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port_forward_manager.go
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/
port_forward_manager.go
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package port_forward
import (
"fmt"
"os"
"os/signal"
"path/filepath"
"strconv"
"syscall"
"bunnyshell.com/cli/pkg/environment"
"bunnyshell.com/cli/pkg/k8s"
"bunnyshell.com/cli/pkg/lib"
"bunnyshell.com/cli/pkg/util"
v1 "k8s.io/api/core/v1"
"k8s.io/client-go/tools/portforward"
)
const (
PortForwardDefaultInterface = "127.0.0.1"
KubeConfigFilename = "kube-config-pfwd.yaml"
)
var (
ErrNoPods = fmt.Errorf("the selected resource has no pods")
TerminationSignals = []os.Signal{
syscall.SIGINT,
syscall.SIGTERM,
}
)
type PortForwardManager struct {
environmentResource *environment.EnvironmentResource
pod *v1.Pod
environmentWorkspaceDir string
kubernetesClient *k8s.KubernetesClient
kubeConfigPath string
portForwards []*k8s.PortForward
portForwarders []*portforward.PortForwarder
}
func NewPortForwardManager() *PortForwardManager {
portForwardManager := &PortForwardManager{
environmentResource: environment.NewEnvironmentResource(),
}
return portForwardManager
}
func (m *PortForwardManager) WithEnvironmentResource(environmentResource *environment.EnvironmentResource) *PortForwardManager {
m.environmentResource = environmentResource
return m
}
func (m *PortForwardManager) WithEnvironmentWorkspaceDir(environmentWorkspaceDir string) *PortForwardManager {
m.environmentWorkspaceDir = environmentWorkspaceDir
return m
}
func (m *PortForwardManager) WithKubeConfigPath(kubeConfigPath string) *PortForwardManager {
m.kubeConfigPath = kubeConfigPath
return m
}
func (m *PortForwardManager) WithKubernetesClient(kubernetesClient *k8s.KubernetesClient) *PortForwardManager {
m.kubernetesClient = kubernetesClient
return m
}
func (m *PortForwardManager) WithPod(pod *v1.Pod) *PortForwardManager {
m.pod = pod
return m
}
func (m *PortForwardManager) WithPodName(podName string) *PortForwardManager {
pod, err := m.kubernetesClient.GetPod(m.environmentResource.ComponentResource.GetNamespace(), podName)
if err != nil {
panic(fmt.Errorf("invalid pod name: %s", podName))
}
return m.WithPod(pod)
}
func (m *PortForwardManager) WithPortMappings(portMappings []string) *PortForwardManager {
for _, portMapping := range portMappings {
match := PortMappingExp.FindStringSubmatch(portMapping)
if match == nil {
panic(fmt.Errorf("invalid port mapping: %s", portMapping))
}
var localPort int
var err error
if match[1] != "" {
localPort, err = strconv.Atoi(match[1])
if err != nil {
panic(fmt.Errorf("invalid port mapping: %s", portMapping))
}
} else {
// We will assign a random ephemeral port
localPort = 0
}
remotePort := localPort
if match[3] != "" {
remotePort, err = strconv.Atoi(match[3])
if err != nil {
panic(fmt.Errorf("invalid port mapping: %s", portMapping))
}
}
// We should not get this because of the regex, but let's make sure
if remotePort == 0 {
panic(fmt.Errorf("invalid port mapping: %s", portMapping))
}
m.portForwards = append(m.portForwards, k8s.NewPortForward(PortForwardDefaultInterface, localPort, remotePort))
}
return m
}
func (m *PortForwardManager) ensureEnvironmentWorkspaceDir() error {
workspace, err := util.GetWorkspaceDir()
if err != nil {
return err
}
m.WithEnvironmentWorkspaceDir(filepath.Join(workspace, m.environmentResource.Environment.GetId()))
return os.MkdirAll(m.environmentWorkspaceDir, 0755)
}
func (m *PortForwardManager) ensureEnvironmentKubeConfig() error {
kubeConfigPath := filepath.Join(m.environmentWorkspaceDir, KubeConfigFilename)
if err := lib.DownloadEnvironmentKubeConfig(kubeConfigPath, m.environmentResource.Environment.GetId()); err != nil {
return err
}
m.WithKubeConfigPath(kubeConfigPath)
return nil
}
func (m *PortForwardManager) SelectPod() error {
componentResource := m.environmentResource.ComponentResource
// Fetch the resource list of pods
podsList, err := m.kubernetesClient.WorkflowPodsList(componentResource.GetNamespace(), componentResource.GetKind(), componentResource.GetName())
if err != nil {
return err
}
if len(podsList.Items) == 0 {
return ErrNoPods
}
if len(podsList.Items) == 1 {
m.WithPod(&podsList.Items[0])
return nil
}
var podNames []string
podNamesMap := map[string]*v1.Pod{}
for _, podItem := range podsList.Items {
pod := podItem
podNames = append(podNames, pod.Name)
podNamesMap[pod.Name] = &pod
}
_, podName, err := util.Choose("Select pod", podNames)
if err != nil {
return err
}
m.WithPod(podNamesMap[podName])
return nil
}
func (m *PortForwardManager) PrepareKubernetesClient() error {
if err := m.ensureEnvironmentWorkspaceDir(); err != nil {
return err
}
if err := m.ensureEnvironmentKubeConfig(); err != nil {
return err
}
kubernetesClient, err := k8s.NewKubernetesClient(m.kubeConfigPath)
if err != nil {
return err
}
m.WithKubernetesClient(kubernetesClient)
return nil
}
func (m *PortForwardManager) Start() error {
fmt.Printf("Forwarding ports to pod %s/%s...\n\n", m.environmentResource.ComponentResource.GetNamespace(), m.pod.Name)
for _, portForward := range m.portForwards {
forwarder, err := m.kubernetesClient.PortForward(m.pod, portForward, os.Stdout, os.Stderr)
if err != nil {
return err
}
forwardedPorts, err := forwarder.GetPorts()
if err != nil {
return err
}
if len(forwardedPorts) == 0 {
return fmt.Errorf("could not create port forward for local port %d to remote port %d", portForward.LocalPort, portForward.RemotePort)
}
m.portForwarders = append(m.portForwarders, forwarder)
}
return nil
}
func (m *PortForwardManager) Wait() error {
// exit on cli signal interrupt
signalTermination := make(chan os.Signal, 1)
signal.Notify(signalTermination, TerminationSignals...)
defer signal.Stop(signalTermination)
sig := <-signalTermination
m.Close()
return fmt.Errorf("terminated by signal: %s", sig)
}
func (m *PortForwardManager) Close() {
// Close the port forwarders
for _, portForwarder := range m.portForwarders {
portForwarder.Close()
}
// Close the PortForward channels
for _, portForward := range m.portForwards {
portForward.Close()
}
}