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162 lines (142 loc) · 4.16 KB
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import type {JSONValue, ToJSON} from './json.js';
import type {
Invoke,
OpenTransactionRequest,
CommitTransactionResponse,
} from './repm-invoker.js';
import type {ScanOptions} from './scan-options.js';
import {ScanResult} from './scan-iterator.js';
import {TransactionClosedError} from './transaction-closed-error.js';
/**
* ReadTransactions are used with `Replicache.query` and allows read operations
* on the database.
*/
export interface ReadTransaction {
/**
* Get a single value from the database. If the key is not present this
* returns `undefined`.
*/
get(key: string): Promise<JSONValue | undefined>;
/**
* Determines if a single key is present in the database.
*/
has(key: string): Promise<boolean>;
/**
* Gets many values from the database. This returns a `ScanResult` which
* implements `AsyncIterable`. It also has methods to iterate over the `keys`
* and `entries`.
*
* It the `ScanResult` is used after the `ReadTransaction` has been closed it
* will throw a {@link TransactionClosedError}.
*/
scan(options?: ScanOptions): ScanResult;
/**
* Convenience for scan() that reads all results into an array.
*/
scanAll(options?: ScanOptions): Promise<[string, JSONValue][]>;
}
export function throwIfClosed(tx: {closed: boolean}): void {
if (tx.closed) {
throw new TransactionClosedError();
}
}
export class ReadTransactionImpl implements ReadTransaction {
private _transactionId = -1;
protected readonly _invoke: Invoke;
protected _closed = false;
constructor(invoke: Invoke) {
this._invoke = invoke;
}
async get(key: string): Promise<JSONValue | undefined> {
throwIfClosed(this);
const result = await this._invoke('get', {
transactionId: this._transactionId,
key,
});
if (!result.has) {
return undefined;
}
return JSON.parse(result.value);
}
async has(key: string): Promise<boolean> {
throwIfClosed(this);
const result = await this._invoke('has', {
transactionId: this._transactionId,
key,
});
return result['has'];
}
scan({prefix = '', start}: ScanOptions = {}): ScanResult {
return new ScanResult(prefix, start, this._invoke, () => this, false);
}
async scanAll(options: ScanOptions = {}): Promise<[string, JSONValue][]> {
const it = this.scan(options).entries();
const result = [];
for await (const pair of it) {
result.push(pair);
}
return result;
}
get id(): number {
return this._transactionId;
}
get closed(): boolean {
return this._closed;
}
async open(args: OpenTransactionRequest): Promise<void> {
const {transactionId} = await this._invoke('openTransaction', args);
this._transactionId = transactionId;
}
async close(): Promise<void> {
try {
this._closed = true;
await this._invoke('closeTransaction', {
transactionId: this._transactionId,
});
} catch (ex) {
console.error('Failed to close transaction', ex);
}
}
}
/**
* WriteTransactions are used with `Replicache.register` and allows read and
* write operations on the database.
*/
export interface WriteTransaction extends ReadTransaction {
/**
* Sets a single value in the database. The `value` will be encoded using
* `JSON.stringify`.
*/
put(key: string, value: JSONValue | ToJSON): Promise<void>;
/**
* Removes a key and its value from the database. Returns true if there was a
* key to remove.
*/
del(key: string): Promise<boolean>;
}
export class WriteTransactionImpl extends ReadTransactionImpl
implements WriteTransaction {
async put(key: string, value: JSONValue | ToJSON): Promise<void> {
throwIfClosed(this);
await this._invoke('put', {
transactionId: this.id,
key,
value: JSON.stringify(value),
});
}
async del(key: string): Promise<boolean> {
throwIfClosed(this);
const result = await this._invoke('del', {
transactionId: this.id,
key,
});
return result.ok;
}
async commit(): Promise<CommitTransactionResponse> {
this._closed = true;
const commitRes = await this._invoke('commitTransaction', {
transactionId: this.id,
});
return commitRes;
}
}