istio.io/istio@v0.0.0-20240520182934-d79c90f27776/pkg/test/loadbalancersim/locality/match.go (about)

     1  //  Copyright Istio Authors
     2  //
     3  //  Licensed under the Apache License, Version 2.0 (the "License");
     4  //  you may not use this file except in compliance with the License.
     5  //  You may obtain a copy of the License at
     6  //
     7  //      http://www.apache.org/licenses/LICENSE-2.0
     8  //
     9  //  Unless required by applicable law or agreed to in writing, software
    10  //  distributed under the License is distributed on an "AS IS" BASIS,
    11  //  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    12  //  See the License for the specific language governing permissions and
    13  //  limitations under the License.
    14  
    15  package locality
    16  
    17  type Match func(Instance) bool
    18  
    19  func MatchZone(l Instance) Match {
    20  	return func(o Instance) bool {
    21  		return l.Zone == o.Zone &&
    22  			l.Region == o.Region
    23  	}
    24  }
    25  
    26  func MatchRegion(l Instance) Match {
    27  	return func(o Instance) bool {
    28  		return l.Region == o.Region
    29  	}
    30  }
    31  
    32  func MatchOtherZoneInSameRegion(l Instance) Match {
    33  	return And(MatchRegion(l), Not(MatchZone(l)))
    34  }
    35  
    36  func And(m1 Match, m2 Match) Match {
    37  	return func(o Instance) bool {
    38  		return m1(o) && m2(o)
    39  	}
    40  }
    41  
    42  func Not(match Match) Match {
    43  	return func(o Instance) bool {
    44  		return !match(o)
    45  	}
    46  }