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// Copyright 2021 Northern.tech AS
//
// 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 shell
import (
"bufio"
"errors"
"io"
"time"
"github.com/mendersoftware/go-lib-micro/ws"
wsshell "github.com/mendersoftware/go-lib-micro/ws/shell"
log "github.com/sirupsen/logrus"
"github.com/mendersoftware/mender-connect/connectionmanager"
)
var (
ErrExecWriteBytesShort = errors.New("failed to write the whole message")
)
const pipStdoutBufferSize = 255
type MenderShell struct {
sessionId string
r io.Reader
w io.Writer
running bool
}
// Create a new shell, note that we assume that r Reader and w Writer
// are already connected to the i/o of the shell process and ws websocket
// is connected and ws.SetReadDeadline(time.Now().Add(defaultPingWait))
// was already called and ping-pong was established
func NewMenderShell(sessionId string, r io.Reader, w io.Writer) *MenderShell {
shell := MenderShell{
sessionId: sessionId,
r: r,
w: w,
running: false,
}
return &shell
}
func (s *MenderShell) GetWriteTimeout() time.Duration {
return connectionmanager.GetWriteTimeout()
}
func (s *MenderShell) Start() {
go s.pipeStdout()
s.running = true
}
func (s *MenderShell) Stop() {
s.running = false
}
func (s *MenderShell) IsRunning() bool {
return s.running
}
func (s *MenderShell) sendStopMessage(err error) {
body := []byte{}
status := wsshell.ErrorMessage
if err != nil {
body = []byte(err.Error())
status = wsshell.ErrorMessage
}
msg := &ws.ProtoMsg{
Header: ws.ProtoHdr{
Proto: ws.ProtoTypeShell,
MsgType: wsshell.MessageTypeStopShell,
SessionID: s.sessionId,
Properties: map[string]interface{}{
"status": status,
},
},
Body: body,
}
err = connectionmanager.Write(ws.ProtoTypeShell, msg)
if err != nil {
log.Debugf("error on write: %s", err.Error())
}
}
func (s *MenderShell) pipeStdout() {
raw := make([]byte, pipStdoutBufferSize)
sr := bufio.NewReader(s.r)
for {
if !s.IsRunning() {
return
}
n, err := sr.Read(raw)
if err != nil {
log.Errorf("error reading stdout: %s", err)
s.sendStopMessage(err)
return
} else if !s.IsRunning() {
return
}
msg := &ws.ProtoMsg{
Header: ws.ProtoHdr{
Proto: ws.ProtoTypeShell,
MsgType: wsshell.MessageTypeShellCommand,
SessionID: s.sessionId,
Properties: map[string]interface{}{
"status": wsshell.NormalMessage,
},
},
Body: raw[:n],
}
err = connectionmanager.Write(ws.ProtoTypeShell, msg)
if err != nil {
log.Debugf("error on write: %s", err.Error())
}
}
}
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