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// Copyright 2018 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 "services/network/websocket_throttler.h"
#include <algorithm>
#include "base/rand_util.h"
#include "services/network/public/mojom/network_context.mojom-forward.h"
namespace network {
constexpr int WebSocketPerProcessThrottler::kMaxPendingWebSocketConnections;
WebSocketPerProcessThrottler::PendingConnection::PendingConnection(
base::WeakPtr<WebSocketPerProcessThrottler> throttler)
: throttler_(std::move(throttler)) {
DCHECK(throttler_);
++throttler_->num_pending_connections_;
}
WebSocketPerProcessThrottler::PendingConnection::PendingConnection(
PendingConnection&& other)
: throttler_(std::move(other.throttler_)) {
other.throttler_ = nullptr;
}
WebSocketPerProcessThrottler::PendingConnection::~PendingConnection() {
if (!throttler_)
return;
--throttler_->num_pending_connections_;
++throttler_->num_current_failed_connections_;
}
void WebSocketPerProcessThrottler::PendingConnection::OnCompleteHandshake() {
DCHECK(throttler_);
--throttler_->num_pending_connections_;
++throttler_->num_current_succeeded_connections_;
throttler_ = nullptr;
}
WebSocketPerProcessThrottler::WebSocketPerProcessThrottler() {}
WebSocketPerProcessThrottler::~WebSocketPerProcessThrottler() {}
base::TimeDelta WebSocketPerProcessThrottler::CalculateDelay() const {
int64_t f =
num_previous_failed_connections_ + num_current_failed_connections_;
int64_t s =
num_previous_succeeded_connections_ + num_current_succeeded_connections_;
int p = num_pending_connections_;
return base::TimeDelta::FromMilliseconds(
base::RandInt(1000, 5000) *
(1 << std::min(p + f / (s + 1), INT64_C(16))) / 65536);
}
WebSocketPerProcessThrottler::PendingConnection
WebSocketPerProcessThrottler::IssuePendingConnectionTracker() {
return PendingConnection(weak_factory_.GetWeakPtr());
}
bool WebSocketPerProcessThrottler::IsClean() const {
return num_pending_connections_ == 0 &&
num_current_succeeded_connections_ == 0 &&
num_previous_succeeded_connections_ == 0 &&
num_current_failed_connections_ == 0 &&
num_previous_succeeded_connections_ == 0;
}
void WebSocketPerProcessThrottler::Roll() {
num_previous_succeeded_connections_ = num_current_succeeded_connections_;
num_previous_failed_connections_ = num_current_failed_connections_;
num_current_succeeded_connections_ = 0;
num_current_failed_connections_ = 0;
}
WebSocketThrottler::WebSocketThrottler() {}
WebSocketThrottler::~WebSocketThrottler() {}
bool WebSocketThrottler::HasTooManyPendingConnections(int process_id) const {
auto it = per_process_throttlers_.find(process_id);
if (it == per_process_throttlers_.end())
return false;
return it->second->HasTooManyPendingConnections();
}
base::TimeDelta WebSocketThrottler::CalculateDelay(int process_id) const {
auto it = per_process_throttlers_.find(process_id);
if (it == per_process_throttlers_.end())
return base::TimeDelta();
return it->second->CalculateDelay();
}
base::Optional<WebSocketThrottler::PendingConnection>
WebSocketThrottler::IssuePendingConnectionTracker(int process_id) {
if (process_id == mojom::kBrowserProcessId) {
// The browser process is not throttled.
return base::nullopt;
}
auto it = per_process_throttlers_.find(process_id);
if (it == per_process_throttlers_.end()) {
it = per_process_throttlers_
.insert(std::make_pair(
process_id, std::make_unique<WebSocketPerProcessThrottler>()))
.first;
}
if (!throttling_period_timer_.IsRunning()) {
throttling_period_timer_.Start(FROM_HERE, base::TimeDelta::FromMinutes(2),
this, &WebSocketThrottler::OnTimer);
}
return it->second->IssuePendingConnectionTracker();
}
void WebSocketThrottler::OnTimer() {
auto it = per_process_throttlers_.begin();
while (it != per_process_throttlers_.end()) {
it->second->Roll();
if (it->second->IsClean()) {
// We don't need the entry. Erase it.
it = per_process_throttlers_.erase(it);
} else {
++it;
}
}
if (per_process_throttlers_.empty())
throttling_period_timer_.Stop();
}
} // namespace network
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