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named_port_index.go
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named_port_index.go
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// Copyright (c) 2016-2018 Tigera, Inc. All rights reserved.
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package labelindex
import (
log "github.com/sirupsen/logrus"
"reflect"
"strings"
"fmt"
"github.com/projectcalico/felix/dispatcher"
"github.com/projectcalico/felix/ip"
"github.com/projectcalico/libcalico-go/lib/backend/api"
"github.com/projectcalico/libcalico-go/lib/backend/model"
"github.com/projectcalico/libcalico-go/lib/numorstring"
"github.com/projectcalico/libcalico-go/lib/selector"
"github.com/projectcalico/libcalico-go/lib/set"
)
// endpointData holds the data that we need to know about a particular endpoint.
type endpointData struct {
labels map[string]string
nets []ip.CIDR
ports []model.EndpointPort
parents []*npParentData
cachedMatchingIPSetIDs set.Set /* or, as an optimization, nil if there are none */
}
func (d *endpointData) AddMatchingIPSetID(id string) {
if d.cachedMatchingIPSetIDs == nil {
d.cachedMatchingIPSetIDs = set.New()
}
d.cachedMatchingIPSetIDs.Add(id)
}
func (d *endpointData) RemoveMatchingIPSetID(id string) {
if d.cachedMatchingIPSetIDs == nil {
return
}
d.cachedMatchingIPSetIDs.Discard(id)
if d.cachedMatchingIPSetIDs.Len() == 0 {
d.cachedMatchingIPSetIDs = nil
}
}
func (d *endpointData) HasParent(parent *npParentData) bool {
for _, p := range d.parents {
if p == parent {
return true
}
}
return false
}
func (d *endpointData) LookupNamedPorts(name string, proto IPSetPortProtocol) []uint16 {
var matchingPorts []uint16
for _, p := range d.ports {
if p.Name == name && proto.MatchesModelProtocol(p.Protocol) {
matchingPorts = append(matchingPorts, p.Port)
}
}
return matchingPorts
}
type IPSetPortProtocol uint8
func (p IPSetPortProtocol) MatchesModelProtocol(protocol numorstring.Protocol) bool {
if protocol.Type == numorstring.NumOrStringNum {
if protocol.NumVal == 0 {
// Special case: named ports default to TCP if protocol isn't specified.
return p == ProtocolTCP
}
return protocol.NumVal == uint8(p)
}
switch p {
case ProtocolTCP:
return strings.ToLower(protocol.StrVal) == "tcp"
case ProtocolUDP:
return strings.ToLower(protocol.StrVal) == "udp"
}
log.WithField("protocol", p).Panic("Unknown protocol")
return false
}
func (p IPSetPortProtocol) String() string {
switch p {
case ProtocolTCP:
return "tcp"
case ProtocolUDP:
return "udp"
case ProtocolNone:
return "none"
default:
return "unknown"
}
}
const (
ProtocolNone IPSetPortProtocol = 0
ProtocolTCP IPSetPortProtocol = 6
ProtocolUDP IPSetPortProtocol = 17
)
type IPSetMember struct {
CIDR ip.CIDR
Protocol IPSetPortProtocol
PortNumber uint16
}
type ipSetData struct {
// The selector and named port that this IP set represents. If the selector is nil then
// this IP set represents an unfiltered named port. If namedPortProtocol == ProtocolNone then
// this IP set represents a selector only, with no named port component.
selector selector.Selector
namedPortProtocol IPSetPortProtocol
namedPort string
// memberToRefCount stores a reference count for each member in the IP set. Reference counts
// may be >1 if an IP address is shared by more than one endpoint.
memberToRefCount map[IPSetMember]uint64
}
// Get implements the Labels interface for endpointData. Combines the endpoint's own labels with
// those of its parents on the fly. This reduces the number of allocations we need to do and
// it's fast in the mainline case (where there are 0-1 parents).
func (endpointData *endpointData) Get(labelName string) (value string, present bool) {
if value, present = endpointData.labels[labelName]; present {
return
}
for _, parent := range endpointData.parents {
if value, present = parent.labels[labelName]; present {
return
}
for _, tag := range parent.tags {
if tag == labelName {
present = true
return
}
}
}
return
}
// npParentData holds the data that we know about each parent (i.e. each security profile). Since,
// profiles consist of multiple resources in our data-model, the labels or tags fields may be nil
// if we have partial information.
