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Commit fa2b211e authored by Oliver Herms's avatar Oliver Herms
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Add convenience functions for AS Paths

parent 4cd42e2f
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......@@ -44,12 +44,54 @@ func (a *ASPath) Compare(b *ASPath) bool {
return true
}
// GetFirstSequenceSegment gets the first sequence of an AS path
func (a *ASPath) GetFirstSequenceSegment() *ASPathSegment {
for _, seg := range *a {
if seg.Type == ASSequence {
return &seg
}
}
return nil
}
// GetLastSequenceSegment gets the last sequence of an AS path
func (a *ASPath) GetLastSequenceSegment() *ASPathSegment {
for i := len(*a) - 1; i >= 0; i-- {
if (*a)[i].Type == ASSequence {
return &(*a)[i]
}
}
return nil
}
// ASPathSegment represents an AS Path Segment (RFC4271)
type ASPathSegment struct {
Type uint8
ASNs []uint32
}
// GetFirstASN returns the first ASN of an AS path segment
func (s ASPathSegment) GetFirstASN() *uint32 {
if len(s.ASNs) == 0 {
return nil
}
ret := s.ASNs[0]
return &ret
}
// GetLastASN returns the last ASN of an AS path segment
func (s ASPathSegment) GetLastASN() *uint32 {
if len(s.ASNs) == 0 {
return nil
}
ret := s.ASNs[len(s.ASNs)-1]
return &ret
}
// Compare checks if ASPathSegments are the same
func (s ASPathSegment) Compare(t ASPathSegment) bool {
if s.Type != t.Type {
......
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