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// Copyright (c) 2015 Mattermost, Inc. All Rights Reserved.
// See License.txt for license information.
package app
import (
"fmt"
"hash/fnv"
"runtime"
l4g "github.com/alecthomas/log4go"
"github.com/mattermost/platform/einterfaces"
"github.com/mattermost/platform/model"
"github.com/mattermost/platform/utils"
)
type Hub struct {
connections map[*WebConn]bool
register chan *WebConn
unregister chan *WebConn
broadcast chan *model.WebSocketEvent
stop chan string
invalidateUser chan string
}
var hubs []*Hub = make([]*Hub, 0)
func NewWebHub() *Hub {
return &Hub{
register: make(chan *WebConn),
unregister: make(chan *WebConn),
connections: make(map[*WebConn]bool, model.SESSION_CACHE_SIZE),
broadcast: make(chan *model.WebSocketEvent, 4096),
stop: make(chan string),
invalidateUser: make(chan string),
}
}
func TotalWebsocketConnections() int {
// This is racy, but it's only used for reporting information
// so it's probably OK
count := 0
for _, hub := range hubs {
count = count + len(hub.connections)
}
return count
}
func HubStart() {
l4g.Info(utils.T("api.web_hub.start.starting.debug"), runtime.NumCPU()*2)
// Total number of hubs is twice the number of CPUs.
hubs = make([]*Hub, runtime.NumCPU()*2)
for i := 0; i < len(hubs); i++ {
hubs[i] = NewWebHub()
hubs[i].Start()
}
}
func HubStop() {
l4g.Info(utils.T("api.web_hub.start.stopping.debug"))
for _, hub := range hubs {
hub.Stop()
}
hubs = make([]*Hub, 0)
}
func GetHubForUserId(userId string) *Hub {
hash := fnv.New32a()
hash.Write([]byte(userId))
index := hash.Sum32() % uint32(len(hubs))
return hubs[index]
}
func HubRegister(webConn *WebConn) {
GetHubForUserId(webConn.UserId).Register(webConn)
}
func HubUnregister(webConn *WebConn) {
GetHubForUserId(webConn.UserId).Unregister(webConn)
}
func Publish(message *model.WebSocketEvent) {
message.DoPreComputeJson()
for _, hub := range hubs {
hub.Broadcast(message)
}
if einterfaces.GetClusterInterface() != nil {
einterfaces.GetClusterInterface().Publish(message)
}
}
func PublishSkipClusterSend(message *model.WebSocketEvent) {
message.DoPreComputeJson()
for _, hub := range hubs {
hub.Broadcast(message)
}
}
func InvalidateCacheForChannel(channelId string) {
InvalidateCacheForChannelSkipClusterSend(channelId)
if cluster := einterfaces.GetClusterInterface(); cluster != nil {
cluster.InvalidateCacheForChannel(channelId)
}
}
func InvalidateCacheForChannelSkipClusterSend(channelId string) {
Srv.Store.User().InvalidateProfilesInChannelCache(channelId)
Srv.Store.Channel().InvalidateMemberCount(channelId)
Srv.Store.Channel().InvalidateChannel(channelId)
}
func InvalidateCacheForChannelPosts(channelId string) {
InvalidateCacheForChannelPostsSkipClusterSend(channelId)
if cluster := einterfaces.GetClusterInterface(); cluster != nil {
cluster.InvalidateCacheForChannelPosts(channelId)
}
}
func InvalidateCacheForChannelPostsSkipClusterSend(channelId string) {
Srv.Store.Post().InvalidateLastPostTimeCache(channelId)
}
func InvalidateCacheForUser(userId string) {
InvalidateCacheForUserSkipClusterSend(userId)
if einterfaces.GetClusterInterface() != nil {
einterfaces.GetClusterInterface().InvalidateCacheForUser(userId)
}
}
func InvalidateCacheForUserSkipClusterSend(userId string) {
Srv.Store.Channel().InvalidateAllChannelMembersForUser(userId)
Srv.Store.User().InvalidateProfilesInChannelCacheByUser(userId)
Srv.Store.User().InvalidatProfileCacheForUser(userId)
if len(hubs) != 0 {
GetHubForUserId(userId).InvalidateUser(userId)
}
}
func InvalidateWebConnSessionCacheForUser(userId string) {
if len(hubs) != 0 {
GetHubForUserId(userId).InvalidateUser(userId)
}
}
func (h *Hub) Register(webConn *WebConn) {
h.register <- webConn
if webConn.IsAuthenticated() {
webConn.SendHello()
}
}
func (h *Hub) Unregister(webConn *WebConn) {
h.unregister <- webConn
}
func (h *Hub) Broadcast(message *model.WebSocketEvent) {
if message != nil {
h.broadcast <- message
}
}
func (h *Hub) InvalidateUser(userId string) {
h.invalidateUser <- userId
}
func (h *Hub) Stop() {
h.stop <- "all"
}
func (h *Hub) Start() {
go func() {
for {
select {
case webCon := <-h.register:
h.connections[webCon] = true
case webCon := <-h.unregister:
userId := webCon.UserId
if _, ok := h.connections[webCon]; ok {
delete(h.connections, webCon)
close(webCon.Send)
}
if len(userId) == 0 {
continue
}
found := false
for webCon := range h.connections {
if userId == webCon.UserId {
found = true
break
}
}
if !found {
go SetStatusOffline(userId, false)
}
case userId := <-h.invalidateUser:
for webCon := range h.connections {
if webCon.UserId == userId {
webCon.InvalidateCache()
}
}
case msg := <-h.broadcast:
for webCon := range h.connections {
if webCon.ShouldSendEvent(msg) {
select {
case webCon.Send <- msg:
default:
l4g.Error(fmt.Sprintf("webhub.broadcast: cannot send, closing websocket for userId=%v", webCon.UserId))
close(webCon.Send)
delete(h.connections, webCon)
}
}
}
case <-h.stop:
for webCon := range h.connections {
webCon.WebSocket.Close()
}
return
}
}
}()
}
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