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flags.go
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flags.go
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package beat
// FlagsHandler is an interface that can optionally be implemented by a Beat
// if it needs to process command line flags on startup. If implemented, the
// HandleFlags method will be invoked after parsing the command line flags
// and before any of the Beater interface methods are invoked. There will be
// no callback when '-help' or '-version' are specified.
type FlagsHandler interface {
HandleFlags(*Beat) error // Handle any custom command line arguments.
}
type FlagsHandlerCallback func(*Beat) error
var handlers []FlagsHandler
func AddFlagsHandler(h FlagsHandler) {
handlers = append(handlers, h)
}
func AddFlagsCallback(cb func(*Beat) error) {
AddFlagsHandler(FlagsHandlerCallback(cb))
}
func handleFlags(b *Beat) error {
for _, h := range handlers {
err := h.HandleFlags(b)
if err != nil {
return err
}
}
return nil
}
func (cb FlagsHandlerCallback) HandleFlags(b *Beat) error {
return cb(b)
}