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forward.go
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forward.go
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package cmd
import (
"os"
"os/signal"
"strconv"
"syscall"
"github.com/bendrucker/kubernetes-port-forward-remote/pkg/forward"
"github.com/spf13/cobra"
"k8s.io/cli-runtime/pkg/genericclioptions"
"k8s.io/client-go/kubernetes"
"k8s.io/client-go/tools/clientcmd"
)
func NewForwardCommand(streams genericclioptions.IOStreams, stopChan chan struct{}) *cobra.Command {
overrides := clientcmd.ConfigOverrides{}
cmd := &cobra.Command{
Use: "kubectl port-forward-remote",
Short: "Forward from a local port to a remote host via a Kubernetes pod",
Args: cobra.ExactArgs(2),
RunE: func(cmd *cobra.Command, args []string) error {
kc := clientcmd.NewNonInteractiveDeferredLoadingClientConfig(
clientcmd.NewDefaultClientConfigLoadingRules(),
&overrides,
)
config, err := kc.ClientConfig()
if err != nil {
return err
}
clientset, err := kubernetes.NewForConfig(config)
if err != nil {
return err
}
port, err := strconv.Atoi(args[1])
if err != nil {
return err
}
spec := forward.Spec{
LocalPort: 0,
RemoteHost: args[0],
RemotePort: port,
}
ns, _, _ := kc.Namespace()
forwarder := forward.Forwarder{
Namespace: ns,
Client: clientset,
Config: config,
IOStreams: streams,
}
return forwarder.Forward(cmd.Context(), spec, stopChan)
},
}
clientcmd.BindOverrideFlags(&overrides, cmd.PersistentFlags(), clientcmd.RecommendedConfigOverrideFlags(""))
return cmd
}
func Execute(streams genericclioptions.IOStreams) {
stopChan := make(chan struct{})
cmd := NewForwardCommand(streams, stopChan)
sigChan := make(chan os.Signal, 1)
signal.Notify(sigChan, os.Interrupt, syscall.SIGTERM)
go func() {
<-sigChan
stopChan <- struct{}{}
}()
cobra.CheckErr(cmd.Execute())
}