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Split ServicePort/Endpoint from ServiceChangeTracker/EndpointsChangeTracker

Browse Source 
Move the ServicePort/BaseServicePortInfo types to serviceport.go.
Move the Endpoint/BaseEndpointInfo types to endpoint.go.

To avoid confusion with the new filenames, rename service.go to
servicechangetracker.go and endpoints.go to endpointschangetracker.go.

(No code changes; this just moves some code from types.go and
services.go to serviceport.go, and some code from types.go and
endpoints.go to endpoint.go.)
This commit is contained in:
Dan Winship 2023-11-15 11:33:24 -05:00
parent ede0dc1d07
commit a73b275031
7 changed files with 430 additions and 389 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

138
pkg/proxy/endpoint.go Normal file
View File

@ -0,0 +1,138 @@
/*
Copyright 2017 The Kubernetes Authors.
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 proxy
import (
"net"
"strconv"
"k8s.io/apimachinery/pkg/util/sets"
)
// Endpoint in an interface which abstracts information about an endpoint.
type Endpoint interface {
// String returns endpoint string. An example format can be: `IP:Port`.
// We take the returned value as ServiceEndpoint.Endpoint.
String() string
// IP returns IP part of the endpoint.
IP() string
// Port returns the Port part of the endpoint.
Port() int
// IsLocal returns true if the endpoint is running on the same host as kube-proxy.
IsLocal() bool
// IsReady returns true if an endpoint is ready and not terminating, or
// if PublishNotReadyAddresses is set on the service.
IsReady() bool
// IsServing returns true if an endpoint is ready. It does not account
// for terminating state.
IsServing() bool
// IsTerminating returns true if an endpoint is terminating. For pods,
// that is any pod with a deletion timestamp.
IsTerminating() bool
// ZoneHints returns the zone hint for the endpoint. This is based on
// endpoint.hints.forZones[0].name in the EndpointSlice API.
ZoneHints() sets.Set[string]
}
// BaseEndpointInfo contains base information that defines an endpoint.
// This could be used directly by proxier while processing endpoints,
// or can be used for constructing a more specific EndpointInfo struct
// defined by the proxier if needed.
type BaseEndpointInfo struct {
// Cache this values to improve performance
ip string
port int
// endpoint is the same as net.JoinHostPort(ip,port)
endpoint string
// isLocal indicates whether the endpoint is running on same host as kube-proxy.
isLocal bool
// ready indicates whether this endpoint is ready and NOT terminating, unless
// PublishNotReadyAddresses is set on the service, in which case it will just
// always be true.
ready bool
// serving indicates whether this endpoint is ready regardless of its terminating state.
// For pods this is true if it has a ready status regardless of its deletion timestamp.
serving bool
// terminating indicates whether this endpoint is terminating.
// For pods this is true if it has a non-nil deletion timestamp.
terminating bool
// zoneHints represent the zone hints for the endpoint. This is based on
// endpoint.hints.forZones[*].name in the EndpointSlice API.
zoneHints sets.Set[string]
}
var _ Endpoint = &BaseEndpointInfo{}
// String is part of proxy.Endpoint interface.
func (info *BaseEndpointInfo) String() string {
return info.endpoint
}
// IP returns just the IP part of the endpoint, it's a part of proxy.Endpoint interface.
func (info *BaseEndpointInfo) IP() string {
return info.ip
}
// Port returns just the Port part of the endpoint.
func (info *BaseEndpointInfo) Port() int {
return info.port
}
// IsLocal is part of proxy.Endpoint interface.
func (info *BaseEndpointInfo) IsLocal() bool {
return info.isLocal
}
// IsReady returns true if an endpoint is ready and not terminating.
func (info *BaseEndpointInfo) IsReady() bool {
return info.ready
}
// IsServing returns true if an endpoint is ready, regardless of if the
// endpoint is terminating.
func (info *BaseEndpointInfo) IsServing() bool {
return info.serving
}
// IsTerminating retruns true if an endpoint is terminating. For pods,
// that is any pod with a deletion timestamp.
