Initial checkin of gRPC to third_party/

third_party/grpc/src/csharp/Grpc.Core.Tests/ContextPropagationTest.cs

+#region Copyright notice and license
+
+// Copyright 2015, Google Inc.
+// All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+#endregion
+
+using System;
+using System.Diagnostics;
+using System.Linq;
+using System.Threading;
+using System.Threading.Tasks;
+using Grpc.Core;
+using Grpc.Core.Internal;
+using Grpc.Core.Utils;
+using NUnit.Framework;
+
+namespace Grpc.Core.Tests
+{
+    public class ContextPropagationTest
+    {
+        MockServiceHelper helper;
+        Server server;
+        Channel channel;
+
+        [SetUp]
+        public void Init()
+        {
+            helper = new MockServiceHelper();
+
+            server = helper.GetServer();
+            server.Start();
+            channel = helper.GetChannel();
+        }
+
+        [TearDown]
+        public void Cleanup()
+        {
+            channel.ShutdownAsync().Wait();
+            server.ShutdownAsync().Wait();
+        }
+
+        [Test]
+        public async Task PropagateCancellation()
+        {
+            var readyToCancelTcs = new TaskCompletionSource<object>();
+            var successTcs = new TaskCompletionSource<string>();
+
+            helper.UnaryHandler = new UnaryServerMethod<string, string>(async (request, context) =>
+            {
+                readyToCancelTcs.SetResult(null);  // child call running, ready to parent call
+
+                while (!context.CancellationToken.IsCancellationRequested)
+                {
+                    await Task.Delay(10);
+                }
+                successTcs.SetResult("CHILD_CALL_CANCELLED");
+                return "";
+            });
+
+            helper.ClientStreamingHandler = new ClientStreamingServerMethod<string, string>(async (requestStream, context) =>
+            {
+                var propagationToken = context.CreatePropagationToken();
+                Assert.IsNotNull(propagationToken.ParentCall);
+
+                var callOptions = new CallOptions(propagationToken: propagationToken);
+                try
+                {
+                    await Calls.AsyncUnaryCall(helper.CreateUnaryCall(callOptions), "xyz");
+                }
+                catch(RpcException)
+                {
+                    // Child call will get cancelled, eat the exception.
+                }
+                return "";
+            });
+                
+            var cts = new CancellationTokenSource();
+            var parentCall = Calls.AsyncClientStreamingCall(helper.CreateClientStreamingCall(new CallOptions(cancellationToken: cts.Token)));
+            await readyToCancelTcs.Task;
+            cts.Cancel();
+            Assert.Throws(typeof(RpcException), async () => await parentCall);
+            Assert.AreEqual("CHILD_CALL_CANCELLED", await successTcs.Task);
+        }
+
+        [Test]
+        public async Task PropagateDeadline()
+        {
+            var deadline = DateTime.UtcNow.AddDays(7);
+            helper.UnaryHandler = new UnaryServerMethod<string, string>(async (request, context) =>
+            {
+                Assert.IsTrue(context.Deadline < deadline.AddMinutes(1));
+                Assert.IsTrue(context.Deadline > deadline.AddMinutes(-1));
+                return "PASS";
+            });
+
+            helper.ClientStreamingHandler = new ClientStreamingServerMethod<string, string>(async (requestStream, context) =>
+            {
+                Assert.Throws(typeof(ArgumentException), () =>
+                {
+                    // Trying to override deadline while propagating deadline from parent call will throw.
+                    Calls.BlockingUnaryCall(helper.CreateUnaryCall(
+                        new CallOptions(deadline: DateTime.UtcNow.AddDays(8),
+                                        propagationToken: context.CreatePropagationToken())), "");
+                });
+
+                var callOptions = new CallOptions(propagationToken: context.CreatePropagationToken());
+                return await Calls.AsyncUnaryCall(helper.CreateUnaryCall(callOptions), "xyz");
+            });
+                
+            var call = Calls.AsyncClientStreamingCall(helper.CreateClientStreamingCall(new CallOptions(deadline: deadline)));
+            await call.RequestStream.CompleteAsync();
+            Assert.AreEqual("PASS", await call);
+        }
+
+        [Test]
+        public async Task SuppressDeadlinePropagation()
+        {
+            helper.UnaryHandler = new UnaryServerMethod<string, string>(async (request, context) =>
+            {
+                Assert.AreEqual(DateTime.MaxValue, context.Deadline);
+                return "PASS";
+            });
+
+            helper.ClientStreamingHandler = new ClientStreamingServerMethod<string, string>(async (requestStream, context) =>
+            {
+                Assert.IsTrue(context.CancellationToken.CanBeCanceled);
+
+                var callOptions = new CallOptions(propagationToken: context.CreatePropagationToken(new ContextPropagationOptions(propagateDeadline: false)));
+                return await Calls.AsyncUnaryCall(helper.CreateUnaryCall(callOptions), "xyz");
+            });
+
+            var cts = new CancellationTokenSource();
+            var call = Calls.AsyncClientStreamingCall(helper.CreateClientStreamingCall(new CallOptions(deadline: DateTime.UtcNow.AddDays(7))));
+            await call.RequestStream.CompleteAsync();
+            Assert.AreEqual("PASS", await call);
+        }
+    }
+}