feat: add redis cache and fanout support

server/push/fcm/payload.go

@@ -39,7 +39,7 @@ func payloadToData(pl *push.Payload) (map[string]string, error) {
 	// Must use "xfrom" because "from" is a reserved word. Google did not bother to document it anywhere.
 	data["xfrom"] = pl.From
 	if pl.What == push.ActMsg {
-		data["seq"] = strconv.Itoa(pl.SeqId)
+		data["seq"] = strconv.FormatInt(pl.SeqId, 10)
 		if pl.ContentType != "" {
 			data["mime"] = pl.ContentType
 		}
@@ -81,7 +81,7 @@ func payloadToData(pl *push.Payload) (map[string]string, error) {
 		data["modeWant"] = pl.ModeWant.String()
 		data["modeGiven"] = pl.ModeGiven.String()
 	} else if pl.What == push.ActRead {
-		data["seq"] = strconv.Itoa(pl.SeqId)
+		data["seq"] = strconv.FormatInt(pl.SeqId, 10)
 		data["silent"] = "true"
 	} else {
 		return nil, errors.New("unknown push type")

server/push/push.go

@@ -76,7 +76,7 @@ type Payload struct {
 	// Message sender 'usrXXX'
 	From string `json:"from"`
 	// Sequential ID of the message.
-	SeqId int `json:"seq"`
+	SeqId int64 `json:"seq"`
 	// MIME-Type of the message content, text/x-drafty or text/plain
 	ContentType string `json:"mime"`
 	// Actual Data.Content of the message, if requested