From 19fcec84d8d7d21e796c7624e521b60d28ee21ed Mon Sep 17 00:00:00 2001
From: Daniel Baumann <daniel.baumann@progress-linux.org>
Date: Sun, 7 Apr 2024 20:45:59 +0200
Subject: Adding upstream version 16.2.11+ds.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
---
 src/rocksdb/env/mock_env.cc | 774 ++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 774 insertions(+)
 create mode 100644 src/rocksdb/env/mock_env.cc

(limited to 'src/rocksdb/env/mock_env.cc')

diff --git a/src/rocksdb/env/mock_env.cc b/src/rocksdb/env/mock_env.cc
new file mode 100644
index 000000000..c246c13e1
--- /dev/null
+++ b/src/rocksdb/env/mock_env.cc
@@ -0,0 +1,774 @@
+//  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/cast_util.h"
+#include "util/murmurhash.h"
+#include "util/random.h"
+#include "util/rate_limiter.h"
+
+namespace ROCKSDB_NAMESPACE {
+
+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) {}
+  // No copying allowed.
+  MemFile(const MemFile&) = delete;
+  void operator=(const MemFile&) = delete;
+
+  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_[static_cast<size_t>(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);
+    size_t offset_ = static_cast<size_t>(offset);
+    if (n > available) {
+      n = static_cast<size_t>(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_);
+    size_t offset_ = static_cast<size_t>(offset);
+    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); }
+
+  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() override { file_->Unref(); }
+
+  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;
+  }
+
+  Status Skip(uint64_t n) override {
+    if (pos_ > file_->Size()) {
+      return Status::IOError("pos_ > file_->Size()");
+    }
+    const uint64_t available = file_->Size() - pos_;
+    if (n > available) {
+      n = available;
+    }
+    pos_ += static_cast<size_t>(n);
+    return Status::OK();
+  }
+
+ private:
+  MemFile* file_;
+  size_t pos_;
+};
+
+class MockRandomAccessFile : public RandomAccessFile {
+ public:
+  explicit MockRandomAccessFile(MemFile* file) : file_(file) { file_->Ref(); }
+
+  ~MockRandomAccessFile() override { file_->Unref(); }
+
+  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() override { file_->Unref(); }
+
+  Status Write(uint64_t offset, const Slice& data) override {
+    return file_->Write(offset, data);
+  }
+
+  Status Read(uint64_t offset, size_t n, Slice* result,
+              char* scratch) const override {
+    return file_->Read(offset, n, result, scratch);
+  }
+
+  Status Close() override { return file_->Fsync(); }
+
+  Status Flush() override { return Status::OK(); }
+
+  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() override { file_->Unref(); }
+
+  Status Append(const Slice& data) override {
+    size_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();
+  }
+  Status Truncate(uint64_t size) override {
+    file_->Truncate(static_cast<size_t>(size));
+    return Status::OK();
+  }
+  Status Close() override { return file_->Fsync(); }
+
+  Status Flush() override { return Status::OK(); }
+
+  Status Sync() override { return file_->Fsync(); }
+
+  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:
+  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_;
+  std::atomic<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) {}
+  ~TestMemLogger() override {}
+
+  void Flush() override {
+    if (flush_pending_) {
+      flush_pending_ = false;
+    }
+    last_flush_micros_ = env_->NowMicros();
+  }
+
+  using Logger::Logv;
+  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));
+      struct tm* ret __attribute__((__unused__));
+      ret = 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,
+                                  std::unique_ptr<SequentialFile>* result,
+                                  const EnvOptions& /*soptions*/) {
+  auto fn = NormalizePath(fname);
+  MutexLock lock(&mutex_);
+  if (file_map_.find(fn) == file_map_.end()) {
+    *result = nullptr;
+    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,
+                                    std::unique_ptr<RandomAccessFile>* result,
+                                    const EnvOptions& /*soptions*/) {
+  auto fn = NormalizePath(fname);
+  MutexLock lock(&mutex_);
+  if (file_map_.find(fn) == file_map_.end()) {
+    *result = nullptr;
+    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,
+                                std::unique_ptr<RandomRWFile>* result,
+                                const EnvOptions& /*soptions*/) {
+  auto fn = NormalizePath(fname);
+  MutexLock lock(&mutex_);
+  if (file_map_.find(fn) == file_map_.end()) {
+    *result = nullptr;
+    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,
+                                  std::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,
+                                std::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*/,
+                             std::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::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::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,
+                          std::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 =
+      static_cast_with_check<MockEnvFileLock, FileLock>(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;
+}
+
+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_NAMESPACE
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