/
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 (
"sync"
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 {
// Get generates a global unique group ID for a specific service.
// If the group ID of the service has been generated, then return the
// prior one. The bool return value indicates whether the groupID is newly
// generated.
Get(svcPortName k8sproxy.ServicePortName) (binding.GroupIDType, bool)
// Recycle removes a Service Group ID mapping. The recycled groupID can be
// reused.
Recycle(svcPortName k8sproxy.ServicePortName) bool
}
type groupCounter struct {
mu sync.Mutex
groupIDCounter binding.GroupIDType
recycled []binding.GroupIDType
groupMap map[k8sproxy.ServicePortName]binding.GroupIDType
}
func NewGroupCounter(isIPv6 bool) *groupCounter {
var groupIDCounter binding.GroupIDType
if isIPv6 {
groupIDCounter = 0x10000000
}
return &groupCounter{groupMap: map[k8sproxy.ServicePortName]binding.GroupIDType{}, groupIDCounter: groupIDCounter}
}
func (c *groupCounter) Get(svcPortName k8sproxy.ServicePortName) (binding.GroupIDType, bool) {
c.mu.Lock()
defer c.mu.Unlock()
if id, ok := c.groupMap[svcPortName]; ok {
return id, false
} else if len(c.recycled) != 0 {
id = c.recycled[len(c.recycled)-1]
c.recycled = c.recycled[:len(c.recycled)-1]
c.groupMap[svcPortName] = id
return id, true
} else {
c.groupIDCounter += 1
c.groupMap[svcPortName] = c.groupIDCounter
return c.groupIDCounter, true
}
}
func (c *groupCounter) Recycle(svcPortName k8sproxy.ServicePortName) bool {
c.mu.Lock()
defer c.mu.Unlock()
if id, ok := c.groupMap[svcPortName]; ok {
delete(c.groupMap, svcPortName)
c.recycled = append(c.recycled, id)
return true
}
return false
}