func (info *BaseEndpointInfo) IsTerminating() bool {
return info.terminating
}
// ZoneHints returns the zone hint for the endpoint.
func (info *BaseEndpointInfo) ZoneHints() sets.Set[string] {
return info.zoneHints
}
func newBaseEndpointInfo(ip string, port int, isLocal, ready, serving, terminating bool, zoneHints sets.Set[string]) *BaseEndpointInfo {
return &BaseEndpointInfo{
ip: ip,
port: port,
endpoint: net.JoinHostPort(ip, strconv.Itoa(port)),
isLocal: isLocal,
ready: ready,
serving: serving,
terminating: terminating,
zoneHints: zoneHints,
}
}

94
pkg/proxy/endpoints.go → pkg/proxy/endpointschangetracker.go
View File

@ -17,18 +17,15 @@ limitations under the License.
package proxy
import (
"net"
"strconv"
"sync"
"time"
"k8s.io/client-go/tools/events"
"k8s.io/klog/v2"
v1 "k8s.io/api/core/v1"
discovery "k8s.io/api/discovery/v1"
"k8s.io/apimachinery/pkg/types"
"k8s.io/apimachinery/pkg/util/sets"
"k8s.io/client-go/tools/events"
"k8s.io/klog/v2"
"k8s.io/kubernetes/pkg/proxy/metrics"
)
@ -37,93 +34,6 @@ var supportedEndpointSliceAddressTypes = sets.New[string](
string(discovery.AddressTypeIPv6),
)
// BaseEndpointInfo contains base information that defines an endpoint.
// This could be used directly by proxier while processing endpoints,
// or can be used for constructing a more specific EndpointInfo struct
// defined by the proxier if needed.
type BaseEndpointInfo struct {
// Cache this values to improve performance
ip string
port int
// endpoint is the same as net.JoinHostPort(ip,port)
endpoint string
// isLocal indicates whether the endpoint is running on same host as kube-proxy.
isLocal bool
// ready indicates whether this endpoint is ready and NOT terminating, unless
// PublishNotReadyAddresses is set on the service, in which case it will just
// always be true.
ready bool
// serving indicates whether this endpoint is ready regardless of its terminating state.
// For pods this is true if it has a ready status regardless of its deletion timestamp.
serving bool
// terminating indicates whether this endpoint is terminating.
// For pods this is true if it has a non-nil deletion timestamp.
terminating bool
// zoneHints represent the zone hints for the endpoint. This is based on
// endpoint.hints.forZones[*].name in the EndpointSlice API.
zoneHints sets.Set[string]
}
var _ Endpoint = &BaseEndpointInfo{}
// String is part of proxy.Endpoint interface.
func (info *BaseEndpointInfo) String() string {
return info.endpoint
}
// IP returns just the IP part of the endpoint, it's a part of proxy.Endpoint interface.
func (info *BaseEndpointInfo) IP() string {
return info.ip
}
// Port returns just the Port part of the endpoint.
func (info *BaseEndpointInfo) Port() int {
return info.port
}
// IsLocal is part of proxy.Endpoint interface.
func (info *BaseEndpointInfo) IsLocal() bool {
return info.isLocal
}
// IsReady returns true if an endpoint is ready and not terminating.
func (info *BaseEndpointInfo) IsReady() bool {
return info.ready
}
// IsServing returns true if an endpoint is ready, regardless of if the
// endpoint is terminating.
func (info *BaseEndpointInfo) IsServing() bool {
return info.serving
}
// IsTerminating retruns true if an endpoint is terminating. For pods,
// that is any pod with a deletion timestamp.
func (info *BaseEndpointInfo) IsTerminating() bool {
return info.terminating
}
// ZoneHints returns the zone hint for the endpoint.
