serialization_utils.cc | Explore in Territory

// Copyright 2014 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifdef UNSAFE_BUFFERS_BUILD
// TODO(crbug.com/40285824): Remove this and convert code to safer constructs.
#pragma allow_unsafe_buffers
#endif

#include "components/metrics/serialization/serialization_utils.h"

#include <errno.h>
#include <stdint.h>
#include <sys/file.h>
#include <unistd.h>

#include <utility>

#include "base/containers/span.h"
#include "base/files/file_path.h"
#include "base/files/file_util.h"
#include "base/files/scoped_file.h"
#include "base/logging.h"
#include "base/metrics/histogram_functions.h"
#include "base/numerics/safe_math.h"
#include "base/strings/string_split.h"
#include "base/strings/string_util.h"
#include "components/metrics/serialization/metric_sample.h"

#define READ_WRITE_ALL_FILE_FLAGS …

namespace metrics {
namespace {
// Reads the next message from |file_descriptor| into |message|.
//
// |message| will be set to the empty string if no message could be read (EOF)
// or the message was badly constructed.
//
// Returns false if no message can be read from this file anymore (EOF or
// unrecoverable error).
bool ReadMessage(int fd, std::string* message) { … }

// Reads all samples from a file and when done:
//  1) deletes the file if |delete_file| is true.
//  2) truncates the file if |delete_file| is false.
//
// This method is the implementation of ReadAndTruncateMetricsFromFile() and
// ReadAndDeleteMetricsFromFile().
void ReadAndTruncateOrDeleteMetricsFromFile(
    const std::string& filename,
    bool delete_file,
    std::vector<std::unique_ptr<MetricSample>>* metrics) { … }

}  // namespace

// This value is used as a max value in a histogram,
// Platform.ExternalMetrics.SamplesRead. If it changes, the histogram will need
// to be renamed.
const int SerializationUtils::kMaxMessagesPerRead = …;

std::unique_ptr<MetricSample> SerializationUtils::ParseSample(
    const std::string& sample) { … }

void SerializationUtils::ReadAndTruncateMetricsFromFile(
    const std::string& filename,
    std::vector<std::unique_ptr<MetricSample>>* metrics) { … }

void SerializationUtils::ReadAndDeleteMetricsFromFile(
    const std::string& filename,
    std::vector<std::unique_ptr<MetricSample>>* metrics) { … }

bool SerializationUtils::WriteMetricToFile(const MetricSample& sample,
                                           const std::string& filename) { … }

}  // namespace metrics
chromium/components/metrics/serialization/serialization_utils.cc
