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//===----------------------------------------------------------------------===//
//
// This source file is part of the SwiftNIO open source project
//
// Copyright (c) 2017-2023 Apple Inc. and the SwiftNIO project authors
// Licensed under Apache License v2.0
//
// See LICENSE.txt for license information
// See CONTRIBUTORS.txt for the list of SwiftNIO project authors
//
// SPDX-License-Identifier: Apache-2.0
//
//===----------------------------------------------------------------------===//
import NIOCore
import NIOPosix
/// Test measure a TCP channel throughput.
/// Server send 100K messages to the client,
/// measure the time from the very first message sent by the server
/// to the last message received by the client.
@available(macOS 10.15, iOS 13, tvOS 13, watchOS 6, *)
final class TCPThroughputBenchmark: Benchmark {
private let messages: Int
private let messageSize: Int
private var group: EventLoopGroup!
private var serverChannel: Channel!
private var serverHandler: ServerHandler!
private var clientChannel: Channel!
private var message: ByteBuffer!
private var serverEventLoop: EventLoop!
final class ServerHandler: ChannelInboundHandler {
public typealias InboundIn = ByteBuffer
public typealias OutboundOut = ByteBuffer
private var context: ChannelHandlerContext!
public func channelActive(context: ChannelHandlerContext) {
self.context = context
}
public func send(_ message: ByteBuffer, times count: Int) {
for _ in 0..<count {
_ = self.context.writeAndFlush(self.wrapOutboundOut(message.slice()))
}
}
}
final class StreamDecoder: ByteToMessageDecoder {
public typealias InboundIn = ByteBuffer
public typealias InboundOut = ByteBuffer
public func decode(context: ChannelHandlerContext, buffer: inout ByteBuffer) throws -> DecodingState {
if let messageSize = buffer.getInteger(at: buffer.readerIndex, as: UInt16.self) {
if buffer.readableBytes >= messageSize {
context.fireChannelRead(self.wrapInboundOut(buffer.readSlice(length: Int(messageSize))!))
return .continue
}
}
return .needMoreData
}
}
final class ClientHandler: ChannelInboundHandler {
public typealias InboundIn = ByteBuffer
public typealias OutboundOut = ByteBuffer
private var messagesReceived: Int
private var expectedMessages: Int?
private var completionPromise: EventLoopPromise<Void>?
init() {
self.messagesReceived = 0
}
func prepareRun(expectedMessages: Int, promise: EventLoopPromise<Void>) {
self.expectedMessages = expectedMessages
self.completionPromise = promise
}
public func channelRead(context: ChannelHandlerContext, data: NIOAny) {
self.messagesReceived += 1
if (self.expectedMessages == self.messagesReceived) {
let promise = self.completionPromise
self.messagesReceived = 0
self.expectedMessages = nil
self.completionPromise = nil
promise!.succeed()
}
}
}
public init(messages: Int, messageSize: Int) {
self.messages = messages
self.messageSize = messageSize
}
func setUp() throws {
self.group = MultiThreadedEventLoopGroup(numberOfThreads: 4)
let connectionEstablished: EventLoopPromise<EventLoop> = self.group.next().makePromise()
self.serverChannel = try ServerBootstrap(group: self.group)
.childChannelInitializer { channel in
self.serverHandler = ServerHandler()
connectionEstablished.succeed(channel.eventLoop)
return channel.pipeline.addHandler(self.serverHandler)
}
.bind(host: "127.0.0.1", port: 0)
.wait()
self.clientChannel = try ClientBootstrap(group: group)
.channelInitializer { channel in
channel.eventLoop.makeCompletedFuture {
try channel.pipeline.syncOperations.addHandler(ByteToMessageHandler(StreamDecoder()))
try channel.pipeline.syncOperations.addHandler(ClientHandler())
}
}
.connect(to: serverChannel.localAddress!)
.wait()
var message = self.serverChannel.allocator.buffer(capacity: self.messageSize)
message.writeInteger(UInt16(messageSize), as:UInt16.self)
for idx in 0..<(self.messageSize - MemoryLayout<UInt16>.stride) {
message.writeInteger(UInt8(truncatingIfNeeded: idx), endianness:.little, as:UInt8.self)
}
self.message = message
self.serverEventLoop = try connectionEstablished.futureResult.wait()
}
func tearDown() {
try! self.clientChannel.close().wait()
try! self.serverChannel.close().wait()
try! self.group.syncShutdownGracefully()
}
func run() throws -> Int {
let isDonePromise = self.clientChannel.eventLoop.makePromise(of: Void.self)
let clientChannel = self.clientChannel!
let expectedMessages = self.messages
try clientChannel.eventLoop.submit {
try clientChannel.pipeline.syncOperations.handler(type: ClientHandler.self).prepareRun(expectedMessages: expectedMessages, promise: isDonePromise)
}.wait()
let serverHandler = self.serverHandler!
let message = self.message!
let messages = self.messages
self.serverEventLoop.execute {
serverHandler.send(message, times: messages)
}
try isDonePromise.futureResult.wait()
return 0
}
}
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