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// Copyright 2018 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 cmd
import (
"context"
"flag"
"fmt"
"io"
"log"
"os"
"strings"
"time"
"golang.org/x/tools/internal/fakenet"
"golang.org/x/tools/internal/jsonrpc2"
"golang.org/x/tools/internal/lsp/cache"
"golang.org/x/tools/internal/lsp/debug"
"golang.org/x/tools/internal/lsp/lsprpc"
"golang.org/x/tools/internal/lsp/protocol"
"golang.org/x/tools/internal/tool"
errors "golang.org/x/xerrors"
)
// Serve is a struct that exposes the configurable parts of the LSP server as
// flags, in the right form for tool.Main to consume.
type Serve struct {
Logfile string `flag:"logfile" help:"filename to log to. if value is \"auto\", then logging to a default output file is enabled"`
Mode string `flag:"mode" help:"no effect"`
Port int `flag:"port" help:"port on which to run gopls for debugging purposes"`
Address string `flag:"listen" help:"address on which to listen for remote connections. If prefixed by 'unix;', the subsequent address is assumed to be a unix domain socket. Otherwise, TCP is used."`
IdleTimeout time.Duration `flag:"listen.timeout" help:"when used with -listen, shut down the server when there are no connected clients for this duration"`
Trace bool `flag:"rpc.trace" help:"print the full rpc trace in lsp inspector format"`
Debug string `flag:"debug" help:"serve debug information on the supplied address"`
RemoteListenTimeout time.Duration `flag:"remote.listen.timeout" help:"when used with -remote=auto, the -listen.timeout value used to start the daemon"`
RemoteDebug string `flag:"remote.debug" help:"when used with -remote=auto, the -debug value used to start the daemon"`
RemoteLogfile string `flag:"remote.logfile" help:"when used with -remote=auto, the -logfile value used to start the daemon"`
app *Application
}
func (s *Serve) Name() string { return "serve" }
func (s *Serve) Usage() string { return "" }
func (s *Serve) ShortHelp() string {
return "run a server for Go code using the Language Server Protocol"
}
func (s *Serve) DetailedHelp(f *flag.FlagSet) {
fmt.Fprint(f.Output(), `
The server communicates using JSONRPC2 on stdin and stdout, and is intended to be run directly as
a child of an editor process.
gopls server flags are:
`)
f.PrintDefaults()
}
// Run configures a server based on the flags, and then runs it.
// It blocks until the server shuts down.
func (s *Serve) Run(ctx context.Context, args ...string) error {
if len(args) > 0 {
return tool.CommandLineErrorf("server does not take arguments, got %v", args)
}
di := debug.GetInstance(ctx)
isDaemon := s.Address != "" || s.Port != 0
if di != nil {
closeLog, err := di.SetLogFile(s.Logfile, isDaemon)
if err != nil {
return err
}
defer closeLog()
di.ServerAddress = s.Address
di.DebugAddress = s.Debug
di.Serve(ctx)
di.MonitorMemory(ctx)
}
var ss jsonrpc2.StreamServer
if s.app.Remote != "" {
network, addr := parseAddr(s.app.Remote)
ss = lsprpc.NewForwarder(network, addr,
lsprpc.RemoteDebugAddress(s.RemoteDebug),
lsprpc.RemoteListenTimeout(s.RemoteListenTimeout),
lsprpc.RemoteLogfile(s.RemoteLogfile),
)
} else {
ss = lsprpc.NewStreamServer(cache.New(ctx, s.app.options), isDaemon)
}
var network, addr string
if s.Address != "" {
network, addr = parseAddr(s.Address)
}
if s.Port != 0 {
network = "tcp"
addr = fmt.Sprintf(":%v", s.Port)
}
if addr != "" {
log.Printf("Gopls daemon: listening on %s network, address %s...", network, addr)
defer log.Printf("Gopls daemon: exiting")
return jsonrpc2.ListenAndServe(ctx, network, addr, ss, s.IdleTimeout)
}
stream := jsonrpc2.NewHeaderStream(fakenet.NewConn("stdio", os.Stdin, os.Stdout))
if s.Trace && di != nil {
stream = protocol.LoggingStream(stream, di.LogWriter)
}
conn := jsonrpc2.NewConn(stream)
err := ss.ServeStream(ctx, conn)
if errors.Is(err, io.EOF) {
return nil
}
return err
}
// parseAddr parses the -listen flag in to a network, and address.
func parseAddr(listen string) (network string, address string) {
// Allow passing just -remote=auto, as a shorthand for using automatic remote
// resolution.
if listen == lsprpc.AutoNetwork {
return lsprpc.AutoNetwork, ""
}
if parts := strings.SplitN(listen, ";", 2); len(parts) == 2 {
return parts[0], parts[1]
}
return "tcp", listen
}
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