blob: dc21a0974418eb2acde50d5463c6973156b86889 [file] [log] [blame]
// Copyright (c) 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 "quic/core/quic_stream_sequencer_buffer.h"
#include <algorithm>
#include <cstddef>
#include <cstdint>
#include <map>
#include <string>
#include <utility>
#include "absl/strings/str_cat.h"
#include "absl/strings/string_view.h"
#include "quic/platform/api/quic_logging.h"
#include "quic/platform/api/quic_test.h"
#include "quic/test_tools/quic_stream_sequencer_buffer_peer.h"
#include "quic/test_tools/quic_test_utils.h"
namespace quic {
namespace test {
absl::string_view IovecToStringPiece(iovec iov) {
return absl::string_view(reinterpret_cast<const char*>(iov.iov_base),
iov.iov_len);
}
char GetCharFromIOVecs(size_t offset, iovec iov[], size_t count) {
size_t start_offset = 0;
for (size_t i = 0; i < count; i++) {
if (iov[i].iov_len == 0) {
continue;
}
size_t end_offset = start_offset + iov[i].iov_len - 1;
if (offset >= start_offset && offset <= end_offset) {
const char* buf = reinterpret_cast<const char*>(iov[i].iov_base);
return buf[offset - start_offset];
}
start_offset += iov[i].iov_len;
}
QUIC_LOG(ERROR) << "Could not locate char at offset " << offset << " in "
<< count << " iovecs";
for (size_t i = 0; i < count; ++i) {
QUIC_LOG(ERROR) << " iov[" << i << "].iov_len = " << iov[i].iov_len;
}
return '\0';
}
const size_t kMaxNumGapsAllowed = 2 * kMaxPacketGap;
static const size_t kBlockSizeBytes =
QuicStreamSequencerBuffer::kBlockSizeBytes;
using BufferBlock = QuicStreamSequencerBuffer::BufferBlock;
namespace {
class QuicStreamSequencerBufferTest : public QuicTest {
public:
void SetUp() override { Initialize(); }
void ResetMaxCapacityBytes(size_t max_capacity_bytes) {
max_capacity_bytes_ = max_capacity_bytes;
Initialize();
}
protected:
void Initialize() {
buffer_ =
std::make_unique<QuicStreamSequencerBuffer>((max_capacity_bytes_));
helper_ = std::make_unique<QuicStreamSequencerBufferPeer>((buffer_.get()));
}
// Use 8.5 here to make sure that the buffer has more than
// QuicStreamSequencerBuffer::kInitialBlockCount block and its end doesn't
// align with the end of a block in order to test all the offset calculation.
size_t max_capacity_bytes_ = 8.5 * kBlockSizeBytes;
std::unique_ptr<QuicStreamSequencerBuffer> buffer_;
std::unique_ptr<QuicStreamSequencerBufferPeer> helper_;
size_t written_ = 0;
std::string error_details_;
};
TEST_F(QuicStreamSequencerBufferTest, InitializeWithMaxRecvWindowSize) {
ResetMaxCapacityBytes(16 * 1024 * 1024); // 16MB
EXPECT_EQ(2 * 1024u, // 16MB / 8KB = 2K
helper_->max_blocks_count());
EXPECT_EQ(max_capacity_bytes_, helper_->max_buffer_capacity());
EXPECT_TRUE(helper_->CheckInitialState());
}
TEST_F(QuicStreamSequencerBufferTest, InitializationWithDifferentSizes) {
const size_t kCapacity = 16 * QuicStreamSequencerBuffer::kBlockSizeBytes;
ResetMaxCapacityBytes(kCapacity);
EXPECT_EQ(max_capacity_bytes_, helper_->max_buffer_capacity());
EXPECT_TRUE(helper_->CheckInitialState());
const size_t kCapacity1 = 32 * QuicStreamSequencerBuffer::kBlockSizeBytes;
ResetMaxCapacityBytes(kCapacity1);
EXPECT_EQ(kCapacity1, helper_->max_buffer_capacity());
EXPECT_TRUE(helper_->CheckInitialState());
}
TEST_F(QuicStreamSequencerBufferTest, ClearOnEmpty) {
buffer_->Clear();
EXPECT_TRUE(helper_->CheckBufferInvariants());
}
TEST_F(QuicStreamSequencerBufferTest, OnStreamData0length) {
QuicErrorCode error =
buffer_->OnStreamData(800, "", &written_, &error_details_);
EXPECT_THAT(error, IsError(QUIC_EMPTY_STREAM_FRAME_NO_FIN));
EXPECT_TRUE(helper_->CheckBufferInvariants());
}
TEST_F(QuicStreamSequencerBufferTest, OnStreamDataWithinBlock) {
EXPECT_FALSE(helper_->IsBufferAllocated());
std::string source(1024, 'a');
EXPECT_THAT(buffer_->OnStreamData(800, source, &written_, &error_details_),
IsQuicNoError());
BufferBlock* block_ptr = helper_->GetBlock(0);
for (size_t i = 0; i < source.size(); ++i) {
ASSERT_EQ('a', block_ptr->buffer[helper_->GetInBlockOffset(800) + i]);
}
EXPECT_EQ(2, helper_->IntervalSize());
EXPECT_EQ(0u, helper_->ReadableBytes());
EXPECT_EQ(1u, helper_->bytes_received().Size());
EXPECT_EQ(800u, helper_->bytes_received().begin()->min());
EXPECT_EQ(1824u, helper_->bytes_received().begin()->max());
EXPECT_TRUE(helper_->CheckBufferInvariants());
EXPECT_TRUE(helper_->IsBufferAllocated());
}
TEST_F(QuicStreamSequencerBufferTest, Move) {
EXPECT_FALSE(helper_->IsBufferAllocated());
std::string source(1024, 'a');
EXPECT_THAT(buffer_->OnStreamData(800, source, &written_, &error_details_),
IsQuicNoError());
BufferBlock* block_ptr = helper_->GetBlock(0);
for (size_t i = 0; i < source.size(); ++i) {
ASSERT_EQ('a', block_ptr->buffer[helper_->GetInBlockOffset(800) + i]);
}
QuicStreamSequencerBuffer buffer2(std::move(*buffer_));
QuicStreamSequencerBufferPeer helper2(&buffer2);
EXPECT_FALSE(helper_->IsBufferAllocated());
EXPECT_EQ(2, helper2.IntervalSize());
EXPECT_EQ(0u, helper2.ReadableBytes());
EXPECT_EQ(1u, helper2.bytes_received().Size());
EXPECT_EQ(800u, helper2.bytes_received().begin()->min());
EXPECT_EQ(1824u, helper2.bytes_received().begin()->max());
EXPECT_TRUE(helper2.CheckBufferInvariants());
EXPECT_TRUE(helper2.IsBufferAllocated());
}
TEST_F(QuicStreamSequencerBufferTest, OnStreamDataInvalidSource) {
// Pass in an invalid source, expects to return error.
