359 lines
11 KiB
C#
359 lines
11 KiB
C#
namespace WebApi.Controllers;
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[ApiController]
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[Route("api/[controller]/[action]")]
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public class LogController(ILogger<LogController> logger) : ControllerBase
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{
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/// <summary>
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/// 获取日志列表（分页）
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/// </summary>
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[HttpGet]
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public async Task<PagedResponse<LogEntry>> GetListAsync(
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[FromQuery] int pageIndex = 1,
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[FromQuery] int pageSize = 50,
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[FromQuery] string? searchKeyword = null,
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[FromQuery] string? logLevel = null,
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[FromQuery] string? date = null
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)
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{
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try
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{
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// 获取日志目录
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var logDirectory = Path.Combine(Directory.GetCurrentDirectory(), "logs");
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if (!Directory.Exists(logDirectory))
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{
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return new PagedResponse<LogEntry>
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{
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Success = true,
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Data = [],
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Total = 0,
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Message = "日志目录不存在"
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};
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}
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// 确定要读取的日志文件
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string logFilePath;
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if (!string.IsNullOrEmpty(date))
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{
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logFilePath = Path.Combine(logDirectory, $"log-{date}.txt");
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}
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else
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{
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// 默认读取今天的日志
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var today = DateTime.Now.ToString("yyyyMMdd");
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logFilePath = Path.Combine(logDirectory, $"log-{today}.txt");
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}
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// 检查文件是否存在
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if (!System.IO.File.Exists(logFilePath))
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{
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return new PagedResponse<LogEntry>
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{
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Success = true,
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Data = [],
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Total = 0,
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Message = "日志文件不存在"
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};
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}
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// 流式读取日志（边读边过滤，满足条件后停止）
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var (logEntries, total) = await ReadLogsStreamAsync(
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logFilePath,
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pageIndex,
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pageSize,
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searchKeyword,
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logLevel);
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var pagedData = logEntries;
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return new PagedResponse<LogEntry>
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{
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Success = true,
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Data = pagedData.ToArray(),
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Total = total,
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Message = "获取日志成功"
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};
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}
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catch (Exception ex)
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{
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logger.LogError(ex, "获取日志失败");
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return new PagedResponse<LogEntry>
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{
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Success = false,
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Data = [],
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Total = 0,
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Message = $"获取日志失败: {ex.Message}"
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};
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}
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}
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/// <summary>
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/// 获取可用的日志日期列表
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/// </summary>
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[HttpGet]
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public IActionResult GetAvailableDates()
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{
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try
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{
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var logDirectory = Path.Combine(Directory.GetCurrentDirectory(), "logs");
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if (!Directory.Exists(logDirectory))
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{
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return Ok(new { success = true, data = new List<string>() });
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}
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var logFiles = Directory.GetFiles(logDirectory, "log-*.txt");
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var dates = logFiles
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.Select(f => Path.GetFileNameWithoutExtension(f))
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.Select(name => name.Replace("log-", ""))
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.OrderByDescending(d => d)
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.ToList();
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return Ok(new { success = true, data = dates });
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}
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catch (Exception ex)
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{
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logger.LogError(ex, "获取日志日期列表失败");
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return Ok(new { success = false, message = $"获取日志日期列表失败: {ex.Message}" });
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}
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}
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/// <summary>
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/// 合并多行日志（已废弃，现在在流式读取中处理）
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/// </summary>
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[Obsolete("Use ReadLogsStreamAsync instead")]
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private List<string> MergeMultiLineLog(string[] lines)
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{
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var mergedLines = new List<string>();
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var currentLog = new System.Text.StringBuilder();
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// 日志行开始的正则表达式
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var logStartPattern = new System.Text.RegularExpressions.Regex(
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@"^\[\d{4}-\d{2}-\d{2} \d{2}:\d{2}:\d{2}\.\d{3} [+-]\d{2}:\d{2}\]"
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);
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foreach (var line in lines)
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{
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if (string.IsNullOrWhiteSpace(line))
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continue;
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// 检查是否是新的日志条目
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if (logStartPattern.IsMatch(line))
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{
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// 保存之前的日志
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if (currentLog.Length > 0)
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{
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mergedLines.Add(currentLog.ToString());
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currentLog.Clear();
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}
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currentLog.Append(line);
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}
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else
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{
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// 这是上一条日志的延续,添加换行符后追加
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if (currentLog.Length > 0)
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{
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currentLog.Append('\n').Append(line);
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}
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}
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}
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// 添加最后一条日志
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if (currentLog.Length > 0)
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{
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mergedLines.Add(currentLog.ToString());
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}
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return mergedLines;
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}
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/// <summary>
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/// 解析单行日志
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/// </summary>
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private LogEntry? ParseLogLine(string line)
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{
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try
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{
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// 日志格式示例: [2025-12-29 16:38:45.730 +08:00] [INF] Message here
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// 使用正则表达式解析
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var match = System.Text.RegularExpressions.Regex.Match(
