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encoder.go
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/
encoder.go
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package packet
import (
"io"
"github.com/shaolinjehzu/go-socket.io/engineio/frame"
"github.com/shaolinjehzu/go-socket.io/logger"
)
// FrameWriter is the writer which supports framing.
type FrameWriter interface {
NextWriter(typ frame.Type) (io.WriteCloser, error)
}
type Encoder struct {
w FrameWriter
}
func NewEncoder(w FrameWriter) *Encoder {
return &Encoder{
w: w,
}
}
func (e *Encoder) NextWriter(ft frame.Type, pt Type) (io.WriteCloser, error) {
w, err := e.w.NextWriter(ft)
if err != nil {
return nil, err
}
var b [1]byte
if ft == frame.String {
b[0] = pt.StringByte()
} else {
b[0] = pt.BinaryByte()
}
if _, err := w.Write(b[:]); err != nil {
if closeErr := w.Close(); closeErr != nil {
logger.Error("close writer after write:", closeErr)
}
return nil, err
}
return w, nil
}