forked from coredns/coredns
/
fall.go
58 lines (50 loc) · 1.29 KB
/
fall.go
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// Package fall handles the fallthrough logic used in plugins that support it.
package fall
import (
"github.com/coredns/coredns/plugin"
)
// F can be nil to allow for no fallthrough, empty allow all zones to fallthrough or
// contain a zone list that is checked.
type F struct {
Zones []string
}
// Through will check if we should fallthrough for qname. Note that we've named the
// variable in each plugin "Fall", so this then reads Fall.Through().
func (f F) Through(qname string) bool {
return plugin.Zones(f.Zones).Matches(qname) != ""
}
// setZones will set zones in f.
func (f *F) setZones(zones []string) {
for i := range zones {
zones[i] = plugin.Host(zones[i]).Normalize()
}
f.Zones = zones
}
// SetZonesFromArgs sets zones in f to the passed value or to "." if the slice is empty.
func (f *F) SetZonesFromArgs(zones []string) {
if len(zones) == 0 {
f.setZones(Root.Zones)
return
}
f.setZones(zones)
}
// Equal returns true if f and g are equal.
func (f F) Equal(g F) bool {
if len(f.Zones) != len(g.Zones) {
return false
}
for i := range f.Zones {
if f.Zones[i] != g.Zones[i] {
return false
}
}
return true
}
// Zero returns a zero valued F.
var Zero = func() F {
return F{[]string{}}
}()
// Root returns F set to only ".".
var Root = func() F {
return F{[]string{"."}}
}()