| #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; |
| using Grpc.Core.Utils; |
| |
| namespace Grpc.Core |
| { |
| /// <summary> |
| /// A gRPC server. |
| /// </summary> |
| public class Server |
| { |
| /// <summary> |
| /// Pass this value as port to have the server choose an unused listening port for you. |
| /// </summary> |
| public const int PickUnusedPort = 0; |
| |
| // TODO(jtattermusch) : make sure the delegate doesn't get garbage collected while |
| // native callbacks are in the completion queue. |
| readonly ServerShutdownCallbackDelegate serverShutdownHandler; |
| readonly CompletionCallbackDelegate newServerRpcHandler; |
| |
| readonly ServerSafeHandle handle; |
| readonly object myLock = new object(); |
| |
| readonly Dictionary<string, IServerCallHandler> callHandlers = new Dictionary<string, IServerCallHandler>(); |
| readonly TaskCompletionSource<object> shutdownTcs = new TaskCompletionSource<object>(); |
| |
| bool startRequested; |
| bool shutdownRequested; |
| |
| public Server() |
| { |
| this.handle = ServerSafeHandle.NewServer(GetCompletionQueue(), IntPtr.Zero); |
| this.newServerRpcHandler = HandleNewServerRpc; |
| this.serverShutdownHandler = HandleServerShutdown; |
| } |
| |
| /// <summary> |
| /// Adds a service definition to the server. This is how you register |
| /// handlers for a service with the server. |
| /// Only call this before Start(). |
| /// </summary> |
| public void AddServiceDefinition(ServerServiceDefinition serviceDefinition) |
| { |
| lock (myLock) |
| { |
| Preconditions.CheckState(!startRequested); |
| foreach (var entry in serviceDefinition.CallHandlers) |
| { |
| callHandlers.Add(entry.Key, entry.Value); |
| } |
| } |
| } |
| |
| /// <summary> |
| /// Add a non-secure port on which server should listen. |
| /// Only call this before Start(). |
| /// </summary> |
| /// <returns>The port on which server will be listening.</returns> |
| /// <param name="host">the host</param> |
| /// <param name="port">the port. If zero, an unused port is chosen automatically.</param> |
| public int AddListeningPort(string host, int port) |
| { |
| return AddListeningPortInternal(host, port, null); |
| } |
| |
| /// <summary> |
| /// Add a non-secure port on which server should listen. |
| /// Only call this before Start(). |
| /// </summary> |
| /// <returns>The port on which server will be listening.</returns> |
| /// <param name="host">the host</param> |
| /// <param name="port">the port. If zero, , an unused port is chosen automatically.</param> |
| public int AddListeningPort(string host, int port, ServerCredentials credentials) |
| { |
| Preconditions.CheckNotNull(credentials); |
| return AddListeningPortInternal(host, port, credentials); |
| } |
| |
| /// <summary> |
| /// Starts the server. |
| /// </summary> |
| public void Start() |
| { |
| lock (myLock) |
| { |
| Preconditions.CheckState(!startRequested); |
| startRequested = true; |
| |
| handle.Start(); |
| AllowOneRpc(); |
| } |
| } |
| |
| /// <summary> |
| /// Requests server shutdown and when there are no more calls being serviced, |
| /// cleans up used resources. The returned task finishes when shutdown procedure |
| /// is complete. |
| /// </summary> |
| public async Task ShutdownAsync() |
| { |
| lock (myLock) |
| { |
| Preconditions.CheckState(startRequested); |
| Preconditions.CheckState(!shutdownRequested); |
| shutdownRequested = true; |
| } |
| |
| handle.ShutdownAndNotify(serverShutdownHandler); |
| await shutdownTcs.Task; |
| handle.Dispose(); |
| } |
| |
| /// <summary> |
| /// To allow awaiting termination of the server. |
| /// </summary> |
| public Task ShutdownTask |
| { |
| get |
| { |
| return shutdownTcs.Task; |
| } |
| } |
| |
| public void Kill() |
| { |
| handle.Dispose(); |
| } |
| |
| private int AddListeningPortInternal(string host, int port, ServerCredentials credentials) |
| { |
| lock (myLock) |
| { |
| Preconditions.CheckState(!startRequested); |
| var address = string.Format("{0}:{1}", host, port); |
| if (credentials != null) |
| { |
| using (var nativeCredentials = credentials.ToNativeCredentials()) |
| { |
| return handle.AddListeningPort(address, nativeCredentials); |
| } |
| } |
| else |
| { |
| return handle.AddListeningPort(address); |
| } |
| } |
| } |
| |
| /// <summary> |
| /// Allows one new RPC call to be received by server. |
| /// </summary> |
| private void AllowOneRpc() |
| { |
| lock (myLock) |
| { |
| if (!shutdownRequested) |
| { |
| handle.RequestCall(GetCompletionQueue(), newServerRpcHandler); |
| } |
| } |
| } |
| |
| /// <summary> |
| /// Selects corresponding handler for given call and handles the call. |
| /// </summary> |
| private async Task InvokeCallHandler(CallSafeHandle call, string method) |
| { |
| try |
| { |
| IServerCallHandler callHandler; |
| if (!callHandlers.TryGetValue(method, out callHandler)) |
| { |
| callHandler = new NoSuchMethodCallHandler(); |
| } |
| await callHandler.HandleCall(method, call, GetCompletionQueue()); |
| } |
| catch (Exception e) |
| { |
| Console.WriteLine("Exception while handling RPC: " + e); |
| } |
| } |
| |
| /// <summary> |
| /// Handles the native callback. |
| /// </summary> |
| private void HandleNewServerRpc(GRPCOpError error, IntPtr batchContextPtr) |
| { |
| try |
| { |
| var ctx = new BatchContextSafeHandleNotOwned(batchContextPtr); |
| |
| if (error != GRPCOpError.GRPC_OP_OK) |
| { |
| // TODO: handle error |
| } |
| |
| CallSafeHandle call = ctx.GetServerRpcNewCall(); |
| string method = ctx.GetServerRpcNewMethod(); |
| |
| // after server shutdown, the callback returns with null call |
| if (!call.IsInvalid) |
| { |
| Task.Run(async () => await InvokeCallHandler(call, method)); |
| } |
| |
| AllowOneRpc(); |
| } |
| catch (Exception e) |
| { |
| Console.WriteLine("Caught exception in a native handler: " + e); |
| } |
| } |
| |
| /// <summary> |
| /// Handles native callback. |
| /// </summary> |
| /// <param name="eventPtr"></param> |
| private void HandleServerShutdown(IntPtr eventPtr) |
| { |
| try |
| { |
| shutdownTcs.SetResult(null); |
| } |
| catch (Exception e) |
| { |
| Console.WriteLine("Caught exception in a native handler: " + e); |
| } |
| } |
| |
| private static CompletionQueueSafeHandle GetCompletionQueue() |
| { |
| return GrpcEnvironment.ThreadPool.CompletionQueue; |
| } |
| } |
| } |