官方地址：https://github.com/joewalnes/websocketd

　　websocketd是WebSocket守护进程，它负责处理WebSocket连接，启动您的程序来处理WebSockets，并在程序和Web浏览器之间传递消息。

一、安装：websocketd

wget https://github.com/joewalnes/websocketd/releases/download/v0.2.12/websocketd-0.2.12-linux_amd64.zip

unzip  websocketd-0.2.12-linux_amd64.zip

解压后生成这个文件：websocketd

复制该文件到 /usr/bin目录下，修改环境变量

sudo cp websocketd /usr/bin/websocketd

sudo vim /etc/profile

export  PATH=$PATH:/usr/bin/websocketd

可能出现的错误：如果修改了/etc/profile，那么编辑结束后执行source profile 或执行点命令 ./profile,PATH的值就会立即生效了，但是会提示以下错误：

#source /etc/profile   之后为什么会出现
command not found

解决办法，直接切换到root 用户模式既可，再次执行source profile 就可以了，输入help 看是否配置合适，如下所示：

tinywan@tinywan:~/shell$ websocketd --help
websocketd (0.2.12 (go1.6 linux-amd64) --)

websocketd is a command line tool that will allow any executable program
that accepts input on stdin and produces output on stdout to be turned into
a WebSocket server.

Usage:

  Export a single executable program a WebSocket server:
    websocketd [options] COMMAND [command args]

  Or, export an entire directory of executables as WebSocket endpoints:
    websocketd [options] --dir=SOMEDIR

Options:

  --port=PORT                    HTTP port to listen on.

  --address=ADDRESS              Address to bind to (multiple options allowed)
                                 Use square brackets to specify IPv6 address. 
                                 Default: "" (all)

二、开启WebSocketd 服务

tinywan@tinywan:~/shell$ websocketd --port=63800 ./count.sh 
Mon, 08 May 2017 17:26:50 +0800 | INFO   | server     |  | Serving using application   : ./count.sh 
Mon, 08 May 2017 17:26:50 +0800 | INFO   | server     |  | Starting WebSocket server   : ws://tinywan:8080/

测试代码：count.sh

#!/bin/bash
for ((COUNT = 1; COUNT <= 10; COUNT++)); do
  echo $COUNT
  sleep 1
done

运行脚本时你可能会遇到以下错误：

root@TinywanAliYun:/home/www/bin# websocketd --port=63800 ./count.sh 
Unable to locate specified COMMAND './count.sh' in OS path.

Usage:

  Export a single executable program a WebSocket server:
    websocketd [options] COMMAND [command args]

  Or, export an entire directory of executables as WebSocket endpoints:
    websocketd [options] --dir=SOMEDIR

  Or, show extended help message using:
    websocketd --help

请赋予权限，使其可执行：

$ chmod +x ./count.sh

随便打开一个浏览器，在console中输入一下代码测试：

var ws = new WebSocket('ws://192.168.18.12:63800/');
ws.onopen = function() {
    console.log('CONNECT');
};
ws.onclose = function() {
    console.log('DISCONNECT');
};
ws.onmessage = function(event) {
    console.log('MESSAGE: ' + event.data);
};

（1）测试结果如下所示：

（2）新建立一个客户端测试client.html

<!doctype html>
<html lang="">
<head>
    <meta charset="utf-8">
    <meta name="description" content="">
    <meta name="viewport" content="width=device-width, initial-scale=1">
    <meta http-equiv="x-ua-compatible" content="ie=edge">
    <title>websocketd</title>
</head>
<body>
<h2>websocketd 客户端的简单测试</h2>
<pre id="log"></pre>
<script>
    // helper function: log message to screen
    function log(msg) {
        document.getElementById('log').textContent += msg + '\n';
    }

    // setup websocket with callbacks
    var ws = new WebSocket('ws://192.168.18.12:8080/');
    ws.onopen = function() {
        console.log('CONNECT');
    };
    ws.onclose = function() {
        console.log('DISCONNECT');
    };
    ws.onmessage = function(event) {
        console.log('MESSAGE: ' + event.data);
    };
</script>
</body>
</html>

