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+// Copyright (c) 2015, Red Hat, 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.
+
+#ifndef ROCKSDB_LITE
+
+#include "rocksdb/utilities/env_mirror.h"
+
+namespace rocksdb {
+
+// An implementation of Env that mirrors all work over two backend
+// Env's. This is useful for debugging purposes.
+class SequentialFileMirror : public SequentialFile {
+ public:
+ std::unique_ptr<SequentialFile> a_, b_;
+ std::string fname;
+ explicit SequentialFileMirror(std::string f) : fname(f) {}
+
+ Status Read(size_t n, Slice* result, char* scratch) override {
+ Slice aslice;
+ Status as = a_->Read(n, &aslice, scratch);
+ if (as == Status::OK()) {
+ char* bscratch = new char[n];
+ Slice bslice;
+ size_t off = 0;
+ size_t left = aslice.size();
+ while (left) {
+ Status bs = b_->Read(left, &bslice, bscratch);
+ assert(as == bs);
+ assert(memcmp(bscratch, scratch + off, bslice.size()) == 0);
+ off += bslice.size();
+ left -= bslice.size();
+ }
+ delete[] bscratch;
+ *result = aslice;
+ } else {
+ Status bs = b_->Read(n, result, scratch);
+ assert(as == bs);
+ }
+ return as;
+ }
+
+ Status Skip(uint64_t n) override {
+ Status as = a_->Skip(n);
+ Status bs = b_->Skip(n);
+ assert(as == bs);
+ return as;
+ }
+ Status InvalidateCache(size_t offset, size_t length) override {
+ Status as = a_->InvalidateCache(offset, length);
+ Status bs = b_->InvalidateCache(offset, length);
+ assert(as == bs);
+ return as;
+ };
+};
+
+class RandomAccessFileMirror : public RandomAccessFile {
+ public:
+ std::unique_ptr<RandomAccessFile> a_, b_;
+ std::string fname;
+ explicit RandomAccessFileMirror(std::string f) : fname(f) {}
+
+ Status Read(uint64_t offset, size_t n, Slice* result,
+ char* scratch) const override {
+ Status as = a_->Read(offset, n, result, scratch);
+ if (as == Status::OK()) {
+ char* bscratch = new char[n];
+ Slice bslice;
+ size_t off = 0;
+ size_t left = result->size();
+ while (left) {
+ Status bs = b_->Read(offset + off, left, &bslice, bscratch);
+ assert(as == bs);
+ assert(memcmp(bscratch, scratch + off, bslice.size()) == 0);
+ off += bslice.size();
+ left -= bslice.size();
+ }
+ delete[] bscratch;
+ } else {
+ Status bs = b_->Read(offset, n, result, scratch);
+ assert(as == bs);
+ }
+ return as;
+ }
+
+ size_t GetUniqueId(char* id, size_t max_size) const override {
+ // NOTE: not verified
+ return a_->GetUniqueId(id, max_size);
+ }
+};
+
+class WritableFileMirror : public WritableFile {
+ public:
+ std::unique_ptr<WritableFile> a_, b_;
+ std::string fname;
+ explicit WritableFileMirror(std::string f) : fname(f) {}
+
+ Status Append(const Slice& data) override {
+ Status as = a_->Append(data);
+ Status bs = b_->Append(data);
+ assert(as == bs);
+ return as;
+ }
+ Status PositionedAppend(const Slice& data, uint64_t offset) override {
+ Status as = a_->PositionedAppend(data, offset);
+ Status bs = b_->PositionedAppend(data, offset);
+ assert(as == bs);
+ return as;
+ }
+ Status Truncate(uint64_t size) override {
+ Status as = a_->Truncate(size);
+ Status bs = b_->Truncate(size);
+ assert(as == bs);
+ return as;
+ }
+ Status Close() override {
+ Status as = a_->Close();
+ Status bs = b_->Close();
+ assert(as == bs);
+ return as;
+ }
+ Status Flush() override {
+ Status as = a_->Flush();
+ Status bs = b_->Flush();
+ assert(as == bs);
+ return as;
+ }
+ Status Sync() override {
+ Status as = a_->Sync();
+ Status bs = b_->Sync();
+ assert(as == bs);
+ return as;
+ }
+ Status Fsync() override {
+ Status as = a_->Fsync();
