Merging performance branch into master (#4268)

* improve performance on sendNotifications

* Fix SQL queries

* Remove get direct profiles, not needed anymore

* Add raw data to error details if AppError fails to decode

* men

* Fix decode (#4052)

* Fixing json decode

* Adding unit test

* Initial work for client scaling (#4051)

* Begin adding paging to profiles API

* Added more paging functionality

* Finish hooking up admin console user lists

* Add API for searching users and add searching to all user lists

* Add lazy loading of profiles

* Revert config.json

* Fix unit tests and some style issues

* Add GetProfilesFromList to Go driver and fix web unit test

* Update etag for GetProfiles

* Updating ui for filters and pagination (#4044)

* Updating UI for pagination

* Adjusting margins for filter row

* Adjusting margin for specific modals

* Adding relative padding to system console

* Adjusting responsive view

* Update client user tests

* Minor fixes for direct messages modal (#4056)

* Remove some unneeded initial load calls (#4057)

* UX updates to user lists, added smart counts and bug fixes (#4059)

* Improved getExplicitMentions and unit tests (#4064)

* Refactor getting posts to lazy load profiles correctly (#4062)

* Comment out SetActiveChannel test (#4066)

* Profiler cpu, block, and memory profiler. (#4081)

* Fix TestSetActiveChannel unit test (#4071)

* Fixing build failure caused by dependancies updating (#4076)

* Adding profiler

* Fix admin_team_member_dropdown eslint errors

* Bumping session cache size (#4077)

* Bumping session cache size

* Bumping status cache

* Refactor how the client handles channel members to be large team friendly (#4106)

* Refactor how the client handles channel members to be large team friendly

* Change Id to ChannelId in ChannelStats model

* Updated getChannelMember and getProfilesByIds routes to match proposal

* Performance improvements (#4100)

* Performance improvements

* Fixing re-connect issue

* Fixing error message

* Some other minor perf tweaks

* Some other minor perf tweaks

* Fixing config file

* Fixing buffer size

* Fixing web socket send message

* adding some error logging

* fix getMe to be user required

* Fix websocket event for new user

* Fixing shutting down

* Reverting web socket changes

* Fixing logging lvl

* Adding caching to GetMember

* Adding some logging

* Fixing caching

* Fixing caching invalidate

* Fixing direct message caching

* Fixing caching

* Fixing caching

* Remove GetDirectProfiles from initial load

* Adding logging and fixing websocket client

* Adding back caching from bad merge.

* Explicitly close go driver requests (#4162)

* Refactored how the client handles team members to be more large team friendly (#4159)

* Refactor getProfilesForDirectMessageList API into getAllProfiles API

* Refactored how the client handles team members to be more large team friendly

* Fix js error when receiving a notification

* Fix JS error caused by current user being overwritten with sanitized version (#4165)

* Adding error message to status failure (#4167)

* Fix a few bugs caused by client scaling refactoring (#4170)

* When there is no read replica, don't open a second set of connections to the master database (#4173)

* Adding connection tacking to stats (#4174)

* Reduce DB writes for statuses and other status related changes (#4175)

* Fix bug preventing opening of DM channels from more modal (#4181)

* 	Fixing socket timing error (#4183)

* Fixing ping/pong handler

* Fixing socket timing error

* Commenting out status broadcasting

* Removing user status changes

* Removing user status changes

* Removing user status changes

* Removing user status changes

* Adding DoPreComputeJson()

* Performance improvements (#4194)

* * Fix System Console Analytics queries
* Add db.SetConnMaxLifetime to 15 minutes
* Add "net/http/pprof" for profiling
* Add FreeOSMemory() to manually release memory on reload config

* Add flag to enable http profiler

* Fix memory leak (#4197)

* Fix memory leak

* removed unneeded nil assignment

* Fixing go routine leak (#4208)

* Merge fixes

* Merge fix

* Refactored statuses to be queried by the client rather than broadcast by the server (#4212)

