proxy.go

Documentation: k8s.io/kubernetes/pkg/registry/core/node/rest

     1  /*
     2  Copyright 2015 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 node
    18  
    19  import (
    20  	"context"
    21  	"fmt"
    22  	"net/http"
    23  	"net/url"
    24  
    25  	"k8s.io/apimachinery/pkg/runtime"
    26  	"k8s.io/apimachinery/pkg/util/net"
    27  	"k8s.io/apimachinery/pkg/util/proxy"
    28  	genericregistry "k8s.io/apiserver/pkg/registry/generic/registry"
    29  	"k8s.io/apiserver/pkg/registry/rest"
    30  	api "k8s.io/kubernetes/pkg/apis/core"
    31  	"k8s.io/kubernetes/pkg/capabilities"
    32  	"k8s.io/kubernetes/pkg/kubelet/client"
    33  	"k8s.io/kubernetes/pkg/registry/core/node"
    34  )
    35  
    36  // ProxyREST implements the proxy subresource for a Node
    37  type ProxyREST struct {
    38  	Store          *genericregistry.Store
    39  	Connection     client.ConnectionInfoGetter
    40  	ProxyTransport http.RoundTripper
    41  }
    42  
    43  // Implement Connecter
    44  var _ = rest.Connecter(&ProxyREST{})
    45  
    46  var proxyMethods = []string{"GET", "POST", "PUT", "PATCH", "DELETE", "HEAD", "OPTIONS"}
    47  
    48  // New returns an empty nodeProxyOptions object.
    49  func (r *ProxyREST) New() runtime.Object {
    50  	return &api.NodeProxyOptions{}
    51  }
    52  
    53  // Destroy cleans up resources on shutdown.
    54  func (r *ProxyREST) Destroy() {
    55  	// Given that underlying store is shared with REST,
    56  	// we don't destroy it here explicitly.
    57  }
    58  
    59  // ConnectMethods returns the list of HTTP methods that can be proxied
    60  func (r *ProxyREST) ConnectMethods() []string {
    61  	return proxyMethods
    62  }
    63  
    64  // NewConnectOptions returns versioned resource that represents proxy parameters
    65  func (r *ProxyREST) NewConnectOptions() (runtime.Object, bool, string) {
    66  	return &api.NodeProxyOptions{}, true, "path"
    67  }
    68  
    69  // Connect returns a handler for the node proxy
    70  func (r *ProxyREST) Connect(ctx context.Context, id string, opts runtime.Object, responder rest.Responder) (http.Handler, error) {
    71  	proxyOpts, ok := opts.(*api.NodeProxyOptions)
    72  	if !ok {
    73  		return nil, fmt.Errorf("Invalid options object: %#v", opts)
    74  	}
    75  	location, transport, err := node.ResourceLocation(r.Store, r.Connection, r.ProxyTransport, ctx, id)
    76  	if err != nil {
    77  		return nil, err
    78  	}
    79  	location.Path = net.JoinPreservingTrailingSlash(location.Path, proxyOpts.Path)
    80  	// Return a proxy handler that uses the desired transport, wrapped with additional proxy handling (to get URL rewriting, X-Forwarded-* headers, etc)
    81  	return newThrottledUpgradeAwareProxyHandler(location, transport, true, false, responder), nil
    82  }
    83  
    84  func newThrottledUpgradeAwareProxyHandler(location *url.URL, transport http.RoundTripper, wrapTransport, upgradeRequired bool, responder rest.Responder) *proxy.UpgradeAwareHandler {
    85  	handler := proxy.NewUpgradeAwareHandler(location, transport, wrapTransport, upgradeRequired, proxy.NewErrorResponder(responder))
    86  	handler.MaxBytesPerSec = capabilities.Get().PerConnectionBandwidthLimitBytesPerSec
    87  	return handler
    88  }
    89
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