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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 OSP_PUBLIC_PROTOCOL_CONNECTION_SERVER_H_
#define OSP_PUBLIC_PROTOCOL_CONNECTION_SERVER_H_
#include <memory>
#include <ostream>
#include <string>
#include <vector>
#include "osp/public/endpoint_request_ids.h"
#include "osp/public/message_demuxer.h"
#include "osp/public/protocol_connection.h"
#include "osp/public/server_config.h"
#include "osp_base/error.h"
#include "osp_base/ip_address.h"
#include "osp_base/macros.h"
namespace openscreen {
class ProtocolConnectionServer {
public:
enum class State {
kStopped = 0,
kStarting,
kRunning,
kStopping,
kSuspended,
};
class Observer : public ProtocolConnectionServiceObserver {
public:
virtual ~Observer() = default;
// Called when the state becomes kSuspended.
virtual void OnSuspended() = 0;
virtual void OnIncomingConnection(
std::unique_ptr<ProtocolConnection> connection) = 0;
};
virtual ~ProtocolConnectionServer();
// Starts the server, listening for new connections on the endpoints in the
// config object. Returns true if state() == kStopped and the service will be
// started, false otherwise.
virtual bool Start() = 0;
// Stops the server and frees any resources associated with the server
// instance. Returns true if state() != (kStopped|kStopping).
virtual bool Stop() = 0;
// NOTE: We need to decide if suspend/resume semantics for QUIC connections
// are well defined, and if we can resume the server and existing connections
// in a consistent and useful state.
// Temporarily stops accepting new connections and sending/receiving data on
// existing connections. Any resources associated with existing connections
// are not freed.
virtual bool Suspend() = 0;
// Resumes exchange of data on existing connections and acceptance of new
// connections.
virtual bool Resume() = 0;
virtual void RunTasks() = 0;
// Synchronously open a new connection to an endpoint identified by
// |endpoint_id|. Returns nullptr if it can't be completed synchronously
// (e.g. there are no existing open connections to that endpoint).
virtual std::unique_ptr<ProtocolConnection> CreateProtocolConnection(
uint64_t endpoint_id) = 0;
MessageDemuxer* message_demuxer() const { return demuxer_; }
EndpointRequestIds* endpoint_request_ids() { return &endpoint_request_ids_; }
// Returns the current state of the listener.
State state() const { return state_; }
// Returns the last error reported by this client.
const Error& last_error() const { return last_error_; }
protected:
explicit ProtocolConnectionServer(MessageDemuxer* demuxer,
Observer* observer);
State state_ = State::kStopped;
Error last_error_;
MessageDemuxer* const demuxer_;
EndpointRequestIds endpoint_request_ids_;
Observer* const observer_;
OSP_DISALLOW_COPY_AND_ASSIGN(ProtocolConnectionServer);
};
std::ostream& operator<<(std::ostream& os,
ProtocolConnectionServer::State state);
} // namespace openscreen
#endif // OSP_PUBLIC_PROTOCOL_CONNECTION_SERVER_H_
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