absl::string_view source;
source = absl::string_view(nullptr, 1024);
EXPECT_THAT(buffer_->OnStreamData(800, source, &written_, &error_details_),
IsError(QUIC_STREAM_SEQUENCER_INVALID_STATE));
EXPECT_EQ(0u, error_details_.find(absl::StrCat(
"QuicStreamSequencerBuffer error: OnStreamData() "
"dest == nullptr: ",
false, " source == nullptr: ", true)));
}
TEST_F(QuicStreamSequencerBufferTest, OnStreamDataWithOverlap) {
std::string source(1024, 'a');
// Write something into [800, 1824)
EXPECT_THAT(buffer_->OnStreamData(800, source, &written_, &error_details_),
IsQuicNoError());
// Try to write to [0, 1024) and [1024, 2048).
EXPECT_THAT(buffer_->OnStreamData(0, source, &written_, &error_details_),
IsQuicNoError());
EXPECT_THAT(buffer_->OnStreamData(1024, source, &written_, &error_details_),
IsQuicNoError());
}
TEST_F(QuicStreamSequencerBufferTest,
OnStreamDataOverlapAndDuplicateCornerCases) {
std::string source(1024, 'a');
// Write something into [800, 1824)
buffer_->OnStreamData(800, source, &written_, &error_details_);
source = std::string(800, 'b');
std::string one_byte = "c";
// Write [1, 801).
EXPECT_THAT(buffer_->OnStreamData(1, source, &written_, &error_details_),
IsQuicNoError());
// Write [0, 800).
EXPECT_THAT(buffer_->OnStreamData(0, source, &written_, &error_details_),
IsQuicNoError());
// Write [1823, 1824).
EXPECT_THAT(buffer_->OnStreamData(1823, one_byte, &written_, &error_details_),
IsQuicNoError());
EXPECT_EQ(0u, written_);
// write one byte to [1824, 1825)
EXPECT_THAT(buffer_->OnStreamData(1824, one_byte, &written_, &error_details_),
IsQuicNoError());
EXPECT_TRUE(helper_->CheckBufferInvariants());
}
TEST_F(QuicStreamSequencerBufferTest, OnStreamDataWithoutOverlap) {
std::string source(1024, 'a');
// Write something into [800, 1824).
EXPECT_THAT(buffer_->OnStreamData(800, source, &written_, &error_details_),
IsQuicNoError());
source = std::string(100, 'b');
// Write something into [kBlockSizeBytes * 2 - 20, kBlockSizeBytes * 2 + 80).
EXPECT_THAT(buffer_->OnStreamData(kBlockSizeBytes * 2 - 20, source, &written_,
&error_details_),
IsQuicNoError());
EXPECT_EQ(3, helper_->IntervalSize());
EXPECT_EQ(1024u + 100u, buffer_->BytesBuffered());
EXPECT_TRUE(helper_->CheckBufferInvariants());
}
TEST_F(QuicStreamSequencerBufferTest, OnStreamDataInLongStreamWithOverlap) {
// Assume a stream has already buffered almost 4GB.
uint64_t total_bytes_read = pow(2, 32) - 1;
helper_->set_total_bytes_read(total_bytes_read);
helper_->AddBytesReceived(0, total_bytes_read);
// Three new out of order frames arrive.
const size_t kBytesToWrite = 100;
std::string source(kBytesToWrite, 'a');
// Frame [2^32 + 500, 2^32 + 600).
QuicStreamOffset offset = pow(2, 32) + 500;
EXPECT_THAT(buffer_->OnStreamData(offset, source, &written_, &error_details_),
IsQuicNoError());
EXPECT_EQ(2, helper_->IntervalSize());
// Frame [2^32 + 700, 2^32 + 800).
offset = pow(2, 32) + 700;
EXPECT_THAT(buffer_->OnStreamData(offset, source, &written_, &error_details_),
IsQuicNoError());
EXPECT_EQ(3, helper_->IntervalSize());
// Another frame [2^32 + 300, 2^32 + 400).
offset = pow(2, 32) + 300;
EXPECT_THAT(buffer_->OnStreamData(offset, source, &written_, &error_details_),
IsQuicNoError());
EXPECT_EQ(4, helper_->IntervalSize());
}
TEST_F(QuicStreamSequencerBufferTest, OnStreamDataTillEnd) {
// Write 50 bytes to the end.
const size_t kBytesToWrite = 50;
std::string source(kBytesToWrite, 'a');
EXPECT_THAT(buffer_->OnStreamData(max_capacity_bytes_ - kBytesToWrite, source,
&written_, &error_details_),
IsQuicNoError());
EXPECT_EQ(50u, buffer_->BytesBuffered());
EXPECT_TRUE(helper_->CheckBufferInvariants());
}
TEST_F(QuicStreamSequencerBufferTest, OnStreamDataTillEndCorner) {
// Write 1 byte to the end.
const size_t kBytesToWrite = 1;
std::string source(kBytesToWrite, 'a');
EXPECT_THAT(buffer_->OnStreamData(max_capacity_bytes_ - kBytesToWrite, source,
&written_, &error_details_),
IsQuicNoError());
EXPECT_EQ(1u, buffer_->BytesBuffered());
EXPECT_TRUE(helper_->CheckBufferInvariants());
}
TEST_F(QuicStreamSequencerBufferTest, OnStreamDataBeyondCapacity) {
std::string source(60, 'a');
EXPECT_THAT(buffer_->OnStreamData(max_capacity_bytes_ - 50, source, &written_,
&error_details_),
IsError(QUIC_INTERNAL_ERROR));
EXPECT_TRUE(helper_->CheckBufferInvariants());
source = "b";
EXPECT_THAT(buffer_->OnStreamData(max_capacity_bytes_, source, &written_,
&error_details_),
IsError(QUIC_INTERNAL_ERROR));
EXPECT_TRUE(helper_->CheckBufferInvariants());
EXPECT_THAT(buffer_->OnStreamData(max_capacity_bytes_ * 1000, source,
&written_, &error_details_),
IsError(QUIC_INTERNAL_ERROR));
EXPECT_TRUE(helper_->CheckBufferInvariants());
// Disallow current_gap != gaps_.end()
EXPECT_THAT(buffer_->OnStreamData(static_cast<QuicStreamOffset>(-1), source,
&written_, &error_details_),
IsError(QUIC_INTERNAL_ERROR));
EXPECT_TRUE(helper_->CheckBufferInvariants());
// Disallow offset + size overflow
source = "bbb";
EXPECT_THAT(buffer_->OnStreamData(static_cast<QuicStreamOffset>(-2), source,
&written_, &error_details_),
IsError(QUIC_INTERNAL_ERROR));
EXPECT_TRUE(helper_->CheckBufferInvariants());
EXPECT_EQ(0u, buffer_->BytesBuffered());
}
TEST_F(QuicStreamSequencerBufferTest, Readv100Bytes) {
std::string source(1024, 'a');
// Write something into [kBlockSizeBytes, kBlockSizeBytes + 1024).
