mirror of https://github.com/k3s-io/k3s
99 lines
3.1 KiB
Go
99 lines
3.1 KiB
Go
/*
|
|
Copyright 2017 The Kubernetes Authors.
|
|
|
|
Licensed under the Apache License, Version 2.0 (the "License");
|
|
you may not use this file except in compliance with the License.
|
|
You may obtain a copy of the License at
|
|
|
|
http://www.apache.org/licenses/LICENSE-2.0
|
|
|
|
Unless required by applicable law or agreed to in writing, software
|
|
distributed under the License is distributed on an "AS IS" BASIS,
|
|
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
See the License for the specific language governing permissions and
|
|
limitations under the License.
|
|
*/
|
|
|
|
package spdy
|
|
|
|
import (
|
|
"fmt"
|
|
"net/http"
|
|
"net/url"
|
|
|
|
"k8s.io/apimachinery/pkg/util/httpstream"
|
|
"k8s.io/apimachinery/pkg/util/httpstream/spdy"
|
|
restclient "k8s.io/client-go/rest"
|
|
)
|
|
|
|
// Upgrader validates a response from the server after a SPDY upgrade.
|
|
type Upgrader interface {
|
|
// NewConnection validates the response and creates a new Connection.
|
|
NewConnection(resp *http.Response) (httpstream.Connection, error)
|
|
}
|
|
|
|
// RoundTripperFor returns a round tripper and upgrader to use with SPDY.
|
|
func RoundTripperFor(config *restclient.Config) (http.RoundTripper, Upgrader, error) {
|
|
tlsConfig, err := restclient.TLSConfigFor(config)
|
|
if err != nil {
|
|
return nil, nil, err
|
|
}
|
|
proxy := http.ProxyFromEnvironment
|
|
if config.Proxy != nil {
|
|
proxy = config.Proxy
|
|
}
|
|
upgradeRoundTripper := spdy.NewRoundTripperWithProxy(tlsConfig, true, false, proxy)
|
|
wrapper, err := restclient.HTTPWrappersForConfig(config, upgradeRoundTripper)
|
|
if err != nil {
|
|
return nil, nil, err
|
|
}
|
|
return wrapper, upgradeRoundTripper, nil
|
|
}
|
|
|
|
// dialer implements the httpstream.Dialer interface.
|
|
type dialer struct {
|
|
client *http.Client
|
|
upgrader Upgrader
|
|
method string
|
|
url *url.URL
|
|
}
|
|
|
|
var _ httpstream.Dialer = &dialer{}
|
|
|
|
// NewDialer will create a dialer that connects to the provided URL and upgrades the connection to SPDY.
|
|
func NewDialer(upgrader Upgrader, client *http.Client, method string, url *url.URL) httpstream.Dialer {
|
|
return &dialer{
|
|
client: client,
|
|
upgrader: upgrader,
|
|
method: method,
|
|
url: url,
|
|
}
|
|
}
|
|
|
|
func (d *dialer) Dial(protocols ...string) (httpstream.Connection, string, error) {
|
|
req, err := http.NewRequest(d.method, d.url.String(), nil)
|
|
if err != nil {
|
|
return nil, "", fmt.Errorf("error creating request: %v", err)
|
|
}
|
|
return Negotiate(d.upgrader, d.client, req, protocols...)
|
|
}
|
|
|
|
// Negotiate opens a connection to a remote server and attempts to negotiate
|
|
// a SPDY connection. Upon success, it returns the connection and the protocol selected by
|
|
// the server. The client transport must use the upgradeRoundTripper - see RoundTripperFor.
|
|
func Negotiate(upgrader Upgrader, client *http.Client, req *http.Request, protocols ...string) (httpstream.Connection, string, error) {
|
|
for i := range protocols {
|
|
req.Header.Add(httpstream.HeaderProtocolVersion, protocols[i])
|
|
}
|
|
resp, err := client.Do(req)
|
|
if err != nil {
|
|
return nil, "", fmt.Errorf("error sending request: %v", err)
|
|
}
|
|
defer resp.Body.Close()
|
|
conn, err := upgrader.NewConnection(resp)
|
|
if err != nil {
|
|
return nil, "", err
|
|
}
|
|
return conn, resp.Header.Get(httpstream.HeaderProtocolVersion), nil
|
|
}
|