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| 1 | +export enum LogLevel { |
| 2 | + LOG = 0, |
| 3 | + DEBUG = 1, |
| 4 | + INFO = 2, |
| 5 | + WARN = 3, |
| 6 | + ERROR = 4, |
| 7 | +} |
| 8 | + |
| 9 | +export interface LogContext { |
| 10 | + level: LogLevel; |
| 11 | + args: any[]; |
| 12 | + timestamp: Date; |
| 13 | + metadata?: Record<string, any>; |
| 14 | +} |
| 15 | + |
| 16 | +/** |
| 17 | + * Plugin interface for extending logger behavior |
| 18 | + */ |
| 19 | +export interface LoggerPlugin { |
| 20 | + /** |
| 21 | + * Hook called before logging. Can modify the log context or abort logging. |
| 22 | + * @param context - The current log context |
| 23 | + * @returns Modified context to continue logging, or null to abort |
| 24 | + */ |
| 25 | + beforeLog?(context: LogContext): LogContext | null; |
| 26 | + |
| 27 | + /** |
| 28 | + * Hook called after logging is completed |
| 29 | + * @param context - The log context that was used |
| 30 | + */ |
| 31 | + afterLog?(context: LogContext): void; |
| 32 | + |
| 33 | + /** |
| 34 | + * Hook called when an error occurs during the logging process |
| 35 | + * @param error - The error that occurred |
| 36 | + * @param context - The log context when the error happened |
| 37 | + */ |
| 38 | + onError?(error: Error, context: LogContext): void; |
| 39 | +} |
| 40 | + |
| 41 | +/** |
| 42 | + * BAI Logger class for structured logging with plugin support |
| 43 | + */ |
| 44 | +class Logger { |
| 45 | + private plugins: LoggerPlugin[] = []; |
| 46 | + private metadata: Record<string, any> = {}; |
| 47 | + private enabled: boolean = process.env.NODE_ENV !== 'production'; |
| 48 | + private static instance: Logger; |
| 49 | + |
| 50 | + private constructor() { |
| 51 | + // Singleton pattern: private constructor |
| 52 | + } |
| 53 | + |
| 54 | + use(plugin: LoggerPlugin): this { |
| 55 | + this.plugins.push(plugin); |
| 56 | + return this; |
| 57 | + } |
| 58 | + |
| 59 | + setMetadata(key: string, value: any): this { |
| 60 | + this.metadata[key] = value; |
| 61 | + return this; |
| 62 | + } |
| 63 | + |
| 64 | + clearMetadata(): this { |
| 65 | + this.metadata = {}; |
| 66 | + return this; |
| 67 | + } |
| 68 | + |
| 69 | + setEnabled(enabled: boolean): this { |
| 70 | + this.enabled = enabled; |
| 71 | + return this; |
| 72 | + } |
| 73 | + |
| 74 | + private logging(level: LogLevel, ...args: any[]) { |
| 75 | + if (!this.enabled) return; |
| 76 | + |
| 77 | + let context: LogContext = { |
| 78 | + level, |
| 79 | + args, |
| 80 | + timestamp: new Date(), |
| 81 | + metadata: { ...this.metadata }, |
| 82 | + }; |
| 83 | + |
| 84 | + try { |
| 85 | + // Before hooks |
| 86 | + for (const plugin of this.plugins) { |
| 87 | + const result = plugin.beforeLog?.(context); |
| 88 | + if (result === null) return; |
| 89 | + if (result !== undefined) { |
| 90 | + context = result; |
| 91 | + } |
| 92 | + } |
| 93 | + |
| 94 | + // Actual log output |
| 95 | + const consoleMethods = [ |
| 96 | + // eslint-disable-next-line no-console |
| 97 | + console.log, |
| 98 | + // eslint-disable-next-line no-console |
| 99 | + console.debug, |
| 100 | + // eslint-disable-next-line no-console |
| 101 | + console.info, |
| 102 | + // eslint-disable-next-line no-console |
| 103 | + console.warn, |
| 104 | + // eslint-disable-next-line no-console |
| 105 | + console.error, |
| 106 | + ]; |
| 107 | + consoleMethods[level](...context.args); |
| 108 | + |
| 109 | + // After hooks |
| 110 | + for (const plugin of this.plugins) { |
| 111 | + plugin.afterLog?.(context); |
| 112 | + } |
| 113 | + } catch (error) { |
| 114 | + // Plugin error handling |
| 115 | + for (const plugin of this.plugins) { |
| 116 | + plugin.onError?.(error as Error, context); |
| 117 | + } |
| 118 | + } |
| 119 | + } |
| 120 | + |
| 121 | + log(...args: any[]) { |
| 122 | + this.logging(LogLevel.LOG, ...args); |
| 123 | + } |
| 124 | + |
| 125 | + debug(...args: any[]) { |
| 126 | + this.logging(LogLevel.DEBUG, ...args); |
| 127 | + } |
| 128 | + |
| 129 | + info(...args: any[]) { |
| 130 | + this.logging(LogLevel.INFO, ...args); |
| 131 | + } |
| 132 | + |
| 133 | + warn(...args: any[]) { |
| 134 | + this.logging(LogLevel.WARN, ...args); |
| 135 | + } |
| 136 | + |
| 137 | + error(...args: any[]) { |
| 138 | + this.logging(LogLevel.ERROR, ...args); |
| 139 | + } |
| 140 | + |
| 141 | + // Helper for method chaining |
| 142 | + withContext(key: string, value: any) { |
| 143 | + return new ContextualLogger(this, { [key]: value }); |
| 144 | + } |
| 145 | + |
| 146 | + static getInstance(): Logger { |
| 147 | + if (!Logger.instance) { |
| 148 | + Logger.instance = new Logger(); |
| 149 | + } |
| 150 | + return Logger.instance; |
| 151 | + } |
| 152 | +} |
| 153 | + |
| 154 | +// Logger with context support |
| 155 | +export class ContextualLogger { |
| 156 | + constructor( |
| 157 | + private baseLogger: Logger, |
| 158 | + private context: Record<string, any>, |
| 159 | + ) {} |
| 160 | + |
| 161 | + private withContext(fn: () => void) { |
| 162 | + this.baseLogger.setMetadata('context', this.context); |
| 163 | + try { |
| 164 | + fn(); |
| 165 | + } finally { |
| 166 | + this.baseLogger.clearMetadata(); |
| 167 | + } |
| 168 | + } |
| 169 | + |
| 170 | + log(...args: any[]) { |
| 171 | + this.withContext(() => this.baseLogger.log(...args)); |
| 172 | + } |
| 173 | + |
| 174 | + debug(...args: any[]) { |
| 175 | + this.withContext(() => this.baseLogger.debug(...args)); |
| 176 | + } |
| 177 | + |
| 178 | + info(...args: any[]) { |
| 179 | + this.withContext(() => this.baseLogger.info(...args)); |
| 180 | + } |
| 181 | + |
| 182 | + warn(...args: any[]) { |
| 183 | + this.withContext(() => this.baseLogger.warn(...args)); |
| 184 | + } |
| 185 | + |
| 186 | + error(...args: any[]) { |
| 187 | + this.withContext(() => this.baseLogger.error(...args)); |
| 188 | + } |
| 189 | +} |
| 190 | + |
| 191 | +// Export Logger instance type (not the class itself) |
| 192 | +export type BAILogger = Logger; |
| 193 | + |
| 194 | +const useBAILogger = () => { |
| 195 | + return { logger: Logger.getInstance() }; |
| 196 | +}; |
| 197 | + |
| 198 | +export default useBAILogger; |
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