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inmem.go
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inmem.go
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package libchan
import (
"encoding/binary"
"errors"
"io"
"net"
"reflect"
"sync"
"github.com/dmcgowan/go/codec"
)
// Pipe returns an inmemory Sender/Receiver pair.
func Pipe() (Receiver, Sender) {
session := createStreamSession()
return session.createPipe()
}
type streamSession struct {
pipeLock sync.Mutex
pipeCount uint64
pipeReaders map[uint64]*io.PipeReader
pipeWriters map[uint64]*io.PipeWriter
handler codec.Handle
referenceLock sync.Mutex
referenceID uint64
byteStreams map[uint64]*byteStream
}
func createStreamSession() *streamSession {
session := &streamSession{
pipeReaders: make(map[uint64]*io.PipeReader),
pipeWriters: make(map[uint64]*io.PipeWriter),
referenceID: 2,
byteStreams: make(map[uint64]*byteStream),
}
session.handler = getMsgPackHandler(session)
return session
}
func (s *streamSession) createPipe() (Receiver, Sender) {
r, w := io.Pipe()
s.pipeLock.Lock()
pipeID := s.pipeCount + 1
s.pipeCount = pipeID
s.pipeReaders[pipeID] = r
s.pipeWriters[pipeID] = w
s.pipeLock.Unlock()
recv := &pipeReceiver{pipeID, s, r, codec.NewDecoder(r, s.handler)}
send := &pipeSender{pipeID, s, w, codec.NewEncoder(w, s.handler)}
return recv, send
}
func (s *streamSession) newByteStream() (io.ReadWriteCloser, error) {
c1, c2 := net.Pipe()
bs := &byteStream{
Conn: c1,
referenceID: s.referenceID,
session: s,
}
s.referenceLock.Lock()
s.byteStreams[s.referenceID] = bs
s.byteStreams[s.referenceID+1] = &byteStream{
Conn: c2,
referenceID: s.referenceID + 1,
session: s,
}
s.referenceID = s.referenceID + 2
s.referenceLock.Unlock()
return bs, nil
}
func (s *streamSession) encodeReceiver(v reflect.Value) ([]byte, error) {
bs := v.Interface().(pipeReceiver)
if bs.pipeID == 0 {
return nil, errors.New("bad type")
}
var buf [8]byte
written := binary.PutUvarint(buf[:], uint64(bs.pipeID))
return buf[:written], nil
}
func (s *streamSession) decodeReceiver(v reflect.Value, b []byte) error {
pipeID, readN := binary.Uvarint(b)
if readN == 0 {
return errors.New("bad reference id")
}
r, ok := s.pipeReaders[pipeID]
if !ok {
return errors.New("receiver does not exist")
}
v.Set(reflect.ValueOf(pipeReceiver{pipeID, s, r, codec.NewDecoder(r, s.handler)}))
return nil
}
func (s *streamSession) encodeSender(v reflect.Value) ([]byte, error) {
sender := v.Interface().(pipeSender)
if sender.pipeID == 0 {
return nil, errors.New("bad type")
}
var buf [8]byte
written := binary.PutUvarint(buf[:], uint64(sender.pipeID))
return buf[:written], nil
}
func (s *streamSession) decodeSender(v reflect.Value, b []byte) error {
pipeID, readN := binary.Uvarint(b)
if readN == 0 {
return errors.New("bad reference id")
}
w, ok := s.pipeWriters[pipeID]
if !ok {
return errors.New("receiver does not exist")
}
v.Set(reflect.ValueOf(pipeSender{pipeID, s, w, codec.NewEncoder(w, s.handler)}))
return nil
}
func (s *streamSession) encodeStream(v reflect.Value) ([]byte, error) {
bs := v.Interface().(byteStream)
if bs.referenceID == 0 {
return nil, errors.New("bad type")
}
var buf [8]byte
written := binary.PutUvarint(buf[:], uint64(bs.referenceID)^0x01)
return buf[:written], nil
}
func (s *streamSession) decodeStream(v reflect.Value, b []byte) error {
