1 files changed, 133 insertions, 0 deletions
diff --git a/src/rocksdb/utilities/trace/file_trace_reader_writer.cc b/src/rocksdb/utilities/trace/file_trace_reader_writer.cc
new file mode 100644
index 000000000..5886d3539
--- /dev/null
+++ b/src/rocksdb/utilities/trace/file_trace_reader_writer.cc
@@ -0,0 +1,133 @@
+//  Copyright (c) 2011-present, Facebook, 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).
+
+#include "utilities/trace/file_trace_reader_writer.h"
+
+#include "env/composite_env_wrapper.h"
+#include "file/random_access_file_reader.h"
+#include "file/writable_file_writer.h"
+#include "trace_replay/trace_replay.h"
+#include "util/coding.h"
+
+namespace ROCKSDB_NAMESPACE {
+
+const unsigned int FileTraceReader::kBufferSize = 1024;  // 1KB
+
+FileTraceReader::FileTraceReader(
+    std::unique_ptr<RandomAccessFileReader>&& reader)
+    : file_reader_(std::move(reader)),
+      offset_(0),
+      buffer_(new char[kBufferSize]) {}
+
+FileTraceReader::~FileTraceReader() {
+  Close().PermitUncheckedError();
+  delete[] buffer_;
+}
+
+Status FileTraceReader::Close() {
+  file_reader_.reset();
+  return Status::OK();
+}
+
+Status FileTraceReader::Reset() {
+  if (file_reader_ == nullptr) {
+    return Status::IOError("TraceReader is closed.");
+  }
+  offset_ = 0;
+  return Status::OK();
+}
+
+Status FileTraceReader::Read(std::string* data) {
+  assert(file_reader_ != nullptr);
+  Status s = file_reader_->Read(IOOptions(), offset_, kTraceMetadataSize,
+                                &result_, buffer_, nullptr,
+                                Env::IO_TOTAL /* rate_limiter_priority */);
+  if (!s.ok()) {
+    return s;
+  }
+  if (result_.size() == 0) {
+    // No more data to read
+    // Todo: Come up with a better way to indicate end of data. May be this
+    // could be avoided once footer is introduced.
+    return Status::Incomplete();
+  }
+  if (result_.size() < kTraceMetadataSize) {
+    return Status::Corruption("Corrupted trace file.");
+  }
+  *data = result_.ToString();
+  offset_ += kTraceMetadataSize;
+
+  uint32_t payload_len =
+      DecodeFixed32(&buffer_[kTraceTimestampSize + kTraceTypeSize]);
+
+  // Read Payload
+  unsigned int bytes_to_read = payload_len;
+  unsigned int to_read =
+      bytes_to_read > kBufferSize ? kBufferSize : bytes_to_read;
+  while (to_read > 0) {
+    s = file_reader_->Read(IOOptions(), offset_, to_read, &result_, buffer_,
+                           nullptr, Env::IO_TOTAL /* rate_limiter_priority */);
+    if (!s.ok()) {
+      return s;
+    }
+    if (result_.size() < to_read) {
+      return Status::Corruption("Corrupted trace file.");
+    }
+    data->append(result_.data(), result_.size());
+
+    offset_ += to_read;
+    bytes_to_read -= to_read;
+    to_read = bytes_to_read > kBufferSize ? kBufferSize : bytes_to_read;
+  }
+
+  return s;
+}
+
+FileTraceWriter::FileTraceWriter(
+    std::unique_ptr<WritableFileWriter>&& file_writer)
+    : file_writer_(std::move(file_writer)) {}
+
+FileTraceWriter::~FileTraceWriter() { Close().PermitUncheckedError(); }
+
+Status FileTraceWriter::Close() {
+  file_writer_.reset();
+  return Status::OK();
+}
+
+Status FileTraceWriter::Write(const Slice& data) {
+  return file_writer_->Append(data);
+}
+
+uint64_t FileTraceWriter::GetFileSize() { return file_writer_->GetFileSize(); }
+
+Status NewFileTraceReader(Env* env, const EnvOptions& env_options,
+                          const std::string& trace_filename,
+                          std::unique_ptr<TraceReader>* trace_reader) {
+  std::unique_ptr<RandomAccessFileReader> file_reader;
+  Status s = RandomAccessFileReader::Create(
+      env->GetFileSystem(), trace_filename, FileOptions(env_options),
+      &file_reader, nullptr);
+  if (!s.ok()) {
+    return s;
+  }
+  trace_reader->reset(new FileTraceReader(std::move(file_reader)));
+  return s;
+}
+
+Status NewFileTraceWriter(Env* env, const EnvOptions& env_options,
+                          const std::string& trace_filename,
+                          std::unique_ptr<TraceWriter>* trace_writer) {
+  std::unique_ptr<WritableFileWriter> file_writer;
+  Status s = WritableFileWriter::Create(env->GetFileSystem(), trace_filename,
+                                        FileOptions(env_options), &file_writer,
+                                        nullptr);
+  if (!s.ok()) {
+    return s;
+  }
+  trace_writer->reset(new FileTraceWriter(std::move(file_writer)));
+  return s;
+}
+
+}  // namespace ROCKSDB_NAMESPACE