// note that after calling this method, you MUST either write returnBytesLength to this pipe
// or return an error code from the Read() method
func (r *readPipe) WriteHeader(code int32, returnBytesLength int) error {
r.req.status = Status(code)
headerBytes := r.req.serializeHeader(returnBytesLength)
log.Printf("readResponse.WriterHeader: Code %d returnBytesLength %d", code, returnBytesLength)
r.numInPipe = len(headerBytes) + returnBytesLength
err := r.pipe.Grow(r.numInPipe)
if err != nil {
log.Printf("Error growing pipe to size %d : %s", r.numInPipe, err.Error())
r.req.status = EIO
splice.Drop(r.pipe)
r.pipe = nil
return err
}
// response header goes in buffer first, before read results
_, err = r.pipe.Write(headerBytes)
if err != nil {
log.Printf("Error writing header to pipe prior to read: %s\n", err)
r.req.status = EIO
splice.Drop(r.pipe)
return err
}
return nil
}
func (r *readPipe) Reset() (err error) {
splice.Drop(r.pipe)
r.pipe, err = splice.Get()
r.numInPipe = 0
return err
}