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source.go
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source.go
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package teleportation
import (
"fmt"
"io"
"net"
"sync"
"sync/atomic"
"github.com/sirupsen/logrus"
"golang.org/x/sync/errgroup"
"github.com/PeerXu/meepo/pkg/ofn"
"github.com/PeerXu/meepo/pkg/transport"
mgroup "github.com/PeerXu/meepo/pkg/util/group"
)
type TeleportationSource struct {
opt ofn.Option
logger logrus.FieldLogger
idx int32
closed int32
name string
source net.Addr
sink net.Addr
transport transport.Transport
datachannels map[string]transport.DataChannel
dialRequests chan *DialRequest
doTeleportFunc DoTeleportFunc
onCloseHandler OnCloseHandler
onErrorHandler OnErrorHandler
datachannelsMtx sync.Mutex
lisMtx sync.Mutex
}
func (ts *TeleportationSource) getLogger() logrus.FieldLogger {
return ts.logger.WithFields(logrus.Fields{
"#instance": "TeleportationSource",
"name": ts.Name(),
})
}
func (ts *TeleportationSource) onError(err error) {
defer ts.close()
if ts.onErrorHandler != nil {
ts.onErrorHandler(err)
}
}
func (ts *TeleportationSource) close() error {
if atomic.SwapInt32(&ts.closed, 1) == 1 {
return nil
}
var eg errgroup.Group
ts.datachannelsMtx.Lock()
for _, dc := range ts.datachannels {
eg.Go(dc.Close)
}
ts.datachannelsMtx.Unlock()
return eg.Wait()
}
func (ts *TeleportationSource) requestLoop() {
logger := ts.getLogger().WithField("#method", "fetchConnLoop")
defer logger.Tracef("exited")
for {
dr, ok := <-ts.dialRequests
if !ok {
return
}
go ts.onDial(dr)
}
}
func (ts *TeleportationSource) onDial(dr *DialRequest) {
var dc transport.DataChannel
var err error
conn := dr.Conn
rg := mgroup.NewRaceGroupFunc()
logger := ts.getLogger().WithField("#method", "onDial")
outerConnCloser := conn.Close
defer func() {
if outerConnCloser != nil {
outerConnCloser()
}
}()
tp := ts.Transport()
idx := atomic.AddInt32(&ts.idx, 1)
label := fmt.Sprintf("%s:%d", ts.Name(), idx)
if err := ts.doTeleportFunc(label); err != nil {
logger.WithError(err).Debugf("failed to do teleport func")
rg.Go(mgroup.DONE)
return
}
logger.Tracef("do teleport func")
dc, err = tp.CreateDataChannel(
label,
transport.WithOrdered(true),
)
if err != nil {
logger.WithError(err).Debugf("failed to create data channel")
rg.Go(mgroup.DONE)
return
}
outerDataChannelCloser := dc.Close
defer func() {
if outerDataChannelCloser != nil {
outerDataChannelCloser()
}
}()
logger.Tracef("create data channel")
dc.OnOpen(func() {
innerLogger := ts.getLogger().WithFields(logrus.Fields{
"#method": "dataChannelCopyLoop",
"label": dc.Label(),
})
rg.Go(func() (interface{}, error) {
_, err := io.Copy(dc, conn)
innerLogger.WithError(err).Tracef("conn->dc closed")
return nil, err
})
rg.Go(func() (interface{}, error) {
_, err := io.Copy(conn, dc)
innerLogger.WithError(err).Tracef("conn<-dc closed")
return nil, err
})
go func() {
_, err := rg.Wait()
innerLogger.WithError(conn.Close()).Tracef("conn closed")
innerLogger.WithError(dc.Close()).Tracef("datachannel closed")
ts.datachannelsMtx.Lock()
delete(ts.datachannels, dc.Label())
ts.datachannelsMtx.Unlock()
innerLogger.Tracef("remove from data channels")
if dr.Quit != nil {
close(dr.Quit)
innerLogger.Tracef("send quit signal")
}
innerLogger.WithError(err).Tracef("done")
}()
logger.Tracef("data channel opened")
})
ts.datachannelsMtx.Lock()
ts.datachannels[label] = dc
ts.datachannelsMtx.Unlock()
logger.Tracef("add to data channels")
outerConnCloser = nil
outerDataChannelCloser = nil
logger.Tracef("done")
}
func (ts *TeleportationSource) Name() string {
return ts.name
}
func (ts *TeleportationSource) Source() net.Addr {
return ts.source
}
func (ts *TeleportationSource) Sink() net.Addr {
return ts.sink
}
func (ts *TeleportationSource) Portal() Portal {
return PortalSource
}
func (ts *TeleportationSource) Transport() transport.Transport {
return ts.transport
}
func (ts *TeleportationSource) DataChannels() []transport.DataChannel {
var dcs []transport.DataChannel
ts.datachannelsMtx.Lock()
for _, dc := range ts.datachannels {
dcs = append(dcs, dc)
}
ts.datachannelsMtx.Unlock()
return dcs
}
func (ts *TeleportationSource) Close() error {
if ts.onCloseHandler != nil {
ts.onCloseHandler()
}
return ts.close()
}
func newNewteleportationSourceOptions() ofn.Option {
return ofn.NewOption(map[string]interface{}{})
}
func NewTeleportationSource(opts ...NewTeleportationSourceOption) (*TeleportationSource, error) {
var logger logrus.FieldLogger
var name string
var source, sink net.Addr
var tp transport.Transport
var ok bool
var dtf DoTeleportFunc
var och OnCloseHandler
var oeh OnErrorHandler
var drc chan *DialRequest
var val interface{}
o := newNewteleportationSourceOptions()
for _, opt := range opts {
opt(o)
}
if logger, ok = o.Get("logger").Inter().(logrus.FieldLogger); !ok {
logger = logrus.New()
}
if source, ok = o.Get("source").Inter().(net.Addr); !ok {
return nil, fmt.Errorf("Require source")
}
if sink, ok = o.Get("sink").Inter().(net.Addr); !ok {
return nil, fmt.Errorf("Require sink")
}
if tp, ok = o.Get("transport").Inter().(transport.Transport); !ok {
return nil, fmt.Errorf("Require transport")
}
if name, ok = o.Get("name").Inter().(string); !ok {
name = fmt.Sprintf("%s:%s", sink.Network(), sink.String())
}
if val = o.Get("doTeleportFunc").Inter(); val != nil {
dtf = val.(DoTeleportFunc)
}
if val = o.Get("onCloseHandler").Inter(); val != nil {
och = val.(OnCloseHandler)
}
if val = o.Get("onErrorHandler").Inter(); val != nil {
oeh = val.(OnErrorHandler)
}
if val = o.Get("dialRequestChannel").Inter(); val != nil {
drc = val.(chan *DialRequest)
}
ts := &TeleportationSource{
opt: o,
logger: logger,
name: name,
source: source,
sink: sink,
transport: tp,
datachannels: make(map[string]transport.DataChannel),
doTeleportFunc: dtf,
onCloseHandler: och,
onErrorHandler: oeh,
dialRequests: drc,
}
go ts.requestLoop()
return ts, nil
}