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import {
anchor,
captureStack,
derive,
type LinkableSchema,
microtask,
type ObjLike,
type State,
type StateOptions,
type StateUnsubscribe,
} from '@anchorlib/core';
import { isBrowser } from '@beerush/utils';
import type { SessionFn } from './types.js';
export const STORAGE_KEY = 'anchor';
export const STORAGE_SYNC_DELAY = 100;
const hasSessionStorage = () => typeof sessionStorage !== 'undefined';
/**
* SessionStorage is a class that extends MemoryStorage to provide session storage functionality.
* It automatically syncs with the browser's sessionStorage and handles versioning of stored data.
*
* @template T - The type of the stored data, must be a Record<string, unknown>
*/
export class SessionStorage<T extends Record<string, unknown> = Record<string, unknown>> extends MemoryStorage<T> {
public static key(name: string, version = '1.0.0') {
return `${STORAGE_KEY}-session://${name}@${version}`;
}
/**
* Returns the storage key with the current version
*/
public get key(): string {
return SessionStorage.key(this.name, this.version);
}
/**
* Returns the storage key with the previous version (used for cleanup)
*/
public get oldKey(): string {
return SessionStorage.key(this.name, this.previousVersion);
}
/**
* Creates a new SessionStorage instance
*
* @param name - The name of the storage
* @param init - Initial data to populate the storage
* @param version - Version of the storage schema (default: '1.0.0')
* @param previousVersion - Previous version to clean up
* @param adapter - Storage adapter (defaults to window.sessionStorage)
*/
constructor(
protected name: string,
protected init?: T,
protected version = '1.0.0',
protected previousVersion?: string,
protected adapter?: Storage
) {
super(init);
if (!adapter && hasSessionStorage()) {
this.adapter = sessionStorage;
}
if (this.adapter) {
if (this.previousVersion) {
this.adapter.removeItem(this.oldKey);
}
const stored = this.adapter.getItem(this.key);
if (stored) {
try {
const storedData = JSON.parse(stored) as Record<string, unknown>;
this.assign(storedData);
} catch (error) {
captureStack.error.external(
['Unable to parse storage object from the persistent storage:', stored].join('\n\n'),
error as Error,
this.constructor
);
}
} else if (this.length) {
this.adapter.setItem(this.key, this.json());
}
}
}
/**
* Sets a value in the storage and persists it to sessionStorage
*
* @param key - The key to set
* @param value - The value to store
*/
public set(key: keyof T, value: T[keyof T]) {
super.set(key, value);
this.write();
}
/**
* Deletes a key from storage and updates sessionStorage
*
* @param key - The key to delete
*/
public delete(key: keyof T) {
super.delete(key);
this.write();
}
/**
* Writes the current storage state to the sessionStorage adapter
*/
public write() {
if (typeof this.adapter === 'undefined') return;
try {
if (this.length > 0) {
this.adapter?.setItem(this.key, this.json());
} else {
this.adapter?.removeItem(this.key);
}
} catch (error) {
captureStack.error.external(
`Unable to write storage: "${this.key}".`,
error as Error,
this.write,
this.delete,
this.set
);
}
}
}
const STORAGE_MAP = new Map<string, State>();
const STORAGE_SYNC = new Map<string, ObjLike>();
const STORAGE_USAGE = new Map<string, number>();
const STORAGE_REGISTRY = new WeakMap<ObjLike, SessionStorage>();
const STORAGE_SUBSCRIPTION_REGISTRY = new WeakMap<ObjLike, StateUnsubscribe>();
export function flushStorageCache() {
STORAGE_MAP.clear();
STORAGE_SYNC.clear();
STORAGE_USAGE.clear();
}
let storageChangeListened = false;
/**
* Creates a reactive session object that automatically syncs with sessionStorage.
* The session object will persist data across page reloads within the same browser session.
*
* @template T - The type of the initial data object
* @template S - The schema type for anchor options
*
* @param name - Unique identifier for the session storage instance
* @param init - Initial data to populate the session storage
* @param options - Optional anchor configuration options
* @param storageClass - Custom storage class to use (defaults to SessionStorage)
*
* @returns A reactive proxy object that syncs with sessionStorage
*/
export const session = (<T extends ObjLike, S extends LinkableSchema = LinkableSchema>(
name: string,
init: T,
options?: StateOptions<S>,
storageClass = SessionStorage
): T => {
const [cName, cVersion = '1.0.0'] = name.split('@');
const [cNewVersion, cOldVersion] = cVersion.split(':');
const key = storageClass.key(cName, cNewVersion);
if (STORAGE_MAP.has(key)) {
const usage = STORAGE_USAGE.get(key) as number;
STORAGE_USAGE.set(key, usage + 1);
return STORAGE_MAP.get(key) as T;
}
const state = anchor(init, options);
STORAGE_MAP.set(key, state);
STORAGE_USAGE.set(key, 1);
if (isBrowser() && !STORAGE_REGISTRY.has(state)) {
const storage = new storageClass(cName, state, cNewVersion, cOldVersion) as SessionStorage;
STORAGE_REGISTRY.set(state, storage);
const controller = derive.resolve(state);
if (typeof controller?.subscribe === 'function') {
const [schedule] = microtask(STORAGE_SYNC_DELAY);
STORAGE_SYNC.set(key, state);
const stateUnsubscribe = controller.subscribe(() => {
schedule(() => {
storage?.write();
});
});
const unsubscribe = () => {
let usage = STORAGE_USAGE.get(key) as number;
usage -= 1;
if (usage <= 0) {
stateUnsubscribe?.();
STORAGE_MAP.delete(key);
STORAGE_USAGE.delete(key);
STORAGE_SYNC.delete(key);
STORAGE_REGISTRY.delete(state);
STORAGE_SUBSCRIPTION_REGISTRY.delete(state);
} else {
STORAGE_USAGE.set(key, usage);
}
};
STORAGE_SUBSCRIPTION_REGISTRY.set(state, unsubscribe);
}
// Lazily subscribe to storage changes.
// This make sure that storage subscription is only created once, when needed.
if (!storageChangeListened) {
storageChangeListened = true;
listenStorageChange();
}
}
return state;
}) as SessionFn;
/**
* Disconnects a reactive session object from sessionStorage synchronization.
*
* @template T - The type of the session object
* @param state - The reactive session object to disconnect
*/
session.leave = <T extends ObjLike>(state: T) => {
const unsubscribe = STORAGE_SUBSCRIPTION_REGISTRY.get(state);
if (typeof unsubscribe === 'function') {
unsubscribe();
}
};
/**
* This function add handler to storage change event.
* This function must be called only once and lazily.
*/
function listenStorageChange() {
const storageHandler = (event: StorageEvent) => {
if (!event.key) return;
if (STORAGE_SYNC.has(event.key)) {
const state = STORAGE_SYNC.get(event.key) as ObjLike;
try {
const data = JSON.parse(event.newValue ?? '');
anchor.assign(state, data as ObjLike);
} catch (error) {
captureStack.error.external(
[`Unable to parse new value of "${event.key}":`, event.newValue].join('\n\n'),
error as Error,
storageHandler
);
}
}
};
window.addEventListener('storage', storageHandler);
}
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