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260 lines (229 loc) · 7 KB
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import type {JSONValue} from './json.js';
import {
Invoke,
OpenTransactionRequest,
CommitTransactionResponse,
RPC,
} 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
* [[Replicache.subscribe]] 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>;
/** Whether the database is empty. */
isEmpty(): Promise<boolean>;
/**
* Gets many values from the database. This returns a [[ScanResult]] which
* implements `AsyncIterable`. It also has methods to iterate over the [[ScanResult.keys|keys]]
* and [[ScanResult.entries|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 [[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;
protected readonly _openTransactionName:
| RPC.OpenTransaction
| RPC.OpenIndexTransaction = RPC.OpenTransaction;
constructor(invoke: Invoke) {
this._invoke = invoke;
}
async get(key: string): Promise<JSONValue | undefined> {
throwIfClosed(this);
const result = await this._invoke(RPC.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(RPC.Has, {
transactionId: this._transactionId,
key,
});
return result['has'];
}
async isEmpty(): Promise<boolean> {
throwIfClosed(this);
let empty = true;
await this._invoke(RPC.Scan, {
transactionId: this._transactionId,
opts: {limit: 1},
receiver: () => (empty = false),
});
return empty;
}
scan<O extends ScanOptions, K extends KeyTypeForScanOptions<O>>(
options?: O,
): ScanResult<K> {
return new ScanResult(options, 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(this._openTransactionName, args);
this._transactionId = transactionId;
}
async close(): Promise<void> {
try {
this._closed = true;
await this._invoke(RPC.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): 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): Promise<void> {
throwIfClosed(this);
await this._invoke(RPC.Put, {
transactionId: this.id,
key,
value: JSON.stringify(value),
});
}
async del(key: string): Promise<boolean> {
throwIfClosed(this);
const result = await this._invoke(RPC.Del, {
transactionId: this.id,
key,
});
return result.ok;
}
async commit(): Promise<CommitTransactionResponse> {
this._closed = true;
return await this._invoke(RPC.CommitTransaction, {
transactionId: this.id,
});
}
}
export interface IndexTransaction extends ReadTransaction {
/**
* 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 thrown.
*/
createIndex(def: CreateIndexDefinition): Promise<void>;
/**
* Drops an index previously created with [[createIndex]].
*/
dropIndex(name: string): Promise<void>;
}
/**
* The definition of an index. This is used with
* [[Replicache.createIndex|createIndex]] when creating indexes.
*/
export interface CreateIndexDefinition {
/** The name of the index. This is used when you [[ReadTransaction.scan|scan]] over an index. */
name: string;
/**
* The prefix, if any, to limit the index over. If not provided the values of
* all keys are indexed.
*/
keyPrefix?: string;
/**
* A [JSON Pointer](https://tools.ietf.org/html/rfc6901) pointing at the sub
* value inside each value to index over.
*
* For example, one might index over users' ages like so:
* `createIndex({name: 'usersByAge', keyPrefix: '/user/', jsonPointer: '/age'})`
*/
jsonPointer: string;
}
export class IndexTransactionImpl
extends ReadTransactionImpl
implements IndexTransaction {
protected readonly _openTransactionName = RPC.OpenIndexTransaction;
async createIndex(options: CreateIndexDefinition): Promise<void> {
throwIfClosed(this);
await this._invoke(RPC.CreateIndex, {
transactionId: this.id,
name: options.name,
keyPrefix: options.keyPrefix || '',
jsonPointer: options.jsonPointer,
});
}
async dropIndex(name: string): Promise<void> {
throwIfClosed(this);
await this._invoke(RPC.DropIndex, {
transactionId: this.id,
name,
});
}
async commit(): Promise<CommitTransactionResponse> {
this._closed = true;
return await this._invoke(RPC.CommitTransaction, {
transactionId: this.id,
});
}
}