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Diffstat (limited to 'src/csharp/Grpc.Core/Server.cs')
| -rw-r--r-- | src/csharp/Grpc.Core/Server.cs | 213 |
1 files changed, 213 insertions, 0 deletions
diff --git a/src/csharp/Grpc.Core/Server.cs b/src/csharp/Grpc.Core/Server.cs new file mode 100644 index 0000000000..002592a3d8 --- /dev/null +++ b/src/csharp/Grpc.Core/Server.cs @@ -0,0 +1,213 @@ +#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.Collections.Concurrent; +using System.Collections.Generic; +using System.Diagnostics; +using System.Runtime.InteropServices; +using System.Threading.Tasks; +using Grpc.Core.Internal; + +namespace Grpc.Core +{ + /// <summary> + /// Server is implemented only to be able to do + /// in-process testing. + /// </summary> + public class Server + { + // TODO: make sure the delegate doesn't get garbage collected while + // native callbacks are in the completion queue. + readonly ServerShutdownCallbackDelegate serverShutdownHandler; + readonly CompletionCallbackDelegate newServerRpcHandler; + + readonly BlockingCollection<NewRpcInfo> newRpcQueue = new BlockingCollection<NewRpcInfo>(); + readonly ServerSafeHandle handle; + + readonly Dictionary<string, IServerCallHandler> callHandlers = new Dictionary<string, IServerCallHandler>(); + + readonly TaskCompletionSource<object> shutdownTcs = new TaskCompletionSource<object>(); + + public Server() + { + this.handle = ServerSafeHandle.NewServer(GetCompletionQueue(), IntPtr.Zero); + this.newServerRpcHandler = HandleNewServerRpc; + this.serverShutdownHandler = HandleServerShutdown; + } + + // only call this before Start() + public void AddServiceDefinition(ServerServiceDefinition serviceDefinition) { + foreach(var entry in serviceDefinition.CallHandlers) + { + callHandlers.Add(entry.Key, entry.Value); + } + } + + // only call before Start() + public int AddPort(string addr) { + return handle.AddPort(addr); + } + + public void Start() + { + handle.Start(); + + // TODO: this basically means the server is single threaded.... + StartHandlingRpcs(); + } + + /// <summary> + /// Requests and handles single RPC call. + /// </summary> + internal void RunRpc() + { + AllowOneRpc(); + + try + { + var rpcInfo = newRpcQueue.Take(); + + //Console.WriteLine("Server received RPC " + rpcInfo.Method); + + IServerCallHandler callHandler; + if (!callHandlers.TryGetValue(rpcInfo.Method, out callHandler)) + { + callHandler = new NoSuchMethodCallHandler(); + } + callHandler.StartCall(rpcInfo.Method, rpcInfo.Call, GetCompletionQueue()); + } + catch(Exception e) + { + Console.WriteLine("Exception while handling RPC: " + e); + } + } + + /// <summary> + /// Requests server shutdown and when there are no more calls being serviced, + /// cleans up used resources. + /// </summary> + /// <returns>The async.</returns> + public async Task ShutdownAsync() { + handle.ShutdownAndNotify(serverShutdownHandler); + await shutdownTcs.Task; + handle.Dispose(); + } + + public void Kill() { + handle.Dispose(); + } + + private async Task StartHandlingRpcs() { + while (true) + { + await Task.Factory.StartNew(RunRpc); + } + } + + private void AllowOneRpc() + { + AssertCallOk(handle.RequestCall(GetCompletionQueue(), newServerRpcHandler)); + } + + private void HandleNewServerRpc(GRPCOpError error, IntPtr batchContextPtr) { + try { + var ctx = new BatchContextSafeHandleNotOwned(batchContextPtr); + + if (error != GRPCOpError.GRPC_OP_OK) { + // TODO: handle error + } + + var rpcInfo = new NewRpcInfo(ctx.GetServerRpcNewCall(), ctx.GetServerRpcNewMethod()); + + // after server shutdown, the callback returns with null call + if (!rpcInfo.Call.IsInvalid) { + newRpcQueue.Add(rpcInfo); + } + + } catch(Exception e) { + Console.WriteLine("Caught exception in a native handler: " + e); + } + } + + private void HandleServerShutdown(IntPtr eventPtr) + { + try + { + shutdownTcs.SetResult(null); + } + catch (Exception e) + { + Console.WriteLine("Caught exception in a native handler: " + e); + } + } + + private static void AssertCallOk(GRPCCallError callError) + { + Trace.Assert(callError == GRPCCallError.GRPC_CALL_OK, "Status not GRPC_CALL_OK"); + } + + private static CompletionQueueSafeHandle GetCompletionQueue() + { + return GrpcEnvironment.ThreadPool.CompletionQueue; + } + + private struct NewRpcInfo + { + private CallSafeHandle call; + private string method; + + public NewRpcInfo(CallSafeHandle call, string method) + { + this.call = call; + this.method = method; + } + + public CallSafeHandle Call + { + get + { + return this.call; + } + } + + public string Method + { + get + { + return this.method; + } + } + } + } +} |