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// 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/quic/core/quic_write_blocked_list.h"
#include "net/quic/platform/api/quic_test.h"
#include "net/quic/test_tools/quic_test_utils.h"
using net::kV3LowestPriority;
using net::kV3HighestPriority;
namespace net {
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, kV3LowestPriority);
write_blocked_list.RegisterStream(23, kV3HighestPriority);
write_blocked_list.RegisterStream(17, kV3HighestPriority);
write_blocked_list.RegisterStream(kHeadersStreamId, kV3HighestPriority);
write_blocked_list.RegisterStream(kCryptoStreamId, 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(kHeadersStreamId);
EXPECT_TRUE(write_blocked_list.IsStreamBlocked(kHeadersStreamId));
write_blocked_list.AddStream(kCryptoStreamId);
EXPECT_TRUE(write_blocked_list.IsStreamBlocked(kCryptoStreamId));
EXPECT_EQ(5u, write_blocked_list.NumBlockedStreams());
EXPECT_TRUE(write_blocked_list.HasWriteBlockedCryptoOrHeadersStream());
EXPECT_TRUE(write_blocked_list.HasWriteBlockedDataStreams());
// The Crypto stream is highest priority.
EXPECT_EQ(kCryptoStreamId, write_blocked_list.PopFront());
EXPECT_FALSE(write_blocked_list.IsStreamBlocked(kCryptoStreamId));
// Followed by the Headers stream.
EXPECT_EQ(kHeadersStreamId, write_blocked_list.PopFront());
EXPECT_FALSE(write_blocked_list.IsStreamBlocked(kHeadersStreamId));
// 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.HasWriteBlockedCryptoOrHeadersStream());
EXPECT_FALSE(write_blocked_list.HasWriteBlockedDataStreams());
}
TEST_F(QuicWriteBlockedListTest, CryptoStream) {
QuicWriteBlockedList write_blocked_list;
write_blocked_list.RegisterStream(kCryptoStreamId, kV3HighestPriority);
write_blocked_list.AddStream(kCryptoStreamId);
EXPECT_EQ(1u, write_blocked_list.NumBlockedStreams());
EXPECT_TRUE(write_blocked_list.HasWriteBlockedCryptoOrHeadersStream());
EXPECT_EQ(kCryptoStreamId, write_blocked_list.PopFront());
EXPECT_EQ(0u, write_blocked_list.NumBlockedStreams());
EXPECT_FALSE(write_blocked_list.HasWriteBlockedCryptoOrHeadersStream());
}
TEST_F(QuicWriteBlockedListTest, HeadersStream) {
QuicWriteBlockedList write_blocked_list;
write_blocked_list.RegisterStream(kHeadersStreamId, kV3HighestPriority);
write_blocked_list.AddStream(kHeadersStreamId);
EXPECT_EQ(1u, write_blocked_list.NumBlockedStreams());
EXPECT_TRUE(write_blocked_list.HasWriteBlockedCryptoOrHeadersStream());
EXPECT_EQ(kHeadersStreamId, write_blocked_list.PopFront());
EXPECT_EQ(0u, write_blocked_list.NumBlockedStreams());
EXPECT_FALSE(write_blocked_list.HasWriteBlockedCryptoOrHeadersStream());
}
TEST_F(QuicWriteBlockedListTest, VerifyHeadersStream) {
QuicWriteBlockedList write_blocked_list;
write_blocked_list.RegisterStream(5, kV3HighestPriority);
write_blocked_list.RegisterStream(kHeadersStreamId, kV3HighestPriority);
write_blocked_list.AddStream(5);
write_blocked_list.AddStream(kHeadersStreamId);
EXPECT_EQ(2u, write_blocked_list.NumBlockedStreams());
EXPECT_TRUE(write_blocked_list.HasWriteBlockedCryptoOrHeadersStream());
EXPECT_TRUE(write_blocked_list.HasWriteBlockedDataStreams());
// In newer QUIC versions, there is a headers stream which is
// higher priority than data streams.
EXPECT_EQ(kHeadersStreamId, write_blocked_list.PopFront());
EXPECT_EQ(5u, write_blocked_list.PopFront());
EXPECT_EQ(0u, write_blocked_list.NumBlockedStreams());
EXPECT_FALSE(write_blocked_list.HasWriteBlockedCryptoOrHeadersStream());
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 = kHeadersStreamId + 2;
write_blocked_list.RegisterStream(kBlockedId, 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 = kHeadersStreamId + 2;
const QuicStreamId id2 = id1 + 2;
const QuicStreamId id3 = id2 + 2;
write_blocked_list.RegisterStream(id1, kV3LowestPriority);
write_blocked_list.RegisterStream(id2, kV3LowestPriority);
write_blocked_list.RegisterStream(id3, 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.AddStream(id2);
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, kV3HighestPriority);
write_blocked_list.RegisterStream(16, kV3HighestPriority);
write_blocked_list.RegisterStream(5, 5);
write_blocked_list.RegisterStream(4, 5);
write_blocked_list.RegisterStream(7, 7);
write_blocked_list.RegisterStream(kHeadersStreamId, kV3HighestPriority);
write_blocked_list.RegisterStream(kCryptoStreamId, 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(kHeadersStreamId));
EXPECT_FALSE(write_blocked_list.ShouldYield(kCryptoStreamId));
// 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(kHeadersStreamId));
EXPECT_FALSE(write_blocked_list.ShouldYield(kCryptoStreamId));
// Block the headers stream. All streams but crypto and headers should yield.
write_blocked_list.AddStream(kHeadersStreamId);
EXPECT_TRUE(write_blocked_list.ShouldYield(16));
EXPECT_TRUE(write_blocked_list.ShouldYield(15));
EXPECT_FALSE(write_blocked_list.ShouldYield(kHeadersStreamId));
EXPECT_FALSE(write_blocked_list.ShouldYield(kCryptoStreamId));
// Block the crypto stream. All streams but crypto should yield.
write_blocked_list.AddStream(kCryptoStreamId);
EXPECT_TRUE(write_blocked_list.ShouldYield(16));
EXPECT_TRUE(write_blocked_list.ShouldYield(15));
EXPECT_TRUE(write_blocked_list.ShouldYield(kHeadersStreamId));
EXPECT_FALSE(write_blocked_list.ShouldYield(kCryptoStreamId));
}
} // namespace
} // namespace test
} // namespace net
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