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// Copyright 2017 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef REMOTING_PROTOCOL_DATA_CHANNEL_MANAGER_H_
#define REMOTING_PROTOCOL_DATA_CHANNEL_MANAGER_H_
#include <memory>
#include <string>
#include <vector>
#include "base/functional/callback.h"
namespace remoting::protocol {
class MessagePipe;
// DataChannelManager helps to manage optional data channels. Consumers can
// register a function to handle data from a named data channel.
class DataChannelManager final {
public:
using CreateHandlerCallback =
base::RepeatingCallback<void(const std::string& name,
std::unique_ptr<MessagePipe> pipe)>;
DataChannelManager();
~DataChannelManager();
// Registers a factory function to handle a new incoming data channel with a
// name matching |prefix|. Both |constructor| and |prefix| cannot be empty.
// Must be called before OnRegistrationComplete() is called.
void RegisterCreateHandlerCallback(const std::string& prefix,
CreateHandlerCallback constructor);
// Handles all pending data channels and drops those without a matching
// handler. After this method is called, future incoming data channels without
// a matching handler will be silently dropped.
// Must be called exactly once.
void OnRegistrationComplete();
// Executes the registered callback to handle the new incoming data channel.
// If no matching handler is found, and OnRegistrationComplete() has not been
// called, the data channel will be held and handled later, otherwise the data
// channel will be silently dropped.
void OnIncomingDataChannel(const std::string& name,
std::unique_ptr<MessagePipe> pipe);
private:
std::vector<std::pair<std::string, CreateHandlerCallback>> constructors_;
std::vector<std::pair<std::string, std::unique_ptr<MessagePipe>>>
pending_data_channels_;
bool is_registration_complete_ = false;
};
} // namespace remoting::protocol
#endif // REMOTING_PROTOCOL_DATA_CHANNEL_MANAGER_H_
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