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rocksdb/test_util/fault_injection_test_fs.h

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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 2014 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.
// This test uses a custom FileSystem to keep track of the state of a file
// system the last "Sync". The data being written is cached in a "buffer".
// Only when "Sync" is called, the data will be persistent. It can similate
// file data loss (or entire files) not protected by a "Sync". For any of the
// FileSystem related operations, by specify the "IOStatus Error", a specific
// error can be returned when file system is not activated.
#pragma once
#include <algorithm>
#include <map>
#include <set>
#include <string>
#include "db/db_test_util.h"
#include "db/version_set.h"
#include "env/mock_env.h"
#include "file/filename.h"
#include "include/rocksdb/file_system.h"
#include "rocksdb/db.h"
#include "rocksdb/env.h"
#include "util/mutexlock.h"
#include "util/random.h"
namespace ROCKSDB_NAMESPACE {
class TestFSWritableFile;
class FaultInjectionTestFS;
struct FSFileState {
std::string filename_;
ssize_t pos_;
ssize_t pos_at_last_sync_;
ssize_t pos_at_last_flush_;
std::string buffer_;
explicit FSFileState(const std::string& filename)
: filename_(filename),
pos_(-1),
pos_at_last_sync_(-1),
pos_at_last_flush_(-1) {}
FSFileState() : pos_(-1), pos_at_last_sync_(-1), pos_at_last_flush_(-1) {}
bool IsFullySynced() const { return pos_ <= 0 || pos_ == pos_at_last_sync_; }
IOStatus DropUnsyncedData();
IOStatus DropRandomUnsyncedData(Random* rand);
};
// A wrapper around WritableFileWriter* file
// is written to or sync'ed.
class TestFSWritableFile : public FSWritableFile {
public:
explicit TestFSWritableFile(const std::string& fname,
std::unique_ptr<FSWritableFile>&& f,
FaultInjectionTestFS* fs);
virtual ~TestFSWritableFile();
virtual IOStatus Append(const Slice& data, const IOOptions&,
IODebugContext*) override;
virtual IOStatus Truncate(uint64_t size, const IOOptions& options,
IODebugContext* dbg) override {
return target_->Truncate(size, options, dbg);
}
virtual IOStatus Close(const IOOptions& options,
IODebugContext* dbg) override;
virtual IOStatus Flush(const IOOptions&, IODebugContext*) override;
virtual IOStatus Sync(const IOOptions& options, IODebugContext* dbg) override;
virtual bool IsSyncThreadSafe() const override { return true; }
virtual IOStatus PositionedAppend(const Slice& data, uint64_t offset,
const IOOptions& options,
IODebugContext* dbg) override {
return target_->PositionedAppend(data, offset, options, dbg);
}
virtual size_t GetRequiredBufferAlignment() const override {
return target_->GetRequiredBufferAlignment();
}
virtual bool use_direct_io() const override {
return target_->use_direct_io();
};
private:
FSFileState state_;
std::unique_ptr<FSWritableFile> target_;
bool writable_file_opened_;
FaultInjectionTestFS* fs_;
port::Mutex mutex_;
};
// A wrapper around WritableFileWriter* file
// is written to or sync'ed.
class TestFSRandomRWFile : public FSRandomRWFile {
public:
explicit TestFSRandomRWFile(const std::string& fname,
std::unique_ptr<FSRandomRWFile>&& f,
FaultInjectionTestFS* fs);
virtual ~TestFSRandomRWFile();
IOStatus Write(uint64_t offset, const Slice& data, const IOOptions& options,
IODebugContext* dbg) override;
IOStatus Read(uint64_t offset, size_t n, const IOOptions& options,
Slice* result, char* scratch,
IODebugContext* dbg) const override;
IOStatus Close(const IOOptions& options, IODebugContext* dbg) override;
IOStatus Flush(const IOOptions& options, IODebugContext* dbg) override;
IOStatus Sync(const IOOptions& options, IODebugContext* dbg) override;
size_t GetRequiredBufferAlignment() const override {
return target_->GetRequiredBufferAlignment();
}
bool use_direct_io() const override { return target_->use_direct_io(); };
private:
std::unique_ptr<FSRandomRWFile> target_;
bool file_opened_;
FaultInjectionTestFS* fs_;
};
class TestFSRandomAccessFile : public FSRandomAccessFile {
public:
explicit TestFSRandomAccessFile(const std::string& fname,
std::unique_ptr<FSRandomAccessFile>&& f,
FaultInjectionTestFS* fs);
~TestFSRandomAccessFile() override {}
IOStatus Read(uint64_t offset, size_t n, const IOOptions& options,
Slice* result, char* scratch,
IODebugContext* dbg) const override;
size_t GetRequiredBufferAlignment() const override {
return target_->GetRequiredBufferAlignment();
}
bool use_direct_io() const override { return target_->use_direct_io(); }
private:
std::unique_ptr<FSRandomAccessFile> target_;
FaultInjectionTestFS* fs_;
};
class TestFSDirectory : public FSDirectory {
public:
explicit TestFSDirectory(FaultInjectionTestFS* fs, std::string dirname,
FSDirectory* dir)
: fs_(fs), dirname_(dirname), dir_(dir) {}
