源文件名全部改为蛇形命名，public 类型名与 import 路径不变；README 目录结构同步更新；版本升级 1.2.0

2026-08-25 12:03:46 +08:00
parent bcaf3d76a2
commit cbfa3fcbdc
9 changed files with 13 additions and 8 deletions
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+/*
+ * simcu::websocket.server —— WebSocket 服务端（RFC 6455），handler 接口式。
+ *
+ * 用法：
+ *   let server = WebSocketServer(8080)
+ *   server.addHandler("/ws") { => MyHandler() }    // 路径 -> 工厂，每次握手创建独立 handler 实例
+ *   server.start()
+ *   ...
+ *   server.close()        // 停止监听并断开所有连接
+ *
+ * 多 handler 按注册路径路由：握手时按请求路径匹配 addHandler 的 path，匹配则调用工厂
+ * 创建一个新的 handler 实例（每连接一个），无匹配返回 404。
+ * 连接方法：send / ping / close / terminate（send 三重重载：WebSocketMessage / String / Array<Byte>）。
+ * 组管理（链式）：ws.group(name).join/leave/count/isEmpty/connIds，ws.conn(connId).groups()，ws.groups()。
+ * 发送门面（链式）：group(name).send / conn(connId).send（均为三重重载）。
+ * 广播：broadcast（三重重载）/ connectionCount。
+ */
+package simcu::websocket.server
+
+import std.collection.{ArrayList, HashMap}
+import std.net.IPSocketAddress
+import std.net.SocketException
+import std.net.TcpServerSocket
+import std.net.TcpSocket
+import std.sync.Mutex
+
+import simcu::websocket.common.FrameStream
+import simcu::websocket.common.WebSocketMessage
+import simcu::websocket.common.WebSocketException
+
+/// WebSocket 服务端（按路径工厂路由：每连接创建独立 handler 实例，支持组管理/单播/组播/广播）。
+public class WebSocketServer {
+    private let bindPort: UInt16
+    private let maxPayload: Int64
+    private var pathFactories = HashMap<String, () -> IWebsocketHandler>()
+    private var serverSock: ?TcpServerSocket = None
+    private var running = false
+    private var connections = HashMap<Int64, WebSocketConnection>()
+    internal var connGroups = HashMap<String, ArrayList<Int64>>()
+    private var nextConnId: Int64 = 1
+    internal let connLock = Mutex()
+
+    /// @param port 监听端口，0 表示随机空闲端口（start 后通过 localPort 读取）。
+    /// @param maxPayload 单条消息最大字节数，默认 64KB。
+    public init(port: Int64, maxPayload!: Int64 = 65536) {
+        this.bindPort = UInt16(port)
+        this.maxPayload = maxPayload
+    }
+
+    /// 注册一个 handler 工厂并绑定到端点路径（多 handler 按路径路由）。
+    /// 每次握手成功都会调用工厂创建一个新的 handler 实例（每连接一个），
+    /// 因此不要在工厂里复用有状态对象（如 scoped 服务），应让各回调按需现场解析。
+    public func addHandler(path: String, factory: () -> IWebsocketHandler): Unit {
+        pathFactories[path] = factory
+    }
+
+    /// 启动监听：bind + accept 循环，每连接一个协程处理握手与读循环。
+    public func start(backlog!: Int64 = 128): Unit {
+        if (running) {
+            throw WebSocketException("服务端已在监听")
+        }
+        let s = TcpServerSocket(bindAt: bindPort)
+        s.backlogSize = backlog
+        s.bind()
+        serverSock = Some(s)
+        running = true
+        var paths = ""
+        for (p in pathFactories.keys()) {
+            paths = if (paths.isEmpty()) { p } else { "${paths}, ${p}" }
+        }
+        println("[websocket] 已监听 端口=${localPort} 端点=[${paths}]")
+        spawn { => acceptLoop() }
+    }
+
+    /// 实际监听端口（bindAt=0 时用于发现随机端口）。
+    public prop localPort: UInt16 {
+        get() {
+            let sa = serverSock.getOrThrow().localAddress
+            if (let Some(ip) <- (sa as IPSocketAddress)) {
+                ip.port
+            } else {
+                throw WebSocketException("无法解析本地监听端口")
+            }
+        }
+    }
+
+    /// 当前在线连接数。
+    public prop connectionCount: Int64 {
+        get() {
+            synchronized(connLock) {
+                connections.size
+            }
+        }
+    }
+
+    /// 停止监听并强制断开所有连接（每连接会触发自身 close 回调）。
+    public func close(): Unit {
+        running = false
+        if (let Some(s) <- serverSock) {
+            try {
+                s.close()
+            } catch (_) {
+                ()
+            }
+            serverSock = None
+        }
+        let snapshot = snapshotConnections()
+        for (c in snapshot) {
+            c.terminate()
+        }
+    }
+
+    /// 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）。
+    public func broadcast(message: WebSocketMessage): Unit {
+        let snapshot = snapshotConnections()
+        for (c in snapshot) {
+            try {
+                c.send(message)
+            } catch (_) {
+                ()
+            }
+        }
+    }
+
+    /// 广播文本消息（三重重载：WebSocketMessage / String / Array<Byte>）。
+    public func broadcast(text: String): Unit {
+        broadcast(WebSocketMessage.fromText(text))
+    }
+
+    /// 广播二进制消息。
+    public func broadcast(data: Array<Byte>): Unit {
+        broadcast(WebSocketMessage.fromBinary(data))
+    }
+
+    /// 所有组名（快照）。
+    public func groups(): ArrayList<String> {
+        synchronized(connLock) {
