github.com/coreos/mantle@v0.13.0/network/nsdialer.go (about)

     1  // Copyright 2015 CoreOS, Inc.
     2  //
     3  // Licensed under the Apache License, Version 2.0 (the "License");
     4  // you may not use this file except in compliance with the License.
     5  // You may obtain a copy of the License at
     6  //
     7  //     http://www.apache.org/licenses/LICENSE-2.0
     8  //
     9  // Unless required by applicable law or agreed to in writing, software
    10  // distributed under the License is distributed on an "AS IS" BASIS,
    11  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    12  // See the License for the specific language governing permissions and
    13  // limitations under the License.
    14  
    15  package network
    16  
    17  import (
    18  	"net"
    19  
    20  	"github.com/vishvananda/netns"
    21  
    22  	"github.com/coreos/mantle/system/ns"
    23  )
    24  
    25  // NsDialer is a RetryDialer that can enter any network namespace.
    26  type NsDialer struct {
    27  	RetryDialer
    28  	NsHandle netns.NsHandle
    29  }
    30  
    31  func NewNsDialer(ns netns.NsHandle) *NsDialer {
    32  	return &NsDialer{
    33  		RetryDialer: RetryDialer{
    34  			Dialer: net.Dialer{
    35  				Timeout:   DefaultTimeout,
    36  				KeepAlive: DefaultKeepAlive,
    37  			},
    38  			Retries: DefaultRetries,
    39  		},
    40  		NsHandle: ns,
    41  	}
    42  }
    43  
    44  func (d *NsDialer) Dial(network, address string) (net.Conn, error) {
    45  	nsExit, err := ns.Enter(d.NsHandle)
    46  	if err != nil {
    47  		return nil, err
    48  	}
    49  	defer nsExit()
    50  
    51  	return d.RetryDialer.Dial(network, address)
    52  }