From 58841ef12f6cba1bb622353c1fcaa0e3c6fb46c9 Mon Sep 17 00:00:00 2001 From: Ilya Zhuravlev Date: Tue, 23 Oct 2012 01:18:44 +0400 Subject: Add dummy and LevelDB database backends --- src/leveldb/helpers/memenv/memenv.cc | 384 ++++++++++++++++++++++++++++++ src/leveldb/helpers/memenv/memenv.h | 20 ++ src/leveldb/helpers/memenv/memenv_test.cc | 232 ++++++++++++++++++ 3 files changed, 636 insertions(+) create mode 100644 src/leveldb/helpers/memenv/memenv.cc create mode 100644 src/leveldb/helpers/memenv/memenv.h create mode 100644 src/leveldb/helpers/memenv/memenv_test.cc (limited to 'src/leveldb/helpers') diff --git a/src/leveldb/helpers/memenv/memenv.cc b/src/leveldb/helpers/memenv/memenv.cc new file mode 100644 index 000000000..5879de121 --- /dev/null +++ b/src/leveldb/helpers/memenv/memenv.cc @@ -0,0 +1,384 @@ +// 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 "helpers/memenv/memenv.h" + +#include "leveldb/env.h" +#include "leveldb/status.h" +#include "port/port.h" +#include "util/mutexlock.h" +#include +#include +#include +#include + +namespace leveldb { + +namespace { + +class FileState { + public: + // FileStates are reference counted. The initial reference count is zero + // and the caller must call Ref() at least once. + FileState() : refs_(0), size_(0) {} + + // Increase the reference count. + void Ref() { + MutexLock lock(&refs_mutex_); + ++refs_; + } + + // Decrease the reference count. Delete if this is the last reference. + void Unref() { + bool do_delete = false; + + { + MutexLock lock(&refs_mutex_); + --refs_; + assert(refs_ >= 0); + if (refs_ <= 0) { + do_delete = true; + } + } + + if (do_delete) { + delete this; + } + } + + uint64_t Size() const { return size_; } + + Status Read(uint64_t offset, size_t n, Slice* result, char* scratch) const { + 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(); + } + + size_t block = offset / kBlockSize; + size_t block_offset = offset % kBlockSize; + + if (n <= kBlockSize - block_offset) { + // The requested bytes are all in the first block. + *result = Slice(blocks_[block] + block_offset, n); + return Status::OK(); + } + + size_t bytes_to_copy = n; + char* dst = scratch; + + while (bytes_to_copy > 0) { + size_t avail = kBlockSize - block_offset; + if (avail > bytes_to_copy) { + avail = bytes_to_copy; + } + memcpy(dst, blocks_[block] + block_offset, avail); + + bytes_to_copy -= avail; + dst += avail; + block++; + block_offset = 0; + } + + *result = Slice(scratch, n); + return Status::OK(); + } + + Status Append(const Slice& data) { + const char* src = data.data(); + size_t src_len = data.size(); + + while (src_len > 0) { + size_t avail; + size_t offset = size_ % kBlockSize; + + if (offset != 0) { + // There is some room in the last block. + avail = kBlockSize - offset; + } else { + // No room in the last block; push new one. + blocks_.push_back(new char[kBlockSize]); + avail = kBlockSize; + } + + if (avail > src_len) { + avail = src_len; + } + memcpy(blocks_.back() + offset, src, avail); + src_len -= avail; + src += avail; + size_ += avail; + } + + return Status::OK(); + } + + private: + // Private since only Unref() should be used to delete it. + ~FileState() { + for (std::vector::iterator i = blocks_.begin(); i != blocks_.end(); + ++i) { + delete [] *i; + } + } + + // No copying allowed. + FileState(const FileState&); + void operator=(const FileState&); + + port::Mutex refs_mutex_; + int refs_; // Protected by refs_mutex_; + + // The following fields are not protected by any mutex. They are only mutable + // while the file is being written, and concurrent access is not allowed + // to writable files. + std::vector blocks_; + uint64_t size_; + + enum { kBlockSize = 8 * 1024 }; +}; + +class SequentialFileImpl : public SequentialFile { + public: + explicit SequentialFileImpl(FileState* 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: + FileState* file_; + size_t pos_; +}; + +class RandomAccessFileImpl : public RandomAccessFile { + public: + explicit RandomAccessFileImpl(FileState* 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: + FileState* file_; +}; + +class WritableFileImpl : public WritableFile { + public: + WritableFileImpl(FileState* 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 Status::OK(); } + + private: + FileState* file_; +}; + +class NoOpLogger : public Logger { + public: + virtual void Logv(const char* format, va_list ap) { } +}; + +class InMemoryEnv : public EnvWrapper { + public: + explicit InMemoryEnv(Env* base_env) : EnvWrapper(base_env) { } + + virtual ~InMemoryEnv() { + 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, + SequentialFile** result) { + MutexLock lock(&mutex_); + if (file_map_.find(fname) == file_map_.end()) { + *result = NULL; + return Status::IOError(fname, "File not found"); + } + + *result = new SequentialFileImpl(file_map_[fname]); + return Status::OK(); + } + + virtual Status NewRandomAccessFile(const std::string& fname, + RandomAccessFile** result) { + MutexLock lock(&mutex_); + if (file_map_.find(fname) == file_map_.end()) { + *result = NULL; + return Status::IOError(fname, "File not found"); + } + + *result = new RandomAccessFileImpl(file_map_[fname]); + return Status::OK(); + } + + virtual Status NewWritableFile(const std::string& fname, + WritableFile** result) { + MutexLock lock(&mutex_); + if (file_map_.find(fname) != file_map_.end()) { + DeleteFileInternal(fname); + } + + FileState* file = new FileState(); + file->Ref(); + file_map_[fname] = file; + + *result = new WritableFileImpl(file); + 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 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 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(); + } + + virtual Status NewLogger(const std::string& fname, Logger** result) { + *result = new NoOpLogger; + return Status::OK(); + } + + private: + // Map from filenames to FileState objects, representing a simple file system. + typedef std::map FileSystem; + port::Mutex mutex_; + FileSystem file_map_; // Protected by mutex_. +}; + +} // namespace + +Env* NewMemEnv(Env* base_env) { + return new InMemoryEnv(base_env); +} + +} // namespace leveldb diff --git a/src/leveldb/helpers/memenv/memenv.h b/src/leveldb/helpers/memenv/memenv.h new file mode 100644 index 000000000..03b88de76 --- /dev/null +++ b/src/leveldb/helpers/memenv/memenv.h @@ -0,0 +1,20 @@ +// 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. + +#ifndef STORAGE_LEVELDB_HELPERS_MEMENV_MEMENV_H_ +#define STORAGE_LEVELDB_HELPERS_MEMENV_MEMENV_H_ + +namespace leveldb { + +class Env; + +// Returns a new environment that stores its data in memory and delegates +// all non-file-storage tasks to base_env. The caller must delete the result +// when it is no longer needed. +// *base_env must remain live while the result is in use. +Env* NewMemEnv(Env* base_env); + +} // namespace leveldb + +#endif // STORAGE_LEVELDB_HELPERS_MEMENV_MEMENV_H_ diff --git a/src/leveldb/helpers/memenv/memenv_test.cc b/src/leveldb/helpers/memenv/memenv_test.cc new file mode 100644 index 000000000..a44310fed --- /dev/null +++ b/src/leveldb/helpers/memenv/memenv_test.cc @@ -0,0 +1,232 @@ +// 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 "helpers/memenv/memenv.h" + +#include "db/db_impl.h" +#include "leveldb/db.h" +#include "leveldb/env.h" +#include "util/testharness.h" +#include +#include + +namespace leveldb { + +class MemEnvTest { + public: + Env* env_; + + MemEnvTest() + : env_(NewMemEnv(Env::Default())) { + } + ~MemEnvTest() { + delete env_; + } +}; + +TEST(MemEnvTest, Basics) { + uint64_t file_size; + WritableFile* 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(0, children.size()); + + // Create a file. + ASSERT_OK(env_->NewWritableFile("/dir/f", &writable_file)); + delete writable_file; + + // Check that the file exists. + ASSERT_TRUE(env_->FileExists("/dir/f")); + ASSERT_OK(env_->GetFileSize("/dir/f", &file_size)); + ASSERT_EQ(0, file_size); + ASSERT_OK(env_->GetChildren("/dir", &children)); + ASSERT_EQ(1, children.size()); + ASSERT_EQ("f", children[0]); + + // Write to the file. + ASSERT_OK(env_->NewWritableFile("/dir/f", &writable_file)); + ASSERT_OK(writable_file->Append("abc")); + delete writable_file; + + // Check for expected size. + ASSERT_OK(env_->GetFileSize("/dir/f", &file_size)); + ASSERT_EQ(3, 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(3, file_size); + + // Check that opening non-existent file fails. + SequentialFile* seq_file; + RandomAccessFile* rand_file; + ASSERT_TRUE(!env_->NewSequentialFile("/dir/non_existent", &seq_file).ok()); + ASSERT_TRUE(!seq_file); + ASSERT_TRUE(!env_->NewRandomAccessFile("/dir/non_existent", &rand_file).