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// Copyright 2020 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "chrome/browser/ash/net/network_diagnostics/https_latency_routine.h"
#include <string>
#include <utility>
#include <vector>
#include "base/functional/bind.h"
#include "base/memory/raw_ptr.h"
#include "base/time/default_tick_clock.h"
#include "chrome/browser/ash/net/network_diagnostics/network_diagnostics_util.h"
#include "chrome/browser/profiles/profile.h"
#include "content/public/browser/storage_partition.h"
#include "mojo/public/cpp/bindings/receiver.h"
#include "mojo/public/cpp/bindings/remote.h"
#include "net/base/host_port_pair.h"
#include "net/base/net_errors.h"
#include "services/network/public/cpp/simple_host_resolver.h"
#include "services/network/public/mojom/network_context.mojom.h"
namespace ash::network_diagnostics {
namespace {
namespace mojom = ::chromeos::network_diagnostics::mojom;
constexpr int kTotalHostsToQuery = 3;
// The length of a random eight letter prefix.
constexpr int kHostPrefixLength = 8;
constexpr int kHttpsPort = 443;
constexpr char kHttpsScheme[] = "https://";
constexpr base::TimeDelta kRequestTimeoutMs = base::Milliseconds(5 * 1000);
// Requests taking longer than 1000 ms are problematic.
constexpr base::TimeDelta kProblemLatencyMs = base::Milliseconds(1000);
// Requests lasting between 500 ms and 1000 ms are potentially problematic.
constexpr base::TimeDelta kPotentialProblemLatencyMs = base::Milliseconds(500);
base::TimeDelta MedianLatency(std::vector<base::TimeDelta>& latencies) {
if (latencies.size() == 0) {
return base::TimeDelta::Max();
}
std::sort(latencies.begin(), latencies.end());
if (latencies.size() % 2 != 0) {
return latencies[latencies.size() / 2];
}
auto sum =
latencies[latencies.size() / 2] + latencies[(latencies.size() + 1) / 2];
return sum / 2.0;
}
network::mojom::NetworkContext* GetNetworkContext() {
Profile* profile = util::GetUserProfile();
return profile->GetDefaultStoragePartition()->GetNetworkContext();
}
std::unique_ptr<HttpRequestManager> GetHttpRequestManager() {
return std::make_unique<HttpRequestManager>(util::GetUserProfile());
}
} // namespace
HttpsLatencyRoutine::HttpsLatencyRoutine(mojom::RoutineCallSource source)
: NetworkDiagnosticsRoutine(source),
network_context_getter_(base::BindRepeating(&GetNetworkContext)),
http_request_manager_getter_(base::BindRepeating(&GetHttpRequestManager)),
tick_clock_(base::DefaultTickClock::GetInstance()),
hostnames_to_query_dns_(
util::GetRandomHostsWithSchemeAndPortAndGenerate204Path(
kTotalHostsToQuery,
kHostPrefixLength,
kHttpsScheme,
kHttpsPort)),
hostnames_to_query_https_(hostnames_to_query_dns_) {
DCHECK(network_context_getter_);
DCHECK(http_request_manager_getter_);
DCHECK(tick_clock_);
}
HttpsLatencyRoutine::~HttpsLatencyRoutine() = default;
mojom::RoutineType HttpsLatencyRoutine::Type() {
return mojom::RoutineType::kHttpsLatency;
}
void HttpsLatencyRoutine::Run() {
// Before making HTTPS requests to the hosts, add the IP addresses are added
// to the DNS cache. This ensures the HTTPS latency does not include DNS
// resolution time, allowing us to identify issues with HTTPS more precisely.