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line,
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@"^\[(\d{4}-\d{2}-\d{2} \d{2}:\d{2}:\d{2}\.\d{3} [+-]\d{2}:\d{2})\] \[([A-Z]{3})\] (.*)$"
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);
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if (match.Success)
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{
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return new LogEntry
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{
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Timestamp = match.Groups[1].Value,
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Level = match.Groups[2].Value,
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Message = match.Groups[3].Value
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};
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}
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// 如果不匹配标准格式，将整行作为消息
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return new LogEntry
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{
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Timestamp = DateTime.Now.ToString("yyyy-MM-dd HH:mm:ss.fff zzz"),
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Level = "LOG",
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Message = line
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};
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}
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catch
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{
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return null;
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}
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}
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/// <summary>
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/// 流式读取日志（真正的流式：只读取需要的数据，满足后立即停止）
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/// </summary>
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private async Task<(List<LogEntry> entries, int total)> ReadLogsStreamAsync(
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string path,
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int pageIndex,
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int pageSize,
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string? searchKeyword,
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string? logLevel)
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{
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var filteredEntries = new List<LogEntry>();
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var currentLog = new System.Text.StringBuilder();
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var logStartPattern = new System.Text.RegularExpressions.Regex(
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@"^\[\d{4}-\d{2}-\d{2} \d{2}:\d{2}:\d{2}\.\d{3} [+-]\d{2}:\d{2}\]");
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// 计算需要读取的最大条目数（取最近的N条日志用于倒序分页）
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// 由于日志倒序显示，我们读取足够的数据以覆盖当前页
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var maxEntriesToRead = pageIndex * pageSize + pageSize; // 多读一页用于判断是否有下一页
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using var fileStream = new FileStream(
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path,
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FileMode.Open,
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FileAccess.Read,
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FileShare.ReadWrite);
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using var streamReader = new StreamReader(fileStream);
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string? line;
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var readCount = 0;
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while ((line = await streamReader.ReadLineAsync()) != null)
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{
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if (string.IsNullOrWhiteSpace(line))
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continue;
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// 检查是否是新的日志条目
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if (logStartPattern.IsMatch(line))
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{
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// 处理之前累积的日志
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if (currentLog.Length > 0)
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{
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var logEntry = ParseLogLine(currentLog.ToString());
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if (logEntry != null && PassFilter(logEntry, searchKeyword, logLevel))
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{
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filteredEntries.Add(logEntry);
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readCount++;
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// 如果已读取足够数据，提前退出
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if (readCount >= maxEntriesToRead)
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{
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break;
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}
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}
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currentLog.Clear();
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}
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currentLog.Append(line);
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}
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else
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{
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// 这是上一条日志的延续
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if (currentLog.Length > 0)
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{
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currentLog.Append('\n').Append(line);
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}
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}
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}
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// 处理最后一条日志（如果循环正常结束或刚好在日志边界退出）
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if (currentLog.Length > 0 && readCount < maxEntriesToRead)
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{
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var logEntry = ParseLogLine(currentLog.ToString());
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if (logEntry != null && PassFilter(logEntry, searchKeyword, logLevel))
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{
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filteredEntries.Add(logEntry);
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}
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}
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// 倒序排列（最新的在前面）
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filteredEntries.Reverse();
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// 计算分页
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var skip = (pageIndex - 1) * pageSize;
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var pagedData = filteredEntries.Skip(skip).Take(pageSize).ToList();
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// total 返回 -1 表示未知（避免扫描整个文件）
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// 前端可以根据返回数据量判断是否有下一页
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return (pagedData, -1);
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}
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/// <summary>
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/// 检查日志条目是否通过过滤条件
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/// </summary>
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private bool PassFilter(LogEntry logEntry, string? searchKeyword, string? logLevel)
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{
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if (!string.IsNullOrEmpty(searchKeyword) &&
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!logEntry.Message.Contains(searchKeyword, StringComparison.OrdinalIgnoreCase))
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{
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return false;
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}
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if (!string.IsNullOrEmpty(logLevel) &&
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!logEntry.Level.Equals(logLevel, StringComparison.OrdinalIgnoreCase))
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{
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return false;
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}
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return true;
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}
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/// <summary>
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/// 读取文件所有行（支持共享读取）
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/// </summary>
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private async Task<string[]> ReadAllLinesAsync(string path)
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{
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var lines = new List<string>();
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using (var fileStream = new FileStream(
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path,
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FileMode.Open,
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FileAccess.Read,
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FileShare.ReadWrite))
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using (var streamReader = new StreamReader(fileStream))
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{
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string? line;
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while ((line = await streamReader.ReadLineAsync()) != null)
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{
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lines.Add(line);
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}
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}
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return lines.ToArray();
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}
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}
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/// <summary>
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/// 日志条目
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/// </summary>
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public class LogEntry
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{
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/// <summary>
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/// 时间戳
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/// </summary>
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public string Timestamp { get; set; } = string.Empty;
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/// <summary>
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/// 日志级别
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/// </summary>
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public string Level { get; set; } = string.Empty;
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/// <summary>
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/// 日志消息
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/// </summary>
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public string Message { get; set; } = string.Empty;
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} |