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// 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 "content/browser/histogram_message_filter.h"
#include "base/command_line.h"
#include "base/metrics/histogram.h"
#include "base/metrics/statistics_recorder.h"
#include "content/browser/histogram_controller.h"
#include "content/browser/tcmalloc_internals_request_job.h"
#include "content/common/child_process_messages.h"
#include "content/public/common/content_switches.h"
namespace content {
HistogramMessageFilter::HistogramMessageFilter() {}
void HistogramMessageFilter::OnChannelConnected(int32 peer_pid) {
BrowserMessageFilter::OnChannelConnected(peer_pid);
}
bool HistogramMessageFilter::OnMessageReceived(const IPC::Message& message,
bool* message_was_ok) {
bool handled = true;
IPC_BEGIN_MESSAGE_MAP_EX(HistogramMessageFilter, message, *message_was_ok)
IPC_MESSAGE_HANDLER(ChildProcessHostMsg_ChildHistogramData,
OnChildHistogramData)
IPC_MESSAGE_HANDLER(ChildProcessHostMsg_GetBrowserHistogram,
OnGetBrowserHistogram)
IPC_MESSAGE_UNHANDLED(handled = false)
IPC_END_MESSAGE_MAP_EX()
return handled;
}
HistogramMessageFilter::~HistogramMessageFilter() {}
void HistogramMessageFilter::OnChildHistogramData(
int sequence_number,
const std::vector<std::string>& pickled_histograms) {
HistogramController::GetInstance()->OnHistogramDataCollected(
sequence_number, pickled_histograms);
}
void HistogramMessageFilter::OnGetBrowserHistogram(
const std::string& name,
std::string* histogram_json) {
DCHECK(content::BrowserThread::CurrentlyOn(content::BrowserThread::IO));
// Security: Only allow access to browser histograms when running in the
// context of a test.
bool using_stats_collection_controller =
CommandLine::ForCurrentProcess()->HasSwitch(
switches::kStatsCollectionController);
if (!using_stats_collection_controller) {
LOG(ERROR) << "Attempt at reading browser histogram without specifying "
<< "--" << switches::kStatsCollectionController << " switch.";
return;
}
base::HistogramBase* histogram =
base::StatisticsRecorder::FindHistogram(name);
if (!histogram) {
*histogram_json = "{}";
} else {
histogram->WriteJSON(histogram_json);
}
}
} // namespace content
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