codified_data

Simple and fast NodeJS codified caching on redis based on package cache-manager-redis-store.

A simple caching module on redis that has set, get and delete methods and works as a codified cache storage. Keys can have a timeout (ttl) after which they expire and are deleted from the cache. All keys are stored in a redis instance. This package also get other helper function like keys, flushAll, getTtl

Install

  npm install codified_data --save

Or just require the index.js file to get the superclass

Examples:

Initialize (INIT):

setup([options])

Sets and Init redis connection options. It is possible to define a host, port, key ttl (in ms), password and db .

const codifiedData = require( "codified_data" );
codifiedData.setup();
//OR
codifiedData.setup({ttl:0});

Options

• ttl: (default: 0) the standard ttl as number in seconds for every generated cache element. 0 = unlimited
• clear: (default: false) if true flush all key and clear db.
• host:(default: localhost) the redis host.
• port:(default: 6379) the redis port
• db:(default: 0) the redis database
• auth_pass:(default: void) the redis password

Store a key (SET):

set(value, [ options ], callback )

Sets a value to store in cache and if no error return codified key of this stored value. It is possible to define a custom ttl (in seconds) for this key. callback has two parameters err, codifiedKey. If error err contains error message otherwise codifiedKey contains the codified key associated to a new value stored.

obj = { my: "Special", variable: 42 };
codifiedData.set(obj, function( err, key ){
  if( !err && key ){
      // print a string like:  45745c60-7b1a-11e8-9c9c-2d42b21b1a3e
      console.log( key );
  }
});

Options

• ttl: The standard ttl as number in seconds for current cache element. It overwrite global ttl value

Note: If the key expires based on it's ttl it will be deleted.

Retrieve a key (GET):

get( key,[options] [callback] )

Gets a saved value from the cache. Returns a undefined || null if not found or expired. If the value was found it returns the value associated to codified key.

//store a value 
let obj = { my: "Special", variable: 42 };
let storeKey;
codifiedData.set(obj, function( err, key ){
  if( !err && key ){
      // print a string like:  45745c60-7b1a-11e8-9c9c-2d42b21b1a3e
      console.log( key );
      storeKey=key;
  }
});



codifiedData.get(storeKey,{delete:true}, function( err, value ){
  if( !err && value ){
      // print { my: "Special", variable: 42 }
      console.log( value );
  }
});

Options

• delete: if true delete the key from the cache after reading it.

Delete a key (DEL):

deleteKey( key, [callback] )

Delete a key from cache.

codifiedData.deleteKey( "45745c60-7b1a-11e8-9c9c-2d42b21b1a3e", function( err, result ){
  if( !err ){
    console.log( "Deleted" );
    // ... do something ...
  }
});

Get All Keys (KEYS):

keys([callback] )

Get an array of all not expired keys

codifiedData.keys(function( err, keys ){
  if( !err ){
    console.log( keys );
    // ["0df05ef0-8917-11e8-94d7-238224a78e45" ]
  }
});

Flush all data (flushAll):

flushAll([callback])

Flush all data.

codifiedData.flushAll(function( err, result ){
   if( !err ){
         console.log( result );
         // "OK"
       }
 });  

Gwt key ttl (getTtl):

getTtl(key,[callback])

Get the remaining time to live of specified key

codifiedData.getTtl("45745c60-7b1a-11e8-9c9c-2d42b21b1a3e",function( err, result ){
   if( !err ){
         console.log( result );
         // "ttl": 42
       }
 });  

License - "MIT License"

MIT License

Copyright (c) 2016 aromanino

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.

Author

CRS4 Microservice Core Team ([e-mail])

Contributors

Alessandro Romanino ([e-mail])
Guido Porruvecchio ([e-mail])