Use FrameTreeNode ID as frameId in extension APIs

extensions/browser/extension_api_frame_id_map_unittest.cc

Index: extensions/browser/extension_api_frame_id_map_unittest.cc
diff --git a/extensions/browser/extension_api_frame_id_map_unittest.cc b/extensions/browser/extension_api_frame_id_map_unittest.cc
new file mode 100644
index 0000000000000000000000000000000000000000..46bcd25e4353354874a84e94b201c4649da7d366
--- /dev/null
+++ b/extensions/browser/extension_api_frame_id_map_unittest.cc
@@ -0,0 +1,205 @@
+// 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 "base/bind.h"
+#include "base/run_loop.h"
+#include "content/public/test/test_browser_thread_bundle.h"
+#include "extensions/browser/extension_api_frame_id_map.h"
+#include "testing/gtest/include/gtest/gtest.h"
+
+using FrameIdCallback = extensions::ExtensionApiFrameIdMap::FrameIdCallback;
+
+namespace extensions {
+
+namespace {
+
+int ToTestFrameId(int render_process_id, int frame_routing_id) {
+  if (render_process_id == -1 && frame_routing_id == -1)
+    return ExtensionApiFrameIdMap::kInvalidFrameId;
+  // Return a deterministic value (yet different from the input) for testing.
+  // To make debugging easier: Ending with 0 = frame ID.
+  return render_process_id * 1000 + frame_routing_id * 10;
+}
+
+int ToTestParentFrameId(int render_process_id, int frame_routing_id) {
+  if (render_process_id == -1 && frame_routing_id == -1)
+    return ExtensionApiFrameIdMap::kInvalidFrameId;
+  // Return a deterministic value (yet different from the input) for testing.
+  // To make debugging easier: Ending with 7 = parent frame ID.
+  return render_process_id * 1000 + frame_routing_id * 10 + 7;
+}
+
+class TestExtensionApiFrameIdMap : public ExtensionApiFrameIdMap {
+ public:
+  int GetInternalSize() { return frame_id_map_.size(); }
+  int GetInternalCallbackCount() {
+    int count = 0;
+    for (auto& it : callbacks_map_)
+      count += it.second.callbacks.size();
+    return count;
+  }
+
+  // These indirections are necessary because we cannot mock RenderFrameHost
+  // in unit tests :(

[nasko, 2016/01/05 00:39:58]

You technically can. Using TestRenderFrameHost and the
RenderViewHostTestHarness. I would leave this for another patch though, this one
has already seen enough churn.

[robwu, 2016/01/05 10:59:03]

Those are not in the public part of content/, including them would violate the
-content/ rule of extensions/DEPS.

[nasko, 2016/01/06 17:19:38]

The harness is public: content/public/test/test_renderer_host.h. It is used from
outside of content/.

[robwu, 2016/01/06 17:48:59]

Thanks for this pointer, that could work indeed. I've added a TODO instead of
this comment.

