forked from INFURA/go-ethlibs
/
websocket.go
52 lines (41 loc) · 1.2 KB
/
websocket.go
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package node
import (
"context"
"io/ioutil"
"net/url"
"github.com/gorilla/websocket"
"github.com/pkg/errors"
)
type websocketTransport struct {
*loopingTransport
}
// newWebsocketTransport creates a Connection to the passed in URL. Use the supplied Context to shutdown the connection by
// cancelling or otherwise aborting the context.
func newWebsocketTransport(ctx context.Context, addr *url.URL) (transport, error) {
wsConn, _, err := websocket.DefaultDialer.DialContext(ctx, addr.String(), nil)
if err != nil {
return nil, err
}
readMessage := func() (payload []byte, err error) {
typ, r, err := wsConn.NextReader()
if err != nil {
return nil, errors.Wrap(err, "error reading from backend websocket connection")
}
if typ != websocket.TextMessage {
return nil, nil
}
payload, err = ioutil.ReadAll(r)
if err != nil {
return nil, errors.Wrap(err, "error reading from backend websocket connection")
}
return payload, err
}
writeMessage := func(payload []byte) error {
err := wsConn.WriteMessage(websocket.TextMessage, payload)
return err
}
t := websocketTransport{
loopingTransport: newLoopingTransport(ctx, wsConn, readMessage, writeMessage),
}
return &t, nil
}