在查看结果信息，查看结果已经ok

查看服务端信息

我本机IP地址为，也就是client.html客户端

websocketd --port=9501 --devconsole luajit ./json_ws.lua

》》》实际案例，使用WebSocketd 实时监控内存信息

1、编写脚本，system_info_send_websocketd.sh

#!/bin/bash
PATH=/usr/local/bin:/usr/bin:/bin

SHELL_DIR="/home/www/bin"
SHELL_NAME="system_info_websocketd"
SHELL_TIME=$(date '+%Y-%m-%d')
SHELL_LOG="${SHELL_DIR}/${SHELL_NAME}-${SHELL_TIME}.log"

REDIS_MEMORY_KEYS_NAME="REDIS_MEMORY_INFO:001"
REDIS_DISH_KEYS_NAME="REDIS_DISH_INFO:001"

while(true)
    do
        FIND_DATA=$(cat /proc/meminfo | grep "MemFree:" | awk '{print $2}')
        echo  "[$SHELL_TIME]: FIND_DATA = $FIND_DATA INSERT_RES = ${INSERT_RES} CUT_LIST_LEN = ${CUT_LIST_LEN}" >> $SHELL_LOG
        echo   '{"data":'"${FIND_DATA}"',"errcode":0,"errmsg":0}'
        sleep 2
done

2、客户端实时监控代码：

<div class="panel-footer" id="container" style="width: 100%; height: 400px; margin: 0 auto"></div>
<script language="JavaScript">
    //数据获取
    var moniServerIp = "{{moniServerIp}}";
    var moniServerSshUsername = "{$moniServerSshUsername}";
    var moniServerSshPassword = "{$moniServerSshPassword}";

    var wsServerIP = "127.0.0.1";
    var wsServerPort = "12380";
    var moniMehtod = "server02";
    var moniInterval = 1;
    var moniDataUnit = 'MB';

    var wsData = 0.0;
    wsSend = {
        "action": moniMehtod,
        "name": "tinywan",
    };
    $(document).ready(function () {
        //----------WebSocket部分--------------
        var ws = new WebSocket("ws://" + wsServerIP + ":" + wsServerPort);
        ws.onopen = function () {
            ws.send(JSON.stringify(wsSend));
        };
        ws.onclose = function () {
            console.log('链接已断开');
            ws.close();
        };
        ws.onmessage = function (e) {
            var response = JSON.parse(e.data);
            if (Number(response.errcode) !== 0) {
                console.log(String(response.errmsg));
                ws.close();
                alert('出错啦!' + String(response.errmsg));
                return;
            }
            var divisor = 1;
            switch (moniDataUnit.toLocaleLowerCase()) {
                case 'mb':
                    divisor = 1024;
                    break;
            }
            wsData = response.data / divisor;
            console.log("收到服务端的消息：" + wsData);
        };

        //----------highcharts的图标插件部分--------------
        Highcharts.setOptions({
            global: {
                useUTC: false
            }
        });

        $('#container').highcharts({
            chart: {
                type: 'spline',
                animation: Highcharts.svg, // don't animate in old IE
                marginRight: 10,
                events: {
                    load: function () {
                        // set up the updating of the chart each second
                        var series = this.series[0];
                        setInterval(function () {
                            // current time
                            var x = (new Date()).getTime(),
                                y = wsData * 1.00;
                            series.addPoint([x, y], true, true);
                        }, 2000);
                    }
                }
            },
            title: {
                text: '服务器【' + moniServerIp + '】内存指标(单位:' + moniDataUnit + ')'
            },
            xAxis: {
                type: 'datetime',
                tickPixelInterval: 150
            },
            yAxis: {
                title: {
                    text: 'MemFree'
                },
                plotLines: [{
                    value: 0,
                    width: 1,
                    color: '#808080'
                }]
            },
            tooltip: {
                formatter: function () {
                    return '<b>' + this.series.name + '</b><br/>' +
                        Highcharts.dateFormat('%Y-%m-%d %H:%M:%S', this.x) + '<br/>' +
                        Highcharts.numberFormat(this.y, 2);
                }
            },
            legend: {
                enabled: false
            },
            exporting: {
                enabled: false
            },
            series: [{
                name: 'MemFree指标',
                data: (function () {
                    // generate an array
                    var data = [],
                        time = (new Date()).getTime(),
                        i;
                    for (i = -19; i <= 0; i += 1) {
                        data.push({
                            x: time + i * 1000,
                            y: wsData
                        });
                    }
                    return data;
                }())
            }]
        });
    });
</script>
<script src="http://apps.bdimg.com/libs/jquery/2.1.4/jquery.min.js"></script>
<script src="http://code.highcharts.com/highcharts.js"></script>

3、测试结果：

4、客户端可能会出现超时链接的，可以使用 ReconnectingWebSocket

 var ws = new ReconnectingWebSocket("ws://" + wsServerIP + ":" + wsServerPort);

》》》》》》》》》》》》参数详解

（1）参数一：--staticdir=.