AttemptNextResolution();
}
void HttpsLatencyRoutine::AnalyzeResultsAndExecuteCallback() {
base::TimeDelta median_latency = MedianLatency(latencies_);
if (!successfully_resolved_hosts_) {
set_verdict(mojom::RoutineVerdict::kProblem);
problems_.emplace_back(mojom::HttpsLatencyProblem::kFailedDnsResolutions);
} else if (failed_connection_) {
set_verdict(mojom::RoutineVerdict::kProblem);
problems_.emplace_back(mojom::HttpsLatencyProblem::kFailedHttpsRequests);
} else {
auto https_latency_result_value =
mojom::HttpsLatencyResultValue::New(median_latency);
set_result_value(mojom::RoutineResultValue::NewHttpsLatencyResultValue(
std::move(https_latency_result_value)));
if (median_latency <= kProblemLatencyMs &&
median_latency > kPotentialProblemLatencyMs) {
set_verdict(mojom::RoutineVerdict::kProblem);
problems_.emplace_back(mojom::HttpsLatencyProblem::kHighLatency);
} else if (median_latency > kProblemLatencyMs) {
set_verdict(mojom::RoutineVerdict::kProblem);
problems_.emplace_back(mojom::HttpsLatencyProblem::kVeryHighLatency);
} else {
set_verdict(mojom::RoutineVerdict::kNoProblem);
}
}
set_problems(mojom::RoutineProblems::NewHttpsLatencyProblems(problems_));
ExecuteCallback();
}
void HttpsLatencyRoutine::AttemptNextResolution() {
network::mojom::NetworkContext* network_context =
network_context_getter_.Run();
DCHECK(network_context);
host_resolver_ = network::SimpleHostResolver::Create(network_context);
GURL url = hostnames_to_query_dns_.back();
hostnames_to_query_dns_.pop_back();
// Resolver host parameter source must be unset or set to ANY in order for DNS
// queries with BuiltInDnsClientEnabled policy disabled to work (b/353448388).
network::mojom::ResolveHostParametersPtr parameters =
network::mojom::ResolveHostParameters::New();
parameters->dns_query_type = net::DnsQueryType::A;
parameters->cache_usage =
network::mojom::ResolveHostParameters::CacheUsage::DISALLOWED;
// TODO(crbug.com/40235854): Consider passing a SchemeHostPort to trigger
// HTTPS DNS resource record query. Unretained(this) is safe here because the
// callback is invoked directly by |host_resolver_| which is owned by |this|.
host_resolver_->ResolveHost(
network::mojom::HostResolverHost::NewHostPortPair(
net::HostPortPair::FromURL(url)),
net::NetworkAnonymizationKey::CreateTransient(), std::move(parameters),
base::BindOnce(&HttpsLatencyRoutine::OnHostResolutionComplete,
base::Unretained(this)));
}
void HttpsLatencyRoutine::OnHostResolutionComplete(
int result,
const net::ResolveErrorInfo&,
const std::optional<net::AddressList>& resolved_addresses,
const std::optional<net::HostResolverEndpointResults>&) {
if (result != net::OK) {
CHECK(!resolved_addresses);
successfully_resolved_hosts_ = false;
AnalyzeResultsAndExecuteCallback();
return;
}
if (hostnames_to_query_dns_.size() > 0) {
AttemptNextResolution();
return;
}
MakeHttpsRequest();
}
void HttpsLatencyRoutine::MakeHttpsRequest() {
GURL url = hostnames_to_query_https_.back();
hostnames_to_query_https_.pop_back();
request_start_time_ = tick_clock_->NowTicks();
http_request_manager_ = http_request_manager_getter_.Run();
http_request_manager_->MakeRequest(
url, kRequestTimeoutMs,
base::BindOnce(&HttpsLatencyRoutine::OnHttpsRequestComplete, weak_ptr()));
}
void HttpsLatencyRoutine::OnHttpsRequestComplete(bool connected) {
request_end_time_ = tick_clock_->NowTicks();
if (!connected) {
failed_connection_ = true;
AnalyzeResultsAndExecuteCallback();
return;
}
const base::TimeDelta latency = request_end_time_ - request_start_time_;
latencies_.emplace_back(latency);
if (hostnames_to_query_https_.size() > 0) {
MakeHttpsRequest();
return;
}
AnalyzeResultsAndExecuteCallback();
}
} // namespace ash::network_diagnostics
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