buffer_->OnStreamData(kBlockSizeBytes, source, &written_, &error_details_);
EXPECT_FALSE(buffer_->HasBytesToRead());
source = std::string(100, 'b');
// Write something into [0, 100).
buffer_->OnStreamData(0, source, &written_, &error_details_);
EXPECT_TRUE(buffer_->HasBytesToRead());
// Read into a iovec array with total capacity of 120 bytes.
char dest[120];
iovec iovecs[3]{iovec{dest, 40}, iovec{dest + 40, 40}, iovec{dest + 80, 40}};
size_t read;
EXPECT_THAT(buffer_->Readv(iovecs, 3, &read, &error_details_),
IsQuicNoError());
QUIC_LOG(ERROR) << error_details_;
EXPECT_EQ(100u, read);
EXPECT_EQ(100u, buffer_->BytesConsumed());
EXPECT_EQ(source, absl::string_view(dest, read));
// The first block should be released as its data has been read out.
EXPECT_EQ(nullptr, helper_->GetBlock(0));
EXPECT_TRUE(helper_->CheckBufferInvariants());
}
TEST_F(QuicStreamSequencerBufferTest, ReadvAcrossBlocks) {
std::string source(kBlockSizeBytes + 50, 'a');
// Write 1st block to full and extand 50 bytes to next block.
buffer_->OnStreamData(0, source, &written_, &error_details_);
EXPECT_EQ(source.size(), helper_->ReadableBytes());
// Iteratively read 512 bytes from buffer_-> Overwrite dest[] each time.
char dest[512];
while (helper_->ReadableBytes()) {
std::fill(dest, dest + 512, 0);
iovec iovecs[2]{iovec{dest, 256}, iovec{dest + 256, 256}};
size_t read;
EXPECT_THAT(buffer_->Readv(iovecs, 2, &read, &error_details_),
IsQuicNoError());
}
// The last read only reads the rest 50 bytes in 2nd block.
EXPECT_EQ(std::string(50, 'a'), std::string(dest, 50));
EXPECT_EQ(0, dest[50]) << "Dest[50] shouln't be filled.";
EXPECT_EQ(source.size(), buffer_->BytesConsumed());
EXPECT_TRUE(buffer_->Empty());
EXPECT_TRUE(helper_->CheckBufferInvariants());
}
TEST_F(QuicStreamSequencerBufferTest, ClearAfterRead) {
std::string source(kBlockSizeBytes + 50, 'a');
// Write 1st block to full with 'a'.
buffer_->OnStreamData(0, source, &written_, &error_details_);
// Read first 512 bytes from buffer to make space at the beginning.
char dest[512]{0};
const iovec iov{dest, 512};
size_t read;
EXPECT_THAT(buffer_->Readv(&iov, 1, &read, &error_details_), IsQuicNoError());
// Clear() should make buffer empty while preserving BytesConsumed()
buffer_->Clear();
EXPECT_TRUE(buffer_->Empty());
EXPECT_TRUE(helper_->CheckBufferInvariants());
}
TEST_F(QuicStreamSequencerBufferTest,
OnStreamDataAcrossLastBlockAndFillCapacity) {
std::string source(kBlockSizeBytes + 50, 'a');
// Write 1st block to full with 'a'.
buffer_->OnStreamData(0, source, &written_, &error_details_);
// Read first 512 bytes from buffer to make space at the beginning.
char dest[512]{0};
const iovec iov{dest, 512};
size_t read;
EXPECT_THAT(buffer_->Readv(&iov, 1, &read, &error_details_), IsQuicNoError());
EXPECT_EQ(source.size(), written_);
// Write more than half block size of bytes in the last block with 'b', which
// will wrap to the beginning and reaches the full capacity.
source = std::string(0.5 * kBlockSizeBytes + 512, 'b');
EXPECT_THAT(buffer_->OnStreamData(2 * kBlockSizeBytes, source, &written_,
&error_details_),
IsQuicNoError());
EXPECT_EQ(source.size(), written_);
EXPECT_TRUE(helper_->CheckBufferInvariants());
}
TEST_F(QuicStreamSequencerBufferTest,
OnStreamDataAcrossLastBlockAndExceedCapacity) {
std::string source(kBlockSizeBytes + 50, 'a');
// Write 1st block to full.
buffer_->OnStreamData(0, source, &written_, &error_details_);
// Read first 512 bytes from buffer to make space at the beginning.
char dest[512]{0};
const iovec iov{dest, 512};
size_t read;
EXPECT_THAT(buffer_->Readv(&iov, 1, &read, &error_details_), IsQuicNoError());
// Try to write from [max_capacity_bytes_ - 0.5 * kBlockSizeBytes,
// max_capacity_bytes_ + 512 + 1). But last bytes exceeds current capacity.
source = std::string(0.5 * kBlockSizeBytes + 512 + 1, 'b');
EXPECT_THAT(buffer_->OnStreamData(8 * kBlockSizeBytes, source, &written_,
&error_details_),
IsError(QUIC_INTERNAL_ERROR));
EXPECT_TRUE(helper_->CheckBufferInvariants());
}
TEST_F(QuicStreamSequencerBufferTest, ReadvAcrossLastBlock) {
// Write to full capacity and read out 512 bytes at beginning and continue
// appending 256 bytes.
std::string source(max_capacity_bytes_, 'a');
buffer_->OnStreamData(0, source, &written_, &error_details_);
char dest[512]{0};
const iovec iov{dest, 512};
size_t read;
EXPECT_THAT(buffer_->Readv(&iov, 1, &read, &error_details_), IsQuicNoError());
source = std::string(256, 'b');
buffer_->OnStreamData(max_capacity_bytes_, source, &written_,
&error_details_);
EXPECT_TRUE(helper_->CheckBufferInvariants());
// Read all data out.
