25개 이상의 토픽을 선택하실 수 없습니다.
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
548 lines
14 KiB
548 lines
14 KiB
// Copyright (c) 2011 The LevelDB Authors. All rights reserved.
|
|
// Use of this source code is governed by a BSD-style license that can be
|
|
// found in the LICENSE file. See the AUTHORS file for names of contributors.
|
|
|
|
#include "db/log_reader.h"
|
|
#include "db/log_writer.h"
|
|
#include "leveldb/env.h"
|
|
#include "util/coding.h"
|
|
#include "util/crc32c.h"
|
|
#include "util/random.h"
|
|
#include "util/testharness.h"
|
|
|
|
namespace leveldb {
|
|
namespace log {
|
|
|
|
// Construct a string of the specified length made out of the supplied
|
|
// partial string.
|
|
static std::string BigString(const std::string& partial_string, size_t n) {
|
|
std::string result;
|
|
while (result.size() < n) {
|
|
result.append(partial_string);
|
|
}
|
|
result.resize(n);
|
|
return result;
|
|
}
|
|
|
|
// Construct a string from a number
|
|
static std::string NumberString(int n) {
|
|
char buf[50];
|
|
snprintf(buf, sizeof(buf), "%d.", n);
|
|
return std::string(buf);
|
|
}
|
|
|
|
// Return a skewed potentially long string
|
|
static std::string RandomSkewedString(int i, Random* rnd) {
|
|
return BigString(NumberString(i), rnd->Skewed(17));
|
|
}
|
|
|
|
class LogTest {
|
|
private:
|
|
class StringDest : public WritableFile {
|
|
public:
|
|
std::string contents_;
|
|
|
|
virtual Status Close() { return Status::OK(); }
|
|
virtual Status Flush() { return Status::OK(); }
|
|
virtual Status Sync() { return Status::OK(); }
|
|
virtual Status Append(const Slice& slice) {
|
|
contents_.append(slice.data(), slice.size());
|
|
return Status::OK();
|
|
}
|
|
};
|
|
|
|
class StringSource : public SequentialFile {
|
|
public:
|
|
Slice contents_;
|
|
bool force_error_;
|
|
bool returned_partial_;
|
|
StringSource() : force_error_(false), returned_partial_(false) { }
|
|
|
|
virtual Status Read(size_t n, Slice* result, char* scratch) {
|
|
ASSERT_TRUE(!returned_partial_) << "must not Read() after eof/error";
|
|
|
|
if (force_error_) {
|
|
force_error_ = false;
|
|
returned_partial_ = true;
|
|
return Status::Corruption("read error");
|
|
}
|
|
|
|
if (contents_.size() < n) {
|
|
n = contents_.size();
|
|
returned_partial_ = true;
|
|
}
|
|
*result = Slice(contents_.data(), n);
|
|
contents_.remove_prefix(n);
|
|
return Status::OK();
|
|
}
|
|
|
|
virtual Status Skip(uint64_t n) {
|
|
if (n > contents_.size()) {
|
|
contents_.clear();
|
|
return Status::NotFound("in-memory file skipepd past end");
|
|
}
|
|
|
|
contents_.remove_prefix(n);
|
|
|
|
return Status::OK();
|
|
}
|
|
};
|
|
|
|
class ReportCollector : public Reader::Reporter {
|
|
public:
|
|
size_t dropped_bytes_;
|
|
std::string message_;
|
|
|
|
ReportCollector() : dropped_bytes_(0) { }
|
|
virtual void Corruption(size_t bytes, const Status& status) {
|
|
dropped_bytes_ += bytes;
|
|
message_.append(status.ToString());
|
|
}
|
|
};
|
|
|
|
StringDest dest_;
|
|
StringSource source_;
|
|
ReportCollector report_;
|
|
bool reading_;
|
|
Writer* writer_;
|
|
Reader reader_;
|
|
|
|
// Record metadata for testing initial offset functionality
