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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 REMOTING_IOS_FACADE_HOST_LIST_SERVICE_H_
#define REMOTING_IOS_FACADE_HOST_LIST_SERVICE_H_
#include <memory>
#include <string>
#include <vector>
#include "base/callback_list.h"
#include "base/macros.h"
#include "base/memory/weak_ptr.h"
#include "base/no_destructor.h"
#include "base/threading/sequence_bound.h"
#include "net/http/http_status_code.h"
#include "remoting/proto/remoting/v1/directory_messages.pb.h"
namespace remoting {
class DirectoryServiceClient;
class ProtobufHttpStatus;
// |HostListService| is the centralized place to retrieve the current signed in
// user's host list.
class HostListService {
public:
enum class State {
// Nobody has requested a host list fetch since login or last failure.
NOT_FETCHED,
// The host list is currently being fetched.
FETCHING,
// The host list has been fetched.
FETCHED,
};
enum class FetchFailureReason {
NETWORK_ERROR,
AUTH_ERROR,
UNKNOWN_ERROR,
};
struct FetchFailureInfo {
FetchFailureReason reason;
std::string localized_description;
};
// Returns the singleton instance.
static HostListService* GetInstance();
~HostListService();
// Registers callback to be called when the host list state is changed.
base::CallbackListSubscription RegisterHostListStateCallback(
const base::RepeatingClosure& callback);
// Registers callback to be called when the host list has failed to fetch.
base::CallbackListSubscription RegisterFetchFailureCallback(
const base::RepeatingClosure& callback);
// Start a request to fetch the host list. Calls either the host list state
// callbacks or fetch failure callbacks during the process.
void RequestFetch();
// Returns the host list. Returns an empty vector if the host list state is
// not |FETCHED|.
const std::vector<apis::v1::HostInfo>& hosts() const { return hosts_; }
State state() const { return state_; }
// Returns the last host list fetch failure. Returns nullptr if the host list
// has never been fetched or the last fetch has succeeded.
const FetchFailureInfo* last_fetch_failure() const {
return last_fetch_failure_.get();
}
private:
friend class base::NoDestructor<HostListService>;
friend class HostListServiceTest;
HostListService();
// For test.
explicit HostListService(
base::SequenceBound<DirectoryServiceClient> directory_client);
void Init();
// Changes the host list state and notifies callbacks.
void SetState(State state);
void HandleHostListResult(
const ProtobufHttpStatus& status,
std::unique_ptr<apis::v1::GetHostListResponse> response);
void HandleFetchFailure(const ProtobufHttpStatus& status);
void OnUserUpdated(bool is_user_signed_in);
id user_update_observer_;
base::RepeatingClosureList host_list_state_callbacks_;
base::RepeatingClosureList fetch_failure_callbacks_;
base::SequenceBound<DirectoryServiceClient> directory_client_;
std::vector<apis::v1::HostInfo> hosts_;
State state_ = State::NOT_FETCHED;
std::unique_ptr<FetchFailureInfo> last_fetch_failure_;
base::WeakPtrFactory<HostListService> weak_factory_{this};
DISALLOW_COPY_AND_ASSIGN(HostListService);
};
} // namespace remoting
#endif // REMOTING_IOS_FACADE_HOST_LIST_SERVICE_H_