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// SPDX-License-Identifier: GPL-3.0-or-later
package upsd
import (
"encoding/csv"
"errors"
"fmt"
"strings"
"github.com/netdata/netdata/go/go.d.plugin/pkg/socket"
)
const (
commandUsername = "USERNAME %s"
commandPassword = "PASSWORD %s"
commandListUPS = "LIST UPS"
commandListVar = "LIST VAR %s"
commandLogout = "LOGOUT"
)
// https://github.com/networkupstools/nut/blob/81fca30b2998fa73085ce4654f075605ff0b9e01/docs/net-protocol.txt#L647
var errUpsdCommand = errors.New("upsd command error")
type upsUnit struct {
name string
vars map[string]string
}
func newUpsdConn(conf Config) upsdConn {
return &upsdClient{conn: socket.New(socket.Config{
ConnectTimeout: conf.Timeout.Duration(),
ReadTimeout: conf.Timeout.Duration(),
WriteTimeout: conf.Timeout.Duration(),
Address: conf.Address,
})}
}
type upsdClient struct {
conn socket.Client
}
func (c *upsdClient) connect() error {
return c.conn.Connect()
}
func (c *upsdClient) disconnect() error {
_, _ = c.sendCommand(commandLogout)
return c.conn.Disconnect()
}
func (c *upsdClient) authenticate(username, password string) error {
cmd := fmt.Sprintf(commandUsername, username)
resp, err := c.sendCommand(cmd)
if err != nil {
return err
}
if resp[0] != "OK" {
return errors.New("authentication failed: invalid username")
}
cmd = fmt.Sprintf(commandPassword, password)
resp, err = c.sendCommand(cmd)
if err != nil {
return err
}
if resp[0] != "OK" {
return errors.New("authentication failed: invalid password")
}
return nil
}
func (c *upsdClient) upsUnits() ([]upsUnit, error) {
resp, err := c.sendCommand(commandListUPS)
if err != nil {
return nil, err
}
var upsNames []string
for _, v := range resp {
if !strings.HasPrefix(v, "UPS ") {
continue
}
parts := splitLine(v)
if len(parts) < 2 {
continue
}
name := parts[1]
upsNames = append(upsNames, name)
}
var upsUnits []upsUnit
for _, name := range upsNames {
cmd := fmt.Sprintf(commandListVar, name)
resp, err := c.sendCommand(cmd)
if err != nil {
return nil, err
}
ups := upsUnit{
name: name,
vars: make(map[string]string),
}
upsUnits = append(upsUnits, ups)
for _, v := range resp {
if !strings.HasPrefix(v, "VAR ") {
continue
}
parts := splitLine(v)
if len(parts) < 4 {
continue
}
n, v := parts[2], parts[3]
ups.vars[n] = v
}
}
return upsUnits, nil
}
func (c *upsdClient) sendCommand(cmd string) ([]string, error) {
var resp []string
var errMsg string
endLine := getEndLine(cmd)
err := c.conn.Command(cmd+"\n", func(bytes []byte) bool {
line := string(bytes)
resp = append(resp, line)
if strings.HasPrefix(line, "ERR ") {
errMsg = strings.TrimPrefix(line, "ERR ")
}
return line != endLine && errMsg == ""
})
if err != nil {
return nil, err
}
if errMsg != "" {
return nil, fmt.Errorf("%w: %s (cmd: '%s')", errUpsdCommand, errMsg, cmd)
}
return resp, nil
}
func getEndLine(cmd string) string {
px, _, _ := strings.Cut(cmd, " ")
switch px {
case "USERNAME", "PASSWORD", "VER":
return "OK"
}
return fmt.Sprintf("END %s", cmd)
}
func splitLine(s string) []string {
r := csv.NewReader(strings.NewReader(s))
r.Comma = ' '
parts, _ := r.Read()
return parts
}
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