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// Copyright 2020 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 CAST_SENDER_CAST_PLATFORM_CLIENT_H_
#define CAST_SENDER_CAST_PLATFORM_CLIENT_H_
#include <functional>
#include <map>
#include <memory>
#include <string>
#include <vector>
#include "absl/types/optional.h"
#include "cast/common/channel/cast_message_handler.h"
#include "cast/sender/channel/message_util.h"
#include "util/alarm.h"
#include "util/json/json_value.h"
namespace openscreen {
namespace cast {
struct ServiceInfo;
class VirtualConnectionRouter;
// This class handles Cast messages that generally relate to the "platform", in
// other words not a specific app currently running (e.g. app availability,
// receiver status). These messages follow a request/response format, so each
// request requires a corresponding response callback. These requests will also
// timeout if there is no response after a certain amount of time (currently 5
// seconds). The timeout callbacks will be called on the thread managed by
// |task_runner|.
class CastPlatformClient final : public CastMessageHandler {
public:
using AppAvailabilityCallback =
std::function<void(const std::string& app_id, AppAvailabilityResult)>;
CastPlatformClient(VirtualConnectionRouter* router,
ClockNowFunctionPtr clock,
TaskRunner* task_runner);
~CastPlatformClient() override;
// Requests availability information for |app_id| from the receiver identified
// by |device_id|. |callback| will be called exactly once with a result.
absl::optional<int> RequestAppAvailability(const std::string& device_id,
const std::string& app_id,
AppAvailabilityCallback callback);
// Notifies this object about general receiver connectivity or property
// changes.
void AddOrUpdateReceiver(const ServiceInfo& device, int socket_id);
void RemoveReceiver(const ServiceInfo& device);
void CancelRequest(int request_id);
private:
struct AvailabilityRequest {
int request_id;
std::string app_id;
std::unique_ptr<Alarm> timeout;
AppAvailabilityCallback callback;
};
struct PendingRequests {
std::vector<AvailabilityRequest> availability;
};
// CastMessageHandler overrides.
void OnMessage(VirtualConnectionRouter* router,
CastSocket* socket,
::cast::channel::CastMessage message) override;
void HandleResponse(const std::string& device_id,
int request_id,
const Json::Value& message);
void CancelAppAvailabilityRequest(int request_id);
static int GetNextRequestId();
static int next_request_id_;
const std::string sender_id_;
VirtualConnectionRouter* const virtual_conn_router_;
std::map<std::string /* device_id */, int> socket_id_by_device_id_;
std::map<std::string /* device_id */, PendingRequests>
pending_requests_by_device_id_;
const ClockNowFunctionPtr clock_;
TaskRunner* const task_runner_;
};
} // namespace cast
} // namespace openscreen
#endif // CAST_SENDER_CAST_PLATFORM_CLIENT_H_
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