* Refactored server code to reduce status broadcasts and to allow getting statuses by IDs

* Refactor client code to periodically fetch statuses

* Add store unit test for getting statuses by ids

* Fix status unit test

* Add getStatusesByIds REST API and move the client over to use that instead of the WebSocket

* Adding multiple threads to websocket hub (#4230)

* Adding multiple threads to websocket hub

* Fixing unit tests

* Fixing so websocket connections from the same user end up in the same… (#4240)

* Fixing so websocket connections from the same user end up in the same list

* Removing old comment

* Refactor user autocomplete to query the server (#4239)

* Add API for autocompleting users

* Converted at mention autocomplete to query server

* Converted user search autocomplete to query server

* Switch autocomplete API naming to use term instead of username

* Split autocomplete API into two, one for channels and for teams

* Fix copy/paste error

* Some final client scaling fixes (#4246)

* Add lazy loading of profiles to integration pages

* Add lazy loading of profiles to emoji page

* Fix JS error when receiving post in select team menu and also clean up channel store

model/websocket_message.go

@@ -31,6 +31,8 @@ const (
 type WebSocketMessage interface {
 	ToJson() string
 	IsValid() bool
+	DoPreComputeJson()
+	GetPreComputeJson() []byte
 }
 
 type WebsocketBroadcast struct {
@@ -41,9 +43,10 @@ type WebsocketBroadcast struct {
 }
 
 type WebSocketEvent struct {
-	Event     string                 `json:"event"`
-	Data      map[string]interface{} `json:"data"`
-	Broadcast *WebsocketBroadcast    `json:"broadcast"`
+	Event          string                 `json:"event"`
+	Data           map[string]interface{} `json:"data"`
+	Broadcast      *WebsocketBroadcast    `json:"broadcast"`
+	PreComputeJson []byte                 `json:"-"`
 }
 
 func (m *WebSocketEvent) Add(key string, value interface{}) {
@@ -59,6 +62,19 @@ func (o *WebSocketEvent) IsValid() bool {
 	return o.Event != ""
 }
 
+func (o *WebSocketEvent) DoPreComputeJson() {
+	b, err := json.Marshal(o)
+	if err != nil {
+		o.PreComputeJson = []byte("")
+	} else {
+		o.PreComputeJson = b
+	}
+}
+
+func (o *WebSocketEvent) GetPreComputeJson() []byte {
+	return o.PreComputeJson
+}
+
 func (o *WebSocketEvent) ToJson() string {
 	b, err := json.Marshal(o)
 	if err != nil {
@@ -80,10 +96,11 @@ func WebSocketEventFromJson(data io.Reader) *WebSocketEvent {
 }
 
 type WebSocketResponse struct {
-	Status   string                 `json:"status"`
-	SeqReply int64                  `json:"seq_reply,omitempty"`
-	Data     map[string]interface{} `json:"data,omitempty"`
-	Error    *AppError              `json:"error,omitempty"`
+	Status         string                 `json:"status"`
+	SeqReply       int64                  `json:"seq_reply,omitempty"`
+	Data           map[string]interface{} `json:"data,omitempty"`
+	Error          *AppError              `json:"error,omitempty"`
+	PreComputeJson []byte                 `json:"-"`
 }
 
 func (m *WebSocketResponse) Add(key string, value interface{}) {
@@ -111,6 +128,19 @@ func (o *WebSocketResponse) ToJson() string {
 	}
 }
 
+func (o *WebSocketResponse) DoPreComputeJson() {
+	b, err := json.Marshal(o)
+	if err != nil {
+		o.PreComputeJson = []byte("")
+	} else {
+		o.PreComputeJson = b
+	}
+}
+
+func (o *WebSocketResponse) GetPreComputeJson() []byte {
+	return o.PreComputeJson
+}
+
 func WebSocketResponseFromJson(data io.Reader) *WebSocketResponse {
 	decoder := json.NewDecoder(data)
 	var o WebSocketResponse