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// Copyright 2019 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/browser/ui/webui/webui_load_timer.h"
#include "base/metrics/histogram.h"
#include "base/timer/elapsed_timer.h"
#include "content/public/browser/navigation_handle.h"
#include "content/public/browser/web_contents.h"
namespace {
// Extract UMA_HISTOGRAM_TIMES to allow multiple calls from the same location
// with different names. This skips some optimization, but we don't expect to
// call this frequently.
void CallUmaHistogramTimes(const std::string& name, base::TimeDelta duration) {
base::HistogramBase* histogram = base::Histogram::FactoryTimeGet(
name, base::TimeDelta::FromMilliseconds(1),
base::TimeDelta::FromSeconds(10), 50,
base::HistogramBase::kUmaTargetedHistogramFlag);
DCHECK(histogram);
histogram->AddTime(duration);
}
} // namespace
WebuiLoadTimer::WebuiLoadTimer(
content::WebContents* web_contents,
const std::string& document_initial_load_uma_id,
const std::string& document_load_completed_uma_id)
: content::WebContentsObserver(web_contents),
document_initial_load_uma_id_(document_initial_load_uma_id),
document_load_completed_uma_id_(document_load_completed_uma_id) {
DCHECK(!document_initial_load_uma_id_.empty());
DCHECK(!document_load_completed_uma_id_.empty());
}
WebuiLoadTimer::~WebuiLoadTimer() = default;
void WebuiLoadTimer::DidStartNavigation(
content::NavigationHandle* navigation_handle) {
if (!navigation_handle->IsInMainFrame() ||
navigation_handle->IsSameDocument()) {
return;
}
timer_ = std::make_unique<base::ElapsedTimer>();
}
void WebuiLoadTimer::DOMContentLoaded(
content::RenderFrameHost* render_frame_host) {
// See comment in DocumentOnLoadCompletedInMainFrame.
if (!timer_ || render_frame_host != web_contents()->GetMainFrame())
return;
CallUmaHistogramTimes(document_initial_load_uma_id_, timer_->Elapsed());
}
void WebuiLoadTimer::DocumentOnLoadCompletedInMainFrame() {
// The WebContents could have been created for a child RenderFrameHost so it
// would never receive a DidStartNavigation with the main frame, however it
// will receive this callback.
if (!timer_)
return;
CallUmaHistogramTimes(document_load_completed_uma_id_, timer_->Elapsed());
timer_.reset();
}
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