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net_ws.go
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net_ws.go
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package blockstore
import (
"bytes"
"context"
"github.com/gorilla/websocket"
"github.com/libp2p/go-msgio"
"golang.org/x/xerrors"
)
type wsWrapper struct {
wc *websocket.Conn
nextMsg []byte
}
func (w *wsWrapper) Read(b []byte) (int, error) {
return 0, xerrors.New("read unsupported")
}
func (w *wsWrapper) ReadMsg() ([]byte, error) {
if w.nextMsg != nil {
nm := w.nextMsg
w.nextMsg = nil
return nm, nil
}
mt, r, err := w.wc.NextReader()
if err != nil {
return nil, err
}
switch mt {
case websocket.BinaryMessage, websocket.TextMessage:
default:
return nil, xerrors.Errorf("unexpected message type")
}
// todo pool
// todo limit sizes
var mbuf bytes.Buffer
if _, err := mbuf.ReadFrom(r); err != nil {
return nil, err
}
return mbuf.Bytes(), nil
}
func (w *wsWrapper) ReleaseMsg(bytes []byte) {
// todo use a pool
}
func (w *wsWrapper) NextMsgLen() (int, error) {
if w.nextMsg != nil {
return len(w.nextMsg), nil
}
mt, msg, err := w.wc.ReadMessage()
if err != nil {
return 0, err
}
switch mt {
case websocket.BinaryMessage, websocket.TextMessage:
default:
return 0, xerrors.Errorf("unexpected message type")
}
w.nextMsg = msg
return len(w.nextMsg), nil
}
func (w *wsWrapper) Write(bytes []byte) (int, error) {
return 0, xerrors.New("write unsupported")
}
func (w *wsWrapper) WriteMsg(bytes []byte) error {
return w.wc.WriteMessage(websocket.BinaryMessage, bytes)
}
func (w *wsWrapper) Close() error {
return w.wc.Close()
}
var _ msgio.ReadWriteCloser = &wsWrapper{}
func wsConnToMio(wc *websocket.Conn) msgio.ReadWriteCloser {
return &wsWrapper{
wc: wc,
}
}
func HandleNetBstoreWS(ctx context.Context, bs Blockstore, wc *websocket.Conn) *NetworkStoreHandler {
return HandleNetBstoreStream(ctx, bs, wsConnToMio(wc))
}
func NewNetworkStoreWS(wc *websocket.Conn) *NetworkStore {
return NewNetworkStore(wsConnToMio(wc))
}