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sensor.go
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sensor.go
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// sensor.go
package main
import (
"bufio"
"database/sql"
"fmt"
"go/constant"
"go/token"
"go/types"
"os"
"strconv"
"strings"
"sync"
"time"
"github.com/golang/glog"
)
// -----------------------------------------------
const (
TagSensorName = "@sensorName@"
TagPrevVal = "@prevVal@"
TagLastVal = "@lastVal@"
TagCondition = "@condition@"
)
// -----------------------------------------------
var sensorTickersLock sync.Mutex
var sensorTickers = map[int]*time.Ticker{}
var sensorPrevValLock sync.Mutex
var sensorPrevVal = map[int]string{}
// -----------------------------------------------
func init() {
RegisterInternalFunc(SensorFunc, "CpuUsage", CpuUsage)
RegisterInternalFunc(SensorFunc, "MemoryUsage", MemoryUsage)
}
// sensorSetup : read defined sensors from DB then create a ticker and start reading goroutine for each sensor
func sensorSetup(db *sql.DB) (err error) {
sensorObjs, err := getHomeObjects(db, ItemSensor, -1)
if err != nil {
return
}
if glog.V(3) {
glog.Info("\nSensor Objs\n", sensorObjs)
}
for _, sensor := range sensorObjs {
sensorUpdateTicker(sensor)
}
if glog.V(1) {
glog.Infof("sensorSetup Done (%d)", len(sensorTickers))
}
return
}
func sensorUpdateTicker(sensor HomeObject) (err error) {
sensorTickersLock.Lock()
defer sensorTickersLock.Unlock()
if glog.V(3) {
glog.Info("Sensor Values", sensor.Values)
}
// If sensor already active, stop it
ticker, exist := sensorTickers[sensor.Values[0].IdObject]
if exist {
ticker.Stop()
delete(sensorTickers, sensor.Values[0].IdObject)
}
isActive, err := sensor.getIntVal("IsActive")
if err != nil || isActive == 0 {
return
}
durationStr, err := sensor.getStrVal("Interval")
if err != nil {
return
}
// for empty duration, don't setup ticker
if len(strings.Trim(durationStr, " ")) <= 0 {
return
}
duration, err := time.ParseDuration(durationStr)
if err != nil {
glog.Errorf("Falied to parse duration (%s) : %s", durationStr, err)
return
}
if glog.V(2) {
glog.Infof("Sensor %d (nb act=%d) : Ticker(%v)", sensor.Values[0].IdObject, len(sensor.linkedObjs), duration)
}
sensorTickers[sensor.Values[0].IdObject] = time.NewTicker(duration)
go readSensor(sensor, sensorTickers[sensor.Values[0].IdObject])
return
}
// sensorCleanup : stop and remove all sensor ticker
func sensorCleanup() {
sensorTickersLock.Lock()
for key, ticker := range sensorTickers {
ticker.Stop()
delete(sensorTickers, key)
}
sensorTickersLock.Unlock()
if glog.V(1) {
glog.Info("sensorCleanup Done")
}
}
// readSensorValue : perform sensor readings
func readSensorValue(sensor HomeObject) (result string, err error) {
readCmd, err := sensor.getStrVal("ReadCmd")
if err != nil {
return
}
readParam, err := sensor.getStrVal("ReadParam")
if err != nil {
return
}
isInternal, err := sensor.getIntVal("IsInternal")
if err != nil {
return
}
if isInternal != 0 {
result, err = CallInternalFunc(SensorFunc, readCmd, readParam, "")
} else {
result, err = ExecExternalCmd(readCmd, readParam, "")
}
if glog.V(2) {
glog.Infof("readSensorValue %d : %s", sensor.Values[0].IdObject, result)
}
return
}
// getSensorLastValue : return prev sensor value if any, else readSensor
func getSensorLastValue(sensor HomeObject) (result string, err error) {
sensorPrevValLock.Lock()
result, found := sensorPrevVal[sensor.Values[0].IdObject]
sensorPrevValLock.Unlock()
if !found {
if glog.V(2) {
glog.Infof("getSensorLastValue no prev val for %d, reading sensor", sensor.Values[0].IdObject)
}
result, err = readSensorValue(sensor)
}
return
}
// readSensor : call readSensorValue according to corresponding ticker and handleSensorValue
func readSensor(sensor HomeObject, ticker *time.Ticker) {
for t := range ticker.C {
result, err := readSensorValue(sensor)
if err != nil {
glog.Errorf("readSensor fail %s ", err)
continue
}
handleSensorValue(t, sensor, result)
}
}
// handleSensorValue : trigger actor and store sensor value in DB
func handleSensorValue(t time.Time, sensor HomeObject, value string) {
sensorName, err := sensor.getStrVal("Name")
if err != nil {
return
}
record, err := sensor.getIntVal("Record")
if err != nil {
return
}
// Previous value
sensorPrevValLock.Lock()
prevVal, found := sensorPrevVal[sensor.Values[0].IdObject]
if !found {
prevVal = value // TODO get prev val from db ?