type npParentData struct {
id string
labels map[string]string
tags []string
referenceCount uint64
}
type NamedPortMatchCallback func(ipSetID string, member IPSetMember)
type SelectorAndNamedPortIndex struct {
endpointDataByID map[interface{}]*endpointData
parentDataByParentID map[string]*npParentData
ipSetDataByID map[string]*ipSetData
// Callback functions
OnMemberAdded NamedPortMatchCallback
OnMemberRemoved NamedPortMatchCallback
}
func NewSelectorAndNamedPortIndex() *SelectorAndNamedPortIndex {
inheritIdx := SelectorAndNamedPortIndex{
endpointDataByID: map[interface{}]*endpointData{},
parentDataByParentID: map[string]*npParentData{},
ipSetDataByID: map[string]*ipSetData{},
// Callback functions
OnMemberAdded: func(ipSetID string, member IPSetMember) {},
OnMemberRemoved: func(ipSetID string, member IPSetMember) {},
}
return &inheritIdx
}
func (idx *SelectorAndNamedPortIndex) RegisterWith(allUpdDispatcher *dispatcher.Dispatcher) {
allUpdDispatcher.Register(model.ProfileTagsKey{}, idx.OnUpdate)
allUpdDispatcher.Register(model.ProfileLabelsKey{}, idx.OnUpdate)
allUpdDispatcher.Register(model.WorkloadEndpointKey{}, idx.OnUpdate)
allUpdDispatcher.Register(model.HostEndpointKey{}, idx.OnUpdate)
allUpdDispatcher.Register(model.NetworkSetKey{}, idx.OnUpdate)
}
// OnUpdate makes SelectorAndNamedPortIndex compatible with the Dispatcher. It accepts
// updates for endpoints and profiles and passes them through to the Update/DeleteXXX methods.
func (idx *SelectorAndNamedPortIndex) OnUpdate(update api.Update) (_ bool) {
switch key := update.Key.(type) {
case model.WorkloadEndpointKey:
if update.Value != nil {
log.Debugf("Updating NamedPortIndex with endpoint %v", key)
endpoint := update.Value.(*model.WorkloadEndpoint)
profileIDs := endpoint.ProfileIDs
idx.UpdateEndpointOrSet(
key,
endpoint.Labels,
extractCIDRsFromWorkloadEndpoint(endpoint),
endpoint.Ports,
profileIDs)
} else {
log.Debugf("Deleting endpoint %v from NamedPortIndex", key)
idx.DeleteEndpoint(key)
}
case model.HostEndpointKey:
if update.Value != nil {
// Figure out what's changed and update the cache.
log.Debugf("Updating NamedPortIndex for host endpoint %v", key)
endpoint := update.Value.(*model.HostEndpoint)
profileIDs := endpoint.ProfileIDs
idx.UpdateEndpointOrSet(
key,
endpoint.Labels,
extractCIDRsFromHostEndpoint(endpoint),
endpoint.Ports,
profileIDs)
} else {
log.Debugf("Deleting host endpoint %v from NamedPortIndex", key)
idx.DeleteEndpoint(key)
}
case model.NetworkSetKey:
if update.Value != nil {
// Figure out what's changed and update the cache.
log.Debugf("Updating NamedPortIndex for network set %v", key)
netSet := update.Value.(*model.NetworkSet)
idx.UpdateEndpointOrSet(
key,
netSet.Labels,
extractCIDRsFromNetworkSet(netSet),
nil,
nil)
} else {
log.Debugf("Deleting network set %v from NamedPortIndex", key)
idx.DeleteEndpoint(key)
}
case model.ProfileLabelsKey:
if update.Value != nil {
log.Debugf("Updating NamedPortIndex for profile labels %v", key)
labels := update.Value.(map[string]string)
idx.UpdateParentLabels(key.Name, labels)
} else {
log.Debugf("Removing profile labels %v from NamedPortIndex", key)
idx.DeleteParentLabels(key.Name)
}
case model.ProfileTagsKey:
if update.Value != nil {
log.Debugf("Updating NamedPortIndex for profile tags %v", key)
labels := update.Value.([]string)
idx.UpdateParentTags(key.Name, labels)
} else {
log.Debugf("Removing profile tags %v from NamedPortIndex", key)
idx.DeleteParentTags(key.Name)
}
}
return
}
// extractCIDRsFromHostEndpoint converts the expected IPs of the host endpoint into /32 and /128
// CIDRs.
