mirror of https://github.com/facebook/rocksdb.git
115 lines
3.3 KiB
C++
115 lines
3.3 KiB
C++
// Copyright (c) 2011-present, Facebook, Inc. All rights reserved.
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// This source code is licensed under both the GPLv2 (found in the
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// COPYING file in the root directory) and Apache 2.0 License
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// (found in the LICENSE.Apache file in the root 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 "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, bool use_fsync) {
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const EnvOptions soptions;
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Status s;
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std::unique_ptr<SequentialFileReader> src_reader;
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std::unique_ptr<WritableFileWriter> dest_writer;
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{
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std::unique_ptr<SequentialFile> srcfile;
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s = env->NewSequentialFile(source, &srcfile, soptions);
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if (!s.ok()) {
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return s;
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}
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std::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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if (size == 0) {
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// default argument means copy everything
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s = env->GetFileSize(source, &size);
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if (!s.ok()) {
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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), source));
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dest_writer.reset(
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new WritableFileWriter(std::move(destfile), destination, 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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s = src_reader->Read(bytes_to_read, &slice, buffer);
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if (!s.ok()) {
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return s;
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}
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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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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 dest_writer->Sync(use_fsync);
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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, bool use_fsync) {
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const EnvOptions soptions;
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Status s;
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std::unique_ptr<WritableFileWriter> dest_writer;
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std::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(
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new WritableFileWriter(std::move(destfile), destination, soptions));
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s = dest_writer->Append(Slice(contents));
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if (!s.ok()) {
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return s;
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}
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return dest_writer->Sync(use_fsync);
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}
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Status DeleteSSTFile(const ImmutableDBOptions* db_options,
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const std::string& fname, const std::string& dir_to_sync) {
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return DeleteDBFile(db_options, fname, dir_to_sync, false);
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}
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Status DeleteDBFile(const ImmutableDBOptions* db_options,
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const std::string& fname, const std::string& dir_to_sync,
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const bool force_bg) {
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#ifndef ROCKSDB_LITE
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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) {
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return sfm->ScheduleFileDeletion(fname, dir_to_sync, force_bg);
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} else {
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return db_options->env->DeleteFile(fname);
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}
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#else
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(void)dir_to_sync;
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(void)force_bg;
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// SstFileManager is not supported in ROCKSDB_LITE
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return db_options->env->DeleteFile(fname);
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#endif
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}
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} // namespace rocksdb
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