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var path = require( 'path' );
var fs = require( 'graceful-fs' );
var del = require( 'del' ).sync;
var utils = require( './utils' );
var writeJSON = utils.writeJSON;
var cache = {
/**
* Load a cache identified by the given Id. If the element does not exists, then initialize an empty
* cache storage. If specified `cacheDir` will be used as the directory to persist the data to. If omitted
* then the cache module directory `./cache` will be used instead
*
* @method load
* @param docId {String} the id of the cache, would also be used as the name of the file cache
* @param [cacheDir] {String} directory for the cache entry
*/
load: function ( docId, cacheDir ) {
var me = this;
me._visited = { };
me._persisted = { };
me._pathToFile = cacheDir ? path.resolve( cacheDir, docId ) : path.resolve( __dirname, './.cache/', docId );
if ( fs.existsSync( me._pathToFile ) ) {
me._persisted = utils.tryParse( me._pathToFile, { } );
}
},
/**
* Load the cache from the provided file
* @method loadFile
* @param {String} pathToFile the path to the file containing the info for the cache
*/
loadFile: function ( pathToFile ) {
var me = this;
var dir = path.dirname( pathToFile );
var fName = path.basename( pathToFile );
me.load( fName, dir );
},
keys: function () {
return Object.keys( this._persisted );
},
/**
* sets a key to a given value
* @method setKey
* @param key {string} the key to set
* @param value {object} the value of the key. Could be any object that can be serialized with JSON.stringify
*/
setKey: function ( key, value ) {
this._visited[ key ] = true;
this._persisted[ key ] = value;
},
/**
* remove a given key from the cache
* @method removeKey
* @param key {String} the key to remove from the object
*/
removeKey: function ( key ) {
delete this._visited[ key ]; // esfmt-ignore-line
delete this._persisted[ key ]; // esfmt-ignore-line
},
/**
* Return the value of the provided key
* @method getKey
* @param key {String} the name of the key to retrieve
* @returns {*} the value from the key
*/
getKey: function ( key ) {
this._visited[ key ] = true;
return this._persisted[ key ];
},
/**
* Remove keys that were not accessed/set since the
* last time the `prune` method was called.
* @method _prune
* @private
*/
_prune: function () {
var me = this;
var obj = { };
var keys = Object.keys( me._visited );
// no keys visited for either get or set value
if ( keys.length === 0 ) {
return;
}
keys.forEach( function ( key ) {
obj[ key ] = me._persisted[ key ];
} );
me._visited = { };
me._persisted = obj;
},
/**
* Save the state of the cache identified by the docId to disk
* as a JSON structure
* @param [noPrune=false] {Boolean} whether to remove from cache the non visited files
* @method save
*/
save: function ( noPrune ) {
var me = this;
(!noPrune) && me._prune();
writeJSON( me._pathToFile, me._persisted );
},
/**
* remove the file where the cache is persisted
* @method removeCacheFile
* @return {Boolean} true or false if the file was successfully deleted
*/
removeCacheFile: function () {
return del( this._pathToFile, { force: true } );
},
/**
* Destroy the file cache and cache content.
* @method destroy
*/
destroy: function () {
var me = this;
me._visited = { };
me._persisted = { };
me.removeCacheFile();
}
};
module.exports = {
/**
* Alias for create. Should be considered depreacted. Will be removed in next releases
*
* @method load
* @param docId {String} the id of the cache, would also be used as the name of the file cache
* @param [cacheDir] {String} directory for the cache entry
* @returns {cache} cache instance
*/
load: function ( docId, cacheDir ) {
return this.create( docId, cacheDir );
},
/**
* Load a cache identified by the given Id. If the element does not exists, then initialize an empty
* cache storage.
*
* @method create
* @param docId {String} the id of the cache, would also be used as the name of the file cache
* @param [cacheDir] {String} directory for the cache entry
* @returns {cache} cache instance
*/
create: function ( docId, cacheDir ) {
var obj = Object.create( cache );
obj.load( docId, cacheDir );
return obj;
},
createFromFile: function ( filePath ) {
var obj = Object.create( cache );
obj.loadFile( filePath );
return obj;
},
/**
* Clear the cache identified by the given id. Caches stored in a different cache directory can be deleted directly
*
* @method clearCache
* @param docId {String} the id of the cache, would also be used as the name of the file cache
* @param cacheDir {String} the directory where the cache file was written
* @returns {Boolean} true if the cache folder was deleted. False otherwise
*/
clearCacheById: function ( docId, cacheDir ) {
var filePath = cacheDir ? path.resolve( cacheDir, docId ) : path.resolve( __dirname, './.cache/', docId );
return del( filePath, { force: true } ).length > 0;
},
/**
* Remove all cache stored in the cache directory
* @method clearAll
* @returns {Boolean} true if the cache folder was deleted. False otherwise
*/
clearAll: function ( cacheDir ) {
var filePath = cacheDir ? path.resolve( cacheDir ) : path.resolve( __dirname, './.cache/' );
return del( filePath, { force: true } ).length > 0;
}
};