func extractCIDRsFromHostEndpoint(endpoint *model.HostEndpoint) []ip.CIDR {
v4Addrs := endpoint.ExpectedIPv4Addrs
v6Addrs := endpoint.ExpectedIPv6Addrs
combined := make([]ip.CIDR, 0, len(v4Addrs)+len(v6Addrs))
for _, addr := range v4Addrs {
combined = append(combined, ip.FromNetIP(addr.IP).AsCIDR())
}
for _, addr := range v6Addrs {
combined = append(combined, ip.FromNetIP(addr.IP).AsCIDR())
}
return combined
}
// extractCIDRsFromWorkloadEndpoint converts the IPv[46]Nets fields of the WorkloadEndpoint into
// /32 and /128 CIDRs. It ignores any prefix length (but our validation ensures those nets are
// /32s or /128s in any case).
func extractCIDRsFromWorkloadEndpoint(endpoint *model.WorkloadEndpoint) []ip.CIDR {
v4Nets := endpoint.IPv4Nets
v6Nets := endpoint.IPv6Nets
combined := make([]ip.CIDR, 0, len(v4Nets)+len(v6Nets))
for _, addr := range v4Nets {
combined = append(combined, ip.CIDRFromNetIP(addr.IP))
}
for _, addr := range v6Nets {
combined = append(combined, ip.CIDRFromNetIP(addr.IP))
}
return combined
}
// extractCIDRsFromNetworkSet converts the Nets field of the NetworkSet into an []ip.CIDR slice.
func extractCIDRsFromNetworkSet(netSet *model.NetworkSet) []ip.CIDR {
a := netSet.Nets
combined := make([]ip.CIDR, 0, len(a))
for _, addr := range a {
cidr := ip.CIDRFromCalicoNet(addr)
if cidr.Prefix() == 0 {
// Special case: the linux dataplane can't handle 0-length CIDRs so we split it into
// multiple CIDRs. Note: if the /1s were also in the network set, the deduplication is
// handled by reference counting in the ipSetData struct.
log.Debug("Converting 0 length CIDR to pair of /1s")
switch cidr.Version() {
case 4:
combined = append(combined,
ip.MustParseCIDROrIP("0.0.0.0/1"),
ip.MustParseCIDROrIP("128.0.0.0/1"),
)
case 6:
combined = append(combined,
ip.MustParseCIDROrIP("::/1"),
ip.MustParseCIDROrIP("8000::/1"),
)
default:
log.WithField("cidr", cidr).Panic("Unknown IP version")
}
} else {
// Normal case, just append the single CIDR.
combined = append(combined, cidr)
}
}
return combined
}
func (idx *SelectorAndNamedPortIndex) UpdateIPSet(ipSetID string, sel selector.Selector, namedPortProtocol IPSetPortProtocol, namedPort string) {
logCxt := log.WithFields(log.Fields{
"ipSetID": ipSetID,
"selector": sel,
"namedPort": namedPort,
"namedPortProtocol": namedPortProtocol,
})
logCxt.Debug("Updating IP set")
if sel == nil {
log.WithField("id", ipSetID).Panic("Selector should not be nil")
}
// Check whether anything has actually changed before we do a scan.
oldIPSetData := idx.ipSetDataByID[ipSetID]
if oldIPSetData != nil {
if oldIPSetData.selector.UniqueID() == sel.UniqueID() &&
oldIPSetData.namedPortProtocol == namedPortProtocol &&
oldIPSetData.namedPort == namedPort {
// Spurious refresh of existing IP set.
logCxt.Debug("Skipping unchanged IP set")
return
}
// This case indicates a change to the selector or named port without a change to the ID,
// which isn't currently possible in Felix, since the ID is formed by hashing the other
// values. For completeness, handle (inefficiently) by simulating a deletion.
