Add support for PATCH in HttpConnection.ConvertHttpMethod

CHANGELOG.md

@@ -10,6 +10,9 @@ Inspired from [Keep a Changelog](https://keepachangelog.com/en/1.0.0/)
 - Removed the `Features` API which is not supported by OpenSearch from the low-level client ([#331](https://github.com/opensearch-project/opensearch-net/pull/331))
 - Removed the deprecated low-level `IndexTemplateV2` APIs in favour of the `ComposableIndexTemplate` APIs ([#437](https://github.com/opensearch-project/opensearch-net/pull/437))
 
+### Fixed
+- Fix `HttpConnection.ConvertHttpMethod` to support `Patch` method ([#489](https://github.com/opensearch-project/opensearch-net/pull/489))
+
 ### Dependencies
 - Bumps `Microsoft.CodeAnalysis.CSharp` from 4.2.0 to 4.6.0
 - Bumps `NSwag.Core.Yaml` from 13.19.0 to 13.20.0
@@ -130,4 +133,4 @@ Inspired from [Keep a Changelog](https://keepachangelog.com/en/1.0.0/)
 [1.6.0]: https://github.com/opensearch-project/opensearch-net/compare/v1.5.0...v1.6.0
 [1.5.0]: https://github.com/opensearch-project/opensearch-net/compare/v1.4.0...v1.5.0
 [1.4.0]: https://github.com/opensearch-project/opensearch-net/compare/v1.3.0...v1.4.0
-[1.3.0]: https://github.com/opensearch-project/opensearch-net/compare/v1.2.0...v1.3.0
+[1.3.0]: https://github.com/opensearch-project/opensearch-net/compare/v1.2.0...v1.3.0

src/OpenSearch.Net/Connection/HttpConnection.cs

@@ -27,7 +27,6 @@
 */
 
 using System;
-using System.Collections.Concurrent;
 using System.Collections.Generic;
 using System.Collections.ObjectModel;
 using System.Diagnostics;
@@ -70,6 +69,8 @@ public class HttpConnection : IConnection
 			+ $" please set {nameof(ConnectionConfiguration.ConnectionLimit)} to -1 on your connection configuration/settings."
 			+ $" this will cause the {nameof(HttpClientHandler.MaxConnectionsPerServer)} not to be set on {nameof(HttpClientHandler)}";
 
+		private static readonly System.Net.Http.HttpMethod Patch = new System.Net.Http.HttpMethod("PATCH");
+
 		private RequestDataHttpClientFactory HttpClientFactory { get; }
 
 		public int InUseHandlers => HttpClientFactory.InUseHandlers;
@@ -430,19 +431,17 @@ private static async Task SetContentAsync(HttpRequestMessage message, RequestDat
 			}
 		}
 
-		private static System.Net.Http.HttpMethod ConvertHttpMethod(HttpMethod httpMethod)
-		{
-			switch (httpMethod)
+		private static System.Net.Http.HttpMethod ConvertHttpMethod(HttpMethod httpMethod) =>
+			httpMethod switch
 			{
-				case HttpMethod.GET: return System.Net.Http.HttpMethod.Get;
-				case HttpMethod.POST: return System.Net.Http.HttpMethod.Post;
-				case HttpMethod.PUT: return System.Net.Http.HttpMethod.Put;
-				case HttpMethod.DELETE: return System.Net.Http.HttpMethod.Delete;
-				case HttpMethod.HEAD: return System.Net.Http.HttpMethod.Head;
-				default:
-					throw new ArgumentException("Invalid value for HttpMethod", nameof(httpMethod));
-			}
-		}
+				HttpMethod.GET => System.Net.Http.HttpMethod.Get,
+				HttpMethod.POST => System.Net.Http.HttpMethod.Post,
+				HttpMethod.PUT => System.Net.Http.HttpMethod.Put,
+				HttpMethod.DELETE => System.Net.Http.HttpMethod.Delete,
+				HttpMethod.HEAD => System.Net.Http.HttpMethod.Head,
+				HttpMethod.PATCH => Patch,
+				_ => throw new ArgumentException("Invalid value for HttpMethod", nameof(httpMethod))
+			};
 
 		internal static int GetClientKey(RequestData requestData)
 		{

tests/Tests/Connection/Http/HttpConnectionTests.cs

@@ -0,0 +1,52 @@
+/* SPDX-License-Identifier: Apache-2.0
+ *
+ * The OpenSearch Contributors require contributions made to
+ * this file be licensed under the Apache-2.0 license or a
+ * compatible open source license.
+ */
+
+using System;
+using System.Net.Http;
+using FluentAssertions;
+using OpenSearch.Net;
+using OpenSearch.OpenSearch.Xunit.XunitPlumbing;
+using Xunit;
+using HttpMethod = OpenSearch.Net.HttpMethod;
+
+namespace Tests.Connection.Http;
+
+public class HttpConnectionTests
+{
+	public static TheoryData<HttpMethod> HttpMethods()
+	{
+		var data = new TheoryData<HttpMethod>();
+		foreach (var httpMethod in Enum.GetValues<HttpMethod>()) data.Add(httpMethod);
+		return data;
+	}
+
+	[TU]
+	[MemberData(nameof(HttpMethods))]
+	public void UsesCorrectHttpMethod(HttpMethod method)
+	{
+		var mockHttpConnection = new MockHttpConnection();
+		mockHttpConnection.Request<StringResponse>(new RequestData(method, "", null, null, null, null));
+		mockHttpConnection.LastRequest.Method.Should().Be(new System.Net.Http.HttpMethod(method.ToString()));
+	}
+
+	private class MockHttpConnection : HttpConnection
+	{
+		public HttpRequestMessage LastRequest { get; private set; }
+
+		protected override HttpRequestMessage CreateHttpRequestMessage(RequestData requestData)
+		{
+			LastRequest = base.CreateHttpRequestMessage(requestData);
+			return LastRequest;
+		}
+
+		public override TResponse Request<TResponse>(RequestData requestData)
+		{
+			CreateHttpRequestMessage(requestData);
+			return new TResponse();
+		}
+	}
+}