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server.go
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server.go
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// Copyright 2020 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
// Package lsp/server implements a jsonrpc2.StreamServer that may be used to
// serve the LSP on a jsonrpc2 channel.
package server
import (
"context"
"github.com/anz-bank/sysl/pkg/lsp/framework/jsonrpc2"
"github.com/anz-bank/sysl/pkg/lsp/framework/lsp/protocol"
"github.com/anz-bank/sysl/pkg/lsp/impl"
"github.com/pkg/errors"
)
// The StreamServer type is a jsonrpc2.StreamServer that handles incoming
// streams as a new LSP session.
type StreamServer struct {
// serverForTest may be set to a test fake for testing.
serverForTest protocol.Server
}
// NewStreamServer creates a StreamServer
func NewStreamServer() *StreamServer {
return &StreamServer{}
}
// ServeStream implements the jsonrpc2.StreamServer interface, by handling
// incoming streams using a new lsp server.
func (s *StreamServer) ServeStream(ctx context.Context, stream jsonrpc2.Stream) error {
conn := jsonrpc2.NewConn(stream)
client := protocol.ClientDispatcher(conn)
server := s.serverForTest
if server == nil {
server = impl.NewServer(client)
}
// Clients may or may not send a shutdown message. Make sure the server is
// shut down.
// TODO(rFindley): this shutdown should perhaps be on a disconnected context.
defer server.Shutdown(ctx)
conn.Go(ctx, protocol.Handlers(protocol.ServerHandler(server, jsonrpc2.MethodNotFound)))
select {
case <-conn.Done():
client.Close()
}
var err error
if conn.Err() != nil {
err = errors.Errorf("remote disconnected: %v", conn.Err())
}
return err
}