func (info *BaseEndpointInfo) ZoneHints() sets.Set[string] {
return info.zoneHints
}
func newBaseEndpointInfo(ip string, port int, isLocal, ready, serving, terminating bool, zoneHints sets.Set[string]) *BaseEndpointInfo {
return &BaseEndpointInfo{
ip: ip,
port: port,
endpoint: net.JoinHostPort(ip, strconv.Itoa(port)),
isLocal: isLocal,
ready: ready,
serving: serving,
terminating: terminating,
zoneHints: zoneHints,
}
}
type makeEndpointFunc func(info *BaseEndpointInfo, svcPortName *ServicePortName) Endpoint
// This handler is invoked by the apply function on every change. This function should not modify the

0
pkg/proxy/endpoints_test.go → pkg/proxy/endpointschangetracker_test.go
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247
pkg/proxy/servicechangetracker.go Normal file
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@ -0,0 +1,247 @@
/*
Copyright 2017 The Kubernetes Authors.
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 proxy
import (
"reflect"
"sync"
v1 "k8s.io/api/core/v1"
"k8s.io/apimachinery/pkg/types"
"k8s.io/apimachinery/pkg/util/sets"
"k8s.io/client-go/tools/events"
"k8s.io/klog/v2"
"k8s.io/kubernetes/pkg/proxy/metrics"
proxyutil "k8s.io/kubernetes/pkg/proxy/util"
)
type makeServicePortFunc func(*v1.ServicePort, *v1.Service, *BaseServicePortInfo) ServicePort
// This handler is invoked by the apply function on every change. This function should not modify the
// ServicePortMap's but just use the changes for any Proxier specific cleanup.
type processServiceMapChangeFunc func(previous, current ServicePortMap)
// serviceChange contains all changes to services that happened since proxy rules were synced. For a single object,
// changes are accumulated, i.e. previous is state from before applying the changes,
// current is state after applying all of the changes.
type serviceChange struct {
previous ServicePortMap
current ServicePortMap
}
// ServiceChangeTracker carries state about uncommitted changes to an arbitrary number of
// Services, keyed by their namespace and name.
type ServiceChangeTracker struct {
// lock protects items.
lock sync.Mutex
// items maps a service to its serviceChange.
items map[types.NamespacedName]*serviceChange
// makeServiceInfo allows proxier to inject customized information when processing service.
makeServiceInfo makeServicePortFunc
processServiceMapChange processServiceMapChangeFunc
ipFamily v1.IPFamily
recorder events.EventRecorder
}
// NewServiceChangeTracker initializes a ServiceChangeTracker
func NewServiceChangeTracker(makeServiceInfo makeServicePortFunc, ipFamily v1.IPFamily, recorder events.EventRecorder, processServiceMapChange processServiceMapChangeFunc) *ServiceChangeTracker {
return &ServiceChangeTracker{
items: make(map[types.NamespacedName]*serviceChange),
makeServiceInfo: makeServiceInfo,
recorder: recorder,
ipFamily: ipFamily,
processServiceMapChange: processServiceMapChange,
}
}
// Update updates given service's change map based on the <previous, current> service pair. It returns true if items changed,
// otherwise return false. Update can be used to add/update/delete items of ServiceChangeMap. For example,
// Add item
// - pass <nil, service> as the <previous, current> pair.
//
// Update item
// - pass <oldService, service> as the <previous, current> pair.
//
// Delete item
// - pass <service, nil> as the <previous, current> pair.
func (sct *ServiceChangeTracker) Update(previous, current *v1.Service) bool {
// This is unexpected, we should return false directly.
if previous == nil && current == nil {
return false
}
svc := current
if svc == nil {
svc = previous
}
metrics.ServiceChangesTotal.Inc()
namespacedName := types.NamespacedName{Namespace: svc.Namespace, Name: svc.Name}
sct.lock.Lock()
defer sct.lock.Unlock()
change, exists := sct.items[namespacedName]
if !exists {
change = &serviceChange{}
change.previous = sct.serviceToServiceMap(previous)
sct.items[namespacedName] = change
}
change.current = sct.serviceToServiceMap(current)
// if change.previous equal to change.current, it means no change
if reflect.DeepEqual(change.previous, change.current) {
delete(sct.items, namespacedName)
} else {
klog.V(4).InfoS("Service updated ports", "service", klog.KObj(svc), "portCount", len(change.current))
}
metrics.ServiceChangesPending.Set(float64(len(sct.items)))
return len(sct.items) > 0
}
// UpdateServiceMapResult is the updated results after applying service changes.
type UpdateServiceMapResult struct {
// UpdatedServices lists the names of all services added/updated/deleted since the
// last Update.
