rocksdb/test_util/testutil.h
mrambacher 6ad0810393 Make Comparator into a Customizable Object (#8336)
Summary:
Makes the Comparator class into a Customizable object.  Added/Updated the CreateFromString method to create Comparators.  Added test for using the ObjectRegistry to create one.

Pull Request resolved: https://github.com/facebook/rocksdb/pull/8336

Reviewed By: jay-zhuang

Differential Revision: D28999612

Pulled By: mrambacher

fbshipit-source-id: bff2cb2814eeb9fef6a00fddc61d6e34b6fbcf2e
2021-06-11 06:22:59 -07:00

870 lines
28 KiB
C++

// Copyright (c) 2011-present, Facebook, Inc. All rights reserved.
// This source code is licensed under both the GPLv2 (found in the
// COPYING file in the root directory) and Apache 2.0 License
// (found in the LICENSE.Apache file in the root directory).
//
// 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.
#pragma once
#include <algorithm>
#include <deque>
#include <string>
#include <vector>
#include "env/composite_env_wrapper.h"
#include "file/writable_file_writer.h"
#include "rocksdb/compaction_filter.h"
#include "rocksdb/env.h"
#include "rocksdb/iterator.h"
#include "rocksdb/merge_operator.h"
#include "rocksdb/options.h"
#include "rocksdb/slice.h"
#include "rocksdb/table.h"
#include "table/internal_iterator.h"
#include "util/mutexlock.h"
namespace ROCKSDB_NAMESPACE {
class FileSystem;
class Random;
class SequentialFile;
class SequentialFileReader;
namespace test {
extern const uint32_t kDefaultFormatVersion;
extern const uint32_t kLatestFormatVersion;
// Return a random key with the specified length that may contain interesting
// characters (e.g. \x00, \xff, etc.).
enum RandomKeyType : char { RANDOM, LARGEST, SMALLEST, MIDDLE };
extern std::string RandomKey(Random* rnd, int len,
RandomKeyType type = RandomKeyType::RANDOM);
// Store in *dst a string of length "len" that will compress to
// "N*compressed_fraction" bytes and return a Slice that references
// the generated data.
extern Slice CompressibleString(Random* rnd, double compressed_fraction,
int len, std::string* dst);
// A wrapper that allows injection of errors.
class ErrorEnv : public EnvWrapper {
public:
bool writable_file_error_;
int num_writable_file_errors_;
ErrorEnv(Env* _target)
: EnvWrapper(_target),
writable_file_error_(false),
num_writable_file_errors_(0) {}
virtual Status NewWritableFile(const std::string& fname,
std::unique_ptr<WritableFile>* result,
const EnvOptions& soptions) override {
result->reset();
if (writable_file_error_) {
++num_writable_file_errors_;
return Status::IOError(fname, "fake error");
}
return target()->NewWritableFile(fname, result, soptions);
}
};
#ifndef NDEBUG
// An internal comparator that just forward comparing results from the
// user comparator in it. Can be used to test entities that have no dependency
// on internal key structure but consumes InternalKeyComparator, like
// BlockBasedTable.
class PlainInternalKeyComparator : public InternalKeyComparator {
public:
explicit PlainInternalKeyComparator(const Comparator* c)
: InternalKeyComparator(c) {}
virtual ~PlainInternalKeyComparator() {}
virtual int Compare(const Slice& a, const Slice& b) const override {
return user_comparator()->Compare(a, b);
}
};
#endif
// A test comparator which compare two strings in this way:
// (1) first compare prefix of 8 bytes in alphabet order,
// (2) if two strings share the same prefix, sort the other part of the string
// in the reverse alphabet order.
