@ngx-pwa/local-storage
Version:
Efficient local storage module for Angular: simple API based on native localStorage API, but internally stored via the asynchronous IndexedDB API for performance, and wrapped in RxJS observables to be homogeneous with other Angular modules.
162 lines • 18.3 kB
JavaScript
import { Injectable, Inject } from '@angular/core';
import { Observable, of, throwError, asyncScheduler } from 'rxjs';
import { observeOn } from 'rxjs/operators';
import { LS_PREFIX } from '../tokens';
import { SerializationError } from './exceptions';
import * as i0 from "@angular/core";
import * as i1 from "../tokens";
export class LocalStorageDatabase {
/**
* Constructor params are provided by Angular (but can also be passed manually in tests)
* @param prefix Prefix option to avoid collision for multiple apps on the same subdomain or for interoperability
*/
constructor(prefix = '') {
/* Prefix if asked, or no prefix otherwise */
this.prefix = prefix || '';
}
/**
* Number of items in `localStorage`
*/
get size() {
/* Wrap in a RxJS `Observable` to be consistent with other storages */
return of(localStorage.length);
}
/**
* Gets an item value in `localStorage`
* @param key The item's key
* @returns The item's value if the key exists, `undefined` otherwise, wrapped in a RxJS `Observable`
*/
get(key) {
/* Get raw data */
const unparsedData = localStorage.getItem(this.prefixKey(key));
let parsedData;
/* No need to parse if data is `null` or `undefined` */
if ((unparsedData !== undefined) && (unparsedData !== null)) {
/* Try to parse */
try {
parsedData = JSON.parse(unparsedData);
}
catch (error) {
return throwError(error);
}
}
/* Wrap in a RxJS `Observable` to be consistent with other storages */
return of(parsedData);
}
/**
* Store an item in `localStorage`
* @param key The item's key
* @param data The item's value
* @returns A RxJS `Observable` to wait the end of the operation
*/
set(key, data) {
let serializedData = null;
/* Check if data can be serialized */
const dataPrototype = Object.getPrototypeOf(data);
if ((typeof data === 'object') && (data !== null) && !Array.isArray(data) &&
!((dataPrototype === Object.prototype) || (dataPrototype === null))) {
return throwError(new SerializationError());
}
/* Try to stringify (can fail on circular references) */
try {
serializedData = JSON.stringify(data);
}
catch (error) {
return throwError(error);
}
/* Can fail if storage quota is exceeded */
try {
localStorage.setItem(this.prefixKey(key), serializedData);
}
catch (error) {
return throwError(error);
}
/* Wrap in a RxJS `Observable` to be consistent with other storages */
return of(undefined);
}
/**
* Deletes an item in `localStorage`
* @param key The item's key
* @returns A RxJS `Observable` to wait the end of the operation
*/
delete(key) {
localStorage.removeItem(this.prefixKey(key));
/* Wrap in a RxJS `Observable` to be consistent with other storages */
return of(undefined);
}
/**
* Deletes all items in `localStorage`
* @returns A RxJS `Observable` to wait the end of the operation
*/
clear() {
localStorage.clear();
/* Wrap in a RxJS `Observable` to be consistent with other storages */
return of(undefined);
}
/**
* Get all keys in `localStorage`
* Note the order of the keys may be inconsistent in Firefox
* @returns A RxJS `Observable` iterating on keys
*/
keys() {
/* Create an `Observable` from keys */
return new Observable((subscriber) => {
/* Iteretate over all the indexes */
for (let index = 0; index < localStorage.length; index += 1) {
/* Cast as we are sure in this case the key is not `null` */
subscriber.next(this.getUnprefixedKey(index));
}
subscriber.complete();
}).pipe(
/* Required to work like other databases which are asynchronous */