UpdatedServices sets.Set[types.NamespacedName]
// DeletedUDPClusterIPs holds stale (no longer assigned to a Service) Service IPs
// that had UDP ports. Callers can use this to abort timeout-waits or clear
// connection-tracking information.
DeletedUDPClusterIPs sets.Set[string]
}
// HealthCheckNodePorts returns a map of Service names to HealthCheckNodePort values
// for all Services in sm with non-zero HealthCheckNodePort.
func (sm ServicePortMap) HealthCheckNodePorts() map[types.NamespacedName]uint16 {
// TODO: If this will appear to be computationally expensive, consider
// computing this incrementally similarly to svcPortMap.
ports := make(map[types.NamespacedName]uint16)
for svcPortName, info := range sm {
if info.HealthCheckNodePort() != 0 {
ports[svcPortName.NamespacedName] = uint16(info.HealthCheckNodePort())
}
}
return ports
}
// ServicePortMap maps a service to its ServicePort.
type ServicePortMap map[ServicePortName]ServicePort
// serviceToServiceMap translates a single Service object to a ServicePortMap.
//
// NOTE: service object should NOT be modified.
func (sct *ServiceChangeTracker) serviceToServiceMap(service *v1.Service) ServicePortMap {
if service == nil {
return nil
}
if proxyutil.ShouldSkipService(service) {
return nil
}
clusterIP := proxyutil.GetClusterIPByFamily(sct.ipFamily, service)
if clusterIP == "" {
return nil
}
svcPortMap := make(ServicePortMap)
svcName := types.NamespacedName{Namespace: service.Namespace, Name: service.Name}
for i := range service.Spec.Ports {
servicePort := &service.Spec.Ports[i]
svcPortName := ServicePortName{NamespacedName: svcName, Port: servicePort.Name, Protocol: servicePort.Protocol}
baseSvcInfo := newBaseServiceInfo(service, sct.ipFamily, servicePort)
if sct.makeServiceInfo != nil {
svcPortMap[svcPortName] = sct.makeServiceInfo(servicePort, service, baseSvcInfo)
} else {
svcPortMap[svcPortName] = baseSvcInfo
}
}
return svcPortMap
}
// Update updates ServicePortMap base on the given changes, returns information about the
// diff since the last Update, triggers processServiceMapChange on every change, and
// clears the changes map.
func (sm ServicePortMap) Update(sct *ServiceChangeTracker) UpdateServiceMapResult {
sct.lock.Lock()
defer sct.lock.Unlock()
result := UpdateServiceMapResult{
UpdatedServices: sets.New[types.NamespacedName](),
DeletedUDPClusterIPs: sets.New[string](),
}
for nn, change := range sct.items {
if sct.processServiceMapChange != nil {
sct.processServiceMapChange(change.previous, change.current)
}
result.UpdatedServices.Insert(nn)
sm.merge(change.current)
// filter out the Update event of current changes from previous changes
// before calling unmerge() so that can skip deleting the Update events.
change.previous.filter(change.current)
sm.unmerge(change.previous, result.DeletedUDPClusterIPs)
}
// clear changes after applying them to ServicePortMap.
sct.items = make(map[types.NamespacedName]*serviceChange)
metrics.ServiceChangesPending.Set(0)
return result
}
// merge adds other ServicePortMap's elements to current ServicePortMap.
// If collision, other ALWAYS win. Otherwise add the other to current.
