Adding etag to channel extra_info api call.

model/channel.go

@@ -27,6 +27,7 @@ type Channel struct {
 	Description   string `json:"description"`
 	LastPostAt    int64  `json:"last_post_at"`
 	TotalMsgCount int64  `json:"total_msg_count"`
+	ExtraUpdateAt int64  `json:"extra_update_at"`
 }
 
 func (o *Channel) ToJson() string {
@@ -50,7 +51,11 @@ func ChannelFromJson(data io.Reader) *Channel {
 }
 
 func (o *Channel) Etag() string {
-	return Etag(o.Id, o.LastPostAt)
+	return Etag(o.Id, o.UpdateAt)
+}
+
+func (o *Channel) ExtraEtag() string {
+	return Etag(o.Id, o.ExtraUpdateAt)
 }
 
 func (o *Channel) IsValid() *AppError {
@@ -97,8 +102,13 @@ func (o *Channel) PreSave() {
 
 	o.CreateAt = GetMillis()
 	o.UpdateAt = o.CreateAt
+	o.ExtraUpdateAt = o.CreateAt
 }
 
 func (o *Channel) PreUpdate() {
 	o.UpdateAt = GetMillis()
 }
+
+func (o *Channel) ExtraUpdated() {
+	o.ExtraUpdateAt = GetMillis()
+}

model/client.go

@@ -457,8 +457,8 @@ func (c *Client) UpdateLastViewedAt(channelId string) (*Result, *AppError) {
 	}
 }
 
-func (c *Client) GetChannelExtraInfo(id string) (*Result, *AppError) {
-	if r, err := c.DoGet("/channels/"+id+"/extra_info", "", ""); err != nil {
+func (c *Client) GetChannelExtraInfo(id string, etag string) (*Result, *AppError) {
+	if r, err := c.DoGet("/channels/"+id+"/extra_info", "", etag); err != nil {
 		return nil, err
 	} else {
 		return &Result{r.Header.Get(HEADER_REQUEST_ID),