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// Copyright 2018 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.
#ifndef NET_DNS_HOST_RESOLVER_MDNS_TASK_H_
#define NET_DNS_HOST_RESOLVER_MDNS_TASK_H_
#include <memory>
#include <string>
#include <vector>
#include "base/containers/unique_ptr_adapters.h"
#include "base/macros.h"
#include "base/memory/weak_ptr.h"
#include "base/sequence_checker.h"
#include "net/base/completion_once_callback.h"
#include "net/dns/host_resolver.h"
#include "net/dns/mdns_client.h"
namespace net {
// Representation of a single HostResolverImpl::Job task to resolve the hostname
// using multicast DNS transactions. Destruction cancels the task and prevents
// any callbacks from being invoked.
class HostResolverMdnsTask {
public:
// |mdns_client| must outlive |this|.
HostResolverMdnsTask(
MDnsClient* mdns_client,
const std::string& hostname,
const std::vector<HostResolver::DnsQueryType>& query_types);
~HostResolverMdnsTask();
// Starts the task. |completion_callback| will be called asynchronously with
// results.
//
// Should only be called once.
void Start(CompletionOnceCallback completion_callback);
const AddressList& result_addresses() { return result_addresses_; }
private:
class Transaction;
void CheckCompletion(bool post_needed);
void CompleteWithResult(int result, bool post_needed);
MDnsClient* const mdns_client_;
const std::string hostname_;
AddressList result_addresses_;
std::vector<Transaction> transactions_;
CompletionOnceCallback completion_callback_;
SEQUENCE_CHECKER(sequence_checker_);
base::WeakPtrFactory<HostResolverMdnsTask> weak_ptr_factory_;
DISALLOW_COPY_AND_ASSIGN(HostResolverMdnsTask);
};
} // namespace net
#endif // NET_DNS_HOST_RESOLVER_MDNS_TASK_H_
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