Watch file changes and delivery the file content like tail
The WatcherService is the front to monitor file changes.
/* */ import { IWatcherLiner, splitLines, WatcherService, WatcherObservable } from 'endless-core';
/* */
/* */ const watcherService: WatcherService = ...
/* */ const filename = ...
/* (1) */ const watcher$: WatcherObservable = watcherService.add(filename, { encoding: 'utf8', fromPosition: 1024});
/* */
/* (2) */ watcher$.start()
/* */ .pipe(
/* */ splitLines(),
/* */ )
/* */ .subscribe((line: IWatcherLiner) => {
/* */ console.log('%s: %s', line.index, line.text);
/* */ });
/* */
/* */
/* (3) */ watcher$.close();- (1) With "add" a WatcherObservable is created, which reads the file as UTF-8 and starts at the position 1024 bytes from the end.
The watcherWorker manages the file and notify the changes to the observable - (2) Start watching and split the output into line.
- (3) Close observer and stop watching
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