4f18bf35a8
Add support for configuring CLI parameters in the application using a new `cfg` package. The `cfg` package exports an `AppSettings` struct that contains the settings the application was run with. Update the application to use the new CLI parameters to set the db to open and the port to use for the metrics server. Add support for setting the app version during build. The app includes a `-version` flag to print the stored version data.
49 lines
1.1 KiB
Go
49 lines
1.1 KiB
Go
package cfg
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import (
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"flag"
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"fmt"
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"os"
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)
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const (
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minServerPort = 1000
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maxServerPort = 65535
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)
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type AppSettings struct {
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VersionMode bool
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MetricsPort int
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Fail2BanDbPath string
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}
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func Parse() *AppSettings {
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appSettings := &AppSettings{}
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flag.BoolVar(&appSettings.VersionMode, "version", false, "show version info and exit")
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flag.IntVar(&appSettings.MetricsPort, "port", 9191, "port to use for the metrics server")
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flag.StringVar(&appSettings.Fail2BanDbPath, "db", "", "path to the fail2ban sqlite database")
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flag.Parse()
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appSettings.validateFlags()
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return appSettings
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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.Fail2BanDbPath == "" {
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fmt.Println("missing flag 'db'")
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flagsValid = false
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}
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if settings.MetricsPort < minServerPort || settings.MetricsPort > maxServerPort {
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fmt.Printf("invalid server port, must be within %d and %d (found %d)\n",
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minServerPort, maxServerPort, settings.MetricsPort)
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flagsValid = false
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}
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}
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if !flagsValid {
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flag.Usage()
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os.Exit(1)
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}
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}
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