// This helps simulate the case of compounded key of [entity][timestamp] and
// latest timestamp first.
class SimpleSuffixReverseComparator : public Comparator {
public:
SimpleSuffixReverseComparator() {}
static const char* kClassName() { return "SimpleSuffixReverseComparator"; }
virtual const char* Name() const override { return kClassName(); }
virtual int Compare(const Slice& a, const Slice& b) const override {
Slice prefix_a = Slice(a.data(), 8);
Slice prefix_b = Slice(b.data(), 8);
int prefix_comp = prefix_a.compare(prefix_b);
if (prefix_comp != 0) {
return prefix_comp;
} else {
Slice suffix_a = Slice(a.data() + 8, a.size() - 8);
Slice suffix_b = Slice(b.data() + 8, b.size() - 8);
return -(suffix_a.compare(suffix_b));
}
}
virtual void FindShortestSeparator(std::string* /*start*/,
const Slice& /*limit*/) const override {}
virtual void FindShortSuccessor(std::string* /*key*/) const override {}
};
// Returns a user key comparator that can be used for comparing two uint64_t
// slices. Instead of comparing slices byte-wise, it compares all the 8 bytes
// at once. Assumes same endian-ness is used though the database's lifetime.
// Symantics of comparison would differ from Bytewise comparator in little
// endian machines.
extern const Comparator* Uint64Comparator();
// Iterator over a vector of keys/values
class VectorIterator : public InternalIterator {
public:
explicit VectorIterator(const std::vector<std::string>& keys)
: keys_(keys), current_(keys.size()) {
std::sort(keys_.begin(), keys_.end());
values_.resize(keys.size());
}
VectorIterator(const std::vector<std::string>& keys,
const std::vector<std::string>& values)
: keys_(keys), values_(values), current_(keys.size()) {
assert(keys_.size() == values_.size());
}
virtual bool Valid() const override { return current_ < keys_.size(); }
virtual void SeekToFirst() override { current_ = 0; }
virtual void SeekToLast() override { current_ = keys_.size() - 1; }
virtual void Seek(const Slice& target) override {
current_ = std::lower_bound(keys_.begin(), keys_.end(), target.ToString()) -
keys_.begin();
}
virtual void SeekForPrev(const Slice& target) override {
current_ = std::upper_bound(keys_.begin(), keys_.end(), target.ToString()) -
keys_.begin();
if (!Valid()) {
SeekToLast();
} else {
Prev();
}
}
virtual void Next() override { current_++; }
virtual void Prev() override { current_--; }
virtual Slice key() const override { return Slice(keys_[current_]); }
virtual Slice value() const override { return Slice(values_[current_]); }
virtual Status status() const override { return Status::OK(); }
virtual bool IsKeyPinned() const override { return true; }
virtual bool IsValuePinned() const override { return true; }
private:
std::vector<std::string> keys_;
std::vector<std::string> values_;
size_t current_;
};
class StringSink : public FSWritableFile {
public:
std::string contents_;
explicit StringSink(Slice* reader_contents = nullptr)
: FSWritableFile(),
contents_(""),
reader_contents_(reader_contents),
last_flush_(0) {
if (reader_contents_ != nullptr) {
*reader_contents_ = Slice(contents_.data(), 0);
}
}
const std::string& contents() const { return contents_; }
IOStatus Truncate(uint64_t size, const IOOptions& /*opts*/,
IODebugContext* /*dbg*/) override {
contents_.resize(static_cast<size_t>(size));
return IOStatus::OK();
}
IOStatus Close(const IOOptions& /*opts*/, IODebugContext* /*dbg*/) override {
return IOStatus::OK();
}
IOStatus Flush(const IOOptions& /*opts*/, IODebugContext* /*dbg*/) override {
if (reader_contents_ != nullptr) {
assert(reader_contents_->size() <= last_flush_);
