func()

in discovery/kubernetes/endpoints.go [206:328]
98 lines of code
19 McCabe index (conditional complexity)

func (e *Endpoints) buildEndpoints(eps *apiv1.Endpoints) *targetgroup.Group {
	tg := &targetgroup.Group{
		Source: endpointsSource(eps),
	}
	tg.Labels = model.LabelSet{
		namespaceLabel:     lv(eps.Namespace),
		endpointsNameLabel: lv(eps.Name),
	}
	e.addServiceLabels(eps.Namespace, eps.Name, tg)

	type podEntry struct {
		pod          *apiv1.Pod
		servicePorts []apiv1.EndpointPort
	}
	seenPods := map[string]*podEntry{}

	add := func(addr apiv1.EndpointAddress, port apiv1.EndpointPort, ready string) {
		a := net.JoinHostPort(addr.IP, strconv.FormatUint(uint64(port.Port), 10))

		target := model.LabelSet{
			model.AddressLabel:        lv(a),
			endpointPortNameLabel:     lv(port.Name),
			endpointPortProtocolLabel: lv(string(port.Protocol)),
			endpointReadyLabel:        lv(ready),
		}

		if addr.TargetRef != nil {
			target[model.LabelName(endpointAddressTargetKindLabel)] = lv(addr.TargetRef.Kind)
			target[model.LabelName(endpointAddressTargetNameLabel)] = lv(addr.TargetRef.Name)
		}

		if addr.NodeName != nil {
			target[model.LabelName(endpointNodeName)] = lv(*addr.NodeName)
		}
		if addr.Hostname != "" {
			target[model.LabelName(endpointHostname)] = lv(addr.Hostname)
		}

		pod := e.resolvePodRef(addr.TargetRef)
		if pod == nil {
			// This target is not a Pod, so don't continue with Pod specific logic.
			tg.Targets = append(tg.Targets, target)
			return
		}
		s := pod.Namespace + "/" + pod.Name

		sp, ok := seenPods[s]
		if !ok {
			sp = &podEntry{pod: pod}
			seenPods[s] = sp
		}

		// Attach standard pod labels.
		target = target.Merge(podLabels(pod))

		// Attach potential container port labels matching the endpoint port.
		for _, c := range pod.Spec.Containers {
			for _, cport := range c.Ports {
				if port.Port == cport.ContainerPort {
					ports := strconv.FormatUint(uint64(port.Port), 10)

					target[podContainerNameLabel] = lv(c.Name)
					target[podContainerPortNameLabel] = lv(cport.Name)
					target[podContainerPortNumberLabel] = lv(ports)
					target[podContainerPortProtocolLabel] = lv(string(port.Protocol))
					break
				}
			}
		}

		// Add service port so we know that we have already generated a target
		// for it.
		sp.servicePorts = append(sp.servicePorts, port)
		tg.Targets = append(tg.Targets, target)
	}

	for _, ss := range eps.Subsets {
		for _, port := range ss.Ports {
			for _, addr := range ss.Addresses {
				add(addr, port, "true")
			}
			// Although this generates the same target again, as it was generated in
			// the loop above, it causes the ready meta label to be overridden.
			for _, addr := range ss.NotReadyAddresses {
				add(addr, port, "false")
			}
		}
	}

	// For all seen pods, check all container ports. If they were not covered
	// by one of the service endpoints, generate targets for them.
	for _, pe := range seenPods {
		for _, c := range pe.pod.Spec.Containers {
			for _, cport := range c.Ports {
				hasSeenPort := func() bool {
					for _, eport := range pe.servicePorts {
						if cport.ContainerPort == eport.Port {
							return true
						}
					}
					return false
				}
				if hasSeenPort() {
					continue
				}

				a := net.JoinHostPort(pe.pod.Status.PodIP, strconv.FormatUint(uint64(cport.ContainerPort), 10))
				ports := strconv.FormatUint(uint64(cport.ContainerPort), 10)

				target := model.LabelSet{
					model.AddressLabel:            lv(a),
					podContainerNameLabel:         lv(c.Name),
					podContainerPortNameLabel:     lv(cport.Name),
					podContainerPortNumberLabel:   lv(ports),
					podContainerPortProtocolLabel: lv(string(cport.Protocol)),
				}
				tg.Targets = append(tg.Targets, target.Merge(podLabels(pe.pod)))
			}
		}
	}

	return tg
}