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/*
* Copyright 2021 Google Inc. All rights reserved.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
import FlatBuffers
import GRPC
import Logging
import Model
import NIO
class Greeter: models_GreeterProvider {
var interceptors: models_GreeterServerInterceptorFactoryProtocol?
let greetings: [String]
init() {
greetings = ["Hi", "Hallo", "Ciao"]
}
func SayHello(
request: Message<models_HelloRequest>,
context: StatusOnlyCallContext)
-> EventLoopFuture<Message<models_HelloReply>>
{
let recipient = request.object.name ?? "Stranger"
var builder = FlatBufferBuilder()
let off = builder.create(string: "Hello \(recipient)")
let root = models_HelloReply.createHelloReply(&builder, messageOffset: off)
builder.finish(offset: root)
return context.eventLoop
.makeSucceededFuture(Message<models_HelloReply>(builder: &builder))
}
func SayManyHellos(
request: Message<models_HelloRequest>,
context: StreamingResponseCallContext<Message<models_HelloReply>>)
-> EventLoopFuture<GRPCStatus>
{
for name in greetings {
var builder = FlatBufferBuilder()
let off = builder
.create(string: "\(name) \(request.object.name ?? "Unknown")")
let root = models_HelloReply.createHelloReply(
&builder,
messageOffset: off)
builder.finish(offset: root)
_ = context.sendResponse(Message<models_HelloReply>(builder: &builder))
}
return context.eventLoop.makeSucceededFuture(.ok)
}
}
// Quieten the logs.
LoggingSystem.bootstrap {
var handler = StreamLogHandler.standardOutput(label: $0)
handler.logLevel = .critical
return handler
}
let group = MultiThreadedEventLoopGroup(numberOfThreads: 1)
defer {
try! group.syncShutdownGracefully()
}
// Create some configuration for the server:
let configuration = Server.Configuration(
target: .hostAndPort("localhost", 0),
eventLoopGroup: group,
serviceProviders: [Greeter()])
// Start the server and print its address once it has started.
let server = Server.start(configuration: configuration)
server.map {
$0.channel.localAddress
}.whenSuccess { address in
print("server started on port \(address!.port!)")
}
// Wait on the server's `onClose` future to stop the program from exiting.
_ = try server.flatMap {
$0.onClose
}.wait()
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