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Copy pathdial_linux.go
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// +build linux
/*
* MinIO Cloud Storage, (C) 2020 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 (
"context"
"net"
"syscall"
"time"
"golang.org/x/sys/unix"
)
func setInternalTCPParameters(c syscall.RawConn) error {
return c.Control(func(fdPtr uintptr) {
// got socket file descriptor to set parameters.
fd := int(fdPtr)
// Enable TCP fast connect
// TCPFastOpenConnect sets the underlying socket to use
// the TCP fast open connect. This feature is supported
// since Linux 4.11.
_ = syscall.SetsockoptInt(fd, syscall.IPPROTO_TCP, unix.TCP_FASTOPEN_CONNECT, 1)
// The time (in seconds) the connection needs to remain idle before
// TCP starts sending keepalive probes, set this to 5 secs
// system defaults to 7200 secs!!!
_ = syscall.SetsockoptInt(fd, syscall.IPPROTO_TCP, syscall.TCP_KEEPIDLE, 5)
// Number of probes.
// ~ cat /proc/sys/net/ipv4/tcp_keepalive_probes (defaults to 9, we reduce it to 5)
// 9
_ = syscall.SetsockoptInt(fd, syscall.IPPROTO_TCP, syscall.TCP_KEEPCNT, 5)
// Wait time after successful probe in seconds.
// ~ cat /proc/sys/net/ipv4/tcp_keepalive_intvl (defaults to 75 secs, we reduce it to 3 secs)
// 75
_ = syscall.SetsockoptInt(fd, syscall.IPPROTO_TCP, syscall.TCP_KEEPINTVL, 3)
})
}
// DialContext is a function to make custom Dial for internode communications
type DialContext func(ctx context.Context, network, address string) (net.Conn, error)
// NewInternodeDialContext setups a custom dialer for internode communication
func NewInternodeDialContext(dialTimeout time.Duration) DialContext {
return func(ctx context.Context, network, addr string) (net.Conn, error) {
dialer := &net.Dialer{
Timeout: dialTimeout,
Control: func(network, address string, c syscall.RawConn) error {
return setInternalTCPParameters(c)
},
}
return dialer.DialContext(ctx, network, addr)
}
}
// NewCustomDialContext setups a custom dialer for any external communication and proxies.
func NewCustomDialContext(dialTimeout time.Duration) DialContext {
return func(ctx context.Context, network, addr string) (net.Conn, error) {
dialer := &net.Dialer{
Timeout: dialTimeout,
Control: func(network, address string, c syscall.RawConn) error {
return c.Control(func(fdPtr uintptr) {
// got socket file descriptor to set parameters.
fd := int(fdPtr)
// Enable TCP fast connect
// TCPFastOpenConnect sets the underlying socket to use
// the TCP fast open connect. This feature is supported
// since Linux 4.11.
_ = syscall.SetsockoptInt(fd, syscall.IPPROTO_TCP, unix.TCP_FASTOPEN_CONNECT, 1)
})
},
}
return dialer.DialContext(ctx, network, addr)
}
}