/
serverwrap.go
122 lines (99 loc) · 2.54 KB
/
serverwrap.go
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package lsproto
import (
"bytes"
"context"
"fmt"
"io"
"strings"
"text/template"
"github.com/jmigpin/editor/v2/util/iout"
"github.com/jmigpin/editor/v2/util/osutil"
)
type ServerWrap struct {
Cmd *osutil.Cmd
rwc *rwc // just for IO mode (can be nil)
}
//----------
func StartServerWrapTCP(ctx context.Context, cmdTmpl string, w io.Writer) (*ServerWrap, string, error) {
// multiple editors can have multiple server wraps
//port, err := osutil.GetFreeTcpPort()
//if err != nil {
// return nil, "", err
//}
port := osutil.RandomPort(3, 10000, 65000)
// template vars
addr := fmt.Sprintf("127.0.0.1:%v", port)
cmd, err := cmdTemplate(cmdTmpl, addr)
if err != nil {
return nil, "", err
}
sw := newServerWrapCommon(ctx, cmd)
// get lsp server output in tcp mode
if w != nil {
if err := sw.Cmd.SetupStdio(nil, w, w); err != nil {
sw.Cmd.Cancel() // start will not run, clear ctx
return nil, "", err
}
}
if err := sw.Cmd.Start(); err != nil {
return nil, "", err
}
return sw, addr, nil
}
func StartServerWrapIO(ctx context.Context, cmd string, stderr io.Writer, li *LangInstance) (*ServerWrap, io.ReadWriteCloser, error) {
sw := newServerWrapCommon(ctx, cmd)
pr1, pw1 := io.Pipe()
pr2, pw2 := io.Pipe()
if err := sw.Cmd.SetupStdio(pr1, pw2, stderr); err != nil {
sw.Cmd.Cancel() // start will not run, clear ctx
return nil, nil, err
}
sw.rwc = &rwc{} // also keep for later close
sw.rwc.WriteCloser = pw1
sw.rwc.ReadCloser = pr2
if err := sw.Cmd.Start(); err != nil {
sw.rwc.Close() // wait will not be called, clear resources
return nil, nil, err
}
return sw, sw.rwc, nil
}
func newServerWrapCommon(ctx context.Context, cmd string) *ServerWrap {
sw := &ServerWrap{}
args := strings.Split(cmd, " ") // TODO: escapes
sw.Cmd = osutil.NewCmd(ctx, args...)
return sw
}
//----------
func (sw *ServerWrap) Wait() error {
if sw.rwc != nil { // can be nil if in tcp mode
// was set outside cmd, close after cmd.wait
defer sw.rwc.Close()
}
return sw.Cmd.Wait()
}
//----------
type rwc struct {
io.ReadCloser
io.WriteCloser
}
func (rwc *rwc) Close() error {
me := iout.MultiError{}
me.Add(rwc.ReadCloser.Close())
me.Add(rwc.WriteCloser.Close())
return me.Result()
}
//----------
func cmdTemplate(cmdTmpl, addr string) (string, error) {
// build template
tmpl, err := template.New("").Parse(cmdTmpl)
if err != nil {
return "", err
}
// fill template
var data = struct{ Addr string }{addr}
var out bytes.Buffer
if err := tmpl.Execute(&out, data); err != nil {
return "", err
}
return out.String(), nil
}