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Program.cs
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Program.cs
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// Copyright (c) Microsoft. All rights reserved.
// Licensed under the MIT license. See LICENSE file in the project root for full license information.
using System;
using System.IO;
using System.Threading;
using System.Threading.Tasks;
using Microsoft.AspNet.SignalR.Client;
using Microsoft.AspNet.SignalR.Client.Transports;
using Microsoft.Azure.SignalR;
namespace AspNet.ChatSample.CSharpClient
{
class Program
{
private static readonly Func<Task> ReconnectDelayTask = () => DelayRandom(200, 1000);
private static readonly SemaphoreSlim ReconnectLock = new SemaphoreSlim(1);
static async Task Main(string[] args)
{
var url = "http://localhost:8009";
var proxy = await ConnectAsync(url, Console.Out);
var currentUser = Guid.NewGuid().ToString("N");
Mode mode = Mode.Broadcast;
if (args.Length > 0)
{
Enum.TryParse(args[0], true, out mode);
}
Console.WriteLine($"Logged in as user {currentUser}");
var input = Console.ReadLine();
while (!string.IsNullOrEmpty(input))
{
switch (mode)
{
case Mode.Broadcast:
await proxy.Invoke("BroadcastMessage", currentUser, input);
break;
case Mode.Echo:
await proxy.Invoke("echo", input);
break;
default:
break;
}
input = Console.ReadLine();
}
}
private static async Task<IHubProxy> ConnectAsync(string url, TextWriter output, CancellationToken cancellationToken = default)
{
var connection = new HubConnection(url)
{
TraceWriter = output,
TraceLevel = TraceLevels.All
};
connection.Closed += () =>
{
output.WriteLine($"{connection.ConnectionId} is closed");
};
connection.Error += e =>
{
output.WriteLine(e);
_ = StartAsyncWithAlwaysRetry(connection, output, ReconnectDelayTask(), cancellationToken);
};
var hubProxy = connection.CreateHubProxy("ChatHub");
hubProxy.On<string, string>("BroadcastMessage", BroadcastMessage);
hubProxy.On<string>("Echo", Echo);
await StartAsyncWithAlwaysRetry(connection, output, cancellationToken: cancellationToken);
return hubProxy;
}
private static async Task StartAsyncWithAlwaysRetry(HubConnection connection, TextWriter output, Task startDelay = null, CancellationToken cancellationToken = default)
{
// When there is already a reconnect, directly return;
if (!ReconnectLock.Wait(0))
{
return;
}
try
{
if (startDelay != null)
{
await startDelay;
}
while (!cancellationToken.IsCancellationRequested)
{
try
{
// Sometimes Start throws and triggers Error event, however sometimes not.
await connection.Start();
return;
}
catch (Exception e)
{
output.WriteLine($"Error starting: {e.Message}, retry...");
await ReconnectDelayTask();
}
}
}
finally
{
ReconnectLock.Release();
}
}
/// <summary>
/// Delay random milliseconds
/// </summary>
/// <param name="min"></param>
/// <param name="max"></param>
/// <returns></returns>
private static Task DelayRandom(int min, int max)
{
return Task.Delay(StaticRandom.Next(min, max));
}
private static void BroadcastMessage(string name, string message)
{
Console.WriteLine($"{name}: {message}");
}
private static void Echo(string message)
{
Console.WriteLine(message);
}
private enum Mode
{
Broadcast,
Echo,
}
}
}