func CreateProbeEventMsg(event *schema.ProbeEvent, id int64, version Format) ([]byte, error) {
if event.Id == "" {
// per http://blog.mikemccandless.com/2014/05/choosing-fast-unique-identifier-uuid.html,
// using V1 UUIDs is much faster than v4 like we were using
u := uuid.NewUUID()
event.Id = u.String()
}
buf := new(bytes.Buffer)
err := binary.Write(buf, binary.LittleEndian, uint8(version))
if err != nil {
return nil, fmt.Errorf(errFmtBinWriteFailed, err)
}
err = binary.Write(buf, binary.BigEndian, id)
if err != nil {
return nil, fmt.Errorf(errFmtBinWriteFailed, err)
}
var msg []byte
switch version {
case FormatProbeEventJson:
msg, err = json.Marshal(event)
case FormatProbeEventMsgp:
msg, err = event.MarshalMsg(nil)
default:
return nil, fmt.Errorf(errFmtUnknownFormat, version)
}
if err != nil {
return nil, fmt.Errorf("Failed to marshal metrics payload: %s", err)
}
_, err = buf.Write(msg)
if err != nil {
return nil, fmt.Errorf(errFmtBinWriteFailed, err)
}
return buf.Bytes(), nil
}
