Made App Engine runtime compatible.

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
 	}

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()
+}

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
+}