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// Copyright (c) 2011 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/net/url_request_slow_download_job.h"
#include "base/compiler_specific.h"
#include "base/message_loop.h"
#include "base/stringprintf.h"
#include "base/string_util.h"
#include "googleurl/src/gurl.h"
#include "net/base/io_buffer.h"
#include "net/base/net_errors.h"
#include "net/http/http_response_headers.h"
#include "net/url_request/url_request.h"
#include "net/url_request/url_request_filter.h"
#include "net/url_request/url_request_status.h"
const int kFirstDownloadSize = 1024 * 35;
const int kSecondDownloadSize = 1024 * 10;
const char URLRequestSlowDownloadJob::kUnknownSizeUrl[] =
"http://url.handled.by.slow.download/download-unknown-size";
const char URLRequestSlowDownloadJob::kKnownSizeUrl[] =
"http://url.handled.by.slow.download/download-known-size";
const char URLRequestSlowDownloadJob::kFinishDownloadUrl[] =
"http://url.handled.by.slow.download/download-finish";
const char URLRequestSlowDownloadJob::kErrorFinishDownloadUrl[] =
"http://url.handled.by.slow.download/download-error";
std::vector<URLRequestSlowDownloadJob*>
URLRequestSlowDownloadJob::pending_requests_;
// Return whether this is the finish or error URL.
static bool IsCompletionUrl(const GURL& url) {
if (url.spec() == URLRequestSlowDownloadJob::kFinishDownloadUrl)
return true;
return (url.spec() == URLRequestSlowDownloadJob::kErrorFinishDownloadUrl);
}
void URLRequestSlowDownloadJob::Start() {
MessageLoop::current()->PostTask(
FROM_HERE,
method_factory_.NewRunnableMethod(
&URLRequestSlowDownloadJob::StartAsync));
}
// static
void URLRequestSlowDownloadJob::AddUrlHandler() {
net::URLRequestFilter* filter = net::URLRequestFilter::GetInstance();
filter->AddUrlHandler(GURL(kUnknownSizeUrl),
&URLRequestSlowDownloadJob::Factory);
filter->AddUrlHandler(GURL(kKnownSizeUrl),
&URLRequestSlowDownloadJob::Factory);
filter->AddUrlHandler(GURL(kFinishDownloadUrl),
&URLRequestSlowDownloadJob::Factory);
filter->AddUrlHandler(GURL(kErrorFinishDownloadUrl),
&URLRequestSlowDownloadJob::Factory);
}
/*static */
net::URLRequestJob* URLRequestSlowDownloadJob::Factory(
net::URLRequest* request,
const std::string& scheme) {
URLRequestSlowDownloadJob* job = new URLRequestSlowDownloadJob(request);
if (!IsCompletionUrl(request->url()))
URLRequestSlowDownloadJob::pending_requests_.push_back(job);
return job;
}
/* static */
void URLRequestSlowDownloadJob::FinishPendingRequests(bool error) {
typedef std::vector<URLRequestSlowDownloadJob*> JobList;
for (JobList::iterator it = pending_requests_.begin(); it !=
pending_requests_.end(); ++it) {
if (error) {
(*it)->set_should_error_download();
} else {
(*it)->set_should_finish_download();
}
}
pending_requests_.clear();
}
URLRequestSlowDownloadJob::URLRequestSlowDownloadJob(net::URLRequest* request)
: net::URLRequestJob(request),
first_download_size_remaining_(kFirstDownloadSize),
should_finish_download_(false),
should_send_second_chunk_(false),
should_error_download_(false),
ALLOW_THIS_IN_INITIALIZER_LIST(method_factory_(this)) {}
void URLRequestSlowDownloadJob::StartAsync() {
if (IsCompletionUrl(request_->url())) {
URLRequestSlowDownloadJob::FinishPendingRequests(
request_->url().spec() == kErrorFinishDownloadUrl);
}
NotifyHeadersComplete();
}
bool URLRequestSlowDownloadJob::ReadRawData(net::IOBuffer* buf, int buf_size,
int *bytes_read) {
if (IsCompletionUrl(request_->url())) {
*bytes_read = 0;
return true;
}
if (should_send_second_chunk_) {
DCHECK(buf_size > kSecondDownloadSize);
for (int i = 0; i < kSecondDownloadSize; ++i) {
buf->data()[i] = '*';
}
*bytes_read = kSecondDownloadSize;
should_send_second_chunk_ = false;
return true;
}
if (first_download_size_remaining_ > 0) {
int send_size = std::min(first_download_size_remaining_, buf_size);
for (int i = 0; i < send_size; ++i) {
buf->data()[i] = '*';
}
*bytes_read = send_size;
first_download_size_remaining_ -= send_size;
DCHECK(!is_done());
return true;
}
if (should_finish_download_) {
*bytes_read = 0;
return true;
}
// If we make it here, the first chunk has been sent and we need to wait
// until a request is made for kFinishDownloadUrl.
SetStatus(net::URLRequestStatus(net::URLRequestStatus::IO_PENDING, 0));
MessageLoop::current()->PostDelayedTask(
FROM_HERE,
method_factory_.NewRunnableMethod(
&URLRequestSlowDownloadJob::CheckDoneStatus),
100);
// Return false to signal there is pending data.
return false;
}
void URLRequestSlowDownloadJob::CheckDoneStatus() {
if (should_finish_download_) {
should_send_second_chunk_ = true;
SetStatus(net::URLRequestStatus());
NotifyReadComplete(kSecondDownloadSize);
} else if (should_error_download_) {
NotifyDone(
net::URLRequestStatus(net::URLRequestStatus::FAILED, net::ERR_FAILED));
} else {
MessageLoop::current()->PostDelayedTask(
FROM_HERE,
method_factory_.NewRunnableMethod(
&URLRequestSlowDownloadJob::CheckDoneStatus),
100);
}
}
// Public virtual version.
void URLRequestSlowDownloadJob::GetResponseInfo(net::HttpResponseInfo* info) {
// Forward to private const version.
GetResponseInfoConst(info);
}
URLRequestSlowDownloadJob::~URLRequestSlowDownloadJob() {}
// Private const version.
void URLRequestSlowDownloadJob::GetResponseInfoConst(
net::HttpResponseInfo* info) const {
// Send back mock headers.
std::string raw_headers;
if (IsCompletionUrl(request_->url())) {
raw_headers.append(
"HTTP/1.1 200 OK\n"
"Content-type: text/plain\n");
} else {
raw_headers.append(
"HTTP/1.1 200 OK\n"
"Content-type: application/octet-stream\n"
"Cache-Control: max-age=0\n");
if (request_->url().spec() == kKnownSizeUrl) {
raw_headers.append(base::StringPrintf(
"Content-Length: %d\n",
kFirstDownloadSize + kSecondDownloadSize));
}
}
// ParseRawHeaders expects \0 to end each header line.
ReplaceSubstringsAfterOffset(&raw_headers, 0, "\n", std::string("\0", 1));
info->headers = new net::HttpResponseHeaders(raw_headers);
}
bool URLRequestSlowDownloadJob::GetMimeType(std::string* mime_type) const {
net::HttpResponseInfo info;
GetResponseInfoConst(&info);
return info.headers && info.headers->GetMimeType(mime_type);
}
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