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rocksdb/env/mock_env.cc

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// 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.
#include "env/mock_env.h"
#include <algorithm>
#include <chrono>
#include "port/sys_time.h"
#include "util/murmurhash.h"
#include "util/random.h"
#include "util/rate_limiter.h"
namespace rocksdb {
class MemFile {
public:
explicit MemFile(Env* env, const std::string& fn, bool _is_lock_file = false)
: env_(env),
fn_(fn),
refs_(0),
is_lock_file_(_is_lock_file),
locked_(false),
size_(0),
modified_time_(Now()),
rnd_(static_cast<uint32_t>(
MurmurHash(fn.data(), static_cast<int>(fn.size()), 0))),
fsynced_bytes_(0) {}
void Ref() {
MutexLock lock(&mutex_);
++refs_;
}
bool is_lock_file() const { return is_lock_file_; }
bool Lock() {
assert(is_lock_file_);
MutexLock lock(&mutex_);
if (locked_) {
return false;
} else {
locked_ = true;
return true;
}
}
void Unlock() {
assert(is_lock_file_);
MutexLock lock(&mutex_);
locked_ = false;
}
void Unref() {
bool do_delete = false;
{
MutexLock lock(&mutex_);
--refs_;
assert(refs_ >= 0);
if (refs_ <= 0) {
do_delete = true;
}
}
if (do_delete) {
delete this;
}
}
uint64_t Size() const {
return size_;
}
void Truncate(size_t size) {
MutexLock lock(&mutex_);
if (size < size_) {
data_.resize(size);
size_ = size;
}
}
void CorruptBuffer() {
if (fsynced_bytes_ >= size_) {
return;
}
uint64_t buffered_bytes = size_ - fsynced_bytes_;
uint64_t start =
fsynced_bytes_ + rnd_.Uniform(static_cast<int>(buffered_bytes));
uint64_t end = std::min(start + 512, size_.load());
MutexLock lock(&mutex_);
for (uint64_t pos = start; pos < end; ++pos) {
data_[pos] = static_cast<char>(rnd_.Uniform(256));
}
}
Status Read(uint64_t offset, size_t n, Slice* result, char* scratch) const {
MutexLock lock(&mutex_);
const uint64_t available = Size() - std::min(Size(), offset);
if (n > available) {
n = available;
}
if (n == 0) {
*result = Slice();
return Status::OK();
}
if (scratch) {
memcpy(scratch, &(data_[offset]), n);
*result = Slice(scratch, n);
} else {
*result = Slice(&(data_[offset]), n);
}
return Status::OK();
}
Status Write(uint64_t offset, const Slice& data) {
MutexLock lock(&mutex_);
if (offset + data.size() > data_.size()) {
data_.resize(offset + data.size());
}
data_.replace(offset, data.size(), data.data(), data.size());
size_ = data_.size();
modified_time_ = Now();
return Status::OK();
}
Status Append(const Slice& data) {
MutexLock lock(&mutex_);
data_.append(data.data(), data.size());
size_ = data_.size();
modified_time_ = Now();
return Status::OK();
}
Status Fsync() {
fsynced_bytes_ = size_.load();
return Status::OK();
}
uint64_t ModifiedTime() const {
return modified_time_;
}
private:
uint64_t Now() {
int64_t unix_time = 0;
auto s = env_->GetCurrentTime(&unix_time);
assert(s.ok());
return static_cast<uint64_t>(unix_time);
}
// Private since only Unref() should be used to delete it.
~MemFile() {
assert(refs_ == 0);
}
// No copying allowed.
MemFile(const MemFile&);
void operator=(const MemFile&);
Env* env_;
const std::string fn_;
mutable port::Mutex mutex_;
int refs_;
bool is_lock_file_;
bool locked_;
// Data written into this file, all bytes before fsynced_bytes are
// persistent.
