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main.go
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main.go
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package main
import (
"bytes"
"flag"
"fmt"
"io/ioutil"
"log"
"net/http"
"os"
"text/template"
"github.com/jszwec/csvutil"
"github.com/pkg/browser"
)
type TemplateArgument struct {
Data []Data
}
type Data struct {
Date string `csv:"Date"`
Temperature float64 `csv:"temperature"`
Humidity int `csv:"humidity"`
}
const (
app = "temphum"
)
var (
flags *flag.FlagSet
filename string
addr string
)
func setFlags() {
flags = flag.NewFlagSet(app, flag.ExitOnError)
flags.StringVar(&addr, "addr", ":8888", "http service address")
}
func main() {
setFlags()
flags.Parse(os.Args[1:])
if flags.NArg() != 1 {
fmt.Println("please specify filename")
return
}
filename = flags.Args()[0]
http.HandleFunc("/", handler)
url := "http://localhost" + addr
log.Print("Listening on " + url)
browser.OpenURL(url)
http.ListenAndServe(addr, nil)
}
func handler(w http.ResponseWriter, r *http.Request) {
var data []Data
b, err := ioutil.ReadFile(filename)
if err != nil {
errorResponse(err, w)
return
}
if err = csvutil.Unmarshal(b, &data); err != nil {
errorResponse(err, w)
return
}
t := TemplateArgument{Data: data}
tpl, err := template.New("html").Parse(html)
if err != nil {
errorResponse(err, w)
return
}
buf := new(bytes.Buffer)
tpl.Execute(buf, t)
fmt.Fprint(w, buf.String())
}
func errorResponse(err error, w http.ResponseWriter) {
fmt.Fprintf(w, "Error occurred: %v", err)
}
const html = `
<html>
<head>
<meta name="viewport" content="width=device-width, initial-scale=1">
<script src="https://cdn.jsdelivr.net/npm/chart.js@2.8.0"></script>
</head>
<body>
<div style="width:75%;">
<canvas id="myChart"></canvas>
</div>
</body>
<script type="text/javascript">
(function() {
var labels = [];
var temperatures = [];
var humidities = [];
{{range .Data}}
labels.push('{{.Date}}');
temperatures.push('{{.Temperature}}');
humidities.push('{{.Humidity}}');
{{end}}
var lineChartData = {
labels: labels,
datasets: [{
label: 'Temperatures',
borderColor: 'rgb(255, 99, 132)',
backgroundColor: 'rgb(255, 99, 132)',
fill: false,
data: temperatures,
yAxisID: 'y-axis-1',
}, {
label: 'Humidities',
borderColor: 'rgb(54, 162, 235)',
backgroundColor: 'rgb(54, 162, 235)',
fill: false,
data: humidities,
yAxisID: 'y-axis-2'
}]
};
var ctx = document.getElementById('myChart').getContext('2d');
var chart = Chart.Line(ctx, {
data: lineChartData,
options: {
responsive: true,
hoverMode: 'index',
stacked: false,
scales: {
yAxes: [{
type: 'linear',
display: true,
position: 'left',
id: 'y-axis-1',
}, {
type: 'linear',
display: true,
position: 'right',
id: 'y-axis-2',
gridLines: {
drawOnChartArea: false, // only want the grid lines for one axis to show up
},
}],
}
}
});
})();
</script>
</html>
`