804 lines
20 KiB
TypeScript
804 lines
20 KiB
TypeScript
/*
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This file is part of TALER
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(C) 2016 GNUnet e.V.
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TALER is free software; you can redistribute it and/or modify it under the
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terms of the GNU General Public License as published by the Free Software
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Foundation; either version 3, or (at your option) any later version.
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TALER is distributed in the hope that it will be useful, but WITHOUT ANY
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WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
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A PARTICULAR PURPOSE. See the GNU General Public License for more details.
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You should have received a copy of the GNU General Public License along with
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TALER; see the file COPYING. If not, see <http://www.gnu.org/licenses/>
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*/
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/**
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* Database query abstractions.
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* @module Query
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* @author Florian Dold
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*/
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"use strict";
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export interface JoinResult<L,R> {
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left: L;
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right: R;
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}
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export interface JoinLeftResult<L,R> {
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left: L;
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right?: R;
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}
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export class Store<T> {
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name: string;
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validator?: (v: T) => T;
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storeParams?: IDBObjectStoreParameters;
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constructor(name: string, storeParams?: IDBObjectStoreParameters,
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validator?: (v: T) => T) {
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this.name = name;
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this.validator = validator;
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this.storeParams = storeParams;
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}
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}
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export class Index<S extends IDBValidKey,T> {
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indexName: string;
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storeName: string;
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keyPath: string | string[];
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constructor(s: Store<T>, indexName: string, keyPath: string | string[]) {
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this.storeName = s.name;
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this.indexName = indexName;
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this.keyPath = keyPath;
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}
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}
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/**
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* Stream that can be filtered, reduced or joined
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* with indices.
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*/
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export interface QueryStream<T> {
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indexJoin<S,I extends IDBValidKey>(index: Index<I,S>,
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keyFn: (obj: T) => I): QueryStream<JoinResult<T, S>>;
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indexJoinLeft<S,I extends IDBValidKey>(index: Index<I,S>,
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keyFn: (obj: T) => I): QueryStream<JoinLeftResult<T, S>>;
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keyJoin<S,I extends IDBValidKey>(store: Store<S>,
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keyFn: (obj: T) => I): QueryStream<JoinResult<T,S>>;
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filter(f: (T: any) => boolean): QueryStream<T>;
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reduce<S>(f: (v: T, acc: S) => S, start?: S): Promise<S>;
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map<S>(f: (x:T) => S): QueryStream<S>;
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flatMap<S>(f: (x: T) => S[]): QueryStream<S>;
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toArray(): Promise<T[]>;
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first(): QueryValue<T>;
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then(onfulfill: any, onreject: any): any;
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}
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/**
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* Query result that consists of at most one value.
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*/
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export interface QueryValue<T> {
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map<S>(f: (x: T) => S): QueryValue<S>;
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cond<R>(f: (x: T) => boolean, onTrue: (r: QueryRoot) => R, onFalse: (r: QueryRoot) => R): Promise<void>;
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}
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abstract class BaseQueryValue<T> implements QueryValue<T> {
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root: QueryRoot;
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constructor(root: QueryRoot) {
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this.root = root;
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}
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map<S>(f: (x: T) => S): QueryValue<S> {
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return new MapQueryValue<T,S>(this, f);
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}
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cond<R>(f: (x: T) => boolean, onTrue: (r: QueryRoot) => R, onFalse: (r: QueryRoot) => R): Promise<void> {
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return new Promise((resolve, reject) => {
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this.subscribeOne((v, tx) => {
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if (f(v)) {
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onTrue(new QueryRoot(this.root.db));
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} else {
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onFalse(new QueryRoot(this.root.db));
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}
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});
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resolve();
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});
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}
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abstract subscribeOne(f: SubscribeOneFn): void;
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}
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class FirstQueryValue<T> extends BaseQueryValue<T> {
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gotValue = false;
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s: QueryStreamBase<T>;
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constructor(stream: QueryStreamBase<T>) {
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super(stream.root);
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this.s = stream;
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}
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subscribeOne(f: SubscribeOneFn): void {
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this.s.subscribe((isDone, value, tx) => {
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if (this.gotValue) {
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return;
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}
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if (isDone) {
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f(undefined, tx);
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} else {
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f(value, tx);
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}
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this.gotValue = true;
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});
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}
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}
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class MapQueryValue<T,S> extends BaseQueryValue<S> {
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mapFn: (x: T) => S;
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v: BaseQueryValue<T>;
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constructor(v: BaseQueryValue<T>, mapFn: (x: T) => S) {
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super(v.root);
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this.v = v;
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this.mapFn = mapFn;
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}
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subscribeOne(f: SubscribeOneFn): void {
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this.v.subscribeOne((v, tx) => this.mapFn(v));
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}
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}
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export let AbortTransaction = Symbol("abort_transaction");
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/**
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* Get an unresolved promise together with its extracted resolve / reject
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* function.
