/
portforward.go
57 lines (46 loc) · 1.36 KB
/
portforward.go
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package framework
import (
"bytes"
"fmt"
"net/http"
"net/url"
"path"
"k8s.io/client-go/rest"
"k8s.io/client-go/tools/portforward"
"k8s.io/client-go/transport/spdy"
)
// PortForward starts a port-forward to the specified Pod and returns the local port being forwarded.
func PortForward(config *rest.Config, namespace, podName string, stopCh chan struct{}) (int, error) {
roundTripper, upgrader, err := spdy.RoundTripperFor(config)
if err != nil {
return 0, fmt.Errorf("error creating roundtripper: %w", err)
}
serverURL, err := url.Parse(config.Host)
if err != nil {
return 0, fmt.Errorf("error parsing rest config host: %w", err)
}
serverURL.Path = path.Join(
"api", "v1",
"namespaces", namespace,
"pods", podName,
"portforward",
)
dialer := spdy.NewDialer(upgrader, &http.Client{Transport: roundTripper}, http.MethodPost, serverURL)
readyCh := make(chan struct{}, 1)
out, errOut := new(bytes.Buffer), new(bytes.Buffer)
forwarder, err := portforward.New(dialer, []string{":80"}, stopCh, readyCh, out, errOut)
if err != nil {
return 0, fmt.Errorf("error creating port forwarder: %w", err)
}
go func() {
if err := forwarder.ForwardPorts(); err != nil {
panic(err)
}
}()
<-readyCh
ports, err := forwarder.GetPorts()
if err != nil {
return 0, fmt.Errorf("error getting ports being forwarded: %w", err)
}
return int(ports[0].Local), nil
}