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/
dialer.go
108 lines (93 loc) · 2.36 KB
/
dialer.go
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package k8schannel
import (
"context"
"fmt"
"io"
"net/http"
"net/url"
"strings"
"time"
"github.com/gorilla/websocket"
"k8s.io/client-go/rest"
)
type Dialer struct {
dialer *websocket.Dialer
headers http.Header
needsInit bool
}
func (d *Dialer) DialWebsocket(ctx context.Context, url string, headers http.Header) (*websocket.Conn, *http.Response, error) {
newHeaders := http.Header{}
for k, v := range d.headers {
newHeaders[k] = v
}
for k, v := range headers {
newHeaders[k] = v
}
if strings.HasPrefix(url, "http") {
url = strings.Replace(url, "http", "ws", 1)
}
conn, resp, err := d.dialer.DialContext(ctx, url, newHeaders)
if err != nil {
if resp != nil && resp.Body != nil {
data, readErr := io.ReadAll(resp.Body)
if readErr == nil && len(data) > 0 {
return nil, nil, fmt.Errorf("%w: %s", err, data)
}
}
return nil, nil, err
}
return conn, resp, nil
}
func (d *Dialer) DialMultiplexed(ctx context.Context, url string, headers http.Header) (*Connection, error) {
conn, _, err := d.DialWebsocket(ctx, url, headers)
if err != nil {
return nil, err
}
return NewConnection(conn, true), nil
}
func (d *Dialer) DialContext(ctx context.Context, url string, headers http.Header) (*Connection, error) {
conn, _, err := d.DialWebsocket(ctx, url, headers)
if err != nil {
return nil, err
}
return NewConnection(conn, d.needsInit), nil
}
type headerCapture struct {
headers http.Header
}
func GetHeadersFor(cfg *rest.Config) (http.Header, error) {
headerCapture := &headerCapture{}
rt, err := rest.HTTPWrappersForConfig(cfg, headerCapture)
if err != nil {
return nil, err
}
_, err = rt.RoundTrip(&http.Request{
Header: http.Header{},
URL: &url.URL{},
})
return headerCapture.headers, err
}
func (h *headerCapture) RoundTrip(request *http.Request) (*http.Response, error) {
h.headers = request.Header
return &http.Response{}, nil
}
func NewDialer(cfg *rest.Config, needsInit bool) (*Dialer, error) {
tlsConfig, err := rest.TLSConfigFor(cfg)
if err != nil {
return nil, err
}
headers, err := GetHeadersFor(cfg)
if err != nil {
return nil, err
}
return &Dialer{
needsInit: needsInit,
dialer: &websocket.Dialer{
Subprotocols: []string{"v4.channel.k8s.io"},
Proxy: http.ProxyFromEnvironment,
HandshakeTimeout: 45 * time.Second,
TLSClientConfig: tlsConfig,
},
headers: headers,
}, nil
}