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// Copyright 2014 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/metrics/metrics_log_base.h"
#include "base/metrics/histogram_base.h"
#include "base/metrics/histogram_samples.h"
#include "components/metrics/metrics_hashes.h"
#include "components/metrics/proto/histogram_event.pb.h"
#include "components/metrics/proto/system_profile.pb.h"
#include "components/metrics/proto/user_action_event.pb.h"
using base::Histogram;
using base::HistogramBase;
using base::HistogramSamples;
using base::SampleCountIterator;
using base::Time;
using base::TimeDelta;
using metrics::HistogramEventProto;
using metrics::SystemProfileProto;
using metrics::UserActionEventProto;
namespace metrics {
namespace {
// Any id less than 16 bytes is considered to be a testing id.
bool IsTestingID(const std::string& id) {
return id.size() < 16;
}
} // namespace
MetricsLogBase::MetricsLogBase(const std::string& client_id,
int session_id,
LogType log_type,
const std::string& version_string)
: num_events_(0),
locked_(false),
log_type_(log_type) {
DCHECK_NE(NO_LOG, log_type);
if (IsTestingID(client_id))
uma_proto_.set_client_id(0);
else
uma_proto_.set_client_id(Hash(client_id));
uma_proto_.set_session_id(session_id);
uma_proto_.mutable_system_profile()->set_build_timestamp(GetBuildTime());
uma_proto_.mutable_system_profile()->set_app_version(version_string);
}
MetricsLogBase::~MetricsLogBase() {}
// static
uint64 MetricsLogBase::Hash(const std::string& value) {
uint64 hash = metrics::HashMetricName(value);
// The following log is VERY helpful when folks add some named histogram into
// the code, but forgot to update the descriptive list of histograms. When
// that happens, all we get to see (server side) is a hash of the histogram
// name. We can then use this logging to find out what histogram name was
// being hashed to a given MD5 value by just running the version of Chromium
// in question with --enable-logging.
DVLOG(1) << "Metrics: Hash numeric [" << value << "]=[" << hash << "]";
return hash;
}
// static
int64 MetricsLogBase::GetBuildTime() {
static int64 integral_build_time = 0;
if (!integral_build_time) {
Time time;
const char* kDateTime = __DATE__ " " __TIME__ " GMT";
bool result = Time::FromString(kDateTime, &time);
DCHECK(result);
integral_build_time = static_cast<int64>(time.ToTimeT());
}
return integral_build_time;
}
// static
int64 MetricsLogBase::GetCurrentTime() {
return (base::TimeTicks::Now() - base::TimeTicks()).InSeconds();
}
void MetricsLogBase::CloseLog() {
DCHECK(!locked_);
locked_ = true;
}
void MetricsLogBase::GetEncodedLog(std::string* encoded_log) {
DCHECK(locked_);
uma_proto_.SerializeToString(encoded_log);
}
void MetricsLogBase::RecordUserAction(const std::string& key) {
DCHECK(!locked_);
UserActionEventProto* user_action = uma_proto_.add_user_action_event();
user_action->set_name_hash(Hash(key));
user_action->set_time(GetCurrentTime());
++num_events_;
}
void MetricsLogBase::RecordHistogramDelta(const std::string& histogram_name,
const HistogramSamples& snapshot) {
DCHECK(!locked_);
DCHECK_NE(0, snapshot.TotalCount());
// We will ignore the MAX_INT/infinite value in the last element of range[].
HistogramEventProto* histogram_proto = uma_proto_.add_histogram_event();
histogram_proto->set_name_hash(Hash(histogram_name));
histogram_proto->set_sum(snapshot.sum());
for (scoped_ptr<SampleCountIterator> it = snapshot.Iterator(); !it->Done();
it->Next()) {
HistogramBase::Sample min;
HistogramBase::Sample max;
HistogramBase::Count count;
it->Get(&min, &max, &count);
HistogramEventProto::Bucket* bucket = histogram_proto->add_bucket();
bucket->set_min(min);
bucket->set_max(max);
bucket->set_count(count);
}
// Omit fields to save space (see rules in histogram_event.proto comments).
for (int i = 0; i < histogram_proto->bucket_size(); ++i) {
HistogramEventProto::Bucket* bucket = histogram_proto->mutable_bucket(i);
if (i + 1 < histogram_proto->bucket_size() &&
bucket->max() == histogram_proto->bucket(i + 1).min()) {
bucket->clear_max();
} else if (bucket->max() == bucket->min() + 1) {
bucket->clear_min();
}
}
}
} // namespace metrics
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