content::ResourceDispatcherHostImpl changes for stale-while-revalidate

content/browser/loader/async_revalidation_manager_unittest.cc

Index: content/browser/loader/async_revalidation_manager_unittest.cc
diff --git a/content/browser/loader/async_revalidation_manager_unittest.cc b/content/browser/loader/async_revalidation_manager_unittest.cc
new file mode 100644
index 0000000000000000000000000000000000000000..d0ec206130db8045c1d1a5ec69b216974c72fc77
--- /dev/null
+++ b/content/browser/loader/async_revalidation_manager_unittest.cc
@@ -0,0 +1,554 @@
+// Copyright 2015 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 "content/browser/loader/async_revalidation_manager.h"
+
+#include <deque>
+#include <string>
+#include <utility>
+
+#include "base/bind.h"
+#include "base/callback.h"
+#include "base/macros.h"
+#include "base/memory/shared_memory_handle.h"
+#include "base/pickle.h"
+#include "base/run_loop.h"
+#include "base/strings/string_util.h"
+#include "content/browser/child_process_security_policy_impl.h"
+#include "content/browser/loader/resource_dispatcher_host_impl.h"
+#include "content/browser/loader/resource_message_filter.h"
+#include "content/common/child_process_host_impl.h"
+#include "content/common/resource_messages.h"
+#include "content/public/browser/resource_context.h"
+#include "content/public/common/appcache_info.h"
+#include "content/public/common/process_type.h"
+#include "content/public/common/resource_type.h"
+#include "content/public/test/test_browser_context.h"
+#include "content/public/test/test_browser_thread_bundle.h"
+#include "ipc/ipc_param_traits.h"
+#include "net/base/load_flags.h"
+#include "net/base/network_delegate.h"
+#include "net/http/http_util.h"
+#include "net/url_request/url_request.h"
+#include "net/url_request/url_request_job.h"
+#include "net/url_request/url_request_job_factory.h"
+#include "net/url_request/url_request_test_job.h"
+#include "net/url_request/url_request_test_util.h"
+#include "testing/gtest/include/gtest/gtest.h"
+#include "ui/base/page_transition_types.h"
+#include "url/gurl.h"
+#include "url/url_constants.h"
+
+namespace content {
+
+namespace {
+
+// This class is a variation on URLRequestTestJob that
+// returns ERR_IO_PENDING before every read, not just the first one.
+class URLRequestTestDelayedCompletionJob : public net::URLRequestTestJob {
+ public:
+  URLRequestTestDelayedCompletionJob(net::URLRequest* request,
+                                     net::NetworkDelegate* network_delegate,
+                                     const std::string& response_headers,
+                                     const std::string& response_data)
+      : net::URLRequestTestJob(request,
+                               network_delegate,
+                               response_headers,
+                               response_data,
+                               false) {}
+
+ private:
+  bool NextReadAsync() override { return true; }
+};
+
+// A URLRequestJob implementation which sets the |async_revalidation_required|
+// flag on the HttpResponseInfo object to true if the request has the
+// LOAD_SUPPORT_ASYNC_REVALIDATION flag.
+class AsyncRevalidationRequiredURLRequestTestJob
+    : public net::URLRequestTestJob {
+ public:
+  AsyncRevalidationRequiredURLRequestTestJob(
+      net::URLRequest* request,
+      net::NetworkDelegate* network_delegate)
+      : URLRequestTestJob(request,
+                          network_delegate,
+                          net::URLRequestTestJob::test_headers(),
+                          std::string(),
+                          false) {}
+
+  void GetResponseInfo(net::HttpResponseInfo* info) override {
+    URLRequestTestJob::GetResponseInfo(info);
+    if (request()->load_flags() & net::LOAD_SUPPORT_ASYNC_REVALIDATION)
+      info->async_revalidation_required = true;
+  }
+};
+
+// A URLRequestJob implementation which serves a redirect and sets the
+// |async_revalidation_required| flag on the HttpResponseInfo object to true if
+// the request has the LOAD_SUPPORT_ASYNC_REVALIDATION flag.
