public async Task InvokeAsync(HttpContext context)
{
switch (context.Request.Path.Value)
{
case "/calculate" when context.Request.Method == "GET":
{
SimpleEquation equation = null;
var operands = context.Request.Query["operands"].ToList();
var operation = context.Request.Query["operation"].ToString();
var stateOperand = context.Request.Query["state_operand"].ToString();
if (stateOperand != "")
{
if (operands.Count != 0)
{
context.Response.StatusCode = 400;
await context.Response.CompleteAsync();
}
var state = context.Request.Cookies["state"];
if (state != "")
{
operands.Add(context.Request.Cookies["state"]);
operands.Add(stateOperand);
}
else if (!context.Response.HasStarted)
{
context.Response.StatusCode = 400;
await context.Response.CompleteAsync();
}
}
try
{
if (!SimpleEquation.TryParse(operation, operands, out equation) &&
!context.Response.HasStarted)
{
context.Response.StatusCode = 400;
await context.Response.CompleteAsync();
}
}
catch (FormatException e)
{
Console.WriteLine(e.StackTrace);
if (!context.Response.HasStarted)
{
context.Response.StatusCode = 400;
await context.Response.CompleteAsync();
}
}
var result = 0.0f;
try
{
result = CalculationService.EvaluateSimpleEquation(equation);
}
catch (Exception e)
{
if (e is not ArithmeticException && e is not NullReferenceException)
{
throw;
}
if (!context.Response.HasStarted)
{
context.Response.StatusCode = 400;
await context.Response.CompleteAsync();
Console.WriteLine(e.StackTrace);
}
}
if (!context.Response.HasStarted)
{
context.Response.StatusCode = 200;
var resultStr = result.ToString();
context.Response.Cookies.Append("state", resultStr);
await context.Response.WriteAsync(resultStr);
}
break;
}
case "/":
{
if (context.Request.Cookies.ContainsKey("auth"))
{
var user = context.Request.Cookies["auth"];
await context.Response.WriteAsync($"Hello {user}");
}
break;
}
default:
context.Response.StatusCode = 404;
break;
}
}