82 lines
2.7 KiB
C++
82 lines
2.7 KiB
C++
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// Copyright 2013 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#include "base/metrics/histogram_delta_serialization.h"
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#include "base/logging.h"
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#include "base/metrics/histogram_base.h"
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#include "base/metrics/histogram_snapshot_manager.h"
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#include "base/metrics/statistics_recorder.h"
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#include "base/numerics/safe_conversions.h"
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#include "base/pickle.h"
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#include "base/values.h"
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namespace base {
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namespace {
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// Create or find existing histogram and add the samples from pickle.
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// Silently returns when seeing any data problem in the pickle.
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void DeserializeHistogramAndAddSamples(PickleIterator* iter) {
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HistogramBase* histogram = DeserializeHistogramInfo(iter);
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if (!histogram)
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return;
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if (histogram->flags() & HistogramBase::kIPCSerializationSourceFlag) {
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DVLOG(1) << "Single process mode, histogram observed and not copied: "
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<< histogram->histogram_name();
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return;
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}
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histogram->AddSamplesFromPickle(iter);
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}
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} // namespace
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HistogramDeltaSerialization::HistogramDeltaSerialization(
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const std::string& caller_name)
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: histogram_snapshot_manager_(this), serialized_deltas_(nullptr) {}
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HistogramDeltaSerialization::~HistogramDeltaSerialization() = default;
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void HistogramDeltaSerialization::PrepareAndSerializeDeltas(
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std::vector<std::string>* serialized_deltas,
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bool include_persistent) {
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DCHECK(thread_checker_.CalledOnValidThread());
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serialized_deltas_ = serialized_deltas;
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// Note: Before serializing, we set the kIPCSerializationSourceFlag for all
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// the histograms, so that the receiving process can distinguish them from the
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// local histograms.
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StatisticsRecorder::PrepareDeltas(
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include_persistent, Histogram::kIPCSerializationSourceFlag,
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Histogram::kNoFlags, &histogram_snapshot_manager_);
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serialized_deltas_ = nullptr;
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}
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// static
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void HistogramDeltaSerialization::DeserializeAndAddSamples(
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const std::vector<std::string>& serialized_deltas) {
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for (auto it = serialized_deltas.begin(); it != serialized_deltas.end();
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++it) {
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Pickle pickle(it->data(), checked_cast<int>(it->size()));
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PickleIterator iter(pickle);
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DeserializeHistogramAndAddSamples(&iter);
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}
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}
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void HistogramDeltaSerialization::RecordDelta(
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const HistogramBase& histogram,
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const HistogramSamples& snapshot) {
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DCHECK(thread_checker_.CalledOnValidThread());
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DCHECK_NE(0, snapshot.TotalCount());
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Pickle pickle;
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histogram.SerializeInfo(&pickle);
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snapshot.Serialize(&pickle);
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serialized_deltas_->push_back(
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std::string(static_cast<const char*>(pickle.data()), pickle.size()));
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}
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} // namespace base
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