445 lines
12 KiB
Go
445 lines
12 KiB
Go
// +build !no_ws
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/*
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*
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* Gosora WebSocket Subsystem
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* Copyright Azareal 2017 - 2020
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*
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*/
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package common
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import (
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"bytes"
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"errors"
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"fmt"
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"net/http"
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"runtime"
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"strconv"
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"strings"
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"sync"
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"time"
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p "github.com/Azareal/Gosora/common/phrases"
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"github.com/Azareal/gopsutil/cpu"
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"github.com/Azareal/gopsutil/mem"
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"github.com/gorilla/websocket"
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)
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// TODO: Disable WebSockets on high load? Add a Control Panel interface for disabling it?
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var EnableWebsockets = true // Put this in caps for consistency with the other constants?
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var wsUpgrader = websocket.Upgrader{ReadBufferSize: 1024, WriteBufferSize: 1024}
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var errWsNouser = errors.New("This user isn't connected via WebSockets")
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func init() {
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adminStatsWatchers = make(map[*websocket.Conn]*WSUser)
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topicListWatchers = make(map[*WSUser]struct{})
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topicWatchers = make(map[int]map[*WSUser]struct{})
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}
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//easyjson:json
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type WsTopicList struct {
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Topics []*WsTopicsRow
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LastPage int // Not for WebSockets, but for the JSON endpoint for /topics/ to keep the paginator functional
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LastUpdate int64
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}
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// TODO: How should we handle errors for this?
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// TODO: Move this out of common?
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func RouteWebsockets(w http.ResponseWriter, r *http.Request, user User) RouteError {
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// TODO: Spit out a 500 instead of nil?
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conn, err := wsUpgrader.Upgrade(w, r, nil)
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if err != nil {
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return LocalError("unable to upgrade", w, r, user)
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}
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defer conn.Close()
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wsUser, err := WsHub.AddConn(user, conn)
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if err != nil {
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return nil
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}
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//conn.SetReadLimit(/* put the max request size from earlier here? */)
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//conn.SetReadDeadline(time.Now().Add(60 * time.Second))
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var currentPage string
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for {
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_, message, err := conn.ReadMessage()
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if err != nil {
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if user.ID == 0 {
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WsHub.GuestLock.Lock()
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delete(WsHub.OnlineGuests, wsUser)
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WsHub.GuestLock.Unlock()
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} else {
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// TODO: Make sure the admin is removed from the admin stats list in the case that an error happens
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WsHub.RemoveConn(wsUser, conn)
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}
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break
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}
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if conn == nil {
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panic("conn must not be nil")
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}
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for _, msg := range bytes.Split(message, []byte("\r")) {
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//StoppedServer("Profile end") // A bit of code for me to profile the software
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if bytes.HasPrefix(msg, []byte("page ")) {
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msgblocks := bytes.SplitN(msg, []byte(" "), 2)
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if len(msgblocks) < 2 {
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continue
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}
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if !bytes.Equal(msgblocks[1], []byte(currentPage)) {
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wsLeavePage(wsUser, conn, currentPage)
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currentPage = string(msgblocks[1])
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wsPageResponses(wsUser, conn, currentPage)
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}
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} else if bytes.HasPrefix(msg, []byte("resume ")) {
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msgblocks := bytes.SplitN(msg, []byte(" "), 3)
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if len(msgblocks) < 3 {
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continue
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}
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//log.Print("resuming on " + string(msgblocks[1]) + " at " + string(msgblocks[2]))
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if !bytes.Equal(msgblocks[1], []byte(currentPage)) {
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wsLeavePage(wsUser, conn, currentPage) // Avoid clients abusing late resumes
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currentPage = string(msgblocks[1])
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// TODO: Synchronise this better?
