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Copy pathbufconn.go
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Copy pathbufconn.go
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101 lines (89 loc) · 3.2 KB
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/*
* Minio Cloud Storage, (C) 2017 Minio, Inc.
*
* Licensed 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
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package http
import (
"bufio"
"net"
"time"
)
// BufConn - is a generic stream-oriented network connection supporting buffered reader and read/write timeout.
type BufConn struct {
QuirkConn
bufReader *bufio.Reader // buffered reader wraps reader in net.Conn.
readTimeout time.Duration // sets the read timeout in the connection.
writeTimeout time.Duration // sets the write timeout in the connection.
updateBytesReadFunc func(int) // function to be called to update bytes read.
updateBytesWrittenFunc func(int) // function to be called to update bytes written.
}
// Sets read timeout
func (c *BufConn) setReadTimeout() {
if c.readTimeout != 0 && c.canSetReadDeadline() {
c.SetReadDeadline(time.Now().UTC().Add(c.readTimeout))
}
}
func (c *BufConn) setWriteTimeout() {
if c.writeTimeout != 0 {
c.SetWriteDeadline(time.Now().UTC().Add(c.writeTimeout))
}
}
// RemoveTimeout - removes all configured read and write
// timeouts. Used by callers which control net.Conn behavior
// themselves.
func (c *BufConn) RemoveTimeout() {
c.readTimeout = 0
c.writeTimeout = 0
// Unset read/write timeouts, since we use **bufio** it is not
// guaranteed that the underlying Peek/Read operation in-fact
// indeed performed a Read() operation on the network. With
// that in mind we need to unset any timeouts currently set to
// avoid any pre-mature timeouts.
c.SetDeadline(time.Time{})
}
// Peek - returns the next n bytes without advancing the reader. It just wraps bufio.Reader.Peek().
func (c *BufConn) Peek(n int) ([]byte, error) {
c.setReadTimeout()
return c.bufReader.Peek(n)
}
// Read - reads data from the connection using wrapped buffered reader.
func (c *BufConn) Read(b []byte) (n int, err error) {
c.setReadTimeout()
n, err = c.bufReader.Read(b)
if err == nil && c.updateBytesReadFunc != nil {
c.updateBytesReadFunc(n)
}
return n, err
}
// Write - writes data to the connection.
func (c *BufConn) Write(b []byte) (n int, err error) {
c.setWriteTimeout()
n, err = c.Conn.Write(b)
if err == nil && c.updateBytesWrittenFunc != nil {
c.updateBytesWrittenFunc(n)
}
return n, err
}
// newBufConn - creates a new connection object wrapping net.Conn.
func newBufConn(c net.Conn, readTimeout, writeTimeout time.Duration,
updateBytesReadFunc, updateBytesWrittenFunc func(int)) *BufConn {
return &BufConn{
QuirkConn: QuirkConn{Conn: c},
bufReader: bufio.NewReader(c),
readTimeout: readTimeout,
writeTimeout: writeTimeout,
updateBytesReadFunc: updateBytesReadFunc,
updateBytesWrittenFunc: updateBytesWrittenFunc,
}
}