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*/
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export function openPromise<T>() {
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let resolve: ((value?: T | PromiseLike<T>) => void) | null = null;
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let reject: ((reason?: any) => void) | null = null;
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const promise = new Promise<T>((res, rej) => {
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resolve = res;
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reject = rej;
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});
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if (!(resolve && reject)) {
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// Never happens, unless JS implementation is broken
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throw Error();
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}
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return {resolve, reject, promise};
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}
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abstract class QueryStreamBase<T> implements QueryStream<T>, PromiseLike<void> {
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abstract subscribe(f: (isDone: boolean,
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value: any,
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tx: IDBTransaction) => void): void;
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root: QueryRoot;
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constructor(root: QueryRoot) {
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this.root = root;
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}
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first(): QueryValue<T> {
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return new FirstQueryValue(this);
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}
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then<R>(onfulfilled: (value: void) => R | PromiseLike<R>, onrejected: (reason: any) => R | PromiseLike<R>): PromiseLike<R> {
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return this.root.then(onfulfilled, onrejected);
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}
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flatMap<S>(f: (x: T) => S[]): QueryStream<S> {
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return new QueryStreamFlatMap<T,S>(this, f);
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}
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map<S>(f: (x: T) => S): QueryStream<S> {
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return new QueryStreamMap(this, f);
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}
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indexJoin<S,I extends IDBValidKey>(index: Index<I,S>,
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keyFn: (obj: T) => I): QueryStream<JoinResult<T, S>> {
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this.root.addStoreAccess(index.storeName, false);
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return new QueryStreamIndexJoin(this, index.storeName, index.indexName, keyFn);
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}
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indexJoinLeft<S,I extends IDBValidKey>(index: Index<I,S>,
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keyFn: (obj: T) => I): QueryStream<JoinLeftResult<T, S>> {
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this.root.addStoreAccess(index.storeName, false);
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return new QueryStreamIndexJoinLeft(this, index.storeName, index.indexName, keyFn);
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}
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keyJoin<S, I extends IDBValidKey>(store: Store<S>,
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keyFn: (obj: T) => I): QueryStream<JoinResult<T, S>> {
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this.root.addStoreAccess(store.name, false);
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return new QueryStreamKeyJoin(this, store.name, keyFn);
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}
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filter(f: (x: any) => boolean): QueryStream<T> {
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return new QueryStreamFilter(this, f);
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}
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toArray(): Promise<T[]> {
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let {resolve, promise} = openPromise();
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let values: T[] = [];
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this.subscribe((isDone, value) => {
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if (isDone) {
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resolve(values);
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return;
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}
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values.push(value);
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});
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return Promise.resolve()
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.then(() => this.root.finish())
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.then(() => promise);
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}
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reduce<A>(f: (x: any, acc?: A) => A, init?: A): Promise<any> {
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let {resolve, promise} = openPromise();
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let acc = init;
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this.subscribe((isDone, value) => {
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if (isDone) {
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resolve(acc);
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return;
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}
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acc = f(value, acc);
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});
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return Promise.resolve()
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.then(() => this.root.finish())
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.then(() => promise);
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}
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}
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type FilterFn = (e: any) => boolean;
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type SubscribeFn = (done: boolean, value: any, tx: IDBTransaction) => void;
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type SubscribeOneFn = (value: any, tx: IDBTransaction) => void;
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interface FlatMapFn<T> {
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(v: T): T[];
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}
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class QueryStreamFilter<T> extends QueryStreamBase<T> {
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s: QueryStreamBase<T>;
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filterFn: FilterFn;
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constructor(s: QueryStreamBase<T>, filterFn: FilterFn) {
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super(s.root);
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this.s = s;
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this.filterFn = filterFn;
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}
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subscribe(f: SubscribeFn) {
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this.s.subscribe((isDone, value, tx) => {
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if (isDone) {
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f(true, undefined, tx);
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return;
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}
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if (this.filterFn(value)) {
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f(false, value, tx);
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}
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});
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}
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}
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class QueryStreamFlatMap<T,S> extends QueryStreamBase<S> {
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s: QueryStreamBase<T>;
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flatMapFn: (v: T) => S[];
