// Start the adaptor as a source
func (r *Rethinkdb) Start() error {
if r.debug {
fmt.Printf("getting a changes cursor\n")
}
// Grab a changes cursor before sending all rows. The server will buffer
// changes while we reindex the entire table.
var ccursor *gorethink.Cursor
ccursor, err := gorethink.Table(r.table).Changes().Run(r.client)
if err != nil {
r.pipe.Err <- err
return err
}
defer ccursor.Close()
if err := r.sendAllDocuments(); err != nil {
r.pipe.Err <- err
return err
}
if r.tail {
if err := r.sendChanges(ccursor); err != nil {
r.pipe.Err <- err
return err
}
}
return nil
}
func (r *Rethinkdb) sendChanges(table string, ccursor *gorethink.Cursor) error {
defer ccursor.Close()
if r.debug {
fmt.Printf("sending changes for %s\n", table)
}
var change rethinkDbChangeNotification
for ccursor.Next(&change) {
if stop := r.pipe.Stopped; stop {
return nil
}
if r.debug {
fmt.Printf("change: %#v\n", change)
}
var msg *message.Msg
if change.Error != "" {
return errors.New(change.Error)
} else if change.OldVal != nil && change.NewVal != nil {
msg = message.NewMsg(message.Update, r.prepareDocument(change.NewVal), r.computeNamespace(table))
} else if change.NewVal != nil {
msg = message.NewMsg(message.Insert, r.prepareDocument(change.NewVal), r.computeNamespace(table))
} else if change.OldVal != nil {
msg = message.NewMsg(message.Delete, r.prepareDocument(change.OldVal), r.computeNamespace(table))
}
if msg != nil {
r.pipe.Send(msg)
if r.debug {
fmt.Printf("msg: %#v\n", msg)
}
}
}
if err := ccursor.Err(); err != nil {
return err
}
return nil
}