104 lines
3.8 KiB
Swift
104 lines
3.8 KiB
Swift
//===----------------------------------------------------------------------===//
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//
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// This source file is part of the SwiftNIO open source project
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//
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// Copyright (c) 2017-2018 Apple Inc. and the SwiftNIO project authors
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// Licensed under Apache License v2.0
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//
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// See LICENSE.txt for license information
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// See CONTRIBUTORS.txt for the list of SwiftNIO project authors
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//
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// SPDX-License-Identifier: Apache-2.0
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//
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//===----------------------------------------------------------------------===//
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import NIO
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private final class EchoHandler: ChannelInboundHandler {
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public typealias InboundIn = ByteBuffer
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public typealias OutboundOut = ByteBuffer
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public func channelRead(context: ChannelHandlerContext, data: NIOAny) {
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// As we are not really interested getting notified on success or failure we just pass nil as promise to
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// reduce allocations.
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context.write(data, promise: nil)
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}
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public func channelReadComplete(context: ChannelHandlerContext) {
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// As we are not really interested getting notified on success or failure we just pass nil as promise to
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// reduce allocations.
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context.flush()
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}
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public func errorCaught(context: ChannelHandlerContext, error: Error) {
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print("error: ", error)
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// As we are not really interested getting notified on success or failure we just pass nil as promise to
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// reduce allocations.
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context.close(promise: nil)
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}
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}
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// We don't need more than one thread, as we're creating only one datagram channel.
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let group = MultiThreadedEventLoopGroup(numberOfThreads: 1)
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var bootstrap = DatagramBootstrap(group: group)
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// Specify backlog and enable SO_REUSEADDR
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.channelOption(ChannelOptions.socket(SocketOptionLevel(SOL_SOCKET), SO_REUSEADDR), value: 1)
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// Set the handlers that are applied to the bound channel
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.channelInitializer { channel in
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// Ensure we don't read faster than we can write by adding the BackPressureHandler into the pipeline.
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channel.pipeline.addHandler(EchoHandler())
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}
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defer {
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try! group.syncShutdownGracefully()
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}
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var arguments = CommandLine.arguments.dropFirst(0) // just to get an ArraySlice<String> from [String]
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if arguments.dropFirst().first == .some("--enable-gathering-reads") {
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bootstrap = bootstrap.channelOption(ChannelOptions.datagramVectorReadMessageCount, value: 30)
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bootstrap = bootstrap.channelOption(ChannelOptions.recvAllocator, value: FixedSizeRecvByteBufferAllocator(capacity: 30 * 2048))
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arguments = arguments.dropFirst()
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}
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let arg1 = arguments.dropFirst().first
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let arg2 = arguments.dropFirst().dropFirst().first
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let defaultHost = "::1"
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let defaultPort = 9999
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enum BindTo {
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case ip(host: String, port: Int)
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case unixDomainSocket(path: String)
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}
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let bindTarget: BindTo
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switch (arg1, arg1.flatMap(Int.init), arg2.flatMap(Int.init)) {
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case (.some(let h), _ , .some(let p)):
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/* we got two arguments, let's interpret that as host and port */
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bindTarget = .ip(host: h, port: p)
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case (.some(let portString), .none, _):
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/* couldn't parse as number, expecting unix domain socket path */
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bindTarget = .unixDomainSocket(path: portString)
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case (_, .some(let p), _):
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/* only one argument --> port */
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bindTarget = .ip(host: defaultHost, port: p)
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default:
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bindTarget = .ip(host: defaultHost, port: defaultPort)
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}
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let channel = try { () -> Channel in
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switch bindTarget {
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case .ip(let host, let port):
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return try bootstrap.bind(host: host, port: port).wait()
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case .unixDomainSocket(let path):
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return try bootstrap.bind(unixDomainSocketPath: path).wait()
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}
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}()
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print("Server started and listening on \(channel.localAddress!)")
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// This will never unblock as we don't close the channel
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try channel.closeFuture.wait()
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print("Server closed")
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