初始版本：事件回调式 WebSocket 客户端与服务端（RFC 6455）
This commit is contained in:
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/*
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* simcu::websocket.server —— 服务端单条 WebSocket 连接。
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*
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* 由 WebSocketServer 在握手成功后创建并暴露给 on('connection') 回调。
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* 提供 send/sendText/sendBinary/ping/close/terminate，以及连接级事件：
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* conn.on("message", { (msg) => ... })
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* conn.on("close", { (code, reason) => ... })
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* conn.on("error", { (e) => ... })
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*/
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package simcu::websocket.server
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import std.net.IPSocketAddress
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import std.net.TcpSocket
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import std.sync.Mutex
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import std.time.*
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import simcu::websocket.common.FrameStream
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import simcu::websocket.common.MessageType
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import simcu::websocket.common.ReadyState
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import simcu::websocket.common.WebSocketMessage
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import simcu::websocket.common.WebSocketException
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import simcu::websocket.common.WsEvents
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/// 服务端单条 WebSocket 连接（事件回调式）。
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public class WebSocketConnection {
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private let parent: ?WebSocketServer
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private let frame: FrameStream
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private let stateLock = Mutex()
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private var state: ReadyState = ReadyState.Open
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/// 连接唯一编号（由服务端分配，用于连接集合的引用比较）。
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internal let connId: Int64
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/// 连接级事件：收到消息（不含父级 connection 参数）。
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public var onMessage: (WebSocketMessage) -> Unit = { m => () }
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/// 连接级事件：连接关闭，参数 (关闭码, 关闭原因)。
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public var onClose: (Int64, String) -> Unit = { c, r => () }
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/// 连接级事件：运行时错误。
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public var onError: (Exception) -> Unit = { e => () }
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internal init(parent: ?WebSocketServer, frame: FrameStream, connId: Int64) {
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this.parent = parent
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this.frame = frame
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this.connId = connId
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}
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/// 当前连接状态。
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public prop readyState: ReadyState {
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get() { state }
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}
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/// 连接是否处于 Open。
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public func isOpen(): Bool {
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state == ReadyState.Open
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}
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/// 远端地址（ip:port 或套接字地址字符串）。
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public prop remoteAddress: String {
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get() {
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let sa = frame.remoteAddress()
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if (let Some(ip) <- (sa as IPSocketAddress)) {
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"${ip.address}:${ip.port}"
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} else {
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sa.toString()
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}
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}
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}
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/// 注册连接级事件。支持 "message" / "close" / "error"。
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public func on(event: String, listener: (WebSocketMessage) -> Unit): Unit {
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if (event == WsEvents.message) {
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onMessage = listener
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} else {
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throw WebSocketException("不支持的事件: ${event}")
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}
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}
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/// 注册连接级事件。支持 "close" / "error"。
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public func on(event: String, listener: (Int64, String) -> Unit): Unit {
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if (event == WsEvents.close) {
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onClose = listener
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} else {
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throw WebSocketException("不支持的事件: ${event}")
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}
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}
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/// 注册连接级事件。支持 "error"。
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public func on(event: String, listener: (Exception) -> Unit): Unit {
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if (event == WsEvents.error) {
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onError = listener
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} else {
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throw WebSocketException("不支持的事件: ${event}")
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}
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}
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/// 发送消息。
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public func send(message: WebSocketMessage): Unit {
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ensureOpen()
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if (message.`type` == MessageType.Text) {
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frame.writeFrame(1, message.bytes)
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} else {
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frame.writeFrame(2, message.bytes)
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}
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}
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/// 发送文本消息。
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public func sendText(text: String): Unit {
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ensureOpen()
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frame.writeText(text)
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}
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/// 发送二进制消息。
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public func sendBinary(data: Array<Byte>): Unit {
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ensureOpen()
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frame.writeBinary(data)
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}
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/// 发送 Ping（心跳保活）。
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public func ping(): Unit {
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ensureOpen()
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frame.writePing(Array<Byte>(0, repeat: 0))
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}
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/// 发起关闭握手：发送 close 帧，等待对端回执；5 秒兜底强制断开。
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public func close(code!: Int64 = 1000, reason!: String = ""): Unit {
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synchronized(stateLock) {
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if (state != ReadyState.Open) {
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return
