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// Copyright (c) 2010 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/io_thread.h"
#include "base/command_line.h"
#include "base/leak_tracker.h"
#include "base/logging.h"
#include "chrome/browser/browser_process.h"
#include "chrome/browser/chrome_thread.h"
#include "chrome/browser/net/dns_global.h"
#include "chrome/browser/net/url_fetcher.h"
#include "chrome/common/chrome_switches.h"
#include "net/base/fixed_host_resolver.h"
#include "net/base/host_cache.h"
#include "net/base/host_resolver.h"
#include "net/base/host_resolver_impl.h"
#include "net/base/network_change_notifier.h"
#include "net/url_request/url_request.h"
namespace {
net::HostResolver* CreateGlobalHostResolver(
net::NetworkChangeNotifier* network_change_notifier) {
net::HostResolver* global_host_resolver = NULL;
const CommandLine& command_line = *CommandLine::ForCurrentProcess();
// The FixedHostResolver allows us to send all network requests through
// a designated test server.
if (command_line.HasSwitch(switches::kFixedHost)) {
std::string host =
command_line.GetSwitchValueASCII(switches::kFixedHost);
global_host_resolver = new net::FixedHostResolver(host);
} else {
global_host_resolver =
net::CreateSystemHostResolver(network_change_notifier);
// if (command_line.HasSwitch(switches::kDisableIPv6))
global_host_resolver->SetDefaultAddressFamily(net::ADDRESS_FAMILY_IPV4);
}
return global_host_resolver;
}
} // namespace
// The IOThread object must outlive any tasks posted to the IO thread before the
// Quit task.
template <>
struct RunnableMethodTraits<IOThread> {
void RetainCallee(IOThread* /* io_thread */) {}
void ReleaseCallee(IOThread* /* io_thread */) {}
};
IOThread::IOThread()
: BrowserProcessSubThread(ChromeThread::IO),
globals_(NULL),
prefetch_observer_(NULL),
dns_master_(NULL) {}
IOThread::~IOThread() {
// We cannot rely on our base class to stop the thread since we want our
// CleanUp function to run.
Stop();
DCHECK(!globals_);
}
IOThread::Globals* IOThread::globals() {
DCHECK(ChromeThread::CurrentlyOn(ChromeThread::IO));
return globals_;
}
void IOThread::InitDnsMaster(
bool prefetching_enabled,
base::TimeDelta max_queue_delay,
size_t max_concurrent,
const chrome_common_net::NameList& hostnames_to_prefetch,
ListValue* referral_list) {
DCHECK(ChromeThread::CurrentlyOn(ChromeThread::UI));
message_loop()->PostTask(
FROM_HERE,
NewRunnableMethod(
this,
&IOThread::InitDnsMasterOnIOThread,
prefetching_enabled, max_queue_delay, max_concurrent,
hostnames_to_prefetch, referral_list));
}
void IOThread::ChangedToOnTheRecord() {
DCHECK(ChromeThread::CurrentlyOn(ChromeThread::UI));
message_loop()->PostTask(
FROM_HERE,
NewRunnableMethod(
this,
&IOThread::ChangedToOnTheRecordOnIOThread));
}
void IOThread::Init() {
BrowserProcessSubThread::Init();
DCHECK(!globals_);
globals_ = new Globals;
globals_->network_change_notifier.reset(
net::NetworkChangeNotifier::CreateDefaultNetworkChangeNotifier());
globals_->host_resolver =
CreateGlobalHostResolver(globals_->network_change_notifier.get());
}
void IOThread::CleanUp() {
// Not initialized in Init(). May not be initialized.
if (dns_master_) {
DCHECK(prefetch_observer_);
dns_master_->Shutdown();
// TODO(willchan): Stop reference counting DnsMaster. It's owned by
// IOThread now.
dns_master_->Release();
dns_master_ = NULL;
chrome_browser_net::FreeDnsPrefetchResources();
}
// Not initialized in Init(). May not be initialized.
if (prefetch_observer_) {
globals_->host_resolver->RemoveObserver(prefetch_observer_);
delete prefetch_observer_;
prefetch_observer_ = NULL;
}
// TODO(eroman): hack for http://crbug.com/15513
if (globals_->host_resolver->IsHostResolverImpl()) {
static_cast<net::HostResolverImpl*>(
globals_->host_resolver.get())->Shutdown();
}
delete globals_;
globals_ = NULL;
// URLFetcher and URLRequest instances must NOT outlive the IO thread.
//
// Strictly speaking, URLFetcher's CheckForLeaks() should be done on the
// UI thread. However, since there _shouldn't_ be any instances left
// at this point, it shouldn't be a race.
//
// We check URLFetcher first, since if it has leaked then an associated
// URLRequest will also have leaked. However it is more useful to
// crash showing the callstack of URLFetcher's allocation than its
// URLRequest member.
base::LeakTracker<URLFetcher>::CheckForLeaks();
base::LeakTracker<URLRequest>::CheckForLeaks();
BrowserProcessSubThread::CleanUp();
}
void IOThread::InitDnsMasterOnIOThread(
bool prefetching_enabled,
base::TimeDelta max_queue_delay,
size_t max_concurrent,
chrome_common_net::NameList hostnames_to_prefetch,
ListValue* referral_list) {
DCHECK(ChromeThread::CurrentlyOn(ChromeThread::IO));
CHECK(!dns_master_);
chrome_browser_net::EnableDnsPrefetch(prefetching_enabled);
dns_master_ = new chrome_browser_net::DnsMaster(
globals_->host_resolver, max_queue_delay, max_concurrent);
dns_master_->AddRef();
DCHECK(!prefetch_observer_);
prefetch_observer_ = chrome_browser_net::CreatePrefetchObserver();
globals_->host_resolver->AddObserver(prefetch_observer_);
FinalizeDnsPrefetchInitialization(
dns_master_, prefetch_observer_, hostnames_to_prefetch, referral_list);
}
void IOThread::ChangedToOnTheRecordOnIOThread() {
DCHECK(ChromeThread::CurrentlyOn(ChromeThread::IO));
if (dns_master_) {
// Destroy all evidence of our OTR session.
dns_master_->DnsMaster::DiscardAllResults();
}
// Clear the host cache to avoid showing entries from the OTR session
// in about:net-internals.
if (globals_->host_resolver->IsHostResolverImpl()) {
net::HostCache* host_cache = static_cast<net::HostResolverImpl*>(
globals_->host_resolver.get())->cache();
if (host_cache)
host_cache->clear();
}
}
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