+class RedirectAndRevalidateURLRequestTestJob : public net::URLRequestTestJob {
+ public:
+  RedirectAndRevalidateURLRequestTestJob(net::URLRequest* request,
+                                         net::NetworkDelegate* network_delegate)
+      : URLRequestTestJob(request,
+                          network_delegate,
+                          CreateRedirectHeaders(),
+                          std::string(),
+                          false) {}
+
+  void GetResponseInfo(net::HttpResponseInfo* info) override {
+    URLRequestTestJob::GetResponseInfo(info);
+    if (request()->load_flags() & net::LOAD_SUPPORT_ASYNC_REVALIDATION)
+      info->async_revalidation_required = true;
+  }
+
+ private:
+  static std::string CreateRedirectHeaders() {
+    static const char kRedirectHeaders[] =
+        "HTTP/1.1 302 MOVED\n"
+        "Location: http://example.com/async-revalidate/from-redirect\n"
+        "\n";
+    return std::string(kRedirectHeaders, arraysize(kRedirectHeaders) - 1);
+  }
+};
+
+class TestURLRequestJobFactory : public net::URLRequestJobFactory {
+ public:
+  TestURLRequestJobFactory() = default;
+
+  // Sets the contents of the response. |headers| should have "\n" as line
+  // breaks and end in "\n\n".
+  void SetResponse(const std::string& headers, const std::string& data) {
+    response_headers_ = headers;
+    response_data_ = data;
+  }
+
+  net::URLRequestJob* MaybeCreateJobWithProtocolHandler(
+      const std::string& scheme,
+      net::URLRequest* request,
+      net::NetworkDelegate* network_delegate) const override {
+    std::string path = request->url().path();
+    if (base::StartsWith(path, "/async-revalidate",
+                         base::CompareCase::SENSITIVE)) {
+      return new AsyncRevalidationRequiredURLRequestTestJob(request,
+                                                            network_delegate);
+    }
+    if (base::StartsWith(path, "/redirect", base::CompareCase::SENSITIVE)) {
+      return new RedirectAndRevalidateURLRequestTestJob(request,
+                                                        network_delegate);
+    }
+    return new URLRequestTestDelayedCompletionJob(
+        request, network_delegate, response_headers_, response_data_);
+  }
+
+  net::URLRequestJob* MaybeInterceptRedirect(
+      net::URLRequest* request,
+      net::NetworkDelegate* network_delegate,
+      const GURL& location) const override {
+    return nullptr;
+  }
+
+  net::URLRequestJob* MaybeInterceptResponse(
+      net::URLRequest* request,
+      net::NetworkDelegate* network_delegate) const override {
+    return nullptr;
+  }
+
+  bool IsHandledProtocol(const std::string& scheme) const override {
+    // If non-standard schemes need to be tested in future it will be
+    // necessary to call ChildProcessSecurityPolicyImpl::
+    // RegisterWebSafeScheme() for them.
+    return scheme == url::kHttpScheme || scheme == url::kHttpsScheme;
+  }
+
+  bool IsHandledURL(const GURL& url) const override {
+    return IsHandledProtocol(url.scheme());
+  }
+
+  bool IsSafeRedirectTarget(const GURL& location) const override {
+    return false;
+  }
+
+ private:
+  std::string response_headers_;
+  std::string response_data_;
+
+  DISALLOW_COPY_AND_ASSIGN(TestURLRequestJobFactory);
+};
+
+// On Windows, ResourceMsg_SetDataBuffer supplies a HANDLE which is not
+// automatically released.
+//
+// See ResourceDispatcher::ReleaseResourcesInDataMessage.
+//
+// TODO(ricea): Maybe share this implementation with
+// resource_dispatcher_host_unittest.cc.
+void ReleaseHandlesInMessage(const IPC::Message& message) {
+  if (message.type() == ResourceMsg_SetDataBuffer::ID) {
+    base::PickleIterator iter(message);
+    int request_id;
+    CHECK(iter.ReadInt(&request_id));
+    base::SharedMemoryHandle shm_handle;
+    if (IPC::ParamTraits<base::SharedMemoryHandle>::Read(&message, &iter,
+                                                         &shm_handle)) {
+      if (base::SharedMemory::IsHandleValid(shm_handle))
+        base::SharedMemory::CloseHandle(shm_handle);
+    }
+  }
+}
+
+// This filter just deletes any messages that are sent through it.
