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// Copyright 2008, Google Inc.
// 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 Google 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 BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE 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.
// A DnsSlave object processes hostname lookups
// via DNS on a single thread, waiting for that blocking
// call to complete, and then getting its next hostname
// from its associated DnsMaster object.
// Since this class only is concerned with prefetching
// to warm the underlying DNS cache, the actual IP
// does not need to be recorded. It is necessary to record
// when the lookup finished, so that the associated DnsMaster
// won't (wastefully) ask for the same name in "too short a
// period of time."
// This class does no "de-duping," and merely slavishly services
// items supplied by its DnsMaster.
#ifndef CHROME_BROWSER_NET_DNS_SLAVE_H__
#define CHROME_BROWSER_NET_DNS_SLAVE_H__
#include <windows.h>
#include <string>
#include "base/basictypes.h"
namespace chrome_browser_net {
class DnsMaster;
class DnsSlave;
// Support testing infrastructure, and allow off-line testing.
typedef void (__stdcall *FreeAddrInfoFunction)(struct addrinfo* ai);
typedef int (__stdcall *GetAddrInfoFunction)(const char* nodename,
const char* servname,
const struct addrinfo* hints,
struct addrinfo** result);
void SetAddrinfoCallbacks(GetAddrInfoFunction getaddrinfo,
FreeAddrInfoFunction freeaddrinfo);
GetAddrInfoFunction get_getaddrinfo();
FreeAddrInfoFunction get_freeaddrinfo();
class DnsSlave {
public:
DnsSlave(DnsMaster* master, int slave_index)
: slave_index_(slave_index),
master_(master) {
}
~DnsSlave() {
master_ = NULL;
}
static DWORD WINAPI ThreadStart(void* pThis);
unsigned Run();
private:
std::string hostname_; // Name being looked up.
DnsMaster* master_; // Master that started us.
int slave_index_; // Our index into DnsMaster's array.
void BlockingDnsLookup();
DISALLOW_EVIL_CONSTRUCTORS(DnsSlave);
};
} // namespace chrome_browser_net
#endif // CHROME_BROWSER_NET_DNS_SLAVE_H__
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