134 lines
4.3 KiB
Swift
134 lines
4.3 KiB
Swift
//
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// SDLanServer.swift
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// Tun
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//
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// Created by 安礼成 on 2024/1/31.
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//
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import Foundation
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import NIOCore
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import NIOPosix
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import SwiftProtobuf
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enum SDLUDPHoleError: Error {
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case invalidLocalAddress
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}
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// 处理和sn-server服务器之间的通讯
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final class SDLUDPHole: ChannelInboundHandler {
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typealias InboundIn = AddressedEnvelope<ByteBuffer>
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// 事件
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enum HoleEvent {
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case ready
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case closed
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case errorCaught
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}
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private var isStopped: Bool = false
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private let group = MultiThreadedEventLoopGroup(numberOfThreads: 1)
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private var channel: Channel?
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public let messageStream: AsyncStream<(SocketAddress, SDLHoleMessage)>
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private let messageContinuation: AsyncStream<(SocketAddress, SDLHoleMessage)>.Continuation
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// 事件相关逻辑
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public let eventStream: AsyncStream<HoleEvent>
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private let eventContinuation: AsyncStream<HoleEvent>.Continuation
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// 启动函数
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init() throws {
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let (stream, continuation) = AsyncStream.makeStream(of: (SocketAddress, SDLHoleMessage).self, bufferingPolicy: .bufferingNewest(2048))
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self.messageStream = stream
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self.messageContinuation = continuation
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let eventPair = AsyncStream.makeStream(of: HoleEvent.self)
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self.eventStream = eventPair.stream
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self.eventContinuation = eventPair.continuation
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}
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func start() throws -> SocketAddress {
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let bootstrap = DatagramBootstrap(group: group)
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.channelOption(ChannelOptions.socketOption(.so_reuseaddr), value: 1)
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.channelInitializer { channel in
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channel.pipeline.addHandler(self)
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}
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// 绑定到IPv4通配地址，只处理IPv4流量
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let channel = try bootstrap.bind(host: "0.0.0.0", port: 0).wait()
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guard let localAddress = channel.localAddress else {
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throw SDLUDPHoleError.invalidLocalAddress
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}
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self.channel = channel
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eventContinuation.yield(.ready)
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return localAddress
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}
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// --MARK: ChannelInboundHandler delegate
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func channelRead(context: ChannelHandlerContext, data: NIOAny) {
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let envelope = unwrapInboundIn(data)
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var buffer = envelope.data
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let remoteAddress = envelope.remoteAddress
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if let rawBytes = buffer.getBytes(at: buffer.readerIndex, length: buffer.readableBytes) {
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SDLLogger.log("[SDLUDPHole] get raw bytes: \(rawBytes.count), from: \(remoteAddress)", for: .debug)
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}
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do {
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if let message = try SDLHoleMessage.decode(buffer: &buffer) {
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self.messageContinuation.yield((remoteAddress, message))
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} else {
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SDLLogger.log("[SDLUDPHole] decode message, get null", for: .debug)
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}
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} catch let err {
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SDLLogger.log("[SDLUDPHole] decode message, get error: \(err)", for: .debug)
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}
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}
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func channelInactive(context: ChannelHandlerContext) {
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SDLLogger.log("[SDLUDPHole] channelInactive", for: .debug)
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self.eventContinuation.yield(.closed)
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}
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func errorCaught(context: ChannelHandlerContext, error: any Error) {
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SDLLogger.log("[SDLUDPHole] channel error: \(error)", for: .debug)
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context.close(promise: nil)
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self.eventContinuation.yield(.errorCaught)
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}
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// MARK: 处理写入逻辑
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func send(type: SDLPacketType, data: Data, remoteAddress: SocketAddress) {
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guard let channel = self.channel else {
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return
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}
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var buffer = channel.allocator.buffer(capacity: data.count + 1)
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buffer.writeBytes([type.rawValue])
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buffer.writeBytes(data)
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let envelope = AddressedEnvelope<ByteBuffer>(remoteAddress: remoteAddress, data: buffer)
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_ = channel.eventLoop.submit {
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channel.writeAndFlush(envelope, promise: nil)
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}
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}
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func stop() {
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guard !self.isStopped else {
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return
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}
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self.isStopped = true
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SDLLogger.log("[SDLUDPHole] stop", for: .debug)
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self.messageContinuation.finish()
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self.eventContinuation.finish()
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self.channel = nil
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try? self.group.syncShutdownGracefully()
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}
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}
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