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cachescribe

About ❓

a simple cache that can persist in the file system across different runs of your program.

Usage ✨

Installation

npm install cachescribe

Initialization

note: when a cache is created it tries to load entries from the snapshot file synchronously then clears all expired entries, if not found it will start as a new empty cache. it also attaches listeners on the process to create a snapshot file automatically on exit.

import { cachescribe } from 'cachescribe';

const cache = cachescribe();

you can pass an object to configure these options upon initialization:

namespace: unique identifier that will be used for snapshot file name generation to avoid overwrites by other caches (default: 'default')

directory: the directory where the snapshot file will be written in (default: 'node_modules/.cache/cachescribe').

extension: file extension to be used for the cache snapshot file (default: '')

algorithm: hashing algorithm to be used for snapshot filename generation (default: md5)

ttl: duration in seconds of the standard time to live for entires, if duration set to zero then it's infinite (default: 0)

hash: hashing function that will be used for cache filename generation (default: node:crypto)

snapshot: should the cache create snapshot files and read from them or not (default: true)

transformer: a transformer that will serialize and deserialize the cache entries to be written in the snapshot file (default: superjson)

API

set:

sets a key and value pair. it is possible to define a ttl (in seconds).

import { cachescribe } from 'cachescribe';

const cache = cachescribe();

cache.set('key', 'value', 10);

mset:

sets multiple key and value pairs. it is possible to define a ttl (in seconds).

import { cachescribe } from 'cachescribe';

const cache = cachescribe();

cache.mset(
  { key: 'key1', value: 'value1', ttl: 10 },
  { key: 'key2', value: 'value2' },
  { key: 'key3', value: 'value3' },
);

get:

gets a value from the cache. returns undefined if not found or expired.

import { cachescribe } from 'cachescribe';

const cache = cachescribe();

cache.set('key', 'value');

const value = cache.get('key');

if (value) {
  // 'value' 
}

mget:

gets multiple entries at once.

import { cachescribe } from 'cachescribe';

const cache = cachescribe();

cache.set('key1', 'value1');

cache.set('key2', 'value2');

const values = cache.mget('key1', 'key2');
// { key1: 'value1', key2: 'value2' }

take:

gets a value of an entry then removes it from the cache.

import { cachescribe } from 'cachescribe';

const cache = cachescribe();

cache.set('key', 'value');

const value = cache.take('key');
// 'value'

mtake:

gets multiple values of entries then removes them from the cache.

import { cachescribe } from 'cachescribe';

const cache = cachescribe();

cache.set('key1', 'value1');

cache.set('key2', 'value2');

const values = cache.mtake('key1', 'key2');
// { key1: 'value1', key2: 'value2' }

has:

checks whether an entry with the given key exists or not.

import { cachescribe } from 'cachescribe';

const cache = cachescribe();

cache.set('key', 'value');

const exists = cache.has('key');
// true

mhas:

checks whether a list of entries with the given keys all exists or not.

import { cachescribe } from 'cachescribe';

const cache = cachescribe();

cache.set('key1', 'value1');
cache.set('key2', 'value2');

cache.mhas('key1', 'key2');
// true

del:

removes any entry from the cache.

import { cachescribe } from 'cachescribe';

const cache = cachescribe();

cache.set('key', 'value');

const deleted = cache.del('key');
// true

cache.has('key');
// false

mdel:

removes entries from the cache.

import { cachescribe } from 'cachescribe';

const cache = cachescribe();

cache.set('key1', 'value1');
cache.set('key2', 'value2');

cache.mdel('key1', 'key2');

ttl:

changes the time to live for a specific cached entry.

import { cachescribe } from 'cachescribe';

const cache = cachescribe();

cache.set('key', 'value', 10);

cache.ttl('key', 3);

flush:

removes all entries in the cache.

import { cachescribe } from 'cachescribe';

const cache = cachescribe();

cache.set('key1', 'value1');
cache.set('key2', 'value2');

cache.flush();

cache.has('key1');
// false

keys:

returns an iterable iterator of cache entry keys.

import { cachescribe } from 'cachescribe';

const cache = cachescribe();

cache.set('key1', 'value1');
cache.set('key2', 'value2');

for (const key of cache.keys()) {
  // ...
}

values:

returns an iterable iterator of cache entry values.

import { cachescribe } from 'cachescribe';

const cache = cachescribe();

cache.set('key1', 'value1');
cache.set('key2', 'value2');

for (const value of cache.values()) {
  // ...
}

entries:

returns an iterable iterator of cache key-value pairs.

import { cachescribe } from 'cachescribe';

const cache = cachescribe();

cache.set('key1', 'value1');
cache.set('key2', 'value2');

for (const [key, value] of cache.entries()) {
  // ...
}

Contribution 💡

feel free to contribute to this project but please read the contributing guidelines before opening an issue or pull request so you understand the branching strategy and local development environment.