Butler stream servers can generate client address.

logdog/client/cmd/logdog_butler/main_windows.go

 // Copyright 2015 The LUCI Authors. All rights reserved.
 // Use of this source code is governed under the Apache License, Version 2.0
 // that can be found in the LICENSE file.
 
 package main
 
 import (
         "errors"
-        "fmt"
         "os"
 
         "github.com/luci/luci-go/logdog/client/butler/streamserver"
         "golang.org/x/net/context"
 )
 
 const (
         // An example stream server URI.
         //
         // This expands to: //localhost/pipe/<name>
@@ skipping 20 matching lines @@
         return value, nil
 }
 
 // Validates that the URI is correct for Windows.
 func (u streamServerURI) Validate() error {
         _, err := u.Parse()
         return err
 }
 
 // Create a Windows stream server.
-func createStreamServer(ctx context.Context, uri streamServerURI) streamserver.StreamServer {
+func createStreamServer(ctx context.Context, uri streamServerURI) (streamserver.StreamServer, error) {
         name, err := uri.Parse()
         if err != nil {
                 panic("Failed to parse stream server URI.")
         }
-        return streamserver.NewNamedPipeServer(ctx, fmt.Sprintf(`\\.\pipe\%s`, name))
+        return streamserver.NewNamedPipeServer(ctx, name)
 }