From 9ab0132360fbf68eb0561f7525e726d4d3a4c0f7 Mon Sep 17 00:00:00 2001 From: Lei Jin Date: Tue, 28 Oct 2014 15:31:38 -0700 Subject: [PATCH] tmp Summary: Test Plan: Reviewers: CC: Task ID: # Blame Rev: --- include/rocksdb/env.h | 1 + util/env_mem.cc | 367 ++++++++++++++++++++++++++++++++++++++++++ util/env_mem_test.cc | 231 ++++++++++++++++++++++++++ 3 files changed, 599 insertions(+) create mode 100644 util/env_mem.cc create mode 100644 util/env_mem_test.cc diff --git a/include/rocksdb/env.h b/include/rocksdb/env.h index 70244bb31..b0cd40ddd 100644 --- a/include/rocksdb/env.h +++ b/include/rocksdb/env.h @@ -798,6 +798,7 @@ class EnvWrapper : public Env { // when it is no longer needed. // *base_env must remain live while the result is in use. Env* NewMemEnv(Env* base_env); +Env* NewTestMemEnv(Env* base_env); } // namespace rocksdb diff --git a/util/env_mem.cc b/util/env_mem.cc new file mode 100644 index 000000000..43337da7e --- /dev/null +++ b/util/env_mem.cc @@ -0,0 +1,367 @@ +// 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 "rocksdb/env.h" +#include "rocksdb/status.h" +#include "port/port.h" +#include "util/mutexlock.h" +#include +#include +#include +#include + +namespace rocksdb { + +namespace { + +class MemFile { + public: + enum Mode { + READ = 0, + WRITE = 1, + }; + + MemFile(Mode mode) : mode_(mode), refs_(0) {} + + void Ref() { + MutexLock lock(&mutex_); + ++refs_; + } + + void Unref() { + bool do_delete = false; + { + MutexLock lock(&mutex_); + --refs_; + assert(refs_ >= 0); + if (refs_ <= 0) { + do_delete = true; + } + } + + if (do_delete) { + delete this; + } + } + + void SetMode(Mode mode) { + mode_ = mode; + } + + uint64_t Size() const { return data_.size(); } + + Status Read(uint64_t offset, size_t n, Slice* result, char* scratch) const { + assert(mode_ == READ); + if (offset > Size()) { + return Status::IOError("Offset greater than file size."); + } + const uint64_t available = 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 Append(const Slice& data) { + assert(mode_ == WRITE); + data_.append(data.data(), data.size()); + return Status::OK(); + } + + Status Fsync() { + return Status::OK(); + } + + private: + // Private since only Unref() should be used to delete it. + ~MemFile() { + assert(refs_ == 0); + } + + // No copying allowed. + MemFile(const MemFile&); + void operator=(const MemFile&); + + Mode mode_; + port::Mutex mutex_; + int refs_; // Protected by mutex_; + + std::string data_; +}; + +class SequentialFileImpl : public SequentialFile { + public: + explicit SequentialFileImpl(MemFile* file) : file_(file), pos_(0) { + file_->Ref(); + } + + ~SequentialFileImpl() { + file_->Unref(); + } + + virtual Status Read(size_t n, Slice* result, char* scratch) { + Status s = file_->Read(pos_, n, result, scratch); + if (s.ok()) { + pos_ += result->size(); + } + return s; + } + + virtual Status Skip(uint64_t n) { + 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 RandomAccessFileImpl : public RandomAccessFile { + public: + explicit RandomAccessFileImpl(MemFile* file) : file_(file) { + file_->Ref(); + } + + ~RandomAccessFileImpl() { + file_->Unref(); + } + + virtual Status Read(uint64_t offset, size_t n, Slice* result, + char* scratch) const { + return file_->Read(offset, n, result, scratch); + } + + private: + MemFile* file_; +}; + +class WritableFileImpl : public WritableFile { + public: + WritableFileImpl(MemFile* file) : file_(file) { + file_->Ref(); + } + + ~WritableFileImpl() { + file_->Unref(); + } + + virtual Status Append(const Slice& data) { + return file_->Append(data); + } + + virtual Status Close() { + return Status::OK(); + } + + virtual Status Flush() { + return Status::OK(); + } + + virtual Status Sync() { + return file_->Fsync(); + } + + private: + MemFile* file_; +}; + +class TestMemDirectory : public