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client.go
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client.go
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package client
import (
"encoding/binary"
"fmt"
"net"
"strings"
"code.cloudfoundry.org/cfdev/errors"
)
type Client struct {
name [5]byte
socket string
}
// clientName must be 5 characters
func New(clientName, socketPath string) *Client {
c := &Client{socket: socketPath}
copy(c.name[:], clientName[:5])
return c
}
const eofReadingExitCodeMsg = "reading errorcode from cfdevd"
const connectCfdevdMsg = "connecting to cfdevd"
// sends command and returns serverName (and error)
func (c *Client) Send(command uint8) (string, error) {
handshake := append(c.name[:], make([]byte, 44, 44)...)
conn, err := net.Dial("unix", c.socket)
if err != nil {
return "", errors.SafeWrap(err, connectCfdevdMsg)
}
defer conn.Close()
if err := binary.Write(conn, binary.LittleEndian, handshake); err != nil {
return "", errors.SafeWrap(err, "sending handshake to cfdevd")
}
if err := binary.Read(conn, binary.LittleEndian, handshake); err != nil {
return "", errors.SafeWrap(err, "reading handshake from cfdevd")
}
serverName := string(handshake[:5])
if err := binary.Write(conn, binary.LittleEndian, []byte{command}); err != nil {
return serverName, errors.SafeWrap(err, "sending command to cfdevd")
}
errorCode := make([]byte, 1, 1)
if err := binary.Read(conn, binary.LittleEndian, errorCode); err != nil {
return serverName, errors.SafeWrap(err, eofReadingExitCodeMsg)
} else if errorCode[0] != 0 {
return serverName, errors.SafeWrap(nil, fmt.Sprintf("failed to uninstall cfdevd: errorcode: %d", errorCode[0]))
}
return serverName, nil
}
func (c *Client) Uninstall() (string, error) {
name, err := c.Send(1)
if err != nil && (strings.HasPrefix(err.Error(), eofReadingExitCodeMsg) || strings.HasPrefix(err.Error(), connectCfdevdMsg)) {
return name, nil
}
return name, err
}
func (c *Client) RemoveIPAlias() (string, error) {
name, err := c.Send(2)
if err != nil && (strings.HasPrefix(err.Error(), eofReadingExitCodeMsg) || strings.HasPrefix(err.Error(), connectCfdevdMsg)) {
return name, nil
}
return name, err
}
func (c *Client) AddIPAlias() (string, error) {
name, err := c.Send(3)
if err != nil && (strings.HasPrefix(err.Error(), eofReadingExitCodeMsg) || strings.HasPrefix(err.Error(), connectCfdevdMsg)) {
return name, nil
}
return name, err
}