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constructor(s: QueryStreamBase<T>, flatMapFn: (v: T) => S[]) {
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super(s.root);
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this.s = s;
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this.flatMapFn = flatMapFn;
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}
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subscribe(f: SubscribeFn) {
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this.s.subscribe((isDone, value, tx) => {
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if (isDone) {
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f(true, undefined, tx);
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return;
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}
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let values = this.flatMapFn(value);
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for (let v in values) {
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f(false, value, tx)
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}
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});
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}
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}
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class QueryStreamMap<S,T> extends QueryStreamBase<T> {
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s: QueryStreamBase<S>;
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mapFn: (v: S) => T;
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constructor(s: QueryStreamBase<S>, mapFn: (v: S) => T) {
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super(s.root);
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this.s = s;
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this.mapFn = mapFn;
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}
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subscribe(f: SubscribeFn) {
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this.s.subscribe((isDone, value, tx) => {
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if (isDone) {
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f(true, undefined, tx);
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return;
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}
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let mappedValue = this.mapFn(value);
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f(false, mappedValue, tx);
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});
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}
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}
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class QueryStreamIndexJoin<T, S> extends QueryStreamBase<JoinResult<T, S>> {
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s: QueryStreamBase<T>;
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storeName: string;
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key: any;
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indexName: string;
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constructor(s: QueryStreamBase<T>, storeName: string, indexName: string,
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key: any) {
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super(s.root);
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this.s = s;
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this.storeName = storeName;
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this.key = key;
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this.indexName = indexName;
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}
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subscribe(f: SubscribeFn) {
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this.s.subscribe((isDone, value, tx) => {
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if (isDone) {
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f(true, undefined, tx);
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return;
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}
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let s = tx.objectStore(this.storeName).index(this.indexName);
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let req = s.openCursor(IDBKeyRange.only(this.key(value)));
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req.onsuccess = () => {
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let cursor = req.result;
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if (cursor) {
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f(false, {left: value, right: cursor.value}, tx);
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cursor.continue();
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}
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}
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});
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}
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}
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class QueryStreamIndexJoinLeft<T, S> extends QueryStreamBase<JoinLeftResult<T, S>> {
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s: QueryStreamBase<T>;
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storeName: string;
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key: any;
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indexName: string;
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constructor(s: QueryStreamBase<T>, storeName: string, indexName: string,
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key: any) {
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super(s.root);
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this.s = s;
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this.storeName = storeName;
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this.key = key;
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this.indexName = indexName;
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}
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subscribe(f: SubscribeFn) {
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this.s.subscribe((isDone, value, tx) => {
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if (isDone) {
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f(true, undefined, tx);
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return;
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}
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const s = tx.objectStore(this.storeName).index(this.indexName);
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const req = s.openCursor(IDBKeyRange.only(this.key(value)));
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let gotMatch = false;
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req.onsuccess = () => {
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let cursor = req.result;
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if (cursor) {
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gotMatch = true;
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f(false, {left: value, right: cursor.value}, tx);
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cursor.continue();
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} else {
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if (!gotMatch) {
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f(false, {left: value}, tx);
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}
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}
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}
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});
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}
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}
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class QueryStreamKeyJoin<T, S> extends QueryStreamBase<JoinResult<T, S>> {
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s: QueryStreamBase<T>;
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storeName: string;
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key: any;
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constructor(s: QueryStreamBase<T>, storeName: string,
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key: any) {
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super(s.root);
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this.s = s;
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this.storeName = storeName;
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this.key = key;
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}
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subscribe(f: SubscribeFn) {
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this.s.subscribe((isDone, value, tx) => {
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if (isDone) {
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f(true, undefined, tx);
