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// Copyright (c) 2012 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 "content/browser/loader/throttling_resource_handler.h"
#include "content/public/browser/resource_throttle.h"
#include "content/public/common/resource_response.h"
namespace content {
ThrottlingResourceHandler::ThrottlingResourceHandler(
scoped_ptr<ResourceHandler> next_handler,
int child_id,
int request_id,
ScopedVector<ResourceThrottle> throttles)
: LayeredResourceHandler(next_handler.Pass()),
deferred_stage_(DEFERRED_NONE),
request_id_(request_id),
throttles_(throttles.Pass()),
index_(0),
cancelled_by_resource_throttle_(false) {
for (size_t i = 0; i < throttles_.size(); ++i)
throttles_[i]->set_controller(this);
}
ThrottlingResourceHandler::~ThrottlingResourceHandler() {
}
bool ThrottlingResourceHandler::OnRequestRedirected(int request_id,
const GURL& new_url,
ResourceResponse* response,
bool* defer) {
DCHECK_EQ(request_id_, request_id);
DCHECK(!cancelled_by_resource_throttle_);
*defer = false;
while (index_ < throttles_.size()) {
throttles_[index_]->WillRedirectRequest(new_url, defer);
index_++;
if (cancelled_by_resource_throttle_)
return false;
if (*defer) {
deferred_stage_ = DEFERRED_REDIRECT;
deferred_url_ = new_url;
deferred_response_ = response;
return true; // Do not cancel.
}
}
index_ = 0; // Reset for next time.
return next_handler_->OnRequestRedirected(request_id, new_url, response,
defer);
}
bool ThrottlingResourceHandler::OnWillStart(int request_id,
const GURL& url,
bool* defer) {
DCHECK_EQ(request_id_, request_id);
DCHECK(!cancelled_by_resource_throttle_);
*defer = false;
while (index_ < throttles_.size()) {
throttles_[index_]->WillStartRequest(defer);
index_++;
if (cancelled_by_resource_throttle_)
return false;
if (*defer) {
deferred_stage_ = DEFERRED_START;
deferred_url_ = url;
return true; // Do not cancel.
}
}
index_ = 0; // Reset for next time.
return next_handler_->OnWillStart(request_id, url, defer);
}
bool ThrottlingResourceHandler::OnResponseStarted(int request_id,
ResourceResponse* response,
bool* defer) {
DCHECK_EQ(request_id_, request_id);
DCHECK(!cancelled_by_resource_throttle_);
while (index_ < throttles_.size()) {
throttles_[index_]->WillProcessResponse(defer);
index_++;
if (cancelled_by_resource_throttle_)
return false;
if (*defer) {
deferred_stage_ = DEFERRED_RESPONSE;
deferred_response_ = response;
return true; // Do not cancel.
}
}
index_ = 0; // Reset for next time.
return next_handler_->OnResponseStarted(request_id, response, defer);
}
void ThrottlingResourceHandler::Cancel() {
cancelled_by_resource_throttle_ = true;
controller()->Cancel();
}
void ThrottlingResourceHandler::CancelAndIgnore() {
cancelled_by_resource_throttle_ = true;
controller()->CancelAndIgnore();
}
void ThrottlingResourceHandler::CancelWithError(int error_code) {
cancelled_by_resource_throttle_ = true;
controller()->CancelWithError(error_code);
}
void ThrottlingResourceHandler::Resume() {
DCHECK(!cancelled_by_resource_throttle_);
DeferredStage last_deferred_stage = deferred_stage_;
deferred_stage_ = DEFERRED_NONE;
switch (last_deferred_stage) {
case DEFERRED_NONE:
NOTREACHED();
break;
case DEFERRED_START:
ResumeStart();
break;
case DEFERRED_REDIRECT:
ResumeRedirect();
break;
case DEFERRED_RESPONSE:
ResumeResponse();
break;
}
}
void ThrottlingResourceHandler::ResumeStart() {
DCHECK(!cancelled_by_resource_throttle_);
GURL url = deferred_url_;
deferred_url_ = GURL();
bool defer = false;
if (!OnWillStart(request_id_, url, &defer)) {
controller()->Cancel();
} else if (!defer) {
controller()->Resume();
}
}
void ThrottlingResourceHandler::ResumeRedirect() {
DCHECK(!cancelled_by_resource_throttle_);
GURL new_url = deferred_url_;
deferred_url_ = GURL();
scoped_refptr<ResourceResponse> response;
deferred_response_.swap(response);
bool defer = false;
if (!OnRequestRedirected(request_id_, new_url, response.get(), &defer)) {
controller()->Cancel();
} else if (!defer) {
controller()->Resume();
}
}
void ThrottlingResourceHandler::ResumeResponse() {
DCHECK(!cancelled_by_resource_throttle_);
scoped_refptr<ResourceResponse> response;
deferred_response_.swap(response);
bool defer = false;
if (!OnResponseStarted(request_id_, response.get(), &defer)) {
controller()->Cancel();
} else if (!defer) {
controller()->Resume();
}
}
} // namespace content
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