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// Copyright 2025 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "net/http/http_stream_pool_ip_endpoint_state_tracker.h"
#include <map>
#include <optional>
#include "base/memory/raw_ptr.h"
#include "base/values.h"
#include "net/base/ip_endpoint.h"
#include "net/base/net_export.h"
#include "net/dns/host_resolver.h"
#include "net/dns/public/host_resolver_results.h"
#include "net/http/http_stream_pool.h"
namespace net {
HttpStreamPool::IPEndPointStateTracker::IPEndPointStateTracker(
Delegate* delegate)
: delegate_(delegate) {
CHECK(delegate_);
}
HttpStreamPool::IPEndPointStateTracker::~IPEndPointStateTracker() = default;
std::optional<HttpStreamPool::IPEndPointStateTracker::IPEndPointState>
HttpStreamPool::IPEndPointStateTracker::GetState(
const IPEndPoint& ip_endpoint) const {
auto it = ip_endpoint_states_.find(ip_endpoint);
if (it == ip_endpoint_states_.end()) {
return std::nullopt;
} else {
return it->second;
}
}
void HttpStreamPool::IPEndPointStateTracker::OnEndpointSlow(
const IPEndPoint& ip_endpoint) {
// This will not overwrite the previous value, if it's already tagged as
// kSlowSucceeded (Nor will it overwrite other values).
ip_endpoint_states_.emplace(ip_endpoint, IPEndPointState::kSlowAttempting);
prefer_ipv6_ = !ip_endpoint.address().IsIPv6();
}
void HttpStreamPool::IPEndPointStateTracker::OnEndpointSlowSucceeded(
const IPEndPoint& ip_endpoint) {
auto it = ip_endpoint_states_.find(ip_endpoint);
CHECK(it != ip_endpoint_states_.end());
it->second = IPEndPointState::kSlowSucceeded;
}
void HttpStreamPool::IPEndPointStateTracker::OnEndpointFailed(
const IPEndPoint& ip_endpoint) {
ip_endpoint_states_.insert_or_assign(ip_endpoint, IPEndPointState::kFailed);
}
void HttpStreamPool::IPEndPointStateTracker::RemoveSlowAttemptingEndpoint() {
std::erase_if(ip_endpoint_states_, [](const auto& it) {
return it.second == IPEndPointState::kSlowAttempting;
});
}
std::optional<IPEndPoint>
HttpStreamPool::IPEndPointStateTracker::GetIPEndPointToAttemptTcpBased(
std::optional<IPEndPoint> exclude_ip_endpoint) {
// TODO(crbug.com/383824591): Add a trace event to see if this method is
// time consuming.
HostResolver::ServiceEndpointRequest* service_endpoint_request =
delegate_->GetServiceEndpointRequest();
if (!service_endpoint_request ||
service_endpoint_request->GetEndpointResults().empty()) {
return std::nullopt;
}
const bool svcb_optional = delegate_->IsSvcbOptional();
std::optional<IPEndPoint> current_endpoint;
std::optional<IPEndPointState> current_state;
for (bool ip_v6 : {prefer_ipv6_, !prefer_ipv6_}) {
for (const auto& service_endpoint :
service_endpoint_request->GetEndpointResults()) {
if (!delegate_->IsEndpointUsableForTcpBasedAttempt(service_endpoint,
svcb_optional)) {
continue;
}
const std::vector<IPEndPoint>& ip_endpoints =
ip_v6 ? service_endpoint.ipv6_endpoints
: service_endpoint.ipv4_endpoints;
FindBetterIPEndPoint(ip_endpoints, exclude_ip_endpoint, current_state,
current_endpoint);
if (current_endpoint.has_value() && !current_state.has_value()) {
// This endpoint is fast or no connection attempt has been made to
// it yet.
return current_endpoint;
}
}
}
// No available IP endpoint, or `current_endpoint` is slow.
return current_endpoint;
}
void HttpStreamPool::IPEndPointStateTracker::FindBetterIPEndPoint(
const std::vector<IPEndPoint>& ip_endpoints,
std::optional<IPEndPoint> exclude_ip_endpoint,
std::optional<IPEndPointState>& current_state,
std::optional<IPEndPoint>& current_endpoint) {
for (const auto& ip_endpoint : ip_endpoints) {
if (exclude_ip_endpoint.has_value() &&
ip_endpoint == *exclude_ip_endpoint) {
continue;
}
auto it = ip_endpoint_states_.find(ip_endpoint);
if (it == ip_endpoint_states_.end()) {
// If there is no state for the IP endpoint it means that we haven't tried
// the endpoint yet or previous attempt to the endpoint was fast. Just use
// it.
current_endpoint = ip_endpoint;
current_state = std::nullopt;
return;
}
switch (it->second) {
case IPEndPointState::kFailed:
continue;
case IPEndPointState::kSlowAttempting:
if (!current_endpoint.has_value() &&
!delegate_->HasEnoughTcpBasedAttemptsForSlowIPEndPoint(
ip_endpoint)) {
current_endpoint = ip_endpoint;
current_state = it->second;
}
continue;
case IPEndPointState::kSlowSucceeded:
const bool prefer_slow_succeeded =
!current_state.has_value() ||
*current_state == IPEndPointState::kSlowAttempting;
if (prefer_slow_succeeded &&
!delegate_->HasEnoughTcpBasedAttemptsForSlowIPEndPoint(
ip_endpoint)) {
current_endpoint = ip_endpoint;
current_state = it->second;
}
continue;
}
}
}
base::Value::List HttpStreamPool::IPEndPointStateTracker::GetInfoAsValue()
const {
base::Value::List list;
for (const auto& [ip_endpoint, state] : ip_endpoint_states_) {
list.Append(base::Value::Dict()
.Set("ip_endpoint", ip_endpoint.ToString())
.Set("state", static_cast<int>(state)));
}
return list;
}
} // namespace net
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