Use sockets with unread data if they've never been used before.

net/socket/ssl_client_socket_unittest.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "net/socket/ssl_client_socket.h"
 
 #include "base/callback_helpers.h"
 #include "base/memory/ref_counted.h"
 #include "net/base/address_list.h"
 #include "net/base/io_buffer.h"
@@ skipping 2040 matching lines @@
   EXPECT_TRUE(sock->IsConnected());
   log.GetEntries(&entries);
   EXPECT_TRUE(LogContainsSSLConnectEndEvent(entries, -1));
 
   EXPECT_FALSE(sock->signed_cert_timestamps_received_);
 
   sock->Disconnect();
   EXPECT_FALSE(sock->IsConnected());
 }
 
+// Tests that IsConnectedAndIdle and WasEverUsed behave as expected.
+TEST_F(SSLClientSocketTest, ReuseStates) {
+  SpawnedTestServer test_server(SpawnedTestServer::TYPE_HTTPS,
+                                SpawnedTestServer::kLocalhost,
+                                base::FilePath());
+  ASSERT_TRUE(test_server.Start());
+
+  AddressList addr;
+  ASSERT_TRUE(test_server.GetAddressList(&addr));
+
+  TestCompletionCallback callback;
+  scoped_ptr<StreamSocket> transport(
+      new TCPClientSocket(addr, NULL, NetLog::Source()));
+  int rv = transport->Connect(callback.callback());
+  if (rv == ERR_IO_PENDING)
+    rv = callback.WaitForResult();
+  EXPECT_EQ(OK, rv);
+
+  scoped_ptr<SSLClientSocket> sock(CreateSSLClientSocket(
+      transport.Pass(), test_server.host_port_pair(), kDefaultSSLConfig));
+
+  rv = sock->Connect(callback.callback());
+  if (rv == ERR_IO_PENDING)
+    rv = callback.WaitForResult();
+  EXPECT_EQ(OK, rv);
+
+  // The socket was just connected. It should be idle because it is speaking
+  // HTTP. Although the transport has been used for the handshake, WasEverUsed()
+  // returns false.
+  EXPECT_TRUE(sock->IsConnected());
+  EXPECT_TRUE(sock->IsConnectedAndIdle());
+  EXPECT_FALSE(sock->WasEverUsed());
+
+  const char request_text[] = "GET / HTTP/1.0\r\n\r\n";

[mmenke, 2014/03/18 15:16:55]

nit kRequestText?

[davidben, 2014/03/25 19:50:18]

Done. (That was from copy-and-paste actually.)

+  scoped_refptr<IOBuffer> request_buffer(
+      new IOBuffer(arraysize(request_text) - 1));

[mmenke, 2014/03/18 15:16:55]

Suggest you have const with the value of "arraysize(request_text) - 1".  Just
seems weird to repeat it everywhere.

[davidben, 2014/03/25 19:50:18]

Done.

+  memcpy(request_buffer->data(), request_text, arraysize(request_text) - 1);
+
+  rv = sock->Write(
+      request_buffer.get(), arraysize(request_text) - 1, callback.callback());
+  EXPECT_TRUE(rv >= 0 || rv == ERR_IO_PENDING);
+
+  if (rv == ERR_IO_PENDING)
+    rv = callback.WaitForResult();
+  EXPECT_EQ(static_cast<int>(arraysize(request_text) - 1), rv);
+
+  // The socket has now been used.
+  EXPECT_TRUE(sock->WasEverUsed());
+
+  // TODO(davidben): Read one byte to ensure the test server has responded and
+  // then assert IsConnectedAndIdle is false. This currently doesn't work
+  // because neither SSLClientSocketNSS nor SSLClientSocketOpenSSL check their
+  // SSL implementation's internal buffers. Either call PR_Available and

[mmenke, 2014/03/18 15:16:55]

I'm assuming this means the "Idle" part wouldn't work?  (I'm assuming reading 1
byte works fine).

[davidben, 2014/03/25 19:50:18]

Yeah, IsConnectedAndIdle() will still be true because the remainder of the
unread data will get into NSS and OpenSSL's internal buffers.
IsConnectedAndIdle() fails to check that.

+  // SSL_pending, although the former isn't actually implemented or perhaps
+  // attempt to read one byte extra.
+}
+
 }  // namespace net