log.WithField("ipSetID", ipSetID).Warn("IP set selector or named port changed for existing ID.")
idx.DeleteIPSet(ipSetID)
}
// If we get here, we have a new IP set and we need to do a full scan of all endpoints.
newIPSetData := &ipSetData{
selector: sel,
namedPort: namedPort,
namedPortProtocol: namedPortProtocol,
memberToRefCount: map[IPSetMember]uint64{},
}
idx.ipSetDataByID[ipSetID] = newIPSetData
// Then scan all endpoints.
for epID, epData := range idx.endpointDataByID {
if !sel.EvaluateLabels(epData) {
// Endpoint doesn't match.
continue
}
contrib := idx.CalculateEndpointContribution(epData, newIPSetData)
if len(contrib) == 0 {
continue
}
if log.GetLevel() >= log.DebugLevel {
logCxt = logCxt.WithField("epID", epID)
logCxt.Debug("Endpoint contributes to IP set")
}
epData.AddMatchingIPSetID(ipSetID)
for _, member := range contrib {
refCount := newIPSetData.memberToRefCount[member]
if refCount == 0 {
if log.GetLevel() >= log.DebugLevel {
logCxt.WithField("member", member).Debug("New IP set member")
}
idx.OnMemberAdded(ipSetID, member)
}
newIPSetData.memberToRefCount[member] = refCount + 1
}
}
}
func (idx *SelectorAndNamedPortIndex) DeleteIPSet(id string) {
log.WithField("ipSetID", id).Info("Deleting IP set")
ipSetData := idx.ipSetDataByID[id]
if ipSetData == nil {
log.WithField("id", id).Warning("Delete of unknown IP set, ignoring")
return
}
// Emit events for all the removed CIDRs.
for member := range ipSetData.memberToRefCount {
if log.GetLevel() >= log.DebugLevel {
log.WithField("member", member).Debug("Emitting deletion event.")
}
idx.OnMemberRemoved(id, member)
}
// Then scan all endpoints and fix up their indexes to remove the match.
for _, epData := range idx.endpointDataByID {
epData.RemoveMatchingIPSetID(id)
}
delete(idx.ipSetDataByID, id)
}
func (idx *SelectorAndNamedPortIndex) UpdateEndpointOrSet(
id interface{},
labels map[string]string,
nets []ip.CIDR,
ports []model.EndpointPort,
parentIDs []string,
) {
var cidrsToLog interface{} = nets
if log.GetLevel() < log.DebugLevel && len(nets) > 20 {
cidrsToLog = fmt.Sprintf("<too many to log (%d)>", len(nets))
}
logCxt := log.WithFields(log.Fields{
"endpointOrSetID": id,
"newLabels": labels,
"CIDRs": cidrsToLog,
"ports": ports,
"parentIDs": parentIDs,
})
logCxt.Debug("Updating endpoint/network set")
// Calculate the new endpoint data.
newEndpointData := &endpointData{}
if len(labels) > 0 {
newEndpointData.labels = labels
}
if len(parentIDs) > 0 {
parents := make([]*npParentData, len(parentIDs))
for i, pID := range parentIDs {
parents[i] = idx.getOrCreateParent(pID)
}
newEndpointData.parents = parents
}
if len(nets) > 0 {
newEndpointData.nets = nets
}
if len(ports) > 0 {
newEndpointData.ports = ports
}
// Get the old endpoint data so we can compare it.
oldEndpointData := idx.endpointDataByID[id]
var oldIPSetContributions map[string][]IPSetMember
if oldEndpointData != nil {
// Before we do the (potentially expensive) selector scan, check if there can possibly be a
// change.
if reflect.DeepEqual(oldEndpointData.labels, newEndpointData.labels) &&
reflect.DeepEqual(oldEndpointData.ports, newEndpointData.ports) &&
reflect.DeepEqual(oldEndpointData.nets, newEndpointData.nets) &&
reflect.DeepEqual(oldEndpointData.parents, newEndpointData.parents) {
log.Debug("Endpoint update makes no changes, skipping.")
return
}
// If we get here, something about the endpoint has changed. Calculate the old endpoint's
// contribution to the IP sets that it matched.
