46

GitHub - Axosoft/nsfw: A super fast and scaleable file watcher that provides a c...

 4 years ago
source link: https://github.com/Axosoft/nsfw
Go to the source link to view the article. You can view the picture content, updated content and better typesetting reading experience. If the link is broken, please click the button below to view the snapshot at that time.

README.md

node-sentinel-file-watcher

Linux OS X Windows 68747470733a2f2f7472617669732d63692e6f72672f41786f736f66742f6e7366772e7376673f6272616e63683d6d6173746572 68747470733a2f2f63692e6170707665796f722e636f6d2f6170692f70726f6a656374732f7374617475732f3739656a6c71376536306b6a6d626c363f7376673d74727565 A simple file watcher library for node.

Why NSFW?

NSFW is a native abstraction for Linux, Windows, and OSX file watching services which tries to keep a consistent interface and feature set across operating systems. NSFW offers recursive file watching into deep file systems all at no additional cost to the Javascript layer. In Linux, NSFW recursively builds an inotify watch tree natively, which collects events concurrently to the javascript thread. In OSX, NSFW utilizes the FSEventsService, which recursively watches for file system changes in a specified directory. In Windows, NSFW implements a server around the ReadDirectoryChangesW method.

When NSFW has events and is not being throttled, it will group those events in the order that they occurred and report them to the Javascript layer in a single callback. This is an improvement over services that utilize Node FS.watch, which uses a callback for every file event that is triggered. Every callback FS.watch makes to the event queue is a big bonus to NSFW's performance when watching large file system operations, because NSFW will only make 1 callback with many events within a specified throttle period.

So why NSFW? Because it has a consistent and minimal footprint in the Javascript layer, manages recursive watching for you, and is super easy to use.

Usage

var nsfw = require('nsfw');

var watcher1;
return nsfw(
  'dir1',
  function(events) {
    // handle events
  })
  .then(function(watcher) {
    watcher1 = watcher;
    return watcher.start();
  })
  .then(function() {
    // we are now watching dir1 for events!

    // To stop watching
    watcher1.stop()
  });

// With options
var watcher2;
return nsfw(
  'dir2',
  function(events) {
  // handles other events
  },
  {
    debounceMS: 250,
    errorCallback(errors) {
      //handle errors
    }
  })
  .then(function(watcher) {
    watcher2 = watcher;
    return watcher.start();
  })
  .then(function() {
    // we are now watching dir2 for events!
  })
  .then(function() {
    // To stop watching
    watcher2.stop();
  })

Callback Argument

An array of events as they have happened in a directory, it's children, or to a file.

[
  {
    "action": 2, // nsfw.actions.MODIFIED
    "directory": "/home/nsfw/watchDir",
    "file": "file1.ext"
  },
  {
    "action": 0, // nsfw.actions.CREATED
    "directory": "/home/nsfw/watchDir",
    "file": "folder"
  },
  {
    "action": 1, // nsfw.actions.DELETED
    "directory": "home/nsfw/watchDir/testFolder",
    "file": "test.ext"
  },
  {
    "action": 3, // nsfw.actions.RENAMED
    "directory": "home/nsfw/watchDir",
    "oldFile": "oldname.ext",
    "newFile": "newname.ext"
  }
]

Event are enumerated by the nsfw.actions enumeration

nsfw.actions = {
  CREATED: 0,
  DELETED: 1,
  MODIFIED: 2,
  RENAMED: 3
};

Installation

NSFW is a native node module and requires Node-Gyp to be functional before you can install it. Make sure you have completed installing all of the dependencies listed for Node-Gyp on your operating system.


About Joyk


Aggregate valuable and interesting links.
Joyk means Joy of geeK