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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.
// 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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