Add support for IPv6 (#653)
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 98d9d98..3b18785 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -6,6 +6,9 @@
makes it possible to safely share `Future`s and `Stream`s between tests and
their tear-downs.
+* Properly allocate ports when debugging Chrome and Dartium in an IPv6-only
+ environment.
+
## 0.12.22
* Add a `retry` option to `test()` and `group()` functions, as well
diff --git a/lib/src/util/io.dart b/lib/src/util/io.dart
index 95474f7..4820857 100644
--- a/lib/src/util/io.dart
+++ b/lib/src/util/io.dart
@@ -137,13 +137,27 @@
return value;
}
+/// Whether this computer supports binding to IPv6 addresses.
+var _maySupportIPv6 = true;
+
/// Returns a port that is probably, but not definitely, not in use.
///
/// This has a built-in race condition: another process may bind this port at
/// any time after this call has returned. If at all possible, callers should
/// use [getUnusedPort] instead.
Future<int> getUnsafeUnusedPort() async {
- var socket = await RawServerSocket.bind(InternetAddress.LOOPBACK_IP_V4, 0);
+ var socket;
+ if (_maySupportIPv6) {
+ try {
+ socket = await ServerSocket.bind(InternetAddress.LOOPBACK_IP_V6, 0,
+ v6Only: true);
+ } on SocketException {
+ _maySupportIPv6 = false;
+ }
+ }
+ if (!_maySupportIPv6) {
+ socket = await RawServerSocket.bind(InternetAddress.LOOPBACK_IP_V4, 0);
+ }
var port = socket.port;
await socket.close();
return port;
