具备界面基础功能
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299
SHH.CameraDashboard/Services/WebApis/WebApiService.cs
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299
SHH.CameraDashboard/Services/WebApis/WebApiService.cs
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using Newtonsoft.Json;
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using Newtonsoft.Json.Linq;
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using System.Diagnostics;
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using System.Net.Http;
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using System.Text;
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namespace SHH.CameraDashboard
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{
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/// <summary>
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/// 全局 Web API 服务
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/// 职责：
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/// 1. 统一管理 HttpClient 实例，避免资源耗尽。
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/// 2. 封装标准的 CRUD (GET, POST, PUT, DELETE, PATCH) 操作。
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/// 3. 提供详细的请求日志（耗时、状态码、请求/响应内容）。
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/// 4. 处理超时和异常，提供一致的错误处理机制。
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/// </summary>
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public class WebApiService
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{
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#region --- 静态成员 ---
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/// <summary>
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/// WebAPI 设为单例
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/// </summary>
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public static WebApiService Instance { get; } = new WebApiService();
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/// <summary>
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/// 静态 HttpClient 实例。
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/// 最佳实践：应用程序应共享单个 HttpClient 实例以避免套接字耗尽。
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/// </summary>
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private static readonly HttpClient _client;
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#endregion
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#region --- 实例成员 ---
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/// <summary>
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/// 当一个请求完成（无论成功或失败）时发生。
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/// 可用于记录详细的 API 调用日志。
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/// </summary>
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public event Action<LogWebApiModel>? OnRequestCompleted;
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/// <summary>
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/// 日志内容的最大长度（5KB），防止过大的响应体撑爆内存。
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/// </summary>
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private const int MAX_LOG_LENGTH = 5120;
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#endregion
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#region --- 构造函数 ---
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/// <summary>
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/// 构造函数
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/// </summary>
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private WebApiService()
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{
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}
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/// <summary>
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/// 静态构造函数，用于初始化 HttpClient。
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/// </summary>
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static WebApiService()
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{
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// 配置 HttpClient 处理器
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var handler = new SocketsHttpHandler
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{
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// 设置连接池寿命为 15 分钟。
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// 这有助于解决 DNS 变更后，HttpClient 仍使用旧 IP 的问题。
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PooledConnectionLifetime = TimeSpan.FromMinutes(15)
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};
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_client = new HttpClient(handler)
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{
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// 设置默认请求超时时间为 15 秒。
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Timeout = TimeSpan.FromSeconds(15)
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};
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}
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#endregion
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#region --- 核心 CRUD 方法 ---
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/// <summary>
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/// 发送一个 GET 请求。
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/// </summary>
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/// <param name="url">请求的完整 URL。</param>
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/// <param name="moduleName">发起请求的模块名称，用于日志分类。</param>
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/// <param name="token">用于取消操作的令牌。</param>
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/// <returns>成功时返回响应内容的字符串表示。</returns>
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public async Task<string> GetAsync(string url, string moduleName = "System", CancellationToken token = default, bool isAutoPost = false)
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{
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return await ExecuteRequestAsync(url, "GET", null, moduleName, token, async () =>
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{
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return await _client.GetAsync(url, token);
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}, isAutoPost);
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}
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/// <summary>
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/// 发送一个 POST 请求。
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/// </summary>
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/// <param name="url">请求的完整 URL。</param>
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/// <param name="jsonBody">请求体的 JSON 字符串。</param>
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/// <param name="moduleName">发起请求的模块名称，用于日志分类。</param>
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/// <param name="token">用于取消操作的令牌。</param>
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/// <returns>成功时返回响应内容的字符串表示。</returns>
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public async Task<string> PostAsync(string url, string jsonBody, string moduleName = "System", CancellationToken token = default)
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{
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return await ExecuteRequestAsync(url, "POST", jsonBody, moduleName, token, async () =>
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{
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using var content = CreateJsonContent(jsonBody);
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return await _client.PostAsync(url, content, token);
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});
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}
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/// <summary>
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/// 发送一个 PUT 请求（通常用于替换整个资源）。
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/// </summary>
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/// <param name="url">请求的完整 URL。</param>
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/// <param name="jsonBody">请求体的 JSON 字符串。</param>
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/// <param name="moduleName">发起请求的模块名称，用于日志分类。</param>
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/// <param name="token">用于取消操作的令牌。</param>
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/// <returns>成功时返回响应内容的字符串表示。</returns>
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public async Task<string> PutAsync(string url, string jsonBody, string moduleName = "System", CancellationToken token = default)
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{
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return await ExecuteRequestAsync(url, "PUT", jsonBody, moduleName, token, async () =>
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{
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using var content = CreateJsonContent(jsonBody);
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return await _client.PutAsync(url, content, token);
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});
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}
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/// <summary>
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/// 发送一个 PATCH 请求（通常用于更新资源的部分属性）。
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/// </summary>
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/// <param name="url">请求的完整 URL。</param>
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/// <param name="jsonBody">请求体的 JSON 字符串。</param>
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/// <param name="moduleName">发起请求的模块名称，用于日志分类。</param>
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/// <param name="token">用于取消操作的令牌。</param>
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/// <returns>成功时返回响应内容的字符串表示。</returns>
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public async Task<string> PatchAsync(string url, string jsonBody, string moduleName = "System", CancellationToken token = default)
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{
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return await ExecuteRequestAsync(url, "PATCH", jsonBody, moduleName, token, async () =>
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{
