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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_controller.h"
#include "base/time/time.h"
#include "chrome/browser/devtools/devtools_network_conditions.h"
#include "chrome/browser/devtools/devtools_network_transaction.h"
#include "chrome/browser/profiles/profile.h"
#include "chrome/browser/profiles/profile_io_data.h"
#include "content/public/browser/browser_thread.h"
#include "content/public/browser/resource_context.h"
using content::BrowserThread;
namespace {
const char kDevToolsRequestInitiator[] = "X-DevTools-Request-Initiator";
int64_t kPacketSize = 1500;
} // namespace
DevToolsNetworkController::DevToolsNetworkController()
: weak_ptr_factory_(this) {
}
DevToolsNetworkController::~DevToolsNetworkController() {
}
void DevToolsNetworkController::AddTransaction(
DevToolsNetworkTransaction* transaction) {
DCHECK(thread_checker_.CalledOnValidThread());
transactions_.insert(transaction);
}
void DevToolsNetworkController::RemoveTransaction(
DevToolsNetworkTransaction* transaction) {
DCHECK(thread_checker_.CalledOnValidThread());
DCHECK(transactions_.find(transaction) != transactions_.end());
transactions_.erase(transaction);
if (conditions_ && conditions_->IsThrottling()) {
UpdateThrottles();
throttled_transactions_.erase(std::remove(throttled_transactions_.begin(),
throttled_transactions_.end(), transaction),
throttled_transactions_.end());
ArmTimer();
}
}
void DevToolsNetworkController::SetNetworkState(
const scoped_refptr<DevToolsNetworkConditions> conditions) {
DCHECK_CURRENTLY_ON(BrowserThread::UI);
BrowserThread::PostTask(
content::BrowserThread::IO,
FROM_HERE,
base::Bind(
&DevToolsNetworkController::SetNetworkStateOnIO,
weak_ptr_factory_.GetWeakPtr(),
conditions));
}
void DevToolsNetworkController::SetNetworkStateOnIO(
const scoped_refptr<DevToolsNetworkConditions> conditions) {
DCHECK(thread_checker_.CalledOnValidThread());
if (conditions_ && conditions_->IsThrottling())
UpdateThrottles();
conditions_ = conditions;
if (!conditions || !(conditions->IsThrottling() || conditions->IsOffline())) {
timer_.Stop();
int64_t length = throttled_transactions_.size();
for (int64_t i = 0; i < length; ++i)
throttled_transactions_[i]->FireThrottledCallback();
throttled_transactions_.clear();
}
if (!conditions)
return;
if (conditions_->IsOffline()) {
// Iterate over a copy of set, because failing of transaction could
// result in creating a new one, or (theoretically) destroying one.
Transactions old_transactions(transactions_);
for (Transactions::iterator it = old_transactions.begin();
it != old_transactions.end(); ++it) {
if (transactions_.find(*it) == transactions_.end())
continue;
if (!(*it)->request() || (*it)->failed())
continue;
if (ShouldFail((*it)->request()))
(*it)->Fail();
}
}
if (conditions_->IsThrottling()) {
DCHECK(conditions_->maximal_throughput() != 0);
offset_ = base::TimeTicks::Now();
last_tick_ = 0;
int64_t us_tick_length =
(1000000L * kPacketSize) / conditions_->maximal_throughput();
DCHECK(us_tick_length != 0);
if (us_tick_length == 0)
us_tick_length = 1;
tick_length_ = base::TimeDelta::FromMicroseconds(us_tick_length);
ArmTimer();
}
}
bool DevToolsNetworkController::ShouldFail(
const net::HttpRequestInfo* request) {
DCHECK(thread_checker_.CalledOnValidThread());
DCHECK(request);
if (!conditions_ || !conditions_->IsOffline())
return false;
if (!conditions_->HasMatchingDomain(request->url))
return false;
return !request->extra_headers.HasHeader(kDevToolsRequestInitiator);
}
bool DevToolsNetworkController::ShouldThrottle(
const net::HttpRequestInfo* request) {
DCHECK(thread_checker_.CalledOnValidThread());
DCHECK(request);
if (!conditions_ || !conditions_->IsThrottling())
return false;
if (!conditions_->HasMatchingDomain(request->url))
return false;
return !request->extra_headers.HasHeader(kDevToolsRequestInitiator);
}
void DevToolsNetworkController::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 DevToolsNetworkController::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 DevToolsNetworkController::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(
&DevToolsNetworkController::OnTimer,
weak_ptr_factory_.GetWeakPtr()));
}
void DevToolsNetworkController::ThrottleTransaction(
DevToolsNetworkTransaction* transaction) {
UpdateThrottles();
throttled_transactions_.push_back(transaction);
ArmTimer();
}
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