freifunkmanager/ssh/run.go

70 lines
1.5 KiB
Go

package ssh
import (
"bytes"
"net"
"github.com/genofire/golang-lib/log"
"golang.org/x/crypto/ssh"
)
type SSHResultHandler func(string, string, error)
func SSHResultToString(result string) string {
if len(result) > 0 {
result = result[:len(result)-1]
}
return result
}
func SSHResultToStringHandler(handler SSHResultHandler) SSHResultHandler {
return func(addr string, result string, err error) {
handler(addr, SSHResultToString(result), err)
}
}
func (m *Manager) RunEverywhere(cmd string, handler SSHResultHandler) {
m.clientsMUX.Lock()
defer m.clientsMUX.Unlock()
for host, client := range m.clients {
go func() {
result, err := m.run(host, client, cmd)
handler(host, result, err)
}()
}
}
func (m *Manager) RunOn(addr net.TCPAddr, cmd string) (string, error) {
client, err := m.ConnectTo(addr)
if err != nil {
return "", err
}
return m.run(addr.IP.String(), client, cmd)
}
func (m *Manager) run(host string, client *ssh.Client, cmd string) (string, error) {
session, err := client.NewSession()
defer session.Close()
if err != nil {
log.Log.Warnf("can not create session on %s: %s", host, err)
m.clientsMUX.Lock()
delete(m.clients, host)
m.clientsMUX.Unlock()
return "", err
}
buffer := &bytes.Buffer{}
session.Stdout = buffer
if err != nil {
log.Log.Warnf("can not create pipe for run on %s: %s", host, err)
delete(m.clients, host)
return "", err
}
err = session.Run(cmd)
if err != nil {
log.Log.Debugf("could not run %s on %s: %s", cmd, host, err)
return "", err
}
return buffer.String(), nil
}