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sets.go
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sets.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 v1beta2
import (
"net"
"strings"
"k8s.io/apimachinery/pkg/util/sets"
)
// groupMemberKey is used to uniquely identify GroupMember.
type groupMemberKey string
// GroupMemberSet is a set of GroupMembers.
// +k8s:openapi-gen=false
// +k8s:deepcopy-gen=false
type GroupMemberSet map[groupMemberKey]*GroupMember
// normalizeGroupMember calculates the groupMemberKey of the provided
// GroupMember based on the Pod/ExternalEntity's namespaced name and IPs.
// For GroupMembers in appliedToGroups, the IPs are not set, so the
// generated key does not contain IP information.
func normalizeGroupMember(member *GroupMember) groupMemberKey {
// "/" is illegal in Namespace and name so is safe as the delimiter.
const delimiter = "/"
var b strings.Builder
if member.Pod != nil {
b.WriteString(member.Pod.Namespace)
b.WriteString(delimiter)
b.WriteString(member.Pod.Name)
} else if member.ExternalEntity != nil {
b.WriteString(member.ExternalEntity.Namespace)
b.WriteString(delimiter)
b.WriteString(member.ExternalEntity.Name)
}
for _, ip := range member.IPs {
b.Write(ip)
}
return groupMemberKey(b.String())
}
// NewGroupMemberSet builds a GroupMemberSet from a list of GroupMember.
func NewGroupMemberSet(items ...*GroupMember) GroupMemberSet {
m := GroupMemberSet{}
m.Insert(items...)
return m
}
// Insert adds items to the set.
func (s GroupMemberSet) Insert(items ...*GroupMember) {
for _, item := range items {
s[normalizeGroupMember(item)] = item
}
}
// Delete removes all items from the set.
func (s GroupMemberSet) Delete(items ...*GroupMember) {
for _, item := range items {
delete(s, normalizeGroupMember(item))
}
}
// Has returns true if and only if item is contained in the set.
func (s GroupMemberSet) Has(item *GroupMember) bool {
_, contained := s[normalizeGroupMember(item)]
return contained
}
// Difference returns a set of GroupMembers that are not in o.
func (s GroupMemberSet) Difference(o GroupMemberSet) GroupMemberSet {
result := GroupMemberSet{}
for key, item := range s {
if _, contained := o[key]; !contained {
result[key] = item
}
}
return result
}
// IPDifference returns a String set of GroupMember IPs that are not in o.
func (s GroupMemberSet) IPDifference(o GroupMemberSet) sets.String {
sIPs, oIPs := sets.NewString(), sets.NewString()
for _, m := range s {
for _, ip := range m.IPs {
sIPs.Insert(net.IP(ip).String())
}
}
for _, m := range o {
for _, ip := range m.IPs {
oIPs.Insert(net.IP(ip).String())
}
}
return sIPs.Difference(oIPs)
}
// Union returns a new set which includes items in either m or o.
func (s GroupMemberSet) Union(o GroupMemberSet) GroupMemberSet {
result := GroupMemberSet{}
for key, item := range s {
result[key] = item
}
for key, item := range o {
result[key] = item
}
return result
}
// Merge merges the other set into the set.
// For example:
// s1 = {a1, a2, a3}
// s2 = {a1, a2, a4, a5}
// s1.Merge(s2) = {a1, a2, a3, a4, a5}
// s1 = {a1, a2, a3, a4, a5}
//
// It should be used instead of s1.Union(s2) when constructing a new set is not required.
func (s GroupMemberSet) Merge(o GroupMemberSet) GroupMemberSet {
for key, item := range o {
s[key] = item
}
return s
}
// IsSuperset returns true if and only if s1 is a superset of s2.
func (s GroupMemberSet) IsSuperset(o GroupMemberSet) bool {
for key := range o {
_, contained := s[key]
if !contained {
return false
}
}
return true
}
// Equal returns true if and only if s1 is equal (as a set) to s2.
// Two sets are equal if their membership is identical.
// (In practice, this means same elements, order doesn't matter)
func (s GroupMemberSet) Equal(o GroupMemberSet) bool {
return len(s) == len(o) && s.IsSuperset(o)
}
// Items returns the slice with contents in random order.
func (s GroupMemberSet) Items() []*GroupMember {
res := make([]*GroupMember, 0, len(s))
for _, item := range s {
res = append(res, item)
}
return res
}