[#28] Client: Use external GRPC Channnel

Signed-off-by: Pavel Gross <p.gross@yadro.com>

src/FrostFS.SDK.Client/ObjectWriter.cs

@@ -0,0 +1,68 @@
+using System;
+using System.Threading.Tasks;
+
+using FrostFS.Object;
+using FrostFS.SDK.Client.Interfaces;
+
+using Google.Protobuf;
+
+namespace FrostFS.SDK.Client
+{
+    internal sealed class ObjectWriter : IObjectWriter
+    {
+        private readonly ClientContext ctx;
+        private readonly PrmObjectPutBase args;
+        private readonly ObjectStreamer<PutRequest, PutResponse> streamer;
+        private bool disposedValue;
+
+        internal ObjectWriter(ClientContext ctx, PrmObjectPutBase args, ObjectStreamer<PutRequest, PutResponse> streamer)
+        {
+            this.ctx = ctx;
+            this.args = args;
+            this.streamer = streamer;
+        }
+
+        public async Task WriteAsync(ReadOnlyMemory<byte> memory)
+        {
+            var chunkRequest = new PutRequest
+            {
+                Body = new PutRequest.Types.Body
+                {
+                    Chunk = UnsafeByteOperations.UnsafeWrap(memory)
+                }
+            };
+
+            chunkRequest.Sign(this.ctx.Key.ECDsaKey);
+
+            await streamer.Write(chunkRequest).ConfigureAwait(false);
+        }
+
+        public async Task<FrostFsObjectId> CompleteAsync()
+        {
+            var response = await streamer.Close().ConfigureAwait(false);
+
+            Verifier.CheckResponse(response);
+
+            return FrostFsObjectId.FromHash(response.Body.ObjectId.Value.Span);
+        }
+
+        private void Dispose(bool disposing)
+        {
+            if (!disposedValue)
+            {
+                if (disposing)
+                {
+                    streamer.Dispose();
+                }
+
+                disposedValue = true;
+            }
+        }
+
+        public void Dispose()
+        {
+            Dispose(disposing: true);
+            GC.SuppressFinalize(this);
+        }
+    }
+}