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For tests (and perhaps later, for daemon discovery), unix domain sockets offer advantages over TCP: we can know the exact socket address that will be used when starting a server subprocess. They also offer performance and security advantages over TCP, and were specifically requested on golang.org/issues/34111. This CL adds support for listening on UDS, and uses this to implement an additional regtest environment mode that starts up an external process. This mode is disabled by default, but may be enabled by the -enable_gopls_subprocess_tests. The regtest TestMain may be hijacked to instead run as gopls, if a special environment variable is set. This allows the the test runner to start a separate process by using os.Argv[0]. The -gopls_test_binary flag may be used to point tests at a separate gopls binary. Updates golang/go#36879 Updates golang/go#34111 Change-Id: I1cfdf55040e81ffa69a6726878a96529e5522e82 Reviewed-on: https://go-review.googlesource.com/c/tools/+/218839 Run-TryBot: Robert Findley <rfindley@google.com> TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by: Heschi Kreinick <heschi@google.com>
69 lines
1.9 KiB
Go
69 lines
1.9 KiB
Go
// Copyright 2020 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package jsonrpc2
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import (
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"context"
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"log"
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"net"
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)
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// NOTE: This file provides an experimental API for serving multiple remote
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// jsonrpc2 clients over the network. For now, it is intentionally similar to
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// net/http, but that may change in the future as we figure out the correct
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// semantics.
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// A StreamServer is used to serve incoming jsonrpc2 clients communicating over
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// a newly created stream.
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type StreamServer interface {
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ServeStream(context.Context, Stream) error
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}
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// The ServerFunc type is an adapter that implements the StreamServer interface
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// using an ordinary function.
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type ServerFunc func(context.Context, Stream) error
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// ServeStream calls f(ctx, s).
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func (f ServerFunc) ServeStream(ctx context.Context, s Stream) error {
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return f(ctx, s)
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}
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// HandlerServer returns a StreamServer that handles incoming streams using the
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// provided handler.
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func HandlerServer(h Handler) StreamServer {
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return ServerFunc(func(ctx context.Context, s Stream) error {
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conn := NewConn(s)
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conn.AddHandler(h)
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return conn.Run(ctx)
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})
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}
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// ListenAndServe starts an jsonrpc2 server on the given address. It exits only
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// on error.
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func ListenAndServe(ctx context.Context, network, addr string, server StreamServer) error {
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ln, err := net.Listen(network, addr)
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if err != nil {
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return err
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}
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return Serve(ctx, ln, server)
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}
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// Serve accepts incoming connections from the network, and handles them using
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// the provided server. It exits only on error.
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func Serve(ctx context.Context, ln net.Listener, server StreamServer) error {
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for {
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netConn, err := ln.Accept()
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if err != nil {
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return err
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}
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stream := NewHeaderStream(netConn, netConn)
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go func() {
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if err := server.ServeStream(ctx, stream); err != nil {
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log.Printf("serving stream: %v", err)
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}
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}()
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}
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}
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