func NewRoute()

in dispatch/route.go [59:133]
56 lines of code
13 McCabe index (conditional complexity)

func NewRoute(cr *config.Route, parent *Route) *Route {
	// Create default and overwrite with configured settings.
	opts := DefaultRouteOpts
	if parent != nil {
		opts = parent.RouteOpts
	}

	if cr.Receiver != "" {
		opts.Receiver = cr.Receiver
	}

	if cr.GroupBy != nil {
		opts.GroupBy = map[model.LabelName]struct{}{}
		for _, ln := range cr.GroupBy {
			opts.GroupBy[ln] = struct{}{}
		}
		opts.GroupByAll = false
	} else {
		if cr.GroupByAll {
			opts.GroupByAll = cr.GroupByAll
		}
	}

	if cr.GroupWait != nil {
		opts.GroupWait = time.Duration(*cr.GroupWait)
	}
	if cr.GroupInterval != nil {
		opts.GroupInterval = time.Duration(*cr.GroupInterval)
	}
	if cr.RepeatInterval != nil {
		opts.RepeatInterval = time.Duration(*cr.RepeatInterval)
	}

	// Build matchers.
	var matchers labels.Matchers

	// cr.Match will be deprecated. This for loop appends matchers.
	for ln, lv := range cr.Match {
		matcher, err := labels.NewMatcher(labels.MatchEqual, ln, lv)
		if err != nil {
			// This error must not happen because the config already validates the yaml.
			panic(err)
		}
		matchers = append(matchers, matcher)
	}

	// cr.MatchRE will be deprecated. This for loop appends regex matchers.
	for ln, lv := range cr.MatchRE {
		matcher, err := labels.NewMatcher(labels.MatchRegexp, ln, lv.String())
		if err != nil {
			// This error must not happen because the config already validates the yaml.
			panic(err)
		}
		matchers = append(matchers, matcher)
	}

	// We append the new-style matchers. This can be simplified once the deprecated matcher syntax is removed.
	matchers = append(matchers, cr.Matchers...)

	sort.Sort(matchers)

	opts.MuteTimeIntervals = cr.MuteTimeIntervals
	opts.ActiveTimeIntervals = cr.ActiveTimeIntervals

	route := &Route{
		parent:    parent,
		RouteOpts: opts,
		Matchers:  matchers,
		Continue:  cr.Continue,
	}

	route.Routes = NewRoutes(cr.Routes, route)

	return route
}