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utils.go
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/
utils.go
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// Copyright 2019 Samaritan Authors
//
// 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 config
func diffSlice(a, b []string) (add, del []string) {
setA := make(map[string]struct{}, len(add))
setB := make(map[string]struct{}, len(del))
all := make(map[string]struct{}, len(add)+len(del))
for _, ele := range a {
setA[ele] = struct{}{}
all[ele] = struct{}{}
}
for _, ele := range b {
setB[ele] = struct{}{}
all[ele] = struct{}{}
}
for k := range all {
_, inA := setA[k]
_, inB := setB[k]
switch {
case inA && !inB:
del = append(del, k)
case !inA && inB:
add = append(add, k)
}
}
return
}