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// Copyright 2024 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_MANAGER_SERVICE_ENDPOINT_REQUEST_IMPL_H_
#define NET_DNS_HOST_RESOLVER_MANAGER_SERVICE_ENDPOINT_REQUEST_IMPL_H_
#include <deque>
#include <optional>
#include <set>
#include <string>
#include <vector>
#include "base/containers/linked_list.h"
#include "base/memory/raw_ptr.h"
#include "base/memory/safe_ref.h"
#include "base/memory/weak_ptr.h"
#include "base/sequence_checker.h"
#include "base/time/tick_clock.h"
#include "net/base/network_anonymization_key.h"
#include "net/base/request_priority.h"
#include "net/dns/host_resolver.h"
#include "net/dns/host_resolver_manager.h"
#include "net/dns/host_resolver_manager_job.h"
#include "net/dns/public/resolve_error_info.h"
#include "net/dns/resolve_context.h"
#include "net/log/net_log_with_source.h"
#include "url/scheme_host_port.h"
namespace net {
// Implementation of HostResolver::ServiceEndpointRequest.
class HostResolverManager::ServiceEndpointRequestImpl
: public HostResolver::ServiceEndpointRequest,
public base::LinkNode<HostResolverManager::ServiceEndpointRequestImpl> {
public:
ServiceEndpointRequestImpl(url::SchemeHostPort scheme_host_port,
NetworkAnonymizationKey network_anonymization_key,
NetLogWithSource net_log,
ResolveHostParameters parameters,
base::WeakPtr<ResolveContext> resolve_context,
base::WeakPtr<HostResolverManager> manager,
const base::TickClock* tick_clock);
ServiceEndpointRequestImpl(const ServiceEndpointRequestImpl&) = delete;
ServiceEndpointRequestImpl& operator=(const ServiceEndpointRequestImpl&) =
delete;
~ServiceEndpointRequestImpl() override;
// HostResolver::ServiceEndpointRequest implementations:
int Start(Delegate* delegate) override;
const std::vector<ServiceEndpoint>& GetEndpointResults() override;
const std::set<std::string>& GetDnsAliasResults() override;
bool EndpointsCryptoReady() override;
ResolveErrorInfo GetResolveErrorInfo() override;
const HostCache::EntryStaleness* GetStaleInfo() const override;
bool IsStaleWhileRefresing() const override;
void ChangeRequestPriority(RequestPriority priority) override;
std::string DebugString() const override;
// These should only be called from HostResolver::Job.
void AssignJob(base::SafeRef<Job> job);
void OnJobCompleted(const HostCache::Entry& results, bool obtained_securely);
void OnJobCancelled();
void OnServiceEndpointsChanged();
const NetLogWithSource& net_log() const { return net_log_; }
const ResolveHostParameters& parameters() const { return parameters_; }
RequestPriority priority() const { return priority_; }
void set_priority(RequestPriority priority) { priority_ = priority; }
HostCache* host_cache() const {
return resolve_context_ ? resolve_context_->host_cache() : nullptr;
}
base::WeakPtr<ServiceEndpointRequestImpl> GetWeakPtr();
private:
enum class State {
kNone,
kCheckIPv6Reachability,
kCheckIPv6ReachabilityComplete,
kDoResolveLocally,
kStartJob,
};
int DoLoop(int rv);
int DoCheckIPv6Reachability();
int DoCheckIPv6ReachabilityComplete(int rv);
int DoResolveLocally();
int DoStartJob();
void OnIOComplete(int rv);
void SetFinalizedResultFromLegacyResults(const HostCache::Entry& results);
void MaybeClearStaleResults();
void LogCancelRequest();
void NotifyDelegateOfUpdated();
ClientSocketFactory* GetClientSocketFactory();
State next_state_ = State::kNone;
const HostResolver::Host host_;
const NetworkAnonymizationKey network_anonymization_key_;
const NetLogWithSource net_log_;
ResolveHostParameters parameters_;
base::WeakPtr<ResolveContext> resolve_context_;
base::WeakPtr<HostResolverManager> manager_;
const raw_ptr<const base::TickClock> tick_clock_;
RequestPriority priority_;
// `delegate_` must outlive `this` unless `resolve_context_` becomes invalid.
raw_ptr<Delegate> delegate_;
// Holds the finalized results.
struct FinalizedResult {
FinalizedResult(std::vector<ServiceEndpoint> endpoints,
std::set<std::string> dns_aliases);
~FinalizedResult();
FinalizedResult(FinalizedResult&&);
FinalizedResult& operator=(FinalizedResult&&);
std::vector<ServiceEndpoint> endpoints;
std::set<std::string> dns_aliases;
};
// Set when the endpoint results are finalized.
std::optional<FinalizedResult> finalized_result_;
// These fields are calculated by DoResolveLocally() and consumed by
// DoStartJob().
std::optional<JobKey> job_key_;
std::deque<TaskType> tasks_;
// These fields are set when the cache has stale results and `this` allows to
// lookup the cache. Cleared upon receiving fresh results if `this` allows
// stale results while refreshing.
std::optional<HostCache::EntryStaleness> stale_info_;
std::vector<ServiceEndpoint> stale_endpoints_;
// Set when a job is associated with `this`. Must be valid unless
// `resolve_context_` becomes invalid. Cleared when the endpoints are
// finalized to ensure that `job_` doesn't become a dangling pointer.
std::optional<base::SafeRef<Job>> job_;
ResolveErrorInfo error_info_;
std::vector<TaskType> initial_tasks_;
SEQUENCE_CHECKER(sequence_checker_);
base::WeakPtrFactory<ServiceEndpointRequestImpl> weak_ptr_factory_{this};
};
} // namespace net
#endif // NET_DNS_HOST_RESOLVER_MANAGER_SERVICE_ENDPOINT_REQUEST_IMPL_H_
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