std::unique_ptr<char[]> dest1{new char[max_capacity_bytes_]};
dest1[0] = 0;
const iovec iov1{dest1.get(), max_capacity_bytes_};
EXPECT_THAT(buffer_->Readv(&iov1, 1, &read, &error_details_),
IsQuicNoError());
EXPECT_EQ(max_capacity_bytes_ - 512 + 256, read);
EXPECT_EQ(max_capacity_bytes_ + 256, buffer_->BytesConsumed());
EXPECT_TRUE(buffer_->Empty());
EXPECT_TRUE(helper_->CheckBufferInvariants());
}
TEST_F(QuicStreamSequencerBufferTest, ReadvEmpty) {
char dest[512]{0};
iovec iov{dest, 512};
size_t read;
EXPECT_THAT(buffer_->Readv(&iov, 1, &read, &error_details_), IsQuicNoError());
EXPECT_EQ(0u, read);
EXPECT_TRUE(helper_->CheckBufferInvariants());
}
TEST_F(QuicStreamSequencerBufferTest, GetReadableRegionsEmpty) {
iovec iovs[2];
int iov_count = buffer_->GetReadableRegions(iovs, 2);
EXPECT_EQ(0, iov_count);
EXPECT_EQ(nullptr, iovs[iov_count].iov_base);
EXPECT_EQ(0u, iovs[iov_count].iov_len);
}
TEST_F(QuicStreamSequencerBufferTest, ReleaseWholeBuffer) {
// Tests that buffer is not deallocated unless ReleaseWholeBuffer() is called.
std::string source(100, 'b');
// Write something into [0, 100).
buffer_->OnStreamData(0, source, &written_, &error_details_);
EXPECT_TRUE(buffer_->HasBytesToRead());
char dest[120];
iovec iovecs[3]{iovec{dest, 40}, iovec{dest + 40, 40}, iovec{dest + 80, 40}};
size_t read;
EXPECT_THAT(buffer_->Readv(iovecs, 3, &read, &error_details_),
IsQuicNoError());
EXPECT_EQ(100u, read);
EXPECT_EQ(100u, buffer_->BytesConsumed());
EXPECT_TRUE(helper_->CheckBufferInvariants());
EXPECT_TRUE(helper_->IsBufferAllocated());
buffer_->ReleaseWholeBuffer();
EXPECT_FALSE(helper_->IsBufferAllocated());
}
TEST_F(QuicStreamSequencerBufferTest, GetReadableRegionsBlockedByGap) {
// Write into [1, 1024).
std::string source(1023, 'a');
buffer_->OnStreamData(1, source, &written_, &error_details_);
// Try to get readable regions, but none is there.
iovec iovs[2];
int iov_count = buffer_->GetReadableRegions(iovs, 2);
EXPECT_EQ(0, iov_count);
}
TEST_F(QuicStreamSequencerBufferTest, GetReadableRegionsTillEndOfBlock) {
// Write first block to full with [0, 256) 'a' and the rest 'b' then read out
// [0, 256)
std::string source(kBlockSizeBytes, 'a');
buffer_->OnStreamData(0, source, &written_, &error_details_);
char dest[256];
helper_->Read(dest, 256);
// Get readable region from [256, 1024)
iovec iovs[2];
int iov_count = buffer_->GetReadableRegions(iovs, 2);
EXPECT_EQ(1, iov_count);
EXPECT_EQ(std::string(kBlockSizeBytes - 256, 'a'),
IovecToStringPiece(iovs[0]));
}
TEST_F(QuicStreamSequencerBufferTest, GetReadableRegionsWithinOneBlock) {
// Write into [0, 1024) and then read out [0, 256)
std::string source(1024, 'a');
buffer_->OnStreamData(0, source, &written_, &error_details_);
char dest[256];
helper_->Read(dest, 256);
// Get readable region from [256, 1024)
iovec iovs[2];
int iov_count = buffer_->GetReadableRegions(iovs, 2);
EXPECT_EQ(1, iov_count);
EXPECT_EQ(std::string(1024 - 256, 'a'), IovecToStringPiece(iovs[0]));
}
TEST_F(QuicStreamSequencerBufferTest,
GetReadableRegionsAcrossBlockWithLongIOV) {
// Write into [0, 2 * kBlockSizeBytes + 1024) and then read out [0, 1024)
std::string source(2 * kBlockSizeBytes + 1024, 'a');
buffer_->OnStreamData(0, source, &written_, &error_details_);
char dest[1024];
helper_->Read(dest, 1024);
iovec iovs[4];
int iov_count = buffer_->GetReadableRegions(iovs, 4);
EXPECT_EQ(3, iov_count);
EXPECT_EQ(kBlockSizeBytes - 1024, iovs[0].iov_len);
EXPECT_EQ(kBlockSizeBytes, iovs[1].iov_len);
EXPECT_EQ(1024u, iovs[2].iov_len);
}
TEST_F(QuicStreamSequencerBufferTest,
GetReadableRegionsWithMultipleIOVsAcrossEnd) {
// Write into [0, 8.5 * kBlockSizeBytes - 1024) and then read out [0, 1024)
// and then append 1024 + 512 bytes.
std::string source(8.5 * kBlockSizeBytes - 1024, 'a');
buffer_->OnStreamData(0, source, &written_, &error_details_);
char dest[1024];
helper_->Read(dest, 1024);
// Write across the end.
source = std::string(1024 + 512, 'b');
buffer_->OnStreamData(8.5 * kBlockSizeBytes - 1024, source, &written_,
&error_details_);
// Use short iovec's.
iovec iovs[2];
int iov_count = buffer_->GetReadableRegions(iovs, 2);
EXPECT_EQ(2, iov_count);
EXPECT_EQ(kBlockSizeBytes - 1024, iovs[0].iov_len);
EXPECT_EQ(kBlockSizeBytes, iovs[1].iov_len);
// Use long iovec's and wrap the end of buffer.
iovec iovs1[11];
EXPECT_EQ(10, buffer_->GetReadableRegions(iovs1, 11));
EXPECT_EQ(0.5 * kBlockSizeBytes, iovs1[8].iov_len);
EXPECT_EQ(512u, iovs1[9].iov_len);
EXPECT_EQ(std::string(512, 'b'), IovecToStringPiece(iovs1[9]));
}
TEST_F(QuicStreamSequencerBufferTest, GetReadableRegionEmpty) {
iovec iov;
EXPECT_FALSE(buffer_->GetReadableRegion(&iov));
EXPECT_EQ(nullptr, iov.iov_base);
EXPECT_EQ(0u, iov.iov_len);
}
TEST_F(QuicStreamSequencerBufferTest, GetReadableRegionBeforeGap) {
// Write into [1, 1024).
std::string source(1023, 'a');
buffer_->OnStreamData(1, source, &written_, &error_details_);
// GetReadableRegion should return false because range [0,1) hasn't been
// filled yet.
