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/** ---------------------------------------------------------------------------
Copyright (c) 2011, Code Aurora Forum. All rights reserved.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are
met:
* Redistributions of source code must retain the above copyright
notice, this list of conditions and the following disclaimer.
* Redistributions in binary form must reproduce the above
copyright notice, this list of conditions and the following
disclaimer in the documentation and/or other materials provided
with the distribution.
* Neither the name of Code Aurora Forum, Inc. nor the names of its
contributors may be used to endorse or promote products derived
from this software without specific prior written permission.
THIS SOFTWARE IS PROVIDED "AS IS" AND ANY EXPRESS OR IMPLIED
WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT
ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS
BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-----------------------------------------------------------------------------**/
#ifndef __DNSRESOLVERHELPER_H__
#define __DNSRESOLVERHELPER_H__
#include <vector>
#include <string>
#include "config.h"
#include "net/base/host_resolver.h"
#include "net/base/address_list.h"
#include "net/base/net_log.h"
#include "net/base/net_errors.h"
#include "base/message_loop.h"
#include "net/base/completion_callback.h"
#include "hosts_provider.h"
//This class does DNS pre-resolution and should be used by net::HostResolver
//It's lifetime is depending on the host resolver and they should be created and destroyed
// in the correct order
//TODO: make sure the resolver is never destroyed before the pre-resolver
class HostResolverHelper: public net::HostResolver::HostnameResolverExt {
public:
HostResolverHelper(net::HostResolver* hostresolver);
virtual ~HostResolverHelper();
///////////////////////////////////////////////////////////////////////////////////////
// net::HostResolver::HostnamePreresolver interface
virtual void Resolve() {
MessageLoop::current()->PostDelayedTask(FROM_HERE, NewRunnableFunction(&HostResolverHelper::DoResolve, this),
500);
}
///////////////////////////////////////////////////////////////////////////////////////
//task which is executed through the message loop
static void DoResolve(HostResolverHelper* obj);
//call it to connect with the hostnames provider
void Init(HostsProvider* provider);
private:
//to be called when hosts pre-resolution is requested (worker function)
bool StartHostsResolution();
private:
int num_of_hosts_to_resolve;
net::HostResolver* hostresolver_;
HostsProvider* hostname_provider_;
// Delegate interface, for notification when the ResolveRequest completes.
class HostInfo: public base::RefCounted<HostInfo> {
public:
net::AddressList addrlist;
net::HostResolver::RequestInfo reqinfo;
net::HostResolver::RequestHandle reqhandle;
bool pending;
net::CompletionCallbackImpl<HostInfo> completion_callback_;
HostInfo(const std::string& hostname);
~HostInfo() {
}
void OnLookupFinished(int result);
};
std::vector<scoped_refptr<HostInfo> > hostinfo_list_;
//used to cancel all pending requests before issuing new ones
void CancelAllRequests();
void PrepareRequestsData(const std::vector<std::string>& hostnames);
};
//intialization for the webkit
net::HostResolver::HostnameResolverExt* CreateResolverIPObserver(net::HostResolver* hostResolver);
#endif
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