size_t offset = last_flush_ - reader_contents_->size();
*reader_contents_ = Slice(
contents_.data() + offset,
contents_.size() - offset);
last_flush_ = contents_.size();
}
return IOStatus::OK();
}
IOStatus Sync(const IOOptions& /*opts*/, IODebugContext* /*dbg*/) override {
return IOStatus::OK();
}
using FSWritableFile::Append;
IOStatus Append(const Slice& slice, const IOOptions& /*opts*/,
IODebugContext* /*dbg*/) override {
contents_.append(slice.data(), slice.size());
return IOStatus::OK();
}
void Drop(size_t bytes) {
if (reader_contents_ != nullptr) {
contents_.resize(contents_.size() - bytes);
*reader_contents_ = Slice(
reader_contents_->data(), reader_contents_->size() - bytes);
last_flush_ = contents_.size();
}
}
private:
Slice* reader_contents_;
size_t last_flush_;
};
// A wrapper around a StringSink to give it a RandomRWFile interface
class RandomRWStringSink : public FSRandomRWFile {
public:
explicit RandomRWStringSink(StringSink* ss) : ss_(ss) {}
IOStatus Write(uint64_t offset, const Slice& data, const IOOptions& /*opts*/,
IODebugContext* /*dbg*/) override {
if (offset + data.size() > ss_->contents_.size()) {
ss_->contents_.resize(static_cast<size_t>(offset) + data.size(), '\0');
}
char* pos = const_cast<char*>(ss_->contents_.data() + offset);
memcpy(pos, data.data(), data.size());
return IOStatus::OK();
}
IOStatus Read(uint64_t offset, size_t n, const IOOptions& /*opts*/,
Slice* result, char* /*scratch*/,
IODebugContext* /*dbg*/) const override {
*result = Slice(nullptr, 0);
if (offset < ss_->contents_.size()) {
size_t str_res_sz =
std::min(static_cast<size_t>(ss_->contents_.size() - offset), n);
*result = Slice(ss_->contents_.data() + offset, str_res_sz);
}
return IOStatus::OK();
}
IOStatus Flush(const IOOptions& /*opts*/, IODebugContext* /*dbg*/) override {
return IOStatus::OK();
}
IOStatus Sync(const IOOptions& /*opts*/, IODebugContext* /*dbg*/) override {
return IOStatus::OK();
}
IOStatus Close(const IOOptions& /*opts*/, IODebugContext* /*dbg*/) override {
return IOStatus::OK();
}
const std::string& contents() const { return ss_->contents(); }
private:
StringSink* ss_;
};
// Like StringSink, this writes into a string. Unlink StringSink, it
// has some initial content and overwrites it, just like a recycled
// log file.
class OverwritingStringSink : public FSWritableFile {
public:
explicit OverwritingStringSink(Slice* reader_contents)
: FSWritableFile(),
contents_(""),
reader_contents_(reader_contents),
last_flush_(0) {}
const std::string& contents() const { return contents_; }
IOStatus Truncate(uint64_t size, const IOOptions& /*opts*/,
IODebugContext* /*dbg*/) override {
contents_.resize(static_cast<size_t>(size));
return IOStatus::OK();
}
IOStatus Close(const IOOptions& /*opts*/, IODebugContext* /*dbg*/) override {
return IOStatus::OK();
}
IOStatus Flush(const IOOptions& /*opts*/, IODebugContext* /*dbg*/) override {
if (last_flush_ < contents_.size()) {
assert(reader_contents_->size() >= contents_.size());
memcpy((char*)reader_contents_->data() + last_flush_,
contents_.data() + last_flush_, contents_.size() - last_flush_);
last_flush_ = contents_.size();
}
return IOStatus::OK();
}
IOStatus Sync(const IOOptions& /*opts*/, IODebugContext* /*dbg*/) override {
return IOStatus::OK();
}
using FSWritableFile::Append;
IOStatus Append(const Slice& slice, const IOOptions& /*opts*/,
IODebugContext* /*dbg*/) override {
contents_.append(slice.data(), slice.size());
return IOStatus::OK();
}
void Drop(size_t bytes) {
contents_.resize(contents_.size() - bytes);
if (last_flush_ > contents_.size()) last_flush_ = contents_.size();
}
private:
std::string contents_;
