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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 cmd
import (
"context"
"encoding/json"
"errors"
"flag"
"fmt"
"log"
"os"
"cuelang.org/go/internal/golangorgx/gopls/lsprpc"
"cuelang.org/go/internal/golangorgx/gopls/protocol/command"
)
type remote struct {
app *Application
subcommands
// For backward compatibility, allow aliasing this command (it was previously
// called 'inspect').
//
// TODO(rFindley): delete this after allowing some transition time in case
// there were any users of 'inspect' (I suspect not).
alias string
}
func newRemote(app *Application, alias string) *remote {
return &remote{
app: app,
subcommands: subcommands{
&listSessions{app: app},
&startDebugging{app: app},
},
alias: alias,
}
}
func (r *remote) Name() string {
if r.alias != "" {
return r.alias
}
return "remote"
}
func (r *remote) Parent() string { return r.app.Name() }
func (r *remote) ShortHelp() string {
short := "interact with the gopls daemon"
if r.alias != "" {
short += " (deprecated: use 'remote')"
}
return short
}
// listSessions is an inspect subcommand to list current sessions.
type listSessions struct {
app *Application
}
func (c *listSessions) Name() string { return "sessions" }
func (c *listSessions) Parent() string { return c.app.Name() }
func (c *listSessions) Usage() string { return "" }
func (c *listSessions) ShortHelp() string {
return "print information about current gopls sessions"
}
const listSessionsExamples = `
Examples:
1) list sessions for the default daemon:
$ gopls -remote=auto remote sessions
or just
$ gopls remote sessions
2) list sessions for a specific daemon:
$ gopls -remote=localhost:8082 remote sessions
`
func (c *listSessions) DetailedHelp(f *flag.FlagSet) {
fmt.Fprint(f.Output(), listSessionsExamples)
printFlagDefaults(f)
}
func (c *listSessions) Run(ctx context.Context, args ...string) error {
remote := c.app.Remote
if remote == "" {
remote = "auto"
}
state, err := lsprpc.QueryServerState(ctx, remote)
if err != nil {
return err
}
v, err := json.MarshalIndent(state, "", "\t")
if err != nil {
log.Fatal(err)
}
os.Stdout.Write(v)
return nil
}
type startDebugging struct {
app *Application
}
func (c *startDebugging) Name() string { return "debug" }
func (c *startDebugging) Usage() string { return "[host:port]" }
func (c *startDebugging) ShortHelp() string {
return "start the debug server"
}
const startDebuggingExamples = `
Examples:
1) start a debug server for the default daemon, on an arbitrary port:
$ gopls -remote=auto remote debug
or just
$ gopls remote debug
2) start for a specific daemon, on a specific port:
$ gopls -remote=localhost:8082 remote debug localhost:8083
`
func (c *startDebugging) DetailedHelp(f *flag.FlagSet) {
fmt.Fprint(f.Output(), startDebuggingExamples)
printFlagDefaults(f)
}
func (c *startDebugging) Run(ctx context.Context, args ...string) error {
if len(args) > 1 {
fmt.Fprintln(os.Stderr, c.Usage())
return errors.New("invalid usage")
}
remote := c.app.Remote
if remote == "" {
remote = "auto"
}
debugAddr := ""
if len(args) > 0 {
debugAddr = args[0]
}
debugArgs := command.DebuggingArgs{
Addr: debugAddr,
}
var result command.DebuggingResult
if err := lsprpc.ExecuteCommand(ctx, remote, command.StartDebugging.ID(), debugArgs, &result); err != nil {
return err
}
if len(result.URLs) == 0 {
return errors.New("no debugging URLs")
}
for _, url := range result.URLs {
fmt.Printf("debugging on %s\n", url)
}
return nil
}
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