+class BlackholeFilter : public ResourceMessageFilter {
+ public:
+  explicit BlackholeFilter(ResourceContext* resource_context)
+      : ResourceMessageFilter(
+            ChildProcessHostImpl::GenerateChildProcessUniqueId(),
+            PROCESS_TYPE_RENDERER,
+            nullptr,
+            nullptr,
+            nullptr,
+            nullptr,
+            nullptr,
+            base::Bind(&BlackholeFilter::GetContexts, base::Unretained(this))),
+        resource_context_(resource_context) {
+    ChildProcessSecurityPolicyImpl::GetInstance()->Add(child_id());
+  }
+
+  bool Send(IPC::Message* msg) override {
+    scoped_ptr<IPC::Message> take_ownership(msg);
+    ReleaseHandlesInMessage(*msg);
+    return true;
+  }
+
+ private:
+  ~BlackholeFilter() override {
+    ChildProcessSecurityPolicyImpl::GetInstance()->Remove(child_id());
+  }
+
+  void GetContexts(ResourceType resource_type,
+                   int origin_pid,
+                   ResourceContext** resource_context,
+                   net::URLRequestContext** request_context) {
+    *resource_context = resource_context_;
+    *request_context = resource_context_->GetRequestContext();
+  }
+
+  ResourceContext* resource_context_;
+
+  DISALLOW_COPY_AND_ASSIGN(BlackholeFilter);
+};
+
+ResourceHostMsg_Request CreateResourceRequest(const char* method,
+                                              ResourceType type,
+                                              const GURL& url) {
+  ResourceHostMsg_Request request;
+  request.method = std::string(method);
+  request.url = url;
+  request.first_party_for_cookies = url;  // Bypass third-party cookie blocking.
+  request.referrer_policy = blink::WebReferrerPolicyDefault;
+  request.load_flags = 0;
+  request.origin_pid = 0;
+  request.resource_type = type;
+  request.request_context = 0;
+  request.appcache_host_id = kAppCacheNoHostId;
+  request.download_to_file = false;
+  request.should_reset_appcache = false;
+  request.is_main_frame = true;
+  request.parent_is_main_frame = false;
+  request.parent_render_frame_id = -1;
+  request.transition_type = ui::PAGE_TRANSITION_LINK;
+  request.allow_download = true;
+  return request;
+}
+
+class AsyncRevalidationManagerTest : public ::testing::Test {
+ protected:
+  AsyncRevalidationManagerTest(
+      scoped_ptr<net::TestNetworkDelegate> network_delegate)
+      : thread_bundle_(content::TestBrowserThreadBundle::IO_MAINLOOP),
+        network_delegate_(std::move(network_delegate)) {
+    browser_context_.reset(new TestBrowserContext());
+    BrowserContext::EnsureResourceContextInitialized(browser_context_.get());
+    base::RunLoop().RunUntilIdle();
+    ResourceContext* resource_context = browser_context_->GetResourceContext();
+    filter_ = new BlackholeFilter(resource_context);
+    net::URLRequestContext* request_context =
+        resource_context->GetRequestContext();
+    job_factory_.reset(new TestURLRequestJobFactory);
+    request_context->set_job_factory(job_factory_.get());
+    request_context->set_network_delegate(network_delegate_.get());
+    host_.EnableStaleWhileRevalidateForTesting();
+  }
+
+  AsyncRevalidationManagerTest()
+      : AsyncRevalidationManagerTest(
+            make_scoped_ptr(new net::TestNetworkDelegate)) {}
+
+  void TearDown() override {
+    host_.CancelRequestsForProcess(filter_->child_id());
+    host_.Shutdown();
+    host_.CancelRequestsForContext(browser_context_->GetResourceContext());
+    browser_context_.reset();
+    base::RunLoop().RunUntilIdle();
+  }
+
+  void SetResponse(const std::string& headers, const std::string& data) {
+    job_factory_->SetResponse(headers, data);
+  }
+
+  // Creates a request using the current test object as the filter and
+  // SubResource as the resource type.
+  void MakeTestRequest(int render_view_id, int request_id, const GURL& url) {
+    ResourceHostMsg_Request request =
+        CreateResourceRequest("GET", RESOURCE_TYPE_SUB_RESOURCE, url);
+    ResourceHostMsg_RequestResource msg(render_view_id, request_id, request);
+    host_.OnMessageReceived(msg, filter_.get());
+    base::RunLoop().RunUntilIdle();
+  }
+
+  void EnsureSchemeIsAllowed(const std::string& scheme) {
+    ChildProcessSecurityPolicyImpl* policy =
+        ChildProcessSecurityPolicyImpl::GetInstance();
+    if (!policy->IsWebSafeScheme(scheme))
+      policy->RegisterWebSafeScheme(scheme);
+  }
+
+  content::TestBrowserThreadBundle thread_bundle_;
+  scoped_ptr<TestBrowserContext> browser_context_;
+  scoped_ptr<TestURLRequestJobFactory> job_factory_;
+  scoped_refptr<BlackholeFilter> filter_;
+  scoped_ptr<net::TestNetworkDelegate> network_delegate_;
+  ResourceDispatcherHostImpl host_;
+};
+
+TEST_F(AsyncRevalidationManagerTest, SupportsAsyncRevalidation) {
+  SetResponse(net::URLRequestTestJob::test_headers(), "delay complete");
+  MakeTestRequest(0, 1, GURL("http://example.com/baz"));
+
+  net::URLRequest* url_request(
+      host_.GetURLRequest(GlobalRequestID(filter_->child_id(), 1)));
+  ASSERT_TRUE(url_request);
+
+  EXPECT_TRUE(url_request->load_flags() & net::LOAD_SUPPORT_ASYNC_REVALIDATION);
+}
+
+TEST_F(AsyncRevalidationManagerTest, AsyncRevalidationNotSupportedForPOST) {
+  SetResponse(net::URLRequestTestJob::test_headers(), "delay complete");
+  // Create POST request.