--staticdir=.  Allow websocketd to serve count.html as a static file
//允许websocketd作为静态文件提供count.html

这个参数是什么意思来，就是在当前项目指定通知执行的语言脚本文件(count.sh)同名的count.html作为静态文件，直接使用http访问

当前目录

count.sh 文件（tinywan@tinywan:~/Go/websocket$ cat count.sh）

#!/bin/bash
# Count from 1 to 10, pausing for a second between each iteration.
for COUNT in $(seq 1 10); do
  echo $COUNT
  sleep 1
done

count.html 文件

<!DOCTYPE html>
<html>
  <head>
    <title>websocketd count example</title>
    <style>
      #count {
        font: bold 150px arial;
        margin: auto;
        padding: 10px;
        text-align: center;
      }
    </style>
  </head>
  <body>

    <div id="count"></div>

    <script>
      var ws = new WebSocket('ws://192.168.18.180:8080/');
      ws.onopen = function() {
        document.body.style.backgroundColor = '#cfc';
      };
      ws.onclose = function() {
        document.body.style.backgroundColor = null;
      };
      ws.onmessage = function(event) {
        document.getElementById('count').textContent = event.data;
      };
    </script>

  </body>
</html>

打开谷歌浏览器，在地址栏输入：http://192.168.18.180:8080/

点击count.html后的效果图

（2）参数二： --devconsole

　　该--devconsole标志使内置的控制台websocketd与WebSocket端点手动交互。

　　指向浏览器http://localhost:8080/，您将看到控制台。按复选框连接。

请注意，您不能同时使用--devconsole和--staticdir。开发控制台旨在提供临时用户界面，直到您构建了真实的用户界面。

开始测试：

打开浏览器测试，发送一个空数据是没办法发送的，由于我们没有指定开启那个一个语言脚本文件充当WebSocket 服务器，为我们提供客户端的服务

指定/home/tinywan/Go/websocket 目录下的 count.sh 作为服务文件，继续测试的结果如下所示

Websocket 代理服务器

1、没代理之前访问

var ws = new WebSocket('ws://192.168.18.188:63800');
ws.onopen = function() {
    console.log('CONNECT');
};
ws.onclose = function() {
    console.log('DISCONNECT');
};
ws.onmessage = function(event) {
    console.log('MESSAGE: ' + event.data);
};

2、代理之后访问

var ws = new WebSocket('ws://192.168.18.188:8087/chat/');
ws.onopen = function() {
    console.log('CONNECT');
};
ws.onclose = function() {
    console.log('DISCONNECT');
};
ws.onmessage = function(event) {
    console.log('MESSAGE: ' + event.data);
};

守护进程运行

nohup websocketd --port=63800 /home/www/bin/system_info_send_all_websocketd.sh >/dev/null  2>&1 &

加载证书

 sudo websocketd --port=6500 --ssl --sslcert="/etc/letsencrypt/live/www.tinywan.top/fullchain.pem" --

sslkey="/etc/letsencrypt/live/www.tinywan.top//privkey.pem" /home/www/bin/system_info_send_all_websocketd.s

wss 协议测试

var ws = new WebSocket('wss://www.tinywan.top:6500');
ws.onopen = function() {
    console.log('CONNECT');
};
ws.onclose = function() {
    console.log('DISCONNECT');
};
ws.onmessage = function(event) {
    console.log('MESSAGE: ' + event.data);
};

Github 开源项目（一）websocketd （实战：实时监控服务器内存信息）

一、安装：websocketd

二、开启WebSocketd 服务

》》》实际案例，使用WebSocketd 实时监控内存信息

》》》》》》》》》》》》参数详解

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Github 开源项目（一）websocketd （实战：实时监控服务器内存信息）

一、安装：websocketd

二、开启WebSocketd 服务

》》》实际案例，使用WebSocketd 实时监控内存信息

》》》》》》》》》》》》 参数详解

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》》》》》》》》》》》》参数详解