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| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 | import fs from 'fs'; import path from 'path'; // 日志级别枚举 export enum LogLevel { DEBUG = 'DEBUG', INFO = 'INFO', WARN = 'WARN', ERROR = 'ERROR', } // 请求日志结构 export interface RequestLog { requestId: string; timestamp: Date; method: string; path: string; query: string; status: number; responseTime: number; responseSize: number; level: LogLevel; error?: string; stack?: string; headers: Record<string, string>; ip: string; userAgent: string; body?: any; } // 错误分析结果 export interface ErrorAnalysis { errorType: string; errorMessage: string; count: number; lastOccurrence: Date; paths: string[]; solutions: string[]; } // 日志服务类 export class LogService { private logs: RequestLog[] = []; private maxLogs: number = 10000; private logFilePath: string; private errorPatterns: Map<string, RegExp> = new Map(); private errorSolutions: Map<string, string[]> = new Map(); constructor() { this.logFilePath = path.join(process.cwd(), 'logs', 'requests.json'); // 确保日志目录存在 const logDir = path.dirname(this.logFilePath); if (!fs.existsSync(logDir)) { fs.mkdirSync(logDir, { recursive: true }); } // 初始化错误模式和解决方案 this.initializeErrorPatterns(); // 从文件加载历史日志 this.loadLogs(); } // 初始化常见错误模式 private initializeErrorPatterns(): void { // 数据库连接错误 this.errorPatterns.set('DB_CONNECTION', /ECONNREFUSED|ER_ACCESS_DENIED_ERROR|Connection refused/); this.errorSolutions.set('DB_CONNECTION', [ '检查MySQL服务是否启动', '检查数据库连接配置是否正确', '确认数据库用户权限' ]); // JSON解析错误 this.errorPatterns.set('JSON_PARSE', /JSON\.parse|SyntaxError|Unexpected token/); this.errorSolutions.set('JSON_PARSE', [ '检查请求body格式是否为有效JSON', '确认Content-Type为application/json' ]); // 参数验证错误 this.errorPatterns.set('VALIDATION', /validation|is required|invalid parameter/); this.errorSolutions.set('VALIDATION', [ '检查请求参数是否完整', '验证参数类型是否正确' ]); // 文件不存在错误 this.errorPatterns.set('FILE_NOT_FOUND', /ENOENT|no such file|not found/); this.errorSolutions.set('FILE_NOT_FOUND', [ '检查文件路径是否正确', '确认文件是否已上传' ]); // 权限错误 this.errorPatterns.set('PERMISSION', /EACCES|permission denied|Unauthorized/); this.errorSolutions.set('PERMISSION', [ '检查用户权限设置', '确认登录状态是否有效' ]); // 超时错误 this.errorPatterns.set('TIMEOUT', /ETIMEDOUT|timeout|TIMEOUT/); this.errorSolutions.set('TIMEOUT', [ '检查网络连接是否稳定', '增加请求超时时间', '重试请求' ]); } // 加载历史日志 private loadLogs(): void { try { if (fs.existsSync(this.logFilePath)) { const data = fs.readFileSync(this.logFilePath, 'utf-8'); const logs = JSON.parse(data); this.logs = logs.map((log: any) => ({ ...log, timestamp: new Date(log.timestamp) })); console.log(`📋 已加载 ${this.logs.length} 条历史日志`); } } catch (error) { console.error('加载日志文件失败:', error); } } // 保存日志到文件 private saveLogs(): void { try { // 只保存最近的日志 const logsToSave = this.logs.slice(-this.maxLogs); fs.writeFileSync(this.logFilePath, JSON.stringify(logsToSave, null, 2)); } catch (error) { console.error('保存日志文件失败:', error); } } // 记录请求日志 logRequest(log: RequestLog): void { log.timestamp = new Date(); // 添加到内存日志 this.logs.push(log); // 超过最大数量时移除旧日志 if (this.logs.length > this.maxLogs) { this.logs = this.logs.slice(-this.maxLogs); } // 异步保存到文件 setTimeout(() => this.saveLogs(), 100); // 控制台输出 const levelEmoji = { [LogLevel.DEBUG]: '🔍', [LogLevel.INFO]: '📝', [LogLevel.WARN]: '⚠️', [LogLevel.ERROR]: '❌' }; console.log( `${levelEmoji[log.level]} [${log.level}] ${log.method} ${log.path} - ${log.status} (${log.responseTime}ms)` ); // 错误日志额外输出错误信息 if (log.error) { console.error(` Error: ${log.error}`); } } // 获取所有日志 getLogs(filter?: { level?: LogLevel; path?: string; status?: number; startTime?: Date; endTime?: Date; }): RequestLog[] { let result = [...this.logs]; if (filter) { if (filter.level) { result = result.filter(log => log.level === filter.level); } if (filter.path) { result = result.filter(log => log.path.includes(filter.path)); } if (filter.status) { result = result.filter(log => log.status === filter.status); } if (filter.startTime) { result = result.filter(log => log.timestamp >= filter.startTime); } if (filter.endTime) { result = result.filter(log => log.timestamp <= filter.endTime); } } return result; } // 获取错误日志 getErrorLogs(): RequestLog[] { return this.logs.filter(log => log.level === LogLevel.ERROR); } // 获取最近N条错误日志 getRecentErrors(count: number = 10): RequestLog[] { return this.logs .filter(log => log.level === LogLevel.ERROR) .slice(-count) .reverse(); } // 分析错误模式 analyzeErrors(): ErrorAnalysis[] { const errorLogs = this.getErrorLogs(); const analyses: Map<string, ErrorLogGroup> = new Map(); interface ErrorLogGroup { errorType: string; errorMessage: string; count: number; lastOccurrence: Date; paths: Set<string>; } for (const log of errorLogs) { if (!log.error) continue; // 匹配错误类型 let matchedType = 'UNKNOWN'; let matchedMessage = log.error; for (const [type, pattern] of this.errorPatterns) { if (pattern.test(log.error)) { matchedType = type; break; } } const key = `${matchedType}:${log.error.substring(0, 100)}`; if (!analyses.has(key)) { analyses.set(key, { errorType: matchedType, errorMessage: log.error, count: 0, lastOccurrence: log.timestamp, paths: new Set() }); } const group = analyses.get(key)!; group.count++; group.lastOccurrence = log.timestamp; group.paths.add(log.path); } // 转换为结果数组 return Array.from(analyses.values()).map(group => ({ errorType: group.errorType, errorMessage: group.errorMessage, count: group.count, lastOccurrence: group.lastOccurrence, paths: Array.from(group.paths), solutions: this.errorSolutions.get(group.errorType) || ['请查看错误日志获取更多信息'] })); } // 自动分析并提供修复建议 autoAnalyzeError(errorLog: RequestLog): string[] { if (!errorLog.error) return ['没有错误信息']; const suggestions: string[] = []; // 检查是否匹配已知错误模式 for (const [type, pattern] of this.errorPatterns) { if (pattern.test(errorLog.error)) { const solutions = this.errorSolutions.get(type); if (solutions) { suggestions.push(...solutions); } } } // 如果没有匹配的模式，提供通用建议 if (suggestions.length === 0) { suggestions.push('检查错误日志了解详细信息'); suggestions.push('查看相关代码逻辑'); suggestions.push('尝试重新请求'); } return suggestions; } // 清除旧日志 clearLogs(olderThanHours?: number): number { const now = new Date(); let initialCount = this.logs.length; if (olderThanHours) { const cutoffTime = new Date(now.getTime() - olderThanHours * 60 * 60 * 1000); this.logs = this.logs.filter(log => log.timestamp >= cutoffTime); } else { this.logs = []; } const removed = initialCount - this.logs.length; this.saveLogs(); return removed; } // 获取统计数据 getStats(): { total: number; errors: number; warnings: number; averageResponseTime: number; topPaths: Array<{ path: string; count: number }>; } { const stats = { total: this.logs.length, errors: this.logs.filter(l => l.level === LogLevel.ERROR).length, warnings: this.logs.filter(l => l.level === LogLevel.WARN).length, averageResponseTime: 0, topPaths: [] as Array<{ path: string; count: number }> }; if (this.logs.length > 0) { const totalResponseTime = this.logs.reduce((sum, log) => sum + log.responseTime, 0); stats.averageResponseTime = Math.round(totalResponseTime / this.logs.length); } // 统计最常访问的路径 const pathCounts = new Map<string, number>(); for (const log of this.logs) { pathCounts.set(log.path, (pathCounts.get(log.path) || 0) + 1); } stats.topPaths = Array.from(pathCounts.entries()) .map(([path, count]) => ({ path, count })) .sort((a, b) => b.count - a.count) .slice(0, 10); return stats; } } // 导出单例 export const logService = new LogService(); |