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427
4G/源代码/lib/websocket.lua
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427
4G/源代码/lib/websocket.lua
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--- 模块功能：websocket客户端
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-- @module websocket
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-- @author wendal
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-- @license MIT
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-- @copyright OpenLuat.com
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-- @release 2023.09.18
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require "utils"
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require "socket"
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module(..., package.seeall)
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local magic = '258EAFA5-E914-47DA-95CA-C5AB0DC85B11'
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local ws = {}
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ws.__index = ws
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local function websocket(url, cert)
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return setmetatable({
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io = nil,
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url = url,
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key = "",
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wss = "",
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cert = cert,
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host = "",
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port = "",
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input = "",
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callbacks = {},
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send_data = {},
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send_text = nil,
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sendsize = 1460,
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open_callback = false,
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connected = false,
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terminated = false,
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readyState = "CONNECTING"
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}, ws)
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end
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--- 创建 websocket 对象
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-- @string url websocket服务器的连接地址,格式为ws(或wss)://xxx开头
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-- @table[opt=nil] cert ssl连接需要的证书配置，cert格式如下：
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-- {
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-- caCert = "ca.crt", --CA证书文件(Base64编码 X.509格式)，如果存在此参数，则表示客户端会对服务器的证书进行校验；不存在则不校验
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-- clientCert = "client.crt", --客户端证书文件(Base64编码 X.509格式)，服务器对客户端的证书进行校验时会用到此参数
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-- clientKey = "client.key", --客户端私钥文件(Base64编码 X.509格式)
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-- clientPassword = "123456", --客户端证书文件密码[可选]
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-- insist = 1, --证书中的域名校验失败时，是否坚持连接，默认为1，坚持连接，0为不连接
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-- }
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-- @return table 返回1个websocket对象
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-- @usage local ws = websocket.new("ws://121.40.165.18:8800")
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function new(url, cert)
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return websocket(url, cert)
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end
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--- ws:on 注册函数
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-- @string event 事件，可选值"open","message","close","error","pong"
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-- @function callback 回调方法，message|error|pong形参是该方法需要的数据。
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-- @usage mt:on("message",function(message) local print(message)end)
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function ws:on(event, callback)
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self.callbacks[event] = callback
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end
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--- websocket 与 websocket 服务器建立连接
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-- @number timeout 与websocket服务器建立连接最长超时
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-- @return bool,true,表示连接成功,false or nil 表示连接失败
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-- @usage while not ws:connect(20000) do sys.wait(2000) end
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function ws:connect(timeout)
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self.wss, self.host, self.port, self.path = self.url:match("(%a+)://([%w%.%-]+):?(%d*)(.*)")
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self.wss, self.host = self.wss:lower(), self.host:lower()
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self.port = self.port ~= "" and self.port or (self.wss == "wss" and 443 or 80)
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if self.wss == "wss" then
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self.io = socket.tcp(true, self.cert)
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else
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self.io = socket.tcp()
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end
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if not self.io then
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log.error("websocket:connect:", "没有可用的TCP通道!")
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return false
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end
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log.info("websocket url:", self.url)
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if not self.io:connect(self.host, self.port, timeout) then
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log.error("websocket:connect", "服务器连接失败!")
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return false
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end
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self.key = crypto.base64_encode(math.random(100000000000000, 999999999999999) .. 0, 16)
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local req = "GET " .. self.path .. " HTTP/1.1\r\nHost: " .. self.host .. ":" .. self.port .. "\r\nConnection: Upgrade\r\nUpgrade: websocket\r\n" .. "Origin: http://" .. self.host ..
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"\r\nSec-WebSocket-Version: 13\r\n" .. "Sec-WebSocket-Key: " .. self.key .. "\r\n\r\n"
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if self.io:send(req, tonumber(timeout) or 20000) then
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local r, s = self.io:recv(tonumber(timeout) or 5000)
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if not r then
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self.io:close()
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log.error("websocket:connect", "与 websocket server 握手超时!")
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return false
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end
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local _, idx, code = s:find("%s(%d+)%s.-\r\n")
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if code == "101" then
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local header, accept = {}, self.key .. magic
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accept = crypto.sha1(accept, #accept):fromHex()
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accept = crypto.base64_encode(accept, #accept)
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for k, v in string.gmatch(s:sub(idx + 1, -1), "(.-):%s*(.-)\r\n") do
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header[k:lower()] = v
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end
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if header["sec-websocket-accept"] and header["sec-websocket-accept"] == accept then
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log.info("websocket:connect", "与 websocket server 握手成功!")
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self.connected, self.readyState = true, "OPEN"
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if self.callbacks.open then
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self.open_callback = true
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end
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return true
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end
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end
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end
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log.error("websocket:connect", "与 websocket server 握手失败!")
