mirror of https://github.com/v2fly/v2ray-core.git
116 lines
2.6 KiB
Go
116 lines
2.6 KiB
Go
package udp
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import (
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"context"
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"sync"
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"time"
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"v2ray.com/core/common"
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"v2ray.com/core/common/buf"
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"v2ray.com/core/common/net"
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"v2ray.com/core/common/session"
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"v2ray.com/core/common/signal"
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"v2ray.com/core/features/routing"
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"v2ray.com/core/transport"
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)
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type ResponseCallback func(ctx context.Context, payload *buf.Buffer)
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type connEntry struct {
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link *transport.Link
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timer signal.ActivityUpdater
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cancel context.CancelFunc
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}
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type Dispatcher struct {
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sync.RWMutex
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conns map[net.Destination]*connEntry
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dispatcher routing.Dispatcher
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callback ResponseCallback
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}
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func NewDispatcher(dispatcher routing.Dispatcher, callback ResponseCallback) *Dispatcher {
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return &Dispatcher{
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conns: make(map[net.Destination]*connEntry),
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dispatcher: dispatcher,
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callback: callback,
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}
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}
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func (v *Dispatcher) RemoveRay(dest net.Destination) {
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v.Lock()
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defer v.Unlock()
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if conn, found := v.conns[dest]; found {
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common.Close(conn.link.Reader)
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common.Close(conn.link.Writer)
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delete(v.conns, dest)
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}
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}
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func (v *Dispatcher) getInboundRay(ctx context.Context, dest net.Destination) *connEntry {
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v.Lock()
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defer v.Unlock()
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if entry, found := v.conns[dest]; found {
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return entry
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}
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newError("establishing new connection for ", dest).WriteToLog()
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ctx, cancel := context.WithCancel(ctx)
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removeRay := func() {
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cancel()
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v.RemoveRay(dest)
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}
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timer := signal.CancelAfterInactivity(ctx, removeRay, time.Second*4)
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link, _ := v.dispatcher.Dispatch(ctx, dest)
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entry := &connEntry{
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link: link,
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timer: timer,
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cancel: removeRay,
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}
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v.conns[dest] = entry
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go handleInput(ctx, entry, v.callback)
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return entry
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}
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func (v *Dispatcher) Dispatch(ctx context.Context, destination net.Destination, payload *buf.Buffer) {
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// TODO: Add user to destString
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newError("dispatch request to: ", destination).AtDebug().WriteToLog(session.ExportIDToError(ctx))
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conn := v.getInboundRay(ctx, destination)
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outputStream := conn.link.Writer
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if outputStream != nil {
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if err := outputStream.WriteMultiBuffer(buf.NewMultiBufferValue(payload)); err != nil {
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newError("failed to write first UDP payload").Base(err).WriteToLog(session.ExportIDToError(ctx))
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conn.cancel()
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return
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}
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}
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}
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func handleInput(ctx context.Context, conn *connEntry, callback ResponseCallback) {
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defer conn.cancel()
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input := conn.link.Reader
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timer := conn.timer
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for {
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select {
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case <-ctx.Done():
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return
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default:
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}
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mb, err := input.ReadMultiBuffer()
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if err != nil {
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newError("failed to handle UDP input").Base(err).WriteToLog(session.ExportIDToError(ctx))
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return
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}
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timer.Update()
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for _, b := range mb {
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callback(ctx, b)
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}
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}
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}
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