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turnallocated.go
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turnallocated.go
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package goturn
import (
"bytes"
"container/list"
"errors"
"fmt"
"net"
"sync"
"time"
)
type TurnAddress struct {
local net.Addr
remote net.Addr
relay []net.Addr
protocol int //0: udp 1:tcp 2:tls
}
type TurnPermissions struct {
expired time.Time
ip string
}
const MAX_TURN_CAHNNEL_NUM = 8
type TurnChannel struct {
ip string
port string
channel uint16
expired time.Time
}
type TurnAllocation struct {
addr TurnAddress
expire time.Time
lifeTime uint32
reserveNextHigerPort int
token []byte
dontfragment int
auth CredentialsInfo
permissions *list.List
channels *list.List
mtx sync.Mutex
}
func (a *TurnAllocation) findTurnChannel(channel uint16) (*TurnChannel, bool) {
a.mtx.Lock()
defer a.mtx.Unlock()
for e := a.channels.Front(); e != nil; e = e.Next() {
if ch, ok := e.Value.(*TurnChannel); ok {
if ch.channel == channel {
return ch, true
}
}
}
return nil, false
}
func (a *TurnAllocation) findTurnChannelByAddr(addr net.Addr) (*TurnChannel, bool) {
a.mtx.Lock()
defer a.mtx.Unlock()
host, port, _ := net.SplitHostPort(addr.String())
for e := a.channels.Front(); e != nil; e = e.Next() {
if ch, ok := e.Value.(*TurnChannel); ok {
if ch.ip == host && ch.port == port {
return ch, true
}
}
}
return nil, false
}
func (a *TurnAllocation) addTurnChannel(channel *TurnChannel) {
a.mtx.Lock()
defer a.mtx.Unlock()
a.channels.PushBack(channel)
}
func (a *TurnAllocation) addTurnPermission(premission *TurnPermissions) {
a.mtx.Lock()
defer a.mtx.Unlock()
a.permissions.PushBack(premission)
}
func (a *TurnAllocation) findTurnPermissionByAddr(addr net.Addr) (*TurnPermissions, bool) {
a.mtx.Lock()
defer a.mtx.Unlock()
host, _, _ := net.SplitHostPort(addr.String())
for e := a.permissions.Front(); e != nil; e = e.Next() {
if per, ok := e.Value.(*TurnPermissions); ok {
if per.ip == host {
return per, true
}
}
}
return nil, false
}
func (a *TurnAllocation) findTurnPermissionByHost(host string) (*TurnPermissions, bool) {
a.mtx.Lock()
defer a.mtx.Unlock()
for e := a.permissions.Front(); e != nil; e = e.Next() {
if per, ok := e.Value.(*TurnPermissions); ok {
if per.ip == host {
return per, true
}
}
}
return nil, false
}
type AllocationManager struct {
mtx sync.Mutex
allocatedList *list.List
reservedList *list.List
}
var manager AllocationManager
func init() {
manager.allocatedList = list.New()
manager.reservedList = list.New()
go manager.checkLiveness()
}
func (m *AllocationManager) addAllocation(a *TurnAllocation) {
m.mtx.Lock()
defer m.mtx.Unlock()
m.allocatedList.PushBack(a)
}
func (m *AllocationManager) findAllocatiionByTurnAddress(local net.Addr, remote net.Addr, protocol int) (*TurnAllocation, error) {
m.mtx.Lock()
defer m.mtx.Unlock()
for e := m.allocatedList.Front(); e != nil; e = e.Next() {
a, ok := e.Value.(*TurnAllocation)
if ok {
if a.addr.local.String() == local.String() && a.addr.remote.String() == remote.String() && a.addr.protocol == protocol {
return a, nil
}
}
}
return nil, errors.New("Not Found")
}
func (m *AllocationManager) removeAllocation(allocation *TurnAllocation) {
m.mtx.Lock()
defer m.mtx.Unlock()
for e := m.allocatedList.Front(); e != nil; e = e.Next() {
a, ok := e.Value.(*TurnAllocation)
if ok {
if a == allocation {
removeRelay(a.addr.relay[0].String())
m.allocatedList.Remove(e)
return
}
}
}
}
func (m *AllocationManager) findReservedAllocationByToken(token []byte) (*TurnAllocation, error) {
m.mtx.Lock()
defer m.mtx.Unlock()
for e := m.reservedList.Front(); e != nil; e = e.Next() {
a, ok := e.Value.(*TurnAllocation)
if ok {
if bytes.Compare(a.token, token) == 0 {
return a, nil
}
}
}
return nil, errors.New("Not Found")
}
func (m *AllocationManager) removeReservedAllocationByToken(token []byte) {
m.mtx.Lock()
defer m.mtx.Unlock()
for e := m.reservedList.Front(); e != nil; e = e.Next() {
a, ok := e.Value.(TurnAllocation)
if ok {
if bytes.Compare(a.token, token) == 0 {
m.reservedList.Remove(e)
return
}
}
}
}
func (m *AllocationManager) checkLiveness() {
for {
m.mtx.Lock()
fmt.Println("CheckLiveness")
var next *list.Element
for e := m.allocatedList.Front(); e != nil; e = next {
a, ok := e.Value.(*TurnAllocation)
if ok {
if time.Now().After(a.expire) {
next = e.Next()
m.allocatedList.Remove(e)
fmt.Println("Allocation is idle remote it" + a.addr.remote.String())
continue
}
}
next = e.Next()
}
for e := m.reservedList.Front(); e != nil; e = next {
a, ok := e.Value.(TurnAllocation)
if ok {
if time.Now().After(a.expire) {
next = e.Next()
m.reservedList.Remove(e)
continue
}
}
next = e.Next()
}
m.mtx.Unlock()
time.Sleep(time.Second * time.Duration(TURN_LIFTTIME))
}
}