mirror of https://github.com/facebook/rocksdb.git
265 lines
7.8 KiB
C++
265 lines
7.8 KiB
C++
// Copyright (c) 2015, Red Hat, Inc. All rights reserved.
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// This source code is licensed under the BSD-style license found in the
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// LICENSE file in the root directory of this source tree. An additional grant
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// of patent rights can be found in the PATENTS file in the same directory.
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// Copyright (c) 2011 The LevelDB Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file. See the AUTHORS file for names of contributors.
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#ifndef ROCKSDB_LITE
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#include "rocksdb/utilities/env_mirror.h"
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namespace rocksdb {
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// An implementaiton of Env that mirrors all work over two backend
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// Env's. This is useful for debugging purposes.
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class SequentialFileMirror : public SequentialFile {
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public:
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unique_ptr<SequentialFile> a_, b_;
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std::string fname;
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explicit SequentialFileMirror(std::string f) : fname(f) {}
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Status Read(size_t n, Slice* result, char* scratch) {
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Slice aslice;
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Status as = a_->Read(n, &aslice, scratch);
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if (as == Status::OK()) {
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char* bscratch = new char[n];
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Slice bslice;
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size_t off = 0;
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size_t left = aslice.size();
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while (left) {
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Status bs = b_->Read(left, &bslice, bscratch);
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assert(as == bs);
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assert(memcmp(bscratch, scratch + off, bslice.size()) == 0);
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off += bslice.size();
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left -= bslice.size();
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}
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delete[] bscratch;
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*result = aslice;
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} else {
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Status bs = b_->Read(n, result, scratch);
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assert(as == bs);
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}
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return as;
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}
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Status Skip(uint64_t n) {
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Status as = a_->Skip(n);
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Status bs = b_->Skip(n);
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assert(as == bs);
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return as;
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}
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Status InvalidateCache(size_t offset, size_t length) {
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Status as = a_->InvalidateCache(offset, length);
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Status bs = b_->InvalidateCache(offset, length);
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assert(as == bs);
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return as;
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};
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};
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class RandomAccessFileMirror : public RandomAccessFile {
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public:
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unique_ptr<RandomAccessFile> a_, b_;
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std::string fname;
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explicit RandomAccessFileMirror(std::string f) : fname(f) {}
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Status Read(uint64_t offset, size_t n, Slice* result, char* scratch) const {
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Status as = a_->Read(offset, n, result, scratch);
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if (as == Status::OK()) {
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char* bscratch = new char[n];
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Slice bslice;
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size_t off = 0;
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size_t left = result->size();
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while (left) {
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Status bs = b_->Read(offset + off, left, &bslice, bscratch);
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assert(as == bs);
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assert(memcmp(bscratch, scratch + off, bslice.size()) == 0);
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off += bslice.size();
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left -= bslice.size();
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}
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delete[] bscratch;
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} else {
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Status bs = b_->Read(offset, n, result, scratch);
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assert(as == bs);
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}
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return as;
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}
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bool ShouldForwardRawRequest() const {
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// NOTE: not verified
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return a_->ShouldForwardRawRequest();
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}
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size_t GetUniqueId(char* id, size_t max_size) const {
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// NOTE: not verified
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return a_->GetUniqueId(id, max_size);
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}
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};
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class WritableFileMirror : public WritableFile {
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public:
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unique_ptr<WritableFile> a_, b_;
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std::string fname;
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explicit WritableFileMirror(std::string f) : fname(f) {}
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Status Append(const Slice& data) override {
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Status as = a_->Append(data);
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Status bs = b_->Append(data);
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assert(as == bs);
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return as;
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}
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Status PositionedAppend(const Slice& data, uint64_t offset) override {
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Status as = a_->PositionedAppend(data, offset);
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Status bs = b_->PositionedAppend(data, offset);
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assert(as == bs);
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return as;
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}
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Status Truncate(uint64_t size) override {
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Status as = a_->Truncate(size);
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Status bs = b_->Truncate(size);
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assert(as == bs);
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return as;
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}
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Status Close() override {
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Status as = a_->Close();
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Status bs = b_->Close();
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assert(as == bs);
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return as;
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}
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Status Flush() override {
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Status as = a_->Flush();
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Status bs = b_->Flush();
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assert(as == bs);
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return as;
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}
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Status Sync() override {
