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dev_ecs_emeter.go
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dev_ecs_emeter.go
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package godevman
import (
"encoding/xml"
"fmt"
"regexp"
"strconv"
"strings"
"time"
"github.com/patrickmn/go-cache"
)
// Adds ECS energy-meter device functionality to device type
type deviceEcsEmeter struct {
device
}
// ECS specific system info type used by device web API
type EcsStatus1 struct {
XMLName xml.Name `xml:"root"`
Chardata string `xml:",chardata"`
Name string `xml:"name"`
Type string `xml:"type"`
Class string `xml:"class"`
Text string `xml:"text"`
}
//
type EcsReadings1 struct {
XMLName xml.Name `xml:"root"`
Text string `xml:",chardata"`
Par string `xml:"par"`
Data []string `xml:"d"`
}
// Make http GET request and return byte slice of body.
// Argument string should contain request parameters.
func (sd *deviceEcsEmeter) WebApiGet(params string) ([]byte, error) {
req := "GET /" + params + " HTTP/1.1\r\n" +
"Host: " + sd.ip + "\r\n" +
"User-Agent: godevman\r\n\r\n"
res, err := TcpReq(req, sd.ip, "80")
if err != nil {
return nil, err
}
reParts := regexp.MustCompile(`(?s)^(.*?)\r\n\r\n(.*)`)
parts := reParts.FindStringSubmatch(string(res))
if parts != nil && strings.HasPrefix(parts[0], "HTTP/") && len(parts) > 2 {
return []byte(strings.Join(parts[2:], "")), nil
}
return res, nil
}
// Identify ECS verion (v1 or v2)
func (sd *deviceEcsEmeter) ecsVersion() (string, error) {
// return from cache if allowed and cache is present
if sd.useCache {
if x, found := sd.cache.Get("ecsVersion"); found {
return x.(string), nil
}
}
var out string
res, err := sd.WebApiGet("status.xml")
if err != nil {
return out, fmt.Errorf("get request from device api failed: %s", err)
}
if strings.Contains(string(res), "Energy Meter") {
out = "v1"
}
if out != "v1" {
res, err := sd.WebApiGet("login.cgi")
if err != nil {
return out, fmt.Errorf("get request from device api failed: %s", err)
}
if strings.Contains(string(res), "granted") {
out = "v2"
} else {
return out, fmt.Errorf("ecs identify failed")
}
}
// save to cache
sd.cache.Set("ecsVersion", out, cache.DefaultExpiration)
return out, nil
}
// Get info from web
// Valid targets values: "All", "Descr", "ObjectID", "Name"
func (sd *deviceEcsEmeter) System(targets []string) (System, error) {
out := System{
ObjectID: ValString{
IsSet: true,
Value: "no-snmp-ecs",
},
}
ver, err := sd.ecsVersion()
if err != nil {
return out, fmt.Errorf("ecsVersionerror: %s", err)
}
if ver == "v2" {
out.Descr.Value = "Energy Meter v2"
out.Descr.IsSet = true
return out, nil
}
if ver == "v1" {
res, err := sd.WebApiGet("status.xml")
if err != nil {
return out, fmt.Errorf("ecsVersion error: %s", err)
}
var v EcsStatus1
err = xml.Unmarshal([]byte(res), &v)
if err != nil {
return out, fmt.Errorf("xml unmarshal error: %s", err)
}
for _, t := range targets {
if t == "All" || t == "Descr" {
out.Descr.Value = v.Type
out.Descr.IsSet = true
}
if t == "All" || t == "Name" {
out.Name.Value = v.Name
out.Name.IsSet = true
}
}
}
return out, err
}
// Get energy redings
func (sd *deviceEcsEmeter) Ereadings() (*EReadings, error) {
ver, err := sd.ecsVersion()
if err != nil {
return nil, fmt.Errorf("ecsVersion error: %s", err)
}
out := EReadings{
timeStamp: uint(time.Now().Unix()),
}
if ver == "v1" {
res, err := sd.WebApiGet("values.xml")
if err != nil {
return nil, fmt.Errorf("get readings error: %s", err)
}
var v EcsReadings1
err = xml.Unmarshal([]byte(res), &v)
if err != nil {
return nil, fmt.Errorf("xml unmarshal error: %s", err)
}
d := strings.Replace(v.Data[4], ",", ".", 1)
n := strings.Replace(v.Data[5], ",", ".", 1)
df, err := strconv.ParseFloat(d, 64)
if err != nil {
return nil, fmt.Errorf("ParseFloat day value error: %s", err)
}
nf, err := strconv.ParseFloat(n, 64)
if err != nil {
return nil, fmt.Errorf("ParseFloat night value error: %s", err)
}
out.day.Value = uint64(df * 10000)
out.day.Divisor = 10000
out.day.Unit = "kWh"
out.day.IsSet = true
out.night.Value = uint64(nf * 10000)
out.night.Divisor = 10000
out.night.Unit = "kWh"
out.night.IsSet = true
return &out, nil
}
if ver == "v2" {
res, err := sd.WebApiGet("eVision.cgi?dataType=HOME&t=" + RandomString(8))
if err != nil {
return nil, fmt.Errorf("get readings error: %s", err)
}
reDay := regexp.MustCompile(`(?s)ActEnergyT1imp=([\d\.]+)`)
dParts := reDay.FindStringSubmatch(string(res))
reNight := regexp.MustCompile(`(?s)ActEnergyT2imp=([\d\.]+)`)
nParts := reNight.FindStringSubmatch(string(res))
if len(dParts) == 2 {
df, err := strconv.ParseFloat(dParts[1], 64)
if err != nil {
return nil, fmt.Errorf("ParseFloat day value error: %s", err)
}
out.day.Value = uint64(df * 10000)
out.day.Divisor = 10000
out.day.Unit = "kWh"
out.day.IsSet = true
}
if len(nParts) == 2 {
nf, err := strconv.ParseFloat(nParts[1], 64)
if err != nil {
return nil, fmt.Errorf("ParseFloat night value error: %s", err)
}
out.night.Value = uint64(nf * 10000)
out.night.Divisor = 10000
out.night.Unit = "kWh"
out.night.IsSet = true
}
return &out, nil
}
return nil, fmt.Errorf("readings not found")
}