Move part of metrics from chrome/common to components

chrome/common/metrics/metrics_log_base.cc

-// Copyright (c) 2012 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 "chrome/common/metrics/metrics_log_base.h"
-
-#include "base/metrics/histogram_base.h"
-#include "base/metrics/histogram_samples.h"
-#include "chrome/common/chrome_version_info.h"
-#include "chrome/common/metrics/proto/histogram_event.pb.h"
-#include "chrome/common/metrics/proto/system_profile.pb.h"
-#include "chrome/common/metrics/proto/user_action_event.pb.h"
-#include "components/metrics/metrics_hashes.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 {
-
-// Any id less than 16 bytes is considered to be a testing id.
-bool IsTestingID(const std::string& id) {
-  return id.size() < 16;
-}
-
-SystemProfileProto::Channel AsProtobufChannel(
-    chrome::VersionInfo::Channel channel) {
-  switch (channel) {
-    case chrome::VersionInfo::CHANNEL_UNKNOWN:
-      return SystemProfileProto::CHANNEL_UNKNOWN;
-    case chrome::VersionInfo::CHANNEL_CANARY:
-      return SystemProfileProto::CHANNEL_CANARY;
-    case chrome::VersionInfo::CHANNEL_DEV:
-      return SystemProfileProto::CHANNEL_DEV;
-    case chrome::VersionInfo::CHANNEL_BETA:
-      return SystemProfileProto::CHANNEL_BETA;
-    case chrome::VersionInfo::CHANNEL_STABLE:
-      return SystemProfileProto::CHANNEL_STABLE;
-    default:
-      NOTREACHED();
-      return SystemProfileProto::CHANNEL_UNKNOWN;
-  }
-}
-
-}  // 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);
-  uma_proto_.mutable_system_profile()->set_channel(
-      AsProtobufChannel(chrome::VersionInfo::GetChannel()));
-}
-
-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();
-    }
-  }
-}