/
wsserver.go
217 lines (194 loc) · 5.12 KB
/
wsserver.go
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package driver
import (
"io"
"net"
"net/http"
"net/url"
"os"
"strings"
"sync"
"sync/atomic"
"time"
"github.com/RomiChan/websocket"
log "github.com/sirupsen/logrus"
"github.com/tidwall/gjson"
zero "github.com/zhang19523zhao/zh-ZeroBot"
"github.com/zhang19523zhao/zh-ZeroBot/utils/helper"
)
// WSServer ...
type WSServer struct {
Url string // ws连接地址
AccessToken string
lstn net.Listener
caller chan *WSSCaller
}
// NewWebSocketServer 使用反向WS通信
func NewWebSocketServer(waitn int, url, accessToken string) *WSServer {
return &WSServer{
Url: url,
AccessToken: accessToken,
caller: make(chan *WSSCaller, waitn),
}
}
// WSSCaller ...
type WSSCaller struct {
mu sync.Mutex // 写锁
seqMap seqSyncMap
conn *websocket.Conn
selfID int64
seq uint64
}
var upgrader = websocket.Upgrader{
CheckOrigin: func(r *http.Request) bool {
return true
},
}
// Connect 监听ws服务
func (wss *WSServer) Connect() {
network, address := resolveURI(wss.Url)
uri, err := url.Parse(address)
if err == nil && uri.Scheme != "" {
address = uri.Host
}
listener, err := net.Listen(network, address)
if err != nil {
log.Warn("[wss] Websocket服务器监听失败:", err)
wss.lstn = nil
return
}
wss.lstn = listener
log.Infoln("[wss] Websocket服务器开始监听:", listener.Addr())
}
func checkAuth(req *http.Request, token string) int {
if token == "" { // quick path
return http.StatusOK
}
auth := req.Header.Get("Authorization")
if auth == "" {
auth = req.URL.Query().Get("access_token")
} else {
_, after, ok := strings.Cut(auth, " ")
if ok {
auth = after
}
}
switch auth {
case token:
return http.StatusOK
case "":
return http.StatusUnauthorized
default:
return http.StatusForbidden
}
}
func (wss *WSServer) any(w http.ResponseWriter, r *http.Request) {
status := checkAuth(r, wss.AccessToken)
if status != http.StatusOK {
log.Warnf("[wss] 已拒绝 %v 的 WebSocket 请求: Token鉴权失败(code:%d)", r.RemoteAddr, status)
w.WriteHeader(status)
return
}
conn, err := upgrader.Upgrade(w, r, nil)
if err != nil {
log.Warnf("[wss] 处理 WebSocket 请求时出现错误: %v", err)
return
}
var rsp struct {
SelfID int64 `json:"self_id"`
}
err = conn.ReadJSON(&rsp)
if err != nil {
log.Warnf("[wss] 与Websocket服务器 %v 握手时出现错误: %v", wss.Url, err)
return
}
c := &WSSCaller{
conn: conn,
selfID: rsp.SelfID,
}
zero.APICallers.Store(rsp.SelfID, c) // 添加Caller到 APICaller list...
log.Infof("[wss] 连接Websocket服务器: %s 成功, 账号: %d", wss.Url, rsp.SelfID)
wss.caller <- c
}
// Listen 开始监听事件
func (wss *WSServer) Listen(handler func([]byte, zero.APICaller)) {
mux := http.ServeMux{}
mux.HandleFunc("/", wss.any)
go func() {
for {
if wss.lstn == nil {
time.Sleep(time.Millisecond * time.Duration(3))
wss.Connect()
continue
}
log.Infof("[wss] WebSocket 服务器开始处理: %v", wss.lstn.Addr())
err := http.Serve(wss.lstn, &mux)
if err != nil {
log.Warn("[wss] Websocket服务器在端点", wss.lstn.Addr(), "失败:", err)
wss.lstn = nil
}
}
}()
for wssc := range wss.caller {
go wssc.listen(handler)
}
}
func (wssc *WSSCaller) listen(handler func([]byte, zero.APICaller)) {
for {
t, payload, err := wssc.conn.ReadMessage()
if err != nil { // reconnect
zero.APICallers.Delete(wssc.selfID) // 断开从apicaller中删除
log.Warn("[wss] Websocket服务器连接断开...")
return
}
if t != websocket.TextMessage {
continue
}
rsp := gjson.Parse(helper.BytesToString(payload))
if rsp.Get("echo").Exists() { // 存在echo字段,是api调用的返回
log.Debug("[wss] 接收到API调用返回: ", strings.TrimSpace(helper.BytesToString(payload)))
if c, ok := wssc.seqMap.LoadAndDelete(rsp.Get("echo").Uint()); ok {
c <- zero.APIResponse{ // 发送api调用响应
Status: rsp.Get("status").String(),
Data: rsp.Get("data"),
Msg: rsp.Get("msg").Str,
Wording: rsp.Get("wording").Str,
RetCode: rsp.Get("retcode").Int(),
Echo: rsp.Get("echo").Uint(),
}
close(c) // channel only use once
}
} else {
if rsp.Get("meta_event_type").Str != "heartbeat" { // 忽略心跳事件
log.Debug("[wss] 接收到事件: ", helper.BytesToString(payload))
}
handler(payload, wssc)
}
}
}
func (wssc *WSSCaller) nextSeq() uint64 {
return atomic.AddUint64(&wssc.seq, 1)
}
// CallApi 发送ws请求
func (wssc *WSSCaller) CallApi(req zero.APIRequest) (zero.APIResponse, error) {
ch := make(chan zero.APIResponse, 1)
req.Echo = wssc.nextSeq()
wssc.seqMap.Store(req.Echo, ch)
// send message
wssc.mu.Lock() // websocket write is not goroutine safe
err := wssc.conn.WriteJSON(&req)
wssc.mu.Unlock()
if err != nil {
log.Warn("[wss] 向WebsocketServer发送API请求失败: ", err.Error())
return nullResponse, err
}
log.Debug("[wss] 向服务器发送请求: ", &req)
select { // 等待数据返回
case rsp, ok := <-ch:
if !ok {
return nullResponse, io.ErrClosedPipe
}
return rsp, nil
case <-time.After(time.Minute):
return nullResponse, os.ErrDeadlineExceeded
}
}