142 lines
2.6 KiB
Go
142 lines
2.6 KiB
Go
package multiclustermanager
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import (
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"context"
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"fmt"
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"net"
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"net/http"
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"sync"
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"time"
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"github.com/rancher/norman/types"
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"github.com/rancher/rancher/pkg/features"
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"github.com/rancher/rancher/pkg/wrangler"
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"k8s.io/client-go/kubernetes"
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)
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type DeferredServer struct {
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sync.RWMutex
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wrangler *wrangler.Context
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opts *Options
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mcm *mcm
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}
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func NewDeferredServer(wrangler *wrangler.Context, opts *Options) *DeferredServer {
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return &DeferredServer{
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wrangler: wrangler,
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opts: opts,
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}
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}
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func (s *DeferredServer) Wait(ctx context.Context) {
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if !features.MCM.Enabled() {
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return
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}
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for {
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s.Lock()
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if s.mcm == nil {
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s.Unlock()
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select {
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case <-time.After(500 * time.Millisecond):
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continue
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case <-ctx.Done():
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return
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}
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}
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s.Unlock()
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s.mcm.Wait(ctx)
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break
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}
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}
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func (s *DeferredServer) NormanSchemas() *types.Schemas {
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mcm := s.getMCM()
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if mcm == nil {
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return nil
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}
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return mcm.NormanSchemas()
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}
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func (s *DeferredServer) Start(ctx context.Context) error {
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s.Lock()
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defer s.Unlock()
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if s.mcm != nil {
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return nil
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}
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var (
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mcm *mcm
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err error
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)
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err = s.wrangler.StartWithTransaction(ctx, func(ctx context.Context) error {
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mcm, err = newMCM(ctx, s.wrangler, s.opts)
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if err != nil {
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return err
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}
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return mcm.Start(ctx)
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})
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if mcm != nil {
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// always start, even on error
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mcm.started(ctx)
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}
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if err != nil {
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return err
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}
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s.mcm = mcm
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go func() {
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<-ctx.Done()
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s.Lock()
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defer s.Unlock()
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s.mcm = nil
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}()
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return nil
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}
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func (s *DeferredServer) getMCM() *mcm {
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s.RLock()
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defer s.RUnlock()
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return s.mcm
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}
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func (s *DeferredServer) Middleware(next http.Handler) http.Handler {
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return http.HandlerFunc(func(rw http.ResponseWriter, req *http.Request) {
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mcm := s.getMCM()
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if mcm == nil {
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next.ServeHTTP(rw, req)
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return
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}
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mcm.Middleware(next).ServeHTTP(rw, req)
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})
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}
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func (s *DeferredServer) ClusterDialer(clusterID string) func(ctx context.Context, network, address string) (net.Conn, error) {
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return func(ctx context.Context, network, address string) (net.Conn, error) {
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mcm := s.getMCM()
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if mcm == nil {
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return nil, fmt.Errorf("failed to find cluster %s", clusterID)
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}
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dialer, err := mcm.ScaledContext.Dialer.ClusterDialer(clusterID, true)
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if err != nil {
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return nil, err
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}
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return dialer(ctx, network, address)
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}
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}
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func (s *DeferredServer) K8sClient(clusterName string) (kubernetes.Interface, error) {
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mcm := s.getMCM()
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if mcm == nil {
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return nil, nil
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}
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clusterContext, err := mcm.clusterManager.UserContextNoControllers(clusterName)
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if err != nil {
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return nil, err
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}
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return clusterContext.K8sClient, nil
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}
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