}
sensorPrevVal[sensor.Values[0].IdObject] = value
sensorPrevValLock.Unlock()
// Record value if required
if record != 0 { // TODO add more options : 0=never, 1=always, 2=only if change, ...
go recordSensorValue(t, sensor, value)
}
// Trigger linked sensorAct if any
for _, sensorAct := range sensor.linkedObjs {
go triggerSensorAct(sensorAct, sensorName, prevVal, value)
}
}
// recordSensorValue : store in DB a value for a given sensor reading
func recordSensorValue(t time.Time, sensor HomeObject, value string) {
db, err := openDB()
if err != nil {
return
}
defer db.Close()
sensorId := sensor.getId()
dataType, err := sensor.getIntVal("IdDataType")
if err != nil {
return
}
// check value regarding datatype
switch TDataType(dataType) {
case DBTypeBool, DBTypeInt, DBTypeDateTime:
_, err := strconv.Atoi(value)
if err != nil {
glog.Errorf("Fail to get int(%s) for sensor %d : %s", value, sensorId, err)
return
}
case DBTypeText:
case DBTypeFloat:
_, err := strconv.ParseFloat(value, 64)
if err != nil {
glog.Errorf("Fail to get float64(%s) for sensor %d : %s", value, sensorId, err)
return
}
default:
glog.Errorf("Unknown data type %d for sensor %d", dataType, sensorId)
return
}
_, err = db.Exec("insert into HistoSensor values ( ?, ?, ?);", t.Unix(), sensorId, value)
if err != nil {
glog.Errorf("Fail to store %d value (%s) for sensor %d : %s ", dataType, value, sensorId, err)
}
if glog.V(2) {
sensorName, _ := sensor.getStrVal("Name")
glog.Infof("recordSensorValue for %s (%s)", sensorName, value)
}
}
// triggerSensorAct
func triggerSensorAct(sensorAct HomeObject, sensorName string, prevVal string, lastVal string) {
sensorActId := sensorAct.getId()
// Check IsActive
isActive, err := sensorAct.getStrVal("IsActive")
if err != nil || isActive != "1" {
return
}
// Prepare condition
condition, err := sensorAct.getStrVal("Condition")
if err != nil {
return
}
condition = strings.TrimSpace(condition)
condition = strings.Replace(condition, TagSensorName, sensorName, -1)
condition = strings.Replace(condition, TagPrevVal, cleanSpaces(prevVal), -1)
condition = strings.Replace(condition, TagLastVal, cleanSpaces(lastVal), -1)
if glog.V(2) {
glog.Infof("Condition for sensorAct #%d (%s) = '%s'", sensorActId, sensorName, condition)
}
launchAct := false
if len(condition) <= 0 {
launchAct = true
} else {
// Eval condition
tv, err := types.Eval(token.NewFileSet(), nil, token.NoPos, condition)
if err != nil {
glog.Errorf("Fail to eval condition for sensorAct #%d (%s) '%s' : %s", sensorActId, sensorName, condition, err)
} else {
if tv.Value != nil {
launchAct = constant.BoolVal(tv.Value)
}
}
}
if launchAct {
// Prepare actorParam
actorParam, err := sensorAct.getStrVal("ActorParam")
if err != nil {
actorParam = lastVal
} else {
actorParam = strings.Replace(actorParam, TagSensorName, sensorName, -1)
actorParam = strings.Replace(actorParam, TagPrevVal, prevVal, -1)
actorParam = strings.Replace(actorParam, TagLastVal, lastVal, -1)
actorParam = strings.Replace(actorParam, TagCondition, condition, -1)
actorParam = cleanSpaces(actorParam)
}
actorId, err := sensorAct.getIntVal("idActor")
if err != nil {
return
}
if glog.V(1) {
glog.Infof("triggerSensorAct : launching Actor #%d", actorId)
}
triggerActorById(actorId, 1, actorParam)
}
}
// -----------------------------------------------
// -----------------------------------------------
var cpuReadNs int64
var cpuReadVal int
func readProcStat() (nano int64, read int, nb int, err error) {
nano = time.Now().UnixNano()
f, err := os.Open("/proc/stat")
if err != nil {
glog.Errorf("CpuUsage : %s", err)
return
}
defer f.Close()
var key string
var u, n, s int
scanner := bufio.NewScanner(f)
for scanner.Scan() {
line := scanner.Text()
_, err = fmt.Sscanf(line, "%s %d %d %d", &key, &u, &n, &s)
if err != nil {
glog.Errorf("Scan fail '%s' : %s", line, err)
return
}
if key == "cpu" {
read = u + n + s
} else if strings.HasPrefix(key, "cpu") {
nb++
} else {
break
}
}
return
}
func CpuUsage(param1 string, param2 string) (string, error) {
nano, read, nb, err := readProcStat()
if err != nil {
return "99", err
}
// If previous mesure was more than 60s ago
if nano-cpuReadNs > 60000000 {
cpuReadNs = nano
cpuReadVal = read
time.Sleep(time.Second)
nano, read, nb, err = readProcStat()
if err != nil {
return "99", err
}
}
load := float32(int64(read-cpuReadVal)*1000000000.0) / float32((nano-cpuReadNs)*int64(nb)*1.0)
load += 0.5 // for rounding when converting with %.0f
if glog.V(1) {
glog.Infof("CpuUsage %3.2f = %d / ( %d * %d )", load, (read-cpuReadVal)*1000000000, nano-cpuReadNs, nb)
}
return fmt.Sprintf("%.0f", load), nil
}
func MemoryUsage(param1 string, param2 string) (string, error) {
f, err := os.Open("/proc/meminfo")
if err != nil {
glog.Errorf("CpuUsage : %s", err)
return "99", err
}
defer f.Close()
var key string
var val, total, free int
scanner := bufio.NewScanner(f)
for scanner.Scan() {
line := scanner.Text()
_, err = fmt.Sscanf(line, "%s %d", &key, &val)
if err != nil {
glog.Errorf("Scan fail '%s' : %s", line, err)
return "99", err
}
if key == "MemTotal:" {
total = val
} else if key == "MemFree:" {
free = val
} else {
break
}
}
used := float32((total-free)*100) / float32(total)
if glog.V(1) {
glog.Infof("MemoryUsage %3.2f = %d / %d", used, total, free)
}
return fmt.Sprintf("%.0f", used), nil
}