fileCollectorPath
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settings.setBasicAuthValues(*rawBasicAuthUsername, *rawBasicAuthPassword)
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settings.ExitOnSocketConnError = *rawExitOnSocketConnError
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}
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func (settings *AppSettings) setBasicAuthValues(rawUsername, rawPassword string) {
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settings.BasicAuthProvider = newHashedBasicAuth(rawUsername, rawPassword)
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}
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func (settings *AppSettings) validateFlags() {
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var flagsValid = true
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if !settings.VersionMode {
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if settings.Fail2BanSocketPath == "" {
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fmt.Println("error: fail2ban socket path must not be blank")
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flagsValid = false
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}
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if settings.MetricsAddress == "" {
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fmt.Println("error: invalid server address, must not be blank")
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flagsValid = false
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}
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if (len(settings.BasicAuthProvider.username) > 0) != (len(settings.BasicAuthProvider.password) > 0) {
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fmt.Println("error: to enable basic auth both the username and the password must be provided")
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flagsValid = false
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}
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}
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if !flagsValid {
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kingpin.Usage()
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os.Exit(1)
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}
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}
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