mirror of https://github.com/k3s-io/k3s
79 lines
2.7 KiB
Go
79 lines
2.7 KiB
Go
/*
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Copyright 2015 The Kubernetes Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package service
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import (
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"context"
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"fmt"
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"net/http"
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"net/url"
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"k8s.io/apimachinery/pkg/runtime"
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"k8s.io/apimachinery/pkg/util/net"
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"k8s.io/apimachinery/pkg/util/proxy"
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"k8s.io/apiserver/pkg/registry/rest"
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api "k8s.io/kubernetes/pkg/apis/core"
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"k8s.io/kubernetes/pkg/capabilities"
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)
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// ProxyREST implements the proxy subresource for a Service
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type ProxyREST struct {
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Redirector rest.Redirector
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ProxyTransport http.RoundTripper
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}
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// Implement Connecter
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var _ = rest.Connecter(&ProxyREST{})
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var proxyMethods = []string{"GET", "POST", "PUT", "PATCH", "DELETE", "HEAD", "OPTIONS"}
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// New returns an empty service resource
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func (r *ProxyREST) New() runtime.Object {
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return &api.ServiceProxyOptions{}
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}
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// ConnectMethods returns the list of HTTP methods that can be proxied
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func (r *ProxyREST) ConnectMethods() []string {
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return proxyMethods
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}
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// NewConnectOptions returns versioned resource that represents proxy parameters
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func (r *ProxyREST) NewConnectOptions() (runtime.Object, bool, string) {
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return &api.ServiceProxyOptions{}, true, "path"
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}
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// Connect returns a handler for the service proxy
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func (r *ProxyREST) Connect(ctx context.Context, id string, opts runtime.Object, responder rest.Responder) (http.Handler, error) {
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proxyOpts, ok := opts.(*api.ServiceProxyOptions)
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if !ok {
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return nil, fmt.Errorf("Invalid options object: %#v", opts)
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}
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location, transport, err := r.Redirector.ResourceLocation(ctx, id)
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if err != nil {
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return nil, err
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}
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location.Path = net.JoinPreservingTrailingSlash(location.Path, proxyOpts.Path)
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// Return a proxy handler that uses the desired transport, wrapped with additional proxy handling (to get URL rewriting, X-Forwarded-* headers, etc)
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return newThrottledUpgradeAwareProxyHandler(location, transport, true, false, responder), nil
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}
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func newThrottledUpgradeAwareProxyHandler(location *url.URL, transport http.RoundTripper, wrapTransport, upgradeRequired bool, responder rest.Responder) *proxy.UpgradeAwareHandler {
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handler := proxy.NewUpgradeAwareHandler(location, transport, wrapTransport, upgradeRequired, proxy.NewErrorResponder(responder))
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handler.MaxBytesPerSec = capabilities.Get().PerConnectionBandwidthLimitBytesPerSec
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return handler
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}
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