Slice* reader_contents_;
size_t last_flush_;
};
class StringSource : public FSRandomAccessFile {
public:
explicit StringSource(const Slice& contents, uint64_t uniq_id = 0,
bool mmap = false)
: contents_(contents.data(), contents.size()),
uniq_id_(uniq_id),
mmap_(mmap),
total_reads_(0) {}
virtual ~StringSource() { }
uint64_t Size() const { return contents_.size(); }
IOStatus Prefetch(uint64_t /*offset*/, size_t /*n*/,
const IOOptions& /*options*/,
IODebugContext* /*dbg*/) override {
// If we are using mmap_, it is equivalent to performing a prefetch
if (mmap_) {
return IOStatus::OK();
} else {
return IOStatus::NotSupported("Prefetch not supported");
}
}
IOStatus Read(uint64_t offset, size_t n, const IOOptions& /*opts*/,
Slice* result, char* scratch,
IODebugContext* /*dbg*/) const override {
total_reads_++;
if (offset > contents_.size()) {
return IOStatus::InvalidArgument("invalid Read offset");
}
if (offset + n > contents_.size()) {
n = contents_.size() - static_cast<size_t>(offset);
}
if (!mmap_) {
memcpy(scratch, &contents_[static_cast<size_t>(offset)], n);
*result = Slice(scratch, n);
} else {
*result = Slice(&contents_[static_cast<size_t>(offset)], n);
}
return IOStatus::OK();
}
size_t GetUniqueId(char* id, size_t max_size) const override {
if (max_size < 20) {
return 0;
}
char* rid = id;
rid = EncodeVarint64(rid, uniq_id_);
rid = EncodeVarint64(rid, 0);
return static_cast<size_t>(rid-id);
}
int total_reads() const { return total_reads_; }
void set_total_reads(int tr) { total_reads_ = tr; }
private:
std::string contents_;
uint64_t uniq_id_;
bool mmap_;
mutable int total_reads_;
};
class NullLogger : public Logger {
public:
using Logger::Logv;
virtual void Logv(const char* /*format*/, va_list /*ap*/) override {}
virtual size_t GetLogFileSize() const override { return 0; }
};
// Corrupts key by changing the type
extern void CorruptKeyType(InternalKey* ikey);
extern std::string KeyStr(const std::string& user_key,
const SequenceNumber& seq, const ValueType& t,
bool corrupt = false);
extern std::string KeyStr(uint64_t ts, const std::string& user_key,
const SequenceNumber& seq, const ValueType& t,
bool corrupt = false);
class SleepingBackgroundTask {
public:
SleepingBackgroundTask()
: bg_cv_(&mutex_),
should_sleep_(true),
done_with_sleep_(false),
sleeping_(false) {}
bool IsSleeping() {
MutexLock l(&mutex_);
return sleeping_;
}
void DoSleep() {
MutexLock l(&mutex_);
sleeping_ = true;
bg_cv_.SignalAll();
while (should_sleep_) {
bg_cv_.Wait();
}
sleeping_ = false;
done_with_sleep_ = true;
bg_cv_.SignalAll();
}
void WaitUntilSleeping() {
MutexLock l(&mutex_);
while (!sleeping_ || !should_sleep_) {
bg_cv_.Wait();
}
}
// Waits for the status to change to sleeping,
// otherwise times out.
// wait_time is in microseconds.
// Returns true when times out, false otherwise.
bool TimedWaitUntilSleeping(uint64_t wait_time);
void WakeUp() {
MutexLock l(&mutex_);
should_sleep_ = false;
bg_cv_.SignalAll();
}
void WaitUntilDone() {
MutexLock l(&mutex_);
while (!done_with_sleep_) {
bg_cv_.Wait();
}
}
// Similar to TimedWaitUntilSleeping.
// Waits until the task is done.
bool TimedWaitUntilDone(uint64_t wait_time);
bool WokenUp() {
MutexLock l(&mutex_);
return should_sleep_ == false;
}
void Reset() {
MutexLock l(&mutex_);
should_sleep_ = true;
done_with_sleep_ = false;
}
static void DoSleepTask(void* arg) {
reinterpret_cast<SleepingBackgroundTask*>(arg)->DoSleep();
}
private:
port::Mutex mutex_;
port::CondVar bg_cv_; // Signalled when background work finishes
bool should_sleep_;
bool done_with_sleep_;
bool sleeping_;
};
// Filters merge operands and values that are equal to `num`.