// In other words, if some elements in current collisions with other, update the current by other.
func (sm *ServicePortMap) merge(other ServicePortMap) {
for svcPortName, info := range other {
_, exists := (*sm)[svcPortName]
if !exists {
klog.V(4).InfoS("Adding new service port", "portName", svcPortName, "servicePort", info)
} else {
klog.V(4).InfoS("Updating existing service port", "portName", svcPortName, "servicePort", info)
}
(*sm)[svcPortName] = info
}
}
// filter filters out elements from ServicePortMap base on given ports string sets.
func (sm *ServicePortMap) filter(other ServicePortMap) {
for svcPortName := range *sm {
// skip the delete for Update event.
if _, ok := other[svcPortName]; ok {
delete(*sm, svcPortName)
}
}
}
// unmerge deletes all other ServicePortMap's elements from current ServicePortMap and
// updates deletedUDPClusterIPs with all of the newly-deleted UDP cluster IPs.
func (sm *ServicePortMap) unmerge(other ServicePortMap, deletedUDPClusterIPs sets.Set[string]) {
for svcPortName := range other {
info, exists := (*sm)[svcPortName]
if exists {
klog.V(4).InfoS("Removing service port", "portName", svcPortName)
if info.Protocol() == v1.ProtocolUDP {
deletedUDPClusterIPs.Insert(info.ClusterIP().String())
}
delete(*sm, svcPortName)
} else {
klog.ErrorS(nil, "Service port does not exists", "portName", svcPortName)
}
}
}

0
pkg/proxy/service_test.go → pkg/proxy/servicechangetracker_test.go
View File

269
pkg/proxy/service.go → pkg/proxy/serviceport.go
View File

@ -19,22 +19,56 @@ package proxy
import (
"fmt"
"net"
"reflect"
"strings"
"sync"
"k8s.io/client-go/tools/events"
"k8s.io/klog/v2"
netutils "k8s.io/utils/net"
v1 "k8s.io/api/core/v1"
"k8s.io/apimachinery/pkg/types"
"k8s.io/apimachinery/pkg/util/sets"
"k8s.io/klog/v2"
apiservice "k8s.io/kubernetes/pkg/api/v1/service"
"k8s.io/kubernetes/pkg/proxy/metrics"
proxyutil "k8s.io/kubernetes/pkg/proxy/util"
netutils "k8s.io/utils/net"
)
// ServicePort is an interface which abstracts information about a service.
type ServicePort interface {
// String returns service string. An example format can be: `IP:Port/Protocol`.
String() string
// ClusterIP returns service cluster IP in net.IP format.
ClusterIP() net.IP
// Port returns service port if present. If return 0 means not present.
Port() int
// SessionAffinityType returns service session affinity type
SessionAffinityType() v1.ServiceAffinity
// StickyMaxAgeSeconds returns service max connection age
StickyMaxAgeSeconds() int
// ExternalIPStrings returns service ExternalIPs as a string array.
ExternalIPStrings() []string
// LoadBalancerVIPStrings returns service LoadBalancerIPs which are VIP mode as a string array.
LoadBalancerVIPStrings() []string
// Protocol returns service protocol.
Protocol() v1.Protocol
// LoadBalancerSourceRanges returns service LoadBalancerSourceRanges if present empty array if not
LoadBalancerSourceRanges() []string
// HealthCheckNodePort returns service health check node port if present. If return 0, it means not present.
HealthCheckNodePort() int
// NodePort returns a service Node port if present. If return 0, it means not present.
NodePort() int
// ExternalPolicyLocal returns if a service has only node local endpoints for external traffic.
ExternalPolicyLocal() bool
// InternalPolicyLocal returns if a service has only node local endpoints for internal traffic.
InternalPolicyLocal() bool
// HintsAnnotation returns the value of the v1.DeprecatedAnnotationTopologyAwareHints annotation.
HintsAnnotation() string
// ExternallyAccessible returns true if the service port is reachable via something
// other than ClusterIP (NodePort/ExternalIP/LoadBalancer)
ExternallyAccessible() bool
// UsesClusterEndpoints returns true if the service port ever sends traffic to
// endpoints based on "Cluster" traffic policy
UsesClusterEndpoints() bool
// UsesLocalEndpoints returns true if the service port ever sends traffic to
// endpoints based on "Local" traffic policy
UsesLocalEndpoints() bool
}
// BaseServicePortInfo contains base information that defines a service.
