最新问题 - 第46页

Mcile

Asked: 2025-03-06 18:47:37 +0000 UTC

css 中的双滑块如何制作？

5

当我连续添加 2 个滑块时，它们之间会有间隙，但如果我将它们重叠，则下面的滑块无法使用

.range-wrapper {
  display: flex;
  align-items: center;
  position: relative;
  height: 34px;
  margin-top: 20px;
}

[type="range"] {
  position: absolute;
}

<div class="range-wrapper" data-already-init="1">
  <input class="custom-range" type="range" min="4235" max="14835" step="100" value="4235">
  <input class="custom-range" type="range" min="4235" max="14835" step="100" value="14835">
</div>

HeAVeN

Asked: 2025-03-06 16:37:42 +0000 UTC

分布式系统中主节点与工作节点之间的连接错误

4

我正在 ASP.NET 和 Docker 上建立一个分布式系统，计算给定范围内的素数。我有一个中央主节点和 3 个工作节点，我为它们提供了一些计算范围。我无法连接到他们。我遇到了连接错误。有什么问题？来自浏览器的日志：

Sending request: 
Object { start: "1", end: "500" }

end: "500"

start: "1"

<prototype>: Object { … }
index.html:27:21
Data: 
Object { error: "Internal Server Error", logs: (6) […] }

error: "Internal Server Error"

logs: Array(6) [ "Start processing request on master", "Received request: start=1, end=500", "Assigning worker 1: 1 - 167", … ]

0: "Start processing request on master"

1: "Received request: start=1, end=500"

2: "Assigning worker 1: 1 - 167"

3: "Assigning worker 2: 167 - 333"

4: "Assigning worker 3: 333 - 500"

5: "Error: System.Net.Http.HttpRequestException: Connection refused (worker1:8081)\n ---> System.Net.Sockets.SocketException (111): Connection refused\n   at System.Net.Sockets.Socket.AwaitableSocketAsyncEventArgs.ThrowException(SocketError error, CancellationToken cancellationToken)\n   at System.Net.Sockets.Socket.AwaitableSocketAsyncEventArgs.System.Threading.Tasks.Sources.IValueTaskSource.GetResult(Int16 token)\n   at System.Net.Sockets.Socket.<ConnectAsync>g__WaitForConnectWithCancellation|285_0(AwaitableSocketAsyncEventArgs saea, ValueTask connectTask, CancellationToken cancellationToken)\n   at System.Net.Http.HttpConnectionPool.ConnectToTcpHostAsync(String host, Int32 port, HttpRequestMessage initialRequest, Boolean async, CancellationToken cancellationToken)\n   --- End of inner exception stack trace ---\n   at System.Net.Http.HttpConnectionPool.ConnectToTcpHostAsync(String host, Int32 port, HttpRequestMessage initialRequest, Boolean async, CancellationToken cancellationToken)\n   at System.Net.Http.HttpConnectionPool.ConnectAsync(HttpRequestMessage request, Boolean async, CancellationToken cancellationToken)\n   at System.Net.Http.HttpConnectionPool.CreateHttp11ConnectionAsync(HttpRequestMessage request, Boolean async, CancellationToken cancellationToken)\n   at System.Net.Http.HttpConnectionPool.AddHttp11ConnectionAsync(QueueItem queueItem)\n   at System.Threading.Tasks.TaskCompletionSourceWithCancellation`1.WaitWithCancellationAsync(CancellationToken cancellationToken)\n   at System.Net.Http.HttpConnectionPool.SendWithVersionDetectionAndRetryAsync(HttpRequestMessage request, Boolean async, Boolean doRequestAuth, CancellationToken cancellationToken)\n   at System.Net.Http.DiagnosticsHandler.SendAsyncCore(HttpRequestMessage request, Boolean async, CancellationToken cancellationToken)\n   at System.Net.Http.RedirectHandler.SendAsync(HttpRequestMessage request, Boolean async, CancellationToken cancellationToken)\n   at System.Net.Http.HttpClient.<SendAsync>g__Core|83_0(HttpRequestMessage request, HttpCompletionOption completionOption, CancellationTokenSource cts, Boolean disposeCts, CancellationTokenSource pendingRequestsCts, CancellationToken originalCancellationToken)\n   at Program.<<Main>$>g__SendToWorker|0_3(Int32 workerIndex, BigInteger start, BigInteger end) in /src/Program.cs:line 122\n   at Program.<>c.<<<Main>$>b__0_1>d.MoveNext() in /src/Program.cs:line 51"

length: 6

<prototype>: Array []

