libmemcached

Node.js bindings to the libMemcached library.

Table of contents

• Requirements
• Installation
• Usage
• API
  • constructor(config: string)
  • set(key: string, value: Buffer|string|number, expiration?:integer=0): this
  • add(key: string, value: Buffer|string|number, expiration?:integer=0): this
  • replace(key: string, value: Buffer|string|number, expiration?:integer=0): this
  • append(key: string, value: Buffer|string|number, expiration?:integer=0): this
  • prepend(key: string, value: Buffer|string|number, expiration?:integer=0): this
  • get(key: string): Buffer|undefined
  • exist(key: string): boolean
  • touch(key: string, expiration: integer): this
  • delete(key: string): this
  • increment(key: string, offset?: integer=1): integer
  • decrement(key: string, offset?: integer=1): integer

Requirements

• memcached >= 1.4.14
• libmemcached >= 1.0.18
• libmemcached-dev
• gcc with c++11

Installation

npm install libmemcached --save

or

yarn add libmemcached

Usage

const MemcachedClient = require('libmemcached')

API

constructor(config: string)

Initialize client.

config parameter is a libMemcached configuration string.

const mcc = new MemcachedClient('--SERVER=127.0.0.1')

set(key: string, value: Buffer|string|number, expiration?:integer=0): this

Store item.

mcc.set('key', 'val')

Function throws Error when:

• key is not provided
• when value is not provided

Function throws TypeError when:

• when value is boolean, null, undefined, function, object or array

try {
  mcc.set('key', true)
}
catch(err) {
  console.error(err)
}

add(key: string, value: Buffer|string|number, expiration?:integer=0): this

Add item. If key does exist - do nothing.

mcc.add('key', 'val')

Function throws Error when:

• key is not provided
• when value is not provided

Function throws TypeError when:

• when value is boolean, null, undefined, function, object or array

try {
  mcc.add('key', true)
}
catch(err) {
  console.error(err)
}

replace(key: string, value: Buffer|string|number, expiration?:integer=0): this

Replace item. If key doesn't exist - do nothing.

mcc.replace('key', 'val')

Function throws Error when:

• key is not provided
• when value is not provided

Function throws TypeError when:

• when value is boolean, null, undefined, function, object or array

try {
  mcc.replace('key', true)
}
catch(err) {
  console.error(err)
}

append(key: string, value: Buffer|string|number, expiration?:integer=0): this

Append value to existing item. If key doesn't exist - do nothing.

mcc.append('key', 'val')

Function throws Error when:

• key is not provided
• when value is not provided

Function throws TypeError when:

• when value is boolean, null, undefined, function, object or array

try {
  mcc.append('key', true)
}
catch(err) {
  console.error(err)
}

prepend(key: string, value: Buffer|string|number, expiration?:integer=0): this

Prepend value to existing item. If key doesn't exist - do nothing.

mcc.prepend('key', 'val')

Function throws Error when:

• key is not provided
• when value is not provided

Function throws TypeError when:

• when value is boolean, null, undefined, function, object or array

try {
  mcc.prepend('key', true)
}
catch(err) {
  console.error(err)
}

get(key: string): Buffer|undefined

Get item.

let val = mcc.get('key')

Function throws Error when:

• key is not provided

try {
  let key
  let val = mcc.get(key)
}
catch(err) {
  console.error(err)
}

Function returns undefined when key doesn't exist.

exist(key: string): boolean

Determine if a item exists.

if (mcc.exist('key')) {
  console.log('key exist')
} else {
  console.log('key doesn\'t exist')
}

Function throws Error when:

• key is not provided

try {
  let key
  mcc.exist(key)
}
catch(err) {
  console.error(err)
}

touch(key: string, expiration: integer): this

Update the expiration time of an existing item without fetching it.

mcc.touch('key', 100)

Function throws Error when:

• key is not provided

Function throws TypeError when:

• expiration isn't integer

try {
  mcc.touch('key', 1.23)
}
catch(err) {
  console.error(err)
}

delete(key: string): this

Remove a item.

mcc.delete('key')

Function throws Error when:

• key is not provided
• key is not exist

try {
  mcc.delete('not_existent_key')
}
catch(err) {
  console.error(err)
}

increment(key: string, offset?: integer=1): integer

Incrementing item.

let key = mcc.increment('key', 10)

Function throws Error when:

• key is not provided
• key is not exist

Function throws TypeError when:

• item is not integer
• offset is not integer

try {
  let key = mcc.increment('key', 10.1)
}
catch(err) {
  console.error(err)
}

decrement(key: string, offset?: integer=1): integer

Decrementing item.

let key = mcc.decrement('key', 10)

Function throws Error when:

• key is not provided
• key is not exist

Function throws TypeError when:

• item is not integer
• offset is not integer

try {
  let key = mcc.decrement('key', 10.1)
}
catch(err) {
  console.error(err)
}