iovec iov;
EXPECT_FALSE(buffer_->GetReadableRegion(&iov));
}
TEST_F(QuicStreamSequencerBufferTest, GetReadableRegionTillEndOfBlock) {
// Write into [0, kBlockSizeBytes + 1) and then read out [0, 256)
std::string source(kBlockSizeBytes + 1, 'a');
buffer_->OnStreamData(0, source, &written_, &error_details_);
char dest[256];
helper_->Read(dest, 256);
// Get readable region from [256, 1024)
iovec iov;
EXPECT_TRUE(buffer_->GetReadableRegion(&iov));
EXPECT_EQ(std::string(kBlockSizeBytes - 256, 'a'), IovecToStringPiece(iov));
}
TEST_F(QuicStreamSequencerBufferTest, GetReadableRegionTillGap) {
// Write into [0, kBlockSizeBytes - 1) and then read out [0, 256)
std::string source(kBlockSizeBytes - 1, 'a');
buffer_->OnStreamData(0, source, &written_, &error_details_);
char dest[256];
helper_->Read(dest, 256);
// Get readable region from [256, 1023)
iovec iov;
EXPECT_TRUE(buffer_->GetReadableRegion(&iov));
EXPECT_EQ(std::string(kBlockSizeBytes - 1 - 256, 'a'),
IovecToStringPiece(iov));
}
TEST_F(QuicStreamSequencerBufferTest, PeekEmptyBuffer) {
iovec iov;
EXPECT_FALSE(buffer_->PeekRegion(0, &iov));
EXPECT_FALSE(buffer_->PeekRegion(1, &iov));
EXPECT_FALSE(buffer_->PeekRegion(100, &iov));
}
TEST_F(QuicStreamSequencerBufferTest, PeekSingleBlock) {
std::string source(kBlockSizeBytes, 'a');
buffer_->OnStreamData(0, source, &written_, &error_details_);
iovec iov;
EXPECT_TRUE(buffer_->PeekRegion(0, &iov));
EXPECT_EQ(source, IovecToStringPiece(iov));
// Peeking again gives the same result.
EXPECT_TRUE(buffer_->PeekRegion(0, &iov));
EXPECT_EQ(source, IovecToStringPiece(iov));
// Peek at a different offset.
EXPECT_TRUE(buffer_->PeekRegion(100, &iov));
EXPECT_EQ(absl::string_view(source).substr(100), IovecToStringPiece(iov));
// Peeking at or after FirstMissingByte() returns false.
EXPECT_FALSE(buffer_->PeekRegion(kBlockSizeBytes, &iov));
EXPECT_FALSE(buffer_->PeekRegion(kBlockSizeBytes + 1, &iov));
}
TEST_F(QuicStreamSequencerBufferTest, PeekTwoWritesInSingleBlock) {
const size_t length1 = 1024;
std::string source1(length1, 'a');
buffer_->OnStreamData(0, source1, &written_, &error_details_);
iovec iov;
EXPECT_TRUE(buffer_->PeekRegion(0, &iov));
EXPECT_EQ(source1, IovecToStringPiece(iov));
// The second frame goes into the same block.
const size_t length2 = 800;
std::string source2(length2, 'b');
buffer_->OnStreamData(length1, source2, &written_, &error_details_);
EXPECT_TRUE(buffer_->PeekRegion(length1, &iov));
EXPECT_EQ(source2, IovecToStringPiece(iov));
// Peek with an offset inside the first write.
const QuicStreamOffset offset1 = 500;
EXPECT_TRUE(buffer_->PeekRegion(offset1, &iov));
EXPECT_EQ(absl::string_view(source1).substr(offset1),
IovecToStringPiece(iov).substr(0, length1 - offset1));
EXPECT_EQ(absl::string_view(source2),
IovecToStringPiece(iov).substr(length1 - offset1));
// Peek with an offset inside the second write.
const QuicStreamOffset offset2 = 1500;
EXPECT_TRUE(buffer_->PeekRegion(offset2, &iov));
EXPECT_EQ(absl::string_view(source2).substr(offset2 - length1),
IovecToStringPiece(iov));
// Peeking at or after FirstMissingByte() returns false.
EXPECT_FALSE(buffer_->PeekRegion(length1 + length2, &iov));
EXPECT_FALSE(buffer_->PeekRegion(length1 + length2 + 1, &iov));
}
TEST_F(QuicStreamSequencerBufferTest, PeekBufferWithMultipleBlocks) {
const size_t length1 = 1024;
std::string source1(length1, 'a');
buffer_->OnStreamData(0, source1, &written_, &error_details_);
iovec iov;
EXPECT_TRUE(buffer_->PeekRegion(0, &iov));
EXPECT_EQ(source1, IovecToStringPiece(iov));
const size_t length2 = kBlockSizeBytes + 2;
std::string source2(length2, 'b');
buffer_->OnStreamData(length1, source2, &written_, &error_details_);
// Peek with offset 0 returns the entire block.
EXPECT_TRUE(buffer_->PeekRegion(0, &iov));
EXPECT_EQ(kBlockSizeBytes, iov.iov_len);
EXPECT_EQ(source1, IovecToStringPiece(iov).substr(0, length1));
EXPECT_EQ(absl::string_view(source2).substr(0, kBlockSizeBytes - length1),
IovecToStringPiece(iov).substr(length1));
EXPECT_TRUE(buffer_->PeekRegion(length1, &iov));
EXPECT_EQ(absl::string_view(source2).substr(0, kBlockSizeBytes - length1),
IovecToStringPiece(iov));
EXPECT_TRUE(buffer_->PeekRegion(kBlockSizeBytes, &iov));
EXPECT_EQ(absl::string_view(source2).substr(kBlockSizeBytes - length1),
IovecToStringPiece(iov));
// Peeking at or after FirstMissingByte() returns false.
EXPECT_FALSE(buffer_->PeekRegion(length1 + length2, &iov));
EXPECT_FALSE(buffer_->PeekRegion(length1 + length2 + 1, &iov));
}
TEST_F(QuicStreamSequencerBufferTest, PeekAfterConsumed) {
std::string source1(kBlockSizeBytes, 'a');
buffer_->OnStreamData(0, source1, &written_, &error_details_);
iovec iov;
EXPECT_TRUE(buffer_->PeekRegion(0, &iov));
EXPECT_EQ(source1, IovecToStringPiece(iov));
// Consume some data.
EXPECT_TRUE(buffer_->MarkConsumed(1024));
// Peeking into consumed data fails.
