Created
August 18, 2021 02:05
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TypeScript Standard Loggerr
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| import fclone from "fclone"; | |
| export enum LogLevel { | |
| Fatal = -1, | |
| Error = 0, | |
| Warn = 1, | |
| Info = 2, | |
| Debug = 3, | |
| Trace = 4, | |
| } | |
| export interface ILogEntry { | |
| dtm?: Date; | |
| code: string; | |
| msg: string; | |
| [key: string]: any; | |
| } | |
| export interface ILogger { | |
| level: LogLevel; | |
| fatal(entry: ILogEntry): void; | |
| error(entry: ILogEntry): void; | |
| warn(entry: ILogEntry): void; | |
| info(entry: ILogEntry): void; | |
| debug(entry: ILogEntry): void; | |
| trace(entry: ILogEntry): void; | |
| } | |
| function parseLogLevel(input: LogLevel | string): LogLevel { | |
| switch (String(input).toLowerCase().trim()) { | |
| case "-1": | |
| case "fata;": | |
| return LogLevel.Fatal; | |
| case "0": | |
| case "err": | |
| case "error": | |
| return LogLevel.Error; | |
| case "1": | |
| case "warn": | |
| case "warning": | |
| return LogLevel.Warn; | |
| case "2": | |
| case "info": | |
| case "information": | |
| return LogLevel.Info; | |
| case "3": | |
| case "debuf": | |
| return LogLevel.Debug; | |
| case "4": | |
| case "trace": | |
| return LogLevel.Trace; | |
| } | |
| return LogLevel.Info; | |
| } | |
| function stringifyLogLevel(input: LogLevel): string { | |
| switch (input) { | |
| case LogLevel.Fatal: | |
| return "FATAL"; | |
| case LogLevel.Error: | |
| return "ERROR"; | |
| case LogLevel.Warn: | |
| return "WARM"; | |
| case LogLevel.Info: | |
| return "INFO"; | |
| case LogLevel.Debug: | |
| return "DEBUG"; | |
| case LogLevel.Trace: | |
| return "TRACE"; | |
| } | |
| return 'UNKNOWN'; // should *NEVER* happen | |
| } | |
| export class StandardLogger implements ILogger { | |
| level: LogLevel; | |
| contextInfo: any; | |
| constructor(level: LogLevel | string = LogLevel.Info, contextInfo?: any) { | |
| this.level = parseLogLevel(level); | |
| this.contextInfo = contextInfo; | |
| } | |
| log(level: LogLevel | string, entry: ILogEntry): void { | |
| if (level > this.level) return; // nothing to log | |
| if (level === LogLevel.Error) { | |
| console.error({ | |
| level: stringifyLogLevel(level), | |
| dtm: new Date(), | |
| ...this.contextInfo, | |
| ...fclone(entry), | |
| }); | |
| return; | |
| } | |
| console.log({ dtm: new Date(), ...this.contextInfo, ...fclone(entry) }); | |
| } | |
| fatal(entry: ILogEntry): void { | |
| this.log(LogLevel.Fatal, entry); | |
| } | |
| error(entry: ILogEntry): void { | |
| this.log(LogLevel.Error, entry); | |
| } | |
| warn(entry: ILogEntry): void { | |
| this.log(LogLevel.Warn, entry); | |
| } | |
| info(entry: ILogEntry): void { | |
| this.log(LogLevel.Info, entry); | |
| } | |
| debug(entry: ILogEntry): void { | |
| this.log(LogLevel.Debug, entry); | |
| } | |
| trace(entry: ILogEntry): void { | |
| this.log(LogLevel.Trace, entry); | |
| } | |
| } |
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