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resume, err := strconv.ParseInt(string(msgblocks[2]), 10, 64)
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wsPageResponses(wsUser, conn, currentPage)
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if err != nil {
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wsPageResume(wsUser, conn, currentPage, resume)
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}
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}
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}
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/*if bytes.Equal(message,[]byte(`start-view`)) {
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} else if bytes.Equal(message,[]byte(`end-view`)) {
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}*/
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}
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}
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DebugLog("Closing connection for user " + strconv.Itoa(user.ID))
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return nil
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}
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// TODO: Copied from routes package for use in wsPageResponse, find a more elegant solution.
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func ParseSEOURL(urlBit string) (slug string, id int, err error) {
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halves := strings.Split(urlBit, ".")
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if len(halves) < 2 {
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halves = append(halves, halves[0])
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}
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tid, err := strconv.Atoi(halves[1])
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return halves[0], tid, err
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}
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// TODO: Use a map instead of a switch to make this more modular?
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func wsPageResponses(wsUser *WSUser, conn *websocket.Conn, page string) {
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if page == "/" {
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page = Config.DefaultPath
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}
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DebugLog("Entering page " + page)
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switch {
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// Live Topic List is an experimental feature
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// TODO: Optimise this to reduce the amount of contention
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case page == "/topics/":
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topicListMutex.Lock()
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topicListWatchers[wsUser] = struct{}{}
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topicListMutex.Unlock()
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// TODO: Evict from page when permissions change? Or check user perms every-time before sending data?
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case strings.HasPrefix(page, "/topic/"):
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//fmt.Println("entering topic prefix websockets zone")
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if wsUser.User.ID == 0 {
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return
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}
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_, tid, err := ParseSEOURL(page)
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if err != nil {
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return
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}
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topic, err := Topics.Get(tid)
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if err != nil {
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return
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}
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if !Forums.Exists(topic.ParentID) {
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return
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}
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var usercpy *User = BlankUser()
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*usercpy = *wsUser.User
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usercpy.Init()
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/*skip, rerr := header.Hooks.VhookSkippable("ws_topic_check_pre_perms", w, r, usercpy, &fid, &header)
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if skip || rerr != nil {
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return
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}*/
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fperms, err := FPStore.Get(topic.ParentID, usercpy.Group)
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if err == ErrNoRows {
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fperms = BlankForumPerms()
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} else if err != nil {
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return
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}
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cascadeForumPerms(fperms, usercpy)
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if !usercpy.Perms.ViewTopic {
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return
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}
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topicMutex.Lock()
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_, ok := topicWatchers[topic.ID]
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if !ok {
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topicWatchers[topic.ID] = make(map[*WSUser]struct{})
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}
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topicWatchers[topic.ID][wsUser] = struct{}{}
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topicMutex.Unlock()
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case page == "/panel/":
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if !wsUser.User.IsSuperMod {
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return
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}
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// Listen for changes and inform the admins...
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adminStatsMutex.Lock()
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watchers := len(adminStatsWatchers)
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adminStatsWatchers[conn] = wsUser
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if watchers == 0 {
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go adminStatsTicker()
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}
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adminStatsMutex.Unlock()
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default:
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return
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}
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err := wsUser.SetPageForSocket(conn, page)
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if err != nil {
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LogError(err)
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}
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}
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// TODO: Use a map instead of a switch to make this more modular?
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// TODO: Implement this
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func wsPageResume(wsUser *WSUser, conn *websocket.Conn, page string, resume int64) {
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if page == "/" {
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page = Config.DefaultPath
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}
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switch {
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// TODO: Synchronise this bit of resume with tick updating lastTopicList?
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case page == "/topics/":
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/*if resume >= hub.lastTick.Unix() {
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conn.Write([]byte("resume tooslow"))
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} else {
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conn.Write([]byte("resume success"))
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}*/
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default:
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return
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}
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}
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// TODO: Use a map instead of a switch to make this more modular?
