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easy-storage.js
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easy-storage.js
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/** @about Easy Storage 1.0.7 @zeppos 1.0 @author: Silver, Zepp Health. @license: MIT */
const ES_DEFAULT_FILE_NAME = "easy_storage.json";
export class Storage {
static WriteJson(filename, json){
saveJson(filename, json);
}
static ReadJson(filename){
return loadJson(filename);
}
static WriteFile(filename, data){
writeFile(filename, data);
}
static ReadFile(filename){
return readFile(filename);
}
static WriteAsset(filename, data){
writeAsset(filename, data);
}
static ReadAsset(filename){
return readAsset(filename);
}
}
export class EasyStorage {
#filename; // specify the name of you database
#content_obj = {};
#autosave = true; // should autosave on each write action?
constructor(filename=ES_DEFAULT_FILE_NAME) {
this.#filename = filename;
this.#content_obj = loadJson(filename);
}
/**
* @param {*} key
* @param {*} value
* @comment saves the VALUE into the specified KEY.
*/
setKey(key, value) {
this.#content_obj[key] = value;
if (this.#autosave) this.saveAll();
}
/**
* @param {*} key
* @param {*} default_value
* @returns value if found or default value if assigned. Otherwise "undefined".
*/
getKey(key, default_value = "") {
if (this.#content_obj.hasOwnProperty(key)) {
return this.#content_obj[key].toString();
} return default_value !== "" ? default_value : "undefined";
}
/**
* @param key
* @returns TRUE/FALSE depending if the key exists in the storage.
*/
hasKey(key) {
return this.#content_obj.hasOwnProperty(key);
}
/**
* @param key
* @comment removes the KEY from the storage.
*/
removeKey(key) {
delete this.#content_obj[key];
if (this.#autosave) this.saveAll();
}
/**
* @comment writes all the KEYS into the storage for the case when AUTOSAVE_ENABLED is turned off.
*/
saveAll() {
saveJson(this.#filename, this.#content_obj);
}
/**
* @comment removes all the KEYS from the storage. If autosave is enabled saves the changes to the file.
*/
deleteAll() {
this.#content_obj = {};
if (this.#autosave) this.saveAll();
}
/**
* @returns a STRING of all contents in the storage.
*/
printContents() { console.log("Storage contents: " + JSON.stringify(this.#content_obj)); }
/**
* @returns the whole object stored in the storage.
*/
getContents() { return JSON.stringify(this.#content_obj); } // @upd 1.0.7
setAutosave(bool){ this.#autosave = bool; }
getStorageFilename() { return this.#filename; }
}
function writeFile(filename, data){
const buffer = str2ab(data);
const file = hmFS.open(filename, hmFS.O_RDWR | hmFS.O_TRUNC);
hmFS.write(file, buffer, 0, buffer.byteLength);
hmFS.close(file);
}
function readFile(filename){
const [fs_stat, err] = hmFS.stat(filename);
if (err === 0) {
const { size } = fs_stat;
const file_content_buffer = new Uint16Array(new ArrayBuffer(size));
const file = hmFS.open(filename, hmFS.O_RDONLY | hmFS.O_CREAT);
hmFS.seek(file, 0, hmFS.SEEK_SET);
hmFS.read(file, file_content_buffer.buffer, 0, size);
hmFS.close(file);
return String.fromCharCode.apply(null, file_content_buffer);
} else { } // file not found handler
}
function writeAsset(filename, data) {
const buffer = str2ab(data); //data
const file = hmFS.open_asset(filename, hmFS.O_WRONLY | hmFS.O_CREAT);
hmFS.write(file, buffer, 0, buffer.byteLength);
hmFS.close(file);
}
function readAsset(filename){
const [fs_stat, err] = hmFS.stat_asset(filename);
if (err === 0) {
const { size } = fs_stat;
const file_content_buffer = new Uint16Array(new ArrayBuffer(size));
const file = hmFS.open_asset(filename, hmFS.O_RDONLY | hmFS.O_CREAT);
hmFS.seek(file, 0, hmFS.SEEK_SET);
hmFS.read(file, file_content_buffer.buffer, 0, size);
hmFS.close(file);
return String.fromCharCode.apply(null, file_content_buffer);
} else { } // file not found handler
}
function saveJson(filename, json) {
writeFile(filename, JSON.stringify(json));
}
function loadJson(filename) {
let json = {};
try {
const val = readFile(filename);
json = val ? JSON.parse(val) : {};
} catch (error) {
json = {};
} return json;
}
function str2ab(str) {
const buf = new ArrayBuffer(str.length * 2); // 2 bytes for each char
const buf_view = new Uint16Array(buf);
for (let i = 0, strLen = str.length; i < strLen; i++) {
buf_view[i] = str.charCodeAt(i);
} return buf;
}
// var hex_string = "Hello World!".toHex();
// console.log(hex_string) // "48656c6c6f20576f726c6421"
String.prototype.toHex = function () {
var result = "";
for (var i = 0; i < this.length; i++) {
result += this.charCodeAt(i).toString(16);
}
return result;
}
// var hex_string = "48656c6c6f20576f726c6421";
// console.log(hex_string.fromHex()); // "Hello World!"
String.prototype.fromHex = function () {
var hex_string = this.toString(); // Ensure we have a string
var result = "";
for (var i = 0; i < hex_string.length; i += 2) {
result += String.fromCharCode(parseInt(hex_string.substr(i, 2), 16));
} return result;
}
/**
* @changelog
* 1.0.0
* - initial release
* 1.0.3
* - (fix) "return this.#content_obj[key]" was returning null without typecast; now returns strict string
* - (add) possibility to write/read arbitrary files
* - (add) separation between manual writes and easystorage
* 1.0.5
* - consistency
* - toHex / fromHex string extensions
* 1.0.6
* - getContents() that retrieves whole contents of the storage as a JSON object
* 1.0.7
* - getContents() returns a stringified version of JSON object (as in the original easy-save library)
*/