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Program.cs
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Program.cs
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using McMaster.Extensions.CommandLineUtils;
using Microsoft.AspNetCore.SignalR.Client;
using Microsoft.Extensions.Logging;
using Newtonsoft.Json;
using System;
using System.Collections.Generic;
using System.ComponentModel.DataAnnotations;
using System.Threading;
using System.Threading.Tasks;
namespace SignalRTester
{
[Command(Name = "simplecurl", Description = "A very simple signalr client")]
[HelpOption("-?")]
internal class Program
{
private bool Exit = false;
private HubConnection connection;
public static int Main(string[] args)
{
return CommandLineApplication.Execute<Program>(args);
}
[Required]
[Option(Description = "The SignalR complete url")]
public string Url { get; }
[Option(Description = "True to write all the traces from signalR client")]
public bool Trace { get; }
private void OnExecute()
{
SetupConnection();
do
{
Thread.Sleep(5000);
} while (Exit == false);
}
private void StartCommandParser()
{
do
{
Console.WriteLine("'send method' to send a message to the method");
Console.WriteLine("'observe method' to observe a message from the method");
Console.WriteLine("'exit now' to finish the application");
string raw = Prompt.GetString("Write your command:");
string[] split = raw.Split(' ');
if (split.Length > 1)
{
string command = split[0];
string parameter = split[1];
switch (command)
{
case "send":
Send(parameter);
break;
case "observe":
Subscribe(parameter);
break;
case "exit":
Exit = true;
Environment.Exit(-1);
break;
}
}
} while (true);
}
private void Send(string methodName)
{
List<object> parameters = new List<object>();
string parameter = string.Empty;
do
{
parameter = Prompt.GetString(
"Write the parameters and press enter or just press enter to send a message without parameters");
if (!string.IsNullOrWhiteSpace(parameter))
{
try
{
object newObject = JsonConvert.DeserializeObject(parameter);
parameters.Add(newObject);
}
catch
{
parameters.Add(parameter);
}
}
} while (!string.IsNullOrWhiteSpace(parameter));
connection.SendCoreAsync(methodName, parameters.ToArray()).Wait();
}
private void SetupConnection()
{
IHubConnectionBuilder builder = new HubConnectionBuilder()
.WithUrl(Url);
if (Trace)
{
builder.ConfigureLogging(logging =>
{
// Log to the Console
logging.AddConsole();
// This will set ALL logging to Debug level
logging.SetMinimumLevel(LogLevel.Debug);
});
}
connection = builder.Build();
connection.Closed += async (error) =>
{
Console.WriteLine("connection closed");
await Task.Delay(new Random().Next(0, 5) * 1000);
Console.WriteLine("Trying to reconnect");
await connection.StartAsync();
};
connection.StartAsync().ContinueWith(task =>
{
if (task.IsFaulted)
{
Console.WriteLine($"There was an error opening the connection:{Url}",
task?.Exception?.GetBaseException());
}
else
{
Console.WriteLine("Connected");
StartCommandParser();
}
});
}
private void Subscribe(string method)
{
int numberOfParameters = Prompt.GetInt("Enter the number of parameters expected");
List<Type> types = new List<Type>();
for (int i = 0; i < numberOfParameters; i++)
{
types.Add(typeof(object));
}
connection.On(method, types.ToArray(), (x) =>
{
Task task = new Task(() =>
{
Console.WriteLine("Message Received: " + method);
foreach (object message in x)
{
Console.WriteLine("Parameter ---------- ");
Console.WriteLine(message);
Console.WriteLine("--------- ---------- ");
}
});
task.RunSynchronously();
return task;
});
}
}
}