Directory { + public: + virtual Status Fsync() { return Status::OK(); } +}; + +class TestMemEnv : public EnvWrapper { + public: + explicit TestMemEnv(Env* base_env) : EnvWrapper(base_env) { } + + virtual ~TestMemEnv() { + for (FileSystem::iterator i = file_map_.begin(); i != file_map_.end(); ++i){ + i->second->Unref(); + } + } + + // Partial implementation of the Env interface. + virtual Status NewSequentialFile(const std::string& fname, + unique_ptr* result, + const EnvOptions& soptions) { + MutexLock lock(&mutex_); + if (file_map_.find(fname) == file_map_.end()) { + *result = NULL; + return Status::IOError(fname, "File not found"); + } + auto* f = file_map_[fname]; + f->SetMode(MemFile::READ); + result->reset(new SequentialFileImpl(f)); + return Status::OK(); + } + + virtual Status NewRandomAccessFile(const std::string& fname, + unique_ptr* result, + const EnvOptions& soptions) { + MutexLock lock(&mutex_); + if (file_map_.find(fname) == file_map_.end()) { + *result = NULL; + return Status::IOError(fname, "File not found"); + } + auto* f = file_map_[fname]; + f->SetMode(MemFile::READ); + result->reset(new RandomAccessFileImpl(f)); + return Status::OK(); + } + + virtual Status NewWritableFile(const std::string& fname, + unique_ptr* result, + const EnvOptions& soptions) { + MutexLock lock(&mutex_); + if (file_map_.find(fname) != file_map_.end()) { + DeleteFileInternal(fname); + } + MemFile* file = new MemFile(MemFile::WRITE); + file->Ref(); + file_map_[fname] = file; + + result->reset(new WritableFileImpl(file)); + return Status::OK(); + } + + virtual Status NewRandomRWFile(const std::string& fname, + unique_ptr* result, + const EnvOptions& options) { + return Status::OK(); + } + + virtual Status NewDirectory(const std::string& name, + unique_ptr* result) { + result->reset(new TestMemDirectory()); + return Status::OK(); + } + + virtual bool FileExists(const std::string& fname) { + MutexLock lock(&mutex_); + return file_map_.find(fname) != file_map_.end(); + } + + virtual Status GetChildren(const std::string& dir, + std::vector* result) { + MutexLock lock(&mutex_); + result->clear(); + + for (FileSystem::iterator i = file_map_.begin(); i != file_map_.end(); ++i){ + const std::string& filename = i->first; + + if (filename.size() >= dir.size() + 1 && filename[dir.size()] == '/' && + Slice(filename).starts_with(Slice(dir))) { + result->push_back(filename.substr(dir.size() + 1)); + } + } + + return Status::OK(); + } + + void DeleteFileInternal(const std::string& fname) { + if (file_map_.find(fname) == file_map_.end()) { + return; + } + + file_map_[fname]->Unref(); + file_map_.erase(fname); + } + + virtual Status DeleteFile(const std::string& fname) { + MutexLock lock(&mutex_); + if (file_map_.find(fname) == file_map_.end()) { + return Status::IOError(fname, "File not found"); + } + + DeleteFileInternal(fname); + return Status::OK(); + } + + virtual Status CreateDir(const std::string& dirname) { + return Status::OK(); + } + + virtual Status CreateDirIfMissing(const std::string& dirname) { + return Status::OK(); + } + + virtual Status DeleteDir(const std::string& dirname) { + return Status::OK(); + } + + virtual Status GetFileSize(const std::string& fname, uint64_t* file_size) { + MutexLock lock(&mutex_); + if (file_map_.find(fname) == file_map_.end()) { + return Status::IOError(fname, "File not found"); + } + + *file_size = file_map_[fname]->Size(); + return Status::OK(); + } + + virtual Status GetFileModificationTime(const std::string& fname, + uint64_t* time) { + return Status::NotSupported("getFileMTime", "Not supported in MemEnv"); + } + + virtual Status RenameFile(const std::string& src, + const std::string& target) { + MutexLock lock(&mutex_); + if (file_map_.find(src) == file_map_.end()) { + return Status::IOError(src, "File not