func()

in discovery/openstack/instance.go [73:199]

• 115 lines of code
• 24 McCabe index (conditional complexity)

func (i *InstanceDiscovery) refresh(ctx context.Context) ([]*targetgroup.Group, error) {
	i.provider.Context = ctx
	err := openstack.Authenticate(i.provider, *i.authOpts)
	if err != nil {
		return nil, errors.Wrap(err, "could not authenticate to OpenStack")
	}
	client, err := openstack.NewComputeV2(i.provider, gophercloud.EndpointOpts{
		Region: i.region,
	})
	if err != nil {
		return nil, errors.Wrap(err, "could not create OpenStack compute session")
	}

	// OpenStack API reference
	// https://developer.openstack.org/api-ref/compute/#list-floating-ips
	pagerFIP := floatingips.List(client)
	floatingIPList := make(map[floatingIPKey]string)
	floatingIPPresent := make(map[string]struct{})
	err = pagerFIP.EachPage(func(page pagination.Page) (bool, error) {
		result, err := floatingips.ExtractFloatingIPs(page)
		if err != nil {
			return false, errors.Wrap(err, "could not extract floatingips")
		}
		for _, ip := range result {
			// Skip not associated ips
			if ip.InstanceID == "" || ip.FixedIP == "" {
				continue
			}
			floatingIPList[floatingIPKey{id: ip.InstanceID, fixed: ip.FixedIP}] = ip.IP
			floatingIPPresent[ip.IP] = struct{}{}
		}
		return true, nil
	})
	if err != nil {
		return nil, err
	}

	// OpenStack API reference
	// https://developer.openstack.org/api-ref/compute/#list-servers
	opts := servers.ListOpts{
		AllTenants: i.allTenants,
	}
	pager := servers.List(client, opts)
	tg := &targetgroup.Group{
		Source: fmt.Sprintf("OS_" + i.region),
	}
	err = pager.EachPage(func(page pagination.Page) (bool, error) {
		if ctx.Err() != nil {
			return false, errors.Wrap(ctx.Err(), "could not extract instances")
		}
		instanceList, err := servers.ExtractServers(page)
		if err != nil {
			return false, errors.Wrap(err, "could not extract instances")
		}

		for _, s := range instanceList {
			if len(s.Addresses) == 0 {
				level.Info(i.logger).Log("msg", "Got no IP address", "instance", s.ID)
				continue
			}

			labels := model.LabelSet{
				openstackLabelInstanceID:     model.LabelValue(s.ID),
				openstackLabelInstanceStatus: model.LabelValue(s.Status),
				openstackLabelInstanceName:   model.LabelValue(s.Name),
				openstackLabelProjectID:      model.LabelValue(s.TenantID),
				openstackLabelUserID:         model.LabelValue(s.UserID),
			}

			id, ok := s.Flavor["id"].(string)
			if !ok {
				level.Warn(i.logger).Log("msg", "Invalid type for flavor id, expected string")
				continue
			}
			labels[openstackLabelInstanceFlavor] = model.LabelValue(id)
			for k, v := range s.Metadata {
				name := strutil.SanitizeLabelName(k)
				labels[openstackLabelTagPrefix+model.LabelName(name)] = model.LabelValue(v)
			}
			for pool, address := range s.Addresses {
				md, ok := address.([]interface{})
				if !ok {
					level.Warn(i.logger).Log("msg", "Invalid type for address, expected array")
					continue
				}
				if len(md) == 0 {
					level.Debug(i.logger).Log("msg", "Got no IP address", "instance", s.ID)
					continue
				}
				for _, address := range md {
					md1, ok := address.(map[string]interface{})
					if !ok {
						level.Warn(i.logger).Log("msg", "Invalid type for address, expected dict")
						continue
					}
					addr, ok := md1["addr"].(string)
					if !ok {
						level.Warn(i.logger).Log("msg", "Invalid type for address, expected string")
						continue
					}
					if _, ok := floatingIPPresent[addr]; ok {
						continue
					}
					lbls := make(model.LabelSet, len(labels))
					for k, v := range labels {
						lbls[k] = v
					}
					lbls[openstackLabelAddressPool] = model.LabelValue(pool)
					lbls[openstackLabelPrivateIP] = model.LabelValue(addr)
					if val, ok := floatingIPList[floatingIPKey{id: s.ID, fixed: addr}]; ok {
						lbls[openstackLabelPublicIP] = model.LabelValue(val)
					}
					addr = net.JoinHostPort(addr, fmt.Sprintf("%d", i.port))
					lbls[model.AddressLabel] = model.LabelValue(addr)

					tg.Targets = append(tg.Targets, lbls)
				}
			}
		}
		return true, nil
	})
	if err != nil {
		return nil, err
	}

	return []*targetgroup.Group{tg}, nil
}