You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: rpc.go
    path of file: ./repos/learning/golang/practice/go-crontab/gopath/src/github.com/coreos/etcd/vendor/github.com/ugorji/go/codec
    
    the code of the file until where you have to start completion: // Copyright (c) 2012-2018 Ugorji Nwoke. All rights reserved.
// Use of this source code is governed by a MIT license found in the LICENSE file.

package codec

import (
	"bufio"
	"errors"
	"io"
	"net/rpc"
	"sync"
)

// Rpc provides a rpc Server or Client Codec for rpc communication.
type Rpc interface {
	ServerCodec(conn io.ReadWriteCloser, h Handle) rpc.ServerCodec
	ClientCodec(conn io.ReadWriteCloser, h Handle) rpc.ClientCodec
}

// RPCOptions holds options specific to rpc functionality
type RPCOptions struct {
	// RPCNoBuffer configures whether we attempt to buffer reads and writes during RPC calls.
	//
	// Set RPCNoBuffer=true to turn buffering off.
	// Buffering can still be done if buffered connections are passed in, or
	// buffering is configured on th
    
func newRPCCodec2(r io.Reader, w io.Writer, c io.Closer, h Handle) rpcCodec {
	// defensive: ensure that jsonH has TermWhitespace turned on.
	if jsonH, ok := h.(*JsonHandle); ok && !jsonH.TermWhitespace {
		panic(errors.New("rpc requires a JsonHandle with TermWhitespace set to true"))
	}
	// always ensure that we use a flusher, and always flush what was written to the connection.
	// we lose nothing by using a buffered writer internally.
	f, ok := w.(ioFlusher)
	bh := h.getBasicHandle()
	if !bh.RPCNoBuffer {
		if bh.WriterBufferSize <= 0 {
			if !ok {
				bw := bufio.NewWriter(w)
				f, w = bw, bw
			}
		}
		if bh.ReaderBufferSize <= 0 {
			if _, ok = w.(ioPeeker); !ok {
				if _, ok = w.(ioBuffered); !ok {
					br := bufio.NewReader(r)
					r = br
				}
			}
		}
	}
	return rpcCodec{
		c:   c,
		w:   w,
		r:   r,
		f:   f,
		h:   h,
		enc: NewEncoder(w, h),
		dec: NewDecoder(r, h),
	}
}