/
groupcounter.go
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/
groupcounter.go
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// Copyright 2020 Antrea 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 types
import (
"fmt"
"sync"
"k8s.io/apimachinery/pkg/util/sets"
"antrea.io/antrea/pkg/agent/openflow"
binding "antrea.io/antrea/pkg/ovs/openflow"
k8sproxy "antrea.io/antrea/third_party/proxy"
)
// GroupCounter generates and manages global unique group ID.
type GroupCounter interface {
// AllocateIfNotExist generates a global unique group ID for a Service if the group ID has not been generated, then
// return the group ID (newly allocated or already allocated).
AllocateIfNotExist(svcPortName k8sproxy.ServicePortName, isEndpointsLocal bool) binding.GroupIDType
// Get gets the group ID for the Service.
Get(svcPortName k8sproxy.ServicePortName, isEndpointsLocal bool) (binding.GroupIDType, bool)
// Recycle removes the Service group ID mapping. The recycled group ID can be reused.
Recycle(svcPortName k8sproxy.ServicePortName, isEndpointsLocal bool) bool
// GetAllGroupIDs gets all group IDs related to the Service.
GetAllGroupIDs(svcNamespacedName string) []binding.GroupIDType
}
type groupCounter struct {
mu sync.Mutex
groupAllocator openflow.GroupAllocator
groupIDUpdates chan<- string
servicePortNamesMap map[string]sets.String
groupMap map[string]binding.GroupIDType
}
func NewGroupCounter(groupAllocator openflow.GroupAllocator, groupIDUpdates chan<- string) *groupCounter {
return &groupCounter{groupMap: map[string]binding.GroupIDType{}, groupAllocator: groupAllocator, groupIDUpdates: groupIDUpdates, servicePortNamesMap: map[string]sets.String{}}
}
func keyString(svcPortName k8sproxy.ServicePortName, isEndpointsLocal bool) string {
key := svcPortName.String()
if isEndpointsLocal {
key = fmt.Sprintf("%s/local", key)
}
return key
}
func (c *groupCounter) updateServicePortNameMap(svcNamespacedName string, svcKeyString string) {
if _, ok := c.servicePortNamesMap[svcNamespacedName]; ok {
c.servicePortNamesMap[svcNamespacedName].Insert(svcKeyString)
} else {
keyStringSet := sets.NewString(svcKeyString)
c.servicePortNamesMap[svcNamespacedName] = keyStringSet
}
}
func (c *groupCounter) deleteServicePortNameMap(svcNamespacedName string, svcKeyString string) {
keyStringSet, ok := c.servicePortNamesMap[svcNamespacedName]
if !ok {
return
}
keyStringSet.Delete(svcKeyString)
if keyStringSet.Len() == 0 {
delete(c.servicePortNamesMap, svcNamespacedName)
}
}
func (c *groupCounter) AllocateIfNotExist(svcPortName k8sproxy.ServicePortName, isEndpointsLocal bool) binding.GroupIDType {
c.mu.Lock()
defer c.mu.Unlock()
key := keyString(svcPortName, isEndpointsLocal)
if id, ok := c.groupMap[key]; ok {
return id
}
id := c.groupAllocator.Allocate()
c.groupMap[key] = id
c.updateServicePortNameMap(svcPortName.NamespacedName.String(), key)
c.groupIDUpdates <- svcPortName.NamespacedName.String()
return id
}
func (c *groupCounter) Get(svcPortName k8sproxy.ServicePortName, isEndpointsLocal bool) (binding.GroupIDType, bool) {
c.mu.Lock()
defer c.mu.Unlock()
key := keyString(svcPortName, isEndpointsLocal)
id, exist := c.groupMap[key]
return id, exist
}
func (c *groupCounter) Recycle(svcPortName k8sproxy.ServicePortName, isEndpointsLocal bool) bool {
c.mu.Lock()
defer c.mu.Unlock()
key := keyString(svcPortName, isEndpointsLocal)
if id, ok := c.groupMap[key]; ok {
delete(c.groupMap, key)
c.groupAllocator.Release(id)
c.deleteServicePortNameMap(svcPortName.NamespacedName.String(), key)
c.groupIDUpdates <- svcPortName.NamespacedName.String()
return true
}
return false
}
func (c *groupCounter) GetAllGroupIDs(svcNamespacedName string) []binding.GroupIDType {
c.mu.Lock()
defer c.mu.Unlock()
var ids []binding.GroupIDType
for _, key := range c.servicePortNamesMap[svcNamespacedName].UnsortedList() {
if id, ok := c.groupMap[key]; ok {
ids = append(ids, id)
}
}
return ids
}