// This could be used directly by proxier while processing services,
// or can be used for constructing a more specific ServiceInfo struct
@ -240,220 +274,3 @@ func newBaseServiceInfo(service *v1.Service, ipFamily v1.IPFamily, port *v1.Serv
return info
}
type makeServicePortFunc func(*v1.ServicePort, *v1.Service, *BaseServicePortInfo) ServicePort
// This handler is invoked by the apply function on every change. This function should not modify the
// ServicePortMap's but just use the changes for any Proxier specific cleanup.
type processServiceMapChangeFunc func(previous, current ServicePortMap)
// serviceChange contains all changes to services that happened since proxy rules were synced. For a single object,
// changes are accumulated, i.e. previous is state from before applying the changes,
// current is state after applying all of the changes.
type serviceChange struct {
previous ServicePortMap
current ServicePortMap
}
// ServiceChangeTracker carries state about uncommitted changes to an arbitrary number of
// Services, keyed by their namespace and name.
type ServiceChangeTracker struct {
// lock protects items.
lock sync.Mutex
// items maps a service to its serviceChange.
items map[types.NamespacedName]*serviceChange
// makeServiceInfo allows proxier to inject customized information when processing service.
makeServiceInfo makeServicePortFunc
processServiceMapChange processServiceMapChangeFunc
ipFamily v1.IPFamily
recorder events.EventRecorder
}
// NewServiceChangeTracker initializes a ServiceChangeTracker
func NewServiceChangeTracker(makeServiceInfo makeServicePortFunc, ipFamily v1.IPFamily, recorder events.EventRecorder, processServiceMapChange processServiceMapChangeFunc) *ServiceChangeTracker {
return &ServiceChangeTracker{
items: make(map[types.NamespacedName]*serviceChange),
makeServiceInfo: makeServiceInfo,
recorder: recorder,
ipFamily: ipFamily,
processServiceMapChange: processServiceMapChange,
}
}
// Update updates given service's change map based on the <previous, current> service pair. It returns true if items changed,
// otherwise return false. Update can be used to add/update/delete items of ServiceChangeMap. For example,
// Add item
// - pass <nil, service> as the <previous, current> pair.
//
// Update item
// - pass <oldService, service> as the <previous, current> pair.
//
// Delete item
// - pass <service, nil> as the <previous, current> pair.
func (sct *ServiceChangeTracker) Update(previous, current *v1.Service) bool {
// This is unexpected, we should return false directly.
if previous == nil && current == nil {
return false
}
svc := current
if svc == nil {
svc = previous
}
metrics.ServiceChangesTotal.Inc()
namespacedName := types.NamespacedName{Namespace: svc.Namespace, Name: svc.Name}
sct.lock.Lock()
defer sct.lock.Unlock()
change, exists := sct.items[namespacedName]
if !exists {
change = &serviceChange{}
change.previous = sct.serviceToServiceMap(previous)
sct.items[namespacedName] = change
}
change.current = sct.serviceToServiceMap(current)
// if change.previous equal to change.current, it means no change
if reflect.DeepEqual(change.previous, change.current) {
delete(sct.items, namespacedName)
} else {
klog.V(4).InfoS("Service updated ports", "service", klog.KObj(svc), "portCount", len(change.current))
}
metrics.ServiceChangesPending.Set(float64(len(sct.items)))
return len(sct.items) > 0
}
// UpdateServiceMapResult is the updated results after applying service changes.
type UpdateServiceMapResult struct {
// UpdatedServices lists the names of all services added/updated/deleted since the
// last Update.
UpdatedServices sets.Set[types.NamespacedName]
// DeletedUDPClusterIPs holds stale (no longer assigned to a Service) Service IPs
// that had UDP ports. Callers can use this to abort timeout-waits or clear
// connection-tracking information.
