Initial commit

logger.ts

@@ -0,0 +1,45 @@
+import {appendFileSync} from 'fs';
+import moment from 'moment-timezone';
+
+import {config} from './config';
+
+enum LogLevel{
+  ERROR = 'ERROR',
+  WARNING = 'WARNING',
+  DEBUG = 'DEBUG',
+  LOG = 'LOG',
+  INFO = 'INFO',
+}
+
+class Logger{
+  constructor(readonly logFile?: string){
+    this.debug('logger initialized');
+  }
+  private currentTime(): string{
+    return '[' + moment().tz('Asia/Taipei').format('YYYY/MM/DD hh:mm:ss') + ']';
+  }
+  private writeLog(content: string, logLevel: LogLevel): void{
+    const line = `${this.currentTime()} ${logLevel}: ${content}`;
+    console.log(line);
+    if(this.logFile !== undefined){
+      appendFileSync(this.logFile, line + '\n');
+    }
+  }
+  error(content: string): Error{
+    this.writeLog(content, LogLevel.ERROR); return Error(content);
+  }
+  warning(content: string): string{
+    this.writeLog(content, LogLevel.WARNING); return content;
+  }
+  debug(content: string): string{
+    this.writeLog(content, LogLevel.DEBUG); return content;
+  }
+  log(content: string): string{
+    this.writeLog(content, LogLevel.LOG); return content;
+  }
+  info(content: string): string{
+    this.writeLog(content, LogLevel.INFO); return content;
+  }
+}
+
+export const logger = new Logger(`./${config.logger.logFile}`);