<prototype>: Object { … }
index.html:37:25
Uncaught (in promise) TypeError: data.Primes is undefined
    <anonymous> http://localhost:8080/index.html:38
index.html:38:32

index.html（位于 wwwroot 中）：

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Prime Number Finder</title>
</head>
<body>
    <h1>Prime Number Finder</h1>
    <form id="primeForm">
        <label for="start">Start:</label>
        <input type="number" id="start" name="start" required>
        <label for="end">End:</label>
        <input type="number" id="end" name="end" required>
        <button type="submit">Find Primes</button>
    </form>

    <div id="result"></div>

    <script>
        document.getElementById('primeForm').addEventListener('submit', async function (event) {
            event.preventDefault();

            const start = parseInt(document.getElementById('start').value, 10);  // Преобразуем в число
            const end = parseInt(document.getElementById('end').value, 10);  // Преобразуем в число

            console.log("Sending request:", { start, end });  // Лог запроса

            const response = await fetch("/api/master/start", {
                method: "POST",
                headers: { "Content-Type": "application/json" },
                body: JSON.stringify({ start: start, end: end })  // Передаем числа, а не строки
            });

            if (response.ok) {
                const data = await response.json();
                console.log("Data:", data);
                const primes = data.Primes.join(', ');
                document.getElementById('result').innerText = 'Primes: ' + primes;
            } else {
                document.getElementById('result').innerText = 'Error retrieving primes.';
            }
        });

    </script>
</body>
</html>

Dockerfile：

FROM mcr.microsoft.com/dotnet/aspnet:8.0 AS base
WORKDIR /app
EXPOSE 80

FROM mcr.microsoft.com/dotnet/sdk:8.0 AS build
WORKDIR /src
COPY ["DistributedSystems_Lab1.csproj", ""]
RUN dotnet restore "./DistributedSystems_Lab1.csproj"
COPY . .
RUN dotnet publish "DistributedSystems_Lab1.csproj" -c Release -o /app/publish

FROM base AS final
WORKDIR /app
COPY --from=build /app/publish .
ENTRYPOINT ["dotnet", "DistributedSystems_Lab1.dll"]

Docker-compose.yml：

services:
  master:
    container_name: master
    image: my_app:latest
    environment:
      - ROLE=master
    ports:
      - "8080:8080"
    networks:
      - app_net
    deploy:
      replicas: 1
      restart_policy:
        condition: on-failure
    depends_on:
      - worker1
      - worker2
      - worker3

  worker1:
    container_name: worker1
    image: my_app:latest
    environment:
      - ROLE=worker
    networks:
      - app_net
    ports:
      - "8081:8080"  
    deploy:
      restart_policy:
        condition: on-failure

  worker2:
    container_name: worker2
    image: my_app:latest
    environment:
      - ROLE=worker
    networks:
      - app_net
    ports:
      - "8082:8080"  
    deploy:
      restart_policy:
        condition: on-failure

  worker3:
    container_name: worker3
    image: my_app:latest
    environment:
      - ROLE=worker
    networks:
      - app_net
    ports:
      - "8083:8080"  
    deploy:
      restart_policy:
        condition: on-failure

networks:
  app_net:
    driver: bridge

PrimalityTest.cs：

using System.Numerics;

namespace DistributedSystems_Lab1
{
    public static class PrimalityTest
    {
        // Проверка числа на простоту
        public static bool IsPrime(BigInteger number)
        {
            if (number < 2) return false;

            // Вычисление целочисленного квадратного корня числа
            BigInteger sqrt = Sqrt(number);
            for (BigInteger i = 2; i <= sqrt; i++)
            {
                if (number % i == 0) return false;
            }

            return true;
        }

        // Функция для вычисления целочисленного квадратного корня BigInteger
        public static BigInteger Sqrt(BigInteger value)
        {
            if (value < 0) throw new ArgumentException("value must be non-negative");

            BigInteger x = value;
            BigInteger y = (x + 1) / 2;

            // Итеративный метод Ньютона для приближения
            while (y < x)
            {
                x = y;
                y = (x + value / x) / 2;
            }

            return x;
        }
    }
}

PrimeCheckRequest.cs：

namespace DistributedSystems_Lab1
{
    public class PrimeCheckRequest
    {
        public BigInteger Start { get; set; }
        public BigInteger End { get; set; }
    }
}

PrimeCheckResponse.cs：

 namespace DistributedSystems_Lab1
{
    public class PrimeCheckResponse
    {
        public List<string> Primes { get; set; } = new();
    }
}

PrimeController.cs：

namespace DistributedSystems_Lab1
{
    using Microsoft.AspNetCore.Mvc;
    using System.Collections.Generic;
    using System.Numerics;