oldIPSetContributions = idx.RecalcCachedContributions(oldEndpointData)
}
// Calculate and compare the contribution of the new endpoint to IP sets. Emit events for
// new contributions and then mop up deletions.
idx.scanEndpointAgainstAllIPSets(newEndpointData, oldIPSetContributions)
// Record the new endpoint data.
idx.endpointDataByID[id] = newEndpointData
for _, parent := range newEndpointData.parents {
parent.referenceCount++
}
if oldEndpointData != nil {
for _, parent := range oldEndpointData.parents {
parent.referenceCount--
idx.discardParentIfEmpty(parent.id)
}
}
}
func (idx *SelectorAndNamedPortIndex) scanEndpointAgainstAllIPSets(
epData *endpointData,
oldIPSetContributions map[string][]IPSetMember,
) {
for ipSetID, ipSetData := range idx.ipSetDataByID {
// Remove any previous match from the endpoint's cache. We'll re-add it below if the match
// is still correct. (This is a no-op when we're called from UpdateEndpointOrSet(), which always
// creates a new endpointData struct.)
epData.RemoveMatchingIPSetID(ipSetID)
if ipSetData.selector.EvaluateLabels(epData) {
newIPSetContribution := idx.CalculateEndpointContribution(epData, ipSetData)
if len(newIPSetContribution) > 0 {
// Record the match in the index. This allows us to quickly recalculate the
// contribution of this endpoint later.
epData.AddMatchingIPSetID(ipSetID)
// Incref all the new members. If any of them go from 0 to 1 reference then we
// know that they're new. We'll temporarily double-count members that were already
// present, then decref them below.
//
// This reference counting also allows us to tolerate duplicate members in the
// input data.
for _, newMember := range newIPSetContribution {
newRefCount := ipSetData.memberToRefCount[newMember] + 1
if newRefCount == 1 {
// New member in the IP set.
idx.OnMemberAdded(ipSetID, newMember)
}
ipSetData.memberToRefCount[newMember] = newRefCount
}
}
}
// Decref all the old members. If they hit 0 references, then the member has been
// removed so we emit an event.
for _, oldMember := range oldIPSetContributions[ipSetID] {
newRefCount := ipSetData.memberToRefCount[oldMember] - 1
if newRefCount == 0 {
// Member no longer in the IP set. Emit event and clean up the old reference
// count.
idx.OnMemberRemoved(ipSetID, oldMember)
delete(ipSetData.memberToRefCount, oldMember)
} else {
ipSetData.memberToRefCount[oldMember] = newRefCount
}
}
}
}
func (idx *SelectorAndNamedPortIndex) DeleteEndpoint(id interface{}) {
log.Debug("SelectorAndNamedPortIndex deleting endpoint", id)
oldEndpointData := idx.endpointDataByID[id]
if oldEndpointData == nil {
return
}
oldIPSetContributions := idx.RecalcCachedContributions(oldEndpointData)
for ipSetID, contributions := range oldIPSetContributions {
// Decref all the old members. If they hit 0 references, then the member has been
// removed so we emit an event.
log.WithField("ipSetID", ipSetID).Debug("Removing endpoint from IP set")
ipSetData := idx.ipSetDataByID[ipSetID]
for _, oldMember := range contributions {
newRefCount := ipSetData.memberToRefCount[oldMember] - 1
if newRefCount == 0 {
// Member no longer in the IP set. Emit event and clean up the old reference
// count.
idx.OnMemberRemoved(ipSetID, oldMember)
delete(ipSetData.memberToRefCount, oldMember)
} else {
ipSetData.memberToRefCount[oldMember] = newRefCount
}
}
}
// Record the new endpoint data.
delete(idx.endpointDataByID, id)
for _, parent := range oldEndpointData.parents {
parent.referenceCount--
idx.discardParentIfEmpty(parent.id)
}
}
func (idx *SelectorAndNamedPortIndex) UpdateParentLabels(parentID string, labels map[string]string) {
parentData := idx.getOrCreateParent(parentID)
if reflect.DeepEqual(parentData.labels, labels) {
log.WithField("parentID", parentID).Debug("Skipping no-op update to parent labels")
return
}
oldLabels := parentData.labels
idx.updateParent(
parentData,
// Function to apply the update.