+ Status bs = b_->Fsync();
+ assert(as == bs);
+ return as;
+ }
+ bool IsSyncThreadSafe() const override {
+ bool as = a_->IsSyncThreadSafe();
+ assert(as == b_->IsSyncThreadSafe());
+ return as;
+ }
+ void SetIOPriority(Env::IOPriority pri) override {
+ a_->SetIOPriority(pri);
+ b_->SetIOPriority(pri);
+ }
+ Env::IOPriority GetIOPriority() override {
+ // NOTE: we don't verify this one
+ return a_->GetIOPriority();
+ }
+ uint64_t GetFileSize() override {
+ uint64_t as = a_->GetFileSize();
+ assert(as == b_->GetFileSize());
+ return as;
+ }
+ void GetPreallocationStatus(size_t* block_size,
+ size_t* last_allocated_block) override {
+ // NOTE: we don't verify this one
+ return a_->GetPreallocationStatus(block_size, last_allocated_block);
+ }
+ size_t GetUniqueId(char* id, size_t max_size) const override {
+ // NOTE: we don't verify this one
+ return a_->GetUniqueId(id, max_size);
+ }
+ Status InvalidateCache(size_t offset, size_t length) override {
+ Status as = a_->InvalidateCache(offset, length);
+ Status bs = b_->InvalidateCache(offset, length);
+ assert(as == bs);
+ return as;
+ }
+
+ protected:
+ Status Allocate(uint64_t offset, uint64_t length) override {
+ Status as = a_->Allocate(offset, length);
+ Status bs = b_->Allocate(offset, length);
+ assert(as == bs);
+ return as;
+ }
+ Status RangeSync(uint64_t offset, uint64_t nbytes) override {
+ Status as = a_->RangeSync(offset, nbytes);
+ Status bs = b_->RangeSync(offset, nbytes);
+ assert(as == bs);
+ return as;
+ }
+};
+
+Status EnvMirror::NewSequentialFile(const std::string& f,
+ std::unique_ptr<SequentialFile>* r,
+ const EnvOptions& options) {
+ if (f.find("/proc/") == 0) {
+ return a_->NewSequentialFile(f, r, options);
+ }
+ SequentialFileMirror* mf = new SequentialFileMirror(f);
+ Status as = a_->NewSequentialFile(f, &mf->a_, options);
+ Status bs = b_->NewSequentialFile(f, &mf->b_, options);
+ assert(as == bs);
+ if (as.ok())
+ r->reset(mf);
+ else
+ delete mf;
+ return as;
+}
+
+Status EnvMirror::NewRandomAccessFile(const std::string& f,
+ std::unique_ptr<RandomAccessFile>* r,
+ const EnvOptions& options) {
+ if (f.find("/proc/") == 0) {
+ return a_->NewRandomAccessFile(f, r, options);
+ }
+ RandomAccessFileMirror* mf = new RandomAccessFileMirror(f);
+ Status as = a_->NewRandomAccessFile(f, &mf->a_, options);
+ Status bs = b_->NewRandomAccessFile(f, &mf->b_, options);
+ assert(as == bs);
+ if (as.ok())
+ r->reset(mf);
+ else
+ delete mf;
+ return as;
+}
+
+Status EnvMirror::NewWritableFile(const std::string& f,
+ std::unique_ptr<WritableFile>* r,
+ const EnvOptions& options) {
+ if (f.find("/proc/") == 0) return a_->NewWritableFile(f, r, options);
+ WritableFileMirror* mf = new WritableFileMirror(f);
+ Status as = a_->NewWritableFile(f, &mf->a_, options);
+ Status bs = b_->NewWritableFile(f, &mf->b_, options);
+ assert(as == bs);
+ if (as.ok())
+ r->reset(mf);
+ else
+ delete mf;
+ return as;
+}
+
+Status EnvMirror::ReuseWritableFile(const std::string& fname,
+ const std::string& old_fname,
+ std::unique_ptr<WritableFile>* r,
+ const EnvOptions& options) {
+ if (fname.find("/proc/") == 0)
+ return a_->ReuseWritableFile(fname, old_fname, r, options);
+ WritableFileMirror* mf = new WritableFileMirror(fname);
+ Status as = a_->ReuseWritableFile(fname, old_fname, &mf->a_, options);
+ Status bs = b_->ReuseWritableFile(fname, old_fname, &mf->b_, options);
+ assert(as == bs);
+ if (as.ok())
+ r->reset(mf);
+ else
+ delete mf;
+ return as;
+}
+
+} // namespace rocksdb
+#endif
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