    [ApiController]
    [Route("api/[controller]")]
    public class PrimeController : ControllerBase
    {
        [HttpPost("check")]
        public ActionResult<PrimeCheckResponse> CheckPrimes([FromBody] PrimeCheckRequest request)
        {
            BigInteger start = BigInteger.Parse(request.Start);
            BigInteger end = BigInteger.Parse(request.End);
            List<string> primes = new();

            for (BigInteger i = start; i <= end; i++)
            {
                if (PrimalityTest.IsPrime(i))
                {
                    primes.Add(i.ToString());
                }
            }

            return new PrimeCheckResponse { Primes = primes };
        }
    }
}

程序.cs：

using DistributedSystems_Lab1;
using Microsoft.AspNetCore.Builder;
using Microsoft.AspNetCore.Http;
using Microsoft.Extensions.Hosting;
using System.Net.Http.Json;
using System.Numerics;
using System.Text.Json;

var builder = WebApplication.CreateBuilder(args);
var app = builder.Build();

string role = Environment.GetEnvironmentVariable("ROLE") ?? "worker";

if (role == "master")
{
    app.UseStaticFiles(); // Разрешает отдавать статические файлы
    app.MapGet("/", () => Results.Redirect("/index.html")); // Перенаправляем на страницу с формой

    // Эндпоинт для старта вычислений простых чисел
    app.MapPost("/api/master/start", async (HttpContext context) =>
    {
        List<string> logs = new();
        logs.Add("Start processing request on master");

        try
        {
            var request = await context.Request.ReadFromJsonAsync<PrimeCheckRequest>();
            if (request == null)
            {
                logs.Add("Invalid request received");
                return Results.Json(new { Error = "Invalid request", Logs = logs });
            }

            BigInteger start = request.Start;  // Теперь это уже BigInteger
            BigInteger end = request.End;

            int workerCount = 3;
            BigInteger step = (end - start) / workerCount;
            List<Task<(List<string> primes, List<string> workerLogs)>> tasks = new();

            logs.Add($"Received request: start={start}, end={end}");

            for (int i = 0; i < workerCount; i++)
            {
                BigInteger subStart = start + i * step;
                BigInteger subEnd = (i == workerCount - 1) ? end : subStart + step;

                logs.Add($"Assigning worker {i + 1}: {subStart} - {subEnd}");
                tasks.Add(SendToWorker(i, subStart, subEnd));
            }

            var results = await Task.WhenAll(tasks);
            var primes = results.SelectMany(x => x.primes).ToList();
            logs.AddRange(results.SelectMany(x => x.workerLogs));

            logs.Add("End processing request on master");
            return Results.Json(new { Primes = primes, Logs = logs });
        }
        catch (Exception ex)
        {
            logs.Add($"Error: {ex}");
            return Results.Json(new { Error = "Internal Server Error", Logs = logs });
        }
    });


}
else
{
    // Эндпоинт для обработки вычислений простых чисел на воркере
    app.MapPost("/api/worker/check", async (HttpContext context) =>
    {
        List<string> logs = new();
        logs.Add("Worker processing started");

        var request = await context.Request.ReadFromJsonAsync<PrimeCheckRequest>();
        if (request == null)
        {
            logs.Add("Invalid request received");
            logs.Add("Worker processing finished with error");
            return Results.Json(new { Error = "Invalid request", Logs = logs });
        }

        BigInteger start = BigInteger.Parse(request.Start.ToString());
        BigInteger end = BigInteger.Parse(request.End.ToString());
        List<string> primes = new();

        logs.Add($"Worker received: start={start}, end={end}");

        for (BigInteger i = start; i <= end; i++)
        {
            if (PrimalityTest.IsPrime(i))
            {
                primes.Add(i.ToString());
            }
        }

        logs.Add($"Worker found primes: {string.Join(", ", primes)}");
        logs.Add("Worker processing finished");

        return Results.Json(new { Primes = primes, Logs = logs });
    });

}

app.Run();

// Отправка задания на воркер
static async Task<(List<string> primes, List<string> workerLogs)> SendToWorker(int workerIndex, BigInteger start, BigInteger end)
{
    using var client = new HttpClient();
    var workerUrls = new[]
    {
        "http://worker1:8081",
        "http://worker2:8082",
        "http://worker3:8083"
    };

