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rocksdb/util/file_util.cc

102 lines
2.9 KiB

// Copyright (c) 2011-present, Facebook, Inc. All rights reserved.
// This source code is licensed under the BSD-style license found in the
// LICENSE file in the root directory of this source tree. An additional grant
// of patent rights can be found in the PATENTS file in the same directory.
//
#include "util/file_util.h"
#include <string>
#include <algorithm>
#include "rocksdb/env.h"
#include "util/sst_file_manager_impl.h"
#include "util/file_reader_writer.h"
namespace rocksdb {
// Utility function to copy a file up to a specified length
Status CopyFile(Env* env, const std::string& source,
const std::string& destination, uint64_t size) {
const EnvOptions soptions;
Status s;
unique_ptr<SequentialFileReader> src_reader;
unique_ptr<WritableFileWriter> dest_writer;
{
unique_ptr<SequentialFile> srcfile;
s = env->NewSequentialFile(source, &srcfile, soptions);
unique_ptr<WritableFile> destfile;
if (s.ok()) {
s = env->NewWritableFile(destination, &destfile, soptions);
} else {
return s;
}
if (size == 0) {
// default argument means copy everything
if (s.ok()) {
s = env->GetFileSize(source, &size);
} else {
return s;
}
}
src_reader.reset(new SequentialFileReader(std::move(srcfile)));
dest_writer.reset(new WritableFileWriter(std::move(destfile), soptions));
}
char buffer[4096];
Slice slice;
while (size > 0) {
size_t bytes_to_read = std::min(sizeof(buffer), static_cast<size_t>(size));
if (s.ok()) {
s = src_reader->Read(bytes_to_read, &slice, buffer);
}
if (s.ok()) {
if (slice.size() == 0) {
return Status::Corruption("file too small");
}
s = dest_writer->Append(slice);
}
if (!s.ok()) {
return s;
}
size -= slice.size();
}
return Status::OK();
}
// Utility function to create a file with the provided contents
Status CreateFile(Env* env, const std::string& destination,
const std::string& contents) {
const EnvOptions soptions;
Status s;
unique_ptr<WritableFileWriter> dest_writer;
unique_ptr<WritableFile> destfile;
s = env->NewWritableFile(destination, &destfile, soptions);
if (!s.ok()) {
return s;
}
dest_writer.reset(new WritableFileWriter(std::move(destfile), soptions));
return dest_writer->Append(Slice(contents));
}
Status DeleteSSTFile(const ImmutableDBOptions* db_options,
const std::string& fname, uint32_t path_id) {
// TODO(tec): support sst_file_manager for multiple path_ids
#ifndef ROCKSDB_LITE
auto sfm =
static_cast<SstFileManagerImpl*>(db_options->sst_file_manager.get());
if (sfm && path_id == 0) {
return sfm->ScheduleFileDeletion(fname);
} else {
return db_options->env->DeleteFile(fname);
}
#else
// SstFileManager is not supported in ROCKSDB_LITE
return db_options->env->DeleteFile(fname);
#endif
}
} // namespace rocksdb