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361 lines
9.0 KiB
361 lines
9.0 KiB
// Copyright (c) 2011 The LevelDB Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file. See the AUTHORS file for names of contributors.
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#include "db/log_reader.h"
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#include "db/log_writer.h"
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#include "leveldb/env.h"
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#include "util/coding.h"
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#include "util/crc32c.h"
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#include "util/random.h"
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#include "util/testharness.h"
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namespace leveldb {
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namespace log {
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// Construct a string of the specified length made out of the supplied
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// partial string.
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static std::string BigString(const std::string& partial_string, size_t n) {
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std::string result;
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while (result.size() < n) {
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result.append(partial_string);
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}
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result.resize(n);
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return result;
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}
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// Construct a string from a number
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static std::string NumberString(int n) {
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char buf[50];
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snprintf(buf, sizeof(buf), "%d.", n);
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return std::string(buf);
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}
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// Return a skewed potentially long string
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static std::string RandomSkewedString(int i, Random* rnd) {
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return BigString(NumberString(i), rnd->Skewed(17));
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}
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class LogTest {
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private:
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class StringDest : public WritableFile {
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public:
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std::string contents_;
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virtual Status Close() { return Status::OK(); }
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virtual Status Flush() { return Status::OK(); }
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virtual Status Sync() { return Status::OK(); }
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virtual Status Append(const Slice& slice) {
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contents_.append(slice.data(), slice.size());
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return Status::OK();
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}
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};
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class StringSource : public SequentialFile {
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public:
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Slice contents_;
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bool force_error_;
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bool returned_partial_;
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StringSource() : force_error_(false), returned_partial_(false) { }
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virtual Status Read(size_t n, Slice* result, char* scratch) {
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ASSERT_TRUE(!returned_partial_) << "must not Read() after eof/error";
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ASSERT_EQ(kBlockSize, n);
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if (force_error_) {
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force_error_ = false;
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returned_partial_ = true;
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return Status::Corruption("read error");
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}
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if (contents_.size() < n) {
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n = contents_.size();
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returned_partial_ = true;
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}
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*result = Slice(contents_.data(), n);
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contents_.remove_prefix(n);
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return Status::OK();
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}
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};
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class ReportCollector : public Reader::Reporter {
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public:
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size_t dropped_bytes_;
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std::string message_;
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ReportCollector() : dropped_bytes_(0) { }
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virtual void Corruption(size_t bytes, const Status& status) {
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dropped_bytes_ += bytes;
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message_.append(status.ToString());
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}
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};
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StringDest dest_;
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StringSource source_;
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ReportCollector report_;
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bool reading_;
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Writer writer_;
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Reader reader_;
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public:
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LogTest() : reading_(false),
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writer_(&dest_),
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reader_(&source_, &report_, true/*checksum*/) {
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}
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void Write(const std::string& msg) {
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ASSERT_TRUE(!reading_) << "Write() after starting to read";
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writer_.AddRecord(Slice(msg));
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}
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size_t WrittenBytes() const {
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return dest_.contents_.size();
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}
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std::string Read() {
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if (!reading_) {
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reading_ = true;
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source_.contents_ = Slice(dest_.contents_);
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}
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std::string scratch;
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Slice record;
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if (reader_.ReadRecord(&record, &scratch)) {
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return record.ToString();
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} else {
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return "EOF";
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}
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}
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void IncrementByte(int offset, int delta) {
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dest_.contents_[offset] += delta;
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}
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void SetByte(int offset, char new_byte) {
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dest_.contents_[offset] = new_byte;
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}
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void ShrinkSize(int bytes) {
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dest_.contents_.resize(dest_.contents_.size() - bytes);
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}
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void FixChecksum(int header_offset, int len) {
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// Compute crc of type/len/data
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uint32_t crc = crc32c::Value(&dest_.contents_[header_offset+6], 1 + len);
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crc = crc32c::Mask(crc);
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EncodeFixed32(&dest_.contents_[header_offset], crc);
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}
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void ForceError() {
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source_.force_error_ = true;
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}
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size_t DroppedBytes() const {
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return report_.dropped_bytes_;
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}
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// Returns OK iff recorded error message contains "msg"
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std::string MatchError(const std::string& msg) const {
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if (report_.message_.find(msg) == std::string::npos) {
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return report_.message_;
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} else {
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return "OK";
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}
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}
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};
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TEST(LogTest, Empty) {
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ASSERT_EQ("EOF", Read());
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}
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TEST(LogTest, ReadWrite) {
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Write("foo");
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Write("bar");
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Write("");
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Write("xxxx");
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ASSERT_EQ("foo", Read());
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ASSERT_EQ("bar", Read());
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ASSERT_EQ("", Read());
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ASSERT_EQ("xxxx", Read());
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ASSERT_EQ("EOF", Read());
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ASSERT_EQ("EOF", Read()); // Make sure reads at eof work
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}
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TEST(LogTest, ManyBlocks) {
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for (int i = 0; i < 100000; i++) {
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Write(NumberString(i));
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}
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for (int i = 0; i < 100000; i++) {
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ASSERT_EQ(NumberString(i), Read());
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}
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ASSERT_EQ("EOF", Read());
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}
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TEST(LogTest, Fragmentation) {
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Write("small");
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Write(BigString("medium", 50000));
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Write(BigString("large", 100000));
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ASSERT_EQ("small", Read());
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ASSERT_EQ(BigString("medium", 50000), Read());
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ASSERT_EQ(BigString("large", 100000), Read());
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ASSERT_EQ("EOF", Read());
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}
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TEST(LogTest, MarginalTrailer) {
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// Make a trailer that is exactly the same length as an empty record.
