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pool_client.go
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pool_client.go
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package tuic
import (
"context"
"errors"
"net"
"runtime"
"sync"
"time"
"github.com/MerlinKodo/clash-rev/common/generics/list"
N "github.com/MerlinKodo/clash-rev/common/net"
C "github.com/MerlinKodo/clash-rev/constant"
"github.com/MerlinKodo/clash-rev/log"
"github.com/MerlinKodo/quic-go"
)
type dialResult struct {
transport *quic.Transport
addr net.Addr
err error
}
type PoolClient struct {
newClientOptionV4 *ClientOptionV4
newClientOptionV5 *ClientOptionV5
dialResultMap map[C.Dialer]dialResult
dialResultMutex *sync.Mutex
tcpClients *list.List[Client]
tcpClientsMutex *sync.Mutex
udpClients *list.List[Client]
udpClientsMutex *sync.Mutex
}
func (t *PoolClient) DialContextWithDialer(ctx context.Context, metadata *C.Metadata, dialer C.Dialer, dialFn DialFunc) (net.Conn, error) {
newDialFn := func(ctx context.Context, dialer C.Dialer) (transport *quic.Transport, addr net.Addr, err error) {
return t.dial(ctx, dialer, dialFn)
}
conn, err := t.getClient(false, dialer).DialContextWithDialer(ctx, metadata, dialer, newDialFn)
if errors.Is(err, TooManyOpenStreams) {
conn, err = t.newClient(false, dialer).DialContextWithDialer(ctx, metadata, dialer, newDialFn)
}
if err != nil {
return nil, err
}
return N.NewRefConn(conn, t), err
}
func (t *PoolClient) ListenPacketWithDialer(ctx context.Context, metadata *C.Metadata, dialer C.Dialer, dialFn DialFunc) (net.PacketConn, error) {
newDialFn := func(ctx context.Context, dialer C.Dialer) (transport *quic.Transport, addr net.Addr, err error) {
return t.dial(ctx, dialer, dialFn)
}
pc, err := t.getClient(true, dialer).ListenPacketWithDialer(ctx, metadata, dialer, newDialFn)
if errors.Is(err, TooManyOpenStreams) {
pc, err = t.newClient(true, dialer).ListenPacketWithDialer(ctx, metadata, dialer, newDialFn)
}
if err != nil {
return nil, err
}
return N.NewRefPacketConn(pc, t), nil
}
func (t *PoolClient) dial(ctx context.Context, dialer C.Dialer, dialFn DialFunc) (transport *quic.Transport, addr net.Addr, err error) {
t.dialResultMutex.Lock()
dr, ok := t.dialResultMap[dialer]
t.dialResultMutex.Unlock()
if ok {
return dr.transport, dr.addr, dr.err
}
transport, addr, err = dialFn(ctx, dialer)
if err != nil {
return nil, nil, err
}
if _, ok := transport.Conn.(*net.UDPConn); ok { // only cache the system's UDPConn
transport.SetSingleUse(false) // don't close transport in each dial
dr.transport, dr.addr, dr.err = transport, addr, err
t.dialResultMutex.Lock()
t.dialResultMap[dialer] = dr
t.dialResultMutex.Unlock()
}
return transport, addr, err
}
func (t *PoolClient) forceClose() {
t.dialResultMutex.Lock()
defer t.dialResultMutex.Unlock()
for key := range t.dialResultMap {
transport := t.dialResultMap[key].transport
if transport != nil {
_ = transport.Close()
}
delete(t.dialResultMap, key)
}
}
func (t *PoolClient) newClient(udp bool, dialer C.Dialer) (client Client) {
clients := t.tcpClients
clientsMutex := t.tcpClientsMutex
if udp {
clients = t.udpClients
clientsMutex = t.udpClientsMutex
}
clientsMutex.Lock()
defer clientsMutex.Unlock()
if t.newClientOptionV4 != nil {
client = NewClientV4(t.newClientOptionV4, udp, dialer)
} else {
client = NewClientV5(t.newClientOptionV5, udp, dialer)
}
client.SetLastVisited(time.Now())
clients.PushFront(client)
return client
}
func (t *PoolClient) getClient(udp bool, dialer C.Dialer) Client {
clients := t.tcpClients
clientsMutex := t.tcpClientsMutex
if udp {
clients = t.udpClients
clientsMutex = t.udpClientsMutex
}
var bestClient Client
func() {
clientsMutex.Lock()
defer clientsMutex.Unlock()
for it := clients.Front(); it != nil; {
client := it.Value
if client == nil {
next := it.Next()
clients.Remove(it)
it = next
continue
}
if client.DialerRef() == dialer {
if bestClient == nil {
bestClient = client
} else {
if client.OpenStreams() < bestClient.OpenStreams() {
bestClient = client
}
}
}
it = it.Next()
}
}()
for it := clients.Front(); it != nil; {
client := it.Value
if client != bestClient && client.OpenStreams() == 0 && time.Now().Sub(client.LastVisited()) > 30*time.Minute {
client.Close()
next := it.Next()
clients.Remove(it)
it = next
continue
}
it = it.Next()
}
if bestClient == nil {
return t.newClient(udp, dialer)
} else {
bestClient.SetLastVisited(time.Now())
return bestClient
}
}
func NewPoolClientV4(clientOption *ClientOptionV4) *PoolClient {
p := &PoolClient{
dialResultMap: make(map[C.Dialer]dialResult),
dialResultMutex: &sync.Mutex{},
tcpClients: list.New[Client](),
tcpClientsMutex: &sync.Mutex{},
udpClients: list.New[Client](),
udpClientsMutex: &sync.Mutex{},
}
newClientOption := *clientOption
p.newClientOptionV4 = &newClientOption
runtime.SetFinalizer(p, closeClientPool)
log.Debugln("New TuicV4 PoolClient at %p", p)
return p
}
func NewPoolClientV5(clientOption *ClientOptionV5) *PoolClient {
p := &PoolClient{
dialResultMap: make(map[C.Dialer]dialResult),
dialResultMutex: &sync.Mutex{},
tcpClients: list.New[Client](),
tcpClientsMutex: &sync.Mutex{},
udpClients: list.New[Client](),
udpClientsMutex: &sync.Mutex{},
}
newClientOption := *clientOption
p.newClientOptionV5 = &newClientOption
runtime.SetFinalizer(p, closeClientPool)
log.Debugln("New TuicV5 PoolClient at %p", p)
return p
}
func closeClientPool(client *PoolClient) {
log.Debugln("Close Tuic PoolClient at %p", client)
client.forceClose()
}