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probes.go
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probes.go
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package sidecar
import (
"context"
"fmt"
"net/http"
"time"
"github.com/scylladb/scylla-operator/pkg/controllerhelpers"
"github.com/scylladb/scylla-operator/pkg/naming"
corev1 "k8s.io/client-go/listers/core/v1"
"k8s.io/klog/v2"
)
const (
localhost = "localhost"
)
type Prober struct {
namespace string
serviceName string
serviceLister corev1.ServiceLister
timeout time.Duration
}
func NewProber(
namespace string,
serviceName string,
serviceLister corev1.ServiceLister,
) *Prober {
return &Prober{
namespace: namespace,
serviceName: serviceName,
serviceLister: serviceLister,
timeout: 60 * time.Second,
}
}
func (p *Prober) serviceRef() string {
return fmt.Sprintf("%s/%s", p.namespace, p.serviceName)
}
func (p *Prober) isNodeUnderMaintenance() (bool, error) {
svc, err := p.serviceLister.Services(p.namespace).Get(p.serviceName)
if err != nil {
return false, err
}
_, hasLabel := svc.Labels[naming.NodeMaintenanceLabel]
return hasLabel, nil
}
func (p *Prober) getNodeAddress() (string, error) {
svc, err := p.serviceLister.Services(p.namespace).Get(p.serviceName)
if err != nil {
return "", err
}
return controllerhelpers.GetScyllaIPFromService(svc)
}
func (p *Prober) Readyz(w http.ResponseWriter, req *http.Request) {
ctx, ctxCancel := context.WithTimeout(req.Context(), p.timeout)
defer ctxCancel()
underMaintenance, err := p.isNodeUnderMaintenance()
if err != nil {
w.WriteHeader(http.StatusServiceUnavailable)
klog.ErrorS(err, "readyz probe: can't look up service maintenance label", "Service", p.serviceRef())
return
}
if underMaintenance {
// During maintenance Pod shouldn't be declare to be ready.
w.WriteHeader(http.StatusServiceUnavailable)
klog.V(2).InfoS("readyz probe: node is under maintenance", "Service", p.serviceRef())
return
}
scyllaClient, err := controllerhelpers.NewScyllaClientForLocalhost()
if err != nil {
klog.ErrorS(err, "readyz probe: can't get scylla client", "Service", p.serviceRef())
w.WriteHeader(http.StatusInternalServerError)
return
}
defer scyllaClient.Close()
// Contact Scylla to learn about the status of the member
nodeStatuses, err := scyllaClient.Status(ctx, localhost)
if err != nil {
klog.ErrorS(err, "readyz probe: can't get scylla node status", "Service", p.serviceRef())
w.WriteHeader(http.StatusInternalServerError)
return
}
hostID, err := scyllaClient.GetLocalHostId(ctx, localhost, false)
if err != nil {
klog.ErrorS(err, "readyz probe: can't get host id")
w.WriteHeader(http.StatusInternalServerError)
return
}
for _, s := range nodeStatuses {
klog.V(4).InfoS("readyz probe: node state", "Node", s.Addr, "Status", s.Status, "State", s.State)
if s.HostID == hostID && s.IsUN() {
transportEnabled, err := scyllaClient.IsNativeTransportEnabled(ctx, localhost)
if err != nil {
w.WriteHeader(http.StatusServiceUnavailable)
klog.ErrorS(err, "readyz probe: can't get scylla native transport", "Service", p.serviceRef(), "Node", s.Addr)
return
}
klog.V(4).InfoS("readyz probe: node state", "Node", s.Addr, "NativeTransportEnabled", transportEnabled)
if transportEnabled {
w.WriteHeader(http.StatusOK)
return
}
}
}
klog.V(2).InfoS("readyz probe: node is not ready", "Service", p.serviceRef())
w.WriteHeader(http.StatusServiceUnavailable)
}
func (p *Prober) Healthz(w http.ResponseWriter, req *http.Request) {
ctx, ctxCancel := context.WithTimeout(req.Context(), p.timeout)
defer ctxCancel()
underMaintenance, err := p.isNodeUnderMaintenance()
if err != nil {
w.WriteHeader(http.StatusServiceUnavailable)
klog.ErrorS(err, "healthz probe: can't look up service maintenance label", "Service", p.serviceRef())
return
}
if underMaintenance {
w.WriteHeader(http.StatusOK)
klog.V(2).InfoS("healthz probe: node is under maintenance", "Service", p.serviceRef())
return
}
scyllaClient, err := controllerhelpers.NewScyllaClientForLocalhost()
if err != nil {
klog.ErrorS(err, "healthz probe: can't get scylla client", "Service", p.serviceRef())
w.WriteHeader(http.StatusInternalServerError)
return
}
defer scyllaClient.Close()
// Check if Scylla API is reachable
_, err = scyllaClient.Ping(ctx, localhost)
if err != nil {
klog.ErrorS(err, "healthz probe: can't connect to Scylla API", "Service", p.serviceRef())
w.WriteHeader(http.StatusServiceUnavailable)
return
}
w.WriteHeader(http.StatusOK)
}