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const int n = kBlockSize - 2*kHeaderSize;
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Write(BigString("foo", n));
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ASSERT_EQ(kBlockSize - kHeaderSize, WrittenBytes());
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Write("");
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Write("bar");
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ASSERT_EQ(BigString("foo", n), Read());
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ASSERT_EQ("", Read());
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ASSERT_EQ("bar", Read());
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ASSERT_EQ("EOF", Read());
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}
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TEST(LogTest, ShortTrailer) {
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const int n = kBlockSize - 2*kHeaderSize + 4;
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Write(BigString("foo", n));
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ASSERT_EQ(kBlockSize - kHeaderSize + 4, WrittenBytes());
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Write("");
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Write("bar");
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ASSERT_EQ(BigString("foo", n), Read());
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ASSERT_EQ("", Read());
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ASSERT_EQ("bar", Read());
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ASSERT_EQ("EOF", Read());
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}
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TEST(LogTest, AlignedEof) {
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const int n = kBlockSize - 2*kHeaderSize + 4;
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Write(BigString("foo", n));
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ASSERT_EQ(kBlockSize - kHeaderSize + 4, WrittenBytes());
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ASSERT_EQ(BigString("foo", n), Read());
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ASSERT_EQ("EOF", Read());
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}
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TEST(LogTest, RandomRead) {
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const int N = 500;
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Random write_rnd(301);
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for (int i = 0; i < N; i++) {
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Write(RandomSkewedString(i, &write_rnd));
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}
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Random read_rnd(301);
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for (int i = 0; i < N; i++) {
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ASSERT_EQ(RandomSkewedString(i, &read_rnd), Read());
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}
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ASSERT_EQ("EOF", Read());
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}
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// Tests of all the error paths in log_reader.cc follow:
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TEST(LogTest, ReadError) {
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Write("foo");
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ForceError();
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ASSERT_EQ("EOF", Read());
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ASSERT_EQ(kBlockSize, DroppedBytes());
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ASSERT_EQ("OK", MatchError("read error"));
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}
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TEST(LogTest, BadRecordType) {
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Write("foo");
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// Type is stored in header[6]
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IncrementByte(6, 100);
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FixChecksum(0, 3);
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ASSERT_EQ("EOF", Read());
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ASSERT_EQ(3, DroppedBytes());
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ASSERT_EQ("OK", MatchError("unknown record type"));
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}
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TEST(LogTest, TruncatedTrailingRecord) {
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Write("foo");
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ShrinkSize(4); // Drop all payload as well as a header byte
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ASSERT_EQ("EOF", Read());
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ASSERT_EQ(kHeaderSize - 1, DroppedBytes());
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ASSERT_EQ("OK", MatchError("truncated record at end of file"));
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}
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TEST(LogTest, BadLength) {
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Write("foo");
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ShrinkSize(1);
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ASSERT_EQ("EOF", Read());
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ASSERT_EQ(kHeaderSize + 2, DroppedBytes());
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ASSERT_EQ("OK", MatchError("bad record length"));
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}
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TEST(LogTest, ChecksumMismatch) {
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Write("foo");
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IncrementByte(0, 10);
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ASSERT_EQ("EOF", Read());
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ASSERT_EQ(10, DroppedBytes());
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ASSERT_EQ("OK", MatchError("checksum mismatch"));
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}
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TEST(LogTest, UnexpectedMiddleType) {
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Write("foo");
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SetByte(6, kMiddleType);
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FixChecksum(0, 3);
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ASSERT_EQ("EOF", Read());
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ASSERT_EQ(3, DroppedBytes());
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ASSERT_EQ("OK", MatchError("missing start"));
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}
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TEST(LogTest, UnexpectedLastType) {
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Write("foo");
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SetByte(6, kLastType);
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FixChecksum(0, 3);
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ASSERT_EQ("EOF", Read());
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ASSERT_EQ(3, DroppedBytes());
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ASSERT_EQ("OK", MatchError("missing start"));
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}
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TEST(LogTest, UnexpectedFullType) {
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Write("foo");
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Write("bar");
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SetByte(6, kFirstType);
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FixChecksum(0, 3);
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ASSERT_EQ("bar", Read());
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ASSERT_EQ("EOF", Read());
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ASSERT_EQ(3, DroppedBytes());
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ASSERT_EQ("OK", MatchError("partial record without end"));
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}
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TEST(LogTest, UnexpectedFirstType) {
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Write("foo");
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Write(BigString("bar", 100000));
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SetByte(6, kFirstType);
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FixChecksum(0, 3);
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ASSERT_EQ(BigString("bar", 100000), Read());
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ASSERT_EQ("EOF", Read());
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ASSERT_EQ(3, DroppedBytes());
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ASSERT_EQ("OK", MatchError("partial record without end"));
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}
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TEST(LogTest, ErrorJoinsRecords) {
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// Consider two fragmented records:
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// first(R1) last(R1) first(R2) last(R2)
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// where the middle two fragments disappear. We do not want
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// first(R1),last(R2) to get joined and returned as a valid record.
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// Write records that span two blocks
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Write(BigString("foo", kBlockSize));
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Write(BigString("bar", kBlockSize));
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Write("correct");
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// Wipe the middle block
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for (int offset = kBlockSize; offset < 2*kBlockSize; offset++) {
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SetByte(offset, 'x');
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}
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ASSERT_EQ("correct", Read());
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ASSERT_EQ("EOF", Read());
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const int dropped = DroppedBytes();
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ASSERT_LE(dropped, 2*kBlockSize + 100);
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ASSERT_GE(dropped, 2*kBlockSize);
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}
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}
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}
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int main(int argc, char** argv) {
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return leveldb::test::RunAllTests();
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}
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