observeOn(asyncScheduler));
}
/**
* Check if a key exists in `localStorage`
* @param key The item's key
* @returns A RxJS `Observable` telling if the key exists or not
*/
has(key) {
/* Itérate over all indexes in storage */
for (let index = 0; index < localStorage.length; index += 1) {
if (key === this.getUnprefixedKey(index)) {
/* Wrap in a RxJS `Observable` to be consistent with other storages */
return of(true);
}
}
/* Wrap in a RxJS `Observable` to be consistent with other storages */
return of(false);
}
/**
* Get an unprefixed key
* @param index Index of the key
* @returns The unprefixed key name if exists, `null` otherwise
*/
getUnprefixedKey(index) {
/* Get the key in storage: may have a prefix */
const prefixedKey = localStorage.key(index);
if (prefixedKey !== null) {
/* If no prefix, the key is already good, otherwrite strip the prefix */
return !this.prefix ? prefixedKey : prefixedKey.substr(this.prefix.length);
}
return null;
}
/**
* Add the prefix to a key
* @param key The key name
* @returns The prefixed key name
*/
prefixKey(key) {
return `${this.prefix}${key}`;
}
}
LocalStorageDatabase.ɵprov = i0.ɵɵdefineInjectable({ factory: function LocalStorageDatabase_Factory() { return new LocalStorageDatabase(i0.ɵɵinject(i1.LS_PREFIX)); }, token: LocalStorageDatabase, providedIn: "root" });
LocalStorageDatabase.decorators = [
{ type: Injectable, args: [{
providedIn: 'root'
},] }
];
LocalStorageDatabase.ctorParameters = () => [
{ type: undefined, decorators: [{ type: Inject, args: [LS_PREFIX,] }] }
];
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{ Injectable, Inject } from '@angular/core';\nimport { Observable, of, throwError, asyncScheduler } from 'rxjs';\nimport { observeOn } from 'rxjs/operators';\n\nimport { LS_PREFIX } from '../tokens';\nimport { LocalDatabase } from './local-database';\nimport { SerializationError } from './exceptions';\n\n@Injectable({\n  providedIn: 'root'\n})\nexport class LocalStorageDatabase implements LocalDatabase {\n\n  /**\n   * Optional user prefix to avoid collision for multiple apps on the same subdomain\n   */\n  readonly prefix: string;\n\n  /**\n   * Constructor params are provided by Angular (but can also be passed manually in tests)\n   * @param prefix Prefix option to avoid collision for multiple apps on the same subdomain or for interoperability\n   */\n  constructor(\n    @Inject(LS_PREFIX) prefix = '',\n  ) {\n\n    /* Prefix if asked, or no prefix otherwise */\n    this.prefix = prefix || '';\n\n  }\n\n  /**\n   * Number of items in `localStorage`\n   */\n  get size(): Observable<number> {\n\n    /* Wrap in a RxJS `Observable` to be consistent with other storages */\n    return of(localStorage.length);\n\n  }\n\n  /**\n   * Gets an item value in `localStorage`\n   * @param key The item's key\n   * @returns The item's value if the key exists, `undefined` otherwise, wrapped in a RxJS `Observable`\n   */\n  get<T = unknown>(key: string): Observable<T | undefined> {\n\n    /* Get raw data */\n    const unparsedData = localStorage.getItem(this.prefixKey(key));\n\n    let parsedData: T | undefined;\n\n    /* No need to parse if data is `null` or `undefined` */\n    if ((unparsedData !== undefined) && (unparsedData !== null)) {\n\n      /* Try to parse */\n      try {\n        parsedData = JSON.parse(unparsedData) as T;\n      } catch (error) {\n        return throwError(error as SyntaxError);\n      }\n\n    }\n\n    /* Wrap in a RxJS `Observable` to be consistent with other storages */\n    return of(parsedData);\n\n  }\n\n  /**\n   * Store an item in `localStorage`\n   * @param key The item's key\n   * @param data The item's value\n   * @returns A RxJS `Observable` to wait the end of the operation\n   */\n  set(key: string, data: unknown): Observable<undefined> {\n\n    let serializedData: string | null = null;\n\n    /* Check if data can be serialized */\n    const dataPrototype = Object.getPrototypeOf(data);\n    if ((typeof data === 'object') && (data !