LogDog: Add Butler stream server package.

client/internal/logdog/butler/streamserver/npipe_windows.go

Index: client/internal/logdog/butler/streamserver/npipe_windows.go
diff --git a/client/internal/logdog/butler/streamserver/npipe_windows.go b/client/internal/logdog/butler/streamserver/npipe_windows.go
new file mode 100644
index 0000000000000000000000000000000000000000..135fbd27ba816672147b0a4a0ceb961aeff339a3
--- /dev/null
+++ b/client/internal/logdog/butler/streamserver/npipe_windows.go
@@ -0,0 +1,47 @@
+// Copyright 2015 The Chromium 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 streamserver
+
+import (
+	"fmt"
+	"net"
+
+	log "github.com/luci/luci-go/common/logging"
+	"golang.org/x/net/context"
+	"gopkg.in/natefinch/npipe.v2"
+)
+
+type namedPipeServer struct {
+	namedPipeServerBase
+
+	address string // The address of the Windows socket to create
+}
+
+// NewNamedPipeServer instantiates a new POSIX named pipe server instance.
+func NewNamedPipeServer(ctx context.Context, address string) StreamServer {
+	s := &namedPipeServer{
+		address: address,
+	}
+	ctx = log.SetField(ctx, "address", address)
+	s.initBase(ctx)
+	return s
+}
+
+func (s *namedPipeServer) String() string {
+	return fmt.Sprintf("NamedPipeServer[%s]", s.address)
+}
+
+// Wrapper around the "unix"-type Listener that cleans up the named pipe on
+// creation and 'Close()'
+type selfCleaningUNIXListener struct {
+	path     string
+	listener net.Listener
+}
+
+// OS-specific override to create a UNIX named socket listener
+func (s *namedPipeServer) createListener() (net.Listener, error) {
+	log.Debugf(s.ctx, "Creating Windows server socket Listener.")
+	return npipe.Listen(s.address)
+}