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}
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state = ReadyState.Closing
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}
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try {
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frame.writeClose(code, reason)
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} catch (_) {
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terminate()
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return
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}
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spawn { =>
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sleep(Duration.second * 5)
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if (state == ReadyState.Closing) {
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terminate()
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}
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}
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}
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/// 立即断开底层连接（不发送 close 帧）。
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public func terminate(): Unit {
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synchronized(stateLock) {
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if (state == ReadyState.Closed) {
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return
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}
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state = ReadyState.Closed
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}
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try {
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frame.close()
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} catch (_) {
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()
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}
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}
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private func ensureOpen(): Unit {
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if (state != ReadyState.Open) {
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throw WebSocketException("连接未打开（readyState=${state}）")
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}
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}
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/// 读循环（由 WebSocketServer 的连接处理协程调用）。
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internal func runReadLoop(): Unit {
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var code: Int64 = 1006
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var reason: String = ""
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try {
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while (true) {
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let m = frame.readMessage()
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match (m) {
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case None =>
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break
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case Some(f) =>
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if (f.opcode == 8) {
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let (c, r) = FrameStream.parseClosePayload(f.payload)
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code = c
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reason = r
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if (state == ReadyState.Open) {
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try {
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frame.writeClose(c, r)
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} catch (_) {
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()
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}
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}
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break
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} else {
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let msg = if (f.opcode == 1) {
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WebSocketMessage(MessageType.Text, f.payload)
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} else {
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WebSocketMessage(MessageType.Binary, f.payload)
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}
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onMessage(msg)
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if (let Some(p) <- parent) {
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p.fireMessage(this, msg)
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}
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}
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}
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}
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} catch (e: Exception) {
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code = 1006
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if (state != ReadyState.Closing) {
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onError(e)
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if (let Some(p) <- parent) {
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p.fireError(e)
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}
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}
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}
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synchronized(stateLock) {
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state = ReadyState.Closed
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}
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try {
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frame.close()
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} catch (_) {
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()
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}
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if (let Some(p) <- parent) {
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p.removeConnection(this)
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}
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onClose(code, reason)
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if (let Some(p) <- parent) {
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p.fireClose(this, code, reason)
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}
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}
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}
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@@ -0,0 +1,329 @@
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/*
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* simcu::websocket.server —— 事件回调式 WebSocket 服务端（RFC 6455）。
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*
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* 用法：
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* let server = WebSocketServer(bindAt: 8080)
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* server.on("connection", { (conn) =>
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* println("新连接: ${conn.remoteAddress}")
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* conn.on("message", { (msg) => conn.sendText("echo: ${msg.text}") })
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* })
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* server.listen()
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* ...
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* server.close() // 停止监听并断开所有连接
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*
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* 服务端事件：on('connection') / on('message') / on('close') / on('error')。
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* 连接方法：send / sendText / sendBinary / ping / close / terminate。
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* 集群方法：broadcast / broadcastText / broadcastBinary / connectionCount。
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*/
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package simcu::websocket.server
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import std.collection.ArrayList
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import std.net.IPSocketAddress
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import std.net.SocketException
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import std.net.TcpServerSocket
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import std.net.TcpSocket
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import std.sync.Mutex
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import simcu::websocket.common.FrameStream
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import simcu::websocket.common.MessageType
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import simcu::websocket.common.WebSocketMessage
