func tailLogFile(r *rds.RDS, db, name string, numLines int64, marker string) (string, string, error) {
req := &rds.DownloadDBLogFilePortionInput{
DBInstanceIdentifier: aws.String(db),
LogFileName: aws.String(name),
}
if numLines != 0 {
req.NumberOfLines = aws.Int64(numLines)
}
if marker != "" {
req.Marker = aws.String(marker)
}
var buf bytes.Buffer
var markerPtr *string
err := r.DownloadDBLogFilePortionPages(req, func(p *rds.DownloadDBLogFilePortionOutput, lastPage bool) bool {
if p.LogFileData != nil {
buf.WriteString(*p.LogFileData)
}
if lastPage {
markerPtr = p.Marker
}
return true
})
marker = ""
if markerPtr != nil {
marker = *markerPtr
}
return buf.String(), marker, err
}
