Butler stream servers can generate client address.

logdog/client/butler/streamserver/namedPipe_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 streamserver
 
 import (
         "net"
 
+        "github.com/luci/luci-go/common/errors"
         log "github.com/luci/luci-go/common/logging"
+
         "golang.org/x/net/context"
         npipe "gopkg.in/natefinch/npipe.v2"
 )
 
+// localNamedPipePrefix is the prefix that can be applied to a named pipe in
+// order to bind it exclusively to the local system.
+const localNamedPipePrefix = `\\.\pipe\`
+
+// maxWindowsNamedPipeLength is the maximum length of a Windows named pipe.
+const maxWindowsNamedPipeLength = 256
+
 // NewNamedPipeServer instantiates a new Windows named pipe server instance.
-func NewNamedPipeServer(ctx context.Context, address string) StreamServer {
-        ctx = log.SetField(ctx, "address", address)
+func NewNamedPipeServer(ctx context.Context, name string) (StreamServer, error) {
+        switch l := len(name); {
+        case l == 0:
+                return nil, errors.New("cannot have empty name")
+        case l > maxWindowsNamedPipeLength:
+                return nil, errors.Reason("name exceeds maximum length %(max)d").
+                        D("name", name).
+                        D("max", maxWindowsNamedPipeLength).
+                        Err()
+        }
+
+        name = localNamedPipePrefix + name

[nodir, 2017/03/06 22:29:44]

this may be more than maxWindowsNamedPipeLength?

[dnj, 2017/03/06 22:39:30]

This is fine - the name length is about the pipe name, not the full pipe path.

+        ctx = log.SetField(ctx, "name", name)
         return &listenerStreamServer{
                 Context: ctx,
+                address: "net.pipe:" + name,
                 gen: func() (net.Listener, error) {
                         log.Debugf(ctx, "Creating Windows server socket Listener.")
-                        return npipe.Listen(address)
+                        return npipe.Listen(name)
                 },
-        }
+        }, nil
 }