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return false
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end
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-- 掩码加密
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-- mask: 4位长度掩码字符串
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-- data: 待加密的字符串
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-- return: 掩码加密后的字符串
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local function wsmask(mask, data)
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local i = 0
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return data:gsub(".", function(c)
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i = i + 1
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return string.char(bit.bxor(data:byte(i), mask:byte((i - 1) % 4 + 1)))
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end)
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end
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--- websocket发送帧方法
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-- @bool fin true表示结束帧,false表示延续帧
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-- @number opcode 0x0--0xF,其他值非法,代码意义参考websocket手册
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-- @string data 用户要发送的数据
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-- @usage self:sendFrame(true, 0x1, "www.openluat.com")
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function ws:sendFrame(fin, opcode, data)
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if not self.connected then
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return
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end
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local finbit, maskbit, len = fin and 0x80 or 0, 0x80, #data
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local frame = pack.pack("b", bit.bor(finbit, opcode))
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if len < 126 then
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frame = frame .. pack.pack("b", bit.bor(len, maskbit))
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elseif len < 0xFFFF then
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frame = frame .. pack.pack(">bH", bit.bor(126, maskbit), len)
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else
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-- frame = frame .. pack.pack(">BL", bit.bor(127, maskbit), len)
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log.error("ws:sendFrame", "数据长度超过最大值!")
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return
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end
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local mask = pack.pack(">I", os.time())
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frame = frame .. mask .. wsmask(mask, data)
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for i = 1, #frame, self.sendsize do
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if not self.io:send(frame:sub(i, i + self.sendsize - 1)) then
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break
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end
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end
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return true
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end
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-- websocket 发送用户数据方法
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-- @string data: 用户要发送的字符串数据
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-- @bool text: true 数据为文本字符串,nil或false数据为二进制数据。
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-- @usage self:send("www.openluat.com")
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-- @usage self:send("www.openluat.com",true)
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-- @usage self:send(string.fromHex("www.openluat.com"))
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local function send(ws, data, text)
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if text then
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log.info("websocket cleint send:", data:sub(1, 100))
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ws:sendFrame(true, 0x1, data)
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else
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ws:sendFrame(true, 0x2, data)
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end
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if ws.callbacks.sent then
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ws.callbacks.sent()
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end
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end
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-- websocket发送数据包
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-- @usage self:send(data, is_text)
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function ws:send(data, text)
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table.insert(self.send_data, {data, text})
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sys.publish("WEBSOCKET_SEND_DATA", "send")
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end
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local function ping(ws)
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ws:sendFrame(true, 0x9, "")
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end
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local function pong(ws, data)
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ws:sendFrame(true, 0xA, data or "")
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end
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-- websocket发送ping包(已废弃)
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-- @usage self:ping()
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function ws:ping() end
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-- websocket发送pong包(已废弃)
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-- @usage self:pong()
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function ws:pong() end
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local function uplink(ws)
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while #ws.send_data > 0 do
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local tmp = {}
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for _, v in ipairs(ws.send_data) do
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table.insert(tmp, v)
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end
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ws.send_data = {}
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for _, v in ipairs(tmp) do
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send(ws, v[1], v[2])
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end
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end
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end
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-- 处理 websocket 发过来的数据并解析帧数据
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-- @return string : 返回解析后的单帧用户数据
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function ws:recvFrame()
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uplink(self) -- 有没有待上传数据, 有就全部上报
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local close_ctrl = "EXIT_TASK" .. self.io.id
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local r, s, p = self.io:recv(5000, "WEBSOCKET_SEND_DATA")
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if not r then
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if s == "timeout" then
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return false, nil, "WEBSOCKET_OK"
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elseif s == "WEBSOCKET_SEND_DATA" then
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if p == "send" then -- 主动上报
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uplink(self)
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elseif p == "ping" then -- 本地心跳上行
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ping(self, "")
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elseif p == "pong" then -- 服务器心跳下行,马上回应
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pong(self, "")
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elseif p == close_ctrl then
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return false, nil, close_ctrl
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end
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return false, nil, "WEBSOCKET_OK"
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else
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return false, nil, "Read byte error!"
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end
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end
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if #self.input ~= 0 then
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s = self.input .. s
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end
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local _, firstByte, secondByte = pack.unpack(s:sub(1, 2), "bb")
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local fin = bit.band(firstByte, 0x80) ~= 0
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local rsv = bit.band(firstByte, 0x70) ~= 0
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local opcode = bit.band(firstByte, 0x0f)
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local isControl = bit.band(opcode, 0x08) ~= 0
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-- 检查RSV1,RSV2,RSV3 是否为0,客户端不支持扩展
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if rsv then
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return false, nil, "服务器正在使用未定义的扩展!"
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end
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-- 检查数据是否存在掩码加密
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local maskbit = bit.band(secondByte, 0x80) ~= 0
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local length = bit.band(secondByte, 0x7f)
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if isControl and (length >= 126 or not fin) then
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return false, nil, "控制帧异常!"
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end
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if maskbit then
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return false, nil, "数据帧被掩码处理过!"
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end
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-- 获取载荷长度
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if length == 126 then
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-- if not r then return false, nil, "读取帧载荷长度失败!" end
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_, length = pack.unpack(s:sub(3, 4), ">H")
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elseif length == 127 then
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return false, nil, "数据帧长度超过支持范围!"