|
|
static size_t initial_offset_record_sizes_[];
|
|
static uint64_t initial_offset_last_record_offsets_[];
|
|
|
|
public:
|
|
LogTest() : reading_(false),
|
|
writer_(new Writer(&dest_)),
|
|
reader_(&source_, &report_, true/*checksum*/,
|
|
0/*initial_offset*/) {
|
|
}
|
|
|
|
~LogTest() {
|
|
delete writer_;
|
|
}
|
|
|
|
void ReopenForAppend() {
|
|
delete writer_;
|
|
writer_ = new Writer(&dest_, dest_.contents_.size());
|
|
}
|
|
|
|
void Write(const std::string& msg) {
|
|
ASSERT_TRUE(!reading_) << "Write() after starting to read";
|
|
writer_->AddRecord(Slice(msg));
|
|
}
|
|
|
|
size_t WrittenBytes() const {
|
|
return dest_.contents_.size();
|
|
}
|
|
|
|
std::string Read() {
|
|
if (!reading_) {
|
|
reading_ = true;
|
|
source_.contents_ = Slice(dest_.contents_);
|
|
}
|
|
std::string scratch;
|
|
Slice record;
|
|
if (reader_.ReadRecord(&record, &scratch)) {
|
|
return record.ToString();
|
|
} else {
|
|
return "EOF";
|
|
}
|
|
}
|
|
|
|
void IncrementByte(int offset, int delta) {
|
|
dest_.contents_[offset] += delta;
|
|
}
|
|
|
|
void SetByte(int offset, char new_byte) {
|
|
dest_.contents_[offset] = new_byte;
|
|
}
|
|
|
|
void ShrinkSize(int bytes) {
|
|
dest_.contents_.resize(dest_.contents_.size() - bytes);
|
|
}
|
|
|
|
void FixChecksum(int header_offset, int len) {
|
|
// Compute crc of type/len/data
|
|
uint32_t crc = crc32c::Value(&dest_.contents_[header_offset+6], 1 + len);
|
|
crc = crc32c::Mask(crc);
|
|
EncodeFixed32(&dest_.contents_[header_offset], crc);
|
|
}
|
|
|
|
void ForceError() {
|
|
source_.force_error_ = true;
|
|
}
|
|
|
|
size_t DroppedBytes() const {
|
|
return report_.dropped_bytes_;
|
|
}
|
|
|
|
std::string ReportMessage() const {
|
|
return report_.message_;
|
|
}
|
|
|
|
// Returns OK iff recorded error message contains "msg"
|
|
std::string MatchError(const std::string& msg) const {
|
|
if (report_.message_.find(msg) == std::string::npos) {
|
|
return report_.message_;
|
|
} else {
|
|
return "OK";
|
|
}
|
|
}
|
|
|
|
void WriteInitialOffsetLog() {
|
|
for (int i = 0; i < 4; i++) {
|
|
std::string record(initial_offset_record_sizes_[i],
|
|
static_cast<char>('a' + i));
|
|
Write(record);
|
|
}
|
|
}
|
|
|
|
void CheckOffsetPastEndReturnsNoRecords(uint64_t offset_past_end) {
|
|
WriteInitialOffsetLog();
|
|
reading_ = true;
|
|
source_.contents_ = Slice(dest_.contents_);
|
|
Reader* offset_reader = new Reader(&source_, &report_, true/*checksum*/,
|
|
WrittenBytes() + offset_past_end);
|
|
Slice record;
|
|
std::string scratch;
|
|
ASSERT_TRUE(!offset_reader->ReadRecord(&record, &scratch));
|
|
delete offset_reader;
|
|
}
|
|
|
|
void CheckInitialOffsetRecord(uint64_t initial_offset,
|
|
int expected_record_offset) {
|
|
WriteInitialOffsetLog();
|
|
reading_ = true;
|
|
source_.contents_ = Slice(dest_.contents_);
|
|
Reader* offset_reader = new Reader(&source_, &report_, true/*checksum*/,
|
|
initial_offset);
|
|
Slice record;
|
|
std::string scratch;
|
|
ASSERT_TRUE(offset_reader->ReadRecord(&record, &scratch));
|
|
ASSERT_EQ(initial_offset_record_sizes_[expected_record_offset],
|
|
record.size());
|
|
ASSERT_EQ(initial_offset_last_record_offsets_[expected_record_offset],
