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// Copyright 2018 The Chromium Authors
// 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/functional/callback_forward.h"
#include "base/memory/raw_ptr.h"
#include "base/memory/weak_ptr.h"
#include "base/sequence_checker.h"
#include "net/dns/host_cache.h"
#include "net/dns/host_resolver.h"
#include "net/dns/mdns_client.h"
#include "net/dns/public/dns_query_type.h"
namespace net {
class RecordParsed;
// 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,
std::string hostname,
DnsQueryTypeSet query_types);
HostResolverMdnsTask(const HostResolverMdnsTask&) = delete;
HostResolverMdnsTask& operator=(const HostResolverMdnsTask&) = delete;
~HostResolverMdnsTask();
// Starts the task. |completion_closure| will be called asynchronously.
//
// Should only be called once.
void Start(base::OnceClosure completion_closure);
// Results only available after invocation of the completion closure.
HostCache::Entry GetResults() const;
static HostCache::Entry ParseResult(int error,
DnsQueryType query_type,
const RecordParsed* parsed,
const std::string& expected_hostname);
private:
class Transaction;
void CheckCompletion(bool post_needed);
void Complete(bool post_needed);
const raw_ptr<MDnsClient> mdns_client_;
const std::string hostname_;
std::vector<Transaction> transactions_;
base::OnceClosure completion_closure_;
SEQUENCE_CHECKER(sequence_checker_);
base::WeakPtrFactory<HostResolverMdnsTask> weak_ptr_factory_{this};
};
} // namespace net
#endif // NET_DNS_HOST_RESOLVER_MDNS_TASK_H_
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