func (self *mysqlMessageCache) CacheMessage(service, username string, mc *rpc.MessageContainer, ttl time.Duration) (id string, err error) {
data, err := json.Marshal(mc.Message)
if err != nil {
return
}
if mc.Id == "" {
id = randomId()
mc.Id = id
} else {
id = mc.Id
}
uniqid := getUniqMessageId(service, username, id)
if len(uniqid) > maxMessageIdLength {
err = fmt.Errorf("message id length is greater than %v characters", maxMessageIdLength)
return
}
if len(username) > maxUsernameLength {
err = fmt.Errorf("user %v's name is too long", username)
return
}
if len(mc.Sender) > maxUsernameLength {
err = fmt.Errorf("user %v's name is too long", mc.Sender)
return
}
if len(service) > maxServicenameLength {
err = fmt.Errorf("service %v's name is too long", service)
return
}
if len(mc.SenderService) > maxServicenameLength {
err = fmt.Errorf("service %v's name is too long", mc.SenderService)
return
}
now := time.Now()
mc.Birthday = now
deadline := now.Add(ttl)
if ttl < 1*time.Second {
// max possible value for int64
deadline = time.Unix(0, 0)
}
var result sql.Result
err = self.expBackoffRetry(3, 2, func() error {
result, err = self.cacheStmt.Exec(uniqid, id, service, username, mc.SenderService, mc.Sender, now.Unix(), deadline.Unix(), data)
return err
})
if err != nil {
err = fmt.Errorf("Data base error: %v; insert error", err)
return
}
n, err := result.RowsAffected()
if err != nil {
return
}
if n != 1 {
err = fmt.Errorf("affected %v rows, which is weird", n)
return
}
return
}
