Replace default delivery with HttpClient implementation

src/Bugsnag/Bugsnag.csproj

@@ -11,12 +11,12 @@
     <Reference Include="System.Runtime.Serialization" />
     <Reference Include="System.Xml" />
     <Reference Include="System.Xml.Linq" />
+    <Reference Include="System.Net.Http" />
   </ItemGroup>
   <ItemGroup Condition="'$(TargetFramework)' == 'netstandard2.0'">
     <PackageReference Include="System.Collections.Specialized" Version="4.3.0" />
     <PackageReference Include="System.Diagnostics.TraceSource" Version="4.3.0" />
     <PackageReference Include="System.Diagnostics.StackTrace" Version="4.3.0" />
-    <PackageReference Include="System.Net.Requests" Version="4.3.0" />
     <PackageReference Include="System.Runtime.Serialization.Primitives" Version="4.3.0" />
     <PackageReference Include="System.Threading.Thread" Version="4.3.0" />
   </ItemGroup>

src/Bugsnag/Client.cs

@@ -47,9 +47,9 @@ public Client(string apiKey) : this(new Configuration(apiKey))
     /// Constructs a client with the default storage and delivery classes.
     /// </summary>
     /// <param name="configuration"></param>
-    public Client(IConfiguration configuration) : this(configuration, ThreadQueueDelivery.Instance, new Breadcrumbs(configuration), new SessionTracker(configuration))
+    public Client(IConfiguration configuration) : this(configuration, DefaultDelivery.Instance, new Breadcrumbs(configuration), new SessionTracker(configuration))
     {
-
+      DefaultDelivery.Instance.Configure(configuration);
     }
 
     /// <summary>

src/Bugsnag/DefaultDelivery.cs

@@ -0,0 +1,135 @@
+using Bugsnag.Payload;
+using System;
+using System.Collections.Concurrent;
+using System.Collections.Generic;
+using System.Diagnostics;
+using System.Net;
+using System.Net.Http;
+using System.Net.Http.Headers;
+using System.Text;
+using System.Threading;
+using System.Threading.Tasks;
+
+namespace Bugsnag
+{
+  public class DefaultDelivery : IDelivery
+  {
+    private static DefaultDelivery instance = null;
+    private static readonly object instanceLock = new object();
+
+    private HttpClient _httpClient;
+    private readonly CancellationTokenSource _cancellationTokenSource;
+    private readonly Task _processingTask;
+    private readonly BlockingCollection<IPayload> _queue;
+
+    private DefaultDelivery()
+    {
+      _httpClient = new HttpClient();
+      _queue = new BlockingCollection<IPayload>(new ConcurrentQueue<IPayload>());
+      _cancellationTokenSource = new CancellationTokenSource();
+      _processingTask = Task.Run(() => ProcessQueueAsync(_cancellationTokenSource.Token));
+    }
+
+    public static DefaultDelivery Instance
+    {
+      get
+      {
+        lock (instanceLock)
+        {
+          if (instance == null)
+          {
+            instance = new DefaultDelivery();
+          }
+
+          return instance;
+        }
+      }
+    }
+
+    public void Configure(IConfiguration configuration)
+    {
+      if (configuration.Proxy != null)
+      {
+        _httpClient.Dispose();
+        _httpClient = new HttpClient(new HttpClientHandler { Proxy = configuration.Proxy });
+      }
+    }
+
+    public void Send(IPayload payload)
+    {
+      _queue.Add(payload);
+    }
+
+    internal void Stop()
+    {
+      Task.WaitAll(new[] { _processingTask }, TimeSpan.FromSeconds(5));
+      _cancellationTokenSource.Cancel();
+      _httpClient.Dispose();
+      _cancellationTokenSource.Dispose();
+      _queue.Dispose();
+    }
+
+    private async Task ProcessQueueAsync(CancellationToken cancellationToken)
+    {
+      while (!cancellationToken.IsCancellationRequested)
+      {
+        IPayload payload = null;
+
+        try
+        {
+          // Take will block until an item is available or cancellation is requested
+          payload = _queue.Take(cancellationToken);
+        }
+        catch (OperationCanceledException)
+        {
+          // Exit gracefully when cancellation is requested
+          break;
+        }
+
+        if (payload != null)
+        {
+          await SendPayloadAsync(payload);
+        }
+      }
+    }
+
+    private async Task SendPayloadAsync(IPayload payload)
+    {
+      try
+      {
+        byte[] serializedPayload = payload.Serialize();
+        if (serializedPayload == null)
+          return;
+
+        using (var request = new HttpRequestMessage(HttpMethod.Post, payload.Endpoint))
+        {
+          request.Content = new ByteArrayContent(serializedPayload);
+          request.Content.Headers.ContentType = new MediaTypeHeaderValue("application/json");
+
+          // Add headers from payload
+          if (payload.Headers != null)
+          {
+            foreach (var header in payload.Headers)
+            {
+              request.Headers.TryAddWithoutValidation(header.Key, header.Value);
+            }
+          }
+
+          // Add the Bugsnag-Sent-At header
+          request.Headers.Add("Bugsnag-Sent-At", DateTime.UtcNow.ToString("o", System.Globalization.CultureInfo.InvariantCulture));
+
+          // Send the request and log any failures
+          var response = await _httpClient.SendAsync(request);
+
+          if (!response.IsSuccessStatusCode) {
+            Trace.WriteLine($"Failed to send payload to Bugsnag - received status code {response.StatusCode}");
+          }
+        }
+      }
+      catch (System.Exception ex)
+      {
+        Trace.WriteLine($"Error sending payload to Bugsnag: {ex}");
+      }
+    }
+  }
+}

