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/*
* Copyright (c) 2017-2018 Samsung Electronics Co., Ltd All Rights Reserved
*
* 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 dryad
import (
"bytes"
"context"
"fmt"
"strings"
"time"
"crypto/rsa"
. "git.tizen.org/tools/weles"
"golang.org/x/crypto/ssh"
)
const (
stmCommand = "/usr/local/bin/stm"
)
type sshClient struct {
config *ssh.ClientConfig
client *ssh.Client
}
// sessionProvider implements SessionProvider interface.
// FIXME: When the connection is broken after it is established, all client functions stall. This provider has to be rewritten.
type sessionProvider struct {
SessionProvider
dryad Dryad
connection *sshClient
sshfs *reverseSSHFS
}
func prepareSSHConfig(userName string, key rsa.PrivateKey) *ssh.ClientConfig {
signer, _ := ssh.NewSignerFromKey(&key)
return &ssh.ClientConfig{
User: userName,
Auth: []ssh.AuthMethod{
ssh.PublicKeys(signer),
},
HostKeyCallback: ssh.InsecureIgnoreHostKey(),
Timeout: 30 * time.Second, // TODO: Use value from config when such appears.
}
}
func (d *sessionProvider) connect() (err error) {
d.connection.client, err = ssh.Dial("tcp", d.dryad.Addr.String(), d.connection.config)
if err != nil {
return err
}
session, err := d.connection.client.NewSession()
if err != nil {
return err
}
return d.sshfs.open(session)
}
func (d *sessionProvider) newSession() (*ssh.Session, error) {
if d.connection.client == nil {
err := d.connect()
if err != nil {
return nil, err
}
}
session, err := d.connection.client.NewSession()
if err != nil {
return nil, err
}
return session, nil
}
func (d *sessionProvider) executeRemoteCommand(cmd string) ([]byte, []byte, error) {
session, err := d.newSession()
if err != nil {
return nil, nil, err
}
defer session.Close()
var stdout, stderr bytes.Buffer
session.Stdout = &stdout
session.Stderr = &stderr
err = session.Run(cmd)
return stdout.Bytes(), stderr.Bytes(), err
}
// NewSessionProvider returns new instance of SessionProvider.
func NewSessionProvider(dryad Dryad, workdir string) SessionProvider {
cfg := prepareSSHConfig(dryad.Username, dryad.Key)
return &sessionProvider{
dryad: dryad,
connection: &sshClient{
config: cfg,
},
sshfs: newReverseSSHFS(context.Background(), workdir, workdir),
}
}
// Exec is a part of SessionProvider interface.
// cmd parameter is used as is. Quotations should be added by the user as needed.
func (d *sessionProvider) Exec(cmd ...string) ([]byte, []byte, error) {
session, err := d.newSession()
if err != nil {
return nil, nil, err
}
defer session.Close()
err = d.sshfs.check(session)
if err != nil {
return nil, nil, err
}
return d.executeRemoteCommand(strings.Join(cmd, " "))
}
// DUT is a part of SessionProvider interface.
// This function requires 'stm' binary on MuxPi's NanoPi.
func (d *sessionProvider) DUT() error {
_, stderr, err := d.executeRemoteCommand(stmCommand + " -dut")
if err != nil {
return fmt.Errorf("DUT command failed: %s: %s", err, stderr)
}
return nil
}
// TS is a part of SessionProvider interface.
// This function requires 'stm' binary on MuxPi's NanoPi.
func (d *sessionProvider) TS() error {
_, stderr, err := d.executeRemoteCommand(stmCommand + " -ts")
if err != nil {
return fmt.Errorf("TS command failed: %s: %s", err, stderr)
}
return nil
}
// PowerTick is a part of SessionProvider interface.
// This function requires 'stm' binary on MuxPi's NanoPi.
func (d *sessionProvider) PowerTick() error {
_, stderr, err := d.executeRemoteCommand(stmCommand + " -tick")
if err != nil {
return fmt.Errorf("PowerTick command failed: %s: %s", err, stderr)
}
return nil
}
// Close is a part of SessionProvider interface.
func (d *sessionProvider) Close() error {
if d.connection.client == nil {
return nil
}
d.sshfs.close()
//TODO: log error.
err := d.connection.client.Close()
d.connection.client = nil
return err
}
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