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package yarpc
import (
"encoding/binary"
"io"
"sync"
"github.com/gogo/protobuf/codec"
"github.com/influxdata/yamux"
"github.com/influxdata/yarpc/codes"
"github.com/influxdata/yarpc/status"
)
var (
codecPool = &sync.Pool{
New: func() interface{} {
return codec.New(1024)
},
}
)
type pooledCodec struct{}
var (
cd = &pooledCodec{}
)
func NewCodec() Codec {
return cd
}
func (*pooledCodec) Marshal(v interface{}) ([]byte, error) {
ci := codecPool.Get()
c := ci.(codec.Codec)
data, err := c.Marshal(v)
// To avoid a data race, create a copy of data before we return the codec to the pool.
dataCopy := append([]byte(nil), data...)
codecPool.Put(ci)
return dataCopy, err
}
func (*pooledCodec) Unmarshal(data []byte, v interface{}) error {
ci := codecPool.Get()
c := ci.(codec.Codec)
err := c.Unmarshal(data, v)
codecPool.Put(ci)
return err
}
type Codec interface {
Marshal(v interface{}) ([]byte, error)
Unmarshal(data []byte, v interface{}) error
}
type parser struct {
r io.Reader
header [4]byte
}
func (p *parser) recvMsg() (msg []byte, err error) {
if _, err := io.ReadFull(p.r, p.header[:]); err != nil {
return nil, err
}
length := binary.BigEndian.Uint32(p.header[:])
if length == 0 {
return nil, nil
}
msg = make([]byte, int(length))
if _, err := io.ReadFull(p.r, msg); err != nil {
if err == io.EOF {
err = io.ErrUnexpectedEOF
}
return nil, err
}
return msg, nil
}
func encode(c Codec, msg interface{}) ([]byte, error) {
var (
b []byte
length uint
)
if msg != nil {
var err error
b, err = c.Marshal(msg)
if err != nil {
// TODO(sgc): should return error with status code "internal"
return nil, status.Errorf(codes.Internal, "rpc: error while marshaling %v", err)
}
length = uint(len(b))
}
const (
sizeLen = 4
)
var buf = make([]byte, sizeLen+length)
binary.BigEndian.PutUint32(buf, uint32(length))
copy(buf[4:], b)
return buf, nil
}
func decode(p *parser, c Codec, s *yamux.Stream, m interface{}) error {
d, err := p.recvMsg()
if err != nil {
return err
}
if err := c.Unmarshal(d, m); err != nil {
return status.Errorf(codes.Internal, "rpc: failed to unmarshal received message %v", err)
}
return nil
}
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