Initial checkin of gRPC to third_party/

third_party/grpc/src/csharp/Grpc.IntegrationTesting/ClientRunners.cs

Index: third_party/grpc/src/csharp/Grpc.IntegrationTesting/ClientRunners.cs
diff --git a/third_party/grpc/src/csharp/Grpc.IntegrationTesting/ClientRunners.cs b/third_party/grpc/src/csharp/Grpc.IntegrationTesting/ClientRunners.cs
new file mode 100644
index 0000000000000000000000000000000000000000..c4016012cbb63face4aeb366578e1f4f4f46c3b3
--- /dev/null
+++ b/third_party/grpc/src/csharp/Grpc.IntegrationTesting/ClientRunners.cs
@@ -0,0 +1,153 @@
+#region Copyright notice and license
+
+// Copyright 2015-2016, 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.Collections.Generic;
+using System.Diagnostics;
+using System.IO;
+using System.Linq;
+using System.Text.RegularExpressions;
+using System.Threading;
+using System.Threading.Tasks;
+using Google.Protobuf;
+using Grpc.Core;
+using Grpc.Core.Utils;
+using NUnit.Framework;
+using Grpc.Testing;
+
+namespace Grpc.IntegrationTesting
+{
+    /// <summary>
+    /// Helper methods to start client runners for performance testing.
+    /// </summary>
+    public static class ClientRunners
+    {
+        /// <summary>
+        /// Creates a started client runner.
+        /// </summary>
+        public static IClientRunner CreateStarted(ClientConfig config)
+        {
+            string target = config.ServerTargets.Single();
+            GrpcPreconditions.CheckArgument(config.LoadParams.LoadCase == LoadParams.LoadOneofCase.ClosedLoop);
+
+            var credentials = config.SecurityParams != null ? TestCredentials.CreateSslCredentials() : ChannelCredentials.Insecure;
+            var channel = new Channel(target, credentials);
+
+            switch (config.RpcType)
+            {
+                case RpcType.UNARY:
+                    return new SyncUnaryClientRunner(channel,
+                        config.PayloadConfig.SimpleParams.ReqSize,
+                        config.HistogramParams);
+
+                case RpcType.STREAMING:
+                default:
+                    throw new ArgumentException("Unsupported RpcType.");
+            }
+        }
+    }
+
+    /// <summary>
+    /// Client that starts synchronous unary calls in a closed loop.
+    /// </summary>
+    public class SyncUnaryClientRunner : IClientRunner
+    {
+        const double SecondsToNanos = 1e9;
+
+        readonly Channel channel;
+        readonly int payloadSize;
+        readonly Histogram histogram;
+
+        readonly BenchmarkService.IBenchmarkServiceClient client;
+        readonly Task runnerTask;
+        readonly CancellationTokenSource stoppedCts;
+        readonly WallClockStopwatch wallClockStopwatch = new WallClockStopwatch();
+        
+        public SyncUnaryClientRunner(Channel channel, int payloadSize, HistogramParams histogramParams)
+        {
+            this.channel = GrpcPreconditions.CheckNotNull(channel);
+            this.payloadSize = payloadSize;
+            this.histogram = new Histogram(histogramParams.Resolution, histogramParams.MaxPossible);
+
+            this.stoppedCts = new CancellationTokenSource();
+            this.client = BenchmarkService.NewClient(channel);
+            this.runnerTask = Task.Factory.StartNew(Run, TaskCreationOptions.LongRunning);
+        }
+
+        public ClientStats GetStats(bool reset)
+        {
+            var histogramData = histogram.GetSnapshot(reset);
+            var secondsElapsed = wallClockStopwatch.GetElapsedSnapshot(reset).TotalSeconds;
+
+            // TODO: populate user time and system time
+            return new ClientStats
+            {
+                Latencies = histogramData,
+                TimeElapsed = secondsElapsed,
+                TimeUser = 0,
+                TimeSystem = 0
+            };
+        }
+
+        public async Task StopAsync()
+        {
+            stoppedCts.Cancel();
+            await runnerTask;
+            await channel.ShutdownAsync();
+        }
+
+        private void Run()
+        {
+            var request = new SimpleRequest
+            {
+                Payload = CreateZerosPayload(payloadSize)
+            };
+            var stopwatch = new Stopwatch();
+
+            while (!stoppedCts.Token.IsCancellationRequested)
+            {
+                stopwatch.Restart();
+                client.UnaryCall(request);
+                stopwatch.Stop();
+
+                // spec requires data point in nanoseconds.
+                histogram.AddObservation(stopwatch.Elapsed.TotalSeconds * SecondsToNanos);
+            }
+        }
+
+        private static Payload CreateZerosPayload(int size)
+        {
+            return new Payload { Body = ByteString.CopyFrom(new byte[size]) };
+        }
+    }
+}