// Transactional function to enqueue a bid, while keeping accounts in balance
func EnqueueBid(c appengine.Context, bid *Bid) (*datastore.Key, error) {
var bidKey *datastore.Key
f := func(c appengine.Context) error {
dao := NewGaeAccountingDao(c, true)
if err := bid.CheckBalance(dao); err != nil {
return err
}
//parentKey := ArticleKey(c, bid.Article)
//parentKey := AccountKey(c, bid.Participant)
if key, err := datastore.Put(c, datastore.NewIncompleteKey(c, "Bid", nil), bidCodec{bid}); err != nil {
return err
} else {
bidKey = key
}
if err := bid.Book(dao, bidKey.Encode()); err != nil {
return err
}
if err := addRetireBidTask(c, bidKey.Encode(), bid); err != nil {
return err
}
// Encode the new bid as a hotBid and put it into a pull queue
hot := newHotBid(bidKey, bid)
if bytes, err := json.Marshal(*hot); err != nil {
return err
} else {
var task taskqueue.Task
task.Method = "PULL"
task.Payload = bytes
task.Tag = string(bid.Article)
taskqueue.Add(c, &task, "hotbids")
}
return dao.Flush()
}
if err := datastore.RunInTransaction(c, f, &datastore.TransactionOptions{XG: true}); err != nil {
return nil, err
}
return bidKey, nil
}
