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svc.go
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svc.go
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// Copyright 2020 Anapaya Systems
//
// 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 router
import (
mrand "math/rand"
"net"
"sync"
"github.com/scionproto/scion/pkg/addr"
)
type services struct {
mtx sync.Mutex
m map[addr.SVC][]*net.UDPAddr
}
func newServices() *services {
return &services{m: make(map[addr.SVC][]*net.UDPAddr)}
}
func (s *services) AddSvc(svc addr.SVC, a *net.UDPAddr) {
s.mtx.Lock()
defer s.mtx.Unlock()
addrs := s.m[svc]
if _, ok := s.index(a, addrs); ok {
return
}
s.m[svc] = append(addrs, a)
}
func (s *services) DelSvc(svc addr.SVC, a *net.UDPAddr) {
s.mtx.Lock()
defer s.mtx.Unlock()
addrs := s.m[svc]
index, ok := s.index(a, addrs)
if !ok {
return
}
addrs[index] = addrs[len(addrs)-1]
addrs[len(addrs)-1] = nil
s.m[svc] = addrs[:len(addrs)-1]
}
func (s *services) Any(svc addr.SVC) (*net.UDPAddr, bool) {
s.mtx.Lock()
defer s.mtx.Unlock()
addrs := s.m[svc]
if len(addrs) == 0 {
return nil, false
}
return addrs[mrand.Intn(len(addrs))], true
}
func (s *services) index(a *net.UDPAddr, addrs []*net.UDPAddr) (int, bool) {
for i, o := range addrs {
if a.IP.Equal(o.IP) && a.Port == o.Port {
return i, true
}
}
return -1, false
}