allow configuration of dedicated websocket endpoint

Author: rose-a

src/GraphQL.Client/GraphQLHttpClient.cs

@@ -64,8 +64,8 @@ public GraphQLHttpClient(GraphQLHttpClientOptions options, IGraphQLWebsocketJson
 
             if (!HttpClient.DefaultRequestHeaders.UserAgent.Any())
                 HttpClient.DefaultRequestHeaders.UserAgent.Add(new ProductInfoHeaderValue(GetType().Assembly.GetName().Name, GetType().Assembly.GetName().Version.ToString()));
-
-            _lazyHttpWebSocket = new Lazy<GraphQLHttpWebSocket>(() => new GraphQLHttpWebSocket(Options.EndPoint.GetWebSocketUri(), this));
+            
+            _lazyHttpWebSocket = new Lazy<GraphQLHttpWebSocket>(CreateGraphQLHttpWebSocket);
         }
 
         #endregion
@@ -75,7 +75,9 @@ public GraphQLHttpClient(GraphQLHttpClientOptions options, IGraphQLWebsocketJson
         /// <inheritdoc />
         public async Task<GraphQLResponse<TResponse>> SendQueryAsync<TResponse>(GraphQLRequest request, CancellationToken cancellationToken = default)
         {
-            if (Options.UseWebSocketForQueriesAndMutations || Options.EndPoint.HasWebSocketScheme())
+            if (Options.UseWebSocketForQueriesAndMutations ||
+                !(Options.WebSocketEndPoint is null) && Options.EndPoint is null ||
+                Options.EndPoint.HasWebSocketScheme())
                 return await _graphQlHttpWebSocket.SendRequest<TResponse>(request, cancellationToken);
 
             return await SendHttpRequestAsync<TResponse>(request, cancellationToken);
@@ -152,6 +154,19 @@ private async Task<GraphQLHttpResponse<TResponse>> SendHttpRequestAsync<TRespons
 
             throw new GraphQLHttpRequestException(httpResponseMessage.StatusCode, httpResponseMessage.Headers, content);
         }
+
+        private GraphQLHttpWebSocket CreateGraphQLHttpWebSocket()
+        {
+            if(Options.WebSocketEndPoint is null && Options.EndPoint is null)
+                throw new InvalidOperationException("no endpoint configured");
+
+            var webSocketEndpoint = Options.WebSocketEndPoint ?? Options.EndPoint.GetWebSocketUri();
+            if (!webSocketEndpoint.HasWebSocketScheme())
+                throw new InvalidOperationException($"uri \"{webSocketEndpoint}\" is not a websocket endpoint");
+
+            return new GraphQLHttpWebSocket(webSocketEndpoint, this);
+        }
+
         #endregion
 
         #region IDisposable

src/GraphQL.Client/GraphQLHttpClientOptions.cs

@@ -14,7 +14,12 @@ public class GraphQLHttpClientOptions
         /// <summary>
         /// The GraphQL EndPoint to be used
         /// </summary>
-        public Uri EndPoint { get; set; }
+        public Uri? EndPoint { get; set; }
+
+        /// <summary>
+        /// The GraphQL EndPoint to be used for websocket connections
+        /// </summary>
+        public Uri? WebSocketEndPoint { get; set; } = null;
 
         /// <summary>
         /// The <see cref="System.Net.Http.HttpMessageHandler"/> that is going to be used

src/GraphQL.Client/UriExtensions.cs

@@ -1,4 +1,4 @@
-using System;
+using System;
 
 namespace GraphQL.Client.Http
 {
@@ -9,7 +9,9 @@ public static class UriExtensions
         /// </summary>
         /// <param name="uri"></param>
         /// <returns></returns>
-        public static bool HasWebSocketScheme(this Uri uri) => uri.Scheme.Equals("wss", StringComparison.OrdinalIgnoreCase) || uri.Scheme.Equals("ws", StringComparison.OrdinalIgnoreCase);
+        public static bool HasWebSocketScheme(this Uri? uri) =>
+            !(uri is null) &&
+            (uri.Scheme.Equals("wss", StringComparison.OrdinalIgnoreCase) || uri.Scheme.Equals("ws", StringComparison.OrdinalIgnoreCase));
 
         /// <summary>
         /// Infers the websocket uri from <paramref name="uri"/>.
@@ -18,6 +20,9 @@ public static class UriExtensions
         /// <returns></returns>
         public static Uri GetWebSocketUri(this Uri uri)
         {
+            if (uri is null)
+                throw new ArgumentNullException(nameof(uri));
+
             if (uri.HasWebSocketScheme())
                 return uri;
 

tests/GraphQL.Integration.Tests/WebsocketTests/Base.cs

@@ -79,6 +79,30 @@ public async void CanUseWebSocketScheme()
             var response = await ChatClient.AddMessageAsync(message);
             response.Data.AddMessage.Content.Should().Be(message);
         }
+        
+        [Fact]
+        public async void CanUseDedicatedWebSocketEndpoint()
+        {
+            ChatClient.Options.WebSocketEndPoint = ChatClient.Options.EndPoint.GetWebSocketUri();
+            ChatClient.Options.EndPoint = new Uri("http://bad-endpoint.test");
+            ChatClient.Options.UseWebSocketForQueriesAndMutations = true;
+            await ChatClient.InitializeWebsocketConnection();
+            const string message = "some random testing message";
+            var response = await ChatClient.AddMessageAsync(message);
+            response.Data.AddMessage.Content.Should().Be(message);
+        }
+        
+        [Fact]
+        public async void CanUseDedicatedWebSocketEndpointWithoutHttpEndpoint()
+        {
+            ChatClient.Options.WebSocketEndPoint = ChatClient.Options.EndPoint.GetWebSocketUri();
+            ChatClient.Options.EndPoint = null;
+            ChatClient.Options.UseWebSocketForQueriesAndMutations = false;
+            await ChatClient.InitializeWebsocketConnection();
+            const string message = "some random testing message";
+            var response = await ChatClient.AddMessageAsync(message);
+            response.Data.AddMessage.Content.Should().Be(message);
+        }
 
         [Fact]
         public async void WebsocketRequestCanBeCancelled()