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func wsLeavePage(wsUser *WSUser, conn *websocket.Conn, page string) {
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if page == "/" {
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page = Config.DefaultPath
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} else if page != "" {
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DebugLog("Leaving page " + page)
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}
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switch {
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case page == "/topics/":
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wsUser.FinalizePage("/topics/", func() {
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topicListMutex.Lock()
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delete(topicListWatchers, wsUser)
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topicListMutex.Unlock()
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})
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case strings.HasPrefix(page, "/topic/"):
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//fmt.Println("leaving topic prefix websockets zone")
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if wsUser.User.ID == 0 {
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return
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}
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wsUser.FinalizePage(page, func() {
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_, tid, err := ParseSEOURL(page)
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if err != nil {
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return
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}
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topicMutex.Lock()
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defer topicMutex.Unlock()
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topic, ok := topicWatchers[tid]
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if !ok {
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return
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}
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_, ok = topic[wsUser]
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if !ok {
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return
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}
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delete(topic, wsUser)
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if len(topic) == 0 {
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delete(topicWatchers, tid)
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}
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})
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case page == "/panel/":
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adminStatsMutex.Lock()
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delete(adminStatsWatchers, conn)
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adminStatsMutex.Unlock()
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}
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err := wsUser.SetPageForSocket(conn, "")
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if err != nil {
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LogError(err)
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}
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}
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// TODO: Abstract this
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// TODO: Use odd-even sharding
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var topicListWatchers map[*WSUser]struct{}
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var topicListMutex sync.RWMutex
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var topicWatchers map[int]map[*WSUser]struct{} // map[tid]watchers
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var topicMutex sync.RWMutex
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var adminStatsWatchers map[*websocket.Conn]*WSUser
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var adminStatsMutex sync.RWMutex
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func adminStatsTicker() {
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time.Sleep(time.Second)
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lastUonline := -1
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lastGonline := -1
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lastTotonline := -1
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lastCPUPerc := -1
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var lastAvailableRAM int64 = -1
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var noStatUpdates, noRAMUpdates bool
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var onlineColour, onlineGuestsColour, onlineUsersColour, cpustr, cpuColour, ramstr, ramColour string
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var cpuerr, ramerr error
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var memres *mem.VirtualMemoryStat
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var cpuPerc []float64
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var totunit, uunit, gunit string
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lessThanSwitch := func(number int, lowerBound int, midBound int) string {
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switch {
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case number < lowerBound:
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return "stat_green"
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case number < midBound:
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return "stat_orange"
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}
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return "stat_red"
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}
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greaterThanSwitch := func(number int, lowerBound int, midBound int) string {
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switch {
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case number > midBound:
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return "stat_green"
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case number > lowerBound:
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return "stat_orange"
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}
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return "stat_red"
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}
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AdminStatLoop:
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for {
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adminStatsMutex.RLock()
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watchCount := len(adminStatsWatchers)
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adminStatsMutex.RUnlock()
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if watchCount == 0 {
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break AdminStatLoop
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}
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cpuPerc, cpuerr = cpu.Percent(time.Second, true)
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memres, ramerr = mem.VirtualMemory()
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uonline := WsHub.UserCount()
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gonline := WsHub.GuestCount()
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totonline := uonline + gonline
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reqCount := 0
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// It's far more likely that the CPU Usage will change than the other stats, so we'll optimise them separately...