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import simcu::websocket.common.WebSocketException
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import simcu::websocket.common.WsEvents
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/// 事件回调式 WebSocket 服务端。
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public class WebSocketServer {
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private let bindPort: UInt16
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private let pathFilter: ?String
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private let maxPayload: Int64
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private var serverSock: ?TcpServerSocket = None
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private var running = false
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private var connections = ArrayList<WebSocketConnection>()
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private var nextConnId: Int64 = 1
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private let connLock = Mutex()
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/// 服务端事件：有连接完成握手时触发（参数为连接对象）。
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public var onConnection: (WebSocketConnection) -> Unit = { conn => () }
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/// 服务端事件：任意连接收到消息时触发（参数为连接对象与消息）。
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public var onMessage: (WebSocketConnection, WebSocketMessage) -> Unit = { conn, msg => () }
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/// 服务端事件：任意连接关闭时触发（参数为连接对象、关闭码、原因）。
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public var onClose: (WebSocketConnection, Int64, String) -> Unit = { conn, code, reason => () }
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/// 服务端事件：监听或连接运行时错误时触发（参数为异常）。
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public var onError: (Exception) -> Unit = { e => () }
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/// @param bindAt 监听端口，0 表示随机空闲端口（listen 后通过 localPort 读取）。
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/// @param path 仅接受该路径的握手请求（None 表示不限制）。
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/// @param maxPayload 单条消息最大字节数，默认 64KB。
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public init(bindAt!: UInt16 = 0, path!: ?String = None, maxPayload!: Int64 = 65536) {
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this.bindPort = bindAt
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this.pathFilter = path
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this.maxPayload = maxPayload
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}
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/// 注册服务端事件。支持 "connection"。
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public func on(event: String, listener: (WebSocketConnection) -> Unit): Unit {
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if (event == WsEvents.connection) {
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onConnection = listener
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} else {
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throw WebSocketException("不支持的事件: ${event}")
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}
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}
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/// 注册服务端事件。支持 "message"。
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public func on(event: String, listener: (WebSocketConnection, WebSocketMessage) -> Unit): Unit {
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if (event == WsEvents.message) {
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onMessage = listener
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} else {
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throw WebSocketException("不支持的事件: ${event}")
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}
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}
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/// 注册服务端事件。支持 "close"。
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public func on(event: String, listener: (WebSocketConnection, Int64, String) -> Unit): Unit {
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if (event == WsEvents.close) {
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onClose = listener
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} else {
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throw WebSocketException("不支持的事件: ${event}")
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}
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}
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/// 注册服务端事件。支持 "error"。
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public func on(event: String, listener: (Exception) -> Unit): Unit {
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if (event == WsEvents.error) {
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onError = listener
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} else {
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throw WebSocketException("不支持的事件: ${event}")
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}
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}
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/// 启动监听：bind + accept 循环，每连接一个协程处理握手与读循环。
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public func listen(backlog!: Int64 = 128): Unit {
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if (running) {
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throw WebSocketException("服务端已在监听")
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}
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let s = TcpServerSocket(bindAt: bindPort)
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s.backlogSize = backlog
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s.bind()
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serverSock = Some(s)
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running = true
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spawn { => acceptLoop() }
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}
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/// 实际监听端口（bindAt=0 时用于发现随机端口）。
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public prop localPort: UInt16 {
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get() {
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let sa = serverSock.getOrThrow().localAddress
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if (let Some(ip) <- (sa as IPSocketAddress)) {
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ip.port
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} else {
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throw WebSocketException("无法解析本地监听端口")
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}
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}
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}
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/// 当前在线连接数。
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public prop connectionCount: Int64 {
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get() {
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synchronized(connLock) {
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connections.size
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}
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}
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}
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/// 停止监听并强制断开所有连接（每连接会触发自身 close 事件）。
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public func close(): Unit {
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running = false
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if (let Some(s) <- serverSock) {
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try {
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s.close()
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} catch (_) {
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()
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}
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serverSock = None
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}
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let snapshot = snapshotConnections()
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for (c in snapshot) {
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c.terminate()
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}
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}
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/// 向所有在线连接广播消息（单个连接发送失败不影响其余连接）。
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public func broadcast(message: WebSocketMessage): Unit {
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let snapshot = snapshotConnections()
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for (c in snapshot) {
