Initial checkin of gRPC to third_party/

third_party/grpc/src/csharp/Grpc.Core/Internal/CallSafeHandle.cs

+#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.Diagnostics;
+using System.Runtime.InteropServices;
+using Grpc.Core;
+using Grpc.Core.Utils;
+using Grpc.Core.Profiling;
+
+namespace Grpc.Core.Internal
+{
+    /// <summary>
+    /// grpc_call from <c>grpc/grpc.h</c>
+    /// </summary>
+    internal class CallSafeHandle : SafeHandleZeroIsInvalid, INativeCall
+    {
+        public static readonly CallSafeHandle NullInstance = new CallSafeHandle();
+        static readonly NativeMethods Native = NativeMethods.Get();
+
+        const uint GRPC_WRITE_BUFFER_HINT = 1;
+        CompletionRegistry completionRegistry;
+        CompletionQueueSafeHandle completionQueue;
+
+        private CallSafeHandle()
+        {
+        }
+
+        public void Initialize(CompletionRegistry completionRegistry, CompletionQueueSafeHandle completionQueue)
+        {
+            this.completionRegistry = completionRegistry;
+            this.completionQueue = completionQueue;
+        }
+
+        public void SetCredentials(CallCredentialsSafeHandle credentials)
+        {
+            Native.grpcsharp_call_set_credentials(this, credentials).CheckOk();
+        }
+
+        public void StartUnary(UnaryResponseClientHandler callback, byte[] payload, MetadataArraySafeHandle metadataArray, WriteFlags writeFlags)
+        {
+            using (completionQueue.NewScope())
+            {
+                var ctx = BatchContextSafeHandle.Create();
+                completionRegistry.RegisterBatchCompletion(ctx, (success, context) => callback(success, context.GetReceivedStatusOnClient(), context.GetReceivedMessage(), context.GetReceivedInitialMetadata()));
+                Native.grpcsharp_call_start_unary(this, ctx, payload, new UIntPtr((ulong)payload.Length), metadataArray, writeFlags)
+                    .CheckOk();
+            }
+        }
+
+        public void StartUnary(BatchContextSafeHandle ctx, byte[] payload, MetadataArraySafeHandle metadataArray, WriteFlags writeFlags)
+        {
+            using (Profilers.ForCurrentThread().NewScope("CallSafeHandle.StartUnary"))
+            {
+                Native.grpcsharp_call_start_unary(this, ctx, payload, new UIntPtr((ulong)payload.Length), metadataArray, writeFlags)
+                    .CheckOk();
+            }
+        }
+
+        public void StartClientStreaming(UnaryResponseClientHandler callback, MetadataArraySafeHandle metadataArray)
+        {
+            using (completionQueue.NewScope())
+            {
+                var ctx = BatchContextSafeHandle.Create();
+                completionRegistry.RegisterBatchCompletion(ctx, (success, context) => callback(success, context.GetReceivedStatusOnClient(), context.GetReceivedMessage(), context.GetReceivedInitialMetadata()));
+                Native.grpcsharp_call_start_client_streaming(this, ctx, metadataArray).CheckOk();
+            }
+        }
+
+        public void StartServerStreaming(ReceivedStatusOnClientHandler callback, byte[] payload, MetadataArraySafeHandle metadataArray, WriteFlags writeFlags)
+        {
+            using (completionQueue.NewScope())
+            {
+                var ctx = BatchContextSafeHandle.Create();
+                completionRegistry.RegisterBatchCompletion(ctx, (success, context) => callback(success, context.GetReceivedStatusOnClient()));
+                Native.grpcsharp_call_start_server_streaming(this, ctx, payload, new UIntPtr((ulong)payload.Length), metadataArray, writeFlags).CheckOk();
+            }
+        }
+
+        public void StartDuplexStreaming(ReceivedStatusOnClientHandler callback, MetadataArraySafeHandle metadataArray)
+        {
+            using (completionQueue.NewScope())
+            {
+                var ctx = BatchContextSafeHandle.Create();
+                completionRegistry.RegisterBatchCompletion(ctx, (success, context) => callback(success, context.GetReceivedStatusOnClient()));
+                Native.grpcsharp_call_start_duplex_streaming(this, ctx, metadataArray).CheckOk();
+            }
+        }
+
