From 47c887338f10cf05484e695cbf55c4fd0fd06bce Mon Sep 17 00:00:00 2001
From: Jonathan Gillham <jonathan.gillham@gamil.com>
Date: Fri, 29 Aug 2014 09:44:41 +0100
Subject: [PATCH] Made App Engine runtime compatible.

---
 certgen.go  |  2 +-
 net.go      | 18 ++++++++++++++++++
 net_noop.go | 19 +++++++++++++++++++
 3 files changed, 38 insertions(+), 1 deletion(-)
 create mode 100644 net.go
 create mode 100644 net_noop.go

diff --git a/certgen.go b/certgen.go
index a410bf4..76dc5e5 100644
--- a/certgen.go
+++ b/certgen.go
@@ -77,7 +77,7 @@ func NewTLSCertPair(organization string, validUntil time.Time, extraHosts []stri
 		"localhost": true,
 	}
 
-	addrs, err := net.InterfaceAddrs()
+	addrs, err := interfaceAddrs()
 	if err != nil {
 		return nil, nil, err
 	}
diff --git a/net.go b/net.go
new file mode 100644
index 0000000..07d1606
--- /dev/null
+++ b/net.go
@@ -0,0 +1,18 @@
+// Copyright (c) 2013-2014 Conformal Systems LLC.
+// Use of this source code is governed by an ISC
+// license that can be found in the LICENSE file.
+
+// +build !appengine
+
+package btcutil
+
+import (
+	"net"
+)
+
+// interfaceAddrs returns a list of the system's network interface addresses.
+// It is wrapped here so that we can substitute it for other functions when
+// building for systems that do not allow access to net.InterfaceAddrs().
+func interfaceAddrs() ([]net.Addr, error) {
+	return net.InterfaceAddrs()
+}
diff --git a/net_noop.go b/net_noop.go
new file mode 100644
index 0000000..3eeffda
--- /dev/null
+++ b/net_noop.go
@@ -0,0 +1,19 @@
+// Copyright (c) 2013-2014 Conformal Systems LLC.
+// Use of this source code is governed by an ISC
+// license that can be found in the LICENSE file.
+
+// +build appengine
+
+package btcutil
+
+import (
+	"net"
+)
+
+// interfaceAddrs returns a list of the system's network interface addresses.
+// It is wrapped here so that we can substitute it for a no-op function that
+// returns an empty slice of net.Addr when building for systems that do not
+// allow access to net.InterfaceAddrs().
+func interfaceAddrs() ([]net.Addr, error) {
+	return []net.Addr{}, nil
+}