func providePcapFilter()

in pcap-cli/pkg/pcap/pcap.go [183:215]

• 27 lines of code
• 9 McCabe index (conditional complexity)

func providePcapFilter(
	ctx context.Context,
	filter *string,
	providers []PcapFilterProvider,
) *string {
	select {
	case <-ctx.Done():
		return filter
	default:
	}

	pcapFilter := ""

	// if `filter` is available, then providers are not used to build the BPF filter.
	if filter != nil && *filter != "" && !strings.EqualFold(*filter, "DISABLED") {
		// `filter` is extremely unsafe as it is a free form expression:
		// [ToDo] – validate `filter` to enforce correctness of expressions.
		pcapFilter = stringFormatter.Format("({0})", *filter)
	} else if len(providers) > 0 {
		for _, provider := range providers {
			if provider != nil {
				if f := provider.Apply(ctx,
					&pcapFilter, PCAP_FILTER_MODE_AND); f != nil {
					pcapFilter = *f
				}
			}
		}
	} else {
		pcapFilter = string(PcapDefaultFilter)
	}

	return &pcapFilter
}