119 lines
4.0 KiB
C#
119 lines
4.0 KiB
C#
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using Newtonsoft.Json;
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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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public static class HttpService
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{
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// 单例 HttpClient，避免端口耗尽
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private static readonly HttpClient _client;
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// 【关键】日志事件，UI层订阅这个事件来显示日志
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public static event Action<ApiLogEntry> OnApiLog;
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static HttpService()
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{
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_client = new HttpClient();
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// 设置一个合理的超时，避免界面卡死
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_client.Timeout = TimeSpan.FromSeconds(5);
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}
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/// <summary>
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/// 泛型 GET 方法
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/// </summary>
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public static async Task<T> GetAsync<T>(string url)
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{
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return await ExecuteRequestAsync<T>(new HttpRequestMessage(HttpMethod.Get, url));
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}
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/// <summary>
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/// 泛型 POST 方法
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/// </summary>
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public static async Task<T> PostAsync<T>(string url, object data)
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{
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var request = new HttpRequestMessage(HttpMethod.Post, url);
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string json = JsonConvert.SerializeObject(data);
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request.Content = new StringContent(json, Encoding.UTF8, "application/json");
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return await ExecuteRequestAsync<T>(request, json);
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}
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/// <summary>
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/// 专门用于【连通性测试】的方法 (不关心返回值内容，只关心通不通)
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/// </summary>
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public static async Task<bool> TestConnectionAsync(string url)
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{
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// 复用核心逻辑，但泛型传 string (忽略结果) 或 object
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try
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{
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await ExecuteRequestAsync<string>(new HttpRequestMessage(HttpMethod.Get, url));
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return true;
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}
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catch
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{
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return false;
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}
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}
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// --- 核心执行逻辑 ---
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private static async Task<T> ExecuteRequestAsync<T>(HttpRequestMessage request, string requestBody = "")
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{
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// 1. 准备日志对象
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var log = new ApiLogEntry
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{
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Method = request.Method.ToString(),
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Url = request.RequestUri.ToString(),
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RequestBody = requestBody
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};
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var sw = Stopwatch.StartNew(); // 开始计时
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try
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{
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// 2. 发起网络请求
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var response = await _client.SendAsync(request);
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sw.Stop(); // 停止计时
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log.DurationMs = sw.ElapsedMilliseconds;
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log.StatusCode = (int)response.StatusCode;
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// 3. 读取响应内容
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string content = await response.Content.ReadAsStringAsync();
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log.ResponseBody = content;
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if (response.IsSuccessStatusCode)
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{
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// 如果 T 是 string，直接返回内容，不反序列化
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if (typeof(T) == typeof(string))
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return (T)(object)content;
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// 反序列化 JSON
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return JsonConvert.DeserializeObject<T>(content);
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}
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else
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{
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log.ErrorMessage = $"HTTP {response.StatusCode}: {response.ReasonPhrase}";
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throw new HttpRequestException(log.ErrorMessage);
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}
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}
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catch (Exception ex)
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{
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sw.Stop();
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if (log.DurationMs == 0) log.DurationMs = sw.ElapsedMilliseconds;
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log.StatusCode = 0; // 0 代表网络层面的失败(如断网)
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log.ErrorMessage = ex.Message;
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log.ResponseBody = ex.ToString(); // 记录堆栈以便排查
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throw; // 抛出异常供调用方 UI 处理
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}
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finally
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{
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// 4. 【广播日志】无论成功失败，都触发事件
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// 使用 Invoke 确保 UI 订阅者能收到
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OnApiLog?.Invoke(log);
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}
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}
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}
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}
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