| // Copyright 2014 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/third_party/quic/core/quic_write_blocked_list.h" |
| |
| #include "net/third_party/quic/platform/api/quic_test.h" |
| #include "net/third_party/quic/test_tools/quic_test_utils.h" |
| |
| using spdy::kV3HighestPriority; |
| using spdy::kV3LowestPriority; |
| |
| namespace quic { |
| namespace test { |
| namespace { |
| |
| class QuicWriteBlockedListTest : public QuicTest {}; |
| |
| TEST_F(QuicWriteBlockedListTest, PriorityOrder) { |
| QuicWriteBlockedList write_blocked_list; |
| |
| // Mark streams blocked in roughly reverse priority order, and |
| // verify that streams are sorted. |
| write_blocked_list.RegisterStream(40, false, kV3LowestPriority); |
| write_blocked_list.RegisterStream(23, false, kV3HighestPriority); |
| write_blocked_list.RegisterStream(17, false, kV3HighestPriority); |
| write_blocked_list.RegisterStream(1, true, kV3HighestPriority); |
| write_blocked_list.RegisterStream(3, true, kV3HighestPriority); |
| |
| write_blocked_list.AddStream(40); |
| EXPECT_TRUE(write_blocked_list.IsStreamBlocked(40)); |
| write_blocked_list.AddStream(23); |
| EXPECT_TRUE(write_blocked_list.IsStreamBlocked(23)); |
| write_blocked_list.AddStream(17); |
| EXPECT_TRUE(write_blocked_list.IsStreamBlocked(17)); |
| write_blocked_list.AddStream(3); |
| EXPECT_TRUE(write_blocked_list.IsStreamBlocked(3)); |
| write_blocked_list.AddStream(1); |
| EXPECT_TRUE(write_blocked_list.IsStreamBlocked(1)); |
| |
| EXPECT_EQ(5u, write_blocked_list.NumBlockedStreams()); |
| EXPECT_TRUE(write_blocked_list.HasWriteBlockedSpecialStream()); |
| EXPECT_EQ(2u, write_blocked_list.NumBlockedSpecialStreams()); |
| EXPECT_TRUE(write_blocked_list.HasWriteBlockedDataStreams()); |
| // The Crypto stream is highest priority. |
| EXPECT_EQ(1u, write_blocked_list.PopFront()); |
| EXPECT_EQ(1u, write_blocked_list.NumBlockedSpecialStreams()); |
| EXPECT_FALSE(write_blocked_list.IsStreamBlocked(1)); |
| // Followed by the Headers stream. |
| EXPECT_EQ(3u, write_blocked_list.PopFront()); |
| EXPECT_EQ(0u, write_blocked_list.NumBlockedSpecialStreams()); |
| EXPECT_FALSE(write_blocked_list.IsStreamBlocked(3)); |
| // Streams with same priority are popped in the order they were inserted. |
| EXPECT_EQ(23u, write_blocked_list.PopFront()); |
| EXPECT_FALSE(write_blocked_list.IsStreamBlocked(23)); |
| EXPECT_EQ(17u, write_blocked_list.PopFront()); |
| EXPECT_FALSE(write_blocked_list.IsStreamBlocked(17)); |
| // Low priority stream appears last. |
| EXPECT_EQ(40u, write_blocked_list.PopFront()); |
| EXPECT_FALSE(write_blocked_list.IsStreamBlocked(40)); |
| |
| EXPECT_EQ(0u, write_blocked_list.NumBlockedStreams()); |
| EXPECT_FALSE(write_blocked_list.HasWriteBlockedSpecialStream()); |
| EXPECT_FALSE(write_blocked_list.HasWriteBlockedDataStreams()); |
| } |
| |
| TEST_F(QuicWriteBlockedListTest, CryptoStream) { |
| QuicWriteBlockedList write_blocked_list; |
| write_blocked_list.RegisterStream(1, true, kV3HighestPriority); |
| write_blocked_list.AddStream(1); |
| |
| EXPECT_EQ(1u, write_blocked_list.NumBlockedStreams()); |
| EXPECT_TRUE(write_blocked_list.HasWriteBlockedSpecialStream()); |
| EXPECT_EQ(1u, write_blocked_list.PopFront()); |
| EXPECT_EQ(0u, write_blocked_list.NumBlockedStreams()); |
| EXPECT_FALSE(write_blocked_list.HasWriteBlockedSpecialStream()); |
| } |
| |
| TEST_F(QuicWriteBlockedListTest, HeadersStream) { |
