mirror of
https://github.com/VictoriaMetrics/VictoriaMetrics.git
synced 2024-12-15 16:30:55 +01:00
115 lines
3.2 KiB
Go
115 lines
3.2 KiB
Go
package kubernetes
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import (
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"encoding/json"
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"fmt"
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)
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// getServicesLabels returns labels for k8s services obtained from the given cfg.
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func getServicesLabels(cfg *APIConfig) ([]map[string]string, error) {
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svcs, err := getServices(cfg)
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if err != nil {
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return nil, err
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}
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var ms []map[string]string
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for _, svc := range svcs {
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ms = svc.appendTargetLabels(ms)
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}
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return ms, nil
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}
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func getServices(cfg *APIConfig) ([]Service, error) {
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data, err := getAPIResponse(cfg, "service", "/api/v1/services")
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if err != nil {
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return nil, fmt.Errorf("cannot obtain services data from API server: %s", err)
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}
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sl, err := parseServiceList(data)
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if err != nil {
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return nil, fmt.Errorf("cannot parse services response from API server: %s", err)
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}
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return sl.Items, nil
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}
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// ServiceList is k8s service list.
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//
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// See https://kubernetes.io/docs/reference/generated/kubernetes-api/v1.17/#servicelist-v1-core
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type ServiceList struct {
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Items []Service
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}
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// Service is k8s service.
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//
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// See https://kubernetes.io/docs/reference/generated/kubernetes-api/v1.17/#service-v1-core
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type Service struct {
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Metadata ObjectMeta
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Spec ServiceSpec
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}
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// ServiceSpec is k8s service spec.
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//
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// See https://kubernetes.io/docs/reference/generated/kubernetes-api/v1.17/#servicespec-v1-core
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type ServiceSpec struct {
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ClusterIP string
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ExternalName string
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Type string
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Ports []ServicePort
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}
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// ServicePort is k8s service port.
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//
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// See https://kubernetes.io/docs/reference/generated/kubernetes-api/v1.17/#serviceport-v1-core
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type ServicePort struct {
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Name string
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Protocol string
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Port int
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}
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// parseServiceList parses ServiceList from data.
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func parseServiceList(data []byte) (*ServiceList, error) {
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var sl ServiceList
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if err := json.Unmarshal(data, &sl); err != nil {
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return nil, fmt.Errorf("cannot unmarshal ServiceList from %q: %s", data, err)
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}
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return &sl, nil
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}
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// appendTargetLabels appends labels for each port of the given Service s to ms and returns the result.
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//
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// See https://prometheus.io/docs/prometheus/latest/configuration/configuration/#service
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func (s *Service) appendTargetLabels(ms []map[string]string) []map[string]string {
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host := fmt.Sprintf("%s.%s.svc", s.Metadata.Name, s.Metadata.Namespace)
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for _, sp := range s.Spec.Ports {
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addr := joinHostPort(host, sp.Port)
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m := map[string]string{
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"__address__": addr,
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"__meta_kubernetes_service_port_name": sp.Name,
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"__meta_kubernetes_service_port_protocol": sp.Protocol,
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}
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s.appendCommonLabels(m)
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ms = append(ms, m)
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}
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return ms
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}
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func (s *Service) appendCommonLabels(m map[string]string) {
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m["__meta_kubernetes_namespace"] = s.Metadata.Namespace
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m["__meta_kubernetes_service_name"] = s.Metadata.Name
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m["__meta_kubernetes_service_type"] = s.Spec.Type
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if s.Spec.Type != "ExternalName" {
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m["__meta_kubernetes_service_cluster_ip"] = s.Spec.ClusterIP
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} else {
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m["__meta_kubernetes_service_external_name"] = s.Spec.ExternalName
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}
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s.Metadata.registerLabelsAndAnnotations("__meta_kubernetes_service", m)
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}
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func getService(svcs []Service, namespace, name string) *Service {
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for i := range svcs {
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svc := &svcs[i]
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if svc.Metadata.Name == name && svc.Metadata.Namespace == namespace {
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return svc
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}
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}
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return nil
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}
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