mirror of https://github.com/k3s-io/k3s
75 lines
2.3 KiB
Go
75 lines
2.3 KiB
Go
package util
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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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"strconv"
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"time"
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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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v1 "k8s.io/api/core/v1"
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"k8s.io/apimachinery/pkg/util/wait"
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clientset "k8s.io/client-go/kubernetes"
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)
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// This sets a default duration to wait for the apiserver to become ready. This is primarily used to
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// block startup of agent supervisor controllers until the apiserver is ready to serve requests, in the
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// same way that the apiReady channel is used in the server packages, so it can be fairly long. It must
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// be at least long enough for downstream projects like RKE2 to start the apiserver in the background.
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const DefaultAPIServerReadyTimeout = 15 * time.Minute
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func GetAddresses(endpoint *v1.Endpoints) []string {
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serverAddresses := []string{}
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if endpoint == nil {
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return serverAddresses
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}
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for _, subset := range endpoint.Subsets {
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var port string
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if len(subset.Ports) > 0 {
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port = strconv.Itoa(int(subset.Ports[0].Port))
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}
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if port == "" {
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port = "443"
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}
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for _, address := range subset.Addresses {
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serverAddresses = append(serverAddresses, net.JoinHostPort(address.IP, port))
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}
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}
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return serverAddresses
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}
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// WaitForAPIServerReady waits for the API Server's /readyz endpoint to report "ok" with timeout.
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// This is modified from WaitForAPIServer from the Kubernetes controller-manager app, but checks the
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// readyz endpoint instead of the deprecated healthz endpoint, and supports context.
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func WaitForAPIServerReady(ctx context.Context, client clientset.Interface, timeout time.Duration) error {
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var lastErr error
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restClient := client.Discovery().RESTClient()
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err := wait.PollImmediateWithContext(ctx, time.Second, timeout, func(ctx context.Context) (bool, error) {
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healthStatus := 0
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result := restClient.Get().AbsPath("/readyz").Do(ctx).StatusCode(&healthStatus)
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if rerr := result.Error(); rerr != nil {
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lastErr = errors.Wrap(rerr, "failed to get apiserver /readyz status")
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return false, nil
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}
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if healthStatus != http.StatusOK {
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content, _ := result.Raw()
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lastErr = fmt.Errorf("APIServer isn't ready: %v", string(content))
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logrus.Warnf("APIServer isn't ready yet: %v. Waiting a little while.", string(content))
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return false, nil
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}
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return true, nil
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})
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if err != nil {
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return merr.NewErrors(err, lastErr)
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}
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return nil
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}
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