EXPECT_FALSE(buffer_->PeekRegion(0, &iov));
EXPECT_FALSE(buffer_->PeekRegion(512, &iov));
EXPECT_TRUE(buffer_->PeekRegion(1024, &iov));
EXPECT_EQ(absl::string_view(source1).substr(1024), IovecToStringPiece(iov));
EXPECT_TRUE(buffer_->PeekRegion(1500, &iov));
EXPECT_EQ(absl::string_view(source1).substr(1500), IovecToStringPiece(iov));
// Consume rest of block.
EXPECT_TRUE(buffer_->MarkConsumed(kBlockSizeBytes - 1024));
// Read new data.
std::string source2(300, 'b');
buffer_->OnStreamData(kBlockSizeBytes, source2, &written_, &error_details_);
// Peek into new data.
EXPECT_TRUE(buffer_->PeekRegion(kBlockSizeBytes, &iov));
EXPECT_EQ(source2, IovecToStringPiece(iov));
EXPECT_TRUE(buffer_->PeekRegion(kBlockSizeBytes + 128, &iov));
EXPECT_EQ(absl::string_view(source2).substr(128), IovecToStringPiece(iov));
// Peeking into consumed data still fails.
EXPECT_FALSE(buffer_->PeekRegion(0, &iov));
EXPECT_FALSE(buffer_->PeekRegion(512, &iov));
EXPECT_FALSE(buffer_->PeekRegion(1024, &iov));
EXPECT_FALSE(buffer_->PeekRegion(1500, &iov));
}
TEST_F(QuicStreamSequencerBufferTest, PeekContinously) {
std::string source1(kBlockSizeBytes, 'a');
buffer_->OnStreamData(0, source1, &written_, &error_details_);
iovec iov;
EXPECT_TRUE(buffer_->PeekRegion(0, &iov));
EXPECT_EQ(source1, IovecToStringPiece(iov));
std::string source2(kBlockSizeBytes, 'b');
buffer_->OnStreamData(kBlockSizeBytes, source2, &written_, &error_details_);
EXPECT_TRUE(buffer_->PeekRegion(kBlockSizeBytes, &iov));
EXPECT_EQ(source2, IovecToStringPiece(iov));
// First block is still there.
EXPECT_TRUE(buffer_->PeekRegion(0, &iov));
EXPECT_EQ(source1, IovecToStringPiece(iov));
}
TEST_F(QuicStreamSequencerBufferTest, MarkConsumedInOneBlock) {
// Write into [0, 1024) and then read out [0, 256)
std::string source(1024, 'a');
buffer_->OnStreamData(0, source, &written_, &error_details_);
char dest[256];
helper_->Read(dest, 256);
EXPECT_TRUE(buffer_->MarkConsumed(512));
EXPECT_EQ(256u + 512u, buffer_->BytesConsumed());
EXPECT_EQ(256u, helper_->ReadableBytes());
buffer_->MarkConsumed(256);
EXPECT_TRUE(buffer_->Empty());
EXPECT_TRUE(helper_->CheckBufferInvariants());
}
TEST_F(QuicStreamSequencerBufferTest, MarkConsumedNotEnoughBytes) {
// Write into [0, 1024) and then read out [0, 256)
std::string source(1024, 'a');
buffer_->OnStreamData(0, source, &written_, &error_details_);
char dest[256];
helper_->Read(dest, 256);
// Consume 1st 512 bytes
EXPECT_TRUE(buffer_->MarkConsumed(512));
EXPECT_EQ(256u + 512u, buffer_->BytesConsumed());
EXPECT_EQ(256u, helper_->ReadableBytes());
// Try to consume one bytes more than available. Should return false.
EXPECT_FALSE(buffer_->MarkConsumed(257));
EXPECT_EQ(256u + 512u, buffer_->BytesConsumed());
iovec iov;
EXPECT_TRUE(buffer_->GetReadableRegion(&iov));
EXPECT_TRUE(helper_->CheckBufferInvariants());
}
TEST_F(QuicStreamSequencerBufferTest, MarkConsumedAcrossBlock) {
// Write into [0, 2 * kBlockSizeBytes + 1024) and then read out [0, 1024)
std::string source(2 * kBlockSizeBytes + 1024, 'a');
buffer_->OnStreamData(0, source, &written_, &error_details_);
char dest[1024];
helper_->Read(dest, 1024);
buffer_->MarkConsumed(2 * kBlockSizeBytes);
EXPECT_EQ(source.size(), buffer_->BytesConsumed());
EXPECT_TRUE(buffer_->Empty());
EXPECT_TRUE(helper_->CheckBufferInvariants());
}
TEST_F(QuicStreamSequencerBufferTest, MarkConsumedAcrossEnd) {
// Write into [0, 8.5 * kBlockSizeBytes - 1024) and then read out [0, 1024)
// and then append 1024 + 512 bytes.
std::string source(8.5 * kBlockSizeBytes - 1024, 'a');
buffer_->OnStreamData(0, source, &written_, &error_details_);
char dest[1024];
helper_->Read(dest, 1024);
source = std::string(1024 + 512, 'b');
buffer_->OnStreamData(8.5 * kBlockSizeBytes - 1024, source, &written_,
&error_details_);
EXPECT_EQ(1024u, buffer_->BytesConsumed());
// Consume to the end of 8th block.
buffer_->MarkConsumed(8 * kBlockSizeBytes - 1024);
EXPECT_EQ(8 * kBlockSizeBytes, buffer_->BytesConsumed());
// Consume across the physical end of buffer
buffer_->MarkConsumed(0.5 * kBlockSizeBytes + 500);
EXPECT_EQ(max_capacity_bytes_ + 500, buffer_->BytesConsumed());
EXPECT_EQ(12u, helper_->ReadableBytes());
// Consume to the logical end of buffer
buffer_->MarkConsumed(12);
EXPECT_EQ(max_capacity_bytes_ + 512, buffer_->BytesConsumed());
EXPECT_TRUE(buffer_->Empty());
EXPECT_TRUE(helper_->CheckBufferInvariants());
}
TEST_F(QuicStreamSequencerBufferTest, FlushBufferedFrames) {
// Write into [0, 8.5 * kBlockSizeBytes - 1024) and then read out [0, 1024).
std::string source(max_capacity_bytes_ - 1024, 'a');
buffer_->OnStreamData(0, source, &written_, &error_details_);
char dest[1024];
helper_->Read(dest, 1024);
EXPECT_EQ(1024u, buffer_->BytesConsumed());
// Write [1024, 512) to the physical beginning.
source = std::string(512, 'b');
buffer_->OnStreamData(max_capacity_bytes_, source, &written_,
&error_details_);
EXPECT_EQ(512u, written_);
EXPECT_EQ(max_capacity_bytes_ - 1024 + 512, buffer_->FlushBufferedFrames());
EXPECT_EQ(max_capacity_bytes_ + 512, buffer_->BytesConsumed());
EXPECT_TRUE(buffer_->Empty());
EXPECT_TRUE(helper_->CheckBufferInvariants());
// Clear buffer at this point should still preserve BytesConsumed().
