ControlR.Libraries.WebSocketRelay.Client 0.20.86

ControlR.Libraries.WebSocketRelay.Client

A client library for the WebSocket Relay service, providing managed relay stream connections for real-time data transfer in ControlR remote control applications.

Features

Managed Relay Stream

• IManagedRelayStream: Interface for managing WebSocket relay connections
• ManagedRelayStream: Abstract base implementation with connection management

Connection Management

• Automatic connection handling and reconnection
• Message queue management with configurable buffering
• Close handler registration
• Latency tracking

Performance Monitoring

• CurrentLatency: Real-time latency measurement
• GetMbpsIn(): Inbound throughput monitoring
• GetMbpsOut(): Outbound throughput monitoring

Message Handling

• DTO wrapper support with MessagePack serialization
• Message handler registration for incoming messages
• Async message processing

Usage

Basic Usage

using ControlR.Libraries.WebSocketRelay.Client;
using ControlR.Libraries.Shared.Services.Buffers;
using ControlR.Libraries.Api.Contracts.Dtos.RemoteControlDtos;
using Microsoft.Extensions.Logging;

// Create a concrete implementation or use in your application
public class MyRelayStream : ManagedRelayStream
{
    public MyRelayStream(
        TimeProvider timeProvider,
        IMessenger messenger,
        IMemoryProvider memoryProvider,
        IWaiter waiter,
        ILogger<ManagedRelayStream> logger)
        : base(timeProvider, messenger, memoryProvider, waiter, logger)
    {
    }
}

// Connect to the relay
var relayStream = new MyRelayStream(
    TimeProvider.System,
    messenger,
    memoryProvider,
    waiter,
    logger);

var relayUri = new Uri("wss://relay.example.com/relay");
await relayStream.Connect(relayUri, cancellationToken);

// Check connection status
Console.WriteLine($"Connected: {relayStream.IsConnected}");
Console.WriteLine($"State: {relayStream.State}");
Console.WriteLine($"Latency: {relayStream.CurrentLatency}");

Sending Messages

// Create a DTO wrapper
var dtoWrapper = new DtoWrapper
{
    DtoType = nameof(RemoteControlFrameDto),
    Data = myFrameDto
};

// Send with cancellation support
await relayStream.Send(dtoWrapper, cancellationToken);

Receiving Messages

// Register a message handler
var subscription = relayStream.RegisterMessageHandler(this, async wrapper =>
{
    switch (wrapper.DtoType)
    {
        case nameof(RemoteControlFrameDto):
            var frame = MessagePackSerializer.Deserialize<RemoteControlFrameDto>(wrapper.Data);
            await HandleFrame(frame);
            break;
            
        case nameof(InputEventDto):
            var input = MessagePackSerializer.Deserialize<InputEventDto>(wrapper.Data);
            await HandleInput(input);
            break;
    }
});

// Don't forget to dispose when done
subscription.Dispose();

Monitoring Performance

// Get throughput metrics
double inboundMbps = relayStream.GetMbpsIn();
double outboundMbps = relayStream.GetMbpsOut();

Console.WriteLine($"In: {inboundMbps:F2} Mbps");
Console.WriteLine($"Out: {outboundMbps:F2} Mbps");

Handling Connection Close

// Register a close handler
var closeSubscription = relayStream.OnClosed(async () =>
{
    Console.WriteLine("Connection closed");
    // Handle reconnection logic
});

// Dispose when done
closeSubscription.Dispose();

URI Building

Use RelayUriBuilder to construct relay URIs:

var uri = RelayUriBuilder.Build(
    relayServer: "relay.example.com",
    deviceId: deviceId,
    sessionId: sessionId,
    role: RelayRole.Requester);  // or RelayRole.Provider

Relay Roles

• Requester: The client that requests a relay connection (typically the viewer)
• Provider: The client that provides the connection (typically the agent)

Architecture

The library consists of:

• ManagedRelayStream.cs - Main stream management implementation
• RelayRole.cs - Enum for relay participant roles
• RelayUriBuilder.cs - URI construction helper

Key Properties

Key Methods

Dependencies

This library depends on:

• ControlR.Libraries.Shared
• ControlR.Libraries.Api.Contracts
• Bitbound.SimpleMessenger
• Microsoft.Extensions.Logging
• MessagePack
• System.Net.WebSockets

Use Cases

• Remote desktop viewing and control
• Real-time screen streaming
• Input event relay
• File transfer through relay
• Terminal session tunneling