~TestFSDirectory() {}
virtual IOStatus Fsync(const IOOptions& options,
IODebugContext* dbg) override;
private:
FaultInjectionTestFS* fs_;
std::string dirname_;
std::unique_ptr<FSDirectory> dir_;
};
class FaultInjectionTestFS : public FileSystemWrapper {
public:
Simplify migration to FileSystem API (#6552) Summary: The current Env/FileSystem API separation has a couple of issues - 1. It requires the user to specify 2 options - ```Options::env``` and ```Options::file_system``` - which means they have to make code changes to benefit from the new APIs. Furthermore, there is a risk of accessing the same APIs in two different ways, through Env in the old way and through FileSystem in the new way. The two may not always match, for example, if env is ```PosixEnv``` and FileSystem is a custom implementation. Any stray RocksDB calls to env will use the ```PosixEnv``` implementation rather than the file_system implementation. 2. There needs to be a simple way for the FileSystem developer to instantiate an Env for backward compatibility purposes. This PR solves the above issues and simplifies the migration in the following ways - 1. Embed a shared_ptr to the ```FileSystem``` in the ```Env```, and remove ```Options::file_system``` as a configurable option. This way, no code changes will be required in application code to benefit from the new API. The default Env constructor uses a ```LegacyFileSystemWrapper``` as the embedded ```FileSystem```. 1a. - This also makes it more robust by ensuring that even if RocksDB has some stray calls to Env APIs rather than FileSystem, they will go through the same object and thus there is no risk of getting out of sync. 2. Provide a ```NewCompositeEnv()``` API that can be used to construct a PosixEnv with a custom FileSystem implementation. This eliminates an indirection to call Env APIs, and relieves the FileSystem developer of the burden of having to implement wrappers for the Env APIs. 3. Add a couple of missing FileSystem APIs - ```SanitizeEnvOptions()``` and ```NewLogger()``` Tests: 1. New unit tests 2. make check and make asan_check Pull Request resolved: https://github.com/facebook/rocksdb/pull/6552 Reviewed By: riversand963 Differential Revision: D20592038 Pulled By: anand1976 fbshipit-source-id: c3801ad4153f96d21d5a3ae26c92ba454d1bf1f7
5 years ago
explicit FaultInjectionTestFS(std::shared_ptr<FileSystem> base)
: FileSystemWrapper(base),
filesystem_active_(true),
filesystem_writable_(false),
thread_local_error_(
new ThreadLocalPtr(DeleteThreadLocalErrorContext)) {}
virtual ~FaultInjectionTestFS() {}
const char* Name() const override { return "FaultInjectionTestFS"; }
IOStatus NewDirectory(const std::string& name, const IOOptions& options,
std::unique_ptr<FSDirectory>* result,
IODebugContext* dbg) override;
IOStatus NewWritableFile(const std::string& fname,
const FileOptions& file_opts,
std::unique_ptr<FSWritableFile>* result,
IODebugContext* dbg) override;
IOStatus ReopenWritableFile(const std::string& fname,
const FileOptions& file_opts,
std::unique_ptr<FSWritableFile>* result,
IODebugContext* dbg) override;
IOStatus NewRandomRWFile(const std::string& fname,
const FileOptions& file_opts,
std::unique_ptr<FSRandomRWFile>* result,
IODebugContext* dbg) override;
IOStatus NewRandomAccessFile(const std::string& fname,
const FileOptions& file_opts,
std::unique_ptr<FSRandomAccessFile>* result,
IODebugContext* dbg) override;
virtual IOStatus DeleteFile(const std::string& f, const IOOptions& options,
IODebugContext* dbg) override;
virtual IOStatus RenameFile(const std::string& s, const std::string& t,
const IOOptions& options,
IODebugContext* dbg) override;
// Undef to eliminate clash on Windows
#undef GetFreeSpace
virtual IOStatus GetFreeSpace(const std::string& path,
const IOOptions& options, uint64_t* disk_free,
IODebugContext* dbg) override {
if (!IsFilesystemActive() && error_ == IOStatus::NoSpace()) {
*disk_free = 0;
return IOStatus::OK();
} else {
return target()->GetFreeSpace(path, options, disk_free, dbg);
}
}
void WritableFileClosed(const FSFileState& state);
void WritableFileSynced(const FSFileState& state);
void WritableFileAppended(const FSFileState& state);
IOStatus DropUnsyncedFileData();
IOStatus DropRandomUnsyncedFileData(Random* rnd);
IOStatus DeleteFilesCreatedAfterLastDirSync(const IOOptions& options,
IODebugContext* dbg);
void ResetState();
void UntrackFile(const std::string& f);
void SyncDir(const std::string& dirname) {
MutexLock l(&mutex_);
dir_to_new_files_since_last_sync_.erase(dirname);
}
// Setting the filesystem to inactive is the test equivalent to simulating a
// system reset. Setting to inactive will freeze our saved filesystem state so
// that it will stop being recorded. It can then be reset back to the state at
// the time of the reset.