DeletedUDPClusterIPs sets.Set[string]
}
// HealthCheckNodePorts returns a map of Service names to HealthCheckNodePort values
// for all Services in sm with non-zero HealthCheckNodePort.
func (sm ServicePortMap) HealthCheckNodePorts() map[types.NamespacedName]uint16 {
// TODO: If this will appear to be computationally expensive, consider
// computing this incrementally similarly to svcPortMap.
ports := make(map[types.NamespacedName]uint16)
for svcPortName, info := range sm {
if info.HealthCheckNodePort() != 0 {
ports[svcPortName.NamespacedName] = uint16(info.HealthCheckNodePort())
}
}
return ports
}
// ServicePortMap maps a service to its ServicePort.
type ServicePortMap map[ServicePortName]ServicePort
// serviceToServiceMap translates a single Service object to a ServicePortMap.
//
// NOTE: service object should NOT be modified.
func (sct *ServiceChangeTracker) serviceToServiceMap(service *v1.Service) ServicePortMap {
if service == nil {
return nil
}
if proxyutil.ShouldSkipService(service) {
return nil
}
clusterIP := proxyutil.GetClusterIPByFamily(sct.ipFamily, service)
if clusterIP == "" {
return nil
}
svcPortMap := make(ServicePortMap)
svcName := types.NamespacedName{Namespace: service.Namespace, Name: service.Name}
for i := range service.Spec.Ports {
servicePort := &service.Spec.Ports[i]
svcPortName := ServicePortName{NamespacedName: svcName, Port: servicePort.Name, Protocol: servicePort.Protocol}
baseSvcInfo := newBaseServiceInfo(service, sct.ipFamily, servicePort)
if sct.makeServiceInfo != nil {
svcPortMap[svcPortName] = sct.makeServiceInfo(servicePort, service, baseSvcInfo)
} else {
svcPortMap[svcPortName] = baseSvcInfo
}
}
return svcPortMap
}
// Update updates ServicePortMap base on the given changes, returns information about the
// diff since the last Update, triggers processServiceMapChange on every change, and
// clears the changes map.
func (sm ServicePortMap) Update(sct *ServiceChangeTracker) UpdateServiceMapResult {
sct.lock.Lock()
defer sct.lock.Unlock()
result := UpdateServiceMapResult{
UpdatedServices: sets.New[types.NamespacedName](),
DeletedUDPClusterIPs: sets.New[string](),
}
for nn, change := range sct.items {
if sct.processServiceMapChange != nil {
sct.processServiceMapChange(change.previous, change.current)
}
result.UpdatedServices.Insert(nn)
sm.merge(change.current)
// filter out the Update event of current changes from previous changes
// before calling unmerge() so that can skip deleting the Update events.
change.previous.filter(change.current)
sm.unmerge(change.previous, result.DeletedUDPClusterIPs)
}
// clear changes after applying them to ServicePortMap.
sct.items = make(map[types.NamespacedName]*serviceChange)
metrics.ServiceChangesPending.Set(0)
return result
}
// merge adds other ServicePortMap's elements to current ServicePortMap.
// If collision, other ALWAYS win. Otherwise add the other to current.
// In other words, if some elements in current collisions with other, update the current by other.
func (sm *ServicePortMap) merge(other ServicePortMap) {
for svcPortName, info := range other {
_, exists := (*sm)[svcPortName]
if !exists {
klog.V(4).InfoS("Adding new service port", "portName", svcPortName, "servicePort", info)
} else {
klog.V(4).InfoS("Updating existing service port", "portName", svcPortName, "servicePort", info)
}
(*sm)[svcPortName] = info
}
}
// filter filters out elements from ServicePortMap base on given ports string sets.
func (sm *ServicePortMap) filter(other ServicePortMap) {
for svcPortName := range *sm {
// skip the delete for Update event.
if _, ok := other[svcPortName]; ok {
delete(*sm, svcPortName)
}
}
}
// unmerge deletes all other ServicePortMap's elements from current ServicePortMap and
// updates deletedUDPClusterIPs with all of the newly-deleted UDP cluster IPs.
