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// Copyright 2014 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/devtools/devtools_network_interceptor.h"
#include "base/time/time.h"
#include "chrome/browser/devtools/devtools_network_conditions.h"
#include "chrome/browser/devtools/devtools_network_transaction.h"
namespace {
int64_t kPacketSize = 1500;
} // namespace
DevToolsNetworkInterceptor::DevToolsNetworkInterceptor()
: conditions_(new DevToolsNetworkConditions()),
weak_ptr_factory_(this) {
}
DevToolsNetworkInterceptor::~DevToolsNetworkInterceptor() {
}
base::WeakPtr<DevToolsNetworkInterceptor>
DevToolsNetworkInterceptor::GetWeakPtr() {
return weak_ptr_factory_.GetWeakPtr();
}
void DevToolsNetworkInterceptor::AddTransaction(
DevToolsNetworkTransaction* transaction) {
DCHECK(transactions_.find(transaction) == transactions_.end());
transactions_.insert(transaction);
}
void DevToolsNetworkInterceptor::RemoveTransaction(
DevToolsNetworkTransaction* transaction) {
DCHECK(transactions_.find(transaction) != transactions_.end());
transactions_.erase(transaction);
if (!conditions_->IsThrottling())
return;
UpdateThrottles();
throttled_transactions_.erase(std::remove(throttled_transactions_.begin(),
throttled_transactions_.end(), transaction),
throttled_transactions_.end());
ArmTimer();
}
void DevToolsNetworkInterceptor::UpdateConditions(
const scoped_refptr<DevToolsNetworkConditions> conditions) {
DCHECK(conditions);
if (conditions_->IsThrottling())
UpdateThrottles();
conditions_ = conditions;
if (conditions->offline()) {
timer_.Stop();
throttled_transactions_.clear();
Transactions old_transactions(transactions_);
Transactions::iterator it = old_transactions.begin();
for (;it != old_transactions.end(); ++it) {
if (transactions_.find(*it) == transactions_.end())
continue;
if (!(*it)->request() || (*it)->failed())
continue;
if (ShouldFail(*it))
(*it)->Fail();
}
return;
}
if (conditions->IsThrottling()) {
DCHECK(conditions->download_throughput() != 0);
offset_ = base::TimeTicks::Now();
last_tick_ = 0;
int64_t us_tick_length =
(1000000L * kPacketSize) / conditions->download_throughput();
DCHECK(us_tick_length != 0);
if (us_tick_length == 0)
us_tick_length = 1;
tick_length_ = base::TimeDelta::FromMicroseconds(us_tick_length);
ArmTimer();
} else {
timer_.Stop();
int64_t length = throttled_transactions_.size();
for (int64_t i = 0; i < length; ++i)
throttled_transactions_[i]->FireThrottledCallback();
throttled_transactions_.clear();
}
}
void DevToolsNetworkInterceptor::UpdateThrottles() {
int64_t last_tick = (base::TimeTicks::Now() - offset_) / tick_length_;
int64_t ticks = last_tick - last_tick_;
last_tick_ = last_tick;
int64_t length = throttled_transactions_.size();
if (!length)
return;
int64_t shift = ticks % length;
for (int64_t i = 0; i < length; ++i) {
throttled_transactions_[i]->DecreaseThrottledByteCount(
(ticks / length) * kPacketSize + (i < shift ? kPacketSize : 0));
}
std::rotate(throttled_transactions_.begin(),
throttled_transactions_.begin() + shift, throttled_transactions_.end());
}
void DevToolsNetworkInterceptor::OnTimer() {
UpdateThrottles();
std::vector<DevToolsNetworkTransaction*> active_transactions;
std::vector<DevToolsNetworkTransaction*> finished_transactions;
size_t length = throttled_transactions_.size();
for (size_t i = 0; i < length; ++i) {
if (throttled_transactions_[i]->throttled_byte_count() < 0)
finished_transactions.push_back(throttled_transactions_[i]);
else
active_transactions.push_back(throttled_transactions_[i]);
}
throttled_transactions_.swap(active_transactions);
length = finished_transactions.size();
for (size_t i = 0; i < length; ++i)
finished_transactions[i]->FireThrottledCallback();
ArmTimer();
}
void DevToolsNetworkInterceptor::ArmTimer() {
size_t length = throttled_transactions_.size();
if (!length)
return;
int64_t min_ticks_left = 0x10000L;
for (size_t i = 0; i < length; ++i) {
int64_t packets_left = (throttled_transactions_[i]->throttled_byte_count() +
kPacketSize - 1) / kPacketSize;
int64_t ticks_left = (i + 1) + length * (packets_left - 1);
if (i == 0 || ticks_left < min_ticks_left)
min_ticks_left = ticks_left;
}
base::TimeTicks desired_time =
offset_ + tick_length_ * (last_tick_ + min_ticks_left);
timer_.Start(
FROM_HERE,
desired_time - base::TimeTicks::Now(),
base::Bind(
&DevToolsNetworkInterceptor::OnTimer,
base::Unretained(this)));
}
void DevToolsNetworkInterceptor::ThrottleTransaction(
DevToolsNetworkTransaction* transaction) {
UpdateThrottles();
throttled_transactions_.push_back(transaction);
ArmTimer();
}
bool DevToolsNetworkInterceptor::ShouldFail(
const DevToolsNetworkTransaction* transaction) {
if (!conditions_->offline())
return false;
if (!transaction->request_initiator().empty())
return false;
return true;
}
bool DevToolsNetworkInterceptor::ShouldThrottle(
const DevToolsNetworkTransaction* transaction) {
if (!conditions_->IsThrottling())
return false;
if (!transaction->request_initiator().empty())
return false;
return true;
}
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