referenceID, readN := binary.Uvarint(b)
if readN == 0 {
return errors.New("bad reference id")
}
bs, ok := s.byteStreams[referenceID]
if !ok {
return errors.New("byte stream does not exist")
}
if bs != nil {
v.Set(reflect.ValueOf(*bs))
}
return nil
}
// Wrappers to cue a copy of a previously decoded object
type pipeSenderWrapper struct{ *pipeSender }
type pipeReceiverWrapper struct{ *pipeReceiver }
type byteStreamWrapper struct{ *byteStream }
func (s *streamSession) decodeSenderWrapper(v reflect.Value, b []byte) error {
ps := &pipeSender{}
v.FieldByName("pipeSender").Set(reflect.ValueOf(ps))
return s.decodeSender(reflect.ValueOf(ps).Elem(), b)
}
func (s *streamSession) decodeReceiverWrapper(v reflect.Value, b []byte) error {
pr := &pipeReceiver{}
v.FieldByName("pipeReceiver").Set(reflect.ValueOf(pr))
return s.decodeReceiver(reflect.ValueOf(pr).Elem(), b)
}
func (s *streamSession) decodeByteStreamWrapper(v reflect.Value, b []byte) error {
bs := &byteStream{}
v.FieldByName("byteStream").Set(reflect.ValueOf(bs))
return s.decodeStream(reflect.ValueOf(bs).Elem(), b)
}
// Internal definitions early, does not follow protocol because does not
// interact with external processes
func getMsgPackHandler(session *streamSession) *codec.MsgpackHandle {
mh := &codec.MsgpackHandle{WriteExt: true}
mh.RawToString = true
err := mh.AddExt(reflect.TypeOf(pipeReceiverWrapper{}), 1, nil, session.decodeReceiverWrapper)
if err != nil {
panic(err)
}
err = mh.AddExt(reflect.TypeOf(pipeReceiver{}), 1, session.encodeReceiver, nil)
if err != nil {
panic(err)
}
err = mh.AddExt(reflect.TypeOf(pipeSenderWrapper{}), 2, nil, session.decodeSenderWrapper)
if err != nil {
panic(err)
}
err = mh.AddExt(reflect.TypeOf(pipeSender{}), 2, session.encodeSender, nil)
if err != nil {
panic(err)
}
err = mh.AddExt(reflect.TypeOf(byteStreamWrapper{}), 3, nil, session.decodeByteStreamWrapper)
if err != nil {
panic(err)
}
err = mh.AddExt(reflect.TypeOf(byteStream{}), 3, session.encodeStream, nil)
if err != nil {
panic(err)
}
return mh
}
type pipeSender struct {
pipeID uint64
session *streamSession
p *io.PipeWriter
encoder *codec.Encoder
}
func (w *pipeSender) Send(message interface{}) error {
mCopy, mErr := w.copyMessage(message)
if mErr != nil {
return mErr
}
return w.encoder.Encode(mCopy)
}
func (w *pipeSender) Close() error {
return w.p.Close()
}
func (w *pipeSender) CreateByteStream() (io.ReadWriteCloser, error) {
return w.session.newByteStream()
}
func (w *pipeSender) CreateNestedReceiver() (Receiver, Sender, error) {
recv, send := w.session.createPipe()
return recv, send, nil
}
func (w *pipeSender) CreateNestedSender() (Sender, Receiver, error) {
recv, send := w.session.createPipe()
return send, recv, nil
}
type pipeReceiver struct {
pipeID uint64
session *streamSession
p *io.PipeReader
decoder *codec.Decoder
}
func (r *pipeReceiver) Receive(message interface{}) error {
return r.decoder.Decode(message)
}
func (r *pipeReceiver) Close() error {
return r.p.Close()
}
type byteStream struct {
net.Conn
referenceID uint64
session *streamSession
}
func (w *pipeSender) copyMessage(message interface{}) (interface{}, error) {
mapCopy, mapOk := message.(map[string]interface{})
if mapOk {
return w.copyChannelMessage(mapCopy)
}
return w.copyStructure(message)
}
func (w *pipeSender) copyValue(v interface{}) (interface{}, error) {