class FilterNumber : public CompactionFilter {
public:
explicit FilterNumber(uint64_t num) : num_(num) {}
std::string last_merge_operand_key() { return last_merge_operand_key_; }
bool Filter(int /*level*/, const ROCKSDB_NAMESPACE::Slice& /*key*/,
const ROCKSDB_NAMESPACE::Slice& value, std::string* /*new_value*/,
bool* /*value_changed*/) const override {
if (value.size() == sizeof(uint64_t)) {
return num_ == DecodeFixed64(value.data());
}
return true;
}
bool FilterMergeOperand(
int /*level*/, const ROCKSDB_NAMESPACE::Slice& key,
const ROCKSDB_NAMESPACE::Slice& value) const override {
last_merge_operand_key_ = key.ToString();
if (value.size() == sizeof(uint64_t)) {
return num_ == DecodeFixed64(value.data());
}
return true;
}
const char* Name() const override { return "FilterBadMergeOperand"; }
private:
mutable std::string last_merge_operand_key_;
uint64_t num_;
};
inline std::string EncodeInt(uint64_t x) {
std::string result;
PutFixed64(&result, x);
return result;
}
class SeqStringSource : public FSSequentialFile {
public:
SeqStringSource(const std::string& data, std::atomic<int>* read_count)
: data_(data), offset_(0), read_count_(read_count) {}
~SeqStringSource() override {}
IOStatus Read(size_t n, const IOOptions& /*opts*/, Slice* result,
char* scratch, IODebugContext* /*dbg*/) override {
std::string output;
if (offset_ < data_.size()) {
n = std::min(data_.size() - offset_, n);
memcpy(scratch, data_.data() + offset_, n);
offset_ += n;
*result = Slice(scratch, n);
} else {
return IOStatus::InvalidArgument(
"Attempt to read when it already reached eof.");
}
(*read_count_)++;
return IOStatus::OK();
}
IOStatus Skip(uint64_t n) override {
if (offset_ >= data_.size()) {
return IOStatus::InvalidArgument(
"Attempt to read when it already reached eof.");
}
// TODO(yhchiang): Currently doesn't handle the overflow case.
offset_ += static_cast<size_t>(n);
return IOStatus::OK();
}
private:
std::string data_;
size_t offset_;
std::atomic<int>* read_count_;
};
class StringFS : public FileSystemWrapper {
public:
class StringSink : public FSWritableFile {
public:
explicit StringSink(std::string* contents)
: FSWritableFile(), contents_(contents) {}
IOStatus Truncate(uint64_t size, const IOOptions& /*opts*/,
IODebugContext* /*dbg*/) override {
contents_->resize(static_cast<size_t>(size));
return IOStatus::OK();
}
IOStatus Close(const IOOptions& /*opts*/,
IODebugContext* /*dbg*/) override {
return IOStatus::OK();
}
IOStatus Flush(const IOOptions& /*opts*/,
IODebugContext* /*dbg*/) override {
return IOStatus::OK();
}
IOStatus Sync(const IOOptions& /*opts*/, IODebugContext* /*dbg*/) override {
return IOStatus::OK();
}
using FSWritableFile::Append;
IOStatus Append(const Slice& slice, const IOOptions& /*opts*/,
IODebugContext* /*dbg*/) override {
contents_->append(slice.data(), slice.size());
return IOStatus::OK();
}
private:
std::string* contents_;
};
explicit StringFS(const std::shared_ptr<FileSystem>& t)
: FileSystemWrapper(t) {}
~StringFS() override {}
const std::string& GetContent(const std::string& f) { return files_[f]; }
const IOStatus WriteToNewFile(const std::string& file_name,
const std::string& content) {
std::unique_ptr<FSWritableFile> r;
FileOptions file_opts;
IOOptions io_opts;
auto s = NewWritableFile(file_name, file_opts, &r, nullptr);
if (s.ok()) {
s = r->Append(content, io_opts, nullptr);
}
if (s.ok()) {
s = r->Flush(io_opts, nullptr);
}
if (s.ok()) {
s = r->Close(io_opts, nullptr);
}
assert(!s.ok() || files_[file_name] == content);
return s;
}
// The following text is boilerplate that forwards all methods to target()
