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Busindre edited this page Nov 3, 2016 · 1 revision

Antes de continuar, asegúrese que ha leído el Turotial en 10 minutos!

Elementos del ejemplo.

Hay cuatro partes con las que se trabajaran en este ejemplo. El script Manager.sh manejará los otros scripts cuando sean necesarios.

  1. echo.sh
  2. count2.sh
  3. wsmanager.sh
  4. websocket.html

1. echo.sh

#!/bin/bash
#This script just echos a string or hello

if [ $# -gt 0 ]; then
    echo $1
else
    echo "Hello, Who are you?"
fi
exit

2. count2.sh

#!/bin/bash
#This is a modified version of the count.sh script in the ten minute tutorial
C=$1
if [ "$C" -eq "$C" ] 2>/dev/null; then
    # $C is a number
    for COUNT in $(seq 1 $C); do
      echo $COUNT
      sleep 1
    done
else
    echo "Sorry, I can't count to $C"
fi
exit

3. wsmanager.sh

#!/bin/bash
#This script is a simple manager for all the other bash scripts.
#This way you only need one running websocketd process.
while read C
do
    cdir=`pwd`
    script=''
    first=''
    args=''

    # does $C have arguments?
    spcs=`echo $C | grep \  | wc -l`
    if [ $spcs -eq 0 ]; then
        first=$C
    else
        # read the first arg to determine what script to run
        IFS=' ' read -a part <<< "$C"

        first=${part[0]}
        #remove the first part of the string, leave all the rest as args to pass to script
        args=${C#${part[0]} }
    fi

    # which script to run?
    if [ "$first" == "echo" ]; then
        script='echo.sh'

    elif [ "$first" == "count" ]; then
        script='count2.sh'
    fi

    if [ ! -z $script ]; then
        #echo $cdir/$script $args
        eval $cdir/$script $args
    else
        echo "I don't understand: $C"
    fi

done
exit

4. websocket.html

Usar JQuery ocasiona que Firefox no pueda interpretar contestaciones onmessage de Javascript desde websocketd.

<!DOCTYPE html>
<html>
  <head>
    <script src="http://code.jquery.com/jquery-1.11.0.min.js"></script>
    <title>Websocketd With Bash</title>
    <style>
      #wsresults {
          font-size: 15px;
          font-family: arial;
          margin: auto;
          padding: 10px;
          text-align: left;
      }
    </style>
  </head>
  <body>

    <div id="wsresults"></div>
    <div><a href="javascript: void(0);" id="1">echo 'JoeWalnes was here'</a></div>
    <div><a href="javascript: void(0);" id="2">echo</a></div>
    <div><a href="javascript: void(0);" id="3">count to 10</a></div>
    <div><a href="javascript: void(0);" id="4">count to Joe</a></div>

    <script>
    //https://github.com/joewalnes/websocketd
    //https://github.com/joewalnes/websocketd/wiki/Websocketd-on-Raspberry-Pi
    var ws = new WebSocket('ws://localhost:8080/');

    ws.onopen = function() {
        document.body.style.backgroundColor = '#cfc';
    };
    ws.onclose = function() {
        document.body.style.backgroundColor = null;
    };
    ws.onerror = function(evt) {
        $('#wsresults').html('Error: '+event.data);
    };
    ws.onmessage = function(event) {
        $('#wsresults').html(event.data);
    };


    $(document).ready(function() {

        $('#1').on('click', function(e){
            if (ws) {
                try {
                    ws.send("echo 'JoeWalnes was here.'");
                } catch (ex) {
                    alert('Cannot send: '+ex);
                }
            }
        });
        $('#2').on('click', function(e){
            if (ws) {
                try {
                        ws.send('echo');
                } catch (ex) {
                        alert('Cannot send: '+ex);
                }
            }
        });
        $('#3').on('click', function(e){
            if (ws) {
                try {
                        ws.send("count 10");
                } catch (ex) {
                        alert('Cannot send: '+ex);
                }
            }
        });
        $('#4').on('click', function(e){
            if (ws) {
                try {
                        ws.send("count 'Joe'");
                } catch (ex) {
                        alert('Cannot send: '+ex);
                }
            }
        });
    }); // end document ready
   </script>

  </body>
</html>

Arrancando el servicio websocketd.

Ejecutar websocketd a traves de la linea de comandos.

$ ./websocketd --port=8080 ./wsmanager.sh

Probar.

Visitar la URL http://localhost:8080

The websocketd user guide is a publicly editable wiki. Please contribute!

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Reference

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