std::string data_;
std::atomic<uint64_t> size_;
std::atomic<uint64_t> modified_time_;
Random rnd_;
std::atomic<uint64_t> fsynced_bytes_;
};
namespace {
class MockSequentialFile : public SequentialFile {
public:
explicit MockSequentialFile(MemFile* file) : file_(file), pos_(0) {
file_->Ref();
}
~MockSequentialFile() {
file_->Unref();
}
virtual Status Read(size_t n, Slice* result, char* scratch) override {
Status s = file_->Read(pos_, n, result, scratch);
if (s.ok()) {
pos_ += result->size();
}
return s;
}
virtual Status Skip(uint64_t n) override {
if (pos_ > file_->Size()) {
return Status::IOError("pos_ > file_->Size()");
}
const size_t available = file_->Size() - pos_;
if (n > available) {
n = available;
}
pos_ += n;
return Status::OK();
}
private:
MemFile* file_;
size_t pos_;
};
class MockRandomAccessFile : public RandomAccessFile {
public:
explicit MockRandomAccessFile(MemFile* file) : file_(file) {
file_->Ref();
}
~MockRandomAccessFile() {
file_->Unref();
}
virtual Status Read(uint64_t offset, size_t n, Slice* result,
char* scratch) const override {
return file_->Read(offset, n, result, scratch);
}
private:
MemFile* file_;
};
class MockRandomRWFile : public RandomRWFile {
public:
explicit MockRandomRWFile(MemFile* file) : file_(file) { file_->Ref(); }
~MockRandomRWFile() { file_->Unref(); }
virtual Status Write(uint64_t offset, const Slice& data) override {
return file_->Write(offset, data);
}
virtual Status Read(uint64_t offset, size_t n, Slice* result,
char* scratch) const override {
return file_->Read(offset, n, result, scratch);
}
virtual Status Close() override { return file_->Fsync(); }
virtual Status Flush() override { return Status::OK(); }
virtual Status Sync() override { return file_->Fsync(); }
private:
MemFile* file_;
};
class MockWritableFile : public WritableFile {
public:
MockWritableFile(MemFile* file, RateLimiter* rate_limiter)
: file_(file),
rate_limiter_(rate_limiter) {
file_->Ref();
}
~MockWritableFile() {
file_->Unref();
}
virtual Status Append(const Slice& data) override {
uint64_t bytes_written = 0;
while (bytes_written < data.size()) {
auto bytes = RequestToken(data.size() - bytes_written);
Status s = file_->Append(Slice(data.data() + bytes_written, bytes));
if (!s.ok()) {
return s;
}
bytes_written += bytes;
}
return Status::OK();
}
virtual Status Truncate(uint64_t size) override {
file_->Truncate(size);
return Status::OK();
}
virtual Status Close() override { return file_->Fsync(); }
virtual Status Flush() override { return Status::OK(); }
virtual Status Sync() override { return file_->Fsync(); }
virtual uint64_t GetFileSize() override { return file_->Size(); }
private:
inline size_t RequestToken(size_t bytes) {
if (rate_limiter_ && io_priority_ < Env::IO_TOTAL) {
bytes = std::min(bytes,
static_cast<size_t>(rate_limiter_->GetSingleBurstBytes()));
rate_limiter_->Request(bytes, io_priority_);
}
return bytes;
}
MemFile* file_;
RateLimiter* rate_limiter_;
};
class MockEnvDirectory : public Directory {
public:
virtual Status Fsync() override { return Status::OK(); }
};
class MockEnvFileLock : public FileLock {
public:
explicit MockEnvFileLock(const std::string& fname)
: fname_(fname) {}
std::string FileName() const {
return fname_;
}
private:
const std::string fname_;
};
class TestMemLogger : public Logger {
private:
std::unique_ptr<WritableFile> file_;
std::atomic_size_t log_size_;
static const uint64_t flush_every_seconds_ = 5;
std::atomic_uint_fast64_t last_flush_micros_;
Env* env_;
bool flush_pending_;
public:
TestMemLogger(std::unique_ptr<WritableFile> f, Env* env,
const InfoLogLevel log_level = InfoLogLevel::ERROR_LEVEL)
: Logger(log_level),
file_(std::move(f)),
log_size_(0),
last_flush_micros_(0),
env_(env),
flush_pending_(false) {}
virtual ~TestMemLogger() {
}
virtual void Flush() override {
if (flush_pending_) {
flush_pending_ = false;
}
last_flush_micros_ = env_->NowMicros();
}
using Logger::Logv;
virtual void Logv(const char* format, va_list ap) override {
// We try twice: the first time with a fixed-size stack allocated buffer,
// and the second time with a much larger dynamically allocated buffer.