func() {
parentData.labels = labels
},
// Function to back out the update.
func() {
parentData.labels = oldLabels
},
)
}
func (idx *SelectorAndNamedPortIndex) UpdateParentTags(parentID string, tags []string) {
parentData := idx.getOrCreateParent(parentID)
if reflect.DeepEqual(parentData.tags, tags) {
log.WithField("parentID", parentID).Debug("Skipping no-op update to parent labels")
return
}
oldTags := parentData.tags
idx.updateParent(
parentData,
// Function to apply the update.
func() {
parentData.tags = tags
},
// Function to back out the update.
func() {
parentData.tags = oldTags
},
)
}
func (idx *SelectorAndNamedPortIndex) updateParent(parentData *npParentData, applyUpdate, revertUpdate func()) {
for _, epData := range idx.endpointDataByID {
if !epData.HasParent(parentData) {
continue
}
// This endpoint matches this parent, calculate its old contribution. (The revert function
// is a no-op on the first loop but keeping it here, rather than at the bottom of the loop
// makes it harder to accidentally skip it with a well-intentioned "continue".)
revertUpdate()
oldIPSetContributions := idx.RecalcCachedContributions(epData)
// Apply the update to the parent while we calculate this endpoint's new contribution.
applyUpdate()
idx.scanEndpointAgainstAllIPSets(epData, oldIPSetContributions)
}
// Defensive: make sure we leave the update applied to the parent.
applyUpdate()
}
func (idx *SelectorAndNamedPortIndex) DeleteParentLabels(parentID string) {
// Defer to the update function, which implements the endpoint scanning logic.
idx.UpdateParentLabels(parentID, nil)
idx.discardParentIfEmpty(parentID)
}
// CalculateEndpointContribution calculates the given endpoint's contribution to the given IP set.
// If the IP set represents a named port then the returned members will have a named port component.
// Returns nil if the endpoint doesn't contribute to the IP set.
func (idx *SelectorAndNamedPortIndex) CalculateEndpointContribution(d *endpointData, ipSetData *ipSetData) (contrib []IPSetMember) {
if ipSetData.namedPortProtocol != ProtocolNone {
// This IP set represents a named port match, calculate the cross product of
// matching named ports by IP address.
portNumbers := d.LookupNamedPorts(ipSetData.namedPort, ipSetData.namedPortProtocol)
for _, namedPort := range portNumbers {
for _, addr := range d.nets {
contrib = append(contrib, IPSetMember{
CIDR: addr,
Protocol: ipSetData.namedPortProtocol,
PortNumber: namedPort,
})
}
}
} else {
// Non-named port match, simply return the CIDRs.
for _, addr := range d.nets {
contrib = append(contrib, IPSetMember{
CIDR: addr,
})
}
}
return
}
// RecalcCachedContributions uses the cached set of matching IP set IDs in the endpoint
// struct to quickly recalculate the endpoint's contribution to all IP sets.
func (idx *SelectorAndNamedPortIndex) RecalcCachedContributions(epData *endpointData) map[string][]IPSetMember {
if epData.cachedMatchingIPSetIDs == nil {
return nil
}
contrib := map[string][]IPSetMember{}
epData.cachedMatchingIPSetIDs.Iter(func(item interface{}) error {
ipSetID := item.(string)
ipSetData := idx.ipSetDataByID[ipSetID]
contrib[ipSetID] = idx.CalculateEndpointContribution(epData, ipSetData)
return nil
})
return contrib
}
func (idx *SelectorAndNamedPortIndex) DeleteParentTags(parentID string) {
idx.UpdateParentTags(parentID, nil)
idx.discardParentIfEmpty(parentID)
}
func (idx *SelectorAndNamedPortIndex) getOrCreateParent(id string) *npParentData {
parent := idx.parentDataByParentID[id]
if parent == nil {
parent = &npParentData{
id: id,
}
idx.parentDataByParentID[id] = parent
}
return parent
}
func (idx *SelectorAndNamedPortIndex) discardParentIfEmpty(id string) {
parent := idx.parentDataByParentID[id]
if parent == nil {
return
}
if parent.referenceCount == 0 && parent.labels == nil && parent.tags == nil {
delete(idx.parentDataByParentID, id)
}
}