Fuchsia: Partial implementation of dart:io sockets

runtime/tests/vm/dart/hello_fuchsia_test.dart

 // Copyright (c) 2016, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
-main() {
+import "dart:async";
+import "dart:io";
+
+testSimpleBind() async {
+  var s = await RawServerSocket.bind(InternetAddress.LOOPBACK_IP_V4, 0);
+  print("port = ${s.port}");
+  await s.close();
+}
+
+testSimpleConnect() async {
+  var server = await RawServerSocket.bind(InternetAddress.LOOPBACK_IP_V4, 0);
+  print("server port = ${server.port}");
+  server.listen((socket) {
+    print("listen socket port = ${socket.port}");
+    socket.close();
+  });
+  var socket = await RawSocket.connect("127.0.0.1", server.port);
+  print("socket port = ${socket.port}");
+  await server.close();
+  await socket.close();
+}
+
+testSimpleReadWrite({bool dropReads}) async {
+  // This test creates a server and a client connects. The client then
+  // writes and the server echos. When the server has finished its
+  // echo it half-closes. When the client gets the close event is
+  // closes fully.
+
+  const messageSize = 1000;
+  int serverReadCount = 0;
+  int clientReadCount = 0;
+
+  List<int> createTestData() {
+    return new List<int>.generate(messageSize, (index) => index & 0xff);
+  }
+
+  void verifyTestData(List<int> data) {
+    assert(messageSize == data.length);
+    List<int> expected = createTestData();
+    for (int i = 0; i < messageSize; i++) {
+      assert(expected[i] == data[i]);
+    }
+  }
+
+  var server = await RawServerSocket.bind(InternetAddress.LOOPBACK_IP_V4, 0);
+  server.listen((client) {
+    int bytesRead = 0;
+    int bytesWritten = 0;
+    bool closedEventReceived = false;
+    List<int> data = new List<int>(messageSize);
+    bool doneReading = false;
+
+    client.writeEventsEnabled = false;
+    client.listen((event) {
+      switch (event) {
+        case RawSocketEvent.READ:
+          if (doneReading) {
+            break;
+          }
+          if (dropReads) {
+            if (serverReadCount != 10) {
+              serverReadCount++;
+              break;
+            } else {
+              serverReadCount = 0;
+            }
+          }
+          print("client READ event bytesRead = $bytesRead");
+          assert(bytesWritten == 0);
+          assert(client.available() > 0);
+          var buffer = client.read(200);
+          print("client READ event: read ${buffer.length} more bytes");
+          data.setRange(bytesRead, bytesRead + buffer.length, buffer);
+          bytesRead += buffer.length;
+          if (bytesRead == data.length) {
+            verifyTestData(data);
+            print("client READ event. Done reading, enabling writes");
+            client.writeEventsEnabled = true;
+            doneReading = true;
+          }
+          break;
+        case RawSocketEvent.WRITE:
+          assert(!client.writeEventsEnabled);
+          bytesWritten += client.write(
+              data, bytesWritten, data.length - bytesWritten);
+          print("client WRITE event: $bytesWritten written");
+          if (bytesWritten < data.length) {
+            client.writeEventsEnabled = true;
+          }
+          if (bytesWritten == data.length) {
+            print("client WRITE event: done writing.");
+            client.shutdown(SocketDirection.SEND);
+          }
+          break;
+        case RawSocketEvent.READ_CLOSED:
+          print("client READ_CLOSED event");
+          server.close();
+          break;
+        case RawSocketEvent.CLOSED:
+          assert(!closedEventReceived);
+          print("client CLOSED event");
+          closedEventReceived = true;
+          break;
+        default: throw "Unexpected event $event";
+      }
+    },
+    onDone: () {assert(closedEventReceived);});
+  });
+
+  {
+    var completer = new Completer();
+    var socket = await RawSocket.connect("127.0.0.1", server.port);
+    int bytesRead = 0;
+    int bytesWritten = 0;
+    bool closedEventReceived = false;
+    List<int> data = createTestData();
+
+    socket.listen((event) {
+      switch (event) {
+        case RawSocketEvent.READ:
+          assert(socket.available() > 0);
+          if (dropReads) {
+            if (clientReadCount != 10) {
+              clientReadCount++;
+              break;
+            } else {
+              clientReadCount = 0;
+            }
+          }
+          print("server READ event: ${bytesRead} read");
+          var buffer = socket.read();
+          print("server READ event: read ${buffer.length} more bytes");
+          data.setRange(bytesRead, bytesRead + buffer.length, buffer);
+          bytesRead += buffer.length;
+          break;
+        case RawSocketEvent.WRITE:
+          assert(bytesRead == 0);
+          assert(!socket.writeEventsEnabled);
+          bytesWritten += socket.write(
+              data, bytesWritten, data.length - bytesWritten);
+          print("server WRITE event: ${bytesWritten} written");
+          if (bytesWritten < data.length) {
+            socket.writeEventsEnabled = true;
+          } else {
+            print("server WRITE event: done writing");
+            data = new List<int>(messageSize);
+          }
+          break;
+        case RawSocketEvent.READ_CLOSED:
+          print("server READ_CLOSED event");
+          verifyTestData(data);
+          socket.close();
+          break;
+        case RawSocketEvent.CLOSED:
+          assert(!closedEventReceived);
+          print("server CLOSED event");
+          closedEventReceived = true;
+          break;
+        default: throw "Unexpected event $event";
+      }
+    },
+    onDone: () {
+      assert(closedEventReceived);
+      completer.complete(null);
+    });
+
+    return completer.future;
+  }
+}
+
+Future testGoogleUrl(SecurityContext context, String outcome) async {
+  var client = new HttpClient(context: context);
+  // We need to use an external server that is backed by a
+  // built-in root certificate authority.
+  try {
+    // First, check if the lookup works.
+    await InternetAddress.lookup('www.google.com');
+    var request = await client.getUrl(Uri.parse('http://www.google.com'));
+    request.followRedirects = false;
+    var response = await request.close();
+    assert('pass' == outcome);
+    try { await response.drain(); } catch (e) {
+      print('drain failed: $e');
+    }
+  } catch (e) {
+    // Lookup failed or connection failed.  Don't report a failure.
+    print("SocketException: $e");
+  } finally {
+    client.close();
+  }
+}
+
+main() async {
   print("Hello, Fuchsia!");
-}
+
+  print("testSimpleBind");
+  await testSimpleBind();
+  print("testSimpleBind done");
+
+  print("testSimpleConnect");
+  await testSimpleConnect();
+  print("testSimpleConnect done");
+
+  // print("testSimpleReadWrite");
+  // await testSimpleReadWrite(dropReads: false);
+  // print("testSimpleReadWrite done");
+
+  // print("testGoogleUrl");
+  // await testGoogleUrl(null, 'pass');
+  // print("testGoogleUrl done");
+
+  print("Goodbyte, Fuchsia!");
+}