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udp.go
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udp.go
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package entrypoint
import (
"crypto/md5"
"encoding/hex"
"fmt"
"sync"
"sync/atomic"
"time"
"github.com/go-gost/core/chain"
"github.com/go-gost/core/handler"
"github.com/go-gost/core/listener"
"github.com/go-gost/core/logger"
"github.com/go-gost/core/service"
"github.com/go-gost/gost-plus/tunnel"
"github.com/go-gost/x/config"
chain_parser "github.com/go-gost/x/config/parsing/chain"
"github.com/go-gost/x/handler/forward/local"
"github.com/go-gost/x/hop"
"github.com/go-gost/x/listener/udp"
mdx "github.com/go-gost/x/metadata"
xservice "github.com/go-gost/x/service"
"github.com/google/uuid"
)
type udpEntryPoint struct {
endpoint string
opts tunnel.Options
config *config.Config
forward service.Service
favorite atomic.Bool
cclose chan struct{}
err error
mu sync.RWMutex
}
func NewUDPEntryPoint(opts ...tunnel.Option) EntryPoint {
var options tunnel.Options
for _, opt := range opts {
opt(&options)
}
if options.ID == "" {
options.ID = uuid.NewString()
}
v := md5.Sum([]byte(options.ID))
endpoint := hex.EncodeToString(v[:8])
if options.Endpoint == "" {
options.Endpoint = "localhost:8000"
}
if options.Name == "" {
options.Name = endpoint
}
s := &udpEntryPoint{
endpoint: endpoint,
opts: options,
cclose: make(chan struct{}),
}
return s
}
func (s *udpEntryPoint) ID() string {
return s.opts.ID
}
func (s *udpEntryPoint) Type() string {
return UDPEntryPoint
}
func (s *udpEntryPoint) Name() string {
return s.opts.Name
}
func (s *udpEntryPoint) Endpoint() string {
return fmt.Sprintf("%s.%s", s.endpoint, tunnel.EndpointAddr)
}
func (s *udpEntryPoint) Entrypoint() string {
return s.opts.Endpoint
}
func (s *udpEntryPoint) Options() tunnel.Options {
return s.opts
}
func (s *udpEntryPoint) Favorite(b bool) {
s.favorite.Store(b)
}
func (s *udpEntryPoint) IsFavorite() bool {
return s.favorite.Load()
}
func (s *udpEntryPoint) init() error {
tcp := &config.ServiceConfig{
Name: s.opts.Name,
Addr: s.opts.Endpoint,
Handler: &config.HandlerConfig{
Type: "udp",
Chain: s.opts.Name,
},
Listener: &config.ListenerConfig{
Type: "udp",
Metadata: map[string]any{
"keepalive": s.opts.Keepalive,
"ttl": time.Duration(s.opts.TTL) * time.Second,
},
},
Forwarder: &config.ForwarderConfig{
Nodes: []*config.ForwardNodeConfig{
{
Name: s.opts.Name,
Addr: s.Endpoint(),
},
},
},
}
s.config = &config.Config{
Services: []*config.ServiceConfig{tcp},
Chains: []*config.ChainConfig{tunnel.ChainConfig(s.opts.ID, s.opts.Name)},
}
return nil
}
func (s *udpEntryPoint) Run() (err error) {
if s.IsClosed() {
return ErrEntryPointClosed
}
defer func() {
s.setErr(err)
}()
if err = s.init(); err != nil {
return
}
log := logger.Default().WithFields(map[string]any{
"kind": "service",
"service": s.opts.Name,
})
{
var ch chain.Chainer
ch, err = chain_parser.ParseChain(s.config.Chains[0], log)
if err != nil {
log.Error(err)
return
}
cfg := s.config.Services[0]
ln := udp.NewListener(
listener.AddrOption(cfg.Addr),
listener.LoggerOption(log.WithFields(map[string]any{"kind": "listener", "listener": "udp"})),
)
if err = ln.Init(mdx.NewMetadata(cfg.Listener.Metadata)); err != nil {
return
}
h := local.NewHandler(
handler.RouterOption(chain.NewRouter(
chain.ChainRouterOption(ch),
chain.LoggerRouterOption(log),
)),
handler.LoggerOption(log.WithFields(map[string]any{"kind": "handler", "handler": "udp"})),
)
if err = h.Init(mdx.NewMetadata(cfg.Handler.Metadata)); err != nil {
return
}
node := cfg.Forwarder.Nodes[0]
if forwarder, ok := h.(handler.Forwarder); ok {
forwarder.Forward(hop.NewHop(
hop.NodeOption(chain.NewNode(node.Name, node.Addr)),
hop.LoggerOption(log.WithFields(map[string]any{"kind": "hop"})),
))
}
s.forward = xservice.NewService(s.opts.Name, ln, h, xservice.LoggerOption(log))
}
go func() {
s.setErr(s.forward.Serve())
}()
return nil
}
func (s *udpEntryPoint) Close() error {
defer func() {
select {
case <-s.cclose:
default:
close(s.cclose)
}
}()
if s.forward != nil {
return s.forward.Close()
}
return nil
}
func (s *udpEntryPoint) IsClosed() bool {
select {
case <-s.cclose:
return true
default:
return false
}
}
func (s *udpEntryPoint) setErr(err error) {
s.mu.Lock()
defer s.mu.Unlock()
s.err = err
}
func (s *udpEntryPoint) Err() error {
s.mu.RLock()
defer s.mu.RUnlock()
return s.err
}