I am connected to a server, in Kubernetes cluster, with POST request and headers to upgrade the request. I am using the following function:
func PostRequest(client *http.Client, url string, bodyData []byte) (*http.Response, error){
req, _ := http.NewRequest("POST", url, bytes.NewBuffer(bodyData))
//req.Header.Set("Authorization", "Bearer " + BEARER_TOKEN)
req.Header.Set("X-Stream-Protocol-Version", "v2.channel.k8s.io")
req.Header.Set("X-Stream-Protocol-Version", "channel.k8s.io")
req.Header.Set("Upgrade", "SPDY/3.1")
req.Header.Set("Connection","upgrade")
req.Header.Set("Content-Type", "application/x-www-form-urlencoded")
resp, err := (*client).Do(req)
return resp, err
}
After I received the response, I tried to read it but it stuck when I read the body:
url2 := "https://<serveri_ip>:10250/exec/default/mypod/mycontainer?command=ls&command=/&input=1&output=1&tty=1"
resp, err := PostRequest(api.GlobalClient, url2, []byte(""))
fmt.Println(r.Status)
fmt.Println(r.Header)
bodyBytes, err := ioutil.ReadAll(r.Body) // -> it stuck here
fmt.Println(string(bodyBytes)) I suppose it tried to open websocket, so I tried to use gorilla websocket library like that:
u := url.URL{Scheme: "ws", Host: "<node_ip>:10250", Path: "/exec/default/mypod/mycontainer?command=ls&command=/&input=1&output=1&tty=1"}
interrupt := make(chan os.Signal, 1)
signal.Notify(interrupt, os.Interrupt)
c, _, err := websocket.DefaultDialer.Dial(u.String(), nil)
if err != nil {
log.Fatal("dial:", err)
}
defer c.Close()
But it printed an error:
2020/04/04 20:51:25 dial:websocket: bad handshake
What I am doing wrong?
How can I read response body from status "Switching Protocols"
I managed to do it with Kubernetes go-client library:
package main
import (
"crypto/tls"
"fmt"
"net/http"
"net/url"
"os"
"time"
restclient "k8s.io/client-go/rest"
"k8s.io/client-go/tools/remotecommand"
)
func main(){
/*req.Header.Add("X-Stream-Protocol-Version", "v4.channel.k8s.io")
req.Header.Add("X-Stream-Protocol-Version", "v3.channel.k8s.io")
req.Header.Add("X-Stream-Protocol-Version", "v2.channel.k8s.io")
req.Header.Add("X-Stream-Protocol-Version", "channel.k8s.io")
req.Header.Add("Connection", "upgrade")
req.Header.Add("Upgrade", "SPDY/3.1")*/
//url2 := "https://123.123.123.123:10250/exec/default/my-pod/nginx?command=ls&command=/&input=1&output=1&tty=1"
tr := &http.Transport{
MaxIdleConns: 10,
IdleConnTimeout: 30 * time.Second,
DisableCompression: true,
TLSClientConfig: &tls.Config{InsecureSkipVerify: true},
}
config := &restclient.Config{
Host: "https://123.123.123.123:10250",
APIPath: "/exec/default/my-pod/nginx",
TLSClientConfig: restclient.TLSClientConfig{
Insecure: true,
},
Transport: tr,
}
url3 := &url.URL{
Scheme: "https",
Opaque: "",
User: nil,
Host: "123.123.123.123:10250",
Path: "/exec/default/my-pod/nginx",
RawPath: "",
RawQuery: "command=ls&command=/&input=1&output=1&tty=1",
}
exec, err := remotecommand.NewSPDYExecutor(config, "POST", url3)
if err != nil {
fmt.Println(err)
}
// Thanks for this blog post https://www.henryxieblogs.com/2019/05/
err = exec.Stream(remotecommand.StreamOptions{
Stdin: os.Stdin,
Stdout: os.Stdout,
Stderr: os.Stderr,
Tty:true,
})
fmt.Println(err)
}