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return;
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}
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let s = tx.objectStore(this.storeName);
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let req = s.openCursor(IDBKeyRange.only(this.key(value)));
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req.onsuccess = () => {
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let cursor = req.result;
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if (cursor) {
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f(false, {left:value, right: cursor.value}, tx);
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cursor.continue();
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} else {
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f(true, undefined, tx);
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}
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}
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});
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}
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}
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class IterQueryStream<T> extends QueryStreamBase<T> {
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private storeName: string;
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private options: any;
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private subscribers: SubscribeFn[];
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constructor(qr: QueryRoot, storeName: string, options: any) {
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super(qr);
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this.options = options;
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this.storeName = storeName;
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this.subscribers = [];
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let doIt = (tx: IDBTransaction) => {
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const {indexName = void 0, only = void 0} = this.options;
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let s: any;
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if (indexName !== void 0) {
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s = tx.objectStore(this.storeName)
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.index(this.options.indexName);
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} else {
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s = tx.objectStore(this.storeName);
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}
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let kr: IDBKeyRange | undefined = undefined;
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if (only !== undefined) {
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kr = IDBKeyRange.only(this.options.only);
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}
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let req = s.openCursor(kr);
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req.onsuccess = () => {
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let cursor: IDBCursorWithValue = req.result;
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if (cursor) {
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for (let f of this.subscribers) {
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f(false, cursor.value, tx);
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}
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cursor.continue();
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} else {
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for (let f of this.subscribers) {
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f(true, undefined, tx);
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}
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}
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}
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};
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this.root.addWork(doIt);
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}
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subscribe(f: SubscribeFn) {
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this.subscribers.push(f);
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}
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}
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export class QueryRoot implements PromiseLike<void> {
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private work: ((t: IDBTransaction) => void)[] = [];
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db: IDBDatabase;
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private stores = new Set();
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private kickoffPromise: Promise<void>;
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/**
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* Some operations is a write operation,
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* and we need to do a "readwrite" transaction/
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*/
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private hasWrite: boolean;
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private finishScheduled: boolean;
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private finished: boolean = false;
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constructor(db: IDBDatabase) {
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this.db = db;
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}
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then<R>(onfulfilled: (value: void) => R | PromiseLike<R>, onrejected: (reason: any) => R | PromiseLike<R>): PromiseLike<R> {
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return this.finish().then(onfulfilled, onrejected);
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}
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checkFinished() {
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if (this.finished) {
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throw Error("Can't add work to query after it was started");
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}
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}
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iter<T>(store: Store<T>): QueryStream<T> {
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this.checkFinished();
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this.stores.add(store.name);
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this.scheduleFinish();
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return new IterQueryStream(this, store.name, {});
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}
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count<T>(store: Store<T>): Promise<number> {
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this.checkFinished();
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const {resolve, promise} = openPromise();
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const doCount = (tx: IDBTransaction) => {
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const s = tx.objectStore(store.name);
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const req = s.count();
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req.onsuccess = () => {
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resolve(req.result);
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};
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}
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this.addWork(doCount, store.name, false);
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return Promise.resolve()
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.then(() => this.finish())
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.then(() => promise);
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}
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deleteIf<T>(store: Store<T>, predicate: (x: T, n: number) => boolean): QueryRoot {
|
|
this.checkFinished();
|
|
const doDeleteIf = (tx: IDBTransaction) => {
|
|
const s = tx.objectStore(store.name);
|
|
const req = s.openCursor();
|
|
let n = 0;
|
|
req.onsuccess = () => {
|
|
let cursor: IDBCursorWithValue = req.result;
|
|
if (cursor) {
|
|
if (predicate(cursor.value, n++)) {
|
|
cursor.delete();
|
|
}
|
|
cursor.continue();
|
|
}
|
|
}
|
|
};
|
|
this.addWork(doDeleteIf, store.name, true);
|
|
return this;
|
|
}
|
|
|
|
iterIndex<S extends IDBValidKey,T>(index: Index<S,T>,
|
|
only?: S): QueryStream<T> {
|
|
this.checkFinished();
|
|
this.stores.add(index.storeName);
|
|
this.scheduleFinish();
|
|
return new IterQueryStream(this, index.storeName, {
|
|
only,
|
|
indexName: index.indexName
|
|
});
|
|
}
|
|
|
|
/**
|
|
* Put an object into the given object store.
