95 lines
3 KiB
Go
95 lines
3 KiB
Go
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/*
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Copyright 2017 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 spdy
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import (
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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/util/httpstream"
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"k8s.io/apimachinery/pkg/util/httpstream/spdy"
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restclient "k8s.io/client-go/rest"
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)
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// Upgrader validates a response from the server after a SPDY upgrade.
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type Upgrader interface {
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// NewConnection validates the response and creates a new Connection.
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NewConnection(resp *http.Response) (httpstream.Connection, error)
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}
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// RoundTripperFor returns a round tripper and upgrader to use with SPDY.
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func RoundTripperFor(config *restclient.Config) (http.RoundTripper, Upgrader, error) {
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tlsConfig, err := restclient.TLSConfigFor(config)
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if err != nil {
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return nil, nil, err
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}
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upgradeRoundTripper := spdy.NewRoundTripper(tlsConfig, true)
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wrapper, err := restclient.HTTPWrappersForConfig(config, upgradeRoundTripper)
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if err != nil {
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return nil, nil, err
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}
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return wrapper, upgradeRoundTripper, nil
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}
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// dialer implements the httpstream.Dialer interface.
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type dialer struct {
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client *http.Client
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upgrader Upgrader
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method string
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url *url.URL
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}
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var _ httpstream.Dialer = &dialer{}
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// NewDialer will create a dialer that connects to the provided URL and upgrades the connection to SPDY.
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func NewDialer(upgrader Upgrader, client *http.Client, method string, url *url.URL) httpstream.Dialer {
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return &dialer{
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client: client,
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upgrader: upgrader,
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method: method,
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url: url,
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}
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}
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func (d *dialer) Dial(protocols ...string) (httpstream.Connection, string, error) {
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req, err := http.NewRequest(d.method, d.url.String(), nil)
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if err != nil {
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return nil, "", fmt.Errorf("error creating request: %v", err)
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}
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return Negotiate(d.upgrader, d.client, req, protocols...)
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}
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// Negotiate opens a connection to a remote server and attempts to negotiate
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// a SPDY connection. Upon success, it returns the connection and the protocol selected by
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// the server. The client transport must use the upgradeRoundTripper - see RoundTripperFor.
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func Negotiate(upgrader Upgrader, client *http.Client, req *http.Request, protocols ...string) (httpstream.Connection, string, error) {
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for i := range protocols {
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req.Header.Add(httpstream.HeaderProtocolVersion, protocols[i])
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}
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resp, err := client.Do(req)
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if err != nil {
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return nil, "", fmt.Errorf("error sending request: %v", err)
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}
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defer resp.Body.Close()
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conn, err := upgrader.NewConnection(resp)
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if err != nil {
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return nil, "", err
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}
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return conn, resp.Header.Get(httpstream.HeaderProtocolVersion), nil
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}
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