【Azure Developer】App Service + PubSub +JS 实现多人版黑客帝国文字流效果图

来源：互联网收集：自由互联发布时间：2022-05-28

需要描述 1）实现黑客帝国文字流效果图，JS功能 2）部署在云中，让大家都可以访问，App Service实现 3）大家都能发送消息，并显示在文字流中，PubSub（websocket）实现终极效果显示：执

需要描述

1）实现黑客帝国文字流效果图，JS功能

2）部署在云中，让大家都可以访问，App Service实现

3）大家都能发送消息，并显示在文字流中，PubSub（websocket）实现

终极效果显示：

执行步骤

1）在 Azure 中创建 App Service 服务，参考官方文档：快速入门：部署 ASP.NET Web 应用

Azure门户中创建App Service的动画演示：

2）在 Azure 中创建 PubSub 服务，参考官方文档：快速入门：从 Azure 门户创建 Web PubSub 实例

Azure门户中创建Web PubSub的动画演示：

3）使用Visual Studio 2022创建一个.NET 6.0 Web项目，参考PubSub的文档来创建一个服务端来托管 /negotiate API和Web 页面，参考示例：教程：使用子协议在 WebSocket 客户端之间发布和订阅消息

Program.cs文件内容为：

string ConnectionString = "<Web PubSub Access Key>" 获取的办法见第二步创建的PubSub服务的Key页面 --> Connection String

using Azure.Messaging.WebPubSub;
using Microsoft.Extensions.Azure;

string ConnectionString = "<Web PubSub Access Key>";

// Add WebPubSub Service 
var builder = WebApplication.CreateBuilder(args);
builder.Services.AddAzureClients(builder =>
{
    builder.AddWebPubSubServiceClient(ConnectionString, "stream");
});

var app = builder.Build();

app.UseStaticFiles();

app.UseRouting();

//实现生产客户端WebSocket SAS URL
app.UseEndpoints(endpoints =>
{
    endpoints.MapGet("/negotiate/{userid}", async (string userid, HttpContext context) =>
    {
        var service = context.RequestServices.GetRequiredService<WebPubSubServiceClient>();
        var response = new
        {
            url = service.GetClientAccessUri(userId: userid, roles: new string[] { "webpubsub.sendToGroup.stream", "webpubsub.joinLeaveGroup.stream" }).AbsoluteUri
        };
        await context.Response.WriteAsJsonAsync(response);
    });
});

app.MapGet("/", () => "/index.html");

app.Run();

前端 wwwroot/stream.html 内容为：

<html>
<style>
    html,
    body {
        margin: 0;
        padding: 0;
        background-color: rgb(0, 0, 0);
    }

    #divList {
        width: 98%;
        height: 79%;
        border: solid 1px rgb(0, 15, 0);
        ;
        margin: 0px auto;
        overflow: hidden;
        position: relative;
    }

    .divText {
        position: absolute;
    }

    .divText span {
        display: block;
        font-weight: bold;
        font-family: Courier New;
    }
</style>
<script src="https://cdn.staticfile.org/jquery/1.10.2/jquery.min.js"></script>

<body> <br>
    <h2 style="text-align:center; color:white;">STREAM BOARDCAST (<span id="spanCount">0</span>)</h2>
    <div id="divList">
    </div>
    <h3 style="text-align:left; color:grey;">Send</h3>
    <div style=" margin: 5px 15px;">
        <input id="inputmessage" style="text-align:left; color:green; width: 86%; height: 55px; font-size: 40px;" onsubmit="sendmessage()"><button
            style="text-align:center; color:green; width: 12%; height: 55px;font-size: 40px;" onclick="sendmessage()">Send</button>
    </div>
    <div style="display:none;">
        <h1>Message</h1>
        <div id="output"></div>
        <br>
        <h1>Message</h1>
        <div id="outputmsg"></div>
    </div>
    <script>
        var textarray = ["Hello Mooncake,Welcome to use PubSub", "Who are you? Put your PIN ... "];
        var wsurl = "";
        var wsclient;
        let ackId = 0;
        (async function () {
            let res = await fetch('/negotiate/client_2')
            let data = await res.json();
            wsurl = data.url;
            let ws = new WebSocket(data.url, 'json.webpubsub.azure.v1');
            ws.onopen = () => {
                console.log('connected');
            };

            let output = document.querySelector('#output');
            let outputmsg = document.querySelector('#outputmsg');

            ws.onmessage = event => {
                let d = document.createElement('p');
                d.innerText = event.data;
                output.appendChild(d);

                let message = JSON.parse(event.data);
                if (message.type === 'message' && message.group === 'stream') {
                    let d = document.createElement('span');
                    d.innerText = message.data;
                    textarray.push(message.data);
                    outputmsg.appendChild(d);
                    window.scrollTo(0, document.body.scrollHeight);
                }
            };

            ws.onopen = () => {
                console.log('connected');
                ws.send(JSON.stringify({
                    type: 'joinGroup',
                    group: 'stream',
                    ackId: ++ackId
                }));

                wsclient = ws;
            };
        })();


        function sendmessage() {

            if (wsclient.readyStatue == WebSocket.OPEN) {
                wsclient.send(JSON.stringify(
                    {
                        type: "sendToGroup",
                        group: "stream",
                        data: $('#inputmessage').val(),
                        ackId: ++ackId // ackId is optional, use ackId to make sure this action is executed
                    }
                ));
            }
            else { 
                wsclient = new WebSocket(wsurl, 'json.webpubsub.azure.v1');

                wsclient.onopen = () => {
                    console.log('connected again');
                    wsclient.send(JSON.stringify({
                        type: "sendToGroup",
                        group: "stream",
                        data: $('#inputmessage').val(),
                        ackId: ++ackId
                    }));
 
