58 lines
1.3 KiB
Go
58 lines
1.3 KiB
Go
// Package fall handles the fallthrough logic used in plugins that support it.
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package fall
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import (
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"github.com/coredns/coredns/plugin"
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)
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// F can be nil to allow for no fallthrough, empty allow all zones to fallthrough or
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// contain a zone list that is checked.
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type F struct {
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Zones []string
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}
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// Through will check if we should fallthrough for qname. Note that we've named the
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// variable in each plugin "Fall", so this then reads Fall.Through().
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func (f F) Through(qname string) bool {
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return plugin.Zones(f.Zones).Matches(qname) != ""
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}
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// setZones will set zones in f.
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func (f *F) setZones(zones []string) {
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for i := range zones {
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zones[i] = plugin.Host(zones[i]).Normalize()
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}
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f.Zones = zones
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}
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// SetZonesFromArgs sets zones in f to the passed value or to "." if the slice is empty.
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func (f *F) SetZonesFromArgs(zones []string) {
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if len(zones) == 0 {
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f.setZones(Root.Zones)
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return
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}
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f.setZones(zones)
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}
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// Equal returns true if f and g are equal.
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func (f F) Equal(g F) bool {
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if len(f.Zones) != len(g.Zones) {
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return false
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}
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for i := range f.Zones {
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if f.Zones[i] != g.Zones[i] {
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return false
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}
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}
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return true
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}
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// Zero returns a zero valued F.
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var Zero = func() F {
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return F{[]string{}}
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}()
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// Root returns F set to only ".".
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var Root = func() F {
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return F{[]string{"."}}
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}()
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