level-condition

Get notified when a condition is triggered inside a LevelDB

npm install level-condition
12 downloads in the last month

level-condition

Get notified when a condition is triggered inside a LevelDB.

build status

Example

Get notified when key a has value "foo" and key b has value "bar".

var Condition = require('level-condition');
var level = require('level');
var db = level(__dirname + '/db');

Condition(db)
  .keys('a', 'b')
  .check(function(a, b) {
    return a == 'foo' && b == 'bar';
  })
  .success(function(a, b) {
    console.log('a: %s, b: %s', a, b);
  });

db.put('a', 'foo')
db.del('a');
db.put('b', 'bar');
db.put('a', 'foo'); // success

API

Condition(db)

Create a new condition instance that watches db.

Condition#keys(...)

Start watching given keys.

Condition#check(fn)

Register a check function that gets called with all values and is expected to return a boolean value.

If you don't provide one, a function that checks for all values' truthyness.

Condition#success(fn)

Register a success function that gets called with all values when the check was successful.

If you don't pass callback, a thunk/continuable is returned.

Installation

With npm do:

npm install level-condition

License

(MIT)

Copyright (c) 2013 Julian Gruber <julian@juliangruber.com>

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

npm loves you