| QuicWriteBlockedList write_blocked_list; |
| write_blocked_list.RegisterStream(3, true, kV3HighestPriority); |
| write_blocked_list.AddStream(3); |
| |
| EXPECT_EQ(1u, write_blocked_list.NumBlockedStreams()); |
| EXPECT_TRUE(write_blocked_list.HasWriteBlockedSpecialStream()); |
| EXPECT_EQ(3u, write_blocked_list.PopFront()); |
| EXPECT_EQ(0u, write_blocked_list.NumBlockedStreams()); |
| EXPECT_FALSE(write_blocked_list.HasWriteBlockedSpecialStream()); |
| } |
| |
| TEST_F(QuicWriteBlockedListTest, VerifyHeadersStream) { |
| QuicWriteBlockedList write_blocked_list; |
| write_blocked_list.RegisterStream(5, false, kV3HighestPriority); |
| write_blocked_list.RegisterStream(3, true, kV3HighestPriority); |
| write_blocked_list.AddStream(5); |
| write_blocked_list.AddStream(3); |
| |
| EXPECT_EQ(2u, write_blocked_list.NumBlockedStreams()); |
| EXPECT_TRUE(write_blocked_list.HasWriteBlockedSpecialStream()); |
| EXPECT_TRUE(write_blocked_list.HasWriteBlockedDataStreams()); |
| // In newer QUIC versions, there is a headers stream which is |
| // higher priority than data streams. |
| EXPECT_EQ(3u, write_blocked_list.PopFront()); |
| EXPECT_EQ(5u, write_blocked_list.PopFront()); |
| EXPECT_EQ(0u, write_blocked_list.NumBlockedStreams()); |
| EXPECT_FALSE(write_blocked_list.HasWriteBlockedSpecialStream()); |
| EXPECT_FALSE(write_blocked_list.HasWriteBlockedDataStreams()); |
| } |
| |
| TEST_F(QuicWriteBlockedListTest, NoDuplicateEntries) { |
| // Test that QuicWriteBlockedList doesn't allow duplicate entries. |
| QuicWriteBlockedList write_blocked_list; |
| |
| // Try to add a stream to the write blocked list multiple times at the same |
| // priority. |
| const QuicStreamId kBlockedId = 3 + 2; |
| write_blocked_list.RegisterStream(kBlockedId, false, kV3HighestPriority); |
| write_blocked_list.AddStream(kBlockedId); |
| write_blocked_list.AddStream(kBlockedId); |
| write_blocked_list.AddStream(kBlockedId); |
| |
| // This should only result in one blocked stream being added. |
| EXPECT_EQ(1u, write_blocked_list.NumBlockedStreams()); |
| EXPECT_TRUE(write_blocked_list.HasWriteBlockedDataStreams()); |
| |
| // There should only be one stream to pop off the front. |
| EXPECT_EQ(kBlockedId, write_blocked_list.PopFront()); |
| EXPECT_EQ(0u, write_blocked_list.NumBlockedStreams()); |
| EXPECT_FALSE(write_blocked_list.HasWriteBlockedDataStreams()); |
| } |
| |
| TEST_F(QuicWriteBlockedListTest, BatchingWrites) { |
| QuicWriteBlockedList write_blocked_list; |
| |
| const QuicStreamId id1 = 3 + 2; |
| const QuicStreamId id2 = id1 + 2; |
| const QuicStreamId id3 = id2 + 2; |
| write_blocked_list.RegisterStream(id1, false, kV3LowestPriority); |
| write_blocked_list.RegisterStream(id2, false, kV3LowestPriority); |
| write_blocked_list.RegisterStream(id3, false, kV3HighestPriority); |
| |
| write_blocked_list.AddStream(id1); |
| write_blocked_list.AddStream(id2); |
| EXPECT_EQ(2u, write_blocked_list.NumBlockedStreams()); |
| |
| // The first stream we push back should stay at the front until 16k is |
| // written. |
| EXPECT_EQ(id1, write_blocked_list.PopFront()); |
| write_blocked_list.UpdateBytesForStream(id1, 15999); |
| write_blocked_list.AddStream(id1); |
| EXPECT_EQ(2u, write_blocked_list.NumBlockedStreams()); |
| EXPECT_EQ(id1, write_blocked_list.PopFront()); |
| |
| // Once 16k is written the first stream will yield to the next. |
| write_blocked_list.UpdateBytesForStream(id1, 1); |