== null) && !Array.isArray(data) &&\n    !((dataPrototype === Object.prototype) || (dataPrototype === null))) {\n      return throwError(new SerializationError());\n    }\n\n    /* Try to stringify (can fail on circular references) */\n    try {\n      serializedData = JSON.stringify(data);\n    } catch (error) {\n      return throwError(error as TypeError);\n    }\n\n    /* Can fail if storage quota is exceeded */\n    try {\n      localStorage.setItem(this.prefixKey(key), serializedData);\n    } catch (error) {\n      return throwError(error as DOMException);\n    }\n\n    /* Wrap in a RxJS `Observable` to be consistent with other storages */\n    return of(undefined);\n\n  }\n\n  /**\n   * Deletes an item in `localStorage`\n   * @param key The item's key\n   * @returns A RxJS `Observable` to wait the end of the operation\n   */\n  delete(key: string): Observable<undefined> {\n\n    localStorage.removeItem(this.prefixKey(key));\n\n    /* Wrap in a RxJS `Observable` to be consistent with other storages */\n    return of(undefined);\n\n  }\n\n  /**\n   * Deletes all items in `localStorage`\n   * @returns A RxJS `Observable` to wait the end of the operation\n   */\n  clear(): Observable<undefined> {\n\n    localStorage.clear();\n\n    /* Wrap in a RxJS `Observable` to be consistent with other storages */\n    return of(undefined);\n\n  }\n\n  /**\n   * Get all keys in `localStorage`\n   * Note the order of the keys may be inconsistent in Firefox\n   * @returns A RxJS `Observable` iterating on keys\n   */\n  keys(): Observable<string> {\n\n    /* Create an `Observable` from keys */\n    return new Observable<string>((subscriber) => {\n\n      /* Iteretate over all the indexes */\n      for (let index = 0; index < localStorage.length; index += 1) {\n\n        /* Cast as we are sure in this case the key is not `null` */\n        subscriber.next(this.getUnprefixedKey(index) as string);\n\n      }\n\n      subscriber.complete();\n\n    }).pipe(\n      /* Required to work like other databases which are asynchronous */\n      observeOn(asyncScheduler),\n    );\n\n  }\n\n  /**\n   * Check if a key exists in `localStorage`\n   * @param key The item's key\n   * @returns A RxJS `Observable` telling if the key exists or not\n   */\n  has(key: string): Observable<boolean> {\n\n    /* Itérate over all indexes in storage */\n    for (let index = 0; index < localStorage.length; index += 1) {\n\n      if (key === this.getUnprefixedKey(index)) {\n\n        /* Wrap in a RxJS `Observable` to be consistent with other storages */\n        return of(true);\n\n      }\n\n    }\n\n    /* Wrap in a RxJS `Observable` to be consistent with other storages */\n    return of(false);\n\n  }\n\n  /**\n   * Get an unprefixed key\n   * @param index Index of the key\n   * @returns The unprefixed key name if exists, `null` otherwise\n   */\n  protected getUnprefixedKey(index: number): string | null {\n\n    /* Get the key in storage: may have a prefix */\n    const prefixedKey = localStorage.key(index);\n\n    if (prefixedKey !== null) {\n\n      /* If no prefix, the key is already good, otherwrite strip the prefix */\n      return !this.prefix ? prefixedKey : prefixedKey.substr(this.prefix.length);\n\n    }\n\n    return null;\n\n  }\n\n  /**\n   * Add the prefix to a key\n   * @param key The key name\n   * @returns The prefixed key name\n   */\n  protected prefixKey(key: string): string {\n\n    return `${this.prefix}${key}`;\n\n  }\n\n}\n"]}