IOStatus NewSequentialFile(const std::string& f,
const FileOptions& /*options*/,
std::unique_ptr<FSSequentialFile>* r,
IODebugContext* /*dbg*/) override {
auto iter = files_.find(f);
if (iter == files_.end()) {
return IOStatus::NotFound("The specified file does not exist", f);
}
r->reset(new SeqStringSource(iter->second, &num_seq_file_read_));
return IOStatus::OK();
}
IOStatus NewRandomAccessFile(const std::string& /*f*/,
const FileOptions& /*options*/,
std::unique_ptr<FSRandomAccessFile>* /*r*/,
IODebugContext* /*dbg*/) override {
return IOStatus::NotSupported();
}
IOStatus NewWritableFile(const std::string& f, const FileOptions& /*options*/,
std::unique_ptr<FSWritableFile>* r,
IODebugContext* /*dbg*/) override {
auto iter = files_.find(f);
if (iter != files_.end()) {
return IOStatus::IOError("The specified file already exists", f);
}
r->reset(new StringSink(&files_[f]));
return IOStatus::OK();
}
IOStatus NewDirectory(const std::string& /*name*/,
const IOOptions& /*options*/,
std::unique_ptr<FSDirectory>* /*result*/,
IODebugContext* /*dbg*/) override {
return IOStatus::NotSupported();
}
IOStatus FileExists(const std::string& f, const IOOptions& /*options*/,
IODebugContext* /*dbg*/) override {
if (files_.find(f) == files_.end()) {
return IOStatus::NotFound();
}
return IOStatus::OK();
}
IOStatus GetChildren(const std::string& /*dir*/, const IOOptions& /*options*/,
std::vector<std::string>* /*r*/,
IODebugContext* /*dbg*/) override {
return IOStatus::NotSupported();
}
IOStatus DeleteFile(const std::string& f, const IOOptions& /*options*/,
IODebugContext* /*dbg*/) override {
files_.erase(f);
return IOStatus::OK();
}
IOStatus CreateDir(const std::string& /*d*/, const IOOptions& /*options*/,
IODebugContext* /*dbg*/) override {
return IOStatus::NotSupported();
}
IOStatus CreateDirIfMissing(const std::string& /*d*/,
const IOOptions& /*options*/,
IODebugContext* /*dbg*/) override {
return IOStatus::NotSupported();
}
IOStatus DeleteDir(const std::string& /*d*/, const IOOptions& /*options*/,
IODebugContext* /*dbg*/) override {
return IOStatus::NotSupported();
}
IOStatus GetFileSize(const std::string& f, const IOOptions& /*options*/,
uint64_t* s, IODebugContext* /*dbg*/) override {
auto iter = files_.find(f);
if (iter == files_.end()) {
return IOStatus::NotFound("The specified file does not exist:", f);
}
*s = iter->second.size();
return IOStatus::OK();
}
IOStatus GetFileModificationTime(const std::string& /*fname*/,
const IOOptions& /*options*/,
uint64_t* /*file_mtime*/,
IODebugContext* /*dbg*/) override {
return IOStatus::NotSupported();
}
IOStatus RenameFile(const std::string& /*s*/, const std::string& /*t*/,
const IOOptions& /*options*/,
IODebugContext* /*dbg*/) override {
return IOStatus::NotSupported();
}
IOStatus LinkFile(const std::string& /*s*/, const std::string& /*t*/,
const IOOptions& /*options*/,
IODebugContext* /*dbg*/) override {
return IOStatus::NotSupported();
}
IOStatus LockFile(const std::string& /*f*/, const IOOptions& /*options*/,
FileLock** /*l*/, IODebugContext* /*dbg*/) override {
return IOStatus::NotSupported();
}
IOStatus UnlockFile(FileLock* /*l*/, const IOOptions& /*options*/,
IODebugContext* /*dbg*/) override {
return IOStatus::NotSupported();
}
std::atomic<int> num_seq_file_read_;
protected:
std::unordered_map<std::string, std::string> files_;
};
// Randomly initialize the given DBOptions
void RandomInitDBOptions(DBOptions* db_opt, Random* rnd);
// Randomly initialize the given ColumnFamilyOptions
// Note that the caller is responsible for releasing non-null
// cf_opt->compaction_filter.
