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stream.go
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/
stream.go
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// Copyright (c) Microsoft Corporation. All rights reserved.
// Licensed under the MIT License.
package vsrpc
import (
"context"
"encoding/json"
"fmt"
"github.com/gorilla/websocket"
"go.lsp.dev/jsonrpc2"
)
// wsStream adapts the websocket.Conn to jsonrpc2.Stream interface
type wsStream struct {
c *websocket.Conn
}
// Close implements jsonrpc2.Stream.
func (*wsStream) Close() error {
// TODO(azure/azure-dev#3286): Need to think about what to do here. Close the conn?
return nil
}
// Read implements jsonrpc2.Stream.
func (s *wsStream) Read(ctx context.Context) (jsonrpc2.Message, int64, error) {
mt, data, err := s.c.ReadMessage()
if err != nil {
return nil, 0, err
}
if mt != websocket.TextMessage {
return nil, 0, fmt.Errorf("unexpected message type: %v", mt)
}
msg, err := jsonrpc2.DecodeMessage(data)
if err != nil {
return nil, 0, err
}
return msg, int64(len(data)), nil
}
// Write implements jsonrpc2.Stream.
func (s *wsStream) Write(ctx context.Context, msg jsonrpc2.Message) (int64, error) {
data, err := json.Marshal(msg)
if err != nil {
return 0, fmt.Errorf("marshaling message: %w", err)
}
if err := s.c.WriteMessage(websocket.TextMessage, data); err != nil {
return 0, err
}
return int64(len(data)), nil
}
func newWebSocketStream(c *websocket.Conn) *wsStream {
return &wsStream{c: c}
}