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main.go
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package main
import (
"context"
"fmt"
"log"
"net/http"
"net/url"
"os"
"os/signal"
"syscall"
"time"
"github.com/krasi-georgiev/rpi-web-control/server"
"github.com/krasi-georgiev/rpiGpio"
"github.com/coreos/go-systemd/daemon"
"github.com/urfave/cli"
)
var (
hanldeSignals = []os.Signal{syscall.SIGINT, syscall.SIGKILL}
srvConfig = server.NewConfig()
app = cli.NewApp()
)
func main() {
app.Name = "Raspberry Pi GPIO web controller"
app.Version = "17.04"
app.Compiled = time.Now()
app.Usage = "Raspberry Pi based golang app to control raspberry Pi GPIO ports using a web interface"
app.Flags = []cli.Flag{
cli.UintFlag{
Name: "p,port",
Value: 80,
Usage: "port for the webserver",
},
cli.StringFlag{
Name: "pp,password",
Usage: "required password for the web server",
},
}
app.Action = func(c *cli.Context) error {
// start the signal handler as soon as we can to make sure that
// we don't miss any signals during boot
quit := make(chan os.Signal, 128)
signal.Notify(quit, hanldeSignals...)
var err error
if err = srvConfig.SetPort(c); err != nil {
fmt.Println("Incorrect Usage!")
cli.ShowCommandHelp(c, "")
return err
}
if err = srvConfig.SetPass(c); err != nil {
fmt.Println("Incorrect Usage!")
cli.ShowCommandHelp(c, "")
return err
}
srv := &http.Server{Addr: ":" + srvConfig.Port}
http.HandleFunc("/control", control)
http.HandleFunc("/", home)
go func() {
log.Print("Started web server on port ", srvConfig.Port)
if err := srv.ListenAndServe(); err != http.ErrServerClosed {
log.Printf("Httpserver: ListenAndServe() error: %s", err)
os.Exit(1)
}
}()
// send heartbeat signals to systemd otherwise it will restart the process
go func() {
interval, err := daemon.SdWatchdogEnabled(false)
if err != nil || interval == 0 {
log.Print("Watchdog not enabled for this service!")
return
}
for {
time.Sleep(interval / 3)
res, err := http.Get("http://127.0.0.1:" + srvConfig.Port)
if err == nil {
daemon.SdNotify(false, "WATCHDOG=1")
} else {
log.Printf("RPi Controller watchdog error: %v", err)
}
res.Body.Close()
}
}()
return shutdown(quit, srv)
}
if err := app.Run(os.Args); err != nil {
fmt.Fprintf(os.Stderr, "%s\n", err)
os.Exit(1)
}
}
func control(w http.ResponseWriter, r *http.Request) {
u, _ := url.Parse(r.RequestURI)
v := u.Query()
if err := srvConfig.Authenticate(v); err != nil {
fmt.Fprint(w, err.Error())
return
}
var ctype, delay, pin string
if d, ok := v["type"]; ok {
ctype = d[0]
}
if d, ok := v["delay"]; ok && d[0] != "" {
delay = d[0]
}
if d, ok := v["pin"]; ok && d[0] != "" {
pin = d[0]
}
t, err := rpiGpio.NewControl(rpiGpio.SetType(ctype), rpiGpio.SetDelay(delay), rpiGpio.SetPin(pin))
if err != nil {
log.Printf(err.Error())
fmt.Fprint(w, err)
return
}
if err := t.Run(); err != nil {
r := fmt.Sprintf("Huston we have a problem : %v", err)
log.Printf(r)
fmt.Fprint(w, r)
} else {
fmt.Fprint(w, "done")
}
}
func shutdown(quit chan os.Signal, srv *http.Server) error {
log.Print("Received signal: ", <-quit)
if err := srv.Shutdown(context.Background()); err != nil {
return err
}
log.Print("gracefull shutdown!")
