forked from sourcegraph/go-langserver
/
langserver-go.go
95 lines (80 loc) · 1.85 KB
/
langserver-go.go
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package main
import (
"context"
"flag"
"fmt"
"io"
"log"
"net"
"os"
"github.com/sourcegraph/go-langserver/langserver"
"github.com/sourcegraph/jsonrpc2"
)
var (
mode = flag.String("mode", "stdio", "communication mode (stdio|tcp)")
addr = flag.String("addr", ":4389", "server listen address (tcp)")
trace = flag.Bool("trace", false, "print all requests and responses")
logfile = flag.String("logfile", "", "also log to this file (in addition to stderr)")
)
func main() {
flag.Parse()
log.SetFlags(0)
if err := run(); err != nil {
fmt.Fprintln(os.Stderr, err)
os.Exit(1)
}
}
func run() error {
var logW io.Writer
if *logfile == "" {
logW = os.Stderr
} else {
f, err := os.Create(*logfile)
if err != nil {
return err
}
defer f.Close()
logW = io.MultiWriter(os.Stderr, f)
}
log.SetOutput(logW)
var connOpt []jsonrpc2.ConnOpt
if *trace {
connOpt = append(connOpt, jsonrpc2.LogMessages(log.New(logW, "", 0)))
}
switch *mode {
case "tcp":
lis, err := net.Listen("tcp", *addr)
if err != nil {
return err
}
defer lis.Close()
log.Println("langserver-go: listening on", *addr)
for {
conn, err := lis.Accept()
if err != nil {
return err
}
jsonrpc2.NewConn(context.Background(), conn, langserver.NewHandler(), connOpt...)
}
case "stdio":
log.Println("langserver-go: reading on stdin, writing on stdout")
<-jsonrpc2.NewConn(context.Background(), stdrwc{}, langserver.NewHandler(), connOpt...).DisconnectNotify()
log.Println("connection closed")
return nil
default:
return fmt.Errorf("invalid mode %q", *mode)
}
}
type stdrwc struct{}
func (stdrwc) Read(p []byte) (int, error) {
return os.Stdin.Read(p)
}
func (stdrwc) Write(p []byte) (int, error) {
return os.Stdout.Write(p)
}
func (stdrwc) Close() error {
if err := os.Stdin.Close(); err != nil {
return err
}
return os.Stdout.Close()
}