|
|
offset_reader->LastRecordOffset());
|
|
ASSERT_EQ((char)('a' + expected_record_offset), record.data()[0]);
|
|
delete offset_reader;
|
|
}
|
|
|
|
};
|
|
|
|
size_t LogTest::initial_offset_record_sizes_[] =
|
|
{10000, // Two sizable records in first block
|
|
10000,
|
|
2 * log::kBlockSize - 1000, // Span three blocks
|
|
1};
|
|
|
|
uint64_t LogTest::initial_offset_last_record_offsets_[] =
|
|
{0,
|
|
kHeaderSize + 10000,
|
|
2 * (kHeaderSize + 10000),
|
|
2 * (kHeaderSize + 10000) +
|
|
(2 * log::kBlockSize - 1000) + 3 * kHeaderSize};
|
|
|
|
|
|
TEST(LogTest, Empty) {
|
|
ASSERT_EQ("EOF", Read());
|
|
}
|
|
|
|
TEST(LogTest, ReadWrite) {
|
|
Write("foo");
|
|
Write("bar");
|
|
Write("");
|
|
Write("xxxx");
|
|
ASSERT_EQ("foo", Read());
|
|
ASSERT_EQ("bar", Read());
|
|
ASSERT_EQ("", Read());
|
|
ASSERT_EQ("xxxx", Read());
|
|
ASSERT_EQ("EOF", Read());
|
|
ASSERT_EQ("EOF", Read()); // Make sure reads at eof work
|
|
}
|
|
|
|
TEST(LogTest, ManyBlocks) {
|
|
for (int i = 0; i < 100000; i++) {
|
|
Write(NumberString(i));
|
|
}
|
|
for (int i = 0; i < 100000; i++) {
|
|
ASSERT_EQ(NumberString(i), Read());
|
|
}
|
|
ASSERT_EQ("EOF", Read());
|
|
}
|
|
|
|
TEST(LogTest, Fragmentation) {
|
|
Write("small");
|
|
Write(BigString("medium", 50000));
|
|
Write(BigString("large", 100000));
|
|
ASSERT_EQ("small", Read());
|
|
ASSERT_EQ(BigString("medium", 50000), Read());
|
|
ASSERT_EQ(BigString("large", 100000), Read());
|
|
ASSERT_EQ("EOF", Read());
|
|
}
|
|
|
|
TEST(LogTest, MarginalTrailer) {
|
|
// Make a trailer that is exactly the same length as an empty record.
|
|
const int n = kBlockSize - 2*kHeaderSize;
|
|
Write(BigString("foo", n));
|
|
ASSERT_EQ(kBlockSize - kHeaderSize, WrittenBytes());
|
|
Write("");
|
|
Write("bar");
|
|
ASSERT_EQ(BigString("foo", n), Read());
|
|
ASSERT_EQ("", Read());
|
|
ASSERT_EQ("bar", Read());
|
|
ASSERT_EQ("EOF", Read());
|
|
}
|
|
|
|
TEST(LogTest, MarginalTrailer2) {
|
|
// Make a trailer that is exactly the same length as an empty record.
|
|
const int n = kBlockSize - 2*kHeaderSize;
|
|
Write(BigString("foo", n));
|
|
ASSERT_EQ(kBlockSize - kHeaderSize, WrittenBytes());
|
|
Write("bar");
|
|
ASSERT_EQ(BigString("foo", n), Read());
|
|
ASSERT_EQ("bar", Read());
|
|
ASSERT_EQ("EOF", Read());
|
|
ASSERT_EQ(0, DroppedBytes());
|
|
ASSERT_EQ("", ReportMessage());
|
|
}
|
|
|
|
TEST(LogTest, ShortTrailer) {
|
|
const int n = kBlockSize - 2*kHeaderSize + 4;
|
|
Write(BigString("foo", n));
|
|
ASSERT_EQ(kBlockSize - kHeaderSize + 4, WrittenBytes());
|
|
Write("");
|
|
Write("bar");
|
|
ASSERT_EQ(BigString("foo", n), Read());
|
|
ASSERT_EQ("", Read());
|
|
ASSERT_EQ("bar", Read());
|
|
ASSERT_EQ("EOF", Read());
|
|
}
|
|
|
|
TEST(LogTest, AlignedEof) {
|
|
const int n = kBlockSize - 2*kHeaderSize + 4;
|
|
Write(BigString("foo", n));
|
|
ASSERT_EQ(kBlockSize - kHeaderSize + 4, WrittenBytes());
|
|
ASSERT_EQ(BigString("foo", n), Read());
|
|
ASSERT_EQ("EOF", Read());
|
|
}
|
|
|
|
TEST(LogTest, OpenForAppend) {
|
|
Write("hello");
|
|
ReopenForAppend();
|
|
Write("world");
|
|
ASSERT_EQ("hello", Read());
|
|
ASSERT_EQ("world", Read());
|
|
ASSERT_EQ("EOF", Read());
|
|
}
|
|
