static void SimulateLoad(int numUsers, int numInteractions,
IInteractionMonitor monitor)
{
Thread.CurrentThread.CurrentCulture = new CultureInfo("en-US", false);
var watch = new Stopwatch();
var rnd = new Random(123); // Constant seed for repeatable experiments
Console.Write($"Creating {numUsers:n0} users...\t\t");
watch.Start();
for (var i = 0; i < numUsers; i++)
{
monitor.RegisterUser(i);
}
Console.WriteLine($"done in {watch.Elapsed.TotalSeconds:0.000}");
Console.Write($"Performing {numInteractions:n0} interactions...\t");
watch.Restart();
for (var i = 0; i < numInteractions; i++)
{
var user1 = rnd.Next(numUsers);
var user2 = rnd.Next(numUsers);
monitor.RegisterInteraction(user1, user2);
}
Console.WriteLine($"done in {watch.Elapsed.TotalSeconds:0.000}");
Console.Write($"Getting all interaction groups...\t");
watch.Restart();
var allGroups = monitor.GetAllInteractionGroups();
Console.WriteLine($"done in {watch.Elapsed.TotalSeconds:0.000}");
Console.WriteLine("Number of groups: {0:n0}", allGroups.Count());
}
//private static readonly
private AspNetCoreServirtiumServer(IHostBuilder hostBuilder, IInteractionMonitor monitor, IInteractionTransforms interactionTransforms, int?port)
{
_interactionMonitor = monitor;
_host = hostBuilder.ConfigureWebHostDefaults(webBuilder =>
{
if (port != null)
{
//If a port is specified, override urls with specified port, listening on all available hosts, for HTTP.
webBuilder.UseUrls($"http://*:{port}");
}
webBuilder.Configure(app =>
{
app.Run(async ctx =>
{
var targetHost = new Uri($"{ctx.Request.Scheme}{Uri.SchemeDelimiter}{ctx.Request.Host}");
var requestInteraction = new MarkdownInteraction.Builder()
.Number(_interactionCounter.Bump())
.Method(new System.Net.Http.HttpMethod(ctx.Request.Method))
.Path($"{ctx.Request.Path}{ctx.Request.QueryString}")
//Remap headers from a dictionary of string lists to a list of (string, string) tuples
.RequestHeaders
(
ctx.Request.Headers
.SelectMany(kvp => kvp.Value.Select(val => (kvp.Key, val)))
.ToArray()
)
.Build();
var serviceRequestInteraction = interactionTransforms.TransformClientRequestForRealService(requestInteraction);
var responseFromService = await monitor.GetServiceResponseForRequest(
targetHost,
serviceRequestInteraction,
false);
var clientResponse = interactionTransforms.TransformRealServiceResponseForClient(responseFromService);
//Always remove the 'Transfer-Encoding: chunked' header if present.
//If it's present in the response.Headers collection ast this point, Kestrel expects you to add chunk notation to the body yourself
//However if you just send it with no content-length, Kestrel will add the chunked header and chunk the body for you.
clientResponse = clientResponse
.WithRevisedHeaders(
clientResponse.Headers
.Where((h) => !(h.Name.ToLower() == "transfer-encoding" && h.Value.ToLower() == "chunked")))
.WithReadjustedContentLength();
ctx.Response.OnCompleted(() =>
{
Console.WriteLine($"{requestInteraction.Method} Request to {targetHost}{requestInteraction.Path} returned to client with code {ctx.Response.StatusCode}");
return(Task.CompletedTask);
});
//Transfer adjusted headers to the response going out to the client
foreach ((string headerName, string headerValue) in clientResponse.Headers)
{
if (ctx.Response.Headers.TryGetValue(headerName, out var headerInResponse))
{
ctx.Response.Headers[headerName] = new StringValues(headerInResponse.Append(headerValue).ToArray());
}
else
{
ctx.Response.Headers[headerName] = new StringValues(headerValue);
}
}
if (clientResponse.Body != null)
{
await ctx.Response.WriteAsync(clientResponse.Body.ToString());
}
await ctx.Response.CompleteAsync();
});
});
}).Build();
}
public static AspNetCoreServirtiumServer WithCommandLineArgs(string[] args, IInteractionMonitor monitor, IInteractionTransforms interactionTransforms) => new AspNetCoreServirtiumServer(Host.CreateDefaultBuilder(args), monitor, interactionTransforms, null);
public static AspNetCoreServirtiumServer Default(int port, IInteractionMonitor monitor, Uri serviceHost) => new AspNetCoreServirtiumServer(Host.CreateDefaultBuilder(), monitor, new SimpleInteractionTransforms(serviceHost), port);
public static AspNetCoreServirtiumServer WithTransforms(int port, IInteractionMonitor monitor, IInteractionTransforms interactionTransforms) => new AspNetCoreServirtiumServer(Host.CreateDefaultBuilder(), monitor, interactionTransforms, port);