    List<string> logs = new();
    string workerUrl = workerUrls[workerIndex % workerUrls.Length];

    logs.Add($"Start sending request to {workerUrl}: start={start}, end={end}");

    var response = await client.PostAsJsonAsync($"{workerUrl}/api/worker/check", new PrimeCheckRequest
    {
        Start = start,
        End = end
    });

    if (!response.IsSuccessStatusCode)
    {
        logs.Add($"Worker request failed: {response.StatusCode}");
        logs.Add($"End sending request to {workerUrl}");
        return (new List<string>(), logs);
    }

    var result = await response.Content.ReadFromJsonAsync<PrimeCheckResponse>();
    logs.Add($"Worker {workerUrl} returned: {string.Join(", ", result?.Primes ?? new List<string>())}");
    logs.Add($"End sending request to {workerUrl}");

    return (result?.Primes ?? new List<string>(), logs);
}

Питер Пен

Asked: 2025-03-06 15:01:51 +0000 UTC

如何在 Godot 引擎中创建麦克风音量变量？

5

我想在 Godot 中制作一款赛车游戏，玩家使用屏幕上的按钮控制汽车，并使用声音加速和减速 - 如果他大声说话，汽车就会加速，如果他小声说话，汽车就会刹车。我如何知道当前的音量？

Дмитрий Алёхин

Asked: 2025-03-06 00:02:07 +0000 UTC

在 JavaScript 中递归迭代数组

5

const data = {
    group: "Group1",
    attributes: { name: "Item1" },
    children: [
        { attributes: { name: "SubItem1" } },
        { attributes: { name: "SubItem2" } },
        {
            group: "Group2",
            attributes: { name: "Item2" },
            children: [{ attributes: { name: "SubItem3" } }, { attributes: { name: "SubItem4" } }],
        },
    ],
};

结果

{
Group1: [Item1,SubItem1,SubItem2, Item2,SubItem3,SubItem4],
Group2: [Item2,SubItem3,SubItem4]
}

数组中的顺序并不重要。

Niqq

Asked: 2025-03-05 21:46:02 +0000 UTC

为什么 VS 会给出警告 C6386（缓冲区溢出）？

4

#include <iostream>

struct String
{
public:
  String();
  String(const char *str);
  String(const String& str);
  void print();
  ~String();
  String& operator=(const String& other);
  String operator+(const String& other);

private:
  char *str;
  int lenght;
};

String::String()
{
  this->str = nullptr;
  lenght = 0;
}

String::String(const char *str)
{
  lenght = strlen(str);
  this->str = new char[lenght + 1];

  for(int i = 0; i < lenght; i++)
  {
    this->str[i] = str[i];
  }
  this->str[lenght] = '\0';
}

String::String(const String& other)
{
  
  lenght = other.lenght;
  this->str = new char[lenght + 1];
  for (int i = 0; i < lenght; i++)
  {
    this->str[i] = other.str[i];
  }
  this->str[other.lenght] = '\0';
}

void String::print()
{
  std::cout << str;
}



String::~String()
{
  delete[] this->str;
  this->str = nullptr;
}

String& String::operator=(const String& other)
{
  if (this->str != nullptr)
  {
    delete[] str;
    str = nullptr;
  }

  lenght = other.lenght;
  this->str = new char[lenght + 1];
  for (int i = 0; i < lenght; i++)
  {
    this->str[i] = other.str[i];
  }
  this->str[other.lenght] = '\0';

  return *this;
}

String String::operator+(const String& other)
{

  String NewStr;
  NewStr.lenght = this->lenght + other.lenght;
  NewStr.str  = new char[NewStr.lenght + 1];
  
  int i = 0;
  for (;i < this->lenght; i++)
  {
    NewStr.str[i] = this->str[i];
  }
  for (int j = 0; j < other.lenght; j++, i++)
  {
    NewStr.str[i] = other.str[j];//предупреждение в этой строке
  }
  NewStr.str[NewStr.lenght] = '\0';
  

  return NewStr;
}

int main()
{
  String a("Hello");
  String b("lello");
  String c;
  c = a + b;


  c.print();
}

更换时

NewStr.lenght = this->lenght + other.lenght;
      NewStr.str  = new char[NewStr.lenght + 1];

在

NewStr.lenght = this->lenght + other.lenght;
      NewStr.str  = new char[this->lenght + other.lenght + 1];

警告消失

css 中的双滑块如何制作？

分布式系统中主节点与工作节点之间的连接错误

如何在 Godot 引擎中创建麦克风音量变量？

在 JavaScript 中递归迭代数组

为什么 VS 会给出警告 C6386（缓冲区溢出）？

我看不懂措辞

请求的模块“del”不提供名为“default”的导出

"!+tab" 在 HTML 的 vs 代码中不起作用

我正在尝试解决“猜词”的问题。Python

可以使用哪些命令将当前指针移动到指定的提交而不更改工作目录中的文件？

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