Delete the tracing service

services/service_manager/standalone/tracer.h

-// Copyright 2015 The Chromium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-#ifndef SERVICES_SERVICE_MANAGER_STANDALONE_TRACER_H_
-#define SERVICES_SERVICE_MANAGER_STANDALONE_TRACER_H_
-
-#include <stddef.h>
-#include <stdio.h>
-
-#include <memory>
-#include <string>
-
-#include "base/callback.h"
-#include "base/macros.h"
-#include "base/memory/ref_counted_memory.h"
-#include "mojo/common/data_pipe_drainer.h"
-#include "services/tracing/public/interfaces/tracing.mojom.h"
-
-namespace service_manager {
-
-// Tracer collects tracing data from base/trace_event and from externally
-// configured sources, aggregates it into a single stream, and writes it out to
-// a file. It should be constructed very early in a process' lifetime before any
-// initialization that may be interesting to trace has occured and be shut down
-// as late as possible to capture as much initialization/shutdown code as
-// possible.
-class Tracer : public mojo::common::DataPipeDrainer::Client {
- public:
-  Tracer();
-  ~Tracer() override;
-
-  // Starts tracing the current process with the given set of categories. The
-  // tracing results will be saved into the specified filename when
-  // StopAndFlushToFile() is called.
-  void Start(const std::string& categories,
-             const std::string& duration_seconds_str,
-             const std::string& filename);
-
-  // Starts collecting data from the tracing service with the given set of
-  // categories.
-  void StartCollectingFromTracingService(
-      tracing::mojom::CollectorPtr coordinator);
-
-  // Stops tracing and flushes all collected trace data to the file specified in
-  // Start(). Blocks until the file write is complete. May be called after the
-  // message loop is shut down.
-  void StopAndFlushToFile();
-
-  void ConnectToProvider(tracing::mojom::ProviderRequest request);
-
- private:
-  void StopTracingAndFlushToDisk();
-
-  // Called from the flush thread. When all data is collected this runs
-  // |done_callback| on the flush thread.
-  void EndTraceAndFlush(const std::string& filename,
-                        const base::Closure& done_callback);
-
-  // Called from the flush thread.
-  void WriteTraceDataCollected(
-      const base::Closure& done_callback,
-      const scoped_refptr<base::RefCountedString>& events_str,
-      bool has_more_events);
-
-  // mojo::common::DataPipeDrainer::Client implementation.
-  void OnDataAvailable(const void* data, size_t num_bytes) override;
-  void OnDataComplete() override;
-
-  // Emits a comma if needed.
-  void WriteCommaIfNeeded();
-
-  // Writes trace file footer and closes out the file.
-  void WriteFooterAndClose();
-
-  // Set when connected to the tracing service.
-  tracing::mojom::CollectorPtr coordinator_;
-  std::unique_ptr<mojo::common::DataPipeDrainer> drainer_;
-
-  // Whether we're currently tracing.
-  bool tracing_;
-  // Categories to trace.
-  std::string categories_;
-
-  // Whether we've written the first chunk.
-  bool first_chunk_written_;
-  std::string trace_service_data_;
-
-  // Trace file, if open.
-  FILE* trace_file_;
-  std::string trace_filename_;
-
-  DISALLOW_COPY_AND_ASSIGN(Tracer);
-};
-
-}  // namespace service_manager
-
-#endif  // SERVICES_SERVICE_MANAGER_STANDALONE_TRACER_H_