|
|
* Overrides if an existing object with the same key exists
|
|
* in the store.
|
|
*/
|
|
put<T>(store: Store<T>, val: T): QueryRoot {
|
|
this.checkFinished();
|
|
let doPut = (tx: IDBTransaction) => {
|
|
tx.objectStore(store.name).put(val);
|
|
};
|
|
this.scheduleFinish();
|
|
this.addWork(doPut, store.name, true);
|
|
return this;
|
|
}
|
|
|
|
|
|
putWithResult<T>(store: Store<T>, val: T): Promise<IDBValidKey> {
|
|
this.checkFinished();
|
|
const {resolve, promise} = openPromise();
|
|
let doPutWithResult = (tx: IDBTransaction) => {
|
|
let req = tx.objectStore(store.name).put(val);
|
|
req.onsuccess = () => {
|
|
resolve(req.result);
|
|
}
|
|
this.scheduleFinish();
|
|
};
|
|
this.addWork(doPutWithResult, store.name, true);
|
|
return Promise.resolve()
|
|
.then(() => this.finish())
|
|
.then(() => promise);
|
|
}
|
|
|
|
|
|
mutate<T>(store: Store<T>, key: any, f: (v: T) => T): QueryRoot {
|
|
this.checkFinished();
|
|
let doPut = (tx: IDBTransaction) => {
|
|
let reqGet = tx.objectStore(store.name).get(key);
|
|
reqGet.onsuccess = () => {
|
|
let r = reqGet.result;
|
|
let m: T;
|
|
try {
|
|
m = f(r);
|
|
} catch (e) {
|
|
if (e == AbortTransaction) {
|
|
tx.abort();
|
|
return;
|
|
}
|
|
throw e;
|
|
}
|
|
|
|
tx.objectStore(store.name).put(m);
|
|
}
|
|
};
|
|
this.scheduleFinish();
|
|
this.addWork(doPut, store.name, true);
|
|
return this;
|
|
}
|
|
|
|
|
|
/**
|
|
* Add all object from an iterable to the given object store.
|
|
* Fails if the object's key is already present
|
|
* in the object store.
|
|
*/
|
|
putAll<T>(store: Store<T>, iterable: T[]): QueryRoot {
|
|
this.checkFinished();
|
|
const doPutAll = (tx: IDBTransaction) => {
|
|
for (let obj of iterable) {
|
|
tx.objectStore(store.name).put(obj);
|
|
}
|
|
};
|
|
this.scheduleFinish();
|
|
this.addWork(doPutAll, store.name, true);
|
|
return this;
|
|
}
|
|
|
|
/**
|
|
* Add an object to the given object store.
|
|
* Fails if the object's key is already present
|
|
* in the object store.
|
|
*/
|
|
add<T>(store: Store<T>, val: T): QueryRoot {
|
|
this.checkFinished();
|
|
const doAdd = (tx: IDBTransaction) => {
|
|
tx.objectStore(store.name).add(val);
|
|
};
|
|
this.scheduleFinish();
|
|
this.addWork(doAdd, store.name, true);
|
|
return this;
|
|
}
|
|
|
|
/**
|
|
* Get one object from a store by its key.