+  ResourceHostMsg_Request request = CreateResourceRequest(
+      "POST", RESOURCE_TYPE_SUB_RESOURCE, GURL("http://example.com/baz.php"));
+  ResourceHostMsg_RequestResource msg(0, 1, request);
+  host_.OnMessageReceived(msg, filter_.get());
+  base::RunLoop().RunUntilIdle();
+
+  net::URLRequest* url_request(
+      host_.GetURLRequest(GlobalRequestID(filter_->child_id(), 1)));
+  ASSERT_TRUE(url_request);
+
+  EXPECT_FALSE(url_request->load_flags() &
+               net::LOAD_SUPPORT_ASYNC_REVALIDATION);
+}
+
+TEST_F(AsyncRevalidationManagerTest,
+       AsyncRevalidationNotSupportedAfterRedirect) {
+  static const char kRedirectHeaders[] =
+      "HTTP/1.1 302 MOVED\n"
+      "Location: http://example.com/var\n"
+      "\n";
+  SetResponse(kRedirectHeaders, "");
+
+  MakeTestRequest(0, 1, GURL("http://example.com/baz"));
+
+  net::URLRequest* url_request(
+      host_.GetURLRequest(GlobalRequestID(filter_->child_id(), 1)));
+  ASSERT_TRUE(url_request);
+
+  EXPECT_FALSE(url_request->load_flags() &
+               net::LOAD_SUPPORT_ASYNC_REVALIDATION);
+}
+
+// A NetworkDelegate that records the URLRequests as they are created.
+class URLRequestRecordingNetworkDelegate : public net::TestNetworkDelegate {
+ public:
+  URLRequestRecordingNetworkDelegate() : requests_() {}
+
+  net::URLRequest* NextRequest() {
+    EXPECT_FALSE(requests_.empty());
+    if (requests_.empty())
+      return nullptr;
+    net::URLRequest* request = requests_.front();
+    EXPECT_TRUE(request);
+    requests_.pop_front();
+    return request;
+  }
+
+  bool NextRequestWasDestroyed() {
+    net::URLRequest* request = requests_.front();
+    requests_.pop_front();
+    return request == nullptr;
+  }
+
+  bool IsEmpty() const { return requests_.empty(); }
+
+  int OnBeforeURLRequest(net::URLRequest* request,
+                         const net::CompletionCallback& callback,
+                         GURL* new_url) override {
+    requests_.push_back(request);
+    return TestNetworkDelegate::OnBeforeURLRequest(request, callback, new_url);
+  }
+
+  void OnURLRequestDestroyed(net::URLRequest* request) override {
+    for (auto& recorded_request : requests_) {
+      if (recorded_request == request)
+        recorded_request = nullptr;
+    }
+    net::TestNetworkDelegate::OnURLRequestDestroyed(request);
+  }
+
+ private:
+  std::deque<net::URLRequest*> requests_;
+
+  DISALLOW_COPY_AND_ASSIGN(URLRequestRecordingNetworkDelegate);
+};
+
+class AsyncRevalidationManagerRecordingTest
+    : public AsyncRevalidationManagerTest {
+ public:
+  AsyncRevalidationManagerRecordingTest()
+      : AsyncRevalidationManagerTest(
+            make_scoped_ptr(new URLRequestRecordingNetworkDelegate)) {}
+
+  void TearDown() override {
+    EXPECT_TRUE(IsEmpty());
+    AsyncRevalidationManagerTest::TearDown();
+  }
+
+  URLRequestRecordingNetworkDelegate* recording_network_delegate() const {
+    return static_cast<URLRequestRecordingNetworkDelegate*>(
+        network_delegate_.get());
+  }
+
+  bool NextRequestWasDestroyed() {
+    return recording_network_delegate()->NextRequestWasDestroyed();
+  }
+
+  net::URLRequest* NextRequest() {
+    return recording_network_delegate()->NextRequest();
+  }
+
+  bool IsEmpty() const { return recording_network_delegate()->IsEmpty(); }
+};
+
+// Verify that an async revalidation is actually created when needed.