+            let copy = ArrayList<String>()
+            for ((k, _) in connGroups) {
+                copy.add(k)
+            }
+            copy
+        }
+    }
+
+    // ===== 链式发送门面 =====
+
+    /// 组门面(链式): ws.group("authed").join(conn).send("hi").send(data)；count/isEmpty/connIds 读组信息。
+    public func group(name: String): WebSocketGroupSender {
+        WebSocketGroupSender(this, name)
+    }
+
+    /// 连接门面(链式): ws.conn(connId).send("hi").send(data)；groups() 查连接所属组。
+    public func conn(connId: Int64): WebSocketConnSender {
+        WebSocketConnSender(this, connId)
+    }
+
+    // ===== 内部连接管理 =====
+
+    internal func addConnection(conn: WebSocketConnection): Unit {
+        synchronized(connLock) {
+            connections[conn.connId] = conn
+        }
+    }
+
+    internal func allocateConnId(): Int64 {
+        synchronized(connLock) {
+            let id = nextConnId
+            nextConnId += 1
+            id
+        }
+    }
+
+    internal func removeConnection(conn: WebSocketConnection): Unit {
+        synchronized(connLock) {
+            connections.remove(conn.connId)
+            removeFromAllGroups(conn.connId)
+        }
+    }
+
+    internal func getConn(connId: Int64): ?WebSocketConnection {
+        synchronized(connLock) {
+            connections.get(connId)
+        }
+    }
+
+    private func removeFromAllGroups(connId: Int64): Unit {
+        var toRemove = ArrayList<String>()
+        for ((g, list) in connGroups) {
+            if (listHasConnId(list, connId)) {
+                removeConnId(list, connId)
+                if (list.size == 0) {
+                    toRemove.add(g)
+                }
+            }
+        }
+        for (g in toRemove) {
+            connGroups.remove(g)
+        }
+    }
+
+    private func snapshotConnections(): ArrayList<WebSocketConnection> {
+        synchronized(connLock) {
+            let copy = ArrayList<WebSocketConnection>()
+            for (c in connections.values()) {
+                copy.add(c)
+            }
+            copy
+        }
+    }
+
+    // ===== 监听与握手 =====
+
+    /// 按请求路径匹配 handler 工厂。无匹配返回 None。
+    private func findFactory(path: String): ?() -> IWebsocketHandler {
+        pathFactories.get(path)
+    }
+
+    private func acceptLoop(): Unit {
+        while (running) {
+            try {
+                let s = serverSock
+                if (let Some(sock) <- s) {
+                    let client = sock.accept()
+                    spawn { => handleConnection(client) }
+                } else {
+                    return
+                }
+            } catch (e: SocketException) {
+                if (!running) {
+                    return
+                }
+                println("[websocket] accept 失败: ${e}")
+            } catch (e: Exception) {
+                if (!running) {
+                    return
+                }
+                println("[websocket] accept 失败: ${e}")
+            }
+        }
+    }
+
+    private func handleConnection(sock: TcpSocket): Unit {
+        let fs = FrameStream(sock, maxPayload, false)
+        try {
+            let request = fs.readHttpHeader()
+            let lines = request.split("\r\n")
+            if (lines.size == 0 || !lines[0].startsWith("GET ")) {
+                reject(sock, 400, "Bad Request")
+                return
+            }
+            let parts = lines[0].split(" ")
+            if (parts.size < 3) {
+                reject(sock, 400, "Bad Request")
+                return
+            }
+            // 拆出路径与 query（如 "/ws/server?serverId=srv-1" → path="/ws/server", query="serverId=srv-1"）
+            let target = parts[1]
+            var requestPath = target
+            var requestQuery = ""
+            if (let Some(qi) <- target.indexOf("?")) {
+                requestPath = target[0..qi]
+                requestQuery = target[qi + 1..]
+            }
+            // 按 WsPath 路由到 handler 工厂，匹配则调用工厂创建新的 handler 实例（每连接一个）
+            let factory = findFactory(requestPath)
+            if (let None <- factory) {
+                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 fac = factory.getOrThrow()
+            let h = fac()
+            let conn = WebSocketConnection(Some(this), h, fs, allocateConnId(), requestPath, requestQuery)
+            addConnection(conn)
+            h.onConnect(conn)
+            conn.runReadLoop()
+        } catch (e: Exception) {
+            // 握手阶段失败：记录日志（连接尚未建立，无 handler 可回调）
+            println("[websocket] 握手失败: ${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 (_) {
+            ()
+        }
+    }
+}