|
|
*/
|
|
get<T>(store: Store<T>, key: any): Promise<T|undefined> {
|
|
this.checkFinished();
|
|
if (key === void 0) {
|
|
throw Error("key must not be undefined");
|
|
}
|
|
|
|
const {resolve, promise} = openPromise();
|
|
|
|
const doGet = (tx: IDBTransaction) => {
|
|
const req = tx.objectStore(store.name).get(key);
|
|
req.onsuccess = () => {
|
|
resolve(req.result);
|
|
};
|
|
};
|
|
|
|
this.addWork(doGet, store.name, false);
|
|
return Promise.resolve()
|
|
.then(() => this.finish())
|
|
.then(() => promise);
|
|
}
|
|
|
|
/**
|
|
* Get one object from a store by its key.
|
|
*/
|
|
getIndexed<I extends IDBValidKey,T>(index: Index<I,T>,
|
|
key: I): Promise<T|undefined> {
|
|
this.checkFinished();
|
|
if (key === void 0) {
|
|
throw Error("key must not be undefined");
|
|
}
|
|
|
|
const {resolve, promise} = openPromise();
|
|
|
|
const doGetIndexed = (tx: IDBTransaction) => {
|
|
const req = tx.objectStore(index.storeName)
|
|
.index(index.indexName)
|
|
.get(key);
|
|
req.onsuccess = () => {
|
|
resolve(req.result);
|
|
};
|
|
};
|
|
|
|
this.addWork(doGetIndexed, index.storeName, false);
|
|
return Promise.resolve()
|
|
.then(() => this.finish())
|
|
.then(() => promise);
|
|
}
|
|
|
|
private scheduleFinish() {
|
|
if (!this.finishScheduled) {
|
|
Promise.resolve().then(() => this.finish());
|
|
this.finishScheduled = true;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Finish the query, and start the query in the first place if necessary.
|
|
*/
|
|
finish(): Promise<void> {
|
|
if (this.kickoffPromise) {
|
|
return this.kickoffPromise;
|
|
}
|
|
this.kickoffPromise = new Promise<void>((resolve, reject) => {
|
|
// At this point, we can't add any more work
|
|
this.finished = true;
|
|
if (this.work.length == 0) {
|
|
resolve();
|
|
return;
|
|
}
|
|
const mode = this.hasWrite ? "readwrite" : "readonly";
|
|
const tx = this.db.transaction(Array.from(this.stores), mode);
|
|
tx.oncomplete = () => {
|
|
resolve();
|
|
};
|
|
tx.onabort = () => {
|
|
reject(Error("transaction aborted"));
|
|
};
|
|
for (let w of this.work) {
|
|
w(tx);
|
|
}
|
|
});
|
|
return this.kickoffPromise;
|
|
}
|
|
|
|
/**
|
|
* Delete an object by from the given object store.
|
|
*/
|
|
delete(storeName: string, key: any): QueryRoot {
|
|
this.checkFinished();
|
|
const doDelete = (tx: IDBTransaction) => {
|
|
tx.objectStore(storeName).delete(key);
|
|
};
|
|
this.scheduleFinish();
|
|
this.addWork(doDelete, storeName, true);
|
|
return this;
|
|
}
|
|
|
|
/**
|
|
* Low-level function to add a task to the internal work queue.
|
|
*/
|
|
addWork(workFn: (t: IDBTransaction) => void,
|
|
storeName?: string,
|
|
isWrite?: boolean) {
|
|
this.work.push(workFn);
|
|
if (storeName) {
|
|
this.addStoreAccess(storeName, isWrite);
|
|
}
|
|
}
|
|
|
|
addStoreAccess(storeName: string, isWrite?: boolean) {
|
|
if (storeName) {
|
|
this.stores.add(storeName);
|
|
}
|
|
if (isWrite) {
|
|
this.hasWrite = true;
|
|
}
|
|
}
|
|
}
|