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| 1 // Copyright 2014 The Chromium Authors. All rights reserved. |
| 2 // Use of this source code is governed by a BSD-style license that can be |
| 3 // found in the LICENSE file. |
| 4 |
| 5 #ifndef COMPONENTS_METRICS_CHROMEOS_METRICS_UTILS_H_ |
| 6 #define COMPONENTS_METRICS_CHROMEOS_METRICS_UTILS_H_ |
| 7 |
| 8 #include <string> |
| 9 |
| 10 #include "base/memory/scoped_ptr.h" |
| 11 #include "base/memory/scoped_vector.h" |
| 12 |
| 13 namespace metrics { |
| 14 |
| 15 class MetricSample; |
| 16 |
| 17 // Metrics helpers to serialize and deserialize metrics collected by |
| 18 // ChromeOS. |
| 19 namespace MetricsUtils { |
| 20 |
| 21 // Deserialize a sample passed as a string and return a sample. |
| 22 // The return value will either be a scoped_ptr to a Metric sample (if the |
| 23 // deserialization was successful) or a NULL scoped_ptr. |
| 24 scoped_ptr<MetricSample> ReadSample(const std::string& sample); |
| 25 |
| 26 // Read all samples from a file and truncate the file when done. |
| 27 void ReadAndTruncateMetricsFromFile(const std::string& filename, |
| 28 ScopedVector<MetricSample>* metrics); |
| 29 |
| 30 // Serialize a sample and write it to filename. |
| 31 // The format for the message is: |
| 32 // message_size, serialized_message |
| 33 // where |
| 34 // * message_size is the total length of the message (message_size + |
| 35 // serialized_message) on 4 bytes |
| 36 // * serialized_message is the serialized version of sample (using ToString) |
| 37 bool WriteMetricToFile(const MetricSample* sample, const std::string& filename); |
| 38 |
| 39 // Maximum length of a serialized message |
| 40 const int kMessageMaxLength = 1024; |
| 41 |
| 42 } // namespace MetricsUtils |
| 43 } // namespace metrics |
| 44 |
| 45 #endif // COMPONENTS_METRICS_CHROMEOS_METRICS_UTILS_H_ |
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