/
connection.go
59 lines (51 loc) · 1.38 KB
/
connection.go
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package controller
import (
"net"
"time"
"golang.org/x/crypto/ssh"
)
type Conn struct {
net.Conn
ReadTimeout time.Duration
WriteTimeout time.Duration
}
func (c *Conn) Read(b []byte) (int, error) {
err := c.Conn.SetReadDeadline(time.Now().Add(c.ReadTimeout))
if err != nil {
return 0, err
}
return c.Conn.Read(b)
}
func (c *Conn) Write(b []byte) (int, error) {
err := c.Conn.SetWriteDeadline(time.Now().Add(c.WriteTimeout))
if err != nil {
return 0, err
}
return c.Conn.Write(b)
}
// SSHDialTimeout dials in SSH with a timeout. It sends periodic keepalives such as the remote host don't make the go client sit on Wait().
func SSHDialTimeout(network, addr string, config *ssh.ClientConfig, timeout time.Duration) (*ssh.Client, error) {
conn, err := net.DialTimeout(network, addr, timeout)
if err != nil {
return nil, err
}
timeoutConn := &Conn{conn, timeout, timeout}
c, chans, reqs, err := ssh.NewClientConn(timeoutConn, addr, config)
if err != nil {
return nil, err
}
client := ssh.NewClient(c, chans, reqs)
// this sends keepalive packets every 2 seconds
// there's no useful response from these, so we can just abort if there's an error
go func() {
t := time.NewTicker(2 * time.Second)
defer t.Stop()
for range t.C {
_, _, err := client.Conn.SendRequest("keepalive@golang.org", true, nil)
if err != nil {
return
}
}
}()
return client, nil
}