buffer_->Clear();
EXPECT_EQ(max_capacity_bytes_ + 512, buffer_->BytesConsumed());
EXPECT_TRUE(helper_->CheckBufferInvariants());
}
TEST_F(QuicStreamSequencerBufferTest, TooManyGaps) {
// Make sure max capacity is large enough that it is possible to have more
// than |kMaxNumGapsAllowed| number of gaps.
max_capacity_bytes_ = 3 * kBlockSizeBytes;
// Feed buffer with 1-byte discontiguous frames. e.g. [1,2), [3,4), [5,6)...
for (QuicStreamOffset begin = 1; begin <= max_capacity_bytes_; begin += 2) {
QuicErrorCode rs =
buffer_->OnStreamData(begin, "a", &written_, &error_details_);
QuicStreamOffset last_straw = 2 * kMaxNumGapsAllowed - 1;
if (begin == last_straw) {
EXPECT_THAT(rs, IsError(QUIC_TOO_MANY_STREAM_DATA_INTERVALS));
EXPECT_EQ("Too many data intervals received for this stream.",
error_details_);
break;
}
}
}
class QuicStreamSequencerBufferRandomIOTest
: public QuicStreamSequencerBufferTest {
public:
using OffsetSizePair = std::pair<QuicStreamOffset, size_t>;
void SetUp() override {
// Test against a larger capacity then above tests. Also make sure the last
// block is partially available to use.
max_capacity_bytes_ = 8.25 * kBlockSizeBytes;
// Stream to be buffered should be larger than the capacity to test wrap
// around.
bytes_to_buffer_ = 2 * max_capacity_bytes_;
Initialize();
uint64_t seed = QuicRandom::GetInstance()->RandUint64();
QUIC_LOG(INFO) << "**** The current seed is " << seed << " ****";
rng_.set_seed(seed);
}
// Create an out-of-order source stream with given size to populate
// shuffled_buf_.
void CreateSourceAndShuffle(size_t max_chunk_size_bytes) {
max_chunk_size_bytes_ = max_chunk_size_bytes;
std::unique_ptr<OffsetSizePair[]> chopped_stream(
new OffsetSizePair[bytes_to_buffer_]);
// Split stream into small chunks with random length. chopped_stream will be
// populated with segmented stream chunks.
size_t start_chopping_offset = 0;
size_t iterations = 0;
while (start_chopping_offset < bytes_to_buffer_) {
size_t max_chunk = std::min<size_t>(
max_chunk_size_bytes_, bytes_to_buffer_ - start_chopping_offset);
size_t chunk_size = rng_.RandUint64() % max_chunk + 1;
chopped_stream[iterations] =
OffsetSizePair(start_chopping_offset, chunk_size);
start_chopping_offset += chunk_size;
++iterations;
}
QUICHE_DCHECK(start_chopping_offset == bytes_to_buffer_);
size_t chunk_num = iterations;
// Randomly change the sequence of in-ordered OffsetSizePairs to make a
// out-of-order array of OffsetSizePairs.
for (int i = chunk_num - 1; i >= 0; --i) {
size_t random_idx = rng_.RandUint64() % (i + 1);
QUIC_DVLOG(1) << "chunk offset " << chopped_stream[random_idx].first
<< " size " << chopped_stream[random_idx].second;
shuffled_buf_.push_front(chopped_stream[random_idx]);
chopped_stream[random_idx] = chopped_stream[i];
}
}
// Write the currently first chunk of data in the out-of-order stream into
// QuicStreamSequencerBuffer. If current chuck cannot be written into buffer
// because it goes beyond current capacity, move it to the end of
// shuffled_buf_ and write it later.
void WriteNextChunkToBuffer() {
OffsetSizePair& chunk = shuffled_buf_.front();
QuicStreamOffset offset = chunk.first;
const size_t num_to_write = chunk.second;
std::unique_ptr<char[]> write_buf{new char[max_chunk_size_bytes_]};
for (size_t i = 0; i < num_to_write; ++i) {
write_buf[i] = (offset + i) % 256;
}
absl::string_view string_piece_w(write_buf.get(), num_to_write);
auto result = buffer_->OnStreamData(offset, string_piece_w, &written_,
&error_details_);
if (result == QUIC_NO_ERROR) {
shuffled_buf_.pop_front();
total_bytes_written_ += num_to_write;
} else {
// This chunk offset exceeds window size.
shuffled_buf_.push_back(chunk);
shuffled_buf_.pop_front();
}
QUIC_DVLOG(1) << " write at offset: " << offset
<< " len to write: " << num_to_write
<< " write result: " << result
<< " left over: " << shuffled_buf_.size();
}
protected:
std::list<OffsetSizePair> shuffled_buf_;
size_t max_chunk_size_bytes_;
QuicStreamOffset bytes_to_buffer_;
size_t total_bytes_written_ = 0;
size_t total_bytes_read_ = 0;
SimpleRandom rng_;
};
TEST_F(QuicStreamSequencerBufferRandomIOTest, RandomWriteAndReadv) {
// Set kMaxReadSize larger than kBlockSizeBytes to test both small and large
// read.
const size_t kMaxReadSize = kBlockSizeBytes * 2;
// kNumReads is larger than 1 to test how multiple read destinations work.
const size_t kNumReads = 2;
// Since write and read operation have equal possibility to be called. Bytes
// to be written into and read out of should roughly the same.
