5f6460081c
The format of the metrics dump is rudimentary just yet. Here is an example: Metrics from /data/misc/metrics/uma-events name: hello type: USER_ACTION name: world type: USER_ACTION This required the following changes: * Added -d option to metrics_client * Refactored file handling in SerializationUtils - Factored out file opening and log parsing into helper methods - Added ReadMetricsFromFile which is read-only so does not truncate the file Change-Id: I6032d74242c79c678ec42a14e78fccc54e7af455
64 lines
2.3 KiB
C++
64 lines
2.3 KiB
C++
/*
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* Copyright (C) 2015 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#ifndef METRICS_SERIALIZATION_SERIALIZATION_UTILS_H_
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#define METRICS_SERIALIZATION_SERIALIZATION_UTILS_H_
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#include <string>
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#include "base/memory/scoped_ptr.h"
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#include "base/memory/scoped_vector.h"
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namespace metrics {
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class MetricSample;
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// Metrics helpers to serialize and deserialize metrics collected by
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// ChromeOS.
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namespace SerializationUtils {
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// Deserializes a sample passed as a string and return a sample.
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// The return value will either be a scoped_ptr to a Metric sample (if the
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// deserialization was successful) or a NULL scoped_ptr.
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scoped_ptr<MetricSample> ParseSample(const std::string& sample);
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// Reads all samples from a file. The file contents remain unchanged.
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void ReadMetricsFromFile(const std::string& filename,
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ScopedVector<MetricSample>* metrics);
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// Reads all samples from a file and truncates the file when done.
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void ReadAndTruncateMetricsFromFile(const std::string& filename,
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ScopedVector<MetricSample>* metrics);
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// Serializes a sample and write it to filename.
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// The format for the message is:
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// message_size, serialized_message
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// where
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// * message_size is the total length of the message (message_size +
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// serialized_message) on 4 bytes
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// * serialized_message is the serialized version of sample (using ToString)
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//
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// NB: the file will never leave the device so message_size will be written
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// with the architecture's endianness.
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bool WriteMetricToFile(const MetricSample& sample, const std::string& filename);
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// Maximum length of a serialized message
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static const int kMessageMaxLength = 1024;
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} // namespace SerializationUtils
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} // namespace metrics
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#endif // METRICS_SERIALIZATION_SERIALIZATION_UTILS_H_
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