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224 lines (200 loc) · 5.74 KB
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import type {JSONValue, ToJSON} from './json.js';
import type {
Invoke,
OpenTransactionRequest,
CommitTransactionResponse,
} from './repm-invoker.js';
import type {KeyTypeForScanOptions, ScanOptions} from './scan-options.js';
import {ScanResult} from './scan-iterator.js';
import {throwIfClosed} 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`.
*
* If `options` has an `indexName`, then this does a scan over an index with
* that name. A scan over an index uses a tuple for the key consisting of
* `[secondary: string, primary: string]`.
*
* If the `ScanResult` is used after the `ReadTransaction` has been closed it
* will throw a {@link TransactionClosedError}.
*/
scan<O extends ScanOptions, K extends KeyTypeForScanOptions<O>>(
options?: O,
): ScanResult<K>;
/**
* Convenience form of `scan()` which returns all the entries as an array.
*/
scanAll<O extends ScanOptions, K extends KeyTypeForScanOptions<O>>(
options?: O,
): Promise<[K, JSONValue][]>;
}
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<O extends ScanOptions, K extends KeyTypeForScanOptions<O>>(
options?: O,
): ScanResult<K> {
const {prefix = '', startKey, startKeyExclusive, limit, indexName} =
options || {};
return new ScanResult(
prefix,
startKey,
startKeyExclusive,
limit,
indexName,
this._invoke,
() => this,
false,
);
}
async scanAll<O extends ScanOptions, K extends KeyTypeForScanOptions<O>>(
options?: O,
): Promise<[K, JSONValue][]> {
type E = [K, JSONValue];
const it = this.scan(options).entries();
const result: E[] = [];
for await (const pair of it) {
result.push(pair as E);
}
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>;
/**
* Creates a persistent secondary index in Replicache which can be used with scan.
*
* If the named index already exists with the same definition this returns success
* immediately. If the named index already exists, but with a different definition
* an error is returned.
*/
createIndex({
name,
keyPrefix,
jsonPointer,
}: CreateIndexOptions): Promise<void>;
/**
* Drops an index previously created with {@link createIndex}.
* @param name
*/
dropIndex(name: string): Promise<void>;
}
interface CreateIndexOptions {
name: string;
keyPrefix?: string;
jsonPointer: string;
}
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 createIndex(options: CreateIndexOptions): Promise<void> {
throwIfClosed(this);
await this._invoke('createIndex', {
transactionId: this.id,
name: options.name,
keyPrefix: options.keyPrefix || '',
jsonPointer: options.jsonPointer,
});
}
async dropIndex(name: string): Promise<void> {
throwIfClosed(this);
await this._invoke('dropIndex', {
transactionId: this.id,
name,
});
}
async commit(): Promise<CommitTransactionResponse> {
this._closed = true;
const commitRes = await this._invoke('commitTransaction', {
transactionId: this.id,
});
return commitRes;
}
}