+TEST_F(AsyncRevalidationManagerRecordingTest, Issued) {
+  // Create the original request.
+  MakeTestRequest(0, 1, GURL("http://example.com/async-revalidate"));
+
+  net::URLRequest* initial_request = NextRequest();
+  ASSERT_TRUE(initial_request);
+  EXPECT_TRUE(initial_request->load_flags() &
+              net::LOAD_SUPPORT_ASYNC_REVALIDATION);
+
+  net::URLRequest* async_request = NextRequest();
+  ASSERT_TRUE(async_request);
+}
+
+// Verify the the URL of the async revalidation matches the original request.
+TEST_F(AsyncRevalidationManagerRecordingTest, URLMatches) {
+  // Create the original request.
+  MakeTestRequest(0, 1, GURL("http://example.com/async-revalidate/u"));
+
+  // Discard the original request.
+  NextRequest();
+
+  net::URLRequest* async_request = NextRequest();
+  ASSERT_TRUE(async_request);
+  EXPECT_EQ(GURL("http://example.com/async-revalidate/u"),
+            async_request->url());
+}
+
+TEST_F(AsyncRevalidationManagerRecordingTest,
+       AsyncRevalidationsDoNotSupportAsyncRevalidation) {
+  // Create the original request.
+  MakeTestRequest(0, 1, GURL("http://example.com/async-revalidate"));
+
+  // Discard the original request.
+  NextRequest();
+
+  // Get the async revalidation request.
+  net::URLRequest* async_request = NextRequest();
+  ASSERT_TRUE(async_request);
+  EXPECT_FALSE(async_request->load_flags() &
+               net::LOAD_SUPPORT_ASYNC_REVALIDATION);
+}
+
+TEST_F(AsyncRevalidationManagerRecordingTest, AsyncRevalidationsNotDuplicated) {
+  // Create the original request.
+  MakeTestRequest(0, 1, GURL("http://example.com/async-revalidate"));
+
+  // Discard the original request.
+  NextRequest();
+
+  // Get the async revalidation request.
+  net::URLRequest* async_request = NextRequest();
+  EXPECT_TRUE(async_request);
+
+  // Start a second request to the same URL.
+  MakeTestRequest(0, 2, GURL("http://example.com/async-revalidate"));
+
+  // Discard the second request.
+  NextRequest();
+
+  // There should not be another async revalidation request.
+  EXPECT_TRUE(IsEmpty());
+}
+
+// Async revalidation to different URLs should not be treated as duplicates.
+TEST_F(AsyncRevalidationManagerRecordingTest,
+       AsyncRevalidationsToSeparateURLsAreSeparate) {
+  // Create two requests to two URLs.
+  MakeTestRequest(0, 1, GURL("http://example.com/async-revalidate"));
+  MakeTestRequest(0, 2, GURL("http://example.com/async-revalidate2"));
+
+  net::URLRequest* initial_request = NextRequest();
+  ASSERT_TRUE(initial_request);
+  net::URLRequest* initial_async_revalidation = NextRequest();
+  ASSERT_TRUE(initial_async_revalidation);
+  net::URLRequest* second_request = NextRequest();
+  ASSERT_TRUE(second_request);
+  net::URLRequest* second_async_revalidation = NextRequest();
+  ASSERT_TRUE(second_async_revalidation);
+
+  EXPECT_EQ("http://example.com/async-revalidate",
+            initial_request->url().spec());
+  EXPECT_EQ("http://example.com/async-revalidate",
+            initial_async_revalidation->url().spec());
+  EXPECT_EQ("http://example.com/async-revalidate2",
+            second_request->url().spec());
+  EXPECT_EQ("http://example.com/async-revalidate2",
+            second_async_revalidation->url().spec());
+}
+
+// Nothing after the first redirect leg has stale-while-revalidate applied.
+// TODO(ricea): s-w-r should work with redirects. Change this test when it does.
+TEST_F(AsyncRevalidationManagerRecordingTest, NoSWRAfterFirstRedirectLeg) {
+  MakeTestRequest(0, 1, GURL("http://example.com/redirect"));
+
+  net::URLRequest* initial_request = NextRequest();
+  EXPECT_TRUE(initial_request);
+
+  EXPECT_FALSE(initial_request->load_flags() &
+               net::LOAD_SUPPORT_ASYNC_REVALIDATION);
+
+  // An async revalidation happens for the redirect. It has no body, so it has
+  // already completed.
+  EXPECT_TRUE(NextRequestWasDestroyed());
+
+  // But no others.
+  EXPECT_TRUE(IsEmpty());
+}
+
+}  // namespace
+
+}  // namespace content