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diff.go
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diff.go
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// Copyright 2019 Authors of Cilium
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package cidr
func createIPNetMap(list []*CIDR) map[string]*CIDR {
m := map[string]*CIDR{}
for _, c := range list {
if c != nil {
m[c.String()] = c
}
}
return m
}
func listMissingIPNets(existing map[string]*CIDR, new []*CIDR) (missing []*CIDR) {
for _, c := range new {
if c != nil {
if _, ok := existing[c.String()]; !ok {
missing = append(missing, c)
}
}
}
return
}
// DiffCIDRLists compares an old and new list of CIDRs and returns the list of
// removed and added CIDRs
func DiffCIDRLists(old, new []*CIDR) (add, remove []*CIDR) {
add = listMissingIPNets(createIPNetMap(old), new)
remove = listMissingIPNets(createIPNetMap(new), old)
return
}