+  void SetInternalFrameId(int render_process_id, int frame_routing_id) {
+    CacheFrameId(RenderFrameIdKey(render_process_id, frame_routing_id));
+  }
+  void RemoveInternalFrameId(int render_process_id, int frame_routing_id) {
+    RemoveFrameId(RenderFrameIdKey(render_process_id, frame_routing_id));
+  }
+
+ private:
+  // ExtensionApiFrameIdMap:
+  CachedFrameIdPair KeyToValue(const RenderFrameIdKey& key) const override {
+    return CachedFrameIdPair(
+        ToTestFrameId(key.render_process_id, key.frame_routing_id),
+        ToTestParentFrameId(key.render_process_id, key.frame_routing_id));
+  }
+};
+
+class ExtensionApiFrameIdMapTest : public testing::Test {
+ public:
+  ExtensionApiFrameIdMapTest()
+      : thread_bundle_(content::TestBrowserThreadBundle::IO_MAINLOOP) {}
+
+  FrameIdCallback CreateCallback(int render_process_id,
+                                 int frame_routing_id,
+                                 const std::string& callback_name_for_testing) {
+    return base::Bind(&ExtensionApiFrameIdMapTest::OnCalledCallback,
+                      base::Unretained(this), render_process_id,
+                      frame_routing_id, callback_name_for_testing);
+  }
+
+  void OnCalledCallback(int render_process_id,
+                        int frame_routing_id,
+                        const std::string& callback_name_for_testing,
+                        int extension_api_frame_id,
+                        int extension_api_parent_frame_id) {
+    results_.push_back(callback_name_for_testing);
+
+    // If this fails, then the mapping is completely wrong.
+    EXPECT_EQ(ToTestFrameId(render_process_id, frame_routing_id),
+              extension_api_frame_id);
+    EXPECT_EQ(ToTestParentFrameId(render_process_id, frame_routing_id),
+              extension_api_parent_frame_id);
+  }
+
+  const std::vector<std::string>& results() { return results_; }
+  void ClearResults() { results_.clear(); }
+
+ private:
+  content::TestBrowserThreadBundle thread_bundle_;
+  // Used to verify the order of callbacks.
+  std::vector<std::string> results_;
+
+  DISALLOW_COPY_AND_ASSIGN(ExtensionApiFrameIdMapTest);
+};
+
+}  // namespace
+
+TEST_F(ExtensionApiFrameIdMapTest, GetFrameIdOnIO) {
+  TestExtensionApiFrameIdMap map;
+  EXPECT_EQ(0, map.GetInternalSize());
+
+  // Two identical calls, should be processed at the next message loop.
+  map.GetFrameIdOnIO(1, 2, CreateCallback(1, 2, "first"));
+  EXPECT_EQ(1, map.GetInternalCallbackCount());
+  EXPECT_EQ(0, map.GetInternalSize());
+
+  map.GetFrameIdOnIO(1, 2, CreateCallback(1, 2, "first again"));
+  EXPECT_EQ(2, map.GetInternalCallbackCount());
+  EXPECT_EQ(0, map.GetInternalSize());
+
+  // First get the frame ID on IO (queued on message loop), then set it on UI.
+  // No callbacks should be invoked because the IO thread cannot know that the
+  // frame ID was set on the UI thread.
+  map.GetFrameIdOnIO(2, 1, CreateCallback(2, 1, "something else"));
+  EXPECT_EQ(3, map.GetInternalCallbackCount());
+  EXPECT_EQ(0, map.GetInternalSize());
+
+  map.SetInternalFrameId(2, 1);
+  EXPECT_EQ(1, map.GetInternalSize());
+  EXPECT_EQ(0U, results().size());
+
+  // Run some self-contained test. They should not affect the above callbacks.
+  {
+    // First set the frame ID on UI, then get it on IO. Callback should
+    // immediately be invoked.
+    map.SetInternalFrameId(3, 1);
+    EXPECT_EQ(2, map.GetInternalSize());
+
+    map.GetFrameIdOnIO(3, 1, CreateCallback(3, 1, "the only result"));
+    EXPECT_EQ(3, map.GetInternalCallbackCount());  // No change.
+    EXPECT_EQ(2, map.GetInternalSize());           // +1
+    ASSERT_EQ(1U, results().size());               // +1
+    EXPECT_EQ("the only result", results()[0]);
+    ClearResults();
+  }
+
+  {
+    // Request the frame ID on IO, set the frame ID (in reality, set on the UI),
+    // and request another frame ID. The last query should cause both callbacks
+    // to run because the frame ID is known at the time of the call.
+    map.GetFrameIdOnIO(7, 2, CreateCallback(7, 2, "queued"));
+    EXPECT_EQ(4, map.GetInternalCallbackCount());  // +1
+
+    map.SetInternalFrameId(7, 2);
+    EXPECT_EQ(3, map.GetInternalSize());           // +1
+
+    map.GetFrameIdOnIO(7, 2, CreateCallback(7, 2, "not queued"));
+    EXPECT_EQ(3, map.GetInternalCallbackCount());  // -1 (first callback ran).
+    EXPECT_EQ(3, map.GetInternalSize());           // No change.
+    ASSERT_EQ(2U, results().size());               // +2 (both callbacks ran).
+    EXPECT_EQ("queued", results()[0]);
+    EXPECT_EQ("not queued", results()[1]);
+    ClearResults();
+  }
+
+  // A call identical to the very first call.
+  map.GetFrameIdOnIO(1, 2, CreateCallback(1, 2, "same as first"));
+  EXPECT_EQ(4, map.GetInternalCallbackCount());
+  EXPECT_EQ(3, map.GetInternalSize());
+
+  // Trigger the queued callbacks.
+  base::RunLoop().RunUntilIdle();
+  EXPECT_EQ(0, map.GetInternalCallbackCount());   // -4 (no queued callbacks).
+
+  EXPECT_EQ(4, map.GetInternalSize());            // +1 (1 new cached frame ID).
+  ASSERT_EQ(4U, results().size());                // +4 (callbacks ran).
+
+  // PostTasks are processed in order, so the very first callbacks should be
+  // processed. As soon as the first callback is available, all of its callbacks
+  // should be run (no deferrals!).
+  EXPECT_EQ("first", results()[0]);
+  EXPECT_EQ("first again", results()[1]);
+  EXPECT_EQ("same as first", results()[2]);
+  // This was queued after "first again", but has a different frame ID, so it
+  // is received after "same as first".
+  EXPECT_EQ("something else", results()[3]);
+  ClearResults();
+
+  // Request the frame ID for input that was already looked up. Should complete
+  // synchronously.
+  map.GetFrameIdOnIO(1, 2, CreateCallback(1, 2, "first and cached"));
+  EXPECT_EQ(0, map.GetInternalCallbackCount());  // No change.
+  EXPECT_EQ(4, map.GetInternalSize());           // No change.
+  ASSERT_EQ(1U, results().size());               // +1 (synchronous callback).
+  EXPECT_EQ("first and cached", results()[0]);
+  ClearResults();
+
+  // Trigger frame removal and look up frame ID. The frame ID should no longer
+  // be available. and GetFrameIdOnIO() should require a thread hop.
+  map.RemoveInternalFrameId(1, 2);
+  EXPECT_EQ(3, map.GetInternalSize());           // -1
+  map.GetFrameIdOnIO(1, 2, CreateCallback(1, 2, "first was removed"));
+  EXPECT_EQ(1, map.GetInternalCallbackCount());  // +1
+  ASSERT_EQ(0U, results().size());               // No change (queued callback).
+  base::RunLoop().RunUntilIdle();
+  EXPECT_EQ(0, map.GetInternalCallbackCount());  // -1 (callback not in queue).
+  EXPECT_EQ(4, map.GetInternalSize());           // +1 (cached frame ID).
+  ASSERT_EQ(1U, results().size());               // +1 (callback ran).
+  EXPECT_EQ("first was removed", results()[0]);
+}
+
+}  // namespace extensions