return nil
}
func home(w http.ResponseWriter, r *http.Request) {
fmt.Fprintf(w, `
<html lang='en'>
<head>
<meta name='viewport' content='width=device-width, initial-scale=1, maximum-scale=1'>
<title>RPi Web controller</title>
<style>
form {
width: 80%%;
margin: 0 auto;
max-width: 400px;
}
body {font-size: 20px;font-family: Arial;}
input,select {padding: 10px;font-size: 14px;width:100%%; margin:10px 0px}
input[type=submit] {
cursor: pointer;
display: inline-block;
color: #fff;
border: 0px solid #6b963c;
padding: 5px 10px;
margin: 5px 0px;
background-color:#5c9fcd;
font-size: 30px;
}
#result {
font-weight:bold;
text-align:center;
}
#loaderWrapper {
width:30px;
margin:0 auto;
}
.loader {
border: 16px solid #f3f3f3; /* Light grey */
border-top: 16px solid #3498db; /* Blue */
border-radius: 50%%;
height: 30px;
animation: spin 1s linear infinite;
}
@keyframes spin {
0%% { transform: rotate(0deg); }
100%% { transform: rotate(360deg); }
}
</style>
</head>
<body>
<form id="controllerForm">
<fieldset>
<legend>Control Options</legend>
<select id="type">
<option value="timer">timer</option>
<option value="toggle">toggle</option>
</select>
<input type="password" id="pass" placeholder="password" />
<input type="text" id="pin" placeholder="Pin (optional, default is %v)" >
<input type="text" id="delay" placeholder="Delay (optional, default is %v)">
<input type="submit" value="GO">
</fieldset>
</form>
<div id="loaderWrapper"></div>
<div id="result"></div>
<script type="text/javascript">
var pass = getCookie("pass");
if (pass != "") {
document.getElementById("pass").value = pass;
}
var pin = getCookie("pin");
if (pin != "") {
document.getElementById("pin").value = pin;
}
var delay = getCookie("delay");
if (delay != "") {
document.getElementById("delay").value = delay;
}
var controllerForm = document.forms["controllerForm"];
controllerForm.onsubmit = function(event){
event.preventDefault();
var today = new Date();
today.setMonth(today.getMonth()+12);
document.cookie = "pass="+document.getElementById("pass").value + ';expires=' + today.toGMTString();
document.cookie = "pin="+document.getElementById("pin").value + ';expires=' + today.toGMTString();
document.cookie = "delay="+document.getElementById("delay").value + ';expires=' + today.toGMTString();
var pass="pass="+document.getElementById("pass").value;
var type="&type="+document.getElementById("type").value;
var pin="&pin="+document.getElementById("pin").value;
var delay="&delay="+document.getElementById("delay").value;
var xhttp = new XMLHttpRequest();
xhttp.open("GET","/control?"+pass+type+pin+delay,true);
document.getElementById("result").innerHTML = "";
document.getElementById("loaderWrapper").classList.add('loader');
xhttp.onload = function() {
document.getElementById("loaderWrapper").classList.remove('loader');
if (xhttp.status == 200) {
document.getElementById("result").innerHTML = this.responseText;
}
else{
document.getElementById("result").innerHTML = "request error";
}
}
xhttp.onreadystatechange = function() {
document.getElementById("loaderWrapper").classList.remove('loader');
if (xhttp.readyState == 4 && xhttp.status == 0) {
document.getElementById("result").innerHTML = "server error";
}
};
xhttp.timeout = 4000;
xhttp.ontimeout = function () {
document.getElementById("loaderWrapper").classList.remove('loader');
document.getElementById("result").innerHTML = "timeout";
}
xhttp.send();
}
function getCookie(cname) {
var name = cname + "=";
var decodedCookie = decodeURIComponent(document.cookie);
var ca = decodedCookie.split(';');
for(var i = 0; i <ca.length; i++) {
var c = ca[i];
while (c.charAt(0) == ' ') {
c = c.substring(1);
}
if (c.indexOf(name) == 0) {
return c.substring(name.length, c.length);
}
}
return "";
}
</script>
</body>
</html>
`, rpiGpio.DefaultPin, rpiGpio.DefaultDelay)
}