|
|
TEST(LogTest, RandomRead) {
|
|
const int N = 500;
|
|
Random write_rnd(301);
|
|
for (int i = 0; i < N; i++) {
|
|
Write(RandomSkewedString(i, &write_rnd));
|
|
}
|
|
Random read_rnd(301);
|
|
for (int i = 0; i < N; i++) {
|
|
ASSERT_EQ(RandomSkewedString(i, &read_rnd), Read());
|
|
}
|
|
ASSERT_EQ("EOF", Read());
|
|
}
|
|
|
|
// Tests of all the error paths in log_reader.cc follow:
|
|
|
|
TEST(LogTest, ReadError) {
|
|
Write("foo");
|
|
ForceError();
|
|
ASSERT_EQ("EOF", Read());
|
|
ASSERT_EQ(kBlockSize, DroppedBytes());
|
|
ASSERT_EQ("OK", MatchError("read error"));
|
|
}
|
|
|
|
TEST(LogTest, BadRecordType) {
|
|
Write("foo");
|
|
// Type is stored in header[6]
|
|
IncrementByte(6, 100);
|
|
FixChecksum(0, 3);
|
|
ASSERT_EQ("EOF", Read());
|
|
ASSERT_EQ(3, DroppedBytes());
|
|
ASSERT_EQ("OK", MatchError("unknown record type"));
|
|
}
|
|
|
|
TEST(LogTest, TruncatedTrailingRecordIsIgnored) {
|
|
Write("foo");
|
|
ShrinkSize(4); // Drop all payload as well as a header byte
|
|
ASSERT_EQ("EOF", Read());
|
|
// Truncated last record is ignored, not treated as an error.
|
|
ASSERT_EQ(0, DroppedBytes());
|
|
ASSERT_EQ("", ReportMessage());
|
|
}
|
|
|
|
TEST(LogTest, BadLength) {
|
|
const int kPayloadSize = kBlockSize - kHeaderSize;
|
|
Write(BigString("bar", kPayloadSize));
|
|
Write("foo");
|
|
// Least significant size byte is stored in header[4].
|
|
IncrementByte(4, 1);
|
|
ASSERT_EQ("foo", Read());
|
|
ASSERT_EQ(kBlockSize, DroppedBytes());
|
|
ASSERT_EQ("OK", MatchError("bad record length"));
|
|
}
|
|
|
|
TEST(LogTest, BadLengthAtEndIsIgnored) {
|
|
Write("foo");
|
|
ShrinkSize(1);
|
|
ASSERT_EQ("EOF", Read());
|
|
ASSERT_EQ(0, DroppedBytes());
|
|
ASSERT_EQ("", ReportMessage());
|
|
}
|
|
|
|
TEST(LogTest, ChecksumMismatch) {
|
|
Write("foo");
|
|
IncrementByte(0, 10);
|
|
ASSERT_EQ("EOF", Read());
|
|
ASSERT_EQ(10, DroppedBytes());
|
|
ASSERT_EQ("OK", MatchError("checksum mismatch"));
|
|
}
|
|
|
|
TEST(LogTest, UnexpectedMiddleType) {
|
|
Write("foo");
|
|
SetByte(6, kMiddleType);
|
|
FixChecksum(0, 3);
|
|
ASSERT_EQ("EOF", Read());
|
|
ASSERT_EQ(3, DroppedBytes());
|
|
ASSERT_EQ("OK", MatchError("missing start"));
|
|
}
|
|
|
|
TEST(LogTest, UnexpectedLastType) {
|
|
Write("foo");
|
|
SetByte(6, kLastType);
|
|
FixChecksum(0, 3);
|
|
ASSERT_EQ("EOF", Read());
|
|
ASSERT_EQ(3, DroppedBytes());
|
|
ASSERT_EQ("OK", MatchError("missing start"));
|
|
}
|
|
|
|
TEST(LogTest, UnexpectedFullType) {
|
|
Write("foo");
|
|
Write("bar");
|
|
SetByte(6, kFirstType);
|
|
FixChecksum(0, 3);
|
|
ASSERT_EQ("bar", Read());
|
|
ASSERT_EQ("EOF", Read());
|
|
ASSERT_EQ(3, DroppedBytes());
|
|
ASSERT_EQ("OK", MatchError("partial record without end"));
|
|
}
|
|
|
|
TEST(LogTest, UnexpectedFirstType) {
|
|
Write("foo");
|
|
Write(BigString("bar", 100000));
|
|
SetByte(6, kFirstType);
|
|
FixChecksum(0, 3);
|
|
ASSERT_EQ(BigString("bar", 100000), Read());
|
|
ASSERT_EQ("EOF", Read());
|
|
ASSERT_EQ(3, DroppedBytes());
|
|
ASSERT_EQ("OK", MatchError("partial record without end"));
|
|
}
|
|
|
|
TEST(LogTest, MissingLastIsIgnored) {
|
|
Write(BigString("bar", kBlockSize));
|
|
// Remove the LAST block, including header.
