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healthcheck.go
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healthcheck.go
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package controllers
import (
"context"
"crypto/tls"
"crypto/x509"
"encoding/json"
"fmt"
"io"
"net"
"net/http"
"net/url"
"time"
"github.com/pkg/errors"
clusterv1 "sigs.k8s.io/cluster-api/api/v1beta1"
)
const (
httpClientTimeout = 10 * time.Second
portCheckTimeout = 2 * time.Second
)
type etcdHealthCheckResponse struct {
Health string `json:"health"`
}
type portNotOpenError struct{}
func (h *portNotOpenError) Error() string {
return "etcd endpoint port is not open"
}
var portNotOpenErr = &portNotOpenError{}
func (r *EtcdadmClusterReconciler) performEndpointHealthCheck(ctx context.Context, cluster *clusterv1.Cluster, endpoint string, logLevelInfo bool) error {
client, err := r.getEtcdHttpClient(ctx, cluster)
if err != nil {
return err
}
u, err := url.Parse(endpoint)
if err != nil {
return errors.Wrapf(err, "invalid etcd endpoint url")
}
if !isPortOpen(ctx, u.Host) {
return portNotOpenErr
}
healthCheckURL := getMemberHealthCheckEndpoint(endpoint)
if logLevelInfo {
// logging non-failures only for non-periodic checks so as to not log too many events
r.Log.Info("Performing healthcheck on", "endpoint", healthCheckURL)
}
req, err := http.NewRequest("GET", healthCheckURL, nil)
if err != nil {
return errors.Wrap(err, "error creating healthcheck request")
}
resp, err := client.Do(req)
if err != nil {
return errors.Wrap(err, "error checking etcd member health")
}
// reuse connection
defer resp.Body.Close()
body, err := io.ReadAll(resp.Body)
if err != nil {
return err
}
if resp.StatusCode != http.StatusOK {
return errors.Wrap(err, "Etcd member not ready, retry")
}
if err := parseEtcdHealthCheckOutput(body); err != nil {
return errors.Wrap(err, fmt.Sprintf("etcd member %v failed healthcheck", endpoint))
}
if logLevelInfo {
r.Log.Info("Etcd member ready", "member", endpoint)
}
return nil
}
func parseEtcdHealthCheckOutput(data []byte) error {
obj := etcdHealthCheckResponse{}
if err := json.Unmarshal(data, &obj); err != nil {
return err
}
if obj.Health == "true" {
return nil
}
return fmt.Errorf("/health returned %q", obj.Health)
}
func (r *EtcdadmClusterReconciler) getEtcdHttpClient(ctx context.Context, cluster *clusterv1.Cluster) (*http.Client, error) {
httpClientVal, httpClientExists := r.etcdHealthCheckConfig.clusterToHttpClient.Load(cluster.UID)
if httpClientExists {
httpClient, ok := httpClientVal.(*http.Client)
if ok {
return httpClient, nil
}
}
caCertPool := x509.NewCertPool()
caCert, err := r.getCACert(ctx, cluster)
if err != nil {
return nil, err
}
caCertPool.AppendCertsFromPEM(caCert)
clientCert, err := r.getClientCerts(ctx, cluster)
if err != nil {
return nil, errors.Wrap(err, "Error getting client cert for healthcheck")
}
etcdHttpClient := &http.Client{
Timeout: httpClientTimeout,
Transport: &http.Transport{
TLSClientConfig: &tls.Config{
RootCAs: caCertPool,
Certificates: []tls.Certificate{clientCert},
},
},
}
r.etcdHealthCheckConfig.clusterToHttpClient.Store(cluster.UID, etcdHttpClient)
return etcdHttpClient, nil
}
func isPortOpen(ctx context.Context, endpoint string) bool {
conn, err := net.DialTimeout("tcp", endpoint, portCheckTimeout)
if err != nil {
return false
}
if conn != nil {
conn.Close()
return true
}
return false
}