src/Bugsnag/IDelivery.cs

@@ -17,8 +17,6 @@ public interface IPayload
   {
     Uri Endpoint { get; }
 
-    IWebProxy Proxy { get; }
-
     KeyValuePair<string, string>[] Headers { get; }
 
     byte[] Serialize();

src/Bugsnag/Payload/BatchedSessions.cs

@@ -19,11 +19,12 @@ public BatchedSessions(IConfiguration configuration, NotifierInfo notifier, App
     {
       _configuration = configuration;
       Endpoint = configuration.SessionEndpoint;
-      Proxy = configuration.Proxy;
+
       _headers = new KeyValuePair<string, string>[] {
         new KeyValuePair<string, string>(Payload.Headers.ApiKeyHeader, configuration.ApiKey),
         new KeyValuePair<string, string>(Payload.Headers.PayloadVersionHeader, "1.0")
       };
+
       this.AddToPayload("notifier", notifier);
       this.AddToPayload("device", device);
       this.AddToPayload("app", app);
@@ -32,8 +33,6 @@ public BatchedSessions(IConfiguration configuration, NotifierInfo notifier, App
 
     public Uri Endpoint { get; set; }
 
-    public IWebProxy Proxy { get; set; }
-
     public KeyValuePair<string, string>[] Headers => _headers;
 
     public byte[] Serialize()

src/Bugsnag/Payload/Report.cs

@@ -39,7 +39,7 @@ public Report(IConfiguration configuration, System.Exception exception, HandledS
     {
       _ignored = false;
       Endpoint = configuration.Endpoint;
-      Proxy = configuration.Proxy;
+
       _headers = new KeyValuePair<string, string>[] {
         new KeyValuePair<string, string>(Payload.Headers.ApiKeyHeader, configuration.ApiKey),
         new KeyValuePair<string, string>(Payload.Headers.PayloadVersionHeader, _payloadVersion),
@@ -87,8 +87,6 @@ public void Ignore()
     /// </summary>
     public Uri Endpoint { get; set; }
 
-    public IWebProxy Proxy { get; set; }
-
     public KeyValuePair<string, string>[] Headers { get { return _headers; } }
 
     public byte[] Serialize()

src/Bugsnag/SessionsStore.cs

@@ -39,7 +39,7 @@ private void SendSessions(object state)
       foreach (var item in sessionData)
       {
         var payload = new BatchedSessions(item.Key, item.Value);
-        ThreadQueueDelivery.Instance.Send(payload);
+        DefaultDelivery.Instance.Send(payload);
       }
     }