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protocol.go
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protocol.go
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package remotecommand
import (
"bufio"
"encoding/binary"
"fmt"
"io"
)
type MessageType byte
const (
StdoutData MessageType = 0
StdoutClose MessageType = 1
StderrData MessageType = 2
StderrClose MessageType = 3
StdinData MessageType = 4
StdinClose MessageType = 5
ExitCode MessageType = 6
)
type Message struct {
messageType MessageType
exitCode int64
data io.Reader
bytes []byte
}
func newDataMessage(messageType MessageType, data []byte) *Message {
return &Message{
messageType: messageType,
bytes: data,
}
}
func newCloseMessage(messageType MessageType) *Message {
return &Message{
messageType: messageType,
}
}
func NewExitCodeMessage(exitCode int) *Message {
return &Message{
messageType: ExitCode,
bytes: binary.AppendVarint([]byte{}, int64(exitCode)),
}
}
func ParseMessage(reader io.Reader) (*Message, error) {
buf := bufio.NewReader(reader)
messageTypeInt, err := buf.ReadByte()
if err != nil {
return nil, err
}
switch MessageType(messageTypeInt) {
case StdoutClose, StderrClose, StdinClose:
return &Message{
messageType: MessageType(messageTypeInt),
}, nil
case StdoutData, StderrData, StdinData:
return &Message{
messageType: MessageType(messageTypeInt),
data: buf,
}, nil
case ExitCode:
exitCode, err := binary.ReadVarint(buf)
if err != nil {
return nil, fmt.Errorf("read exit code: %w", err)
}
return &Message{
messageType: ExitCode,
exitCode: exitCode,
}, nil
default:
return nil, fmt.Errorf("unrecognized message type %b", messageTypeInt)
}
}
func (m *Message) Bytes() []byte {
return append([]byte{byte(m.messageType)}, m.bytes...)
}