k8s.io/registry.k8s.io@v0.3.1/pkg/net/cidrs/bruteforce.go (about)

     1  /*
     2  Copyright 2022 The Kubernetes Authors.
     3  
     4  Licensed under the Apache License, Version 2.0 (the "License");
     5  you may not use this file except in compliance with the License.
     6  You may obtain a copy of the License at
     7  
     8      http://www.apache.org/licenses/LICENSE-2.0
     9  
    10  Unless required by applicable law or agreed to in writing, software
    11  distributed under the License is distributed on an "AS IS" BASIS,
    12  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    13  See the License for the specific language governing permissions and
    14  limitations under the License.
    15  */
    16  
    17  package cidrs
    18  
    19  import (
    20  	"net/netip"
    21  )
    22  
    23  // NewBruteForceMapper returns a naive IPMapper that loops over the map and
    24  // compares all netip.Prefix
    25  //
    26  // This type exists purely for testing and benchmarking
    27  func NewBruteForceMapper[V comparable](mapping map[V][]netip.Prefix) IPMapper[V] {
    28  	return &bruteForceMapper[V]{
    29  		mapping: mapping,
    30  	}
    31  }
    32  
    33  type bruteForceMapper[V comparable] struct {
    34  	mapping map[V][]netip.Prefix
    35  }
    36  
    37  func (b *bruteForceMapper[V]) GetIP(addr netip.Addr) (value V, matched bool) {
    38  	for v, cidrs := range b.mapping {
    39  		for _, cidr := range cidrs {
    40  			if cidr.Contains(addr) {
    41  				return v, true
    42  			}
    43  		}
    44  	}
    45  	return
    46  }