bool IsFilesystemActive() {
MutexLock l(&mutex_);
return filesystem_active_;
}
// Setting filesystem_writable_ makes NewWritableFile. ReopenWritableFile,
// and NewRandomRWFile bypass FaultInjectionTestFS and go directly to the
// target FS
bool IsFilesystemDirectWritable() {
MutexLock l(&mutex_);
return filesystem_writable_;
}
void SetFilesystemActiveNoLock(
bool active, IOStatus error = IOStatus::Corruption("Not active")) {
filesystem_active_ = active;
if (!active) {
error_ = error;
}
}
void SetFilesystemActive(
bool active, IOStatus error = IOStatus::Corruption("Not active")) {
MutexLock l(&mutex_);
SetFilesystemActiveNoLock(active, error);
}
void SetFilesystemDirectWritable(
bool writable) {
MutexLock l(&mutex_);
filesystem_writable_ = writable;
}
void AssertNoOpenFile() { assert(open_files_.empty()); }
IOStatus GetError() { return error_; }
void SetFileSystemIOError(IOStatus io_error) {
MutexLock l(&mutex_);
error_ = io_error;
}
// Specify what the operation, so we can inject the right type of error
enum ErrorOperation : char {
kRead = 0,
kOpen,
};
// Set thread-local parameters for error injection. The first argument,
// seed is the seed for the random number generator, and one_in determines
// the probability of injecting error (i.e an error is injected with
// 1/one_in probability)
void SetThreadLocalReadErrorContext(uint32_t seed, int one_in) {
struct ErrorContext* ctx =
static_cast<struct ErrorContext*>(thread_local_error_->Get());
if (ctx == nullptr) {
ctx = new ErrorContext(seed);
thread_local_error_->Reset(ctx);
}
ctx->one_in = one_in;
ctx->count = 0;
}
static void DeleteThreadLocalErrorContext(void *p) {
ErrorContext* ctx = static_cast<ErrorContext*>(p);
delete ctx;
}
// Inject an error. For a READ operation, a status of IOError(), a
// corruption in the contents of scratch, or truncation of slice
// are the types of error with equal probability. For OPEN,
// its always an IOError.
IOStatus InjectError(ErrorOperation op, Slice* slice, char* scratch);
// Get the count of how many times we injected since the previous call
int GetAndResetErrorCount() {
ErrorContext* ctx =
static_cast<ErrorContext*>(thread_local_error_->Get());
int count = 0;
if (ctx != nullptr) {
count = ctx->count;
ctx->count = 0;
}
return count;
}
void EnableErrorInjection() {
ErrorContext* ctx =
static_cast<ErrorContext*>(thread_local_error_->Get());
if (ctx) {
ctx->enable_error_injection = true;
}
}
void DisableErrorInjection() {
ErrorContext* ctx =
static_cast<ErrorContext*>(thread_local_error_->Get());
if (ctx) {
ctx->enable_error_injection = false;
}
}
// We capture a backtrace every time a fault is injected, for debugging
// purposes. This call prints the backtrace to stderr and frees the
// saved callstack
void PrintFaultBacktrace();
private:
port::Mutex mutex_;
std::map<std::string, FSFileState> db_file_state_;
std::set<std::string> open_files_;
std::unordered_map<std::string, std::set<std::string>>
dir_to_new_files_since_last_sync_;
bool filesystem_active_; // Record flushes, syncs, writes
bool filesystem_writable_; // Bypass FaultInjectionTestFS and go directly
// to underlying FS for writable files
IOStatus error_;
struct ErrorContext {
Random rand;
int one_in;
int count;
bool enable_error_injection;
void* callstack;
int frames;
explicit ErrorContext(uint32_t seed)
: rand(seed),
enable_error_injection(false),
callstack(nullptr),
frames(0) {}
~ErrorContext() {
if (callstack) {
free(callstack);
}
}
};
std::unique_ptr<ThreadLocalPtr> thread_local_error_;
};
} // namespace ROCKSDB_NAMESPACE