How to update default config in production environment at run time

Related issue #7 answers how to change the logging config at compile-time (using environment), but I wish to know how to change the global config at run-time.

The logger.updateConfig(config) method only changes them for the current instance.

I am trying to perform this update in an APP_INITIALIZER of the Angular bootstrap, but it grabs a new copy of the config provided in forRoot(config). I wondering if the service could have another way to update the default config which is always provided to the service when initialized:

    // each instance of the logger should have their own config engine
    this.configService = new NgxLoggerConfigEngine(loggerConfig);

[bmtheo]

@dbfannin this would also be useful in our app

The user story is a bit different : We need to change the logLevel at runtime (by default in PROD mode it’s set to ERROR) but if we need to investigate on an issue, we’d like to modify that logLevel to DEBUG or TRACE for example.

So the updateConfig should update all “living” instances of NGXLogger AND the future instances.

Are you open to PR for this ? and if so I was thinking of doing something like this :

export class NGXLogger implements OnDestroy {
  private static readonly _sharedConfig: Subject<LoggerConfig> = new Subject<LoggerConfig>();
  /** Returns an observable when the sharedConfig is changed */
  public sharedConfigChanged(): Observable<LoggerConfig> {
    return NGXLogger._sharedConfig.asObservable();
  }

  /** Updates the config for all the instances of NGXLogger */
  public updateSharedConfig(config: LoggerConfig) {
    NGXLogger._sharedConfig.next(config);
  }

...

  // each instance of the logger should have their own config engine
  this.config = new NGXLoggerConfigEngine(loggerConfig, this.sharedConfigChanged());

[bradoyler]

So one workaround might be to read the logLevel from localStorage and then you can update the value in the browser console at runtime. This is how the nodejs debug module works.

example app.module.ts

....
const localLogLevel = localStorage.getItem('logLevel');
const defaultLogLevel = NgxLoggerLevel.INFO;
const logLevel = localLogLevel ? NgxLoggerLevel[localLogLevel] || defaultLogLevel : defaultLogLevel;
....
imports: [
  LoggerModule.forRoot({ level: logLevel })
]