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Status as = a_->Sync();
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Status bs = b_->Sync();
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assert(as == bs);
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return as;
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}
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Status Fsync() override {
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Status as = a_->Fsync();
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Status bs = b_->Fsync();
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assert(as == bs);
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return as;
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}
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bool IsSyncThreadSafe() const override {
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bool as = a_->IsSyncThreadSafe();
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assert(as == b_->IsSyncThreadSafe());
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return as;
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}
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void SetIOPriority(Env::IOPriority pri) override {
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a_->SetIOPriority(pri);
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b_->SetIOPriority(pri);
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}
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Env::IOPriority GetIOPriority() override {
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// NOTE: we don't verify this one
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return a_->GetIOPriority();
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}
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uint64_t GetFileSize() override {
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uint64_t as = a_->GetFileSize();
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assert(as == b_->GetFileSize());
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return as;
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}
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void GetPreallocationStatus(size_t* block_size,
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size_t* last_allocated_block) override {
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// NOTE: we don't verify this one
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return a_->GetPreallocationStatus(block_size, last_allocated_block);
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}
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size_t GetUniqueId(char* id, size_t max_size) const override {
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// NOTE: we don't verify this one
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return a_->GetUniqueId(id, max_size);
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}
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Status InvalidateCache(size_t offset, size_t length) override {
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Status as = a_->InvalidateCache(offset, length);
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Status bs = b_->InvalidateCache(offset, length);
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assert(as == bs);
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return as;
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}
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protected:
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Status Allocate(uint64_t offset, uint64_t length) override {
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Status as = a_->Allocate(offset, length);
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Status bs = b_->Allocate(offset, length);
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assert(as == bs);
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return as;
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}
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Status RangeSync(uint64_t offset, uint64_t nbytes) override {
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Status as = a_->RangeSync(offset, nbytes);
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Status bs = b_->RangeSync(offset, nbytes);
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assert(as == bs);
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return as;
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}
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};
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Status EnvMirror::NewSequentialFile(const std::string& f,
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unique_ptr<SequentialFile>* r,
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const EnvOptions& options) {
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if (f.find("/proc/") == 0) {
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return a_->NewSequentialFile(f, r, options);
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}
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SequentialFileMirror* mf = new SequentialFileMirror(f);
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Status as = a_->NewSequentialFile(f, &mf->a_, options);
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Status bs = b_->NewSequentialFile(f, &mf->b_, options);
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assert(as == bs);
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if (as.ok())
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r->reset(mf);
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else
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delete mf;
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return as;
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}
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Status EnvMirror::NewRandomAccessFile(const std::string& f,
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unique_ptr<RandomAccessFile>* r,
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const EnvOptions& options) {
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if (f.find("/proc/") == 0) {
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return a_->NewRandomAccessFile(f, r, options);
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}
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RandomAccessFileMirror* mf = new RandomAccessFileMirror(f);
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Status as = a_->NewRandomAccessFile(f, &mf->a_, options);
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Status bs = b_->NewRandomAccessFile(f, &mf->b_, options);
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assert(as == bs);
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if (as.ok())
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r->reset(mf);
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else
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delete mf;
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return as;
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}
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Status EnvMirror::NewWritableFile(const std::string& f,
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unique_ptr<WritableFile>* r,
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const EnvOptions& options) {
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if (f.find("/proc/") == 0) return a_->NewWritableFile(f, r, options);
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WritableFileMirror* mf = new WritableFileMirror(f);
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Status as = a_->NewWritableFile(f, &mf->a_, options);
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Status bs = b_->NewWritableFile(f, &mf->b_, options);
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assert(as == bs);
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if (as.ok())
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r->reset(mf);
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else
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delete mf;
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return as;
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}
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Status EnvMirror::ReuseWritableFile(const std::string& fname,
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const std::string& old_fname,
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unique_ptr<WritableFile>* r,
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const EnvOptions& options) {
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if (fname.find("/proc/") == 0)
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return a_->ReuseWritableFile(fname, old_fname, r, options);
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WritableFileMirror* mf = new WritableFileMirror(fname);
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Status as = a_->ReuseWritableFile(fname, old_fname, &mf->a_, options);
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Status bs = b_->ReuseWritableFile(fname, old_fname, &mf->b_, options);
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assert(as == bs);
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if (as.ok())
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r->reset(mf);
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else
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delete mf;
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return as;
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}
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} // namespace rocksdb
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#endif
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