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// Copyright (c) 2006-2008 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/url_fetcher.h"
#include "base/string_util.h"
#include "base/thread.h"
#include "chrome/browser/browser_process.h"
#include "chrome/browser/chrome_thread.h"
#include "chrome/browser/net/dns_master.h"
#include "googleurl/src/gurl.h"
#include "net/base/load_flags.h"
URLFetcher::URLFetcher(const GURL& url,
RequestType request_type,
Delegate* d)
#pragma warning(suppress: 4355) // Okay to pass "this" here.
: core_(new Core(this, url, request_type, d)) {
}
URLFetcher::~URLFetcher() {
core_->Stop();
}
URLFetcher::Core::Core(URLFetcher* fetcher,
const GURL& original_url,
RequestType request_type,
URLFetcher::Delegate* d)
: fetcher_(fetcher),
original_url_(original_url),
request_type_(request_type),
delegate_(d),
delegate_loop_(MessageLoop::current()),
io_loop_(ChromeThread::GetMessageLoop(ChromeThread::IO)),
request_(NULL),
response_code_(-1),
load_flags_(net::LOAD_NORMAL),
protect_entry_(URLFetcherProtectManager::GetInstance()->Register(
original_url_.host())),
num_retries_(0) {
}
void URLFetcher::Core::Start() {
DCHECK(delegate_loop_);
DCHECK(io_loop_);
DCHECK(request_context_) << "We need an URLRequestContext!";
io_loop_->PostDelayedTask(FROM_HERE, NewRunnableMethod(
this, &Core::StartURLRequest),
protect_entry_->UpdateBackoff(URLFetcherProtectEntry::SEND));
}
void URLFetcher::Core::Stop() {
DCHECK_EQ(MessageLoop::current(), delegate_loop_);
delegate_ = NULL;
io_loop_->PostTask(FROM_HERE, NewRunnableMethod(
this, &Core::CancelURLRequest));
}
void URLFetcher::Core::OnResponseStarted(URLRequest* request) {
DCHECK(request == request_);
DCHECK(MessageLoop::current() == io_loop_);
if (request_->status().is_success()) {
response_code_ = request_->GetResponseCode();
response_headers_ = request_->response_headers();
}
int bytes_read = 0;
// Some servers may treat HEAD requests as GET requests. To free up the
// network connection as soon as possible, signal that the request has
// completed immediately, without trying to read any data back (all we care
// about is the response code and headers, which we already have).
if (request_->status().is_success() && (request_type_ != HEAD))
request_->Read(buffer_, sizeof(buffer_), &bytes_read);
OnReadCompleted(request_, bytes_read);
}
void URLFetcher::Core::OnReadCompleted(URLRequest* request, int bytes_read) {
DCHECK(request == request_);
DCHECK(MessageLoop::current() == io_loop_);
url_ = request->url();
do {
if (!request_->status().is_success() || bytes_read <= 0)
break;
data_.append(buffer_, bytes_read);
} while (request_->Read(buffer_, sizeof(buffer_), &bytes_read));
if (request_->status().is_success())
request_->GetResponseCookies(&cookies_);
// See comments re: HEAD requests in OnResponseStarted().
if (!request_->status().is_io_pending() || (request_type_ == HEAD)) {
delegate_loop_->PostTask(FROM_HERE, NewRunnableMethod(
this, &Core::OnCompletedURLRequest, request_->status()));
delete request_;
request_ = NULL;
}
}
void URLFetcher::Core::StartURLRequest() {
DCHECK(MessageLoop::current() == io_loop_);
DCHECK(!request_);
request_ = new URLRequest(original_url_, this);
request_->set_load_flags(
request_->load_flags() | net::LOAD_DISABLE_INTERCEPT | load_flags_);
request_->set_context(request_context_.get());
switch (request_type_) {
case GET:
break;
case POST:
DCHECK(!upload_content_.empty());
DCHECK(!upload_content_type_.empty());
request_->set_method("POST");
if (!extra_request_headers_.empty())
extra_request_headers_ += "\r\n";
StringAppendF(&extra_request_headers_,
"Content-Length: %d\r\nContent-Type: %s",
upload_content_.size(), upload_content_type_.c_str());
request_->AppendBytesToUpload(upload_content_.data(),
static_cast<int>(upload_content_.size()));
break;
case HEAD:
request_->set_method("HEAD");
break;
default:
NOTREACHED();
}
if (!extra_request_headers_.empty())
request_->SetExtraRequestHeaders(extra_request_headers_);
request_->Start();
}
void URLFetcher::Core::CancelURLRequest() {
DCHECK(MessageLoop::current() == io_loop_);
if (request_) {
request_->Cancel();
delete request_;
request_ = NULL;
}
// Release the reference to the request context. There could be multiple
// references to URLFetcher::Core at this point so it may take a while to
// delete the object, but we cannot delay the destruction of the request
// context.
request_context_ = NULL;
}
void URLFetcher::Core::OnCompletedURLRequest(const URLRequestStatus& status) {
DCHECK(MessageLoop::current() == delegate_loop_);
// Checks the response from server.
if (response_code_ >= 500) {
// When encountering a server error, we will send the request again
// after backoff time.
const int wait =
protect_entry_->UpdateBackoff(URLFetcherProtectEntry::FAILURE);
++num_retries_;
// Restarts the request if we still need to notify the delegate.
if (delegate_) {
if (num_retries_ <= protect_entry_->max_retries()) {
io_loop_->PostDelayedTask(FROM_HERE, NewRunnableMethod(
this, &Core::StartURLRequest), wait);
} else {
delegate_->OnURLFetchComplete(fetcher_, url_, status, response_code_,
cookies_, data_);
}
}
} else {
protect_entry_->UpdateBackoff(URLFetcherProtectEntry::SUCCESS);
if (delegate_)
delegate_->OnURLFetchComplete(fetcher_, url_, status, response_code_,
cookies_, data_);
}
}
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