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import { captureStack } from '@anchorlib/core';
import { type Connection, type DBEvent, type DBSubscriber, type DBUnsubscribe, IDBStatus } from './types.js';
export const DB_NAME = 'anchor';
export const DB_SYNC_DELAY = 100;
export const DB_CONNECTIONS = new Map<string, Connection>();
/**
* Creates a new IndexedDB connection with the specified name and version.
*
* This function initializes a connection object that manages the IndexedDB lifecycle,
* including opening, upgrading, loading, and closing the database. It handles all
* the necessary event callbacks and maintains the connection state.
*
* @param name - The name of the database to connect to
* @param version - The version number of the database schema
* @returns A Connection object that represents the database connection
*/
const createConnection = (name: string, version: number): Connection => {
if (hasIndexedDb()) {
const connection = {
name,
version,
status: IDBStatus.Idle,
onUpgrade: new Set(),
onLoaded: new Set(),
onClosed: new Set(),
onError: new Set(),
open: () => {
const request = indexedDB.open(connection.name, connection.version);
request.onupgradeneeded = (event) => {
const db = (event.target as IDBOpenDBRequest)?.result;
const transaction = (event.target as IDBOpenDBRequest).transaction;
if (!db || !transaction) {
throw new Error(`Unable to upgrade database: ${connection.name}@${connection.version}.`);
}
for (const upgrade of connection.onUpgrade) {
upgrade(event);
}
};
request.onsuccess = async () => {
connection.instance = request.result;
connection.status = IDBStatus.Open;
for (const load of connection.onLoaded) {
await load(request.result);
}
};
request.onerror = () => {
connection.error = request.error;
connection.status = IDBStatus.Closed;
for (const reject of connection.onError) {
reject(request.error);
}
};
return connection;
},
close: (error) => {
DB_CONNECTIONS.delete(connection.name);
if (error) {
connection.error = error;
}
connection.status = IDBStatus.Closed;
connection.instance?.close();
for (const close of connection.onClosed) {
close(error);
}
},
} as Connection;
DB_CONNECTIONS.set(connection.name, connection);
return connection;
} else {
return {
name,
version,
error: new Error('IndexedDB is not available.'),
status: IDBStatus.Closed,
close: () => {},
} as Connection;
}
};
/**
* IndexedStore is a class that manages IndexedDB connections and provides
* a high-level interface for database operations. It handles connection
* lifecycle management, including initialization, opening, closing, and
* version upgrades.
*
* The class provides event subscription capabilities to monitor database
* status changes and supports both synchronous and asynchronous setup
* operations during database initialization.
*/
export class IndexedStore {
/**
* Set of subscribers that are notified of database status changes
* @private
*/
#subscribers = new Set<DBSubscriber>();
/**
* Gets the full connection name including the database name prefix
* @protected
* @returns The formatted connection name
*/
protected get connectionName() {
return `${DB_NAME}://${this.dbName}`;
}
/**
* The underlying database connection object
*/
public connection: Connection;
/**
* Current status of the database connection
*/
public status = IDBStatus.Idle;
/**
* Error that occurred during database operations, if any
*/
public error?: Error;
/**
* Gets the underlying IndexedDB database instance
* @returns The IDBDatabase instance or undefined if not open
*/
public get instance(): IDBDatabase | undefined {
return this.connection.instance;
}
/**
* Creates a new IndexedStore instance
* @param dbName - The name of the database
* @param version - The version of the database schema (default: 1)
*/
constructor(
protected dbName: string,
protected version = 1
) {
this.connection = DB_CONNECTIONS.get(this.connectionName) as Connection;
if (!this.connection) {
this.connection = createConnection(this.connectionName, version);
}
if (version > this.connection.version) {
this.connection.version = version;
}
this.status = this.connection.status;
this.error = this.connection.error as Error;
}
/**
* Initializes the database connection by setting up event handlers
* for upgrade, load, error, and close events. This method should be
* called before opening the database.
*
* @returns This IndexedStore instance for method chaining
*/
public init(): this {
const connection = this.connection;
if (connection.status === IDBStatus.Idle) {
this.status = connection.status = IDBStatus.Init;
}
if (connection.status === IDBStatus.Init) {
connection.onUpgrade.add((event: IDBVersionChangeEvent) => {
try {
this.upgrade?.(event);
} catch (error) {
this.error = error as Error;
this.status = IDBStatus.Closed;
this.finalize();
}
});
connection.onClosed.add((error) => {
if (error) {
this.error = error;
}
this.status = IDBStatus.Closed;
this.publish({ type: IDBStatus.Closed });
});
connection.onLoaded.add(async () => {
if (this.status !== IDBStatus.Init) return;
try {
await this.setup?.();
this.status = IDBStatus.Open;
} catch (error) {
this.error = error as Error;
this.status = IDBStatus.Closed;
}
this.finalize();
});
connection.onError.add((error) => {
this.error = error as Error;
this.status = IDBStatus.Closed;
this.finalize();
});
} else {
this.connection.onClosed?.add((error) => {
if (error) {
this.error = error;
}
this.status = IDBStatus.Closed;
this.publish({ type: IDBStatus.Closed });
});
if (connection.status === IDBStatus.Open) {
(async () => {
this.status = IDBStatus.Init;
try {
await this.setup?.();
this.status = IDBStatus.Open;
} catch (error) {
captureStack.error.external(
`Unable to finish the Database setup of "${this.dbName}".`,
error as Error,
this.init
);
this.error = error as Error;
this.status = IDBStatus.Closed;
} finally {
this.finalize();
}
})();
} else {
this.finalize();
}
}
return this;
}
/**
* Opens the database connection. This method triggers the actual
* IndexedDB open operation.
*
* @returns This IndexedStore instance for method chaining
*/
public open(): this {
this.connection?.open?.();
return this;
}
/**
* Closes the database connection
* @param error - Optional error that caused the close
*/
public close(error?: Error) {
this.connection.close(error);
}
/**
* Finalizes the initialization process by publishing the current status
* @protected
*/
protected finalize(): void {
this.publish({ type: this.status });
}
/**
* Publishes a database event to all subscribers
* @param event - The database event to publish
* @protected
*/
protected publish(event: DBEvent) {
for (const subscriber of this.#subscribers) {
if (isFunction(subscriber)) {
subscriber(event);
}
}
}
/**
* Subscribes to database status changes
* @param handler - The function to call when status changes
* @returns A function to unsubscribe from status changes
*/
public subscribe(handler: DBSubscriber): DBUnsubscribe {
this.#subscribers.add(handler);
return () => {
this.#subscribers.delete(handler);
};
}
/**
* Optional method that is called when the database version needs to be upgraded.
* Override this method in subclasses to define database schema changes.
* @param event - The version change event
* @protected
*/
protected upgrade?(event: IDBVersionChangeEvent): void;
/**
* Optional method that is called after the database is opened.
* Override this method in subclasses to perform any additional setup.
* @protected
*/
protected setup?(): Promise<void> | void;
/**
* Returns a promise that resolves when the database reaches either
* the Open or Closed state. If the database is already in one of
* these states, the promise resolves immediately.
*
* @returns A promise that resolves with the database event
*/
public async promise(): Promise<DBEvent> {
if (this.status !== IDBStatus.Init) {
return { type: this.status };
}
return await new Promise((resolve) => {
const unsubscribe = this.subscribe((event) => {
if (event.type === IDBStatus.Open || event.type === IDBStatus.Closed) {
resolve(event);
unsubscribe();
}
});
});
}
}
const hasIndexedDb = () => typeof indexedDB !== 'undefined';
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