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end
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-- 获取有效载荷数据
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if length > 0 then
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-- TODO 支持大于64的包
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-- log.info("teste", #s, length)
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if length > 126 then
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-- r, s = self.io:recv()
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if #s < length + 4 then
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self.input = s
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return true, false, ""
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end
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s = s:sub(5, 5 + length - 1)
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else
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s = s:sub(3, 3 + length - 1)
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end
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-- log.info("s的长度", #s, length)
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-- if not r then return false, nil, "读取帧有效载荷数据失败!" end
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end
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-- 处理切片帧
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if not fin then -- 切片未完成
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return true, false, s
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else -- 未分片帧
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if opcode < 0x3 then -- 数据帧
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self.input = ""
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return true, true, s
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elseif opcode == 0x8 then -- close
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local code, reason
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if #s >= 2 then
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_, code = pack.unpack(s:sub(1, 2), ">H")
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end
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if #s > 2 then
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reason = s:sub(3)
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end
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self.terminated = true
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-- self:close(code, reason)
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self.input = ""
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return false, nil, reason
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elseif opcode == 0x9 then -- Ping
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pong(self, s or "")
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elseif opcode == 0xA then -- Pong
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if self.callbacks.pong then
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self.callbacks.pong(s)
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end
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end
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self.input = ""
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return true, true, nil
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end
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end
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--- 处理 websocket 发过来的数据并拼包
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-- @return result, boolean: 返回数据的状态 true 为正常, false 为失败
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-- @return data, string: result为true时为数据,false时为报错信息
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-- @usage local result, data = ws:recv()
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function ws:recv()
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local data = ""
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while true do
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local success, final, message = self:recvFrame()
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-- 数据帧解析错误
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if not success then
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return success, message
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end
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-- 数据帧分片处理
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if message then
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data = data .. message
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else
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data = "" -- 数据帧包含控制帧处理
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end
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-- 数据帧处理完成
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if final and message then
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break
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end
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end
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if self.callbacks.message then
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self.callbacks.message(data)
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end
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return true, data
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end
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--- 关闭 websocket 与服务器的链接
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-- @number code 1000或1002等,请参考websocket标准
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-- @string reason 关闭原因
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-- @return nil
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-- @usage ws:close()
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-- @usage ws:close(1002,"协议错误")
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function ws:close(code, reason)
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-- 1000 "normal closure" status code
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self.readyState = "CLOSING"
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if self.terminated then
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log.error("ws:close server code:", code, reason)
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elseif self.io.connected then
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if code == nil and reason ~= nil then
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code = 1000
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end
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local data = ""
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if code ~= nil then
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data = pack.pack(">H", code)
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end
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if reason ~= nil then
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data = data .. reason
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end
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self.terminated = true
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self:sendFrame(true, 0x8, data)
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end
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self.io:close()
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self.readyState, self.connected = "CLOSED", false
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if self.callbacks.close then
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self.callbacks.close(code or 1001)
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end
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self.input = ""
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end
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--- 主动退出一个指定的websocket任务
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-- @传入一个websocket对象
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-- @return nil
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-- @usage wesocket.exit(ws)
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function exit(ws)
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sys.publish("WEBSOCKET_SEND_DATA", "EXIT_TASK" .. ws.io.id)
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end
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--- 获取websocket当前状态
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-- @return string,状态值("CONNECTING","OPEN","CLOSING","CLOSED")
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-- @usage ws:state()
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function ws:state()
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return self.readyState
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end
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--- 获取websocket与服务器连接状态
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-- @return boolean: true 连接成功,其他值连接失败
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-- @usage ws:online()
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function ws:online()
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return self.connected
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end
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--- websocket 需要在任务中启动,带自动重连,支持心跳协议
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-- @number[opt=nil] keepAlive websocket心跳包，建议30秒
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-- @function[opt=nil] proc 处理服务器下发消息的函数
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-- @number[opt=1000] reconnTime 断开链接后的重连时间
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-- @return nil
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-- @usage sys.taskInit(ws.start,ws,30)
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-- @usage sys.taskInit(ws.start,ws,30,function(msg)u1:send(msg) end)
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function ws:start(keepAlive, proc, reconnTime)
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reconnTime = tonumber(reconnTime) and reconnTime * 1000 or 1000
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keepAlivetimer = sys.timerLoopStart(self.ping, 30000, self)
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while true do
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while not socket.isReady() do
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sys.wait(1000)
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end
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if self:connect() then
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if self.open_callback == true then
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self.callbacks.open()
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self.open_callback = false
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end
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local close_ctrl = "EXIT_TASK" .. self.io.id
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repeat
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local r, message = self:recv()
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if r then
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if type(proc) == "function" then
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proc(message)
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end
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elseif message == close_ctrl then
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self:close()
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sys.timerStop(keepAlivetimer)
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if self.io.id ~= nil then
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self = nil
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end
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return true
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elseif not r and message ~= "WEBSOCKET_OK" then
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log.error('ws recv error', message)
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end
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until not r and message ~= "WEBSOCKET_OK"
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end
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self:close()
|
||||
log.info("websocket:Start", "与 websocket Server 的连接已断开!")
|
||||
sys.wait(reconnTime)
|
||||
end
|
||||
end
|
||||
|
||||
Reference in New Issue
Block a user