+        public void StartSendMessage(SendCompletionHandler callback, byte[] payload, WriteFlags writeFlags, bool sendEmptyInitialMetadata)
+        {
+            using (completionQueue.NewScope())
+            {
+                var ctx = BatchContextSafeHandle.Create();
+                completionRegistry.RegisterBatchCompletion(ctx, (success, context) => callback(success));
+                Native.grpcsharp_call_send_message(this, ctx, payload, new UIntPtr((ulong)payload.Length), writeFlags, sendEmptyInitialMetadata).CheckOk();
+            }
+        }
+
+        public void StartSendCloseFromClient(SendCompletionHandler callback)
+        {
+            using (completionQueue.NewScope())
+            {
+                var ctx = BatchContextSafeHandle.Create();
+                completionRegistry.RegisterBatchCompletion(ctx, (success, context) => callback(success));
+                Native.grpcsharp_call_send_close_from_client(this, ctx).CheckOk();
+            }
+        }
+
+        public void StartSendStatusFromServer(SendCompletionHandler callback, Status status, MetadataArraySafeHandle metadataArray, bool sendEmptyInitialMetadata)
+        {
+            using (completionQueue.NewScope())
+            {
+                var ctx = BatchContextSafeHandle.Create();
+                completionRegistry.RegisterBatchCompletion(ctx, (success, context) => callback(success));
+                Native.grpcsharp_call_send_status_from_server(this, ctx, status.StatusCode, status.Detail, metadataArray, sendEmptyInitialMetadata).CheckOk();
+            }
+        }
+
+        public void StartReceiveMessage(ReceivedMessageHandler callback)
+        {
+            using (completionQueue.NewScope())
+            {
+                var ctx = BatchContextSafeHandle.Create();
+                completionRegistry.RegisterBatchCompletion(ctx, (success, context) => callback(success, context.GetReceivedMessage()));
+                Native.grpcsharp_call_recv_message(this, ctx).CheckOk();
+            }
+        }
+
+        public void StartReceiveInitialMetadata(ReceivedResponseHeadersHandler callback)
+        {
+            using (completionQueue.NewScope())
+            {
+                var ctx = BatchContextSafeHandle.Create();
+                completionRegistry.RegisterBatchCompletion(ctx, (success, context) => callback(success, context.GetReceivedInitialMetadata()));
+                Native.grpcsharp_call_recv_initial_metadata(this, ctx).CheckOk();
+            }
+        }
+
+        public void StartServerSide(ReceivedCloseOnServerHandler callback)
+        {
+            using (completionQueue.NewScope())
+            {
+                var ctx = BatchContextSafeHandle.Create();
+                completionRegistry.RegisterBatchCompletion(ctx, (success, context) => callback(success, context.GetReceivedCloseOnServerCancelled()));
+                Native.grpcsharp_call_start_serverside(this, ctx).CheckOk();
+            }
+        }
+
+        public void StartSendInitialMetadata(SendCompletionHandler callback, MetadataArraySafeHandle metadataArray)
+        {
+            using (completionQueue.NewScope())
+            {
+                var ctx = BatchContextSafeHandle.Create();
+                completionRegistry.RegisterBatchCompletion(ctx, (success, context) => callback(success));
+                Native.grpcsharp_call_send_initial_metadata(this, ctx, metadataArray).CheckOk();
+            }
+        }
+
+        public void Cancel()
+        {
+            Native.grpcsharp_call_cancel(this).CheckOk();
+        }
+
+        public void CancelWithStatus(Status status)
+        {
+            Native.grpcsharp_call_cancel_with_status(this, status.StatusCode, status.Detail).CheckOk();
+        }
+
+        public string GetPeer()
+        {
+            using (var cstring = Native.grpcsharp_call_get_peer(this))
+            {
+                return cstring.GetValue();
+            }
+        }
+
+        protected override bool ReleaseHandle()
+        {
+            Native.grpcsharp_call_destroy(handle);
+            return true;
+        }
+
+        private static uint GetFlags(bool buffered)
+        {
+            return buffered ? 0 : GRPC_WRITE_BUFFER_HINT;
+        }
+    }
+}