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// Copyright 2021 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "content/browser/renderer_host/recently_destroyed_hosts.h"
#include <memory>
#include "base/memory/raw_ptr.h"
#include "base/test/metrics/histogram_tester.h"
#include "base/time/time.h"
#include "content/browser/browsing_instance.h"
#include "content/browser/child_process_security_policy_impl.h"
#include "content/browser/isolation_context.h"
#include "content/browser/origin_agent_cluster_isolation_state.h"
#include "content/browser/process_lock.h"
#include "content/browser/site_instance_impl.h"
#include "content/browser/web_exposed_isolation_info.h"
#include "content/public/test/browser_task_environment.h"
#include "content/public/test/mock_render_process_host.h"
#include "content/public/test/test_browser_context.h"
#include "content/test/storage_partition_test_helpers.h"
#include "testing/gmock/include/gmock/gmock.h"
#include "testing/gtest/include/gtest/gtest.h"
namespace content {
class RecentlyDestroyedHostsTest : public testing::Test {
protected:
RecentlyDestroyedHostsTest()
: task_environment_(BrowserTaskEnvironment::TimeSource::MOCK_TIME),
instance_(RecentlyDestroyedHosts::GetInstance(&browser_context_)) {}
void AddReuseInterval(base::TimeDelta interval) {
instance_->AddReuseInterval(interval);
task_environment_.FastForwardBy(base::Seconds(1));
}
std::vector<base::TimeDelta> GetReuseIntervals() {
std::vector<base::TimeDelta> intervals;
for (auto& reuse_interval : instance_->reuse_intervals_) {
intervals.push_back(reuse_interval.interval);
}
return intervals;
}
BrowserTaskEnvironment task_environment_;
TestBrowserContext browser_context_;
raw_ptr<RecentlyDestroyedHosts> instance_;
};
TEST_F(RecentlyDestroyedHostsTest,
RecordMetricIfReusableHostRecentlyDestroyed) {
const IsolationContext isolation_context(
BrowsingInstanceId(1), &browser_context_,
/*is_guest=*/false,
/*is_fenced=*/false,
OriginAgentClusterIsolationState::CreateForDefaultIsolation(
&browser_context_));
const ProcessLock process_lock = ProcessLock::Create(
isolation_context,
UrlInfo::CreateForTesting(GURL("https://www.google.com"),
CreateStoragePartitionConfigForTesting()));
constexpr char kHistogramName[] =
"SiteIsolation.ReusePendingOrCommittedSite."
"TimeSinceReusableProcessDestroyed";
std::unique_ptr<base::HistogramTester> histogram_tester =
std::make_unique<base::HistogramTester>();
// No entries matching |process_lock| are in the list of recently destroyed
// hosts, so histogram value |kRecentlyDestroyedNotFoundSentinel| should be
// emitted.
RecentlyDestroyedHosts::RecordMetricIfReusableHostRecentlyDestroyed(
base::TimeTicks::Now(), process_lock, &browser_context_);
constexpr base::TimeDelta kRecentlyDestroyedNotFoundSentinel =
base::Seconds(20);
histogram_tester->ExpectUniqueTimeSample(
kHistogramName, kRecentlyDestroyedNotFoundSentinel, 1);
// Add a RenderProcessHost for |process_lock| to RecentlyDestroyedHosts.
MockRenderProcessHost host(&browser_context_, /*is_for_guests_only=*/false);
host.SetProcessLock(isolation_context, process_lock);
RecentlyDestroyedHosts::Add(
&host, /*time_spent_running_unload_handlers=*/base::TimeDelta(),
&browser_context_);
// Histogram value 0 seconds should be emitted, because no time has passed
// (in this test's mocked time) since |host| was added.
histogram_tester = std::make_unique<base::HistogramTester>();
RecentlyDestroyedHosts::RecordMetricIfReusableHostRecentlyDestroyed(
base::TimeTicks::Now(), process_lock, &browser_context_);
histogram_tester->ExpectUniqueTimeSample(kHistogramName, base::TimeDelta(),
1);
// Re-add |host| to RecentlyDestroyedHosts right before its storage timeout
// expires.
task_environment_.FastForwardBy(
RecentlyDestroyedHosts::kRecentlyDestroyedStorageTimeout -
base::Seconds(1));
RecentlyDestroyedHosts::Add(
&host, /*time_spent_running_unload_handlers=*/base::TimeDelta(),
&browser_context_);
constexpr base::TimeDelta kReuseInterval = base::Seconds(5);
task_environment_.FastForwardBy(kReuseInterval);
histogram_tester = std::make_unique<base::HistogramTester>();
RecentlyDestroyedHosts::RecordMetricIfReusableHostRecentlyDestroyed(
base::TimeTicks::Now(), process_lock, &browser_context_);
// |host| should still be in RecentlyDestroyedHosts because its storage time
// was refreshed by the second call to Add(). The histogram should emit the
// time since the last call to Add() matching |process_lock|.
histogram_tester->ExpectUniqueTimeSample(kHistogramName, kReuseInterval, 1);
// After the storage timeout passes, |host| should no longer be present.
histogram_tester = std::make_unique<base::HistogramTester>();
task_environment_.FastForwardBy(
RecentlyDestroyedHosts::kRecentlyDestroyedStorageTimeout);
RecentlyDestroyedHosts::RecordMetricIfReusableHostRecentlyDestroyed(
base::TimeTicks::Now(), process_lock, &browser_context_);
histogram_tester->ExpectUniqueTimeSample(
kHistogramName, kRecentlyDestroyedNotFoundSentinel, 1);
}
TEST_F(RecentlyDestroyedHostsTest, AddReuseInterval) {
const base::TimeDelta t1 = base::Seconds(4);
const base::TimeDelta t2 = base::Seconds(5);
const base::TimeDelta t3 = base::Seconds(6.7);
const base::TimeDelta t4 = base::Seconds(8.2);
const base::TimeDelta t5 = base::Seconds(10);
const base::TimeDelta t6 = base::Seconds(11);
AddReuseInterval(t2);
EXPECT_THAT(GetReuseIntervals(), testing::ElementsAre(t2));
// The list of reuse intervals should be sorted from smallest to largest.
AddReuseInterval(t1);
AddReuseInterval(t1);
AddReuseInterval(t3);
AddReuseInterval(t6);
EXPECT_THAT(GetReuseIntervals(), testing::ElementsAre(t1, t1, t2, t3, t6));
// When the list of reuse intervals is at its maximum size and a new entry is
// added, it should replace the oldest entry.
AddReuseInterval(t5);
EXPECT_THAT(GetReuseIntervals(), testing::ElementsAre(t1, t1, t3, t5, t6));
AddReuseInterval(t4);
EXPECT_THAT(GetReuseIntervals(), testing::ElementsAre(t1, t3, t4, t5, t6));
}
} // namespace content
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