PLT-4430 improve slow channel switching (#4331)

* PLT-4430 improve slow channel switching

* Update client side unit tests

* Convert getChannelsUnread to getMyChannelMembers and address other feedback

* Pull channel members on websocket reconnect

model/channel_list.go

@@ -8,15 +8,11 @@ import (
 	"io"
 )
 
-type ChannelList struct {
-	Channels []*Channel                `json:"channels"`
-	Members  map[string]*ChannelMember `json:"members"`
-}
+type ChannelList []*Channel
 
 func (o *ChannelList) ToJson() string {
-	b, err := json.Marshal(o)
-	if err != nil {
-		return ""
+	if b, err := json.Marshal(o); err != nil {
+		return "[]"
 	} else {
 		return string(b)
 	}
@@ -28,7 +24,7 @@ func (o *ChannelList) Etag() string {
 	var t int64 = 0
 	var delta int64 = 0
 
-	for _, v := range o.Channels {
+	for _, v := range *o {
 		if v.LastPostAt > t {
 			t = v.LastPostAt
 			id = v.Id
@@ -39,30 +35,9 @@ func (o *ChannelList) Etag() string {
 			id = v.Id
 		}
 
-		member := o.Members[v.Id]
-
-		if member != nil {
-			max := v.LastPostAt
-			if v.UpdateAt > max {
-				max = v.UpdateAt
-			}
-
-			delta += max - member.LastViewedAt
-
-			if member.LastViewedAt > t {
-				t = member.LastViewedAt
-				id = v.Id
-			}
-
-			if member.LastUpdateAt > t {
-				t = member.LastUpdateAt
-				id = v.Id
-			}
-
-		}
 	}
 
-	return Etag(id, t, delta, len(o.Channels))
+	return Etag(id, t, delta, len(*o))
 }
 
 func ChannelListFromJson(data io.Reader) *ChannelList {