found"); + } + + DeleteFileInternal(target); + file_map_[target] = file_map_[src]; + file_map_.erase(src); + return Status::OK(); + } + + virtual Status LockFile(const std::string& fname, FileLock** lock) { + *lock = new FileLock; + return Status::OK(); + } + + virtual Status UnlockFile(FileLock* lock) { + delete lock; + return Status::OK(); + } + + virtual Status GetTestDirectory(std::string* path) { + *path = "/test"; + return Status::OK(); + } + + private: + // Map from filenames to MemFile objects, representing a simple file system. + typedef std::map FileSystem; + port::Mutex mutex_; + FileSystem file_map_; // Protected by mutex_. +}; + +} // namespace + +Env* NewTestMemEnv(Env* base_env) { + return new TestMemEnv(base_env); +} + +} // namespace rocksdb diff --git a/util/env_mem_test.cc b/util/env_mem_test.cc new file mode 100644 index 000000000..ea3ed61a0 --- /dev/null +++ b/util/env_mem_test.cc @@ -0,0 +1,231 @@ +// 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 "db/db_impl.h" +#include "rocksdb/db.h" +#include "rocksdb/env.h" +#include "util/testharness.h" +#include +#include +#include + +namespace rocksdb { + +class MemEnvTest { + public: + Env* env_; + const EnvOptions soptions_; + + MemEnvTest() + : env_(NewMemEnv(Env::Default())) { + } + ~MemEnvTest() { + delete env_; + } +}; + +TEST(MemEnvTest, Basics) { + uint64_t file_size; + unique_ptr writable_file; + std::vector children; + + ASSERT_OK(env_->CreateDir("/dir")); + + // Check that the directory is empty. + ASSERT_TRUE(!env_->FileExists("/dir/non_existent")); + ASSERT_TRUE(!env_->GetFileSize("/dir/non_existent", &file_size).ok()); + ASSERT_OK(env_->GetChildren("/dir", &children)); + ASSERT_EQ(0U, children.size()); + + // Create a file. + ASSERT_OK(env_->NewWritableFile("/dir/f", &writable_file, soptions_)); + writable_file.reset(); + + // Check that the file exists. + ASSERT_TRUE(env_->FileExists("/dir/f")); + ASSERT_OK(env_->GetFileSize("/dir/f", &file_size)); + ASSERT_EQ(0U, file_size); + ASSERT_OK(env_->GetChildren("/dir", &children)); + ASSERT_EQ(1U, children.size()); + ASSERT_EQ("f", children[0]); + + // Write to the file. + ASSERT_OK(env_->NewWritableFile("/dir/f", &writable_file, soptions_)); + ASSERT_OK(writable_file->Append("abc")); + writable_file.reset(); + + // Check for expected size. + ASSERT_OK(env_->GetFileSize("/dir/f", &file_size)); + ASSERT_EQ(3U, file_size); + + // Check that renaming works. + ASSERT_TRUE(!env_->RenameFile("/dir/non_existent", "/dir/g").ok()); + ASSERT_OK(env_->RenameFile("/dir/f", "/dir/g")); + ASSERT_TRUE(!env_->FileExists("/dir/f")); + ASSERT_TRUE(env_->FileExists("/dir/g")); + ASSERT_OK(env_->GetFileSize("/dir/g", &file_size)); + ASSERT_EQ(3U, file_size); + + // Check that opening non-existent file fails. + unique_ptr seq_file; + unique_ptr rand_file; + ASSERT_TRUE(!env_->NewSequentialFile("/dir/non_existent", &seq_file, + soptions_).ok()); + ASSERT_TRUE(!seq_file); + ASSERT_TRUE(!env_->NewRandomAccessFile("/dir/non_existent", &rand_file, + soptions_).ok()); + ASSERT_TRUE(!rand_file); + + // Check that deleting works. + ASSERT_TRUE(!env_->DeleteFile("/dir/non_existent").ok()); + ASSERT_OK(env_->DeleteFile("/dir/g")); + ASSERT_TRUE(!env_->FileExists("/dir/g")); + ASSERT_OK(env_->GetChildren("/dir", &children)); + ASSERT_EQ(0U, children.size()); + ASSERT_OK(env_->DeleteDir("/dir")); +} + +TEST(MemEnvTest, ReadWrite) { + unique_ptr writable_file; + unique_ptr seq_file; + unique_ptr rand_file; + Slice result; + char scratch[100]; + + ASSERT_OK(env_->CreateDir("/dir")); + + ASSERT_OK(env_->NewWritableFile("/dir/f", &writable_file, soptions_)); + ASSERT_OK(writable_file->Append("hello ")); + ASSERT_OK(writable_file->Append("world")); + writable_file.reset(); + + // Read sequentially. + ASSERT_OK(env_->NewSequentialFile("/dir/f", &seq_file, soptions_)); + ASSERT_OK(seq_file->Read(5, &result, scratch)); // Read "hello". + ASSERT_EQ(0, result.compare("hello")); + ASSERT_OK(seq_file->Skip(1)); + ASSERT_OK(seq_file->Read(1000, &result, scratch)); // Read "world". + ASSERT_EQ(0, result.compare("world")); + ASSERT_OK(seq_file->Read(1000, &result, scratch)); // Try reading past EOF. + ASSERT_EQ(0U, result.size()); + ASSERT_OK(seq_file->Skip(100)); // Try to skip past end of file. + ASSERT_OK(seq_file->Read(1000, &result, scratch)); + ASSERT_EQ(0U, result.size()); + + // Random reads. + ASSERT_OK(env_->NewRandomAccessFile("/dir/f", &rand_file, soptions_)); + ASSERT_OK(rand_file->Read(6, 5, &result, scratch)); // Read "world". + ASSERT_EQ(0, result.compare("world")); + ASSERT_OK(rand_file->Read(0, 5, &result, scratch)); // Read "hello". + ASSERT_EQ(0, result.compare("hello")); + ASSERT_OK(rand_file->Read(10, 100, &result, scratch)); // Read "d". + ASSERT_EQ(0, result.compare("d")); + + // Too high offset. + ASSERT_TRUE(!rand_file->Read(1000, 5, &result, scratch).ok()); +} + +TEST(MemEnvTest, Locks) { + FileLock* lock; + + // These are no-ops, but we test they return success. + ASSERT_OK(env_->LockFile("some file", &lock)); + ASSERT_OK(env_->UnlockFile(lock)); +} + +TEST(MemEnvTest, Misc) { + std::string test_dir; + ASSERT_OK(env_->GetTestDirectory(&test_dir)); + ASSERT_TRUE(!test_dir.empty()); + + unique_ptr writable_file; + ASSERT_OK(env_->NewWritableFile("/a/b", &writable_file, soptions_)); + + // These are no-ops, but we test they return success. + ASSERT_OK(writable_file->Sync()); + ASSERT_OK(writable_file->Flush()); + ASSERT_OK(writable_file->Close()); + writable_file.reset(); +} + +TEST(MemEnvTest, LargeWrite) { + const size_t kWriteSize = 300 * 1024; + char* scratch = new char[kWriteSize * 2]; + + std::string write_data; + for (size_t i = 0; i < kWriteSize; ++i) { + write_data.append(1, static_cast(i)); + } + + unique_ptr writable_file; + ASSERT_OK(env_->NewWritableFile("/dir/f", &writable_file, soptions_)); + ASSERT_OK(writable_file->Append("foo")); + ASSERT_OK(writable_file->Append(write_data)); + writable_file.reset(); + + unique_ptr seq_file; + Slice result; + ASSERT_OK(env_->NewSequentialFile("/dir/f", &seq_file, soptions_)); + ASSERT_OK(seq_file->Read(3, &result, scratch)); // Read "foo". + ASSERT_EQ(0, result.compare("foo")); + + size_t read = 0; + std::string read_data; + while (read < kWriteSize) { + ASSERT_OK(seq_file->Read(kWriteSize - read, &result, scratch)); + read_data.append(result.data(), result.size()); + read += result.size(); + } + ASSERT_TRUE(write_data == read_data); + delete [] scratch; +} + +TEST(MemEnvTest, DBTest) { + Options options; + options.create_if_missing = true; + options.env = env_; + DB* db; + + const Slice keys[] = {Slice("aaa"), Slice("bbb"), Slice("ccc")}; + const Slice vals[] = {Slice("foo"), Slice("bar"), Slice("baz")}; + + ASSERT_OK(DB::Open(options, "/dir/db", &db)); + for (size_t i = 0; i < 3; ++i) { + ASSERT_OK(db->Put(WriteOptions(), keys[i], vals[i])); + } + + for (size_t i = 0; i < 3; ++i) { + std::string res; + ASSERT_OK(db->Get(ReadOptions(), keys[i], &res)); + ASSERT_TRUE(res == vals[i]); + } + + Iterator* iterator = db->NewIterator(ReadOptions()); + iterator->SeekToFirst(); + for (size_t i = 0; i < 3; ++i) { + ASSERT_TRUE(iterator->Valid()); + ASSERT_TRUE(keys[i] == iterator->key()); + ASSERT_TRUE(vals[i] == iterator->value()); + iterator->Next(); + } + ASSERT_TRUE(!iterator->Valid()); + delete iterator; + + DBImpl* dbi = reinterpret_cast(db); + ASSERT_OK(dbi->TEST_FlushMemTable()); + + for (size_t i = 0; i < 3; ++i) { + std::string res; + ASSERT_OK(db->Get(ReadOptions(), keys[i], &res)); + ASSERT_TRUE(res == vals[i]); + } + + delete db; +} + +} // namespace rocksdb + +int main(int argc, char** argv) { + return rocksdb::test::RunAllTests(); +}