90 lines
2.5 KiB
Go
90 lines
2.5 KiB
Go
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// Licensed to Elasticsearch B.V. under one or more contributor
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// license agreements. See the NOTICE file distributed with
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// this work for additional information regarding copyright
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// ownership. Elasticsearch B.V. licenses this file to you under
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// the Apache License, Version 2.0 (the "License"); you may
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// not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing,
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// software distributed under the License is distributed on an
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// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
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// KIND, either express or implied. See the License for the
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// specific language governing permissions and limitations
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// under the License.
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package tcp
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import (
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"io"
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"net"
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"time"
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"github.com/pkg/errors"
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)
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// ErrMaxReadBuffer returns when too many bytes was read on the io.Reader
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var ErrMaxReadBuffer = errors.New("max read buffer reached")
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// ResetableLimitedReader is based on LimitedReader but allow to reset the byte read and return a specific
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// error when we reach the limit.
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type ResetableLimitedReader struct {
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reader io.Reader
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maxReadBuffer uint64
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byteRead uint64
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}
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// NewResetableLimitedReader returns a new ResetableLimitedReader
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func NewResetableLimitedReader(reader io.Reader, maxReadBuffer uint64) *ResetableLimitedReader {
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return &ResetableLimitedReader{
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reader: reader,
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maxReadBuffer: maxReadBuffer,
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}
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}
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// Read reads the specified amount of byte
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func (m *ResetableLimitedReader) Read(p []byte) (n int, err error) {
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if m.byteRead >= m.maxReadBuffer {
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return 0, ErrMaxReadBuffer
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}
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n, err = m.reader.Read(p)
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m.byteRead += uint64(n)
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return
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}
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// Reset resets the number of byte read
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func (m *ResetableLimitedReader) Reset() {
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m.byteRead = 0
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}
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// IsMaxReadBufferErr returns true when the error is ErrMaxReadBuffer
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func IsMaxReadBufferErr(err error) bool {
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return err == ErrMaxReadBuffer
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}
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// DeadlineReader allow read to a io.Reader to timeout, the timeout is refreshed on every read.
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type DeadlineReader struct {
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conn net.Conn
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timeout time.Duration
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}
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// NewDeadlineReader returns a new DeadlineReader
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func NewDeadlineReader(c net.Conn, timeout time.Duration) *DeadlineReader {
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return &DeadlineReader{
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conn: c,
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timeout: timeout,
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}
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}
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// Read reads the number of bytes from the reader
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func (d *DeadlineReader) Read(p []byte) (n int, err error) {
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d.refresh()
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return d.conn.Read(p)
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}
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func (d *DeadlineReader) refresh() {
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d.conn.SetDeadline(time.Now().Add(d.timeout))
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}
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