switch val := v.(type) {
case *byteStream:
if val.session != w.session {
return w.copyByteStream(val)
}
case *pipeSender:
if val.session != w.session {
return w.copySender(val)
}
case *pipeReceiver:
if val.session != w.session {
return w.copyReceiver(val)
}
case io.ReadWriteCloser:
return w.copyByteStream(val)
case io.ReadCloser:
return w.copyByteReadStream(val)
case io.WriteCloser:
return w.copyByteWriteStream(val)
case Sender:
return w.copySender(val)
case Receiver:
return w.copyReceiver(val)
case map[string]interface{}:
return w.copyChannelMessage(val)
case map[interface{}]interface{}:
return w.copyChannelInterfaceMessage(val)
default:
if rv := reflect.ValueOf(v); rv.Kind() == reflect.Ptr {
if rv.Elem().Kind() == reflect.Struct {
return w.copyStructValue(rv.Elem())
}
} else if rv.Kind() == reflect.Struct {
return w.copyStructValue(rv)
}
}
return v, nil
}
func (w *pipeSender) copySender(val Sender) (Sender, error) {
recv, send, err := w.CreateNestedReceiver()
if err != nil {
return nil, err
}
go func() {
Copy(val, recv)
val.Close()
}()
return send, nil
}
func (w *pipeSender) copyReceiver(val Receiver) (Receiver, error) {
send, recv, err := w.CreateNestedSender()
if err != nil {
return nil, err
}
go func() {
Copy(send, val)
send.Close()
}()
return recv, nil
}
func (w *pipeSender) copyByteStream(stream io.ReadWriteCloser) (io.ReadWriteCloser, error) {
streamCopy, err := w.session.newByteStream()
if err != nil {
return nil, err
}
go func() {
io.Copy(streamCopy, stream)
streamCopy.Close()
}()
go func() {
io.Copy(stream, streamCopy)
stream.Close()
}()
return streamCopy, nil
}
func (w *pipeSender) copyByteReadStream(stream io.ReadCloser) (io.ReadCloser, error) {
streamCopy, err := w.session.newByteStream()
if err != nil {
return nil, err
}
go func() {
io.Copy(streamCopy, stream)
streamCopy.Close()
stream.Close()
}()
return streamCopy, nil
}
func (w *pipeSender) copyByteWriteStream(stream io.WriteCloser) (io.WriteCloser, error) {
streamCopy, err := w.session.newByteStream()
if err != nil {
return nil, err
}
go func() {
io.Copy(stream, streamCopy)
stream.Close()
}()
return streamCopy, nil
}
func (w *pipeSender) copyChannelMessage(m map[string]interface{}) (interface{}, error) {
mCopy := make(map[string]interface{})
for k, v := range m {
vCopy, vErr := w.copyValue(v)
if vErr != nil {
return nil, vErr
}
mCopy[k] = vCopy
}
return mCopy, nil
}
func (w *pipeSender) copyChannelInterfaceMessage(m map[interface{}]interface{}) (interface{}, error) {
mCopy := make(map[string]interface{})
for k, v := range m {
vCopy, vErr := w.copyValue(v)
if vErr != nil {
return nil, vErr
}
keyStr, ok := k.(string)
if !ok {
return nil, errors.New("invalid non string key")
}
mCopy[keyStr] = vCopy
}
return mCopy, nil
}
func (w *pipeSender) copyStructure(m interface{}) (interface{}, error) {
v := reflect.ValueOf(m)
if v.Kind() == reflect.Ptr {
v = v.Elem()
}
if v.Kind() != reflect.Struct {
return nil, errors.New("invalid non struct type")
}
return w.copyStructValue(v)
}
func (w *pipeSender) copyStructValue(v reflect.Value) (interface{}, error) {
mCopy := make(map[string]interface{})
t := v.Type()
for i := 0; i < v.NumField(); i++ {
vCopy, vErr := w.copyValue(v.Field(i).Interface())
if vErr != nil {
return nil, vErr
}
mCopy[t.Field(i).Name] = vCopy
}
return mCopy, nil
}