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// 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.
#include "components/rappor/public/sample.h"
#include <map>
#include <string>
#include "base/logging.h"
#include "base/metrics/metrics_hashes.h"
#include "components/rappor/bloom_filter.h"
#include "components/rappor/byte_vector_utils.h"
#include "components/rappor/proto/rappor_metric.pb.h"
#include "components/rappor/reports.h"
namespace rappor {
Sample::Sample(int32_t cohort_seed, const RapporParameters& parameters)
: parameters_(parameters),
bloom_offset_((cohort_seed % parameters_.num_cohorts) *
parameters_.bloom_filter_hash_function_count) {
// Must use bloom filter size that fits in uint64_t.
DCHECK_LE(parameters_.bloom_filter_size_bytes, 8u);
}
Sample::~Sample() {
}
void Sample::SetStringField(const std::string& field_name,
const std::string& value) {
DVLOG(2) << "Recording sample \"" << value
<< "\" for sample metric field \"" << field_name << "\"";
DCHECK_EQ(0u, field_info_[field_name].size);
uint64_t bloom_bits = internal::GetBloomBits(
parameters_.bloom_filter_size_bytes,
parameters_.bloom_filter_hash_function_count,
bloom_offset_,
value);
field_info_[field_name] = Sample::FieldInfo{
parameters_.bloom_filter_size_bytes /* size */,
bloom_bits /* value */,
parameters_.noise_level,
};
}
void Sample::SetFlagsField(const std::string& field_name,
uint64_t flags,
size_t num_flags) {
SetFlagsField(field_name, flags, num_flags, parameters_.noise_level);
}
void Sample::SetFlagsField(const std::string& field_name,
uint64_t flags,
size_t num_flags,
NoiseLevel noise_level) {
if (noise_level == NO_NOISE) {
// Non-noised fields can only be recorded for UMA rappor metrics.
DCHECK_EQ(UMA_RAPPOR_GROUP, parameters_.recording_group);
if (parameters_.recording_group != UMA_RAPPOR_GROUP)
return;
}
DVLOG(2) << "Recording flags " << flags
<< " for sample metric field \"" << field_name << "\"";
DCHECK_EQ(0u, field_info_[field_name].size);
DCHECK_GT(num_flags, 0u);
DCHECK_LE(num_flags, 64u);
DCHECK(num_flags == 64u || flags >> num_flags == 0);
field_info_[field_name] = Sample::FieldInfo{
(num_flags + 7) / 8 /* size */,
flags /* value */,
noise_level,
};
}
void Sample::SetUInt64Field(const std::string& field_name,
uint64_t value,
NoiseLevel noise_level) {
// Noised integers not supported yet.
DCHECK_EQ(NO_NOISE, noise_level);
// Non-noised fields can only be recorded for UMA rappor metrics.
DCHECK_EQ(UMA_RAPPOR_GROUP, parameters_.recording_group);
if (parameters_.recording_group != UMA_RAPPOR_GROUP)
return;
DCHECK_EQ(0u, field_info_[field_name].size);
field_info_[field_name] = Sample::FieldInfo{
8,
value,
noise_level,
};
}
void Sample::ExportMetrics(const std::string& secret,
const std::string& metric_name,
RapporReports* reports) const {
for (const auto& kv : field_info_) {
FieldInfo field_info = kv.second;
ByteVector value_bytes(field_info.size);
Uint64ToByteVector(field_info.value, field_info.size, &value_bytes);
ByteVector report_bytes = internal::GenerateReport(
secret,
internal::kNoiseParametersForLevel[field_info.noise_level],
value_bytes);
RapporReports::Report* report = reports->add_report();
report->set_name_hash(base::HashMetricName(
metric_name + "." + kv.first));
report->set_bits(std::string(report_bytes.begin(), report_bytes.end()));
DVLOG(2) << "Exporting sample " << metric_name << "." << kv.first;
}
}
} // namespace rappor
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