Adding timeout and retries

src/GitHubActions.Teams.ConsoleApp/Program.cs

@@ -15,6 +15,13 @@ namespace Aliencube.GitHubActions.Teams.ConsoleApp
     /// </summary>
     public static class Program
     {
+        static Program() {
+            HttpClient = new HttpClient(new RetryHandler(new HttpClientHandler()))
+            {
+                Timeout = TimeSpan.FromSeconds(100) // Default one, just to be easier to customize
+            };
+        }
+
         /// <summary>
         /// Gets or sets the <see cref="IMessageHandler"/> instance.
         /// </summary>
@@ -23,7 +30,7 @@ public static class Program
         /// <summary>
         /// Gets or sets the <see cref="HttpClient"/> instance.
         /// </summary>
-        public static HttpClient HttpClient { get; set; } = new HttpClient();
+        public static HttpClient HttpClient { get; set; }
 
         private static JsonSerializerSettings settings { get; } =
             new JsonSerializerSettings()

src/GitHubActions.Teams.ConsoleApp/RetryHandler.cs

@@ -0,0 +1,42 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Net.Http;
+using System.Threading;
+using System.Threading.Tasks;
+using CommandLine;
+
+using Newtonsoft.Json;
+using Newtonsoft.Json.Serialization;
+
+namespace Aliencube.GitHubActions.Teams.ConsoleApp
+{
+    public class RetryHandler : DelegatingHandler
+    {
+        // Strongly consider limiting the number of retries - "retry forever" is
+        // probably not the most user friendly way you could respond to "the
+        // network cable got pulled out."
+        private const int MaxRetries = 3;
+
+        public RetryHandler(HttpMessageHandler innerHandler)
+            : base(innerHandler)
+        { }
+
+        protected override async Task<HttpResponseMessage> SendAsync(
+            HttpRequestMessage request,
+            CancellationToken cancellationToken)
+        {
+            HttpResponseMessage response = null;
+            for (int i = 0; i < MaxRetries; i++)
+            {
+                response = await base.SendAsync(request, cancellationToken);
+                if (response.IsSuccessStatusCode)
+                {
+                    return response;
+                }
+            }
+
+            return response;
+        }
+    }
+}