char buffer[500];
for (int iter = 0; iter < 2; iter++) {
char* base;
int bufsize;
if (iter == 0) {
bufsize = sizeof(buffer);
base = buffer;
} else {
bufsize = 30000;
base = new char[bufsize];
}
char* p = base;
char* limit = base + bufsize;
struct timeval now_tv;
gettimeofday(&now_tv, nullptr);
const time_t seconds = now_tv.tv_sec;
struct tm t;
memset(&t, 0, sizeof(t));
auto ret __attribute__((__unused__)) = localtime_r(&seconds, &t);
assert(ret);
p += snprintf(p, limit - p,
"%04d/%02d/%02d-%02d:%02d:%02d.%06d ",
t.tm_year + 1900,
t.tm_mon + 1,
t.tm_mday,
t.tm_hour,
t.tm_min,
t.tm_sec,
static_cast<int>(now_tv.tv_usec));
// Print the message
if (p < limit) {
va_list backup_ap;
va_copy(backup_ap, ap);
p += vsnprintf(p, limit - p, format, backup_ap);
va_end(backup_ap);
}
// Truncate to available space if necessary
if (p >= limit) {
if (iter == 0) {
continue; // Try again with larger buffer
} else {
p = limit - 1;
}
}
// Add newline if necessary
if (p == base || p[-1] != '\n') {
*p++ = '\n';
}
assert(p <= limit);
const size_t write_size = p - base;
file_->Append(Slice(base, write_size));
flush_pending_ = true;
log_size_ += write_size;
uint64_t now_micros = static_cast<uint64_t>(now_tv.tv_sec) * 1000000 +
now_tv.tv_usec;
if (now_micros - last_flush_micros_ >= flush_every_seconds_ * 1000000) {
flush_pending_ = false;
last_flush_micros_ = now_micros;
}
if (base != buffer) {
delete[] base;
}
break;
}
}
size_t GetLogFileSize() const override { return log_size_; }
};
} // Anonymous namespace
MockEnv::MockEnv(Env* base_env) : EnvWrapper(base_env), fake_sleep_micros_(0) {}
MockEnv::~MockEnv() {
for (FileSystem::iterator i = file_map_.begin(); i != file_map_.end(); ++i) {
i->second->Unref();
}
}
// Partial implementation of the Env interface.
Status MockEnv::NewSequentialFile(const std::string& fname,
unique_ptr<SequentialFile>* result,
const EnvOptions& soptions) {
auto fn = NormalizePath(fname);
MutexLock lock(&mutex_);
if (file_map_.find(fn) == file_map_.end()) {
*result = NULL;
return Status::IOError(fn, "File not found");
}
auto* f = file_map_[fn];
if (f->is_lock_file()) {
return Status::InvalidArgument(fn, "Cannot open a lock file.");
}
result->reset(new MockSequentialFile(f));
return Status::OK();
}
Status MockEnv::NewRandomAccessFile(const std::string& fname,
unique_ptr<RandomAccessFile>* result,
const EnvOptions& soptions) {
auto fn = NormalizePath(fname);
MutexLock lock(&mutex_);
if (file_map_.find(fn) == file_map_.end()) {
*result = NULL;
return Status::IOError(fn, "File not found");
}
auto* f = file_map_[fn];
if (f->is_lock_file()) {
return Status::InvalidArgument(fn, "Cannot open a lock file.");
}
result->reset(new MockRandomAccessFile(f));
return Status::OK();
}
Status MockEnv::NewRandomRWFile(const std::string& fname,
unique_ptr<RandomRWFile>* result,
const EnvOptions& soptions) {
auto fn = NormalizePath(fname);
MutexLock lock(&mutex_);
if (file_map_.find(fn) == file_map_.end()) {
*result = NULL;
return Status::IOError(fn, "File not found");
}
auto* f = file_map_[fn];
if (f->is_lock_file()) {
return Status::InvalidArgument(fn, "Cannot open a lock file.");
}
result->reset(new MockRandomRWFile(f));
return Status::OK();
}
Status MockEnv::ReuseWritableFile(const std::string& fname,
const std::string& old_fname,
unique_ptr<WritableFile>* result,
const EnvOptions& options) {
auto s = RenameFile(old_fname, fname);
if (!s.ok()) {
return s;
}
result->reset();
return NewWritableFile(fname, result, options);
}
Status MockEnv::NewWritableFile(const std::string& fname,
unique_ptr<WritableFile>* result,
