resolvers.go

Documentation: k8s.io/kube-aggregator/pkg/apiserver

     1  /*
     2  Copyright 2017 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 apiserver
    18  
    19  import (
    20  	"net/url"
    21  
    22  	"k8s.io/apiserver/pkg/util/proxy"
    23  	listersv1 "k8s.io/client-go/listers/core/v1"
    24  )
    25  
    26  // A ServiceResolver knows how to get a URL given a service.
    27  type ServiceResolver interface {
    28  	ResolveEndpoint(namespace, name string, port int32) (*url.URL, error)
    29  }
    30  
    31  // NewEndpointServiceResolver returns a ServiceResolver that chooses one of the
    32  // service's endpoints.
    33  func NewEndpointServiceResolver(services listersv1.ServiceLister, endpoints listersv1.EndpointsLister) ServiceResolver {
    34  	return &aggregatorEndpointRouting{
    35  		services:  services,
    36  		endpoints: endpoints,
    37  	}
    38  }
    39  
    40  type aggregatorEndpointRouting struct {
    41  	services  listersv1.ServiceLister
    42  	endpoints listersv1.EndpointsLister
    43  }
    44  
    45  func (r *aggregatorEndpointRouting) ResolveEndpoint(namespace, name string, port int32) (*url.URL, error) {
    46  	return proxy.ResolveEndpoint(r.services, r.endpoints, namespace, name, port)
    47  }
    48  
    49  // NewClusterIPServiceResolver returns a ServiceResolver that directly calls the
    50  // service's cluster IP.
    51  func NewClusterIPServiceResolver(services listersv1.ServiceLister) ServiceResolver {
    52  	return &aggregatorClusterRouting{
    53  		services: services,
    54  	}
    55  }
    56  
    57  type aggregatorClusterRouting struct {
    58  	services listersv1.ServiceLister
    59  }
    60  
    61  func (r *aggregatorClusterRouting) ResolveEndpoint(namespace, name string, port int32) (*url.URL, error) {
    62  	return proxy.ResolveCluster(r.services, namespace, name, port)
    63  }
    64  
    65  // NewLoopbackServiceResolver returns a ServiceResolver that routes
    66  // the kubernetes/default service with port 443 to loopback.
    67  func NewLoopbackServiceResolver(delegate ServiceResolver, host *url.URL) ServiceResolver {
    68  	return &loopbackResolver{
    69  		delegate: delegate,
    70  		host:     host,
    71  	}
    72  }
    73  
    74  type loopbackResolver struct {
    75  	delegate ServiceResolver
    76  	host     *url.URL
    77  }
    78  
    79  func (r *loopbackResolver) ResolveEndpoint(namespace, name string, port int32) (*url.URL, error) {
    80  	if namespace == "default" && name == "kubernetes" && port == 443 {
    81  		return r.host, nil
    82  	}
    83  	return r.delegate.ResolveEndpoint(namespace, name, port)
    84  }
    85
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