Added UnstableRestClientProvider

src/Discord.Net.DebugTools/UnstableRestClient.cs

@@ -0,0 +1,154 @@
+using Newtonsoft.Json;
+using System;
+using System.Collections.Generic;
+using System.Globalization;
+using System.IO;
+using System.Linq;
+using System.Net;
+using System.Net.Http;
+using System.Text;
+using System.Threading;
+using System.Threading.Tasks;
+
+namespace Discord.Net.Rest
+{
+    internal sealed class UnstableRestClient : IRestClient, IDisposable
+    {
+        private const double FailureRate = 0.10; //10%
+
+        private const int HR_SECURECHANNELFAILED = -2146233079;
+
+        private readonly HttpClient _client;
+        private readonly string _baseUrl;
+        private readonly JsonSerializer _errorDeserializer;
+        private readonly Random _rand;
+        private CancellationToken _cancelToken;
+        private bool _isDisposed;
+
+        public DefaultRestClient(string baseUrl)
+        {
+            _baseUrl = baseUrl;
+
+            _client = new HttpClient(new HttpClientHandler
+            {
+                AutomaticDecompression = DecompressionMethods.GZip | DecompressionMethods.Deflate,
+                UseCookies = false,
+                UseProxy = false
+            });
+            SetHeader("accept-encoding", "gzip, deflate");
+
+            _cancelToken = CancellationToken.None;
+            _errorDeserializer = new JsonSerializer();
+            _rand = new Random();
+        }
+        private void Dispose(bool disposing)
+        {
+            if (!_isDisposed)
+            {
+                if (disposing)
+                    _client.Dispose();
+                _isDisposed = true;
+            }
+        }
+        public void Dispose()
+        {
+            Dispose(true);
+        }
+
+        public void SetHeader(string key, string value)
+        {
+            _client.DefaultRequestHeaders.Remove(key);
+            if (value != null)
+                _client.DefaultRequestHeaders.Add(key, value);
+        }
+        public void SetCancelToken(CancellationToken cancelToken)
+        {
+            _cancelToken = cancelToken;
+        }
+
+        public async Task<RestResponse> SendAsync(string method, string endpoint, CancellationToken cancelToken, bool headerOnly)
+        {
+            string uri = Path.Combine(_baseUrl, endpoint);
+            using (var restRequest = new HttpRequestMessage(GetMethod(method), uri))
+                return await SendInternalAsync(restRequest, cancelToken, headerOnly).ConfigureAwait(false);
+        }
+        public async Task<RestResponse> SendAsync(string method, string endpoint, string json, CancellationToken cancelToken, bool headerOnly)
+        {
+            string uri = Path.Combine(_baseUrl, endpoint);
+            using (var restRequest = new HttpRequestMessage(GetMethod(method), uri))
+            {
+                restRequest.Content = new StringContent(json, Encoding.UTF8, "application/json");
+                return await SendInternalAsync(restRequest, cancelToken, headerOnly).ConfigureAwait(false);
+            }
+        }
+        public async Task<RestResponse> SendAsync(string method, string endpoint, IReadOnlyDictionary<string, object> multipartParams, CancellationToken cancelToken, bool headerOnly)
+        {
+            string uri = Path.Combine(_baseUrl, endpoint);
+            using (var restRequest = new HttpRequestMessage(GetMethod(method), uri))
+            {
+                var content = new MultipartFormDataContent("Upload----" + DateTime.Now.ToString(CultureInfo.InvariantCulture));
+                if (multipartParams != null)
+                {
+                    foreach (var p in multipartParams)
+                    {
+                        switch (p.Value)
+                        {
+                            case string stringValue: { content.Add(new StringContent(stringValue), p.Key); continue; }
+                            case byte[] byteArrayValue: { content.Add(new ByteArrayContent(byteArrayValue), p.Key); continue; }
+                            case Stream streamValue: { content.Add(new StreamContent(streamValue), p.Key); continue; }
+                            case MultipartFile fileValue:
+                            {
+                                var stream = fileValue.Stream;
+                                if (!stream.CanSeek)
+                                {
+                                    var memoryStream = new MemoryStream();
+                                    await stream.CopyToAsync(memoryStream).ConfigureAwait(false);
+                                    memoryStream.Position = 0;
+                                    stream = memoryStream;
+                                }
+                                content.Add(new StreamContent(stream), p.Key, fileValue.Filename);
+                                continue;
+                            }
+                            default: throw new InvalidOperationException($"Unsupported param type \"{p.Value.GetType().Name}\"");
+                        }
+                    }
+                }
+                restRequest.Content = content;
+                return await SendInternalAsync(restRequest, cancelToken, headerOnly).ConfigureAwait(false);
+            }
+        }
+
+        private async Task<RestResponse> SendInternalAsync(HttpRequestMessage request, CancellationToken cancelToken, bool headerOnly)
+        {
+            if (!UnstableCheck())
+                return;
+                
+            cancelToken = CancellationTokenSource.CreateLinkedTokenSource(_cancelToken, cancelToken).Token;
+            HttpResponseMessage response = await _client.SendAsync(request, cancelToken).ConfigureAwait(false);
+            
+            var headers = response.Headers.ToDictionary(x => x.Key, x => x.Value.FirstOrDefault(), StringComparer.OrdinalIgnoreCase);
+            var stream = !headerOnly ? await response.Content.ReadAsStreamAsync().ConfigureAwait(false) : null;
+
+            return new RestResponse(response.StatusCode, headers, stream);
+        }
+
+        private static readonly HttpMethod _patch = new HttpMethod("PATCH");
+        private HttpMethod GetMethod(string method)
+        {
+            switch (method)
+            {
+                case "DELETE": return HttpMethod.Delete;
+                case "GET": return HttpMethod.Get;
+                case "PATCH": return _patch;
+                case "POST": return HttpMethod.Post;
+                case "PUT": return HttpMethod.Put;
+                default: throw new ArgumentOutOfRangeException(nameof(method), $"Unknown HttpMethod: {method}");
+            }
+        }
+
+        private bool UnstableCheck()
+        {
+            return _rand.NextDouble() > FailureRate;
+        }
+    }
+}

src/Discord.Net.DebugTools/UnstableRestClientProvider.cs

@@ -0,0 +1,9 @@
+using Discord.Net.Rest;
+
+namespace Discord.Net.Providers.UnstableUdpSocket
+{
+    public static class UnstableRestClientProvider
+    {
+        public static readonly RestCientProvider Instance = () => new UnstableRestClientProvider();
+    }
+}