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// Licensed to Elasticsearch B.V. under one or more contributor
// license agreements. See the NOTICE file distributed with
// this work for additional information regarding copyright
// ownership. Elasticsearch B.V. licenses this file to you under
// the Apache License, Version 2.0 (the "License"); you may
// not use this file except in compliance with the License.
// You may obtain a copy of the License at
// Unless required by applicable law or agreed to in writing,
// software distributed under the License is distributed on an
// KIND, either express or implied. See the License for the
// specific language governing permissions and limitations
// under the License.
package tcp
import (
// ErrMaxReadBuffer returns when too many bytes was read on the io.Reader
var ErrMaxReadBuffer = errors.New("max read buffer reached")
// ResetableLimitedReader is based on LimitedReader but allow to reset the byte read and return a specific
// error when we reach the limit.
type ResetableLimitedReader struct {
reader io.Reader
maxReadBuffer uint64
byteRead uint64
// NewResetableLimitedReader returns a new ResetableLimitedReader
func NewResetableLimitedReader(reader io.Reader, maxReadBuffer uint64) *ResetableLimitedReader {
return &ResetableLimitedReader{
reader: reader,
maxReadBuffer: maxReadBuffer,
// Read reads the specified amount of byte
func (m *ResetableLimitedReader) Read(p []byte) (n int, err error) {
if m.byteRead >= m.maxReadBuffer {
return 0, ErrMaxReadBuffer
n, err = m.reader.Read(p)
m.byteRead += uint64(n)
// Reset resets the number of byte read
func (m *ResetableLimitedReader) Reset() {
m.byteRead = 0
// IsMaxReadBufferErr returns true when the error is ErrMaxReadBuffer
func IsMaxReadBufferErr(err error) bool {
return err == ErrMaxReadBuffer
// DeadlineReader allow read to a io.Reader to timeout, the timeout is refreshed on every read.
type DeadlineReader struct {
conn net.Conn
timeout time.Duration
// NewDeadlineReader returns a new DeadlineReader
func NewDeadlineReader(c net.Conn, timeout time.Duration) *DeadlineReader {
return &DeadlineReader{
conn: c,
timeout: timeout,
// Read reads the number of bytes from the reader
func (d *DeadlineReader) Read(p []byte) (n int, err error) {
return d.conn.Read(p)
func (d *DeadlineReader) refresh() {
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