| write_blocked_list.AddStream(id1); |
| EXPECT_EQ(2u, write_blocked_list.NumBlockedStreams()); |
| EXPECT_EQ(id2, write_blocked_list.PopFront()); |
| |
| // Set the new stream to have written all but one byte. |
| write_blocked_list.UpdateBytesForStream(id2, 15999); |
| write_blocked_list.AddStream(id2); |
| EXPECT_EQ(2u, write_blocked_list.NumBlockedStreams()); |
| |
| // Ensure higher priority streams are popped first. |
| write_blocked_list.AddStream(id3); |
| EXPECT_EQ(id3, write_blocked_list.PopFront()); |
| |
| // Higher priority streams will always be popped first, even if using their |
| // byte quota |
| write_blocked_list.UpdateBytesForStream(id3, 20000); |
| write_blocked_list.AddStream(id3); |
| EXPECT_EQ(id3, write_blocked_list.PopFront()); |
| |
| // Once the higher priority stream is out of the way, id2 will resume its 16k |
| // write, with only 1 byte remaining of its guaranteed write allocation. |
| EXPECT_EQ(id2, write_blocked_list.PopFront()); |
| write_blocked_list.UpdateBytesForStream(id2, 1); |
| write_blocked_list.AddStream(id2); |
| EXPECT_EQ(2u, write_blocked_list.NumBlockedStreams()); |
| EXPECT_EQ(id1, write_blocked_list.PopFront()); |
| } |
| |
| TEST_F(QuicWriteBlockedListTest, Ceding) { |
| QuicWriteBlockedList write_blocked_list; |
| |
| write_blocked_list.RegisterStream(15, false, kV3HighestPriority); |
| write_blocked_list.RegisterStream(16, false, kV3HighestPriority); |
| write_blocked_list.RegisterStream(5, false, 5); |
| write_blocked_list.RegisterStream(4, false, 5); |
| write_blocked_list.RegisterStream(7, false, 7); |
| write_blocked_list.RegisterStream(1, true, kV3HighestPriority); |
| write_blocked_list.RegisterStream(3, true, kV3HighestPriority); |
| |
| // When nothing is on the list, nothing yields. |
| EXPECT_FALSE(write_blocked_list.ShouldYield(5)); |
| |
| write_blocked_list.AddStream(5); |
| // 5 should not yield to itself. |
| EXPECT_FALSE(write_blocked_list.ShouldYield(5)); |
| // 4 and 7 are equal or lower priority and should yield to 5. |
| EXPECT_TRUE(write_blocked_list.ShouldYield(4)); |
| EXPECT_TRUE(write_blocked_list.ShouldYield(7)); |
| // 15, headers and crypto should preempt 5. |
| EXPECT_FALSE(write_blocked_list.ShouldYield(15)); |
| EXPECT_FALSE(write_blocked_list.ShouldYield(3)); |
| EXPECT_FALSE(write_blocked_list.ShouldYield(1)); |
| |
| // Block a high priority stream. |
| write_blocked_list.AddStream(15); |
| // 16 should yield (same priority) but headers and crypto will still not. |
| EXPECT_TRUE(write_blocked_list.ShouldYield(16)); |
| EXPECT_FALSE(write_blocked_list.ShouldYield(3)); |
| EXPECT_FALSE(write_blocked_list.ShouldYield(1)); |
| |
| // Block the headers stream. All streams but crypto and headers should yield. |
| write_blocked_list.AddStream(3); |
| EXPECT_TRUE(write_blocked_list.ShouldYield(16)); |
| EXPECT_TRUE(write_blocked_list.ShouldYield(15)); |
| EXPECT_FALSE(write_blocked_list.ShouldYield(3)); |
| EXPECT_FALSE(write_blocked_list.ShouldYield(1)); |
| |
| // Block the crypto stream. All streams but crypto should yield. |
| write_blocked_list.AddStream(1); |
| EXPECT_TRUE(write_blocked_list.ShouldYield(16)); |
| EXPECT_TRUE(write_blocked_list.ShouldYield(15)); |
| EXPECT_TRUE(write_blocked_list.ShouldYield(3)); |
| EXPECT_FALSE(write_blocked_list.ShouldYield(1)); |
| } |
| |
| } // namespace |
| } // namespace test |
| } // namespace quic |