You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
85 lines
1.8 KiB
85 lines
1.8 KiB
8 years ago
|
package sarama
|
||
|
|
|
||
|
|
import "fmt"
|
||
|
|
|
||
|
|
// Encoder is the interface that wraps the basic Encode method.
|
||
|
|
// Anything implementing Encoder can be turned into bytes using Kafka's encoding rules.
|
||
|
|
type encoder interface {
|
||
|
|
encode(pe packetEncoder) error
|
||
|
|
}
|
||
|
|
|
||
|
|
// Encode takes an Encoder and turns it into bytes.
|
||
|
|
func encode(e encoder) ([]byte, error) {
|
||
|
|
if e == nil {
|
||
|
|
return nil, nil
|
||
|
|
}
|
||
|
|
|
||
|
|
var prepEnc prepEncoder
|
||
|
|
var realEnc realEncoder
|
||
|
|
|
||
|
|
err := e.encode(&prepEnc)
|
||
|
|
if err != nil {
|
||
|
|
return nil, err
|
||
|
|
}
|
||
|
|
|
||
|
|
if prepEnc.length < 0 || prepEnc.length > int(MaxRequestSize) {
|
||
|
|
return nil, PacketEncodingError{fmt.Sprintf("invalid request size (%d)", prepEnc.length)}
|
||
|
|
}
|
||
|
|
|
||
|
|
realEnc.raw = make([]byte, prepEnc.length)
|
||
|
|
err = e.encode(&realEnc)
|
||
|
|
if err != nil {
|
||
|
|
return nil, err
|
||
|
|
}
|
||
|
|
|
||
|
|
return realEnc.raw, nil
|
||
|
|
}
|
||
|
|
|
||
|
|
// Decoder is the interface that wraps the basic Decode method.
|
||
|
|
// Anything implementing Decoder can be extracted from bytes using Kafka's encoding rules.
|
||
|
|
type decoder interface {
|
||
|
|
decode(pd packetDecoder) error
|
||
|
|
}
|
||
|
|
|
||
|
|
type versionedDecoder interface {
|
||
|
|
decode(pd packetDecoder, version int16) error
|
||
|
|
}
|
||
|
|
|
||
|
|
// Decode takes bytes and a Decoder and fills the fields of the decoder from the bytes,
|
||
|
|
// interpreted using Kafka's encoding rules.
|
||
|
|
func decode(buf []byte, in decoder) error {
|
||
|
|
if buf == nil {
|
||
|
|
return nil
|
||
|
|
}
|
||
|
|
|
||
|
|
helper := realDecoder{raw: buf}
|
||
|
|
err := in.decode(&helper)
|
||
|
|
if err != nil {
|
||
|
|
return err
|
||
|
|
}
|
||
|
|
|
||
|
|
if helper.off != len(buf) {
|
||
|
|
return PacketDecodingError{"invalid length"}
|
||
|
|
}
|
||
|
|
|
||
|
|
return nil
|
||
|
|
}
|
||
|
|
|
||
|
|
func versionedDecode(buf []byte, in versionedDecoder, version int16) error {
|
||
|
|
if buf == nil {
|
||
|
|
return nil
|
||
|
|
}
|
||
|
|
|
||
|
|
helper := realDecoder{raw: buf}
|
||
|
|
err := in.decode(&helper, version)
|
||
|
|
if err != nil {
|
||
|
|
return err
|
||
|
|
}
|
||
|
|
|
||
|
|
if helper.off != len(buf) {
|
||
|
|
return PacketDecodingError{"invalid length"}
|
||
|
|
}
|
||
|
|
|
||
|
|
return nil
|
||
|
|
}
|