const EnvOptions& env_options) {
auto fn = NormalizePath(fname);
MutexLock lock(&mutex_);
if (file_map_.find(fn) != file_map_.end()) {
DeleteFileInternal(fn);
}
MemFile* file = new MemFile(this, fn, false);
file->Ref();
file_map_[fn] = file;
result->reset(new MockWritableFile(file, env_options.rate_limiter));
return Status::OK();
}
Status MockEnv::NewDirectory(const std::string& name,
unique_ptr<Directory>* result) {
result->reset(new MockEnvDirectory());
return Status::OK();
}
Status MockEnv::FileExists(const std::string& fname) {
auto fn = NormalizePath(fname);
MutexLock lock(&mutex_);
if (file_map_.find(fn) != file_map_.end()) {
// File exists
return Status::OK();
}
// Now also check if fn exists as a dir
for (const auto& iter : file_map_) {
const std::string& filename = iter.first;
if (filename.size() >= fn.size() + 1 &&
filename[fn.size()] == '/' &&
Slice(filename).starts_with(Slice(fn))) {
return Status::OK();
}
}
return Status::NotFound();
}
Status MockEnv::GetChildren(const std::string& dir,
std::vector<std::string>* result) {
auto d = NormalizePath(dir);
bool found_dir = false;
{
MutexLock lock(&mutex_);
result->clear();
for (const auto& iter : file_map_) {
const std::string& filename = iter.first;
if (filename == d) {
found_dir = true;
} else if (filename.size() >= d.size() + 1 && filename[d.size()] == '/' &&
Slice(filename).starts_with(Slice(d))) {
found_dir = true;
size_t next_slash = filename.find('/', d.size() + 1);
if (next_slash != std::string::npos) {
result->push_back(filename.substr(
d.size() + 1, next_slash - d.size() - 1));
} else {
result->push_back(filename.substr(d.size() + 1));
}
}
}
}
result->erase(std::unique(result->begin(), result->end()), result->end());
return found_dir ? Status::OK() : Status::NotFound();
}
void MockEnv::DeleteFileInternal(const std::string& fname) {
assert(fname == NormalizePath(fname));
const auto& pair = file_map_.find(fname);
if (pair != file_map_.end()) {
pair->second->Unref();
file_map_.erase(fname);
}
}
Status MockEnv::DeleteFile(const std::string& fname) {
auto fn = NormalizePath(fname);
MutexLock lock(&mutex_);
if (file_map_.find(fn) == file_map_.end()) {
return Status::IOError(fn, "File not found");
}
DeleteFileInternal(fn);
return Status::OK();
}
Status MockEnv::CreateDir(const std::string& dirname) {
auto dn = NormalizePath(dirname);
if (file_map_.find(dn) == file_map_.end()) {
MemFile* file = new MemFile(this, dn, false);
file->Ref();
file_map_[dn] = file;
} else {
return Status::IOError();
}
return Status::OK();
}
Status MockEnv::CreateDirIfMissing(const std::string& dirname) {
CreateDir(dirname);
return Status::OK();
}
Status MockEnv::DeleteDir(const std::string& dirname) {
return DeleteFile(dirname);
}
Status MockEnv::GetFileSize(const std::string& fname, uint64_t* file_size) {
auto fn = NormalizePath(fname);
MutexLock lock(&mutex_);
auto iter = file_map_.find(fn);
if (iter == file_map_.end()) {
return Status::IOError(fn, "File not found");
}
*file_size = iter->second->Size();
return Status::OK();
}
Status MockEnv::GetFileModificationTime(const std::string& fname,
uint64_t* time) {
auto fn = NormalizePath(fname);
MutexLock lock(&mutex_);
auto iter = file_map_.find(fn);
if (iter == file_map_.end()) {
return Status::IOError(fn, "File not found");
}
*time = iter->second->ModifiedTime();
return Status::OK();
}
Status MockEnv::RenameFile(const std::string& src, const std::string& dest) {
auto s = NormalizePath(src);
auto t = NormalizePath(dest);
MutexLock lock(&mutex_);
if (file_map_.find(s) == file_map_.end()) {
