func CreateHekaStream(msgBytes []byte, outBytes *[]byte,
msc *message.MessageSigningConfig) error {
msgSize := uint32(len(msgBytes))
if msgSize > message.MAX_MESSAGE_SIZE {
return fmt.Errorf("Message too big, requires %d (MAX_MESSAGE_SIZE = %d)",
len(msgBytes), message.MAX_MESSAGE_SIZE)
}
h := &message.Header{}
h.SetMessageLength(msgSize)
if msc != nil {
h.SetHmacSigner(msc.Name)
h.SetHmacKeyVersion(msc.Version)
var hm hash.Hash
switch msc.Hash {
case "sha1":
hm = hmac.New(sha1.New, []byte(msc.Key))
h.SetHmacHashFunction(message.Header_SHA1)
default:
hm = hmac.New(md5.New, []byte(msc.Key))
}
hm.Write(msgBytes)
h.SetHmac(hm.Sum(nil))
}
headerSize := proto.Size(h)
if headerSize > message.MAX_HEADER_SIZE {
return fmt.Errorf("Message header too big, requires %d (MAX_HEADER_SIZE = %d)",
headerSize, message.MAX_HEADER_SIZE)
}
requiredSize := message.HEADER_FRAMING_SIZE + headerSize + len(msgBytes)
if cap(*outBytes) < requiredSize {
*outBytes = make([]byte, requiredSize)
} else {
*outBytes = (*outBytes)[:requiredSize]
}
(*outBytes)[0] = message.RECORD_SEPARATOR
(*outBytes)[1] = uint8(headerSize)
// This looks odd but is correct; it effectively "seeks" the initial write
// position for the protobuf output to be at the
// `(*outBytes)[message.HEADER_DELIMITER_SIZE]` position.
pbuf := proto.NewBuffer((*outBytes)[message.HEADER_DELIMITER_SIZE:message.HEADER_DELIMITER_SIZE])
if err := pbuf.Marshal(h); err != nil {
return err
}
(*outBytes)[headerSize+message.HEADER_DELIMITER_SIZE] = message.UNIT_SEPARATOR
copy((*outBytes)[message.HEADER_FRAMING_SIZE+headerSize:], msgBytes)
return nil
}
func CreateHekaStream(msgBytes []byte, outBytes *[]byte) error {
h := &message.Header{}
h.SetMessageLength(uint32(len(msgBytes)))
headerSize := proto.Size(h)
requiredSize := message.HEADER_FRAMING_SIZE + headerSize + len(msgBytes)
if cap(*outBytes) < requiredSize {
*outBytes = make([]byte, requiredSize)
} else {
*outBytes = (*outBytes)[:requiredSize]
}
(*outBytes)[0] = message.RECORD_SEPARATOR
(*outBytes)[1] = uint8(headerSize)
pbuf := proto.NewBuffer((*outBytes)[message.HEADER_DELIMITER_SIZE:message.HEADER_DELIMITER_SIZE])
if err := pbuf.Marshal(h); err != nil {
return err
}
(*outBytes)[headerSize+message.HEADER_DELIMITER_SIZE] = message.UNIT_SEPARATOR
copy((*outBytes)[message.HEADER_FRAMING_SIZE+headerSize:], msgBytes)
return nil
}