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(0, children.size()); + ASSERT_OK(env_->DeleteDir("/dir")); +} + +TEST(MemEnvTest, ReadWrite) { + WritableFile* writable_file; + SequentialFile* seq_file; + RandomAccessFile* rand_file; + Slice result; + char scratch[100]; + + ASSERT_OK(env_->CreateDir("/dir")); + + ASSERT_OK(env_->NewWritableFile("/dir/f", &writable_file)); + ASSERT_OK(writable_file->Append("hello ")); + ASSERT_OK(writable_file->Append("world")); + delete writable_file; + + // Read sequentially. + ASSERT_OK(env_->NewSequentialFile("/dir/f", &seq_file)); + 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(0, 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(0, result.size()); + delete seq_file; + + // Random reads. + ASSERT_OK(env_->NewRandomAccessFile("/dir/f", &rand_file)); + 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()); + delete rand_file; +} + +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()); + + WritableFile* writable_file; + ASSERT_OK(env_->NewWritableFile("/a/b", &writable_file)); + + // 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()); + delete writable_file; +} + +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)); + } + + WritableFile* writable_file; + ASSERT_OK(env_->NewWritableFile("/dir/f", &writable_file)); + ASSERT_OK(writable_file->Append("foo")); + ASSERT_OK(writable_file->Append(write_data)); + delete writable_file; + + SequentialFile* seq_file; + Slice result; + ASSERT_OK(env_->NewSequentialFile("/dir/f", &seq_file)); + 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 seq_file; + 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_CompactMemTable()); + + 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 leveldb + +int main(int argc, char** argv) { + return leveldb::test::RunAllTests(); +} -- cgit v1.2.3 opt">(os, GENERIC_CMD_UPDATE_ARMOR_GROUPS); writeU16(os, armor_groups.size()); for(ItemGroupList::const_iterator i = armor_groups.begin(); i != armor_groups.end(); i++){ os<<serializeString(i->first); writeS16(os, i->second); } return os.str(); } std::string gob_cmd_update_physics_override(float physics_override_speed, float physics_override_jump, float physics_override_gravity, bool sneak, bool sneak_glitch) { std::ostringstream os(std::ios::binary); // command writeU8(os, GENERIC_CMD_SET_PHYSICS_OVERRIDE); // parameters writeF1000(os, physics_override_speed); writeF1000(os, physics_override_jump); writeF1000(os, physics_override_gravity); // these are sent inverted so we get true when the server sends nothing writeU8(os, !sneak); writeU8(os, !sneak_glitch); return os.str(); } std::string gob_cmd_update_animation(v2f frames, float frame_speed, float frame_blend) { std::ostringstream os(std::ios::binary); // command writeU8(os, GENERIC_CMD_SET_ANIMATION); // parameters writeV2F1000(os, frames); writeF1000(os, frame_speed); writeF1000(os, frame_blend); return os.str(); } std::string gob_cmd_update_bone_position(std::string bone, v3f position, v3f rotation) { std::ostringstream os(std::ios::binary); // command writeU8(os, GENERIC_CMD_SET_BONE_POSITION); // parameters os<<serializeString(bone); writeV3F1000(os, position); writeV3F1000(os, rotation); return os.str(); } std::string gob_cmd_update_attachment(int parent_id, std::string bone, v3f position, v3f rotation) { std::ostringstream os(std::ios::binary); // command writeU8(os, GENERIC_CMD_SET_ATTACHMENT); // parameters writeS16(os, parent_id); os<<serializeString(bone); writeV3F1000(os, position); writeV3F1000(os, rotation); return os.str(); }
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