|
|
ShrinkSize(14);
|
|
ASSERT_EQ("EOF", Read());
|
|
ASSERT_EQ("", ReportMessage());
|
|
ASSERT_EQ(0, DroppedBytes());
|
|
}
|
|
|
|
TEST(LogTest, PartialLastIsIgnored) {
|
|
Write(BigString("bar", kBlockSize));
|
|
// Cause a bad record length in the LAST block.
|
|
ShrinkSize(1);
|
|
ASSERT_EQ("EOF", Read());
|
|
ASSERT_EQ("", ReportMessage());
|
|
ASSERT_EQ(0, DroppedBytes());
|
|
}
|
|
|
|
TEST(LogTest, ErrorJoinsRecords) {
|
|
// Consider two fragmented records:
|
|
// first(R1) last(R1) first(R2) last(R2)
|
|
// where the middle two fragments disappear. We do not want
|
|
// first(R1),last(R2) to get joined and returned as a valid record.
|
|
|
|
// Write records that span two blocks
|
|
Write(BigString("foo", kBlockSize));
|
|
Write(BigString("bar", kBlockSize));
|
|
Write("correct");
|
|
|
|
// Wipe the middle block
|
|
for (int offset = kBlockSize; offset < 2*kBlockSize; offset++) {
|
|
SetByte(offset, 'x');
|
|
}
|
|
|
|
ASSERT_EQ("correct", Read());
|
|
ASSERT_EQ("EOF", Read());
|
|
const size_t dropped = DroppedBytes();
|
|
ASSERT_LE(dropped, 2*kBlockSize + 100);
|
|
ASSERT_GE(dropped, 2*kBlockSize);
|
|
}
|
|
|
|
TEST(LogTest, ReadStart) {
|
|
CheckInitialOffsetRecord(0, 0);
|
|
}
|
|
|
|
TEST(LogTest, ReadSecondOneOff) {
|
|
CheckInitialOffsetRecord(1, 1);
|
|
}
|
|
|
|
TEST(LogTest, ReadSecondTenThousand) {
|
|
CheckInitialOffsetRecord(10000, 1);
|
|
}
|
|
|
|
TEST(LogTest, ReadSecondStart) {
|
|
CheckInitialOffsetRecord(10007, 1);
|
|
}
|
|
|
|
TEST(LogTest, ReadThirdOneOff) {
|
|
CheckInitialOffsetRecord(10008, 2);
|
|
}
|
|
|
|
TEST(LogTest, ReadThirdStart) {
|
|
CheckInitialOffsetRecord(20014, 2);
|
|
}
|
|
|
|
TEST(LogTest, ReadFourthOneOff) {
|
|
CheckInitialOffsetRecord(20015, 3);
|
|
}
|
|
|
|
TEST(LogTest, ReadFourthFirstBlockTrailer) {
|
|
CheckInitialOffsetRecord(log::kBlockSize - 4, 3);
|
|
}
|
|
|
|
TEST(LogTest, ReadFourthMiddleBlock) {
|
|
CheckInitialOffsetRecord(log::kBlockSize + 1, 3);
|
|
}
|
|
|
|
TEST(LogTest, ReadFourthLastBlock) {
|
|
CheckInitialOffsetRecord(2 * log::kBlockSize + 1, 3);
|
|
}
|
|
|
|
TEST(LogTest, ReadFourthStart) {
|
|
CheckInitialOffsetRecord(
|
|
2 * (kHeaderSize + 1000) + (2 * log::kBlockSize - 1000) + 3 * kHeaderSize,
|
|
3);
|
|
}
|
|
|
|
TEST(LogTest, ReadEnd) {
|
|
CheckOffsetPastEndReturnsNoRecords(0);
|
|
}
|
|
|
|
TEST(LogTest, ReadPastEnd) {
|
|
CheckOffsetPastEndReturnsNoRecords(5);
|
|
}
|
|
|
|
} // namespace log
|
|
} // namespace leveldb
|
|
|
|
int main(int argc, char** argv) {
|
|
return leveldb::test::RunAllTests();
|
|
}
|