/
air.go
139 lines (118 loc) · 2.72 KB
/
air.go
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package main
import (
"bufio"
"encoding/json"
zmq "github.com/pebbe/zmq4"
"github.com/prometheus/client_golang/prometheus"
serial "github.com/tarm/goserial"
"log"
"net/http"
"strconv"
"strings"
"time"
)
type AIR struct {
site string
device string
address string
}
type Message struct {
Pressure float64 `json:"pressure"`
Temperature float64 `json:"temperature"`
Vol float64 `json:"volumetic-flow"`
Mass float64 `json:"mass-flow"`
Setpoint float64 `json:"set-point"`
Gas string `json:"gas"`
Site string `json:"site"`
At time.Time `json:"at"`
}
var (
airLog = prometheus.NewGauge(prometheus.GaugeOpts{
Name: "trailer_air_flow",
Help: "Current Air flow.",
})
)
func (air AIR) Sample() string {
data := air.read()
message := air.parse(data)
airLog.Set(message.Mass)
json_message, err := json.Marshal(message)
if err != nil {
log.Fatal(err)
}
return string(json_message)
}
func (air AIR) parse(data string) Message {
/* log.Print(data) */
elements := strings.Fields(data)
/* log.Print(elements) */
pressure, _ := strconv.ParseFloat(elements[1], 64)
temperature, _ := strconv.ParseFloat(elements[2], 64)
vol, _ := strconv.ParseFloat(elements[3], 64)
mass, _ := strconv.ParseFloat(elements[4], 64)
setpoint, _ := strconv.ParseFloat(elements[5], 64)
gas := elements[6]
return Message{pressure, temperature, vol, mass, setpoint, gas, air.site, time.Now()}
}
// Send a couple of returns to wake up the controller
func (air AIR) wake() {
c := serial.Config{Name: air.device, Baud: 9600}
port, err := serial.OpenPort(&c)
if err != nil {
log.Fatal(err)
}
defer port.Close()
for i := 0; i < 5; i++ {
query := air.address + "\r"
_, err = port.Write([]byte(query))
if err != nil {
log.Fatal(err)
}
}
}
func (air AIR) read() string {
c := serial.Config{Name: air.device, Baud: 9600}
port, err := serial.OpenPort(&c)
if err != nil {
log.Fatal(err)
}
defer port.Close()
query := air.address + "\r"
_, err = port.Write([]byte(query))
if err != nil {
log.Fatal(err)
}
reader := bufio.NewReader(port)
reply, err := reader.ReadBytes('\x0d')
if err != nil {
log.Fatal(err)
}
return string(reply)
}
func readMassFlowController() {
air := AIR{}
air.site = "glbrc"
air.device = "/dev/ttyS5"
air.address = "A"
socket, err := zmq.NewSocket(zmq.PUB)
if err != nil {
log.Fatal(err)
}
defer socket.Close()
socket.Bind("tcp://*:5558")
air.wake()
for {
sample := air.Sample()
log.Print(sample)
socket.Send(sample, 0)
time.Sleep(10 * time.Second)
}
}
func init() {
prometheus.MustRegister(airLog)
}
func main() {
go readMassFlowController()
http.Handle("/metrics", prometheus.Handler())
http.ListenAndServe(":9093", nil)
}