static public async Task HttpHandleAsync(Stream input, Stream output,
Func <HttpRequest, Task <HttpResponse> > handler, CancellationToken cancel = default(CancellationToken))
{
//await Task.Delay(TimeSpan.FromMilliseconds(5000));
//Console.WriteLine(RuntimeHelpers.GetHashCode(client));
using (var reader = new BufferedStreamReader(input))
{
var httpRequest = await reader.ReadLineAsync(8192);
//Console.WriteLine($"httpRequest: {httpRequest}");
var headers = new HttpHeaders();
var headersChars = 0;
while (true)
{
var rawLine = await reader.ReadLineAsync(8192);
headersChars += rawLine.Length;
if (headersChars > 8192)
{
throw new IndexOutOfRangeException("Request headers content is too big");
}
var line = rawLine.Trim();
if (string.IsNullOrEmpty(line))
{
break;
}
var parts = line.Split(':', 2);
headers.Add(parts[0].Trim(), (parts.Length >= 2) ? parts[1].Trim() : "");
}
long contentLength;
long.TryParse(headers.GetFirst("Content-Length") ?? "0", out contentLength);
var limited = reader.Limit(contentLength);
var request = new HttpRequest(httpRequest, headers, limited);
HttpResponse response;
try
{
response = await handler(request);
}
catch (Exception e)
{
response = new HttpResponse(e.Message, HttpStatus.InternalServerError);
}
await limited.SkipRemaining();
//Console.WriteLine(headers);
//Console.WriteLine("Host:" + headers.GetFirst("host"));
var sb = new StringBuilder();
sb.Append($"HTTP/1.1 {response.Status.Code} {response.Status.Message}\r\n");
response.Headers.Replace("Content-Length", response.Body.Length.ToString());
response.Headers.Replace("Connection", "Closed");
foreach (var pair in response.Headers.Items)
{
sb.Append($"{pair.Key}: {pair.Value}\r\n");
}
sb.Append("\r\n");
await output.WriteAsync(new ReadOnlyMemory <byte>(Encoding.UTF8.GetBytes(sb.ToString())),
cancel);
await response.Body.WriteAsync(output);
}
}
ReadLineAsync(this BufferedStreamReader stream, int maxLength = int.MaxValue) => Encoding.UTF8.GetString(await stream.ReadBytesUntil((byte)'\n', maxLength));