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noStatUpdates = (uonline == lastUonline && gonline == lastGonline && totonline == lastTotonline)
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noRAMUpdates = (lastAvailableRAM == int64(memres.Available))
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if int(cpuPerc[0]) == lastCPUPerc && noStatUpdates && noRAMUpdates {
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time.Sleep(time.Second)
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continue
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}
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if !noStatUpdates {
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onlineColour = greaterThanSwitch(totonline, 3, 10)
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onlineGuestsColour = greaterThanSwitch(gonline, 1, 10)
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onlineUsersColour = greaterThanSwitch(uonline, 1, 5)
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totonline, totunit = ConvertFriendlyUnit(totonline)
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uonline, uunit = ConvertFriendlyUnit(uonline)
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gonline, gunit = ConvertFriendlyUnit(gonline)
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}
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if cpuerr != nil {
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cpustr = "Unknown"
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} else {
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calcperc := int(cpuPerc[0]) / runtime.NumCPU()
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cpustr = strconv.Itoa(calcperc)
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switch {
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case calcperc < 30:
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cpuColour = "stat_green"
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case calcperc < 75:
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cpuColour = "stat_orange"
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default:
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cpuColour = "stat_red"
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}
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}
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if !noRAMUpdates {
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if ramerr != nil {
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ramstr = "Unknown"
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} else {
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totalCount, totalUnit := ConvertByteUnit(float64(memres.Total))
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usedCount := ConvertByteInUnit(float64(memres.Total-memres.Available), totalUnit)
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// Round totals with .9s up, it's how most people see it anyway. Floats are notoriously imprecise, so do it off 0.85
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var totstr string
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if (totalCount - float64(int(totalCount))) > 0.85 {
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usedCount += 1.0 - (totalCount - float64(int(totalCount)))
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totstr = strconv.Itoa(int(totalCount) + 1)
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} else {
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totstr = fmt.Sprintf("%.1f", totalCount)
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}
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if usedCount > totalCount {
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usedCount = totalCount
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}
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ramstr = fmt.Sprintf("%.1f", usedCount) + " / " + totstr + totalUnit
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ramperc := ((memres.Total - memres.Available) * 100) / memres.Total
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ramColour = lessThanSwitch(int(ramperc), 50, 75)
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}
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}
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// Acquire a write lock for now, so we can handle the delete() case below and the read one simultaneously
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// TODO: Stop taking a write lock here if it isn't necessary
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adminStatsMutex.Lock()
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for conn := range adminStatsWatchers {
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w, err := conn.NextWriter(websocket.TextMessage)
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if err != nil {
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delete(adminStatsWatchers, conn)
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continue
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}
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// nolint
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// TODO: Use JSON for this to make things more portable and easier to convert to MessagePack, if need be?
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if !noStatUpdates {
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w.Write([]byte("set #dash-totonline <span>" + p.GetTmplPhrasef("panel_dashboard_online", totonline, totunit) + "</span>\r"))
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w.Write([]byte("set #dash-gonline <span>" + p.GetTmplPhrasef("panel_dashboard_guests_online", gonline, gunit) + "</span>\r"))
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w.Write([]byte("set #dash-uonline <span>" + p.GetTmplPhrasef("panel_dashboard_users_online", uonline, uunit) + "</span>\r"))
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w.Write([]byte("set #dash-reqs <span>" + strconv.Itoa(reqCount) + " reqs / second</span>\r"))
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w.Write([]byte("set-class #dash-totonline grid_item grid_stat " + onlineColour + "\r"))
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w.Write([]byte("set-class #dash-gonline grid_item grid_stat " + onlineGuestsColour + "\r"))
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w.Write([]byte("set-class #dash-uonline grid_item grid_stat " + onlineUsersColour + "\r"))
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//w.Write([]byte("set-class #dash-reqs grid_item grid_stat grid_end_group \r"))
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}
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w.Write([]byte("set #dash-cpu <span>" + p.GetTmplPhrasef("panel_dashboard_cpu",cpustr) + "%</span>\r"))
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w.Write([]byte("set-class #dash-cpu grid_item grid_istat " + cpuColour + "\r"))
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if !noRAMUpdates {
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w.Write([]byte("set #dash-ram <span>" + p.GetTmplPhrasef("panel_dashboard_ram",ramstr) + "</span>\r"))
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w.Write([]byte("set-class #dash-ram grid_item grid_istat " + ramColour + "\r"))
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}
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w.Close()
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}
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adminStatsMutex.Unlock()
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lastUonline = uonline
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lastGonline = gonline
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lastTotonline = totonline
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lastCPUPerc = int(cpuPerc[0])
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lastAvailableRAM = int64(memres.Available)
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}
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}
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