func (sm *ServicePortMap) unmerge(other ServicePortMap, deletedUDPClusterIPs sets.Set[string]) {
for svcPortName := range other {
info, exists := (*sm)[svcPortName]
if exists {
klog.V(4).InfoS("Removing service port", "portName", svcPortName)
if info.Protocol() == v1.ProtocolUDP {
deletedUDPClusterIPs.Insert(info.ClusterIP().String())
}
delete(*sm, svcPortName)
} else {
klog.ErrorS(nil, "Service port does not exists", "portName", svcPortName)
}
}
}

71
pkg/proxy/types.go
View File

@ -18,11 +18,9 @@ package proxy
import (
"fmt"
"net"
v1 "k8s.io/api/core/v1"
"k8s.io/apimachinery/pkg/types"
"k8s.io/apimachinery/pkg/util/sets"
"k8s.io/kubernetes/pkg/proxy/config"
)
@ -59,75 +57,6 @@ func fmtPortName(in string) string {
return fmt.Sprintf(":%s", in)
}
// ServicePort is an interface which abstracts information about a service.
type ServicePort interface {
// String returns service string. An example format can be: `IP:Port/Protocol`.
String() string
// ClusterIP returns service cluster IP in net.IP format.
ClusterIP() net.IP
// Port returns service port if present. If return 0 means not present.
Port() int
// SessionAffinityType returns service session affinity type
SessionAffinityType() v1.ServiceAffinity
// StickyMaxAgeSeconds returns service max connection age
StickyMaxAgeSeconds() int
// ExternalIPStrings returns service ExternalIPs as a string array.
ExternalIPStrings() []string
// LoadBalancerVIPStrings returns service LoadBalancerIPs which are VIP mode as a string array.
LoadBalancerVIPStrings() []string
// Protocol returns service protocol.
Protocol() v1.Protocol
// LoadBalancerSourceRanges returns service LoadBalancerSourceRanges if present empty array if not
LoadBalancerSourceRanges() []string
// HealthCheckNodePort returns service health check node port if present. If return 0, it means not present.
HealthCheckNodePort() int
// NodePort returns a service Node port if present. If return 0, it means not present.
NodePort() int
// ExternalPolicyLocal returns if a service has only node local endpoints for external traffic.
ExternalPolicyLocal() bool
// InternalPolicyLocal returns if a service has only node local endpoints for internal traffic.
InternalPolicyLocal() bool
// HintsAnnotation returns the value of the v1.DeprecatedAnnotationTopologyAwareHints annotation.
HintsAnnotation() string
// ExternallyAccessible returns true if the service port is reachable via something
// other than ClusterIP (NodePort/ExternalIP/LoadBalancer)
ExternallyAccessible() bool
// UsesClusterEndpoints returns true if the service port ever sends traffic to
// endpoints based on "Cluster" traffic policy
UsesClusterEndpoints() bool
// UsesLocalEndpoints returns true if the service port ever sends traffic to
// endpoints based on "Local" traffic policy
UsesLocalEndpoints() bool
}
// Endpoint in an interface which abstracts information about an endpoint.
// TODO: Rename functions to be consistent with ServicePort.
type Endpoint interface {
// String returns endpoint string. An example format can be: `IP:Port`.
// We take the returned value as ServiceEndpoint.Endpoint.
String() string
// IP returns IP part of the endpoint.
IP() string
// Port returns the Port part of the endpoint.
Port() int
// IsLocal returns true if the endpoint is running on the same host as kube-proxy.
IsLocal() bool
// IsReady returns true if an endpoint is ready and not terminating, or
// if PublishNotReadyAddresses is set on the service.
IsReady() bool
// IsServing returns true if an endpoint is ready. It does not account
// for terminating state.
IsServing() bool
// IsTerminating returns true if an endpoint is terminating. For pods,
// that is any pod with a deletion timestamp.
IsTerminating() bool
// ZoneHints returns the zone hint for the endpoint. This is based on
// endpoint.hints.forZones[0].name in the EndpointSlice API.
ZoneHints() sets.Set[string]
}
// ServiceEndpoint is used to identify a service and one of its endpoint pair.
type ServiceEndpoint struct {
Endpoint string