return Status::IOError(s, "File not found");
}
DeleteFileInternal(t);
file_map_[t] = file_map_[s];
file_map_.erase(s);
return Status::OK();
}
Status MockEnv::LinkFile(const std::string& src, const std::string& dest) {
auto s = NormalizePath(src);
auto t = NormalizePath(dest);
MutexLock lock(&mutex_);
if (file_map_.find(s) == file_map_.end()) {
return Status::IOError(s, "File not found");
}
DeleteFileInternal(t);
file_map_[t] = file_map_[s];
file_map_[t]->Ref(); // Otherwise it might get deleted when noone uses s
return Status::OK();
}
Status MockEnv::NewLogger(const std::string& fname,
shared_ptr<Logger>* result) {
auto fn = NormalizePath(fname);
MutexLock lock(&mutex_);
auto iter = file_map_.find(fn);
MemFile* file = nullptr;
if (iter == file_map_.end()) {
file = new MemFile(this, fn, false);
file->Ref();
file_map_[fn] = file;
} else {
file = iter->second;
}
std::unique_ptr<WritableFile> f(new MockWritableFile(file, nullptr));
result->reset(new TestMemLogger(std::move(f), this));
return Status::OK();
}
Status MockEnv::LockFile(const std::string& fname, FileLock** flock) {
auto fn = NormalizePath(fname);
{
MutexLock lock(&mutex_);
if (file_map_.find(fn) != file_map_.end()) {
if (!file_map_[fn]->is_lock_file()) {
return Status::InvalidArgument(fname, "Not a lock file.");
}
if (!file_map_[fn]->Lock()) {
return Status::IOError(fn, "Lock is already held.");
}
} else {
auto* file = new MemFile(this, fn, true);
file->Ref();
file->Lock();
file_map_[fn] = file;
}
}
*flock = new MockEnvFileLock(fn);
return Status::OK();
}
Status MockEnv::UnlockFile(FileLock* flock) {
std::string fn = dynamic_cast<MockEnvFileLock*>(flock)->FileName();
{
MutexLock lock(&mutex_);
if (file_map_.find(fn) != file_map_.end()) {
if (!file_map_[fn]->is_lock_file()) {
return Status::InvalidArgument(fn, "Not a lock file.");
}
file_map_[fn]->Unlock();
}
}
delete flock;
return Status::OK();
}
Status MockEnv::GetTestDirectory(std::string* path) {
*path = "/test";
return Status::OK();
}
Status MockEnv::GetCurrentTime(int64_t* unix_time) {
auto s = EnvWrapper::GetCurrentTime(unix_time);
if (s.ok()) {
*unix_time += fake_sleep_micros_.load() / (1000 * 1000);
}
return s;
}
uint64_t MockEnv::NowMicros() {
return EnvWrapper::NowMicros() + fake_sleep_micros_.load();
}
uint64_t MockEnv::NowNanos() {
return EnvWrapper::NowNanos() + fake_sleep_micros_.load() * 1000;
}
// Non-virtual functions, specific to MockEnv
Status MockEnv::Truncate(const std::string& fname, size_t size) {
auto fn = NormalizePath(fname);
MutexLock lock(&mutex_);
auto iter = file_map_.find(fn);
if (iter == file_map_.end()) {
return Status::IOError(fn, "File not found");
}
iter->second->Truncate(size);
return Status::OK();
}
Status MockEnv::CorruptBuffer(const std::string& fname) {
auto fn = NormalizePath(fname);
MutexLock lock(&mutex_);
auto iter = file_map_.find(fn);
if (iter == file_map_.end()) {
return Status::IOError(fn, "File not found");
}
iter->second->CorruptBuffer();
return Status::OK();
}
std::string MockEnv::NormalizePath(const std::string path) {
std::string dst;
for (auto c : path) {
if (!dst.empty() && c == '/' && dst.back() == '/') {
continue;
}
dst.push_back(c);
}
return dst;
}
void MockEnv::FakeSleepForMicroseconds(int64_t micros) {
fake_sleep_micros_.fetch_add(micros);
}
#ifndef ROCKSDB_LITE
// This is to maintain the behavior before swithcing from InMemoryEnv to MockEnv
Env* NewMemEnv(Env* base_env) { return new MockEnv(base_env); }
#else // ROCKSDB_LITE
Env* NewMemEnv(Env* base_env) { return nullptr; }
#endif // !ROCKSDB_LITE
} // namespace rocksdb