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// Copyright (c) 2015 Mattermost, Inc. All Rights Reserved.
// See License.txt for license information.
package api
import (
l4g "github.com/alecthomas/log4go"
"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
invalidateChannel chan string
}
var hub = &Hub{
register: make(chan *WebConn),
unregister: make(chan *WebConn),
connections: make(map[*WebConn]bool),
broadcast: make(chan *model.WebSocketEvent),
stop: make(chan string),
invalidateUser: make(chan string),
invalidateChannel: make(chan string),
}
func Publish(message *model.WebSocketEvent) {
hub.Broadcast(message)
}
func InvalidateCacheForUser(userId string) {
hub.invalidateUser <- userId
}
func InvalidateCacheForChannel(channelId string) {
hub.invalidateChannel <- channelId
}
func (h *Hub) Register(webConn *WebConn) {
h.register <- webConn
}
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) 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)
}
found := false
for webCon := range h.connections {
if userId == webCon.UserId {
found = true
break
}
}
if !found {
go SetStatusOffline(userId)
}
case userId := <-h.invalidateUser:
for webCon := range h.connections {
if webCon.UserId == userId {
webCon.InvalidateCache()
}
}
case channelId := <-h.invalidateChannel:
for webCon := range h.connections {
webCon.InvalidateCacheForChannel(channelId)
}
case msg := <-h.broadcast:
for webCon := range h.connections {
if shouldSendEvent(webCon, msg) {
select {
case webCon.Send <- msg:
default:
close(webCon.Send)
delete(h.connections, webCon)
}
}
}
case s := <-h.stop:
l4g.Debug(utils.T("api.web_hub.start.stopping.debug"), s)
for webCon := range h.connections {
webCon.WebSocket.Close()
}
return
}
}
}()
}
func shouldSendEvent(webCon *WebConn, msg *model.WebSocketEvent) bool {
if webCon.UserId == msg.UserId {
// Don't need to tell the user they are typing
if msg.Event == model.WEBSOCKET_EVENT_TYPING {
return false
}
// We have to make sure the user is in the channel. Otherwise system messages that
// post about users in channels they are not in trigger warnings.
if len(msg.ChannelId) > 0 {
allowed := webCon.HasPermissionsToChannel(msg.ChannelId)
if !allowed {
return false
}
}
} else {
// Don't share a user's view or preference events with other users
if msg.Event == model.WEBSOCKET_EVENT_CHANNEL_VIEWED {
return false
} else if msg.Event == model.WEBSOCKET_EVENT_PREFERENCE_CHANGED {
return false
} else if msg.Event == model.WEBSOCKET_EVENT_EPHEMERAL_MESSAGE {
// For now, ephemeral messages are sent directly to individual users
return false
}
// Only report events to users who are in the team for the event
if len(msg.TeamId) > 0 {
allowed := webCon.HasPermissionsToTeam(msg.TeamId)
if !allowed {
return false
}
}
// Only report events to users who are in the channel for the event execept deleted events
if len(msg.ChannelId) > 0 && msg.Event != model.WEBSOCKET_EVENT_CHANNEL_DELETED {
allowed := webCon.HasPermissionsToChannel(msg.ChannelId)
if !allowed {
return false
}
}
}
return true
}
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