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/*
* Copyright 2020 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
// Quieten the logs.
LoggingSystem.bootstrap {
var handler = StreamLogHandler.standardOutput(label: $0)
handler.logLevel = .critical
return handler
}
func greet(name: String, client greeter: GreeterServiceClient) {
// Form the request with the name, if one was provided.
var builder = FlatBufferBuilder()
let name = builder.create(string: name)
let root = HelloRequest.createHelloRequest(&builder, offsetOfName: name)
builder.finish(offset: root)
// Make the RPC call to the server.
let sayHello = greeter.SayHello(Message<HelloRequest>(builder: &builder))
// wait() on the response to stop the program from exiting before the response is received.
do {
let response = try sayHello.response.wait()
print("Greeter received: \(response.object.message)")
} catch {
print("Greeter failed: \(error)")
}
let surname = builder.create(string: "Name")
let manyRoot = ManyHellosRequest.createManyHellosRequest(
&builder,
offsetOfName: surname,
numGreetings: 2)
builder.finish(offset: manyRoot)
let call = greeter.SayManyHellos(Message(builder: &builder)) { message in
print(message.object.message)
}
let status = try! call.status.recover { _ in .processingError }.wait()
if status.code != .ok {
print("RPC failed: \(status)")
}
}
func main(args: [String]) {
// arg0 (dropped) is the program name. We expect arg1 to be the port, and arg2 (optional) to be
// the name sent in the request.
let arg1 = args.dropFirst(1).first
let arg2 = args.dropFirst(2).first
switch (arg1.flatMap(Int.init), arg2) {
case (.none, _):
print("Usage: PORT [NAME]")
exit(1)
case let (.some(port), name):
// Setup an `EventLoopGroup` for the connection to run on.
//
// See: https://github.com/apple/swift-nio#eventloops-and-eventloopgroups
let group = MultiThreadedEventLoopGroup(numberOfThreads: 1)
// Make sure the group is shutdown when we're done with it.
defer {
try! group.syncShutdownGracefully()
}
// Configure the channel, we're not using TLS so the connection is `insecure`.
let channel = ClientConnection.insecure(group: group)
.connect(host: "localhost", port: port)
// Close the connection when we're done with it.
defer {
try! channel.close().wait()
}
// Provide the connection to the generated client.
let greeter = GreeterServiceClient(channel: channel)
// Do the greeting.
greet(name: name ?? "Hello FlatBuffers!", client: greeter)
}
}
main(args: CommandLine.arguments)
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