1 /* 2 * Copyright 2021 Google Inc. All rights reserved. 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 import FlatBuffers 18 import GRPC 19 import Logging 20 import Model 21 import NIO 22 23 class Greeter: models_GreeterProvider { 24 25 var interceptors: models_GreeterServerInterceptorFactoryProtocol? 26 27 let greetings: [String] 28 29 init() { 30 greetings = ["Hi", "Hallo", "Ciao"] 31 } 32 33 func SayHello( 34 request: Message<models_HelloRequest>, 35 context: StatusOnlyCallContext) -> EventLoopFuture<Message<models_HelloReply>> 36 { 37 let recipient = request.object.name ?? "Stranger" 38 39 var builder = FlatBufferBuilder() 40 let off = builder.create(string: "Hello \(recipient)") 41 let root = models_HelloReply.createHelloReply(&builder, messageOffset: off) 42 builder.finish(offset: root) 43 return context.eventLoop.makeSucceededFuture(Message<models_HelloReply>(builder: &builder)) 44 } 45 46 func SayManyHellos( 47 request: Message<models_HelloRequest>, 48 context: StreamingResponseCallContext<Message<models_HelloReply>>) -> EventLoopFuture<GRPCStatus> 49 { 50 for name in greetings { 51 var builder = FlatBufferBuilder() 52 let off = builder.create(string: "\(name) \(request.object.name ?? "Unknown")") 53 let root = models_HelloReply.createHelloReply(&builder, messageOffset: off) 54 builder.finish(offset: root) 55 _ = context.sendResponse(Message<models_HelloReply>(builder: &builder)) 56 } 57 return context.eventLoop.makeSucceededFuture(.ok) 58 } 59 } 60 61 // Quieten the logs. 62 LoggingSystem.bootstrap { 63 var handler = StreamLogHandler.standardOutput(label: $0) 64 handler.logLevel = .critical 65 return handler 66 } 67 68 let group = MultiThreadedEventLoopGroup(numberOfThreads: 1) 69 defer { 70 try! group.syncShutdownGracefully() 71 } 72 73 // Create some configuration for the server: 74 let configuration = Server.Configuration( 75 target: .hostAndPort("localhost", 0), 76 eventLoopGroup: group, 77 serviceProviders: [Greeter()]) 78 79 // Start the server and print its address once it has started. 80 let server = Server.start(configuration: configuration) 81 server.map { 82 $0.channel.localAddress 83 }.whenSuccess { address in 84 print("server started on port \(address!.port!)") 85 } 86 87 // Wait on the server's `onClose` future to stop the program from exiting. 88 _ = try server.flatMap { 89 $0.onClose 90 }.wait() 91