mirror of https://github.com/facebook/rocksdb.git
133 lines
4.0 KiB
C++
133 lines
4.0 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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#include "utilities/trace/file_trace_reader_writer.h"
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#include "env/composite_env_wrapper.h"
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#include "file/random_access_file_reader.h"
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#include "file/writable_file_writer.h"
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#include "trace_replay/trace_replay.h"
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#include "util/coding.h"
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namespace ROCKSDB_NAMESPACE {
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const unsigned int FileTraceReader::kBufferSize = 1024; // 1KB
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FileTraceReader::FileTraceReader(
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std::unique_ptr<RandomAccessFileReader>&& reader)
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: file_reader_(std::move(reader)),
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offset_(0),
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buffer_(new char[kBufferSize]) {}
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FileTraceReader::~FileTraceReader() {
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Close().PermitUncheckedError();
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delete[] buffer_;
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}
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Status FileTraceReader::Close() {
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file_reader_.reset();
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return Status::OK();
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}
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Status FileTraceReader::Reset() {
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if (file_reader_ == nullptr) {
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return Status::IOError("TraceReader is closed.");
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}
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offset_ = 0;
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return Status::OK();
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}
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Status FileTraceReader::Read(std::string* data) {
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assert(file_reader_ != nullptr);
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Status s = file_reader_->Read(IOOptions(), offset_, kTraceMetadataSize,
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&result_, buffer_, nullptr);
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if (!s.ok()) {
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return s;
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}
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if (result_.size() == 0) {
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// No more data to read
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// Todo: Come up with a better way to indicate end of data. May be this
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// could be avoided once footer is introduced.
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return Status::Incomplete();
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}
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if (result_.size() < kTraceMetadataSize) {
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return Status::Corruption("Corrupted trace file.");
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}
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*data = result_.ToString();
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offset_ += kTraceMetadataSize;
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uint32_t payload_len =
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DecodeFixed32(&buffer_[kTraceTimestampSize + kTraceTypeSize]);
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// Read Payload
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unsigned int bytes_to_read = payload_len;
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unsigned int to_read =
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bytes_to_read > kBufferSize ? kBufferSize : bytes_to_read;
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while (to_read > 0) {
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s = file_reader_->Read(IOOptions(), offset_, to_read, &result_, buffer_,
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nullptr);
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if (!s.ok()) {
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return s;
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}
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if (result_.size() < to_read) {
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return Status::Corruption("Corrupted trace file.");
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}
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data->append(result_.data(), result_.size());
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offset_ += to_read;
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bytes_to_read -= to_read;
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to_read = bytes_to_read > kBufferSize ? kBufferSize : bytes_to_read;
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}
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return s;
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}
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FileTraceWriter::FileTraceWriter(
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std::unique_ptr<WritableFileWriter>&& file_writer)
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: file_writer_(std::move(file_writer)) {}
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FileTraceWriter::~FileTraceWriter() { Close().PermitUncheckedError(); }
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Status FileTraceWriter::Close() {
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file_writer_.reset();
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return Status::OK();
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}
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Status FileTraceWriter::Write(const Slice& data) {
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return file_writer_->Append(data);
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}
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uint64_t FileTraceWriter::GetFileSize() { return file_writer_->GetFileSize(); }
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Status NewFileTraceReader(Env* env, const EnvOptions& env_options,
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const std::string& trace_filename,
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std::unique_ptr<TraceReader>* trace_reader) {
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std::unique_ptr<RandomAccessFileReader> file_reader;
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Status s = RandomAccessFileReader::Create(
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env->GetFileSystem(), trace_filename, FileOptions(env_options),
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&file_reader, nullptr);
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if (!s.ok()) {
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return s;
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}
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trace_reader->reset(new FileTraceReader(std::move(file_reader)));
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return s;
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}
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Status NewFileTraceWriter(Env* env, const EnvOptions& env_options,
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const std::string& trace_filename,
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std::unique_ptr<TraceWriter>* trace_writer) {
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std::unique_ptr<WritableFileWriter> file_writer;
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Status s = WritableFileWriter::Create(env->GetFileSystem(), trace_filename,
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FileOptions(env_options), &file_writer,
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nullptr);
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if (!s.ok()) {
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return s;
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}
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trace_writer->reset(new FileTraceWriter(std::move(file_writer)));
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return s;
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}
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} // namespace ROCKSDB_NAMESPACE
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