const size_t kMaxWriteSize = kNumReads * kMaxReadSize;
size_t iterations = 0;
CreateSourceAndShuffle(kMaxWriteSize);
while ((!shuffled_buf_.empty() || total_bytes_read_ < bytes_to_buffer_) &&
iterations <= 2 * bytes_to_buffer_) {
uint8_t next_action =
shuffled_buf_.empty() ? uint8_t{1} : rng_.RandUint64() % 2;
QUIC_DVLOG(1) << "iteration: " << iterations;
switch (next_action) {
case 0: { // write
WriteNextChunkToBuffer();
ASSERT_TRUE(helper_->CheckBufferInvariants());
break;
}
case 1: { // readv
std::unique_ptr<char[][kMaxReadSize]> read_buf{
new char[kNumReads][kMaxReadSize]};
iovec dest_iov[kNumReads];
size_t num_to_read = 0;
for (size_t i = 0; i < kNumReads; ++i) {
dest_iov[i].iov_base =
reinterpret_cast<void*>(const_cast<char*>(read_buf[i]));
dest_iov[i].iov_len = rng_.RandUint64() % kMaxReadSize;
num_to_read += dest_iov[i].iov_len;
}
size_t actually_read;
EXPECT_THAT(buffer_->Readv(dest_iov, kNumReads, &actually_read,
&error_details_),
IsQuicNoError());
ASSERT_LE(actually_read, num_to_read);
QUIC_DVLOG(1) << " read from offset: " << total_bytes_read_
<< " size: " << num_to_read
<< " actual read: " << actually_read;
for (size_t i = 0; i < actually_read; ++i) {
char ch = (i + total_bytes_read_) % 256;
ASSERT_EQ(ch, GetCharFromIOVecs(i, dest_iov, kNumReads))
<< " at iteration " << iterations;
}
total_bytes_read_ += actually_read;
ASSERT_EQ(total_bytes_read_, buffer_->BytesConsumed());
ASSERT_TRUE(helper_->CheckBufferInvariants());
break;
}
}
++iterations;
ASSERT_LE(total_bytes_read_, total_bytes_written_);
}
EXPECT_LT(iterations, bytes_to_buffer_) << "runaway test";
EXPECT_LE(bytes_to_buffer_, total_bytes_read_)
<< "iterations: " << iterations;
EXPECT_LE(bytes_to_buffer_, total_bytes_written_);
}
TEST_F(QuicStreamSequencerBufferRandomIOTest, RandomWriteAndConsumeInPlace) {
// The value 4 is chosen such that the max write size is no larger than the
// maximum buffer capacity.
const size_t kMaxNumReads = 4;
// Adjust write amount be roughly equal to that GetReadableRegions() can get.
const size_t kMaxWriteSize = kMaxNumReads * kBlockSizeBytes;
ASSERT_LE(kMaxWriteSize, max_capacity_bytes_);
size_t iterations = 0;
CreateSourceAndShuffle(kMaxWriteSize);
while ((!shuffled_buf_.empty() || total_bytes_read_ < bytes_to_buffer_) &&
iterations <= 2 * bytes_to_buffer_) {
uint8_t next_action =
shuffled_buf_.empty() ? uint8_t{1} : rng_.RandUint64() % 2;
QUIC_DVLOG(1) << "iteration: " << iterations;
switch (next_action) {
case 0: { // write
WriteNextChunkToBuffer();
ASSERT_TRUE(helper_->CheckBufferInvariants());
break;
}
case 1: { // GetReadableRegions and then MarkConsumed
size_t num_read = rng_.RandUint64() % kMaxNumReads + 1;
iovec dest_iov[kMaxNumReads];
ASSERT_TRUE(helper_->CheckBufferInvariants());
size_t actually_num_read =
buffer_->GetReadableRegions(dest_iov, num_read);
ASSERT_LE(actually_num_read, num_read);
size_t avail_bytes = 0;
for (size_t i = 0; i < actually_num_read; ++i) {
avail_bytes += dest_iov[i].iov_len;
}
// process random number of bytes (check the value of each byte).
size_t bytes_to_process = rng_.RandUint64() % (avail_bytes + 1);
size_t bytes_processed = 0;
for (size_t i = 0; i < actually_num_read; ++i) {
size_t bytes_in_block = std::min<size_t>(
bytes_to_process - bytes_processed, dest_iov[i].iov_len);
if (bytes_in_block == 0) {
break;
}
for (size_t j = 0; j < bytes_in_block; ++j) {
ASSERT_LE(bytes_processed, bytes_to_process);
char char_expected =
(buffer_->BytesConsumed() + bytes_processed) % 256;
ASSERT_EQ(char_expected,
reinterpret_cast<const char*>(dest_iov[i].iov_base)[j])
<< " at iteration " << iterations;
++bytes_processed;
}
}
buffer_->MarkConsumed(bytes_processed);
QUIC_DVLOG(1) << "iteration " << iterations << ": try to get "
<< num_read << " readable regions, actually get "
<< actually_num_read
<< " from offset: " << total_bytes_read_
<< "\nprocesse bytes: " << bytes_processed;
total_bytes_read_ += bytes_processed;
ASSERT_EQ(total_bytes_read_, buffer_->BytesConsumed());
ASSERT_TRUE(helper_->CheckBufferInvariants());
break;
}
}
++iterations;
ASSERT_LE(total_bytes_read_, total_bytes_written_);
}
EXPECT_LT(iterations, bytes_to_buffer_) << "runaway test";
EXPECT_LE(bytes_to_buffer_, total_bytes_read_)
<< "iterations: " << iterations;
EXPECT_LE(bytes_to_buffer_, total_bytes_written_);
}
TEST_F(QuicStreamSequencerBufferTest, GrowBlockSizeOnDemand) {
SetQuicReloadableFlag(quic_allocate_stream_sequencer_buffer_blocks_on_demand,
true);
max_capacity_bytes_ = 1024 * kBlockSizeBytes;
std::string source_of_one_block(kBlockSizeBytes, 'a');
Initialize();
ASSERT_EQ(helper_->current_blocks_count(), 0u);
// A minimum of 8 blocks are allocated
buffer_->OnStreamData(0, source_of_one_block, &written_, &error_details_);
ASSERT_EQ(helper_->current_blocks_count(), 8u);
// Number of blocks doesn't grow if the data is within the capacity.
buffer_->OnStreamData(kBlockSizeBytes * 7, source_of_one_block, &written_,
&error_details_);
ASSERT_EQ(helper_->current_blocks_count(), 8u);
// Number of blocks grows by a factor of 4 normally.
buffer_->OnStreamData(kBlockSizeBytes * 8, "a", &written_, &error_details_);
ASSERT_EQ(helper_->current_blocks_count(), 32u);
// Number of blocks grow to the demanded size of 140 instead of 128 since
// that's not enough.
buffer_->OnStreamData(kBlockSizeBytes * 139, source_of_one_block, &written_,
&error_details_);
ASSERT_EQ(helper_->current_blocks_count(), 140u);
// Number of blocks grows by a factor of 4 normally.
buffer_->OnStreamData(kBlockSizeBytes * 140, source_of_one_block, &written_,
&error_details_);
ASSERT_EQ(helper_->current_blocks_count(), 560u);
// max_capacity_bytes is reached and number of blocks is capped.
buffer_->OnStreamData(kBlockSizeBytes * 560, source_of_one_block, &written_,
&error_details_);
ASSERT_EQ(helper_->current_blocks_count(), 1024u);
// max_capacity_bytes is reached and number of blocks is capped.
buffer_->OnStreamData(kBlockSizeBytes * 1025, source_of_one_block, &written_,
&error_details_);
ASSERT_EQ(helper_->current_blocks_count(), 1024u);
}
} // anonymous namespace
} // namespace test
} // namespace quic