mirror of https://github.com/k3s-io/k3s
201 lines
5.5 KiB
Go
201 lines
5.5 KiB
Go
package spegel
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import (
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"context"
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"math/rand"
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"os"
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"path/filepath"
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"strings"
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"time"
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"github.com/k3s-io/k3s/pkg/clientaccess"
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"github.com/k3s-io/k3s/pkg/daemons/config"
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"github.com/k3s-io/k3s/pkg/version"
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"github.com/libp2p/go-libp2p/core/peer"
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"github.com/pkg/errors"
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"github.com/rancher/wrangler/pkg/merr"
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"github.com/sirupsen/logrus"
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"github.com/xenitab/spegel/pkg/routing"
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v1 "k8s.io/api/core/v1"
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metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
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"k8s.io/apimachinery/pkg/labels"
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"k8s.io/apimachinery/pkg/util/wait"
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nodeutil "k8s.io/kubernetes/pkg/controller/util/node"
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)
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// explicit interface checks
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var _ routing.Bootstrapper = &selfBootstrapper{}
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var _ routing.Bootstrapper = &agentBootstrapper{}
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var _ routing.Bootstrapper = &serverBootstrapper{}
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var _ routing.Bootstrapper = &chainingBootstrapper{}
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type selfBootstrapper struct {
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id string
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}
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// NewSelfBootstrapper returns a stub p2p bootstrapper that just returns its own ID
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func NewSelfBootstrapper() routing.Bootstrapper {
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return &selfBootstrapper{}
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}
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func (s *selfBootstrapper) Run(_ context.Context, id string) error {
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s.id = id
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return nil
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}
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func (s *selfBootstrapper) GetAddress() (*peer.AddrInfo, error) {
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return peer.AddrInfoFromString(s.id)
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}
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type agentBootstrapper struct {
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server string
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token string
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clientCert string
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clientKey string
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}
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// NewAgentBootstrapper returns a p2p bootstrapper that retrieves a peer address from its server
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func NewAgentBootstrapper(server, token, dataDir string) routing.Bootstrapper {
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return &agentBootstrapper{
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clientCert: filepath.Join(dataDir, "agent", "client-kubelet.crt"),
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clientKey: filepath.Join(dataDir, "agent", "client-kubelet.key"),
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server: server,
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token: token,
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}
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}
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func (c *agentBootstrapper) Run(_ context.Context, _ string) error {
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return nil
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}
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func (c *agentBootstrapper) GetAddress() (*peer.AddrInfo, error) {
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if c.server == "" || c.token == "" {
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return nil, errors.New("cannot get addresses without server and token")
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}
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withCert := clientaccess.WithClientCertificate(c.clientCert, c.clientKey)
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info, err := clientaccess.ParseAndValidateToken(c.server, c.token, withCert)
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if err != nil {
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return nil, err
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}
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addr, err := info.Get("/v1-" + version.Program + "/p2p")
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if err != nil {
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return nil, err
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}
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addrInfo, err := peer.AddrInfoFromString(string(addr))
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return addrInfo, err
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}
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type serverBootstrapper struct {
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controlConfig *config.Control
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}
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// NewServerBootstrapper returns a p2p bootstrapper that returns an address from a random other cluster member.
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func NewServerBootstrapper(controlConfig *config.Control) routing.Bootstrapper {
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return &serverBootstrapper{
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controlConfig: controlConfig,
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}
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}
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func (s *serverBootstrapper) Run(_ context.Context, id string) error {
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s.controlConfig.Runtime.ClusterControllerStarts["spegel-p2p"] = func(ctx context.Context) {
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nodes := s.controlConfig.Runtime.Core.Core().V1().Node()
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wait.PollImmediateUntilWithContext(ctx, 1*time.Second, func(ctx context.Context) (bool, error) {
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nodeName := os.Getenv("NODE_NAME")
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if nodeName == "" {
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return false, nil
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}
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node, err := nodes.Get(nodeName, metav1.GetOptions{})
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if err != nil {
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return false, nil
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}
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if node.Annotations == nil {
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node.Annotations = map[string]string{}
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}
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node.Annotations[P2pAddressAnnotation] = id
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if node.Labels == nil {
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node.Labels = map[string]string{}
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}
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node.Labels[P2pEnabledLabel] = "true"
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if _, err = nodes.Update(node); err != nil {
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return false, nil
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}
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logrus.Infof("Node P2P address annotations and labels added: %s", id)
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return true, nil
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})
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}
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return nil
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}
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func (s *serverBootstrapper) GetAddress() (addrInfo *peer.AddrInfo, err error) {
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if s.controlConfig.Runtime.Core == nil {
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return nil, errors.New("runtime core not ready")
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}
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nodeName := os.Getenv("NODE_NAME")
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if nodeName == "" {
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return nil, errors.New("node name not set")
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}
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nodes := s.controlConfig.Runtime.Core.Core().V1().Node()
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labelSelector := labels.Set{P2pEnabledLabel: "true"}.String()
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nodeList, err := nodes.List(metav1.ListOptions{LabelSelector: labelSelector})
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if err != nil {
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return nil, err
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}
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for _, i := range rand.Perm(len(nodeList.Items)) {
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node := nodeList.Items[i]
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if node.Name == nodeName {
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// don't return our own address
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continue
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}
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if find, condition := nodeutil.GetNodeCondition(&node.Status, v1.NodeReady); find == -1 || condition.Status != v1.ConditionTrue {
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// don't return the address of a not-ready node
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continue
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}
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if val, ok := node.Annotations[P2pAddressAnnotation]; ok {
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for _, addr := range strings.Split(val, ",") {
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if info, err := peer.AddrInfoFromString(addr); err == nil {
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return info, nil
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}
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}
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}
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}
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return nil, errors.New("no ready p2p peers found")
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}
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type chainingBootstrapper struct {
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bootstrappers []routing.Bootstrapper
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}
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// NewChainingBootstrapper returns a p2p bootstrapper that passes through to a list of bootstrappers.
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func NewChainingBootstrapper(bootstrappers ...routing.Bootstrapper) routing.Bootstrapper {
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return &chainingBootstrapper{
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bootstrappers: bootstrappers,
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}
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}
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func (c *chainingBootstrapper) Run(ctx context.Context, id string) error {
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errs := merr.Errors{}
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for _, b := range c.bootstrappers {
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if err := b.Run(ctx, id); err != nil {
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errs = append(errs, err)
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}
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}
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return merr.NewErrors(errs...)
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}
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func (c *chainingBootstrapper) GetAddress() (*peer.AddrInfo, error) {
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errs := merr.Errors{}
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for _, b := range c.bootstrappers {
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addr, err := b.GetAddress()
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if err == nil {
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return addr, nil
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}
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errs = append(errs, err)
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}
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return nil, merr.NewErrors(errs...)
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}
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