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try {
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c.send(message)
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} catch (_) {
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()
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}
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}
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}
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/// 广播文本消息。
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public func broadcastText(text: String): Unit {
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broadcast(WebSocketMessage.fromText(text))
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}
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/// 广播二进制消息。
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public func broadcastBinary(data: Array<Byte>): Unit {
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broadcast(WebSocketMessage.fromBinary(data))
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}
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// ===== 内部回调转发（供 WebSocketConnection 调用）=====
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internal func fireMessage(conn: WebSocketConnection, msg: WebSocketMessage): Unit {
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onMessage(conn, msg)
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}
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internal func fireClose(conn: WebSocketConnection, code: Int64, reason: String): Unit {
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onClose(conn, code, reason)
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}
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internal func fireError(e: Exception): Unit {
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onError(e)
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}
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internal func addConnection(conn: WebSocketConnection): Unit {
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synchronized(connLock) {
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connections.add(conn)
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}
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}
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internal func allocateConnId(): Int64 {
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synchronized(connLock) {
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let id = nextConnId
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nextConnId += 1
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id
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}
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}
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internal func removeConnection(conn: WebSocketConnection): Unit {
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synchronized(connLock) {
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var idx: Int64 = -1
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for (i in 0..connections.size) {
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if (connections[i].connId == conn.connId) {
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idx = i
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break
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}
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}
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if (idx >= 0) {
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connections.remove(at: idx)
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}
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}
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}
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private func snapshotConnections(): ArrayList<WebSocketConnection> {
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synchronized(connLock) {
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let copy = ArrayList<WebSocketConnection>()
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for (c in connections) {
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copy.add(c)
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}
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copy
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}
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}
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// ===== 监听与握手 =====
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private func acceptLoop(): Unit {
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while (running) {
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try {
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let s = serverSock
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if (let Some(sock) <- s) {
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let client = sock.accept()
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spawn { => handleConnection(client) }
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} else {
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return
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}
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} catch (e: SocketException) {
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if (!running) {
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return
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}
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onError(e)
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} catch (e: Exception) {
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if (!running) {
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return
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}
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onError(e)
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}
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}
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}
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private func handleConnection(sock: TcpSocket): Unit {
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let fs = FrameStream(sock, maxPayload, false)
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try {
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let request = fs.readHttpHeader()
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let lines = request.split("\r\n")
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if (lines.size == 0 || !lines[0].startsWith("GET ")) {
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reject(sock, 400, "Bad Request")
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return
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}
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let parts = lines[0].split(" ")
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if (parts.size < 3) {
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reject(sock, 400, "Bad Request")
|
||||
return
|
||||
}
|
||||
if (let Some(p) <- pathFilter) {
|
||||
if (parts[1] != p) {
|
||||
reject(sock, 404, "Not Found")
|
||||
return
|
||||
}
|
||||
}
|
||||
var upgradeOk = false
|
||||
var connectionOk = false
|
||||
var key = ""
|
||||
for (i in 1..lines.size) {
|
||||
let line = lines[i]
|
||||
let ci = line.indexOf(":")
|
||||
if (let Some(c) <- ci) {
|
||||
let name = line[0..c].toAsciiLower()
|
||||
let value = line[c + 1..].trimAscii()
|
||||
if (name == "upgrade") {
|
||||
upgradeOk = value.toAsciiLower().contains("websocket")
|
||||
}
|
||||
if (name == "connection") {
|
||||
connectionOk = value.toAsciiLower().contains("upgrade")
|
||||
}
|
||||
if (name == "sec-websocket-key") {
|
||||
key = value
|
||||
}
|
||||
}
|
||||
}
|
||||
if (!upgradeOk || !connectionOk || key == "") {
|
||||
reject(sock, 400, "Bad Request")
|
||||
return
|
||||
}
|
||||
|
||||
// 101 响应
|
||||
let accept = FrameStream.computeAccept(key)
|
||||
let resp = StringBuilder()
|
||||
resp.append("HTTP/1.1 101 Switching Protocols\r\n")
|
||||
resp.append("Upgrade: websocket\r\n")
|
||||
resp.append("Connection: Upgrade\r\n")
|
||||
resp.append("Sec-WebSocket-Accept: ${accept}\r\n\r\n")
|
||||
sock.write(resp.toString().toArray())
|
||||
sock.flush()
|
||||
|
||||
let conn = WebSocketConnection(Some(this), fs, allocateConnId())
|
||||
addConnection(conn)
|
||||
onConnection(conn)
|
||||
conn.runReadLoop()
|
||||
} catch (e: Exception) {
|
||||
// 握手阶段失败：上报服务端 error 事件
|
||||
onError(e)
|
||||
}
|
||||
}
|
||||
|
||||
private func reject(sock: TcpSocket, status: Int64, message: String): Unit {
|
||||
try {
|
||||
let resp = "HTTP/1.1 ${status} ${message}\r\nContent-Length: 0\r\nConnection: close\r\n\r\n"
|
||||
sock.write(resp.toArray())
|
||||
sock.flush()
|
||||
} catch (_) {
|
||||
()
|
||||
}
|
||||
try {
|
||||
sock.close()
|
||||
} catch (_) {
|
||||
()
|
||||
}
|
||||
}
|
||||
}
|
||||
Reference in New Issue
Block a user