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      1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
      2 // Use of this source code is governed by a BSD-style license that can be
      3 // found in the LICENSE file.
      4 
      5 #include "content/child/child_histogram_message_filter.h"
      6 
      7 #include <ctype.h>
      8 
      9 #include "base/bind.h"
     10 #include "base/message_loop/message_loop.h"
     11 #include "base/metrics/statistics_recorder.h"
     12 #include "base/pickle.h"
     13 #include "content/child/child_process.h"
     14 #include "content/child/child_thread.h"
     15 #include "content/common/child_process_messages.h"
     16 
     17 namespace content {
     18 
     19 ChildHistogramMessageFilter::ChildHistogramMessageFilter()
     20     : channel_(NULL),
     21       io_message_loop_(ChildProcess::current()->io_message_loop_proxy()),
     22       histogram_snapshot_manager_(this) {
     23 }
     24 
     25 ChildHistogramMessageFilter::~ChildHistogramMessageFilter() {
     26 }
     27 
     28 void ChildHistogramMessageFilter::OnFilterAdded(IPC::Channel* channel) {
     29   channel_ = channel;
     30 }
     31 
     32 void ChildHistogramMessageFilter::OnFilterRemoved() {
     33 }
     34 
     35 bool ChildHistogramMessageFilter::OnMessageReceived(
     36     const IPC::Message& message) {
     37   bool handled = true;
     38   IPC_BEGIN_MESSAGE_MAP(ChildHistogramMessageFilter, message)
     39     IPC_MESSAGE_HANDLER(ChildProcessMsg_GetChildHistogramData,
     40                         OnGetChildHistogramData)
     41     IPC_MESSAGE_UNHANDLED(handled = false)
     42   IPC_END_MESSAGE_MAP()
     43   return handled;
     44 }
     45 
     46 void ChildHistogramMessageFilter::SendHistograms(int sequence_number) {
     47   io_message_loop_->PostTask(
     48       FROM_HERE, base::Bind(&ChildHistogramMessageFilter::UploadAllHistograms,
     49                             this, sequence_number));
     50 }
     51 
     52 void ChildHistogramMessageFilter::OnGetChildHistogramData(int sequence_number) {
     53   UploadAllHistograms(sequence_number);
     54 }
     55 
     56 void ChildHistogramMessageFilter::UploadAllHistograms(int sequence_number) {
     57   DCHECK_EQ(0u, pickled_histograms_.size());
     58 
     59   // Push snapshots into our pickled_histograms_ vector.
     60   // Note: Before serializing, we set the kIPCSerializationSourceFlag for all
     61   // the histograms, so that the receiving process can distinguish them from the
     62   // local histograms.
     63   histogram_snapshot_manager_.PrepareDeltas(
     64       base::Histogram::kIPCSerializationSourceFlag, false);
     65 
     66   channel_->Send(new ChildProcessHostMsg_ChildHistogramData(
     67       sequence_number, pickled_histograms_));
     68 
     69   pickled_histograms_.clear();
     70   static int count = 0;
     71   count++;
     72   DHISTOGRAM_COUNTS("Histogram.ChildProcessHistogramSentCount", count);
     73 }
     74 
     75 void ChildHistogramMessageFilter::RecordDelta(
     76     const base::HistogramBase& histogram,
     77     const base::HistogramSamples& snapshot) {
     78   DCHECK_NE(0, snapshot.TotalCount());
     79 
     80   Pickle pickle;
     81   histogram.SerializeInfo(&pickle);
     82   snapshot.Serialize(&pickle);
     83 
     84   pickled_histograms_.push_back(
     85       std::string(static_cast<const char*>(pickle.data()), pickle.size()));
     86 }
     87 
     88 void ChildHistogramMessageFilter::InconsistencyDetected(
     89     base::HistogramBase::Inconsistency problem) {
     90   UMA_HISTOGRAM_ENUMERATION("Histogram.InconsistenciesChildProcess",
     91                             problem, base::HistogramBase::NEVER_EXCEEDED_VALUE);
     92 }
     93 
     94 void ChildHistogramMessageFilter::UniqueInconsistencyDetected(
     95     base::HistogramBase::Inconsistency problem) {
     96   UMA_HISTOGRAM_ENUMERATION("Histogram.InconsistenciesChildProcessUnique",
     97                             problem, base::HistogramBase::NEVER_EXCEEDED_VALUE);
     98 }
     99 
    100 void ChildHistogramMessageFilter::InconsistencyDetectedInLoggedCount(
    101     int amount) {
    102   UMA_HISTOGRAM_COUNTS("Histogram.InconsistentSnapshotChildProcess",
    103                        std::abs(amount));
    104 }
    105 
    106 }  // namespace content
    107