                };
            }
            $('#inputmessage').focus();
        }



        function rand(min, max) {
            return min + Math.round(Math.random() * (max - min));
        }

        function add(message) {
            var maxwdth = $('#divList').width();
            var x = rand(0, maxwdth);
            var html = '<div class="divText" style="left:' + x + 'px; bottom:500px;">';

            var color = [];
            for (var i = 1; i < message.length; i++) {
                var f = i.toString(16);
                color.push('0' + f + '0');
            }

            var fontSize = rand(20, 36);
            for (var i = 1; i <= message.length; i++) {
                var c = message[i - 1];
                html += '<span class="s' + i + '" style="color:#' + color[i - 1] + '; font-size:' + fontSize + 'px; text-shadow:0px 0px 10px #' + color[i - 1] + ';">' + c + '</span>';
            }
            html += '</div>';
            $('#divList').append(html);
        }

        function run() {
            var x = rand(0, 100);
            if (x < 100) {
                var lgh = textarray.length;
                if (textarray.length > x) add(textarray[x]);
                else
                    add(textarray[x % lgh]);
            }
            $('#spanCount').html($('.divText').size());

            $('.divText').each(function () {
                var y = $(this).css('bottom');
                y = parseInt(y);
                y -= $(this).find('span').eq(0).height();
                $(this).css('bottom', '' + y + 'px');
                if (y + $(this).height() <= 0) {
                    $(this).remove();
                    return;
                }
            });

            window.setTimeout(run, 200);
        }
        run();

    </script>
</body>

</html>

项目结构示意图：

项目创建完成后，可以在本机进行调试。正常运行后即可发布到Azure App Service上。因代码简单并且可读性强，可自行理解。

4）通过VS 2022发布到App Service中

VS 2022 通过Publish Profile 发布站点演示动画：

发布版本操作完成。

附录一：本地黑客帝国文字流效果，可自行输入即修改内容版

复制内容，直接保存在本地文件中，文件命名为 localstream.html后使用浏览器打开即可

<html>
<style>
    html,
    body {
        margin: 0;
        padding: 0;
        background-color: rgb(0, 0, 0);
    }

    #divList {
        width: 98%;
        height: 79%;
        border: solid 1px rgb(0, 15, 0);
        ;
        margin: 0px auto;
        overflow: hidden;
        position: relative;
    }

    .divText {
        position: absolute;
    }

    .divText span {
        display: block;
        font-weight: bold;
        font-family: Courier New;
    }
</style>
<script src="https://cdn.staticfile.org/jquery/1.10.2/jquery.min.js"></script>

<body> <br>
    <h2 style="text-align:center; color:white;">STREAM BOARDCAST (<span id="spanCount">0</span>)</h2>
    <div id="divList">
    </div>
    <h3 style="text-align:left; color:grey;">Send</h3>
    <div style=" margin: 5px 15px;">
        <input id="inputmessage" style="text-align:left; color:green; width: 86%; height: 55px; font-size: 40px;" onsubmit="sendmessage()"><button
            style="text-align:center; color:green; width: 12%; height: 55px;font-size: 40px;" onclick="sendmessage()">Send</button>
    </div>
    <div style="display:none;">
        <h1>Message</h1>
        <div id="output"></div>
        <br>
        <h1>Message</h1>
        <div id="outputmsg"></div>
    </div>
    <script>
        var textarray = ["Hello Mooncake,Welcome to use PubSub", "Who are you? Put your PIN ... "];

        function sendmessage() {
            textarray.push($('#inputmessage').val());
            $('#inputmessage').focus();
        }



        function rand(min, max) {
            return min + Math.round(Math.random() * (max - min));
        }

        function add(message) {
            var maxwdth = $('#divList').width();
            var x = rand(0, maxwdth);
            var html = '<div class="divText" style="left:' + x + 'px; bottom:500px;">';

            var color = [];
            for (var i = 1; i < message.length; i++) {
                var f = i.toString(16);
                color.push('0' + f + '0');
            }

            var fontSize = rand(20, 36);
            for (var i = 1; i <= message.length; i++) {
                var c = message[i - 1];
                html += '<span class="s' + i + '" style="color:#' + color[i - 1] + '; font-size:' + fontSize + 'px; text-shadow:0px 0px 10px #' + color[i - 1] + ';">' + c + '</span>';
            }
            html += '</div>';
            $('#divList').append(html);
        }

        function run() {
            var x = rand(0, 100);
            if (x < 100) {
                var lgh = textarray.length;
                if (textarray.length > x) add(textarray[x]);
                else
                    add(textarray[x % lgh]);
            }
            $('#spanCount').html($('.divText').size());

            $('.divText').each(function () {
                var y = $(this).css('bottom');
                y = parseInt(y);
                y -= $(this).find('span').eq(0).height();
                $(this).css('bottom', '' + y + 'px');
                if (y + $(this).height() <= 0) {
                    $(this).remove();
                    return;
                }
            });

            window.setTimeout(run, 200);
        }
        run();

    </script>
</body>

</html>

PS: 与PubSub版本相比，只是移除了WebSocket的相关代码

运行效果

参考资料

JS 黑客帝国文字下落效果： https://www.cnblogs.com/zjfree/p/3833592.html

快速入门：部署 ASP.NET Web 应用：https://docs.azure.cn/zh-cn/app-service/quickstart-dotnetcore?tabs=net60&pivots=development-environment-vs

当在复杂的环境中面临问题，格物之道需：浊而静之徐清，安以动之徐生。云中，恰是如此!

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