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using var content = CreateJsonContent(jsonBody);
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return await _client.PatchAsync(url, content, token);
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});
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}
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/// <summary>
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/// 发送一个 DELETE 请求。
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/// </summary>
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/// <param name="url">请求的完整 URL。</param>
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/// <param name="moduleName">发起请求的模块名称，用于日志分类。</param>
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/// <param name="token">用于取消操作的令牌。</param>
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/// <returns>成功时返回响应内容的字符串表示。</returns>
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public async Task<string> DeleteAsync(string url, string moduleName = "System", CancellationToken token = default)
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{
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return await ExecuteRequestAsync(url, "DELETE", null, moduleName, token, async () =>
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{
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return await _client.DeleteAsync(url, token);
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});
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}
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#endregion
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#region --- 私有辅助方法 ---
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/// <summary>
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/// 创建一个 UTF-8 编码的 JSON 内容对象。
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/// </summary>
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private StringContent CreateJsonContent(string json)
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{
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return new StringContent(json ?? "", Encoding.UTF8, "application/json");
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}
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/// <summary>
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/// 核心执行引擎，封装了所有 HTTP 请求的通用逻辑：计时、日志、异常处理。
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/// </summary>
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private async Task<string> ExecuteRequestAsync(
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string url,
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string method,
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string? requestData,
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string moduleName,
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CancellationToken token,
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Func<Task<HttpResponseMessage>> action,
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bool isAutoPost = false)
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{
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if (requestData == null)
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requestData = "(请求数据为空)";
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var log = new LogWebApiModel
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{
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Time = DateTime.Now,
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Method = method,
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Url = url,
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RequestData = TruncateLog(requestData),
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AppModule = moduleName,
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IsAutoPost = isAutoPost,
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};
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var sw = Stopwatch.StartNew();
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try
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{
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// 执行具体的 HTTP 请求
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using var response = await action();
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// 读取响应内容
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var responseString = await response.Content.ReadAsStringAsync(token);
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// 更新日志
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log.StatusCode = ((int)response.StatusCode).ToString();
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log.ResponseData = TruncateLog(responseString);
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// 如果 HTTP 状态码不是 2xx，则抛出异常
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response.EnsureSuccessStatusCode();
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return responseString;
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}
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catch (Exception ex)
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{
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// 捕获所有异常，更新日志状态为 "Error"
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log.StatusCode = "Error";
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log.ResponseData = $"Client Exception: {ex.Message}";
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// 重新抛出异常，让调用者知道请求失败
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throw;
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}
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finally
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{
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// 无论成功或失败，都记录耗时并触发日志事件
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sw.Stop();
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log.ElapsedMilliseconds = sw.ElapsedMilliseconds;
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// 安全地触发事件，防止订阅者抛出异常影响主线程
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try
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{
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OnRequestCompleted?.Invoke(log);
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}
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catch (Exception logEx)
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{
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// 记录日志系统自身的错误，但不中断程序
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Debug.WriteLine($"Log System Error: {logEx.Message}");
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}
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}
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}
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/// <summary>
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/// 截断过长的日志内容，并尝试格式化 JSON 以便阅读。
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/// </summary>
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private string TruncateLog(string? content)
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{
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if (string.IsNullOrEmpty(content)) return string.Empty;
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// 1. 【新增步骤】尝试将内容格式化为漂亮的 JSON
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// 注意：格式化会增加空格和换行，导致长度变长，这是符合预期的
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string finalContent = TryFormatJson(content);
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// 2. 截断逻辑 (基于格式化后的长度)
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if (finalContent.Length > MAX_LOG_LENGTH)
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{
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// 保留前 N 个字符，并在末尾添加提示
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return finalContent.Substring(0, MAX_LOG_LENGTH) +
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$"\r\n\r\n... [日志过长已截断，显示前 {MAX_LOG_LENGTH} 字符]";
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}
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return finalContent;
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}
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/// <summary>
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/// 尝试将字符串解析并格式化为缩进的 JSON。
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/// 如果解析失败（说明不是 JSON），则原样返回。
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/// </summary>
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private string TryFormatJson(string content)
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{
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// 简单的性能优化：如果不像 JSON（不以 { 或 [ 开头），直接跳过
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var trimmed = content.Trim();
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if ((trimmed.StartsWith("{") && trimmed.EndsWith("}")) ||
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(trimmed.StartsWith("[") && trimmed.EndsWith("]")))
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{
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try
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{
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// 使用 JToken 解析，它可以处理 Object {} 和 Array []
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var token = JToken.Parse(content);
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// 格式化输出 (Indented = 缩进模式)
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return token.ToString(Formatting.Indented);
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}
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catch
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{
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// 解析失败（可能只是普通的文本消息，或者 HTML），忽略异常，返回原样
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return content;
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}
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}
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return content;
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}
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#endregion
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}
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}
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