Keyer

One client and API for all key-value databases. Why? Useful while you make e.g. cache library and you want support for multiple databases.

Installation

npm i keyer --save

Example

const Keyer = require('keyer');

(async () => {

  const keyer = new Keyer({
    dialect: 'redis',
  });

  await keyer.connect();

  // Basic IO
  await keyer.set('hello', 'world');
  console.log(await keyer.get('hello')); // world
  console.log(await keyer.exists('hello')); // true
  await keyer.del('hello');
  console.log(await keyer.exists('hello')); // false

  // Support for lists
  await keyer.listAppend('mylist', 'item');
  console.log(await keyer.listGetRange('mylist', 0, -1)); // ['item']

})();

Constructor

new Keyer({
  dialect: 'redis', // kv database

  host: '127.0.0.1',
  port: 6379,
  // or
  server: '127.0.0.1:6379', // for e.g. Memcached

  // Keyer supports more options depends on database.
  // Redis: https://www.npmjs.com/package/redis#options-object-properties
  // Memcached: https://www.npmjs.com/package/memcached#options
});

Methods

Basic

checkSupport()

Returns object with all possible methods (as key) and true or false.

{
  validateConfig: true,
  connect: true,
  disconnect: true,
  get: true,
  set: true,
  del: true,
  flush: true,
  exists: true,
  listAppend: true,
  listPrepend: true,
  listPop: true,
  listShift: true,
  listLength: true,
  listSetIndex: true,
  listGetIndex: true,
  listGetRange: true,
  listGetFull: true,
}

connect()

disconnect()

get(key)

Returns value for given key.

set(key, value, options)

await keyer.set('foo', 'bar', {
  expire: 60, // expire time in seconds
  onlyIfExists: true, // only modify already existing key
  ignoreIfExists: true, // don't set key if already exists
});

del(key)

Removes the specified key.

flush()

Flush database.

exists(key)

Returns true if key exists or false if not exists.

Lists

listAppend(key, value, onlyIfExists)

Adds value to the end of list.

listPrepend(key, value, onlyIfExists)

Adds value to the beginning of list.

listPop(key)

Removes the last value of list and returns removed value.

listShift(key)

Removes the first value of list and returns removed value.

listLength(key)

Returns length of list.

listSetIndex(key, index, value)

Sets value on the specified index of list.

listGetIndex(key, index)

Returns value of the specified index of list.

listGetRange(key, start, end)

Returns value in specified indexes range of list.

listGetFull(key)

Returns full list.

Methods support

.	Redis	Memcached
connect	✓	✓
disconnect	✓	✓
get	✓	✓
set	✓	✓
del	✓	✓
flush	✓	✓
exists	✓	✓
listAppend	✓	✗
listPrepend	✓	✗
listPop	✓	✗
listShift	✓	✗
listLength	✓	✗
listSetIndex	✓	✗
listGetIndex	✓	✗
listGetRange	✓	✗
listGetFull	✓	✗

Events

connected

disconnected

error

warning

Contributing

If you are missing support for any database, please contribute Keyer. Below you have dialect examples.

• Redis dialect: /dialects/redis/index.js
• Memcached dialect: /dialects/memcached/index.js

License

MIT License

Copyright (c) 2019 Szymon Lisowiec

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.