void RandomInitCFOptions(ColumnFamilyOptions* cf_opt, DBOptions&, Random* rnd);
// A dummy merge operator which can change its name
class ChanglingMergeOperator : public MergeOperator {
public:
explicit ChanglingMergeOperator(const std::string& name)
: name_(name + "MergeOperator") {}
~ChanglingMergeOperator() {}
void SetName(const std::string& name) { name_ = name; }
virtual bool FullMergeV2(const MergeOperationInput& /*merge_in*/,
MergeOperationOutput* /*merge_out*/) const override {
return false;
}
virtual bool PartialMergeMulti(const Slice& /*key*/,
const std::deque<Slice>& /*operand_list*/,
std::string* /*new_value*/,
Logger* /*logger*/) const override {
return false;
}
virtual const char* Name() const override { return name_.c_str(); }
protected:
std::string name_;
};
// Returns a dummy merge operator with random name.
MergeOperator* RandomMergeOperator(Random* rnd);
// A dummy compaction filter which can change its name
class ChanglingCompactionFilter : public CompactionFilter {
public:
explicit ChanglingCompactionFilter(const std::string& name)
: name_(name + "CompactionFilter") {}
~ChanglingCompactionFilter() {}
void SetName(const std::string& name) { name_ = name; }
bool Filter(int /*level*/, const Slice& /*key*/,
const Slice& /*existing_value*/, std::string* /*new_value*/,
bool* /*value_changed*/) const override {
return false;
}
const char* Name() const override { return name_.c_str(); }
private:
std::string name_;
};
// Returns a dummy compaction filter with a random name.
CompactionFilter* RandomCompactionFilter(Random* rnd);
// A dummy compaction filter factory which can change its name
class ChanglingCompactionFilterFactory : public CompactionFilterFactory {
public:
explicit ChanglingCompactionFilterFactory(const std::string& name)
: name_(name + "CompactionFilterFactory") {}
~ChanglingCompactionFilterFactory() {}
void SetName(const std::string& name) { name_ = name; }
std::unique_ptr<CompactionFilter> CreateCompactionFilter(
const CompactionFilter::Context& /*context*/) override {
return std::unique_ptr<CompactionFilter>();
}
// Returns a name that identifies this compaction filter factory.
const char* Name() const override { return name_.c_str(); }
protected:
std::string name_;
};
extern const Comparator* ComparatorWithU64Ts();
CompressionType RandomCompressionType(Random* rnd);
void RandomCompressionTypeVector(const size_t count,
std::vector<CompressionType>* types,
Random* rnd);
CompactionFilterFactory* RandomCompactionFilterFactory(Random* rnd);
const SliceTransform* RandomSliceTransform(Random* rnd, int pre_defined = -1);
TableFactory* RandomTableFactory(Random* rnd, int pre_defined = -1);
std::string RandomName(Random* rnd, const size_t len);
bool IsDirectIOSupported(Env* env, const std::string& dir);
bool IsPrefetchSupported(const std::shared_ptr<FileSystem>& fs,
const std::string& dir);
// Return the number of lines where a given pattern was found in a file.
size_t GetLinesCount(const std::string& fname, const std::string& pattern);
// TEST_TMPDIR may be set to /dev/shm in Makefile,
// but /dev/shm does not support direct IO.
// Tries to set TEST_TMPDIR to a directory supporting direct IO.
void ResetTmpDirForDirectIO();
Status CorruptFile(Env* env, const std::string& fname, int offset,
int bytes_to_corrupt, bool verify_checksum = true);
Status TruncateFile(Env* env, const std::string& fname, uint64_t length);
// Try and delete a directory if it exists
Status TryDeleteDir(Env* env, const std::string& dirname);
// Delete a directory if it exists
void DeleteDir(Env* env, const std::string& dirname);
} // namespace test
} // namespace ROCKSDB_NAMESPACE