mirror of https://github.com/facebook/rocksdb.git
98 lines
2.8 KiB
C++
98 lines
2.8 KiB
C++
// Copyright (c) 2011-present, Facebook, 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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//
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#include "util/file_util.h"
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#include <string>
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#include <algorithm>
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#include "rocksdb/env.h"
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#include "rocksdb/options.h"
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#include "util/sst_file_manager_impl.h"
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#include "util/file_reader_writer.h"
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namespace rocksdb {
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// Utility function to copy a file up to a specified length
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Status CopyFile(Env* env, const std::string& source,
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const std::string& destination, uint64_t size) {
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const EnvOptions soptions;
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Status s;
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unique_ptr<SequentialFileReader> src_reader;
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unique_ptr<WritableFileWriter> dest_writer;
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{
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unique_ptr<SequentialFile> srcfile;
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s = env->NewSequentialFile(source, &srcfile, soptions);
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unique_ptr<WritableFile> destfile;
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if (s.ok()) {
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s = env->NewWritableFile(destination, &destfile, soptions);
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} else {
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return s;
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}
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if (size == 0) {
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// default argument means copy everything
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if (s.ok()) {
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s = env->GetFileSize(source, &size);
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} else {
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return s;
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}
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}
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src_reader.reset(new SequentialFileReader(std::move(srcfile)));
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dest_writer.reset(new WritableFileWriter(std::move(destfile), soptions));
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}
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char buffer[4096];
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Slice slice;
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while (size > 0) {
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size_t bytes_to_read = std::min(sizeof(buffer), static_cast<size_t>(size));
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if (s.ok()) {
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s = src_reader->Read(bytes_to_read, &slice, buffer);
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}
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if (s.ok()) {
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if (slice.size() == 0) {
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return Status::Corruption("file too small");
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}
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s = dest_writer->Append(slice);
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}
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if (!s.ok()) {
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return s;
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}
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size -= slice.size();
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}
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return Status::OK();
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}
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// Utility function to create a file with the provided contents
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Status CreateFile(Env* env, const std::string& destination,
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const std::string& contents) {
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const EnvOptions soptions;
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Status s;
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unique_ptr<WritableFileWriter> dest_writer;
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unique_ptr<WritableFile> destfile;
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s = env->NewWritableFile(destination, &destfile, soptions);
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if (!s.ok()) {
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return s;
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}
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dest_writer.reset(new WritableFileWriter(std::move(destfile), soptions));
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return dest_writer->Append(Slice(contents));
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}
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Status DeleteSSTFile(const DBOptions* db_options, const std::string& fname,
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uint32_t path_id) {
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// TODO(tec): support sst_file_manager for multiple path_ids
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auto sfm =
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static_cast<SstFileManagerImpl*>(db_options->sst_file_manager.get());
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if (sfm && path_id == 0) {
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return sfm->ScheduleFileDeletion(fname);
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} else {
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return db_options->env->DeleteFile(fname);
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}
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}
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} // namespace rocksdb
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